<?php declare(strict_types=1);
namespace openvk\VKAPI\Handlers;
use Chandler\Database\DatabaseConnection;
use openvk\Web\Models\Entities\Audio as AEntity;
use openvk\Web\Models\Entities\Playlist;
use openvk\Web\Models\Repositories\Audios;
use openvk\Web\Models\Repositories\Clubs;
use openvk\Web\Models\Repositories\Util\EntityStream;

final class Audio extends VKAPIRequestHandler
{
    private function toSafeAudioStruct(?AEntity $audio, ?string $hash = NULL, bool $need_user = false): object
    {
        if(!$audio)
            $this->fail(0404, "Audio not found");
        else if(!$audio->canBeViewedBy($this->getUser()))
            $this->fail(201, "Access denied to audio(" . $audio->getPrettyId() . ")");

        # рофлан ебало
        $privApi  = $hash && $GLOBALS["csrfCheck"];
        $audioObj = $audio->toVkApiStruct($this->getUser());
        if(!$privApi) {
            $audioObj->manifest = false;
            $audioObj->keys     = false;
        }

        if($need_user) {
            $user = (new \openvk\Web\Models\Repositories\Users)->get($audio->getOwner()->getId());
            $audioObj->user = (object) [
                "id"       => $user->getId(),
                "photo"    => $user->getAvatarUrl(),
                "name"     => $user->getCanonicalName(),
                "name_gen" => $user->getCanonicalName(),
            ];
        }

        return $audioObj;
    }

    private function streamToResponse(EntityStream $es, int $offset, int $count, ?string $hash = NULL): object
    {
        $items = [];
        foreach($es->offsetLimit($offset, $count) as $audio) {
            $items[] = $this->toSafeAudioStruct($audio, $hash);
        }

        return (object) [
            "count" => sizeof($items),
            "items" => $items,
        ];
    }

    private function validateGenre(?string& $genre_str, ?int $genre_id): void
    {
        if(!is_null($genre_str)) {
            if(!in_array($genre_str, AEntity::genres))
                $this->fail(8, "Invalid genre_str");
        } else if(!is_null($genre_id)) {
            $genre_str = array_flip(AEntity::vkGenres)[$genre_id] ?? NULL;
            if(!$genre_str)
                $this->fail(8, "Invalid genre ID $genre_id");
        }
    }

    private function audioFromAnyId(string $id): ?AEntity
    {
        $descriptor = explode("_", $id);
        if(sizeof($descriptor) === 1) {
            if(ctype_digit($descriptor[0])) {
                $audio = (new Audios)->get((int) $descriptor[0]);
            } else {
                $aid = base64_decode($descriptor[0], true);
                if(!$aid)
                    $this->fail(8, "Invalid audio $id");

                $audio = (new Audios)->get((int) $aid);
            }
        } else if(sizeof($descriptor) === 2) {
            $audio = (new Audios)->getByOwnerAndVID((int) $descriptor[0], (int) $descriptor[1]);
        } else {
            $this->fail(8, "Invalid audio $id");
        }

        return $audio;
    }

    function getById(string $audios, ?string $hash = NULL, int $need_user = 0): object
    {
        $this->requireUser();

        $audioIds = array_unique(explode(",", $audios));
        if(sizeof($audioIds) === 1) {
            $audio = $this->audioFromAnyId($audioIds[0]);

            return (object) [
                "count" => 1,
                "items" => [
                    $this->toSafeAudioStruct($audio, $hash, (bool) $need_user),
                ],
            ];
        } else if(sizeof($audioIds) > 6000) {
            $this->fail(1980, "Can't get more than 6000 audios at once");
        }

        $audios = [];
        foreach($audioIds as $id)
            $audios[] = $this->getById($id, $hash)->items[0];

        return (object) [
            "count" => sizeof($audios),
            "items" => $audios,
        ];
    }

    function isLagtrain(string $audio_id): int
    {
        $this->requireUser();

        $audio = $this->audioFromAnyId($audio_id);
        if(!$audio)
            $this->fail(0404, "Audio not found");

        # Possible information disclosure risks are acceptable :D
        return (int) (strpos($audio->getName(), "Lagtrain") !== false);
    }

    // TODO stub
    function getRecommendations(): object
    {
        return (object) [
            "count" => 0,
            "items" => [],
        ];
    }

    function getPopular(?int $genre_id = NULL, ?string $genre_str = NULL, int $offset = 0, int $count = 100, ?string $hash = NULL): object
    {
        $this->requireUser();
        $this->validateGenre($genre_str, $genre_id);

        $results = (new Audios)->getGlobal(Audios::ORDER_POPULAR, $genre_str);

        return $this->streamToResponse($results, $offset, $count, $hash);
    }

    function getFeed(?int $genre_id = NULL, ?string $genre_str = NULL, int $offset = 0, int $count = 100, ?string $hash = NULL): object
    {
        $this->requireUser();
        $this->validateGenre($genre_str, $genre_id);

        $results = (new Audios)->getGlobal(Audios::ORDER_NEW, $genre_str);

        return $this->streamToResponse($results, $offset, $count, $hash);
    }

    function search(string $q, int $auto_complete = 0, int $lyrics = 0, int $performer_only = 0, int $sort = 2, int $search_own = 0, int $offset = 0, int $count = 30, ?string $hash = NULL): object
    {
        $this->requireUser();

        if(($auto_complete + $search_own) != 0)
            $this->fail(10, "auto_complete and search_own are not supported");
        else if($count > 300 || $count < 1)
            $this->fail(8, "count is invalid: $count");

        $results = (new Audios)->search($q, $sort, (bool) $performer_only, (bool) $lyrics);

        return $this->streamToResponse($results, $offset, $count, $hash);
    }

    function getCount(int $owner_id, int $uploaded_only = 0): int
    {
        $this->requireUser();

        if($owner_id < 0) {
            $owner_id *= -1;
            $group = (new Clubs)->get($owner_id);
            if(!$group)
                $this->fail(0404, "Group not found");

            return (new Audios)->getClubCollectionSize($group);
        }

        $user = (new \openvk\Web\Models\Repositories\Users)->get($owner_id);
        if(!$user)
            $this->fail(0404, "User not found");

        if(!$user->getPrivacyPermission("audios.read", $this->getUser()))
            $this->fail(15, "Access denied");

        if($uploaded_only) {
            return DatabaseConnection::i()->getContext()->table("audios")
                ->where([
                    "deleted" => false,
                    "owner" => $owner_id,
                ])->count();
        }

        return (new Audios)->getUserCollectionSize($user);
    }

	function get(int $owner_id = 0, int $album_id = 0, string $audio_ids = '', int $need_user = 1, int $offset = 0, int $count = 100, int $uploaded_only = 0, int $need_seed = 0, ?string $shuffle_seed = NULL, int $shuffle = 0, ?string $hash = NULL): object
	{
		$this->requireUser();

        $shuffleSeed    = NULL;
        $shuffleSeedStr = NULL;
        if($shuffle == 1) {
            if(!$shuffle_seed) {
                if($need_seed == 1) {
                    $shuffleSeed    = openssl_random_pseudo_bytes(6);
                    $shuffleSeedStr = base64_encode($shuffleSeed);
                    $shuffleSeed    = hexdec(bin2hex($shuffleSeed));
                } else {
                    $hOffset        = ((int) date("i") * 60) + (int) date("s");
                    $thisHour       = time() - $hOffset;
                    $shuffleSeed    = $thisHour + $this->getUser()->getId();
                    $shuffleSeedStr = base64_encode(hex2bin(dechex($shuffleSeed)));
                }
            } else {
                $shuffleSeed    = hexdec(bin2hex(base64_decode($shuffle_seed)));
                $shuffleSeedStr = $shuffle_seed;
            }
        }

        if($album_id != 0) {
            $album = (new Audios)->getPlaylist($album_id);
            if(!$album)
                $this->fail(0404, "album_id invalid");
            else if(!$album->canBeViewedBy($this->getUser()))
                $this->fail(600, "Can't open this album for reading");

            $songs = [];
            $list  = $album->getAudios($offset, $count, $shuffleSeed);

            foreach($list as $song)
                $songs[] = $this->toSafeAudioStruct($song, $hash, $need_user == 1);

            $response = (object) [
                "count" => sizeof($songs),
                "items" => $songs,
            ];
            if(!is_null($shuffleSeed))
                $response->shuffle_seed = $shuffleSeedStr;

            return $response;
        }

        if(!empty($audio_ids)) {
            $audio_ids = explode(",", $audio_ids);
            if(!$audio_ids)
                $this->fail(10, "Audio::get@L0d186:explode(string): Unknown error");
            else if(sizeof($audio_ids) < 1)
                $this->fail(8, "Invalid audio_ids syntax");

            if(!is_null($shuffleSeed))
                $audio_ids = knuth_shuffle($audio_ids, $shuffleSeed);

            $obj = $this->getById(implode(",", $audio_ids), $hash, $need_user);
            if(!is_null($shuffleSeed))
                $obj->shuffle_seed = $shuffleSeedStr;

            return $obj;
        }

        $dbCtx = DatabaseConnection::i()->getContext();
        if($uploaded_only == 1) {
            if($owner_id <= 0)
                $this->fail(8, "uploaded_only can only be used with owner_id > 0");

            $user = (new \openvk\Web\Models\Repositories\Users)->get($owner_id);

            if(!$user) 
                $this->fail(0602, "Invalid user");

            if(!$user->getPrivacyPermission("audios.read", $this->getUser()))
                $this->fail(15, "Access denied: this user chose to hide his audios");

            if(!is_null($shuffleSeed)) {
                $audio_ids = [];
                $query     = $dbCtx->table("audios")->select("virtual_id")->where([
                    "owner"   => $owner_id,
                    "deleted" => 0,
                ]);

                foreach($query as $res)
                    $audio_ids[] = $res->virtual_id;

                $audio_ids = knuth_shuffle($audio_ids, $shuffleSeed);
                $audio_ids = array_slice($audio_ids, $offset, $count);
                $audio_q   = ""; # audio.getById query
                foreach($audio_ids as $aid)
                    $audio_q .= ",$owner_id" . "_$aid";

                $obj = $this->getById(substr($audio_q, 1), $hash, $need_user);
                $obj->shuffle_seed = $shuffleSeedStr;

                return $obj;
            }

            $res = (new Audios)->getByUploader((new \openvk\Web\Models\Repositories\Users)->get($owner_id));

            return $this->streamToResponse($res, $offset, $count, $hash, $need_user);
        }

        $query = $dbCtx->table("audio_relations")->select("audio")->where("entity", $owner_id);
        if(!is_null($shuffleSeed)) {
            $audio_ids = [];
            foreach($query as $aid)
                $audio_ids[] = $aid->audio;

            $audio_ids = knuth_shuffle($audio_ids, $shuffleSeed);
            $audio_ids = array_slice($audio_ids, $offset, $count);
            $audio_q   = "";
            foreach($audio_ids as $aid)
                $audio_q .= ",$aid";

            $obj = $this->getById(substr($audio_q, 1), $hash, $need_user);
            $obj->shuffle_seed = $shuffleSeedStr;

            return $obj;
        }

        $items  = [];

        if($owner_id > 0) {
            $user = (new \openvk\Web\Models\Repositories\Users)->get($owner_id);

            if(!$user)
                $this->fail(50, "Invalid user");

            if(!$user->getPrivacyPermission("audios.read", $this->getUser()))
                $this->fail(15, "Access denied: this user chose to hide his audios");
        }

        $audios = (new Audios)->getByEntityID($owner_id, $offset, $count);
        foreach($audios as $audio)
            $items[] = $this->toSafeAudioStruct($audio, $hash, $need_user == 1);

        return (object) [
            "count" => sizeof($items),
            "items" => $items,
        ];
	}

    function getLyrics(int $lyrics_id): object
    {
        $this->requireUser();

        $audio = (new Audios)->get($lyrics_id);
        if(!$audio || !$audio->getLyrics())
            $this->fail(0404, "Not found");

        if(!$audio->canBeViewedBy($this->getUser()))
            $this->fail(201, "Access denied to lyrics");

        return (object) [
            "lyrics_id" => $lyrics_id,
            "text"      => preg_replace("%\r\n?%", "\n", $audio->getLyrics()),
        ];
    }

    function beacon(int $aid, ?int $gid = NULL): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $audio = (new Audios)->get($aid);
        if(!$audio)
            $this->fail(0404, "Not Found");
        else if(!$audio->canBeViewedBy($this->getUser()))
            $this->fail(201, "Insufficient permissions to listen this audio");

        $group = NULL;
        if(!is_null($gid)) {
            $group = (new Clubs)->get($gid);
            if(!$group)
                $this->fail(0404, "Not Found");
            else if(!$group->canBeModifiedBy($this->getUser()))
                $this->fail(203, "Insufficient rights to this group");
        }

        return (int) $audio->listen($group ?? $this->getUser());
    }

    function setBroadcast(string $audio, string $target_ids): array
    {
        $this->requireUser();

        [$owner, $aid] = explode("_", $audio);
        $song = (new Audios)->getByOwnerAndVID((int) $owner, (int) $aid);
        $ids  = [];
        foreach(explode(",", $target_ids) as $id) {
            $id = (int) $id;
            if($id > 0) {
                if ($id != $this->getUser()->getId()) {
                    $this->fail(600, "Can't listen on behalf of $id");
                } else {
                    $ids[] = $id;
                    $this->beacon($song->getId());
                    continue;
                }
            }

            $group = (new Clubs)->get($id * -1);
            if(!$group)
                $this->fail(0404, "Not Found");
            else if(!$group->canBeModifiedBy($this->getUser()))
                $this->fail(203,"Insufficient rights to this group");

            $ids[] = $id;
            $this->beacon($song ? $song->getId() : 0, $id * -1);
        }

        return $ids;
    }

    function getBroadcastList(string $filter = "all", int $active = 0, ?string $hash = NULL): object
    {
        $this->requireUser();

        if(!in_array($filter, ["all", "friends", "groups"]))
            $this->fail(8, "Invalid filter $filter");

        $broadcastList = $this->getUser()->getBroadcastList($filter);
        $items = [];
        foreach($broadcastList as $res) {
            $struct = $res->toVkApiStruct();
            $status = $res->getCurrentAudioStatus();

            $struct->status_audio = $status ? $this->toSafeAudioStruct($status) : NULL;
            $items[] = $struct;
        }

        return (object) [
            "count" => sizeof($items),
            "items" => $items,
        ];
    }

    function edit(int $owner_id, int $audio_id, ?string $artist = NULL, ?string $title = NULL, ?string $text = NULL, ?int $genre_id = NULL, ?string $genre_str = NULL, int $no_search = 0): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $audio = (new Audios)->getByOwnerAndVID($owner_id, $audio_id);
        if(!$audio)
            $this->fail(0404, "Not Found");
        else if(!$audio->canBeModifiedBy($this->getUser()))
            $this->fail(201, "Insufficient permissions to edit this audio");

        if(!is_null($genre_id)) {
            $genre = array_flip(AEntity::vkGenres)[$genre_id] ?? NULL;
            if(!$genre)
                $this->fail(8, "Invalid genre ID $genre_id");

            $audio->setGenre($genre);
        } else if(!is_null($genre_str)) {
            if(!in_array($genre_str, AEntity::genres))
                $this->fail(8, "Invalid genre ID $genre_str");

            $audio->setGenre($genre_str);
        }

        $lyrics = 0;
        if(!is_null($text)) {
            $audio->setLyrics($text);
            $lyrics = $audio->getId();
        }

        if(!is_null($artist))
            $audio->setPerformer($artist);

        if(!is_null($title))
            $audio->setName($title);

        $audio->setSearchability(!((bool) $no_search));
        $audio->setEdited(time());
        $audio->save();

        return $lyrics;
    }

    function add(int $audio_id, int $owner_id, ?int $group_id = NULL, ?int $album_id = NULL): string
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        if(!is_null($album_id)) 
            $this->fail(10, "album_id not implemented");

        // TODO get rid of dups
        $to = $this->getUser();
        if(!is_null($group_id)) {
            $group = (new Clubs)->get($group_id);
            if(!$group)
                $this->fail(0404, "Invalid group_id");
            else if(!$group->canBeModifiedBy($this->getUser()))
                $this->fail(203, "Insufficient rights to this group");

            $to = $group;
        }

        $audio = (new Audios)->getByOwnerAndVID($owner_id, $audio_id);
        if(!$audio)
            $this->fail(0404, "Not found");
        else if(!$audio->canBeViewedBy($this->getUser()))
            $this->fail(201, "Access denied to audio(owner=$owner_id, vid=$audio_id)");

        try {
            $audio->add($to);
        } catch(\OverflowException $ex) {
            $this->fail(300, "Album is full");
        }

        return $audio->getPrettyId();
    }

    function delete(int $audio_id, int $owner_id, ?int $group_id = NULL): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $from = $this->getUser();
        if(!is_null($group_id)) {
            $group = (new Clubs)->get($group_id);
            if(!$group)
                $this->fail(0404, "Invalid group_id");
            else if(!$group->canBeModifiedBy($this->getUser()))
                $this->fail(203, "Insufficient rights to this group");

            $from = $group;
        }

        $audio = (new Audios)->getByOwnerAndVID($owner_id, $audio_id);
        if(!$audio)
            $this->fail(0404, "Not found");

        $audio->remove($from);

        return 1;
    }

    function restore(int $audio_id, int $owner_id, ?int $group_id = NULL, ?string $hash = NULL): object
    {
        $this->requireUser();

        $vid = $this->add($audio_id, $owner_id, $group_id);

        return $this->getById($vid, $hash)->items[0];
    }

    function getAlbums(int $owner_id = 0, int $offset = 0, int $count = 50, int $drop_private = 1): object
    {
        $this->requireUser();

        $owner_id  = $owner_id == 0 ? $this->getUser()->getId() : $owner_id;
        $playlists = [];

        if($owner_id > 0 && $owner_id != $this->getUser()->getId()) {
            $user = (new \openvk\Web\Models\Repositories\Users)->get($owner_id);

            if(!$user->getPrivacyPermission("audios.read", $this->getUser()))
                $this->fail(50, "Access to playlists denied");
        }

        foreach((new Audios)->getPlaylistsByEntityId($owner_id, $offset, $count) as $playlist) {
            if(!$playlist->canBeViewedBy($this->getUser())) {
                if($drop_private == 1)
                    continue;

                $playlists[] = NULL;
                continue;
            }

            $playlists[] = $playlist->toVkApiStruct($this->getUser());
        }

        return (object) [
            "count" => sizeof($playlists),
            "items" => $playlists,
        ];
    }

    function searchAlbums(string $query = '', int $offset = 0, int $limit = 25, int $drop_private = 0, int $order = 0, int $from_me = 0): object
    {
        $this->requireUser();

        $playlists = [];
        $params = [];
        $order_str = 'id';
        switch($order) {
            default:
            case 0:
                $order_str = 'id';
                break;
            case 1:
                $order_str = 'length';
                break; 
            case 2:
                $order_str = 'listens';
                break; 
        }

        if($from_me === 1)
            $params['from_me'] = $this->getUser()->getId();

        $search    = (new Audios)->findPlaylists($query, $params, ['type' => $order_str, 'invert' => false]);
        foreach($search->offsetLimit($offset, $limit) as $playlist) {
            if(!$playlist->canBeViewedBy($this->getUser())) {
                if($drop_private == 0)
                    $playlists[] = NULL;

                continue;
            }

            $playlists[] = $playlist->toVkApiStruct($this->getUser());
        }

        return (object) [
            "count" => $search->size(),
            "items" => $playlists,
        ];
    }

    function addAlbum(string $title, ?string $description = NULL, int $group_id = 0): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $group = NULL;
        if($group_id != 0) {
            $group = (new Clubs)->get($group_id);
            if(!$group)
                $this->fail(0404, "Invalid group_id");
            else if(!$group->canBeModifiedBy($this->getUser()))
                $this->fail(600, "Insufficient rights to this group");
        }

        $album = new Playlist;
        $album->setName($title);
        if(!is_null($group))
            $album->setOwner($group_id * -1);
        else
            $album->setOwner($this->getUser()->getId());

        if(!is_null($description))
            $album->setDescription($description);

        $album->save();
        if(!is_null($group))
            $album->bookmark($group);
        else
            $album->bookmark($this->getUser());

        return $album->getId();
    }

    function editAlbum(int $album_id, ?string $title = NULL, ?string $description = NULL): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($album_id);
        if(!$album)
            $this->fail(0404, "Album not found");
        else if(!$album->canBeModifiedBy($this->getUser()))
            $this->fail(600, "Insufficient rights to this album");

        if(!is_null($title))
            $album->setName($title);

        if(!is_null($description))
            $album->setDescription($description);

        $album->setEdited(time());
        $album->save();

        return (int) !(!$title && !$description);
    }

    function deleteAlbum(int $album_id): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($album_id);
        if(!$album)
            $this->fail(0404, "Album not found");
        else if(!$album->canBeModifiedBy($this->getUser()))
            $this->fail(600, "Insufficient rights to this album");

        $album->delete();

        return 1;
    }

    function moveToAlbum(int $album_id, string $audio_ids): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($album_id);
        if(!$album)
            $this->fail(0404, "Album not found");
        else if(!$album->canBeModifiedBy($this->getUser()))
            $this->fail(600, "Insufficient rights to this album");

        $audios    = [];
        $audio_ids = array_unique(explode(",", $audio_ids));
        if(sizeof($audio_ids) < 1 || sizeof($audio_ids) > 1000)
            $this->fail(8, "audio_ids must contain at least 1 audio and at most 1000");

        foreach($audio_ids as $audio_id) {
            $audio = $this->audioFromAnyId($audio_id);
            if(!$audio)
                continue;
            else if(!$audio->canBeViewedBy($this->getUser()))
                continue;

            $audios[] = $audio;
        }

        if(sizeof($audios) < 1)
            return 0;

        $res = 1;
        try {
            foreach ($audios as $audio)
                $res = min($res, (int) $album->add($audio));
        } catch(\OutOfBoundsException $ex) {
            return 0;
        }

        return $res;
    }

    function removeFromAlbum(int $album_id, string $audio_ids): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($album_id);
        if(!$album)
            $this->fail(0404, "Album not found");
        else if(!$album->canBeModifiedBy($this->getUser()))
            $this->fail(600, "Insufficient rights to this album");

        $audios    = [];
        $audio_ids = array_unique(explode(",", $audio_ids));
        if(sizeof($audio_ids) < 1 || sizeof($audio_ids) > 1000)
            $this->fail(8, "audio_ids must contain at least 1 audio and at most 1000");

        foreach($audio_ids as $audio_id) {
            $audio = $this->audioFromAnyId($audio_id);
            if(!$audio)
                continue;
            else if($audio->canBeViewedBy($this->getUser()))
                continue;

            $audios[] = $audio;
        }

        if(sizeof($audios) < 1)
            return 0;

        foreach($audios as $audio)
            $album->remove($audio);

        return 1;
    }

    function copyToAlbum(int $album_id, string $audio_ids): int
    {
        return $this->moveToAlbum($album_id, $audio_ids);
    }

    function bookmarkAlbum(int $id): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($id);
        if(!$album)
            $this->fail(0404, "Not found");

        if(!$album->canBeViewedBy($this->getUser()))
            $this->fail(600, "Access error");

        return (int) $album->bookmark($this->getUser());
    }

    function unBookmarkAlbum(int $id): int
    {
        $this->requireUser();
        $this->willExecuteWriteAction();

        $album = (new Audios)->getPlaylist($id);
        if(!$album)
            $this->fail(0404, "Not found");

        if(!$album->canBeViewedBy($this->getUser()))
            $this->fail(600, "Access error");

        return (int) $album->unbookmark($this->getUser());
    }
}