<?php

namespace App\Http\Controllers\Purchase;

use App\Exceptions\RepositoryException;
use App\Http\Requests\Purchase\PurchaseCellUpdateRequest;
use App\Http\Requests\Purchase\PurchaseRowUpdateRequest;
use App\Models\ProductModel;
use App\Models\PurchaseOrderModel;
use App\Models\StoreModel;
use App\Models\StoreOrderItemModel;
use App\Services\ExportService;
use App\Services\PurchaseEditService;
use App\Services\PurchaseGenerateService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Modules\AnnoRoute\Attribute\GetRoute;
use Modules\AnnoRoute\Attribute\PostRoute;
use Modules\AnnoRoute\Attribute\PutRoute;
use Modules\AnnoRoute\Attribute\RequestAttribute;
use Modules\Common\Http\Controllers\BaseController;
use Symfony\Component\HttpFoundation\Response;

/**
 * 采购单管理（C1 汇总生成 / C2-C3 导出 / C4 修改）
 * 采购单无独立明细表，明细直接溯源门店订货明细（store_order_item.purchase_id）
 */
#[RequestAttribute('/purchase/order', 'purchase.order')]
class PurchaseOrderController extends BaseController
{
    protected array $searchField = [
        'status' => '=',
        'purchase_no' => 'like',
        'purchase_date' => 'betweenDate',
    ];

    /** 采购单列表 */
    #[GetRoute(authorize: 'query')]
    public function query(Request $request): JsonResponse
    {
        $params = $request->all();
        $pageSize = $params['pageSize'] ?? 10;
        $data = $this->buildSearch($params, PurchaseOrderModel::query()->with('operator:id,nickname'))
            ->orderBy('purchase_date', 'desc')
            ->orderBy('id', 'desc')
            ->paginate($pageSize)
            ->toArray();
        return $this->success($data);
    }

    /**
     * 采购单详情：头 + 明细矩阵（商品行 × 门店列）
     * 行 = 商品（按分类 sort → 商品 sort 排序），列 = 商品信息 + 每个门店一格（数量/金额）
     */
    #[GetRoute(route: '/{id}', authorize: 'query', where: ['id' => '[0-9]+'])]
    public function detail(int $id): JsonResponse
    {
        $purchase = PurchaseOrderModel::with('operator:id,nickname')->find($id);
        if (empty($purchase)) {
            return $this->error('采购单不存在');
        }

        // 订货明细
        $orderItems = StoreOrderItemModel::query()
            ->join('store_order', 'store_order.id', '=', 'store_order_item.order_id')
            ->where('store_order_item.purchase_id', $purchase->id)
            ->whereNull('store_order.deleted_at')
            ->with('supplier:id,name')
            ->select('store_order_item.*')
            ->get()
            ->makeVisible('cost_price');

        // 门店列（含软删除门店，保证历史单据可见）
        $stores = StoreModel::withTrashed()
            ->whereIn('id', $orderItems->pluck('store_id')->unique())
            ->get(['id', 'name'])
            ->map(static fn (StoreModel $store) => ['id' => $store->id, 'name' => $store->name])
            ->values();

        // 排序键：分类 sort → 商品 sort
        $products = ProductModel::withTrashed()
            ->with('category:id,sort')
            ->whereIn('id', $orderItems->pluck('product_id')->unique())
            ->get()
            ->keyBy('id');

        $rows = [];
        foreach ($orderItems->groupBy('product_id') as $productId => $group) {
            $first = $group->first();
            // 商品
            $product = $products->get((int) $productId);
            // 采购总数
            $quantity = 0;
            // 采购总重量
            $weight = '0';
            // 门店明细
            $cellsMap  = [];

            foreach ($group as $item) {
                $storeId = $item->store_id;
                // 累加总量
                $quantity += (int) $item->quantity;
                $weight = bcadd($weight, (string) $item->weight, 3);

                // 按门店合并
                if (!isset($cellsMap[$storeId])) {
                    $cellsMap[$storeId] = 0;
                }

                $cellsMap[$storeId] += (int) $item->quantity;
            }

            // 供应商
            $supplier =  $first->supplier ? ['id' => $first->supplier->id, 'name' => $first->supplier->name] : null;
            $rows[] = [
                'product_id' => (int) $productId,
                'product_name' => $first->product_name,         // 品名
                'product_spec' => $first->product_spec,         // 包规
                'unit' => $first->unit,                         // 单位
                'supplier_id' => (int) $first->supplier_id,     // 供应商id
                'supplier' => $supplier,                        // 供应商
                'cost_price' => $first->cost_price,             // 成本价
                'quantity' => $quantity,
                'weight' => (float) $weight,
                'cells' => $cellsMap,
                'category_sort' => (int) ($product->category->sort ?? 9999),
                'product_sort' => (int) ($product->sort ?? 9999),
            ];
        }
        usort($rows, static fn (array $a, array $b): int =>
            [$a['category_sort'], $a['product_sort'], $a['product_id']]
            <=> [$b['category_sort'], $b['product_sort'], $b['product_id']]);

        return $this->success([
            'purchase' => $purchase->toArray(),
            'stores' => $stores->toArray(),
            'items' => array_map(static function (array $row): array {
                unset($row['category_sort'], $row['product_sort']);
                return $row;
            }, $rows),
        ]);
    }

    /** C4 修改采购单头信息（采购日期、状态、备注） */
    #[PutRoute(route: '/{id}', authorize: 'update', where: ['id' => '[0-9]+'])]
    public function update(int $id, Request $request): JsonResponse
    {
        $data = $request->validate([
            'purchase_date' => 'nullable|date_format:Y-m-d',
            'status' => 'nullable|integer|in:' . PurchaseOrderModel::STATUS_PENDING . ',' . PurchaseOrderModel::STATUS_COMPLETED,
            'remark' => 'nullable|string|max:255',
        ], [
            'purchase_date.date_format' => '采购日期格式为 Y-m-d',
            'status.in' => '采购单状态不正确',
        ]);
        $purchase = PurchaseOrderModel::find($id);
        if (empty($purchase)) {
            throw new RepositoryException('采购单不存在');
        }
        $purchase->update(array_filter($data, static fn ($v) => $v !== null));
        return $this->success();
    }

    /**
     * C1 生成采购单：合并全部「已接单」门店订单（或指定的 order_ids），
     * 生成后源订单转为「采购中」并回写 purchase_id（订单与订货明细同步归集）
     */
    #[PostRoute('/generate', 'generate')]
    public function generate(Request $request): JsonResponse
    {
        $data = $request->validate([
            'purchase_date' => 'required|date_format:Y-m-d',
            'order_ids' => 'sometimes|array|min:1',
            'order_ids.*' => 'integer|exists:store_order,id',
        ], [
            'purchase_date.required' => '请选择采购日期',
            'purchase_date.date_format' => '采购日期格式为 Y-m-d',
            'order_ids.min' => '请选择要合并的订单',
            'order_ids.*.exists' => '订单不存在',
        ]);

        $purchase = app(PurchaseGenerateService::class)->generate(
            $data['purchase_date'],
            (int) $request->user()->id,
            array_map('intval', $data['order_ids'] ?? []),
        );

        return $this->success(
            ['id' => $purchase->id, 'purchase_no' => $purchase->purchase_no],
            '采购单已生成'
        );
    }

    /** C2/C3 导出采购单：?type=all|category & format=xlsx|pdf */
    #[GetRoute(route: '/{id}/export', authorize: 'export', where: ['id' => '[0-9]+'])]
    public function export(int $id, Request $request): Response
    {
        $purchase = PurchaseOrderModel::find($id);
        if (empty($purchase)) {
            throw new RepositoryException('采购单不存在');
        }
        $type = (string) $request->query('type', 'all');
        if (! in_array($type, ['all', 'category'], true)) {
            throw new RepositoryException('导出类型参数不正确（all 全品类 / category 蔬果分类）');
        }

        return app(ExportService::class)->download(
            'purchase',
            $purchase,
            (string) $request->query('format', ExportService::FORMAT_XLSX),
            type: $type,
        );
    }

    /**
     * C4 门店单元格修改：数量/称重回写订货明细，金额重算并同步订单/采购单汇总
     */
    #[PutRoute(route: '/cell/{id}', authorize: 'update', where: ['id' => '[0-9]+'])]
    public function updateCell(int $id, PurchaseCellUpdateRequest $request): JsonResponse
    {
        $item = StoreOrderItemModel::find($id);
        if (empty($item)) {
            throw new RepositoryException('订货明细不存在');
        }
        $validated = $request->validated();

        $item = app(PurchaseEditService::class)->updateCell(
            $item,
            (int) $validated['quantity'],
            isset($validated['weight']) ? (float) $validated['weight'] : null,
        );

        return $this->success([
            'quantity' => (int) $item->quantity,
            'weight' => (float) $item->weight,
            'amount' => (float) $item->amount,
        ]);
    }

    /**
     * C4 商品行修改：采购成本同步该商品全部订货明细；实际称重按数量比例分摊（尾差修正守恒）
     */
    #[PutRoute(route: '/{id}/row/{productId}', authorize: 'update', where: ['id' => '[0-9]+', 'productId' => '[0-9]+'])]
    public function updateRow(int $id, int $productId, PurchaseRowUpdateRequest $request): JsonResponse
    {
        $purchase = PurchaseOrderModel::find($id);
        if (empty($purchase)) {
            throw new RepositoryException('采购单不存在');
        }
        $validated = $request->validated();
        $costPrice = isset($validated['cost_price']) ? (float) $validated['cost_price'] : null;
        $weight = isset($validated['weight']) ? (float) $validated['weight'] : null;
        if ($costPrice === null && $weight === null) {
            throw new RepositoryException('采购成本与实际称重至少填写一项');
        }

        $count = app(PurchaseEditService::class)->updateRow($purchase, $productId, $costPrice, $weight);

        return $this->success(['count' => $count], '已同步 ' . $count . ' 条订货明细');
    }
}