diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..248ba7b3e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.idea
+.DS_Store
+app/.env
+app/vendor
+app/logs
\ No newline at end of file
diff --git a/Readme.md b/Readme.md
new file mode 100644
index 000000000..61108a03e
--- /dev/null
+++ b/Readme.md
@@ -0,0 +1,19 @@
+**Как использовать**
+
+1)зайти в контейнер php-fpm через команду  docker-compose exec php-fpm bash
+2)зайти в директорию public
+3)запустить скрипт через команду php index.php
+
+index.php принимает параметры
+
+- analyze (id youtube каналов через запятую)
+- statistics (id канала для получения статистики)
+- top_n (получить топ n каналов по соотношению likes/dislikes);
+
+Пример:
+
+php index.php analyze UCMcDsSeqS531-HKz6GiJgtA,UC2QJf0YXCH57FR588wQIaSg
+
+php index.php statistics UCMcDsSeqS531-HKz6GiJgtA
+
+php index.php ton_n 3
diff --git a/app/.env.example b/app/.env.example
new file mode 100644
index 000000000..9a84fb11e
--- /dev/null
+++ b/app/.env.example
@@ -0,0 +1,17 @@
+YOUTUBE_API_KEY=API_KEY
+YOUTUBE_CLIENT_ID=CLIENT_ID
+YOUTUBE_CLIENT_SECRET=CLIENT_SECRET
+
+#no_sql can be => ElasticSearch, MongoDB
+NO_SQL_DB='ElasticSearch'
+
+ELASTIC_SEARCH_HOST=elastic-search
+ELASTIC_SEARCH_PORT=9200
+
+VIDEOPLATFORM=youtube
+
+MONGODB_HOST=mongo-db
+MONGODB_PORT=27017
+MONGODB_USERNAME=root
+MONGODB_PASSWORD=root
+MONGODB_DATABASE=otus
\ No newline at end of file
diff --git a/app/bootstrap/bootstrap.php b/app/bootstrap/bootstrap.php
new file mode 100644
index 000000000..71ae83df1
--- /dev/null
+++ b/app/bootstrap/bootstrap.php
@@ -0,0 +1,6 @@
+<?php
+
+require_once '../vendor/autoload.php';
+
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__ . '/..');
+$dotenv->load();
diff --git a/app/composer.json b/app/composer.json
new file mode 100644
index 000000000..ba4bfaaae
--- /dev/null
+++ b/app/composer.json
@@ -0,0 +1,25 @@
+{
+    "name": "rsm/app",
+    "description": "hw-otus",
+    "type": "project",
+    "authors": [
+        {
+            "name": "yessaliyev",
+            "email": "40271311+yessaliyev@users.noreply.github.com"
+        }
+    ],
+    "minimum-stability": "dev",
+    "require": {
+        "google/apiclient": "^2.0",
+        "vlucas/phpdotenv": "^5.2@dev",
+        "guzzlehttp/guzzle": "^7.1@dev",
+        "elasticsearch/elasticsearch": "dev-master",
+        "mongodb/mongodb": "1.9.x-dev",
+        "monolog/monolog": "2.x-dev"
+    },
+    "autoload": {
+        "psr-4": {
+            "VideoPlatform\\": "src/hw"
+        }
+    }
+}
diff --git a/app/composer.lock b/app/composer.lock
new file mode 100644
index 000000000..92b730fcd
--- /dev/null
+++ b/app/composer.lock
@@ -0,0 +1,1854 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "c34491169215ad26f5054e992b7f2ff8",
+    "packages": [
+        {
+            "name": "composer/package-versions-deprecated",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/package-versions-deprecated.git",
+                "reference": "f921205948ab93bb19f86327c793a81edb62f236"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/package-versions-deprecated/zipball/f921205948ab93bb19f86327c793a81edb62f236",
+                "reference": "f921205948ab93bb19f86327c793a81edb62f236",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1.1.0 || ^2.0",
+                "php": "^7 || ^8"
+            },
+            "replace": {
+                "ocramius/package-versions": "1.11.99"
+            },
+            "require-dev": {
+                "composer/composer": "^1.9.3 || ^2.0@dev",
+                "ext-zip": "^1.13",
+                "phpunit/phpunit": "^6.5 || ^7"
+            },
+            "default-branch": true,
+            "type": "composer-plugin",
+            "extra": {
+                "class": "PackageVersions\\Installer",
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PackageVersions\\": "src/PackageVersions"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be"
+                }
+            ],
+            "description": "Composer plugin that provides efficient querying for installed package versions (no runtime IO)",
+            "support": {
+                "issues": "https://github.com/composer/package-versions-deprecated/issues",
+                "source": "https://github.com/composer/package-versions-deprecated/tree/master"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-12-27T20:11:05+00:00"
+        },
+        {
+            "name": "elasticsearch/elasticsearch",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/elastic/elasticsearch-php.git",
+                "reference": "0d80e531bd3d321bd1011127e917e771002c76ac"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/elastic/elasticsearch-php/zipball/0d80e531bd3d321bd1011127e917e771002c76ac",
+                "reference": "0d80e531bd3d321bd1011127e917e771002c76ac",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": ">=1.3.7",
+                "ezimuel/ringphp": "^1.1.2",
+                "php": "^7.1",
+                "psr/log": "~1.0"
+            },
+            "require-dev": {
+                "cpliakas/git-wrapper": "~2.0",
+                "doctrine/inflector": "^1.3",
+                "mockery/mockery": "^1.2",
+                "phpstan/phpstan": "^0.12",
+                "phpunit/phpunit": "^7.5",
+                "squizlabs/php_codesniffer": "^3.4",
+                "symfony/finder": "~4.0",
+                "symfony/yaml": "~4.0"
+            },
+            "suggest": {
+                "ext-curl": "*",
+                "monolog/monolog": "Allows for client-level logging and tracing"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/autoload.php"
+                ],
+                "psr-4": {
+                    "Elasticsearch\\": "src/Elasticsearch/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "authors": [
+                {
+                    "name": "Zachary Tong"
+                },
+                {
+                    "name": "Enrico Zimuel"
+                }
+            ],
+            "description": "PHP Client for Elasticsearch",
+            "keywords": [
+                "client",
+                "elasticsearch",
+                "search"
+            ],
+            "time": "2020-12-17T22:07:25+00:00"
+        },
+        {
+            "name": "ezimuel/guzzlestreams",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ezimuel/guzzlestreams.git",
+                "reference": "abe3791d231167f14eb80d413420d1eab91163a8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ezimuel/guzzlestreams/zipball/abe3791d231167f14eb80d413420d1eab91163a8",
+                "reference": "abe3791d231167f14eb80d413420d1eab91163a8",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Stream\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
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+            "authors": [
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+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Fork of guzzle/streams (abandoned) to be used with elasticsearch-php",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "Guzzle",
+                "stream"
+            ],
+            "time": "2020-02-14T23:11:50+00:00"
+        },
+        {
+            "name": "ezimuel/ringphp",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ezimuel/ringphp.git",
+                "reference": "0b78f89d8e0bb9e380046c31adfa40347e9f663b"
+            },
+            "dist": {
+                "type": "zip",
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+                "shasum": ""
+            },
+            "require": {
+                "ezimuel/guzzlestreams": "^3.0.1",
+                "php": ">=5.4.0",
+                "react/promise": "~2.0"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "phpunit/phpunit": "~4.0"
+            },
+            "suggest": {
+                "ext-curl": "Guzzle will use specific adapters if cURL is present"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Ring\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Fork of guzzle/RingPHP (abandoned) to be used with elasticsearch-php",
+            "time": "2020-02-14T23:51:21+00:00"
+        },
+        {
+            "name": "firebase/php-jwt",
+            "version": "v5.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/firebase/php-jwt.git",
+                "reference": "feb0e820b8436873675fd3aca04f3728eb2185cb"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/feb0e820b8436873675fd3aca04f3728eb2185cb",
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": ">=4.8 <=9"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Firebase\\JWT\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Neuman Vong",
+                    "email": "neuman+pear@twilio.com",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Anant Narayanan",
+                    "email": "anant@php.net",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A simple library to encode and decode JSON Web Tokens (JWT) in PHP. Should conform to the current spec.",
+            "homepage": "https://github.com/firebase/php-jwt",
+            "keywords": [
+                "jwt",
+                "php"
+            ],
+            "time": "2020-03-25T18:49:23+00:00"
+        },
+        {
+            "name": "google/apiclient",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/googleapis/google-api-php-client.git",
+                "reference": "e0753f9fb61e514b821108fcde665a10e1cce51c"
+            },
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+            },
+            "require": {
+                "firebase/php-jwt": "~2.0||~3.0||~4.0||~5.0",
+                "google/apiclient-services": "~0.13",
+                "google/auth": "^1.10",
+                "guzzlehttp/guzzle": "~5.3.3||~6.0||~7.0",
+                "guzzlehttp/psr7": "^1.2",
+                "monolog/monolog": "^1.17|^2.0",
+                "php": "^5.6|^7.0|^8.0",
+                "phpseclib/phpseclib": "~2.0||^3.0.2"
+            },
+            "require-dev": {
+                "cache/filesystem-adapter": "^0.3.2|^1.1",
+                "composer/composer": "^1.10",
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
+                "phpcompatibility/php-compatibility": "^9.2",
+                "phpunit/phpunit": "^5.7||^8.5.13",
+                "squizlabs/php_codesniffer": "~2.3",
+                "symfony/css-selector": "~2.1",
+                "symfony/dom-crawler": "~2.1"
+            },
+            "suggest": {
+                "cache/filesystem-adapter": "For caching certs and tokens (using Google\\Client::setCache)"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Google\\": "src/"
+                },
+                "files": [
+                    "src/aliases.php"
+                ],
+                "classmap": [
+                    "src/aliases.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "description": "Client library for Google APIs",
+            "homepage": "http://developers.google.com/api-client-library/php",
+            "keywords": [
+                "google"
+            ],
+            "time": "2020-12-28T18:40:46+00:00"
+        },
+        {
+            "name": "google/apiclient-services",
+            "version": "v0.156",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/googleapis/google-api-php-client-services.git",
+                "reference": "2f5e54fdef034f856208328126bddd8376dae4b3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/googleapis/google-api-php-client-services/zipball/2f5e54fdef034f856208328126bddd8376dae4b3",
+                "reference": "2f5e54fdef034f856208328126bddd8376dae4b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8|^5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Google_Service_": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "description": "Client library for Google APIs",
+            "homepage": "http://developers.google.com/api-client-library/php",
+            "keywords": [
+                "google"
+            ],
+            "time": "2020-11-30T20:03:55+00:00"
+        },
+        {
+            "name": "google/auth",
+            "version": "v1.14.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/googleapis/google-auth-library-php.git",
+                "reference": "c1503299c779af0cbc99b43788f75930988852cf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/googleapis/google-auth-library-php/zipball/c1503299c779af0cbc99b43788f75930988852cf",
+                "reference": "c1503299c779af0cbc99b43788f75930988852cf",
+                "shasum": ""
+            },
+            "require": {
+                "firebase/php-jwt": "~2.0|~3.0|~4.0|~5.0",
+                "guzzlehttp/guzzle": "^5.3.1|^6.2.1|^7.0",
+                "guzzlehttp/psr7": "^1.2",
+                "php": ">=5.4",
+                "psr/cache": "^1.0",
+                "psr/http-message": "^1.0"
+            },
+            "require-dev": {
+                "guzzlehttp/promises": "0.1.1|^1.3",
+                "kelvinmo/simplejwt": "^0.2.5",
+                "phpseclib/phpseclib": "^2",
+                "phpunit/phpunit": "^4.8.36|^5.7",
+                "sebastian/comparator": ">=1.2.3",
+                "squizlabs/php_codesniffer": "^3.5"
+            },
+            "suggest": {
+                "phpseclib/phpseclib": "May be used in place of OpenSSL for signing strings or for token management. Please require version ^2."
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Google\\Auth\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "description": "Google Auth Library for PHP",
+            "homepage": "http://github.com/google/google-auth-library-php",
+            "keywords": [
+                "Authentication",
+                "google",
+                "oauth2"
+            ],
+            "time": "2020-10-16T21:33:48+00:00"
+        },
+        {
+            "name": "graham-campbell/result-type",
+            "version": "1.0.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/GrahamCampbell/Result-Type.git",
+                "reference": "74acfe25f0019fb8af8b5b1eda0681e8e253fee2"
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+                "reference": "74acfe25f0019fb8af8b5b1eda0681e8e253fee2",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0 || ^8.0",
+                "phpoption/phpoption": "^1.7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.7"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "GrahamCampbell\\ResultType\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com"
+                }
+            ],
+            "description": "An Implementation Of The Result Type",
+            "keywords": [
+                "Graham Campbell",
+                "GrahamCampbell",
+                "Result Type",
+                "Result-Type",
+                "result"
+            ],
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/graham-campbell/result-type",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-28T23:32:07+00:00"
+        },
+        {
+            "name": "guzzlehttp/guzzle",
+            "version": "7.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79"
+            },
+            "dist": {
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+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
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+                    "email": "petrich@tronic-media.com",
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+            "notification-url": "https://packagist.org/downloads/",
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+                }
+            ],
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+            "homepage": "https://github.com/php-fig/http-client",
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+        },
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+                }
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+        },
+        {
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+            "source": {
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+            },
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+                },
+                "files": [
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+                ]
+            },
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+                    "name": "Jan Sorgalla",
+                    "email": "jsorgalla@gmail.com"
+                }
+            ],
+            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
+            "keywords": [
+                "promise",
+                "promises"
+            ],
+            "funding": [
+                {
+                    "url": "https://github.com/WyriHaximus",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/cboden",
+                    "type": "github"
+                },
+                {
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+                },
+                {
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+                    "type": "github"
+                }
+            ],
+            "time": "2020-07-23T20:41:09+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "dev-main",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
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+            },
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+            },
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+                },
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+            },
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+                "psr-4": {
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+                },
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
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+                    "email": "BackEndTea@gmail.com"
+                },
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+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
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+                "polyfill",
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+            ],
+            "funding": [
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+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-01-07T16:49:33+00:00"
+        },
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+            "name": "symfony/polyfill-mbstring",
+            "version": "dev-main",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
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+            },
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+                },
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+                }
+            },
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+                ]
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+                },
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+                    "url": "https://github.com/symfony/polyfill"
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+                    "Symfony\\Polyfill\\Php80\\": ""
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+                ]
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+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
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+            ],
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+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
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+                    "url": "https://symfony.com/sponsor",
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+                },
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+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-01-07T16:49:33+00:00"
+        },
+        {
+            "name": "vlucas/phpdotenv",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vlucas/phpdotenv.git",
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+                "shasum": ""
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+            "require": {
+                "ext-pcre": "*",
+                "graham-campbell/result-type": "^1.0.1",
+                "php": "^7.1.3 || ^8.0",
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+                "symfony/polyfill-ctype": "^1.17",
+                "symfony/polyfill-mbstring": "^1.17",
+                "symfony/polyfill-php80": "^1.17"
+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "ext-filter": "*",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.8 || ^9.4"
+            },
+            "suggest": {
+                "ext-filter": "Required to use the boolean validator."
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Dotenv\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
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+                "BSD-3-Clause"
+            ],
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+                {
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com",
+                    "homepage": "https://gjcampbell.co.uk/"
+                },
+                {
+                    "name": "Vance Lucas",
+                    "email": "vance@vancelucas.com",
+                    "homepage": "https://vancelucas.com/"
+                }
+            ],
+            "description": "Loads environment variables from `.env` to `getenv()`, `$_ENV` and `$_SERVER` automagically.",
+            "keywords": [
+                "dotenv",
+                "env",
+                "environment"
+            ],
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+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/vlucas/phpdotenv",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-12-03T22:44:43+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "dev",
+    "stability-flags": {
+        "vlucas/phpdotenv": 20,
+        "guzzlehttp/guzzle": 20,
+        "elasticsearch/elasticsearch": 20,
+        "mongodb/mongodb": 20,
+        "monolog/monolog": 20
+    },
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
+}
diff --git a/app/public/index.php b/app/public/index.php
new file mode 100644
index 000000000..c011f8984
--- /dev/null
+++ b/app/public/index.php
@@ -0,0 +1,11 @@
+<?php
+require_once '../bootstrap/bootstrap.php';
+
+use VideoPlatform\App;
+
+try {
+    $app = new App();
+    $app->run();
+} catch (\Exception $e) {
+    echo $e->getMessage();
+}
diff --git a/app/src/hw/App.php b/app/src/hw/App.php
new file mode 100644
index 000000000..ad6999c37
--- /dev/null
+++ b/app/src/hw/App.php
@@ -0,0 +1,36 @@
+<?php
+namespace VideoPlatform;
+
+use Exception;
+use VideoPlatform\exceptions\AppException;
+use VideoPlatform\interfaces\VideoSharingServiceInterface;
+use VideoPlatform\services\YoutubeService;
+
+class App
+{
+    /**
+     * @throws Exception
+     */
+    public function run()
+    {
+        if (php_sapi_name() !== 'cli') {
+            throw new AppException('need to run in cli mode');
+        }
+
+        $platform = new VideoPlatform($this->getService());
+        $platform->run();
+    }
+
+    /**
+     * @throws Exception
+     */
+    private function getService(): VideoSharingServiceInterface
+    {
+        switch ($_ENV['VIDEOPLATFORM']) {
+            case YoutubeService::PLATFORM_NAME:
+                return new YoutubeService();
+            default:
+                throw new AppException('undefined video platform');
+        }
+    }
+}
diff --git a/app/src/hw/DB/ElasticSearch.php b/app/src/hw/DB/ElasticSearch.php
new file mode 100644
index 000000000..0266392c0
--- /dev/null
+++ b/app/src/hw/DB/ElasticSearch.php
@@ -0,0 +1,124 @@
+<?php
+
+namespace VideoPlatform\DB;
+
+use Elasticsearch\Client;
+use Elasticsearch\ClientBuilder;
+use Exception;
+use Monolog\Logger;
+use VideoPlatform\helpers\ArrayHelper;
+use VideoPlatform\interfaces\DBInterface;
+use VideoPlatform\loggers\AppLogger;
+
+class ElasticSearch implements DBInterface
+{
+    private Client $client;
+
+    public function __construct()
+    {
+        $this->client = ClientBuilder::create()
+            ->setHosts([$_ENV['ELASTIC_SEARCH_HOST']])
+            ->build();
+    }
+
+    /**
+     * @param array $data
+     * @return mixed
+     * @throws Exception
+     */
+    public function save(array $data)
+    {
+        $correctData = ArrayHelper::getCorrectFormat($this, $data);
+
+        $result = $this->client->index($correctData);
+
+        if ($result) {
+            return $result['_id'];
+        }
+
+        return false;
+    }
+
+    /**
+     * @param $index
+     * @param $id
+     * @return array
+     * @throws Exception
+     */
+    public function findById($index, $id): array
+    {
+        $params = [
+            'index' => $index,
+            'id' => $id,
+            'client' => [ 'ignore' => 404 ]
+        ];
+
+        $result = $this->client->get($params);
+
+        if (false === $result['found']) {
+            throw new Exception('Not found');
+        }
+
+        return $result['_source'];
+    }
+
+    /**
+     * @param $index
+     * @param $queryParams
+     * example:
+     * [
+     *  'where' => ['channelId' => 'someId']',
+     *  'limit' => 100,
+     *  'offset' => 0
+     * ]
+     * @return array|callable
+     * @throws Exception
+     */
+    public function query($index, $queryParams = [])
+    {
+        $params = [
+            'index' => $index,
+            'body' => [
+                'query' => [
+                    'match' => $queryParams['where']
+                ]
+            ],
+            'size' => $queryParams['limit'],
+            'from' => $queryParams['offset'],
+            'client' => [ 'ignore' => 404 ]
+        ];
+
+        $result = $this->client->search($params);
+
+        if (empty($response['hits']['hits'])) {
+            AppLogger::addLog(Logger::WARNING,'not found by query', $params);
+        }
+
+        return $result;
+    }
+
+    /**
+     * получает все записи, по лимиту и офсету
+     * @param $index
+     * @param $limit
+     * @param $offset
+     * @return array|callable
+     */
+    public function getAll($index, $limit, $offset)
+    {
+        $params = [
+            'index' => $index,
+            'size' => $limit,
+            'from' => $offset,
+            'client' => [ 'ignore' => 404 ]
+        ];
+
+        $result = $this->client->search($params);
+
+        if (empty($response['hits']['hits'])) {
+            AppLogger::addLog(Logger::WARNING, 'not found by index: ' . $index, $params);
+        }
+
+        return $result;
+    }
+}
\ No newline at end of file
diff --git a/app/src/hw/DB/MongoDB.php b/app/src/hw/DB/MongoDB.php
new file mode 100644
index 000000000..67b2353f6
--- /dev/null
+++ b/app/src/hw/DB/MongoDB.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace VideoPlatform\DB;
+
+use MongoDB\Client;
+use MongoDB\Database;
+use VideoPlatform\interfaces\DBInterface;
+
+/**
+ *
+ * не стал доводить этот класс до конца.
+ * нужно было убедиться что замена no_sql работатет корректно
+ *
+ * Class MongoDB
+ * @package VideoPlatform\DB
+ */
+class MongoDB implements DBInterface
+{
+    private Client $client;
+
+    public function __construct()
+    {
+        $options = ['username' => $_ENV['MONGODB_USERNAME'], 'password' => $_ENV['MONGODB_PASSWORD']];
+        $this->client = new Client('mongodb://' . $_ENV['MONGODB_HOST'] . ':' . $_ENV['MONGODB_PORT'], $options);
+        $this->client->selectDatabase($_ENV['MONGODB_DATABASE']);
+    }
+
+    public function save(array $data): bool
+    {
+        $collection = $this->client->otus->{$data['tableName']};
+
+        $result = $collection->insertOne($data);
+
+        if ($result) {
+            return true;
+        }
+
+        return  false;
+    }
+
+    public function findById($tableName, $id): array
+    {
+        return [];
+    }
+
+    public function query($tableName, $queryParams)
+    {
+        return [];
+    }
+
+    public function getAll($tableName, $limit, $offset)
+    {
+       return [];
+    }
+}
diff --git a/app/src/hw/VideoPlatform.php b/app/src/hw/VideoPlatform.php
new file mode 100644
index 000000000..9120f513a
--- /dev/null
+++ b/app/src/hw/VideoPlatform.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace VideoPlatform;
+
+use Exception;
+use VideoPlatform\exceptions\AppException;
+use VideoPlatform\interfaces\VideoSharingServiceInterface;
+
+class VideoPlatform
+{
+    private const ANALYZE    = 'analyze';
+    private const STATISTICS = 'statistics';
+    private const TOP_N      = 'top_n';
+
+    private VideoSharingServiceInterface $service;
+
+    public function __construct(VideoSharingServiceInterface $service)
+    {
+        $this->service = $service;
+    }
+
+    /**
+     * анализ канала
+     *  - данные о канале
+     *  - данные о видео этого канала
+     * сохраняет в noSql хранилище
+     *
+     * @return mixed
+     * @throws Exception
+     */
+    public function analyze()
+    {
+        $this->validateParam();
+        return $this->service->analyze();
+    }
+
+    /**
+     * Вернет статистику канала. А именно:
+     * [
+     *  'totalLikes' => 123,
+     *  'totalDislikes' => 12,
+     * ]
+     * @return mixed
+     * @throws Exception
+     */
+    public function getStatistics()
+    {
+        $this->validateParam();
+        return $this->service->getStatistics();
+    }
+
+    /**
+     * Топ N каналов по соотношению totalLikes/Dislikes
+     * N - передается как параметр и находится в $_SERVER[argv]
+     *
+     * @return mixed
+     */
+    public function getTopChannels()
+    {
+        return $this->service->getTopChannels();
+    }
+
+    /**
+     * @throws Exception
+     */
+    public function run()
+    {
+        switch ($_SERVER['argv'][1]) {
+            case self::ANALYZE:
+                $result = $this->analyze();
+                break;
+            case self::STATISTICS:
+                $result = $this->getStatistics();
+                break;
+            case self::TOP_N:
+                $result = $this->getTopChannels();
+                break;
+            default:
+                throw new Exception(
+                    'Необходимо передать тип: php index.php [' . self::ANALYZE . '|' . self::STATISTICS . '|' . self::TOP_N . ']'
+                );
+        }
+
+        print_r($result);
+    }
+
+    /**
+     * @param $id
+     * @return
+     */
+    public function findChannelById($id)
+    {
+        return $this->service->findChannelById($id);
+    }
+
+    /**
+     * @throws Exception
+     */
+    private function validateParam()
+    {
+        if (empty($_SERVER['argv'][2])) {
+            throw new AppException("необходимо передать id каналов через запятую. Пример: php index.php analyze|statistics id1,id2,id3 \n");
+        }
+
+        return true;
+    }
+}
diff --git a/app/src/hw/exceptions/AppException.php b/app/src/hw/exceptions/AppException.php
new file mode 100644
index 000000000..20421fa71
--- /dev/null
+++ b/app/src/hw/exceptions/AppException.php
@@ -0,0 +1,16 @@
+<?php
+namespace VideoPlatform\exceptions;
+
+use Exception;
+use Monolog\Logger;
+use Throwable;
+use VideoPlatform\loggers\AppLogger;
+
+class AppException extends Exception
+{
+    public function __construct(string $message = "", int $code = 0, Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+        AppLogger::addLog(Logger::ERROR,$message);
+    }
+}
\ No newline at end of file
diff --git a/app/src/hw/helpers/ArrayHelper.php b/app/src/hw/helpers/ArrayHelper.php
new file mode 100644
index 000000000..20a6fdbf7
--- /dev/null
+++ b/app/src/hw/helpers/ArrayHelper.php
@@ -0,0 +1,77 @@
+<?php
+namespace VideoPlatform\helpers;
+
+use VideoPlatform\interfaces\DBInterface;
+
+class ArrayHelper
+{
+    /**
+     * @param DBInterface $db
+     * @param array $data
+     * @return array
+     * @throws \Exception
+     */
+    public static function getCorrectFormat(DBInterface $db, array $data)
+    {
+        $dbName = $_ENV['NO_SQL_DB'];
+
+        switch ($dbName){
+            case $db::MONGO_DB:
+                return self::formatForMongoDB($data);
+            case $db::ELASTIC_SEARCH:
+                return self::formatForES($data);
+            default:
+                throw new \Exception('invalid type of DB');
+        }
+    }
+
+    private static function formatForMongoDB(array $data)
+    {
+        return $data;
+    }
+
+    /*
+     * попытался сделать так чтобы структура не зависила от модели
+     */
+    private static function formatForES(array $data)
+    {
+        return [
+            'index' => $data['tableName'],
+            'id' => $data['id'],
+            'body' => $data
+        ];
+    }
+
+    /**
+     * @param $data
+     * @param $index
+     * @return array|bool
+     */
+    public static function index($data, $index)
+    {
+        foreach ($data as $key => $value) {
+            if ($key === $index) {
+                return [
+                    $value => $data
+                ];
+            }
+        }
+
+        return false;
+    }
+
+    public static function getColumn(array $array, string $column): array
+    {
+        $result = [];
+
+        foreach ($array as $item) {
+            foreach ($item as $key => $value) {
+                if ($key == $column) {
+                    $result[] = $value;
+                }
+            }
+        }
+
+        return $result;
+    }
+}
diff --git a/app/src/hw/interfaces/DBInterface.php b/app/src/hw/interfaces/DBInterface.php
new file mode 100644
index 000000000..5e7e88628
--- /dev/null
+++ b/app/src/hw/interfaces/DBInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace VideoPlatform\interfaces;
+
+interface DBInterface
+{
+    const ELASTIC_SEARCH = 'ElasticSearch';
+    const MONGO_DB = 'MongoDB';
+
+    public function save(array $data);
+
+    public function  findById($tableName, $id): array;
+
+    public function query($tableName, $queryParams);
+
+    public function getAll($tableName, $limit, $offset);
+}
diff --git a/app/src/hw/interfaces/VideoSharingServiceInterface.php b/app/src/hw/interfaces/VideoSharingServiceInterface.php
new file mode 100644
index 000000000..a9df70280
--- /dev/null
+++ b/app/src/hw/interfaces/VideoSharingServiceInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace VideoPlatform\interfaces;
+
+interface VideoSharingServiceInterface
+{
+    public function analyze();
+    public function getStatistics();
+    public function getTopChannels();
+}
\ No newline at end of file
diff --git a/app/src/hw/loggers/AppLogger.php b/app/src/hw/loggers/AppLogger.php
new file mode 100644
index 000000000..c05941cd8
--- /dev/null
+++ b/app/src/hw/loggers/AppLogger.php
@@ -0,0 +1,15 @@
+<?php
+namespace VideoPlatform\loggers;
+
+use Monolog\Handler\StreamHandler;
+use Monolog\Logger;
+
+class AppLogger
+{
+    public static function addLog($level, string $message, array $context = [])
+    {
+        $log = new Logger('app');
+        $log->pushHandler(new StreamHandler('../logs/app.log'));
+        $log->addRecord($level, $message, $context);
+    }
+}
\ No newline at end of file
diff --git a/app/src/hw/models/ActiveRecord.php b/app/src/hw/models/ActiveRecord.php
new file mode 100644
index 000000000..7738cc8e2
--- /dev/null
+++ b/app/src/hw/models/ActiveRecord.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace VideoPlatform\models;
+
+use VideoPlatform\interfaces\DBInterface;
+
+abstract class ActiveRecord
+{
+    abstract public static function findById(DBInterface $db, $id);
+    abstract public function save(DBInterface $db);
+    abstract public static function getAll(DBInterface $db, $limit, $offset);
+}
\ No newline at end of file
diff --git a/app/src/hw/models/ObjectWatcher.php b/app/src/hw/models/ObjectWatcher.php
new file mode 100644
index 000000000..c83f9ddad
--- /dev/null
+++ b/app/src/hw/models/ObjectWatcher.php
@@ -0,0 +1,60 @@
+<?php
+
+
+namespace VideoPlatform\models;
+
+
+class ObjectWatcher
+{
+    /**
+     * Current instance of ObjectWatcher
+     * @var ObjectWatcher
+     */
+    private static ObjectWatcher $_instance;
+
+    /**
+     * Array of objects to work with.
+     * @var array
+     */
+    private $objects = array();
+
+    /**
+     * Geting instance of ObjectWatcher.
+     * @return ObjectWatcher
+     */
+    public static function getInstance(){
+        if(!isset(self::$_instance)){
+            self::$_instance = new ObjectWatcher;
+        }
+        return self::$_instance;
+    }
+
+    /**
+     * Getting instance of the object existing in the current application.
+     * @param string $className
+     * @param int $id
+     * @return mixed null or object of the class $className with an id = $id if it exists.
+     */
+    public static function getRecord($className, $id) {
+        $inst = self::getInstance();
+        $key = "$className.$id";
+        if(isset($inst->objects[$key])){
+            return $inst->objects[$key];
+        }
+        return null;
+    }
+
+    /**
+     * Adding object to ObjectWatcher registry.
+     * @param $obj
+     *	@param int $id
+     */
+    public static function addRecord($obj, $id) {
+        $inst = self::getInstance();
+        $inst->objects[$inst->getKey($obj, $id)] = $obj;
+    }
+
+    function getKey($obj, $id){
+        return get_class($obj).'.'.$id;
+    }
+}
diff --git a/app/src/hw/models/youtube/Channel.php b/app/src/hw/models/youtube/Channel.php
new file mode 100644
index 000000000..ce416c5b4
--- /dev/null
+++ b/app/src/hw/models/youtube/Channel.php
@@ -0,0 +1,190 @@
+<?php
+
+namespace VideoPlatform\models\youtube;
+
+use VideoPlatform\interfaces\DBInterface;
+use VideoPlatform\models\ActiveRecord;
+use VideoPlatform\models\ObjectWatcher;
+
+class Channel extends ActiveRecord
+{
+    private $id;
+    private $title;
+    private $description;
+    private $viewCount;
+    private $subscriberCount;
+    private $videoCount;
+
+    /**
+     * название таблицы или индекса
+     * @var string $table
+     */
+    private string $tableName = 'channels';
+
+    /**
+     * @return mixed
+     */
+    public function getTableName()
+    {
+        return $this->tableName;
+    }
+
+    /**
+     * @param mixed $id
+     */
+    public function setId($id): void
+    {
+        $this->id = $id;
+    }
+
+    /**
+     * @param mixed $title
+     */
+    public function setTitle($title): void
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * @param mixed $description
+     */
+    public function setDescription($description): void
+    {
+        $this->description = $description;
+    }
+
+    /**
+     * @param mixed $viewCount
+     */
+    public function setViewCount($viewCount): void
+    {
+        $this->viewCount = $viewCount;
+    }
+
+    /**
+     * @param mixed $subscriberCount
+     */
+    public function setSubscriberCount($subscriberCount): void
+    {
+        $this->subscriberCount = $subscriberCount;
+    }
+
+    /**
+     * @param mixed $videoCount
+     */
+    public function setVideoCount($videoCount): void
+    {
+        $this->videoCount = $videoCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getDescription()
+    {
+        return $this->description;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getSubscriberCount()
+    {
+        return $this->subscriberCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getVideoCount()
+    {
+        return $this->videoCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getViewCount()
+    {
+        return $this->viewCount;
+    }
+
+    /**
+     * @param DBInterface $db
+     * @param $id
+     * @return Channel
+     */
+    public static function findById(DBInterface $db, $id): self
+    {
+        $result = $db->findById((new self())->tableName, $id);
+
+        $identityMap = ObjectWatcher::getRecord(self::class, $id);
+
+        if ($identityMap) {
+            return  $identityMap;
+        }
+
+        $channel = new self();
+        $channel->setId($result['id']);
+        $channel->setDescription($result['description']);
+        $channel->setSubscriberCount($result['subscriberCount']);
+        $channel->setTitle($result['title']);
+        $channel->setVideoCount($result['videoCount']);
+        $channel->setViewCount($result['viewCount']);
+
+        ObjectWatcher::addRecord($channel, $channel->getId());
+
+        return $channel;
+    }
+
+    public static function getAll(DBInterface $db, $limit = 100, $offset = 0)
+    {
+        $response = $db->getAll((new self())->getTableName(), $limit, $offset);
+
+        $result = [];
+
+        while (!empty($response['hits']['hits'])) {
+
+            foreach ($response['hits']['hits'] as $hit){
+                $result[] = $hit;
+            }
+
+            $offset = $limit + $offset;
+            $response = $db->getAll((new self())->getTableName(), $limit, $offset);
+        }
+
+        return $result;
+    }
+
+    /**
+     * @param DBInterface $db
+     */
+    public function save(DBInterface $db)
+    {
+        return $db->save($this->getProperties());
+    }
+
+    /**
+     * @return array
+     */
+    public function getProperties()
+    {
+        return get_object_vars($this);
+    }
+}
diff --git a/app/src/hw/models/youtube/Video.php b/app/src/hw/models/youtube/Video.php
new file mode 100644
index 000000000..9f7417530
--- /dev/null
+++ b/app/src/hw/models/youtube/Video.php
@@ -0,0 +1,230 @@
+<?php
+
+namespace VideoPlatform\models\youtube;
+
+use VideoPlatform\interfaces\DBInterface;
+use VideoPlatform\models\ActiveRecord;
+
+class Video extends ActiveRecord
+{
+    private $id;
+    private $publishedAt;
+    private $channelId;
+    private $title;
+    private $description;
+    private $categoryId;
+    private $viewCount;
+    private $likeCount;
+    private $dislikeCount;
+    private $commentCount;
+
+    private $tableName = 'videos';
+
+    /**
+     * @return string
+     */
+    public function getTableName(): string
+    {
+        return $this->tableName;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * @param mixed $id
+     */
+    public function setId($id): void
+    {
+        $this->id = $id;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getPublishedAt()
+    {
+        return $this->publishedAt;
+    }
+
+    /**
+     * @param mixed $publishedAt
+     */
+    public function setPublishedAt($publishedAt): void
+    {
+        $this->publishedAt = $publishedAt;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getChannelId()
+    {
+        return $this->channelId;
+    }
+
+    /**
+     * @param mixed $channelId
+     */
+    public function setChannelId($channelId): void
+    {
+        $this->channelId = $channelId;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * @param mixed $title
+     */
+    public function setTitle($title): void
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getDescription()
+    {
+        return $this->description;
+    }
+
+    /**
+     * @param mixed $description
+     */
+    public function setDescription($description): void
+    {
+        $this->description = $description;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getCategoryId()
+    {
+        return $this->categoryId;
+    }
+
+    /**
+     * @param mixed $categoryId
+     */
+    public function setCategoryId($categoryId): void
+    {
+        $this->categoryId = $categoryId;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getViewCount()
+    {
+        return $this->viewCount;
+    }
+
+    /**
+     * @param mixed $viewCount
+     */
+    public function setViewCount($viewCount): void
+    {
+        $this->viewCount = $viewCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getLikeCount()
+    {
+        return $this->likeCount;
+    }
+
+    /**
+     * @param mixed $likeCount
+     */
+    public function setLikeCount($likeCount): void
+    {
+        $this->likeCount = $likeCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getDislikeCount()
+    {
+        return $this->dislikeCount;
+    }
+
+    /**
+     * @param mixed $dislikeCount
+     */
+    public function setDislikeCount($dislikeCount): void
+    {
+        $this->dislikeCount = $dislikeCount;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getCommentCount()
+    {
+        return $this->commentCount;
+    }
+
+    /**
+     * @param mixed $commentCount
+     */
+    public function setCommentCount($commentCount): void
+    {
+        $this->commentCount = $commentCount;
+    }
+
+    /**
+     * @param DBInterface $db
+     */
+    public function save(DBInterface $db)
+    {
+        return $db->save($this->getProperties());
+    }
+
+    /**
+     * @return array
+     */
+    public function getProperties()
+    {
+        return get_object_vars($this);
+    }
+
+    public static function findById(DBInterface $db, $id): self
+    {
+        $result = $db->findById((new self())->tableName, $id);
+
+        $video = new self();
+        $video->setId($result['id']);
+        $video->setPublishedAt($result['publishedAt']);
+        $video->setChannelId($result['channelId']);
+        $video->setTitle($result['title']);
+        $video->setDescription($result['description']);
+        $video->setCategoryId($result['categoryId']);
+        $video->setViewCount($result['viewCount']);
+        $video->setLikeCount($result['likeCount']);
+        $video->setDislikeCount($result['dislikeCount']);
+        $video->setCommentCount($result['commentCount']);
+
+        return $video;
+    }
+
+    public static function getAll(DBInterface $db, $limit, $offset)
+    {
+        // TODO: Implement getAll() method.
+    }
+}
\ No newline at end of file
diff --git a/app/src/hw/services/YoutubeService.php b/app/src/hw/services/YoutubeService.php
new file mode 100644
index 000000000..88cf89932
--- /dev/null
+++ b/app/src/hw/services/YoutubeService.php
@@ -0,0 +1,254 @@
+<?php
+
+namespace VideoPlatform\services;
+
+use GuzzleHttp\Exception\GuzzleException;
+use Monolog\Logger;
+use VideoPlatform\DB\ElasticSearch;
+use VideoPlatform\DB\MongoDB;
+use VideoPlatform\exceptions\AppException;
+use VideoPlatform\helpers\ArrayHelper;
+use VideoPlatform\interfaces\DBInterface;
+use VideoPlatform\interfaces\VideoSharingServiceInterface;
+use VideoPlatform\loggers\AppLogger;
+use VideoPlatform\models\youtube\Channel;
+use VideoPlatform\models\youtube\Video;
+use VideoPlatform\statistics\YoutubeChannelStatistics;
+use VideoPlatform\traits\RequestTrait;
+
+class YoutubeService implements VideoSharingServiceInterface
+{
+    use RequestTrait;
+
+    const PLATFORM_NAME = 'youtube';
+
+    private $apiKey;
+    private $clientSecret;
+    private $baseUrl = 'https://youtube.googleapis.com/youtube/v3';
+
+    private DBInterface $db;
+
+    public function __construct()
+    {
+        $config = $this->getConfig();
+
+        $this->apiKey = $config['api_key'];
+        $this->clientSecret = $config['client_secret'];
+
+        $this->identifyDb();
+    }
+
+    /**
+     * @return array
+     */
+    public function getConfig(): array
+    {
+        return [
+            'api_key' => $_ENV['YOUTUBE_API_KEY'],
+            'client_secret' => $_ENV['YOUTUBE_CLIENT_SECRET']
+        ];
+    }
+
+    /**
+     * @return array
+     * @throws GuzzleException|AppException
+     */
+    public function getChannelDetail(): array
+    {
+
+        $url = $this->baseUrl . '/channels?part=snippet,contentDetails,statistics' . '&id=' . trim($_SERVER['argv'][2])
+            . '&key=' . $this->apiKey;
+
+        $data = $this->sendRequest('GET', $url);
+
+        if (empty($data['items'])) {
+            throw new AppException('not found');
+        }
+
+        return $data['items'];
+    }
+
+    /**
+     * @param $channelId
+     * @param string $nextPageToken
+     * @return array
+     * @throws GuzzleException
+     */
+    public function getVideos($channelId, $nextPageToken = ''): array
+    {
+        $url = $this->baseUrl . '/search?channelId=' . $channelId . '&part=snippet&order=date&maxResults=50' .
+            '&key=' . $this->apiKey;
+
+        if (!empty($nextPageToken)) $url .= '&pageToken=' . $nextPageToken;
+
+        return $this->sendRequest('GET', $url);
+    }
+
+    /**
+     * @param $videoIds
+     * @return array
+     * @throws GuzzleException|AppException
+     */
+    public function getVideoDetail($videoIds): array
+    {
+        $videoIds = implode(',' , $videoIds);
+
+        $url = $this->baseUrl . '/videos?part=snippet,statistics&id=' . $videoIds . '&key=' . $this->apiKey;
+
+        $data = $this->sendRequest('GET', $url);
+
+        if (empty($data['items'])) {
+            throw new AppException('not found');
+        }
+
+        return $data['items'];
+    }
+
+    /**
+     * Получит данные о канале и видео канала, затем сохраняет в хранилище
+     * @throws GuzzleException
+     * @throws AppException
+     */
+    public function analyze()
+    {
+        $channelDetails = $this->getChannelDetail();
+
+        foreach ($channelDetails as $channel) {
+            $this->saveChannelDetails($channel);
+
+            $videos = $this->getVideos($channel['id']);
+            $ids = $this->getVideoIds($videos);
+
+            if (empty($ids)) {
+                AppLogger::addLog(Logger::NOTICE, "There is no any video on channel: " . $channel['id']);
+                continue;
+            }
+
+            $videosDetails = $this->getVideoDetail($ids);
+            $this->saveChannelVideos($videosDetails);
+
+            while (!empty($videos['nextPageToken'])) {
+                $videos = $this->getVideos($channel['id'], $videos['nextPageToken']);
+                $ids = $this->getVideoIds($videos);
+
+                if (empty($ids)) {
+                    AppLogger::addLog(Logger::NOTICE, "There is no any video on channel: " . $channel['id']);
+                    continue 2;
+                }
+
+                $videosDetails = $this->getVideoDetail($ids);
+                $this->saveChannelVideos($videosDetails);
+            }
+        }
+    }
+
+    /**
+     * @param $details
+     */
+    public function saveChannelDetails($details)
+    {
+        $channel = new Channel();
+        $channel->setId($details['id']);
+        $channel->setTitle($details['snippet']['title']);
+        $channel->setDescription($details['snippet']['description']);
+        $channel->setViewCount($details['statistics']['viewCount']);
+        $channel->setSubscriberCount($details['statistics']['subscriberCount']);
+        $channel->setVideoCount($details['statistics']['videoCount']);
+
+        $result = $channel->save($this->db);
+        echo "Channel ID: $result \n";
+    }
+
+    public function saveChannelVideos($videoDetails)
+    {
+        foreach ($videoDetails as $videoDetail) {
+            $video = new Video();
+
+            $video->setId($videoDetail['id']);
+            $video->setPublishedAt($videoDetail['snippet']['publishedAt']);
+            $video->setChannelId($videoDetail['snippet']['channelId']);
+            $video->setTitle($videoDetail['snippet']['title']);
+            $video->setDescription($videoDetail['snippet']['description']);
+            $video->setCategoryId($videoDetail['snippet']['categoryId']);
+            $video->setViewCount($videoDetail['viewCount']);
+            $video->setLikeCount($videoDetail['statistics']['likeCount']);
+            $video->setDislikeCount($videoDetail['statistics']['dislikeCount']);
+            $video->setCommentCount($videoDetail['statistics']['commentCount']);
+
+            $result = $video->save($this->db);
+            echo "Video ID: $result \n";
+        }
+    }
+
+    /**
+     * @param $id
+     * @return Channel
+     */
+    public function findChannelById($id)
+    {
+        return Channel::findById($this->db, $id);
+    }
+
+    /**
+     * @throws \Exception
+     */
+    private function identifyDb(): void
+    {
+        switch ($_ENV['NO_SQL_DB']) {
+            case DBInterface::ELASTIC_SEARCH;
+                $this->db = new ElasticSearch();
+                break;
+            case DBInterface::MONGO_DB:
+                $this->db = new MongoDB();
+                break;
+            default:
+                throw new \Exception('wrong db');
+        }
+    }
+
+    /**
+     * @param $videos
+     * @return array
+     */
+    private function getVideoIds($videos)
+    {
+        $ids = ArrayHelper::getColumn($videos['items'], 'id');
+        return ArrayHelper::getColumn($ids, 'videoId');
+    }
+
+    /**
+     * тут собирается статистика по лайкам/дислайкам
+     *
+     * @return array
+     */
+    public function getStatistics()
+    {
+        $channelId = $_SERVER['argv'][2];
+
+        $channel = Channel::findById($this->db, $channelId);
+        $youtubeStatistics = new YoutubeChannelStatistics($this->db);
+        $statistics = $youtubeStatistics->getTotalLikesDislikes($channel->getId());
+
+        return [
+            'channelId'=> $channelId,
+            'LikeDislikeCounter' => $statistics
+        ];
+    }
+
+    /**
+     * вернет топ N каналов по соотношению totalLikes/totalDislikes
+     *
+     * @throws \Exception
+     */
+    public function getTopChannels()
+    {
+        $n = (int)$_SERVER['argv'][2];
+
+        if (false === is_int($n) or $n < 1) {
+            throw new AppException('specify an integer');
+        }
+
+        $topN = new YoutubeChannelStatistics($this->db);
+        return $topN->getTopChannels($n);
+    }
+}
diff --git a/app/src/hw/statistics/YoutubeChannelStatistics.php b/app/src/hw/statistics/YoutubeChannelStatistics.php
new file mode 100644
index 000000000..980184af6
--- /dev/null
+++ b/app/src/hw/statistics/YoutubeChannelStatistics.php
@@ -0,0 +1,78 @@
+<?php
+namespace VideoPlatform\statistics;
+
+use VideoPlatform\interfaces\DBInterface;
+use VideoPlatform\models\youtube\Channel;
+use VideoPlatform\models\youtube\Video;
+
+class YoutubeChannelStatistics
+{
+    private DBInterface $db;
+
+    public function __construct(DBInterface $db)
+    {
+        $this->db = $db;
+    }
+
+    public function getTotalLikesDislikes($channelId)
+    {
+        $queryParams = [
+            'where' => [
+                'channelId' => $channelId
+            ],
+            'limit' => 200,
+            'offset' => 0
+        ];
+
+        $response = $this->db->query((new Video())->getTableName(), $queryParams);
+
+        $totalLikes = 0;
+        $totalDislikes = 0;
+
+        /*
+         * $response['hits']['total']['value'] вот эта штука возвращает всегда total в индексе, а не в hits
+         * поэтому не получится определить через $response['hits']['total']['value'] > 0
+         * здесь наверное тогда лучше через !empty($response['hits']['hits']) или isset($response['hits']['hits'][0])
+         * хотя даже если использовать count($response['hits']['hits']), я же поставил лимит, разом максимум 200 записей
+         */
+        while (!empty($response['hits']['hits'])) {
+
+            foreach ($response['hits']['hits'] as $hit) {
+                $totalLikes = $totalLikes + $hit['_source']['likeCount'];
+                $totalDislikes = $totalDislikes + $hit['_source']['dislikeCount'];
+            }
+
+            $queryParams['offset'] = $queryParams['limit'] + $queryParams['offset'];
+            $response = $this->db->query((new Video())->getTableName(), $queryParams);
+        }
+
+        return ['totalLikes' => $totalLikes, 'totalDislikes' => $totalDislikes];
+    }
+
+    /**
+     * вернет топ N каналов по соотношению totalLikes/totalDislikes
+     * @param int $topN
+     * @return array
+     */
+    public function getTopChannels(int $topN)
+    {
+        $channels = Channel::getAll($this->db);
+
+        $result = [];
+
+        foreach ($channels as $channel) {
+            $total= $this->getTotalLikesDislikes($channel['_id']);
+            $value = $total['totalLikes']/$total['totalDislikes'];
+            $result[] =  [
+                "channel_id" => $channel['_id'],
+                "value" => $value
+            ];
+        }
+
+        usort($result, function($a, $b) {
+            return $b['value'] <=> $a['value'];
+        });
+
+        return array_slice($result, 0, $topN);
+    }
+}
\ No newline at end of file
diff --git a/app/src/hw/traits/RequestTrait.php b/app/src/hw/traits/RequestTrait.php
new file mode 100644
index 000000000..fdbb5dda7
--- /dev/null
+++ b/app/src/hw/traits/RequestTrait.php
@@ -0,0 +1,28 @@
+<?php
+
+
+namespace VideoPlatform\traits;
+use GuzzleHttp;
+use GuzzleHttp\Exception\GuzzleException;
+
+trait RequestTrait
+{
+    /**
+     * @param string $method
+     * @param $url
+     * @param array $data
+     * @return array|mixed
+     * @throws GuzzleException
+     */
+    public function sendRequest(string $method, $url, $data = [])
+    {
+        try {
+            $client = new GuzzleHttp\Client();
+            $result = $client->request($method, $url, $data);
+            return !empty($result) ? json_decode($result->getBody(), true) : [];
+        }catch (\Exception $e){
+            http_response_code($e->getCode());
+            throw $e;
+        }
+    }
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 000000000..88b309df0
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,41 @@
+version: '3.8'
+
+services:
+  nginx:
+    container_name: nginx
+    build:
+      context: ./docker/nginx
+    volumes:
+      - ./app:/var/www/hw-otus
+      - ./docker/nginx/config/default.conf:/etc/nginx/conf.d/default.conf
+    ports:
+      - "8787:80"
+
+  php-fpm:
+    container_name: php-fpm
+    build:
+      context: ./docker/php-fpm
+    volumes:
+      - ./app:/var/www/hw-otus
+
+  elastic-search:
+    container_name: elastic-search
+    build:
+      context: ./docker/elastic-search
+    ports:
+      - 9200:9200
+    environment:
+      - discovery.type=single-node
+
+  mongo-db:
+    container_name: mongo-db
+    build:
+      context: ./docker/mongo-db
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: root
+      MONGO_INITDB_ROOT_PASSWORD: root
+      MONGO_INITDB_DATABASE: otus
+    volumes:
+      - ./docker/mongo-db/init-mongo.js:/docker-entrypoint-initdb.d/init-mongo.js:ro
+    ports:
+      - 27017:27017
\ No newline at end of file
diff --git a/docker/elastic-search/Dockerfile b/docker/elastic-search/Dockerfile
new file mode 100644
index 000000000..d582d1f5b
--- /dev/null
+++ b/docker/elastic-search/Dockerfile
@@ -0,0 +1 @@
+FROM elasticsearch:7.9.3
\ No newline at end of file
diff --git a/docker/mongo-db/Dockerfile b/docker/mongo-db/Dockerfile
new file mode 100644
index 000000000..cbe76502d
--- /dev/null
+++ b/docker/mongo-db/Dockerfile
@@ -0,0 +1 @@
+FROM mongo:3.6.21
diff --git a/docker/mongo-db/init-mongo.js b/docker/mongo-db/init-mongo.js
new file mode 100644
index 000000000..236071745
--- /dev/null
+++ b/docker/mongo-db/init-mongo.js
@@ -0,0 +1,10 @@
+db.createUser(
+    {
+        user:"root",
+        pwd:"root",
+        roles: {
+            role:"readWrite",
+            db:"otus"
+        }
+    }
+)
\ No newline at end of file
diff --git a/docker/nginx/Dockerfile b/docker/nginx/Dockerfile
new file mode 100644
index 000000000..45ad9f589
--- /dev/null
+++ b/docker/nginx/Dockerfile
@@ -0,0 +1,3 @@
+FROM nginx
+
+WORKDIR /var/www/hw-otus
\ No newline at end of file
diff --git a/docker/nginx/config/default.conf b/docker/nginx/config/default.conf
new file mode 100644
index 000000000..e6ba61102
--- /dev/null
+++ b/docker/nginx/config/default.conf
@@ -0,0 +1,21 @@
+server {
+
+    root /var/www/hw-otus/public;
+    index index.php;
+
+    listen  80;
+
+    location / {
+        try_files $uri $uri/ /index.php$is_args$args;
+    }
+
+    # Server PHP config
+    location ~ \.php {
+        fastcgi_pass	php-fpm:9000;
+        include 		fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+        fastcgi_param PATH_INFO $fastcgi_path_info;
+        try_files $uri =404;
+        fastcgi_index	index.php;
+    }
+}
\ No newline at end of file
diff --git a/docker/php-fpm/Dockerfile b/docker/php-fpm/Dockerfile
new file mode 100644
index 000000000..2a8ca35d3
--- /dev/null
+++ b/docker/php-fpm/Dockerfile
@@ -0,0 +1,26 @@
+FROM php:7.4-fpm
+
+#необходимые утилиты
+RUN apt-get update && apt-get install -y \
+curl \
+libssl-dev \
+libzip-dev \
+zip \
+git \
+wget \
+grep \
+libz-dev \
+libmemcached-dev \
+libpq-dev \
+libcurl4-openssl-dev \
+nano \
+&& docker-php-ext-install zip
+
+RUN pecl install mongodb \
+    &&  echo "extension=mongodb.so" > /usr/local/etc/php/conf.d/mongo.ini
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer
+
+WORKDIR /var/www/hw-otus/
+EXPOSE 9000
+CMD ["php-fpm"]
\ No newline at end of file