<?php

/**
 * Pony.fm - A community for pony fan music.
 * Copyright (C) 2015 Peter Deltchev
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Poniverse\Ponyfm;

use File;
use Helpers;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Auth;
use Cache;
use URL;
use Poniverse\Ponyfm\Jobs\EncodeTrackFile;
use Poniverse\Ponyfm\Traits\SlugTrait;

class Playlist extends Model
{
    use SoftDeletes, SlugTrait, DispatchesJobs;

    protected $table = 'playlists';

    protected $dates = ['deleted_at'];

    public static function summary()
    {
        return self::select('id', 'title', 'user_id', 'slug', 'created_at', 'is_public', 'description', 'comment_count',
            'download_count', 'view_count', 'favourite_count');
    }

    public function scopeUserDetails($query)
    {
        if (Auth::check()) {
            $query->with([
                'users' => function ($query) {
                    $query->whereUserId(Auth::user()->id);
                }
            ]);
        }

        return !$query;
    }

    public static function mapPublicPlaylistShow(Playlist $playlist)
    {
        $tracks = [];
        foreach ($playlist->tracks as $track) {
            /** @var $track Track */

            $tracks[] = Track::mapPublicTrackSummary($track);
        }

        $formats = [];
        foreach (Track::$Formats as $name => $format) {
            $formats[] = [
                'name' => $name,
                'extension' => $format['extension'],
                'url' => $playlist->getDownloadUrl($name),
                'size' => Helpers::formatBytes($playlist->getFilesize($name)),
                'isCacheable' => (in_array($name, Track::$CacheableFormats) ? true : false)
            ];
        }

        $comments = [];
        foreach ($playlist->comments as $comment) {
            $comments[] = Comment::mapPublic($comment);
        }

        $data = self::mapPublicPlaylistSummary($playlist);
        $data['tracks'] = $tracks;
        $data['comments'] = $comments;
        $data['formats'] = $formats;
        $data['share'] = [
            'url' => URL::to('/p' . $playlist->id),
            'tumblrUrl' => 'http://www.tumblr.com/share/link?url=' . urlencode($playlist->url) . '&name=' . urlencode($playlist->title) . '&description=' . urlencode($playlist->description),
            'twitterUrl' => 'https://platform.twitter.com/widgets/tweet_button.html?text=' . $playlist->title . ' by ' . $playlist->user->display_name . ' on Pony.fm'
        ];

        return $data;
    }

    public static function mapPublicPlaylistSummary(Playlist $playlist)
    {
        $userData = [
            'stats' => [
                'views' => 0,
                'downloads' => 0
            ],
            'is_favourited' => false
        ];

        if (Auth::check() && $playlist->users->count()) {
            $userRow = $playlist->users[0];
            $userData = [
                'stats' => [
                    'views' => (int)$userRow->view_count,
                    'downloads' => (int)$userRow->download_count,
                ],
                'is_favourited' => (bool)$userRow->is_favourited
            ];
        }

        return [
            'id' => (int)$playlist->id,
            'track_count' => $playlist->track_count,
            'title' => $playlist->title,
            'slug' => $playlist->slug,
            'created_at' => $playlist->created_at,
            'is_public' => (bool)$playlist->is_public,
            'stats' => [
                'views' => (int)$playlist->view_count,
                'downloads' => (int)$playlist->download_count,
                'comments' => (int)$playlist->comment_count,
                'favourites' => (int)$playlist->favourite_count
            ],
            'covers' => [
                'small' => $playlist->getCoverUrl(Image::SMALL),
                'normal' => $playlist->getCoverUrl(Image::NORMAL)
            ],
            'url' => $playlist->url,
            'user' => [
                'id' => (int)$playlist->user->id,
                'name' => $playlist->user->display_name,
                'url' => $playlist->user->url,
            ],
            'user_data' => $userData,
            'permissions' => [
                'delete' => Auth::check() && Auth::user()->id == $playlist->user_id,
                'edit' => Auth::check() && Auth::user()->id == $playlist->user_id
            ]
        ];
    }

    public function tracks()
    {
        return $this
            ->belongsToMany('Poniverse\Ponyfm\Track')
            ->withPivot('position')
            ->withTimestamps()
            ->orderBy('position', 'asc');
    }

    public function users()
    {
        return $this->hasMany('Poniverse\Ponyfm\ResourceUser');
    }

    public function comments()
    {
        return $this->hasMany('Poniverse\Ponyfm\Comment')->orderBy('created_at', 'desc');
    }

    public function pins()
    {
        return $this->hasMany('Poniverse\Ponyfm\PinnedPlaylist');
    }

    public function user()
    {
        return $this->belongsTo('Poniverse\Ponyfm\User');
    }

    public function hasPinFor($userId)
    {
        foreach ($this->pins as $pin) {
            if ($pin->user_id == $userId) {
                return true;
            }
        }

        return false;
    }

    public function canView($user)
    {
        return $this->is_public || ($user != null && $user->id == $this->user_id);
    }

    public function getUrlAttribute()
    {
        return URL::to('/playlist/' . $this->id . '-' . $this->slug);
    }

    public function getDownloadUrl($format)
    {
        return URL::to('p' . $this->id . '/dl.' . Track::$Formats[$format]['extension']);
    }

    public function countDownloadableTracks()
    {
        $trackCount = 0;

        foreach ($this->tracks as $track) {
            if ($track->is_downloadable == true) {
                $trackCount++;
            } else {
                continue;
            }
        }

        return $trackCount;
    }

    public function countCachedTrackFiles($format)
    {
        $cachedCount = 0;

        foreach ($this->tracks as $track) {
            /** @var $track Track */

            if ($track->is_downloadable == false) {
                continue;
            }

            $trackFile = $track->trackFiles()->where('format', $format)->firstOrFail();

            if ($trackFile->expires_at != null && File::exists($trackFile->getFile())) {
                $cachedCount++;
            }
        }

        return $cachedCount;
    }

    public function encodeCacheableTrackFiles($format)
    {
        foreach ($this->tracks as $track) {
            /** @var $track Track */

            if ($track->is_downloadable == false) {
                continue;
            }

            try {
                $trackFile = $track->trackFiles()->where('format', $format)->firstOrFail();
            } catch (ModelNotFoundException $e) {
                throw $e;
            }

            if (!File::exists($trackFile->getFile()) && $trackFile->is_in_progress != true) {
                $this->dispatch(new EncodeTrackFile($trackFile, true));
            }
        }
    }

    public function getFilesize($format)
    {
        $tracks = $this->tracks;
        if (!count($tracks)) {
            return 0;
        }

        return Cache::remember($this->getCacheKey('filesize-' . $format), 1440, function () use ($tracks, $format) {
            $size = 0;
            foreach ($tracks as $track) {
                /** @var $track Track */

                // Ensure that only downloadable tracks are added onto the file size
                if ($track->is_downloadable == 1) {
                    try {
                        $size += $track->getFilesize($format);

                    } catch (TrackFileNotFoundException $e) {
                        // do nothing - this track won't be included in the download
                    }
                }
            }

            return $size;
        });
    }

    public function getCoverUrl($type = Image::NORMAL)
    {
        if ($this->tracks->count() == 0) {
            return $this->user->getAvatarUrl($type);
        }

        return $this->tracks[0]->getCoverUrl($type);
    }

    public function pin($userId)
    {
        $pin = new PinnedPlaylist();
        $pin->playlist_id = $this->id;
        $pin->user_id = $userId;
        $pin->save();
    }

    private function getCacheKey($key)
    {
        return 'playlist-' . $this->id . '-' . $key;
    }
}