<?php

namespace App\Http\Controllers\Api;
use App\Common\ProductStatus;
use App\Http\Controllers\Controller;
use App\Models\AgentProduct;
use App\Models\UserFav;
use App\Models\WaterfallAd;
use Illuminate\Support\Facades\Storage;

/**
 * 代理商产品
 * Class AgentProductController
 * @package App\Http\Controllers\Api
 */
class AgentProductController extends Controller
{
	// 代理商产品列表
	public function index()
	{
		$category_id = request()->input('category_id');
		if ($category_id) {
			$where['category_id'] = $category_id;
		}

		$where['agent_id'] = $this->agent_id;

		$list = AgentProduct::list()->where($where)->simplePaginate();
		$list = $this->paginatePicAddHost($list);
		$list = $this->insertAd($list);

		return $this->success($list);
	}

	// 产品详情
	public function show()
	{
		$id = (int)request()->input('id');

		// TODO 优惠券查询待优化
		$agent_product = AgentProduct::query()
			->with('product:id,title,pictures,know,stock,content')
			->with('coupon:tag,agent_product_id')
			->with('fav:agent_product_id')
			->whereHas('product', function ($query) {
				return $query->where('status', ProductStatus::ON_SALE)->where('stock', '>', 0);
			})
			->where('stock', '>', 0)
			->firstWhere(['id' => $id, 'agent_id' => $this->agent_id, 'status' => ProductStatus::ON_SALE]);

		if (!$agent_product) {
			return $this->error('产品不存在或已下架');
		}

		$prefix = Storage::disk('public')->url('');
		$agent_product->product->pictures = array_map(fn($item) => ($prefix . $item), $agent_product->product->pictures);

		$agent_product->is_collect = !is_null($agent_product->fav); //判断是否收藏
		//计算折扣
		if ($agent_product->price < $agent_product->original_price) {
			$agent_product->cost = round($agent_product->price / $agent_product->original_price * 10, 1);
		} else {
			$agent_product->cost = '';
		}

		unset($agent_product->agent_id, $agent_product->status, $agent_product->deleted_at);
		return $this->success($agent_product);
	}

	// 猜你喜欢
	public function guessLike()
	{
		// TODO 此处需要再优化排序规则，并增加广告功能
		return $this->index();
	}

	//【我的】页面下方推荐
	public function recommendList()
	{
		//TODO 推荐数据暂时使用产品列表，后期需要通过后台设置获取或根据用户购买过的关键词获取
		return $this->index();
	}

	//人气爆款列表
	public function hotList()
	{
		//TODO 具体排序规则，后期再做修改
		return $this->index();
	}

	//分页列表产品图片加域名
	private function paginatePicAddHost($list)
	{
		if (!$list->isEmpty()) {
			$prefix = Storage::disk('public')->url('');
			foreach ($list->items() as $k=>&$v) {
				$v->product->pictures = array_map(function($item) use ($prefix) {
					return strpos($item, $prefix) === false ? $prefix . $item : $item;
				}, $v->product->pictures);
			}
		}
		return $list;
	}

	//插入瀑布流广告
	private function insertAd($list)
	{
		//插入瀑布流广告，分别在第8个和第16个插入，同时需要考虑到分页。当所有瀑布流广告插入完之后，再次循环插入
		$list = $list->toArray();
		if ($list['data']) {
			$ad_total = WaterfallAd::where(['agent_id' => $this->agent_id, 'status' => 1])->count();

			$page = (int)request()->input('page');
			$start = ($page ? $page - 1 : 0) * 2 % $ad_total;

			$ad = WaterfallAd::where(['agent_id' => $this->agent_id, 'status' => 1])
				->orderBy('sort')->orderBy('id', 'DESC')
				->offset($start)->limit(2)->get(['title', 'picture', 'type', 'url'])->toArray();

			$prefix = Storage::disk('public')->url('');

			//每隔8个插入广告
			$gap = 4;
			foreach ($ad as $k => &$v) {
				$v['is_ad'] = true;
				$v['picture'] = $prefix . $v['picture'];

				//插入广告
				$temp = $gap * ($k+1);
				if (!empty($list['data'][$temp - 1]) && !empty($ad[$k])) {
					array_splice($list['data'], $temp + $k, 0, [$ad[$k]]);
				}
			}
		}
		return $list;
	}
}