<?php

namespace App\Services;

use App\Collection;
use App\CollectionItem;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Redis;

class CollectionService
{
    const CACHE_KEY = 'pf:services:collections-v1:';

    public static function getItems($id, $start = 0, $stop = 10)
    {
        if (self::count($id)) {
            return Redis::zrangebyscore(self::CACHE_KEY.'items:'.$id, $start, $stop);
        }

        return self::coldBootItems($id);
    }

    public static function addItem($id, $sid, $score)
    {
        return Redis::zadd(self::CACHE_KEY.'items:'.$id, $score, $sid);
    }

    public static function removeItem($id, $sid)
    {
        return Redis::zrem(self::CACHE_KEY.'items:'.$id, $sid);
    }

    public static function clearItems($id)
    {
        return Redis::del(self::CACHE_KEY.'items:'.$id);
    }

    public static function coldBootItems($id)
    {
        return CollectionItem::whereCollectionId($id)
            ->orderBy('order')
            ->get()
            ->each(function ($item) use ($id) {
                return self::addItem($id, $item->object_id, $item->order);
            })
            ->map(function ($item) {
                return (string) $item->object_id;
            })
            ->values()
            ->toArray();
    }

    public static function count($id)
    {
        $count = Redis::zcard(self::CACHE_KEY.'items:'.$id);
        if (! $count) {
            self::coldBootItems($id);
            $count = Redis::zcard(self::CACHE_KEY.'items:'.$id);
        }

        return $count;
    }

    public static function getCollection($id)
    {
        $collection = Cache::remember(self::CACHE_KEY.'get:'.$id, 86400, function () use ($id) {
            $collection = Collection::find($id);
            if (! $collection) {
                return false;
            }
            $account = AccountService::get($collection->profile_id);
            if (! $account) {
                return false;
            }

            return [
                'id' => (string) $collection->id,
                'pid' => (string) $collection->profile_id,
                'visibility' => $collection->visibility,
                'title' => $collection->title,
                'description' => $collection->description,
                'thumb' => url('/storage/no-preview.png'),
                'url' => $collection->url(),
                'updated_at' => $collection->updated_at,
                'published_at' => $collection->published_at,
            ];
        });

        if ($collection) {
            $account = AccountService::get($collection['pid']);
            if (! $account) {
                return false;
            }
            $collection['avatar'] = $account['avatar'];
            $collection['username'] = $account['username'];
            $collection['thumb'] = self::getThumb($id);
            $collection['post_count'] = self::count($id);
        }

        return $collection;
    }

    public static function setCollection($id, $collection)
    {
        $account = AccountService::get($collection->profile_id);
        if (! $account) {
            return false;
        }
        $res = [
            'id' => (string) $collection->id,
            'pid' => (string) $collection->profile_id,
            'visibility' => $collection->visibility,
            'title' => $collection->title,
            'description' => $collection->description,
            'thumb' => self::getThumb($id),
            'url' => $collection->url(),
            'updated_at' => $collection->updated_at,
            'published_at' => $collection->published_at,
        ];
        Cache::put(self::CACHE_KEY.'get:'.$id, $res, 86400);
        $res['avatar'] = $account['avatar'];
        $res['username'] = $account['username'];
        $res['post_count'] = self::count($id);

        return $res;
    }

    public static function deleteCollection($id)
    {
        Redis::del(self::CACHE_KEY.'items:'.$id);
        Cache::forget(self::CACHE_KEY.'get:'.$id);
    }

    public static function getThumb($id)
    {
        $item = self::getItems($id, 0, 1);
        if (! $item) {
            return url('/storage/no-preview.png');
        }
        $status = StatusService::get($item[0]);
        if (! $status) {
            return url('/storage/no-preview.png');
        }

        if (! isset($status['media_attachments']) || empty($status['media_attachments'])) {
            return url('/storage/no-preview.png');
        }

        return $status['media_attachments'][0]['url'];
    }
}
