<?php
namespace App\Http\Controllers;

use App\Models\Platform;
use App\Models\PlatformSkuBinding;
use App\Models\ErpSku;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class PlatformProductController extends Controller
{
    /**
     * 平台商品列表（包含绑定状态）
     */
    public function index(Request $request)
    {
        $query = Platform::with(['activeBinding.erpSku']);

        if ($request->filled('shop_auth_id')) {
            $query->where('shop_auth_id', $request->shop_auth_id);
        }
        if ($request->filled('sku_code')) {
            $query->where('sku_code', 'like', "%{$request->sku_code}%");
        }
        if ($request->filled('title')) {
            $query->where('title', 'like', "%{$request->title}%");
        }
        if ($request->filled('binding_status')) {
            if ($request->binding_status === 'bound') {
                $query->whereHas('activeBinding');
            } elseif ($request->binding_status === 'unbound') {
                $query->whereDoesntHave('activeBinding');
            }
        }

        $perPage = $request->input('limit', 15);
        $platforms = $query->orderBy('updated_at', 'desc')->paginate($perPage);

        // 格式化数据
        $platforms->getCollection()->transform(function ($platform) {
            return [
                'id' => $platform->id,
                'shop_auth_id' => $platform->shop_auth_id,
                'platform_product_id' => $platform->platform_product_id,
                'platform_sku_id' => $platform->platform_sku_id,
                'sku_code' => $platform->sku_code,
                'title' => $platform->title,
                'price' => $platform->price,
                'specs' => $platform->specs,
                'status' => $platform->status,
                'bound_erp_sku' => $platform->activeBinding ? [
                    'id' => $platform->activeBinding->erpSku->id,
                    'sku_code' => $platform->activeBinding->erpSku->sku_code,
                    'name' => $platform->activeBinding->erpSku->name,
                ] : null,
                'last_sync_at' => $platform->last_sync_at,
            ];
        });

        return response()->json([
            'code' => 200,
            'data' => [
                'list' => $platforms->items(),
                'total' => $platforms->total(),
                'current_page' => $platforms->currentPage(),
                'last_page' => $platforms->lastPage(),
            ],
            'message' => 'success'
        ]);
    }

    /**
     * 绑定ERP商品
     */
    public function bind(Request $request, $id)
    {
        $request->validate([
            'erp_sku_id' => 'required|exists:erp_skus,id',
        ]);

        $platform = Platform::findOrFail($id);

        // 将之前生效的绑定置为无效
        DB::transaction(function () use ($platform, $request) {
            $platform->activeBinding()?->update([
                'is_active' => false,
                'unbound_at' => now(),
                'reason' => '手动重新绑定'
            ]);

            // 创建新绑定
            PlatformSkuBinding::create([
                'platform_sku_id' => $platform->id,
                'erp_sku_id' => $request->erp_sku_id,
                'is_active' => true,
                'bound_at' => now(),
            ]);
        });

        // 可选：异步重新匹配所有包含此平台SKU的订单
        // dispatch(new RematchOrdersForPlatformSku($platform->sku_code));

        return response()->json([
            'code' => 200,
            'message' => '绑定成功'
        ]);
    }

    /**
     * 同步平台商品（模拟）
     * 实际开发中应调用平台API获取最新商品信息，并检测变化
     */
    public function sync(Request $request)
    {
        $request->validate([
            'shop_auth_id' => 'required|exists:shop_auths,id',
        ]);

        // 模拟从平台拉取最新商品数据
        $mockPlatformSkus = [
            [
                'platform_product_id' => '123456',
                'platform_sku_id' => '789012',
                'sku_code' => 'SKU001',
                'title' => '测试商品1',
                'price' => 99.50,
                'specs' => ['颜色' => '红色', '尺寸' => 'M'],
                // ...
            ],
            // 更多商品...
        ];

        $updatedCount = 0;
        $newCount = 0;

        foreach ($mockPlatformSkus as $data) {
            $platform = Platform::where('shop_auth_id', $request->shop_auth_id)
                ->where('platform_product_id', $data['platform_product_id'])
                ->where('platform_sku_id', $data['platform_sku_id'])
                ->first();

            if ($platform) {
                // 检查商品信息是否有变化（比较关键字段）
                $changed = false;
                if ($platform->title !== $data['title'] || $platform->price != $data['price'] || json_encode($platform->specs) !== json_encode($data['specs'])) {
                    $changed = true;
                }

                // 更新平台商品信息
                $platform->update([
                    'title' => $data['title'],
                    'price' => $data['price'],
                    'specs' => $data['specs'],
                    'last_sync_at' => now(),
                ]);

                if ($changed) {
                    // 将当前生效的绑定作废
                    $platform->activeBinding()?->update([
                        'is_active' => false,
                        'unbound_at' => now(),
                        'reason' => '平台商品信息更新'
                    ]);
                    $updatedCount++;
                }
            } else {
                // 新增平台商品
                Platform::create([
                    'shop_auth_id' => $request->shop_auth_id,
                    'platform_product_id' => $data['platform_product_id'],
                    'platform_sku_id' => $data['platform_sku_id'],
                    'sku_code' => $data['sku_code'],
                    'title' => $data['title'],
                    'price' => $data['price'],
                    'specs' => $data['specs'],
                    'last_sync_at' => now(),
                ]);
                $newCount++;
            }
        }

        return response()->json([
            'code' => 200,
            'data' => [
                'new' => $newCount,
                'updated' => $updatedCount,
            ],
            'message' => '同步完成'
        ]);
    }

    /**
     * 获取单个平台商品详情（包含绑定历史）
     */
    public function show($id)
    {
        $platform = Platform::with(['skuBindings.erpSku'])->findOrFail($id);

        $data = [
            'id' => $platform->id,
            'shop_auth_id' => $platform->shop_auth_id,
            'platform_product_id' => $platform->platform_product_id,
            'platform_sku_id' => $platform->platform_sku_id,
            'sku_code' => $platform->sku_code,
            'title' => $platform->title,
            'price' => $platform->price,
            'specs' => $platform->specs,
            'status' => $platform->status,
            'current_binding' => $platform->activeBinding ? [
                'erp_sku_id' => $platform->activeBinding->erpSku->id,
                'sku_code' => $platform->activeBinding->erpSku->sku_code,
                'name' => $platform->activeBinding->erpSku->name,
                'bound_at' => $platform->activeBinding->bound_at,
            ] : null,
            'binding_history' => $platform->skuBindings->map(function ($binding) {
                return [
                    'erp_sku' => $binding->erpSku ? [
                        'id' => $binding->erpSku->id,
                        'sku_code' => $binding->erpSku->sku_code,
                        'name' => $binding->erpSku->name,
                    ] : null,
                    'is_active' => $binding->is_active,
                    'bound_at' => $binding->bound_at,
                    'unbound_at' => $binding->unbound_at,
                    'reason' => $binding->reason,
                ];
            }),
            'last_sync_at' => $platform->last_sync_at,
        ];

        return response()->json([
            'code' => 200,
            'data' => $data,
            'message' => 'success'
        ]);
    }
}