<?php

namespace app\admin\controller;

use app\common\controller\Backend;
use think\Db;

/**
 * 优惠券模板管理
 *
 * @icon fa fa-ticket
 */
class Coupon extends Backend
{
    /**
     * Coupon模型对象
     * @var \app\admin\model\Coupon
     */
    protected $model = null;
    protected $searchFields = 'id,name';

    public function _initialize()
    {
        parent::_initialize();
        $this->model = new \app\admin\model\Coupon;
        $this->view->assign("typeList", $this->model->getTypeList());
        $this->view->assign("statusList", $this->model->getStatusList());
    }

    /**
     * 优惠券模板列表（聚合真实领取张数与核销使用张数）
     */
    public function index()
    {
        $this->request->filter(['strip_tags', 'trim']);
        if (false === $this->request->isAjax()) {
            return $this->view->fetch();
        }
        if ($this->request->request('keyField')) {
            return $this->selectpage();
        }
        [$where, $sort, $order, $offset, $limit] = $this->buildparams();
        $list = $this->model
            ->where($where)
            ->order($sort, $order)
            ->paginate($limit);

        $rows = $list->items();
        $ids = [];
        foreach ($rows as $r) {
            $ids[] = (int)$r['id'];
        }

        $claimMap = [];
        $usedMap = [];
        if ($ids) {
            $stats = Db::name('user_coupon')
                ->where('coupon_id', 'in', $ids)
                ->field('coupon_id, COUNT(*) AS claim_cnt, SUM(CASE WHEN status = \'used\' THEN 1 ELSE 0 END) AS used_cnt')
                ->group('coupon_id')
                ->select();
            foreach ($stats as $st) {
                $cid = (int)$st['coupon_id'];
                $claimMap[$cid] = (int)$st['claim_cnt'];
                $usedMap[$cid] = (int)$st['used_cnt'];
            }
        }

        foreach ($rows as &$item) {
            $cid = (int)$item['id'];
            $item['real_claimed'] = max((int)$item['received'], $claimMap[$cid] ?? 0);
            $item['used_count'] = $usedMap[$cid] ?? 0;
        }
        unset($item);

        return json(['total' => $list->total(), 'rows' => $rows]);
    }

    /**
     * 优惠券领用与核销全景详情（关联 fa_user_coupon + fa_user + fa_order）
     */
    public function detail($ids = null)
    {
        $row = $this->model->get($ids);
        if (!$row) {
            $this->error(__('No Results were found'));
        }
        $cid = (int)$row['id'];
        $totalClaimed = (int)Db::name('user_coupon')->where('coupon_id', $cid)->count();
        $totalUsed = (int)Db::name('user_coupon')->where('coupon_id', $cid)->where('status', 'used')->count();

        $records = Db::name('user_coupon')->alias('uc')
            ->join('__USER__ u', 'u.id = uc.user_id', 'LEFT')
            ->join('__ORDER__ o', 'o.id = uc.order_id', 'LEFT')
            ->where('uc.coupon_id', $cid)
            ->field('uc.*, u.nickname, u.username, u.mobile, o.order_no, o.service_name, o.pay_amount, o.discount_amount')
            ->order('uc.id desc')
            ->limit(30)
            ->select();

        $drivenGmv = (float)Db::name('user_coupon')->alias('uc')
            ->join('__ORDER__ o', 'o.id = uc.order_id', 'INNER')
            ->where('uc.coupon_id', $cid)
            ->where('uc.status', 'used')
            ->sum('o.pay_amount');

        $this->view->assign([
            'row'          => $row,
            'totalClaimed' => max((int)$row['received'], $totalClaimed),
            'totalUsed'    => $totalUsed,
            'drivenGmv'    => round($drivenGmv, 2),
            'records'      => $records,
        ]);
        return $this->view->fetch();
    }

    /**
     * 新增卡券模板（强制初始化已领取数为 0）
     */
    public function add()
    {
        if (false === $this->request->isPost()) {
            return $this->view->fetch();
        }
        $params = $this->request->post('row/a', []);
        if (!$params) {
            $this->error(__('Parameter %s can not be empty', ''));
        }
        $params = $this->preExcludeFields($params);
        $params['received'] = 0;
        if (($params['type'] ?? 'cash') === 'discount') {
            $disc = (float)($params['discount'] ?? 0);
            if ($disc <= 0 || $disc >= 1) {
                $this->error('折扣券的折扣系数须大于 0 且小于 1（如 0.85 表示 8.5 折）');
            }
            $params['amount'] = 0.00;
        } else {
            if ((float)($params['amount'] ?? 0) <= 0) {
                $this->error('满减代金券的减免金额须大于 0');
            }
            $params['discount'] = 1.00;
        }
        $result = $this->model->allowField(true)->save($params);
        if ($result !== false) {
            $this->success();
        }
        $this->error($this->model->getError() ?: __('No rows were inserted'));
    }

    /**
     * 编辑卡券模板（锁定已领取数量防止人工篡改库存）
     */
    public function edit($ids = null)
    {
        $row = $this->model->get($ids);
        if (!$row) {
            $this->error(__('No Results were found'));
        }
        if (false === $this->request->isPost()) {
            $this->view->assign('row', $row);
            return $this->view->fetch();
        }
        $params = $this->request->post('row/a', []);
        if (!$params) {
            $this->error(__('Parameter %s can not be empty', ''));
        }
        $params = $this->preExcludeFields($params);
        unset($params['received']);
        if (($params['type'] ?? $row['type']) === 'discount') {
            $disc = (float)($params['discount'] ?? $row['discount']);
            if ($disc <= 0 || $disc >= 1) {
                $this->error('折扣券的折扣系数须大于 0 且小于 1（如 0.85 表示 8.5 折）');
            }
            $params['amount'] = 0.00;
        } else {
            if ((float)($params['amount'] ?? $row['amount']) <= 0) {
                $this->error('满减代金券的减免金额须大于 0');
            }
            $params['discount'] = 1.00;
        }
        $result = $row->allowField(true)->save($params);
        if ($result !== false) {
            $this->success();
        }
        $this->error($row->getError() ?: __('No rows were updated'));
    }

    /**
     * 删除保护：已有用户领取的卡券禁止物理删除
     */
    public function del($ids = null)
    {
        if (false === $this->request->isPost()) {
            $this->error(__('Invalid parameters'));
        }
        $ids = $ids ?: $this->request->post('ids');
        $idArr = array_values(array_filter(array_map('intval', explode(',', (string)$ids))));
        if (!$idArr) {
            $this->error(__('Parameter %s can not be empty', 'ids'));
        }
        $claimedCnt = (int)Db::name('user_coupon')->where('coupon_id', 'in', $idArr)->count();
        if ($claimedCnt > 0) {
            $this->error('所选优惠券已有用户领取记录（共 ' . $claimedCnt . ' 张），禁止物理删除，请改为「隐藏」停止发放');
        }
        return parent::del($ids);
    }
}