<?php


namespace App\Modules\Channel\Services;


use App\Modules\Channel\Models\ChannelRecommendBooks;

class ChannelRecommendBooksService
{

    static function getChannelBid($channel_id)
    {
        return ChannelRecommendBooks::where('channel_id',$channel_id)->orderBy('priority','DESC')->orderBy('created_at','DESC')->pluck('bid')->all();
    }

    static function getMergerBids($channel_id,$bid)
    {
        $bids = self::getChannelBid($channel_id);

        if(isset($bid) && $bid != 0){
            $key = array_keys($bids,$bid);
            if(!empty($key)){
                $value = 1;
                if(isset($bids[$key[0]+1])){
                    $bidArr[] = $bids[$key[0]+1];
                }else{
                    $bidArr[] = $bids[$value];
                    $value += 1;
                }
                if(isset($bids[$key[0]+2])){
                    $bidArr[] = $bids[$key[0]+2];
                }else{
                    $bidArr[] = $bids[$value-1];
                    $value += 1;
                }
                if(isset($bids[$key[0]+3])){
                    $bidArr[] = $bids[$key[0]+2];
                }else{
                    $bidArr[] = $bids[$value-1];
                }
            }else{
                $bidArr = [$bids[0],$bids[1],$bids[2]];
            }
        }else{
            $bidArr = [$bids[0],$bids[1],$bids[2]];
        }
        return $bidArr;
    }

    static function getRecommendBooks($channel_id,$bid = 0)
    {
        $bids = self::getMergerBids($channel_id,$bid);
        if(!isset($channel_id)) return [];
        $query = ChannelRecommendBooks::leftjoin('book_configs','book_configs.bid','channel_recommend_books.bid')
            ->leftjoin('books','books.id','channel_recommend_books.bid')
            ->select('books.intro','books.category_name','book_configs.book_name','book_configs.cover','book_configs.bid','channel_recommend_books.priority')
            ->orderBy('channel_recommend_books.priority','DESC')->orderBy('channel_recommend_books.created_at','DESC');

        $query->where('channel_recommend_books.channel_id',$channel_id)->whereIn('channel_recommend_books.bid',$bids);

        return $query->get()->toArray();
    }

    static function incrRecommendNum($channel_id,$bids)
    {
        return ChannelRecommendBooks::where('channel_id',$channel_id)->whereIn('bid',$bids)->increment('recommend_num');
    }
}