<?php

namespace Peidikeji\Order;

use Peidikeji\Coupon\CouponService;
use Peidikeji\Coupon\Models\UserCoupon;
use Peidikeji\Goods\Models\Goods;
use Peidikeji\Order\Events\OrderCreated;
use Peidikeji\Order\Exceptions\OrderException;
use Peidikeji\Order\Models\Order;
use Peidikeji\Setting\Models\Setting;

class OrderStore
{
    // 订单商品列表
    public $orderGoodsList;

    // 商品列表
    public $goodsList;

    // 下单用户
    public $user;

    // 订单总额/商品总额
    public $money;

    // 用户备注
    public $remarks;

    // amount: 使用积分, money: 积分抵扣金额, ratio: 抵扣比例
    public $score = ['amount' => 0, 'money' => 0, 'ratio' => 0];

    // address: 配送地址, money: 配送费, way: 配送方式
    public $ship = ['address' => null, 'money' => 0, 'way' => null];

    // 使用优惠券
    public $coupon = ['id' => null, 'money' => 0];

    public function __construct()
    {
        $this->orderGoodsList = collect();
    }

    public function user($user): static
    {
        $this->user = $user;

        return $this;
    }

    public function remarks($remarks): static
    {
        $this->remarks = $remarks;

        return $this;
    }

    /**
     * 购买商品
     *
     * @param array $params 商品参数 [{id, amount, spec: [{name, value}]}]
     * @throws OrderException
     */
    public function goods(array $params): static
    {
        $goodsList = Goods::show()->whereIn('id', array_column($params, 'id'))->get();
        if ($goodsList->count() === 0) {
            throw new OrderException('请选择有效商品');
        }

        $orderGoodsList = collect();
        foreach ($params as $item) {
            $goods = $goodsList->firstWhere('id', $item['id']);
            if (!$goods) {
                throw new OrderException('商品不存在');
            }
            if (! data_get($goods, 'on_sale')) {
                throw new OrderException($goods->name.' 未上架');
            }

            $stock = data_get($goods, 'stock');
            $orderGoods = [
                'goods_id' => data_get($goods, 'id'),
                'goods_name' => data_get($goods, 'name'),
                'goods_sn' => data_get($goods, 'goods_sn'),
                'cover_image' => data_get($goods, 'cover_image'),
                'price' => floatval(data_get($goods, 'price')),
                'attr' => data_get($goods, 'attr'),
                'spec' => data_get($item, 'spec'),
                'part' => data_get($item, 'part'),
                'amount' => data_get($item, 'amount', 1),
                'money' => 0,
            ];
            $spec = data_get($item, 'spec');
            if ($goods->spec) {
                if (!$spec) {
                    throw new OrderException('请选择 '.$goods->name.' 的规格');
                }
                $sku = $goods->skus()->jsonArray($item['spec'])->first();
                if (! $sku) {
                    throw new OrderException($goods->name.' 规格不存在');
                }
                $stock = $sku->stock;
                $orderGoods['goods_sku_id'] = $sku->id;
                $orderGoods['goods_sku_sn'] = $sku->sn;
                $orderGoods['price'] = floatval($sku->price);
            }

            if ($orderGoods['amount'] > $stock) {
                throw new OrderException($goods->name.' 库存不足');
            }

            $orderGoods['money'] = round($orderGoods['price'] * $orderGoods['amount'], 2, PHP_ROUND_HALF_DOWN);

            $orderGoodsList->push($orderGoods);
        }

        $this->goodsList = $goodsList;
        $this->orderGoodsList = $orderGoodsList;
        $this->money = $orderGoodsList->sum('money');

        return $this;
    }

    /**
     * 配送
     *
     * @param  string  $way 配送方式
     * @param  array  $address 地址 ['name' => '收货人', 'phone' => '18223350967', 'region' => ['重庆市', '重庆市', '渝北区'], 'zone' => [2221, 2222, 2234], 'address' => '线外城市花园3栋20楼'];
     */
    public function ship($way, $address = null)
    {
        $money = 0;
        $this->ship = ['way' => $way, 'address' => $address, 'money' => $money];

        return $this;
    }

    /**
     * 使用优惠券
     *
     * @param  UserCoupon  $info 优惠券领取记录
     */
    public function coupon(UserCoupon $info)
    {
        $info->canUse(true);
        $couponMoney = CouponService::make()->available($info, $this->orderGoodsList);
        if ($couponMoney === false) {
            throw new OrderException('优惠券不可用');
        }

        $this->coupon = ['id' => $info->id, 'money' => $couponMoney];
    }

    /**
     * 使用积分抵扣
     *
     * @param int $amount 积分数量
     * @param float|null $ratio 抵扣比例(0-1)
     * @param int|null $money 金额(默认 = $amount * $ratio)
     * @throws OrderException
     */
    public function score(int $amount, float $ratio = null, int $money = null): static
    {
        $user = $this->user;
        if ($amount > 0 && $user) {
            if ($user->balance < $amount) {
                throw new OrderException('用户积分不足');
            }
            // 积分抵扣比例: 1 积分 = ? 金额
            $ratio = 1;
            if ($money === null) {
                $money = $amount * $ratio;
            }
            $money = floor($money);

            $this->score = compact('money', 'amount', 'ratio');
        }

        return $this;
    }

    /**
     * 生成订单
     *
     * @return Order
     * @throws OrderException
     */
    public function create(): Order
    {
        $order = new Order([
            'sn' => OrderService::make()->generateSn(),
        ]);

        $order->user_id = $this->user?->id;
        $order->ship_address = $this->ship['address'];
        $order->ship_way = $this->ship['way'];
        $order->ship_money = $this->ship['money'];
        $order->user_remarks = $this->remarks;
        $order->total_money = $this->money;

        $order->score_discount_amount = $this->score['amount'];
        $order->score_discount_ratio = $this->score['ratio'];
        $order->score_discount_money = $this->score['money'];

        if ($this->coupon['id']) {
            $order->coupon_money = $this->coupon['money'];
            $order->coupon_id = $this->coupon['id'];
        }

        $order->pay_money = $this->getPayMoney();

        $order->save();
        $order->goods()->createMany($this->orderGoodsList);

        return $order;
    }

    /**
     * 获取付款金额
     *
     * @return float
     */
    public function getPayMoney()
    {
        $money = $this->money;

        // 积分抵扣
        $money -= $this->score['money'];

        // 优惠券抵扣
        $money -= $this->coupon['money'];

        // 配送费
        $money += $this->ship['money'];

        return max($money, 0);
    }

    public static function init(...$params): static
    {
        return new static(...$params);
    }
}