<?php

namespace App\Service\wx;

use App\BaseApp\BaseWxService;
use App\Models\business\ListItemModel;
use App\Models\business\ListModel;
use App\Service\business\PriceService;
use App\Service\business\SerialNoService;

/**
 * 小程序清单
 *
 * 清单是「加购物车」的语义但不含结算，下单由 WxOrderService 从清单快照生成。
 * 所有写操作都必须带 user_id 条件，否则改个 id 就能删别人的清单——老项目的 deleteItem 就是这个漏洞。
 */
class WxListService extends BaseWxService
{
    /**
     * 我的清单，带明细数量
     *
     * 兼容两种返回：
     * - 不传 page / pageSize（老调用方）：返回全量扁平数组，保持向后兼容；
     * - 传了 page / pageSize：返回 { items, total, page, pageSize, has_more }，供小程序真分页使用。
     * 判断「是否分页模式」只看请求里有没有 page，避免 pageSize 默认值造成歧义。
     */
    public function list(): array
    {
        // 请求里带了 page 才走分页分支；pageSize 缺省 20，与列表页约定一致
        $page = request()->get('page');
        $paged = $page !== null && $page !== '';
        $page = max(1, (int) $page);
        $pageSize = max(1, (int) (request()->get('pageSize') ?? 20));

        $base = ListModel::with([
            'items' => fn ($query) => $query->where('deleted_at', 0)->select(['id', 'list_id']),
        ])->where('user_id', $this->userId)
            ->where('deleted_at', 0)
            ->orderBy('id', 'desc');

        // 不分页：一次拿全，保持老结构
        if (!$paged) {
            $rows = $base->get();
            if ($rows->isEmpty()) {
                return [];
            }
            $rows = $rows->toArray();
            foreach ($rows as &$row) {
                $row['count'] = count($row['items'] ?? []);
            }
            unset($row);
            return $rows;
        }

        // 分页：拿当前页 + 总数，前端按 has_more 决定是否继续 loadMore
        $total = (clone $base)->count();
        $rows = $base->forPage($page, $pageSize)->get();
        $items = $rows->isEmpty() ? [] : $rows->toArray();
        foreach ($items as &$row) {
            $row['count'] = count($row['items'] ?? []);
        }
        unset($row);

        return [
            'items' => $items,
            'total' => $total,
            'page' => $page,
            'pageSize' => $pageSize,
            'has_more' => ($page * $pageSize) < $total,
        ];
    }

    /**
     * 清单详情：带商品与规格，价格按当前用户的可见性与倍率处理
     */
    public function detail(int $id): array
    {
        $info = ListModel::with([
            'items' => fn ($query) => $query->where('deleted_at', 0),
            'items.catalogue',
            'items.catalogue.priceSheet' => fn ($query) => $query->where('deleted_at', 0),
        ])->where('id', $id)
            ->where('user_id', $this->userId)
            ->where('deleted_at', 0)
            ->first();
        if (empty($info)) {
            $this->utils->errorThrow('清单不存在');
        }
        $info = $info->toArray();

        $price = PriceService::getInstance();
        $showPrice = $this->canSeePrice();
        $multiplier = $this->priceMultiplier();
        foreach ($info['items'] as &$item) {
            $sheet = $item['catalogue']['price_sheet'] ?? [];
            if (!empty($sheet)) {
                $applied = $price->applyToRows($sheet, $showPrice, $multiplier);
                $item['catalogue']['price_sheet'] = $applied['rows'];
            }
            // 老前端读的是 product 这个键名，保留别名避免小程序改字段
            $item['product'] = $item['catalogue'] ?? null;
        }
        unset($item);
        $info['is_show_price'] = $showPrice;
        return $info;
    }

    public function create(array $params): mixed
    {
        $name = trim((string) ($params['name'] ?? ''));
        if ($name === '') {
            $this->utils->errorThrow('请填写清单名称');
        }
        return ListModel::insertGetId([
            'list_no' => SerialNoService::getInstance()->generate(SerialNoService::PREFIX_LIST, 'list', 'list_no'),
            'user_id' => $this->userId,
            'name' => $name,
            'remark' => (string) ($params['remark'] ?? ''),
            'created_at' => time(),
        ]);
    }

    public function update(int $id, array $params): mixed
    {
        return ListModel::where('id', $id)->where('user_id', $this->userId)->update([
            'name' => (string) ($params['name'] ?? ''),
            'remark' => (string) ($params['remark'] ?? ''),
            'updated_at' => time(),
        ]);
    }

    public function delete(array|int $ids): mixed
    {
        return ListModel::whereIn('id', (array) $ids)
            ->where('user_id', $this->userId)
            ->update(['deleted_at' => time(), 'updated_at' => time()]);
    }

    /**
     * 删清单明细：先确认这些明细属于当前用户的清单
     */
    public function deleteItem(array|int $ids): mixed
    {
        $ids = (array) $ids;
        $listIds = ListModel::where('user_id', $this->userId)->where('deleted_at', 0)->pluck('id');
        return ListItemModel::whereIn('id', $ids)
            ->whereIn('list_id', $listIds)
            ->update(['deleted_at' => time(), 'updated_at' => time()]);
    }

    /**
     * 加入清单；同一清单同一商品同一规格只留一条，重复则累加数量
     */
    public function toCart(array $params): mixed
    {
        $listId = (int) ($params['list_id'] ?? 0);
        $catalogueId = (int) ($params['product_id'] ?? $params['catalogue_id'] ?? 0);
        if ($listId <= 0 || $catalogueId <= 0) {
            $this->utils->errorThrow('参数错误');
        }
        $list = ListModel::where('id', $listId)->where('user_id', $this->userId)->where('deleted_at', 0)->first();
        if (empty($list)) {
            $this->utils->errorThrow('清单不存在');
        }
        $priceSheetId = (int) ($params['price_sheet_id'] ?? 0);
        $quantity = max(1, (int) ($params['quantity'] ?? 1));

        $exists = ListItemModel::where('list_id', $listId)
            ->where('catalogue_id', $catalogueId)
            ->where('price_sheet_id', $priceSheetId)
            ->where('deleted_at', 0)
            ->first();
        if (!empty($exists)) {
            return ListItemModel::where('id', $exists['id'])->update([
                'quantity' => (int) $exists['quantity'] + $quantity,
                'updated_at' => time(),
            ]);
        }
        return ListItemModel::insertGetId([
            'list_id' => $listId,
            'catalogue_id' => $catalogueId,
            'price_sheet_id' => $priceSheetId,
            'material_key' => (string) ($params['material_key'] ?? 'routine'),
            'quantity' => $quantity,
            'remark' => (string) ($params['remark'] ?? ''),
            'created_at' => time(),
        ]);
    }

    /**
     * 改明细的规格与数量：转订单前用户要能在清单里补齐这些信息
     */
    public function updateItem(array $params): mixed
    {
        $itemId = (int) ($params['id'] ?? 0);
        if ($itemId <= 0) {
            $this->utils->errorThrow('参数错误');
        }
        $listIds = ListModel::where('user_id', $this->userId)->where('deleted_at', 0)->pluck('id');
        $update = ['updated_at' => time()];
        if (array_key_exists('quantity', $params)) {
            $update['quantity'] = max(1, (int) $params['quantity']);
        }
        if (array_key_exists('price_sheet_id', $params)) {
            $update['price_sheet_id'] = (int) $params['price_sheet_id'];
        }
        if (array_key_exists('material_key', $params)) {
            $update['material_key'] = (string) $params['material_key'];
        }
        if (array_key_exists('remark', $params)) {
            $update['remark'] = (string) $params['remark'];
        }
        return ListItemModel::where('id', $itemId)->whereIn('list_id', $listIds)->update($update);
    }
}