<?php

namespace App\Http\Controllers\Member;

use App\Models\Cart;
use App\Models\YiiModels\Drug;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\Relation;

/**
 * 购物车
 */
class CartController extends MemberBaseController
{
    /**
     * 添加购物车
     *
     * @return void
     */
    public function cartAdd()
    {
        $input = $this->toValidator([
            'drug_id' => 'required|integer',
            'change_qty' => 'nullable|integer',
            'true_qty' => 'nullable|integer',
        ], [], [
            'drug_id' => '商品',
            'change_qty' => '数量',
            'true_qty' => '数量',
        ], true);

        if (!$input['change_qty'] && !$input['true_qty']) {
            json_error('商品数量不正确');
        }

        /* @var Drug $drug */
        $drug = Drug::with([
            'drugStoreRelation' => function (Relation $relation) {
                $relation->select(['drug_id', 'total_sales_volume', 'status'])
                    ->where('store_id', $this->getStoreId());
            },
            'drugstoreDrug' => function (Relation $relation) {
                $relation->select(['drug_id', 'price', 'stock'])
                    ->where('drugstore_id', $this->getDrugstoreId());
            },
        ])
            ->select([
                'id', 'status',
            ])
            ->whereHasIn('drugStoreRelation', function (Builder $builder) {
                $builder->where('store_id', $this->getStoreId());
            })
            ->where('id', $input['drug_id'])
            ->first();
        if (!$drug && !$drug->drugStoreRelation && !$drug->drugstoreDrug) {
            json_error('商品不存在');
        }
        if ($drug->status != Drug::STATUS_ON || $drug->drugStoreRelation->status != Drug::STATUS_ON) {
            json_error('商品已下架');
        }
        $cart = $this->user()->carts()->firstOrCreate([
            'drug_id' => $input['drug_id'],
            'store_id' => $this->getStoreId(),
        ]);
        if ($input['change_qty']) {
            if ($input['change_qty'] > $drug->drugstoreDrug->stock) {
                json_error("库存不足，最多可加入{$drug->drugstoreDrug->stock}个");
            }
            $cart->increment('qty', $input['change_qty'], ['join_at' => now()]);
            if ($cart->qty <= 0) {
                $cart->delete();
                json_success('购物车商品已删除');
            }
        } else {
            if (($input['true_qty'] - $cart['qty']) > $drug->drugstoreDrug->stock) {
                json_error("库存不足，最多可加入{$drug->drugstoreDrug->stock}个");
            }
            $cart->update([
                'qty' => $input['true_qty'],
                'join_at' => now(),
            ]);
            if ($cart->qty <= 0) {
                $cart->delete();
                json_success('购物车商品已删除');
            }
        }
        json_success('已加入购物车');
    }

    /**
     * 清空购物车
     *
     * @return void
     */
    public function clearAll()
    {
        Cart::where('store_id', $this->getStoreId())
            ->where('user_id', $this->userId())
            ->delete();
        json_success('已清空购物车');
    }

    /**
     * 购物车列表
     *
     * @return void
     */
    public function cartLists()
    {
        $carts = Cart::with([
            'drug' => function (Relation $relation) {
                $relation->with([
                    'drugStoreRelation' => function (Relation $relation) {
                        $relation->select(['drug_id', 'total_sales_volume', 'status'])
                            ->where('store_id', $this->getStoreId());
                    },
                    'drugstoreDrug' => function (Relation $relation) {
                        $relation->select(['drug_id', 'price', 'stock'])
                            ->where('drugstore_id', $this->getDrugstoreId());
                    },
                ])
                    ->select(['id', 'drug_name', 'source', 'type', 'is_otc', 'small_info', 'usage', 'specification', 'image', 'status']);
            }
        ])
            ->whereHasIn('drug')
            ->where('store_id', $this->getStoreId())
            ->where('user_id', $this->userId())
            ->orderByDesc('join_at')
            ->get();

        $valid = $invalid = [];
        /* @var Cart $cart */
        foreach ($carts as $cart) {
            if (!$cart->drug || !$cart->drug->drugStoreRelation || !$cart->drug->drugstoreDrug) {
                $invalid[] = $cart;
                continue;
            }
            if ($cart->drug->status != Drug::STATUS_ON || $cart->drug->drugStoreRelation->status != Drug::STATUS_ON) {
                $invalid[] = $cart;
                continue;
            }
            $valid[] = $cart;
        }

        json_success([
            'store_name' => $this->getStore()->name,
            'valid' => $valid,
            'invalid' => $invalid,
        ]);
    }
}