<?php

$user = getenv('GITEA_USER');
$pass = getenv('GITEA_PASS');

$gitea_url = 'https://git.bit5.ru';

$auth_token = gitea_login($gitea_url, $user, $pass);
if(!$auth_token)
  throw new Exception("Could not login to gitea");

gitea_check_repo($auth_token, $gitea_url, 'bit/skeletik', 
  array(
  'check_forks' => true, 
  'check_composer' => true, 
  'check_upm' => false
  )
);
gitea_check_repo($auth_token, $gitea_url, 'bit/skeletor',
  array(
  'check_forks' => true, 
  'check_composer' => true, 
  'check_upm' => true
  )
);
gitea_check_repo($auth_token, $gitea_url, 'bit/skeletor-rnd',
  array(
  'check_forks' => true, 
  'check_composer' => true, 
  'check_upm' => true
  )
);
gitea_check_repo($auth_token, $gitea_url, 'game/gymmania',
  array(
  'check_forks' => false, 
  'check_composer' => true, 
  'check_upm' => false
  )
);
//////////////////////////////////

function gitea_login($gitea_url, $user, $pass)
{
  $token_field = "test_".time();
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, "https://git.bit5.ru/api/v1/users/$user/tokens");
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(array("name" => $token_field)));
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($ch, CURLOPT_USERPWD, $user . ":" . $pass);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  $json = curl_exec($ch);
  curl_close($ch);

  $res = json_decode($json, true);
  if(!isset($res['sha1']))
    throw new Exception("Could not login to gitea");

  return $res['sha1'];
}

function gitea_api_call($auth_token, $gitea_url, $api_path)
{
  $api_url = "$gitea_url/api/v1/$api_path"; 
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL,  $api_url);
  curl_setopt($ch, CURLOPT_HEADER, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, 
    array(
      'Accept: application/json',
      "Authorization: token $auth_token"
    )
  );
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  $response = curl_exec($ch);

  $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
  $header = substr($response, 0, $header_size);
  $json = substr($response, $header_size);

  $info = curl_getinfo($ch);

  curl_close($ch);

  if($info['http_code'] != 200)
    return $info['http_code'];

  return json_decode($json, true);
}

function gitea_get_tags($auth_token, $gitea_url, $repo)
{
  $res = gitea_api_call($auth_token, $gitea_url, "repos/$repo/tags");
  if($res === 404)
    return array();
  else if(is_numeric($res))
    throw new Exception("Bad response: $res");
  return $res;
}

function gitea_get_source($auth_token, $gitea_url, $repo, $path)
{
  $res = gitea_api_call($auth_token, $gitea_url, "repos/$repo/contents/$path");

  if(is_numeric($res))
    throw new Exception("Bad response: $res");

  if(!isset($res['content']))
    throw new Exception("Could not get file at path '$path'");

  return base64_decode($res['content']);
}

function gitea_get_forks($auth_token, $gitea_url, $repo)
{
  $res = gitea_api_call($auth_token, $gitea_url, "repos/$repo/forks");
  if(is_numeric($res))
    throw new Exception("Bad response: $res");
  return $res;
}

function gitea_get_commits($auth_token, $gitea_url, $repo)
{
  $res = gitea_api_call($auth_token, $gitea_url, "repos/$repo/commits");
  if(is_numeric($res))
    throw new Exception("Bad response: $res");
  return $res;
}

function gitea_get_commit($auth_token, $gitea_url, $repo, $sha)
{
  $res = gitea_api_call($auth_token, $gitea_url, "repos/$repo/git/commits/$sha");
  if($res === 404)
    return null;
  else if(is_numeric($res))
    throw new Exception("Bad response: $res");
  else
    return $res;
}

function github_get_tags($github_repo)
{
  $api_url = "https://api.github.com/repos/$github_repo/tags"; 
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL,  $api_url);
  curl_setopt($ch, CURLOPT_HEADER, true);
  curl_setopt($ch, CURLOPT_USERAGENT, "test");
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  $response = curl_exec($ch);

  $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
  $header = substr($response, 0, $header_size);
  $json = substr($response, $header_size);

  $info = curl_getinfo($ch);

  curl_close($ch);

  if($info['http_code'] != 200)
    return $info['http_code'];

  return json_decode($json, true);
}

function _is_composer_git_repo(array $repos, $repo) 
{
  foreach($repos as $item)
  {
    if($item['type'] == 'git' && $item['url'] == $repo)
      return true;
  }
  return false;
}

function _is_composer_github_package(array $repos, $repo, &$github_repo) 
{
  foreach($repos as $item)
  {
    if($item['type'] == 'package' && 
      $item['package']['name'] == $repo && 
      preg_match('~https?://github.com/([^/]+)/([^/]+)~', $item['package']['dist']['url'], $matches))
    {
      $github_repo = $matches[1].'/'.$matches[2];
      return true;
    }
  }
  return false;
}


function gitea_check_repo(
  $auth_token, 
  $gitea_url, 
  $base_repo, 
  array $opts
 )
{
  echo "************************* Checking repo '$base_repo' *************************\n";

  $commits = gitea_get_commits($auth_token, $gitea_url, $base_repo);

  if($opts['check_forks'])
  {
    $forks = gitea_get_forks($auth_token, $gitea_url, $base_repo);
    $behind_forks = array();
    echo "== Checking forks ==\n";
    foreach($forks as $fork)
    {
      $repo_fork = $fork['full_name'];
      foreach($commits as $commit)
      {
        $status = gitea_get_commit($auth_token, $gitea_url, $repo_fork, $commit['sha']);
        if($status === null)
        {
          $behind_forks[] = $repo_fork;
          break;
        }
        //early exit if commit exists
        else if(isset($status['sha']))
        {
          break;
        }
      }
    }
    echo "Behind forks: " . implode(", ", $behind_forks) . "\n";
  }

  if($opts['check_composer'])
  {
    echo "== Checking Composer manifest ==\n";
    $composer_json = gitea_get_source($auth_token, $gitea_url, $base_repo, "composer/composer.json");
    $composer_arr = json_decode($composer_json, true);

    foreach($composer_arr['require'] as $repo => $version)
    {
      if(strpos($repo, "bit/") !== 0)
        continue;

      if(_is_composer_git_repo($composer_arr['repositories'], "$gitea_url/$repo"))
      {
        $tags = gitea_get_tags($auth_token, $gitea_url, $repo);
        if(isset($tags[0]))
        {
          $last_tag_info = $tags[0];
          if(ltrim($last_tag_info["name"], 'v') != ltrim($version, 'v'))
            echo "Package '$repo': current $version, latest {$last_tag_info["name"]}\n";
        }
        else
          echo "Could not fetch tags for $repo\n";
      }
      else if(_is_composer_github_package($composer_arr['repositories'], $repo, $github_repo))
      {
        $tags = github_get_tags($github_repo);
        if(isset($tags[0]))
        {
          $last_tag_info = $tags[0];
          if(ltrim($last_tag_info["name"], 'v') != ltrim($version, 'v'))
            echo "Package '$repo': current $version, latest {$last_tag_info["name"]}\n";
        }
      }
    }
  }

  if($opts['check_upm'])
  {
    echo "== Checking UPM manifest ==\n";
    $upm_json = gitea_get_source($auth_token, $gitea_url, $base_repo, "unity/Packages/manifest.json");
    $upm_arr = json_decode($upm_json, true);

    foreach($upm_arr['dependencies'] as $name => $version)
    {
      if(strpos($name, "com.bitgames.") !== 0)
        continue;

      $name = str_replace("com.bitgames.ecs", "com.bitgames.leoecs", $name);
      $name = str_replace("com.bitgames.", "", $name);
      $name = str_replace(".", "-", $name);
      $repo = 'bit-upm/' . $name; 

      $tags = gitea_get_tags($auth_token, $gitea_url, $repo);
      if(isset($tags[0]))
      {
        $last_tag_info = $tags[0];
        if(ltrim($last_tag_info["name"], 'v') != ltrim($version, 'v'))
          echo "Package '$repo': current $version, latest {$last_tag_info["name"]}\n";
      }
      else
        echo "Could not fetch tags for $repo\n";
    }
  }
}