<?php

namespace app\api\controller;

use think\Db;

/**
 * 优惠券：领券中心 / 我的券 / 领取
 */
class Coupon extends Base
{
    /**
     * 领券中心（可领取的券）
     */
    public function center()
    {
        $uid = $this->uid();
        $now = time();

        $list = Db::name('coupon')
            ->where('status', 'normal')
            ->where(function ($q) use ($now) {
                $q->where('end_time', 0)->whereOr('end_time', '>', $now);
            })
            ->order('amount desc,id desc')
            ->select();

        $receivedIds = Db::name('user_coupon')->where('user_id', $uid)->column('coupon_id');

        foreach ($list as &$row) {
            $row['amount'] = (float)$row['amount'];
            $row['min_amount'] = (float)$row['min_amount'];
            $row['discount'] = (float)$row['discount'];
            $row['total'] = (int)$row['total'];
            $row['received'] = (int)$row['received'];
            $row['received_by_me'] = in_array((int)$row['id'], array_map('intval', $receivedIds), true);
            $row['sold_out'] = $row['total'] > 0 && $row['received'] >= $row['total'];
            $row['time_text'] = (int)$row['end_time'] > 0 ? date('Y.m.d', (int)$row['end_time']) . ' 到期' : '长期有效';
            $row['value_text'] = $row['type'] === 'cash'
                ? ('¥' . (float)$row['amount'])
                : (rtrim(rtrim(number_format((float)$row['discount'] * 10, 1, '.', ''), '0'), '.') . ' 折');
            $row['rule_text'] = $row['min_amount'] > 0 ? ('满 ¥' . (float)$row['min_amount'] . ' 可用') : '无门槛';
        }
        unset($row);

        $this->success('', ['list' => $list]);
    }

    /**
     * 我的优惠券
     * @ApiParams (name="status", type="string", required=false, description="unused|used|expired")
     */
    public function my()
    {
        $status = $this->request->param('status', 'unused');
        if (!in_array($status, ['unused', 'used', 'expired'], true)) {
            $status = 'unused';
        }
        $uid = $this->uid();
        $now = time();

        $list = Db::name('user_coupon')->alias('uc')
            ->join('coupon c', 'c.id = uc.coupon_id', 'LEFT')
            ->field('uc.id,uc.status,uc.use_time,uc.createtime,c.name,c.type,c.amount,c.discount,c.min_amount,c.end_time')
            ->where('uc.user_id', $uid)
            ->where('uc.status', $status)
            ->order('uc.id desc')
            ->select();

        $counts = ['unused' => 0, 'used' => 0, 'expired' => 0];
        $all = Db::name('user_coupon')->where('user_id', $uid)->field('status,count(*) as c')->group('status')->select();
        foreach ($all as $r) {
            $counts[$r['status']] = (int)$r['c'];
        }

        foreach ($list as &$row) {
            $row['amount'] = (float)$row['amount'];
            $row['min_amount'] = (float)$row['min_amount'];
            $row['discount'] = (float)$row['discount'];
            $row['value_text'] = $row['type'] === 'cash'
                ? ('¥' . (float)$row['amount'])
                : (rtrim(rtrim(number_format((float)$row['discount'] * 10, 1, '.', ''), '0'), '.') . ' 折');
            $row['rule_text'] = $row['min_amount'] > 0 ? ('满 ¥' . (float)$row['min_amount'] . ' 可用') : '无门槛';
            $row['time_text'] = (int)$row['end_time'] > 0 ? ('有效期至 ' . date('Y.m.d', (int)$row['end_time'])) : '长期有效';
            $row['expired'] = (int)$row['end_time'] > 0 && (int)$row['end_time'] < $now;
        }
        unset($row);

        $this->success('', ['list' => $list, 'counts' => $counts]);
    }

    /**
     * 领取优惠券
     * @ApiMethod (POST)
     */
    public function receive()
    {
        $couponId = (int)$this->request->post('coupon_id');
        $coupon = Db::name('coupon')->where('id', $couponId)->where('status', 'normal')->find();
        if (!$coupon) {
            $this->error('优惠券不存在或已下架');
        }
        if ((int)$coupon['end_time'] > 0 && (int)$coupon['end_time'] < time()) {
            $this->error('优惠券已过期');
        }
        if ((int)$coupon['total'] > 0 && (int)$coupon['received'] >= (int)$coupon['total']) {
            $this->error('优惠券已被领完');
        }

        $has = Db::name('user_coupon')->where('user_id', $this->uid())->where('coupon_id', $couponId)->find();
        if ($has) {
            $this->error('您已领取过该优惠券');
        }

        Db::startTrans();
        try {
            Db::name('user_coupon')->insert([
                'user_id'    => $this->uid(),
                'coupon_id'  => $couponId,
                'status'     => 'unused',
                'createtime' => time(),
            ]);
            Db::name('coupon')->where('id', $couponId)->setInc('received');
            Db::commit();
        } catch (\Exception $e) {
            Db::rollback();
            $this->error('领取失败：' . $e->getMessage());
        }

        $this->notify('user', $this->uid(), '优惠券领取成功', '「' . $coupon['name'] . '」已放入我的优惠券', 'system', 0);
        $this->success('领取成功');
    }
}