<?php

class Github
{
  protected static function findReleaseAssetForOs(array $release, string $os)
  {
    if (!in_array($os, array_keys(OS::getAll())))
    {
      throw new DomainException('Unknown OS');
    }

    foreach ($release['assets'] as $asset)
    {
      $ext = substr($asset['name'], -4);
      if (
        ($os == OS::OS_LINUX &&
          ($ext == '.deb' || in_array($asset['content_type'], ['application/x-debian-package', 'application/x-deb']))) ||
        ($os == OS::OS_OSX &&
          ($ext == '.dmg' || in_array($asset['content_type'], ['application/x-diskcopy', 'application/x-apple-diskimage']))) ||
        ($os == OS::OS_WINDOWS && $ext == '.exe')
      )
      {
        return $asset;
      }
    }
  }

  public static function getAppRelease($cache = true)
  {
    try
    {
      return static::get('/repos/lbryio/lbry-app/releases/latest', $cache);
    }
    catch (Exception $e)
    {
    }

    return null;
  }

  public static function getAppAsset($os, $cache = true)
  {
    $release = static::getAppRelease($cache);
    return $release ? static::findReleaseAssetForOs($release, $os) : null;
  }


  public static function getAppDownloadUrl($os, $cache = true)
  {
    $asset = static::getAppAsset($os, $cache);
    return $asset ? $asset['browser_download_url'] : null;
  }

  public static function getAppPrereleaseDownloadUrl($os, $cache = true)
  {
    try
    {
      $releases = static::get('/repos/lbryio/lbry-app/releases', $cache);
      if (count($releases))
      {
        $asset = static::findReleaseAssetForOs($releases[0], $os);
        return $asset ? $asset['browser_download_url'] : null;
      }
    }
    catch (Exception $e)
    {
    }

    return null;
  }


  public static function getDaemonReleaseProperty($os, $property, $isAssetProperty = false, $cache = true)
  {
    if (!in_array($os, array_keys(OS::getAll())))
    {
      throw new DomainException('Unknown OS');
    }

    try
    {
      $releaseData = static::get('/repos/lbryio/lbry/releases/latest', $cache);
      foreach ($releaseData['assets'] as $asset)
      {
        if (
          ($os == OS::OS_LINUX && stripos($asset['browser_download_url'], 'linux') !== false) ||
          ($os == OS::OS_OSX && stripos($asset['browser_download_url'], 'macos') !== false) ||
          ($os == OS::OS_WINDOWS && strpos($asset['browser_download_url'], 'windows') !== false)
        )
        {
          return $isAssetProperty ? $asset[$property] : $releaseData[$property];
        }
      }
    }
    catch (Exception $e)
    {
    }

    return null;
  }

  public static function getDaemonDownloadUrl($os, $cache = true)
  {
    return static::getDaemonReleaseProperty($os, 'browser_download_url', true);
  }

  public static function get($endpoint, $cache = true)
  {
    $twoHoursInSeconds = 7200;
    return CurlWithCache::get('https://api.github.com' . $endpoint, [],
      ['user_agent' => 'LBRY', 'json_response' => true, 'cache' => $cache === true ? $twoHoursInSeconds : $cache]);
  }

  public static function listRoadmapChangesets($cache = true)
  {
    $sets        = [];
    $allReleases = [];

    $projects = ['lbry' => 'Daemon', 'lbry-app' => 'App'];

    foreach($projects as $project => $projectLabel)
    {
      $page = 1;
      do
      {
        $releases = static::get('/repos/lbryio/' . $project . '/releases?page=' . $page, $cache);
        $page++;
        $allReleases = array_merge($allReleases, array_map(function ($release) use ($project, $projectLabel)
        {
          return $release + ['project' => $projectLabel];
        }, array_filter($releases, function ($release)
        {
          return isset($release['tag_name']) && isset($release['published_at']) && $release['published_at'];
        })));
      } while (count($releases) >= 30);
    }

    foreach ($allReleases as $release)
    {
      $group   = null;
      $matches = null;
      if (preg_match('/^v(\d+)\.(\d+)\./', $release['tag_name'] ?? '', $matches))
      {
        $group = $release['project'] . ' v' . $matches[1] . '.' . $matches[2];
      }
      if ($group)
      {
        $sets[$group][] = array_intersect_key($release, [
            'prerelease' => null, 'tag_name' => null, 'published_at' => null, 'project' => null
          ]) + [
            'date'          => date('Y-m-d', strtotime($release['created_at'])),
            //I thought published_at, but GitHub displays created_at and published_at is out of sync sometimes (0.3.2, 0.3.3)
            'name'          => $release['name'] ?: $release['tag_name'],
          'url'             => $release['html_url'],
            'major_version' => (int)$matches[1],
            'minor_version' => (int)$matches[2],
            'patch_version' => (int)isset($matches[3]) ? $matches[3] : 0,
            'sort_key'      => (int)$matches[1] * 1000000 + (int)$matches[2] * 1000 + (int)($matches[3] ?? 0),
            'version'       => $matches[1] . '.' . $matches[2] . '.' . (isset($matches[3]) ? $matches[3] : ''),
            'body'          => ParsedownExtra::instance()->text($release['body'])
          ];
      }
    }

    uasort($sets, function ($sA, $sB)
    {
      if ($sA[0]['project'] != $sB[0]['project'])
      {
        return $sA[0]['project'] < $sB[0]['project'] ? -1 : 1;
      }
      return $sA[0]['sort_key'] < $sB[0]['sort_key'] ? -1 : 1;
    });
    
    foreach ($sets as $group => &$groupSet)
    {
      usort($groupSet, function ($rA, $rB) { return $rA['created_at'] <=> $rB['created_at']; });
    }

    return $sets;
  }
}