<?php

namespace App\Http\Controllers\Mini;

use App\Models\StoreOrderItemModel;
use App\Models\StoreOrderModel;
use Carbon\Carbon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Modules\AnnoRoute\Attribute\GetRoute;
use Modules\AnnoRoute\Attribute\RequestAttribute;

/**
 * 小程序运营报表（门店视角：采购金额汇总与单品占比）
 */
#[RequestAttribute('/mini', 'mini', authGuard: 'users')]
class ReportController extends BaseMiniController
{
    /**
     * 采购金额报表：选定周期内采购总金额 + 每个单品累计采购金额/占比
     *
     * ?preset=week|last_week|month|last_month 周期预设（默认 month 本月）；
     * ?start_date=&end_date= 自定义区间（Y-m-d，需成对出现，优先于 preset）。
     * 统计口径：本店订货单（排除已取消与后台已删除订单），金额=订货明细快照金额之和，
     * 单品按 product_id 聚合（品名/规格/单位取明细快照），按金额降序，占比保留 1 位小数（四舍五入）
     */
    #[GetRoute('/report/purchase', authorize: true)]
    public function purchase(Request $request): JsonResponse
    {
        $params = $request->validate([
            'preset' => 'nullable|string|in:week,last_week,month,last_month',
            'start_date' => 'required_with:end_date|nullable|date_format:Y-m-d',
            'end_date' => 'required_with:start_date|nullable|date_format:Y-m-d|after_or_equal:start_date',
        ], [
            'preset.in' => 'preset 参数只能是 week/last_week/month/last_month',
            'start_date.required_with' => '自定义区间需同时提供开始与结束日期',
            'end_date.required_with' => '自定义区间需同时提供开始与结束日期',
            'start_date.date_format' => '开始日期格式为 Y-m-d',
            'end_date.date_format' => '结束日期格式为 Y-m-d',
            'end_date.after_or_equal' => '结束日期不能早于开始日期',
        ]);

        $store = $this->currentStore($request);

        [$startDate, $endDate, $preset] = $this->resolveDateRange($params);

        // 明细联订货单：按订单日期/状态过滤（已取消、已删除订单不计入）
        $baseQuery = StoreOrderItemModel::query()
            ->join('store_order', static function ($join): void {
                $join->on('store_order.id', '=', 'store_order_item.order_id')
                    ->whereNull('store_order.deleted_at');
            })
            ->where('store_order_item.store_id', $store->id)
            ->where('store_order.status', '<>', StoreOrderModel::STATUS_CANCELLED)
            ->whereDate('store_order.order_date', '>=', $startDate)
            ->whereDate('store_order.order_date', '<=', $endDate);

        $totals = (clone $baseQuery)
            ->selectRaw('COALESCE(SUM(store_order_item.amount), 0) as total_amount')
            ->selectRaw('COALESCE(SUM(store_order_item.quantity), 0) as total_quantity')
            ->selectRaw('COUNT(DISTINCT store_order_item.order_id) as order_count')
            ->first();

        $totalAmount = bcadd((string) $totals->total_amount, '0', 2);

        $rows = (clone $baseQuery)
            ->select('store_order_item.product_id')
            ->selectRaw('MAX(store_order_item.product_name) as product_name')
            ->selectRaw('MAX(store_order_item.product_spec) as product_spec')
            ->selectRaw('MAX(store_order_item.unit) as unit')
            ->selectRaw('COALESCE(SUM(store_order_item.quantity), 0) as quantity')
            ->selectRaw('COALESCE(SUM(store_order_item.weight), 0) as weight')
            ->selectRaw('COALESCE(SUM(store_order_item.amount), 0) as amount')
            ->groupBy('store_order_item.product_id')
            ->orderByDesc('amount')
            ->orderBy('store_order_item.product_id')
            ->get();

        $items = $rows->map(static function (StoreOrderItemModel $row) use ($totalAmount): array {
            // 占比 %（1 位小数，四舍五入）：tenths = round(amount × 1000 ÷ total)，再 ÷10
            $percent = 0.0;
            if (bccomp($totalAmount, '0', 2) > 0) {
                $tenths = bcdiv(
                    bcadd(bcmul((string) $row->amount, '1000', 2), bcdiv($totalAmount, '2', 0), 2),
                    $totalAmount,
                    0
                );
                $percent = (float) bcdiv($tenths, '10', 1);
            }

            return [
                'product_id' => (int) $row->product_id,
                'product_name' => (string) $row->product_name,
                'product_spec' => (string) $row->product_spec,
                'unit' => (string) $row->unit,
                'quantity' => (int) $row->quantity,
                'weight' => bcadd((string) $row->weight, '0', 3),
                'amount' => bcadd((string) $row->amount, '0', 2),
                'percent' => $percent,
            ];
        })->values()->all();

        return $this->success([
            'preset' => $preset,
            'start_date' => $startDate,
            'end_date' => $endDate,
            'total_amount' => $totalAmount,
            'total_quantity' => (int) $totals->total_quantity,
            'order_count' => (int) $totals->order_count,
            'item_count' => count($items),
            'items' => $items,
        ]);
    }

    /**
     * 解析统计区间：自定义日期优先；否则按 preset 推导（进行中的周期封顶到今天）
     *
     * @param array{preset?: ?string, start_date?: ?string, end_date?: ?string} $params
     * @return array{0: string, 1: string, 2: string} [开始日期, 结束日期, 实际 preset]
     */
    private function resolveDateRange(array $params): array
    {
        if (! empty($params['start_date']) && ! empty($params['end_date'])) {
            return [$params['start_date'], $params['end_date'], 'custom'];
        }

        $preset = (string) ($params['preset'] ?? 'month');
        $today = Carbon::today();
        [$start, $end] = match ($preset) {
            'week' => [$today->copy()->startOfWeek(), $today->copy()->endOfWeek()],
            'last_week' => [$today->copy()->subWeek()->startOfWeek(), $today->copy()->subWeek()->endOfWeek()],
            'last_month' => [$today->copy()->subMonthNoOverflow()->startOfMonth(), $today->copy()->subMonthNoOverflow()->endOfMonth()],
            default => [$today->copy()->startOfMonth(), $today->copy()->endOfMonth()],
        };
        // 未来日期本无数据，封顶到今天避免误解
        if ($end->greaterThan($today)) {
            $end = $today->copy();
        }

        return [$start->toDateString(), $end->toDateString(), $preset];
    }
}