<?php
namespace App\Http\Controllers\Admin\Inventory;
use App\Http\Controllers\Controller;
use App\Models\Inventory\TransferOrder;
use App\Models\Inventory\Inventory;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class TransferOrderController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $query = TransferOrder::query()
            ->with(['fromWarehouse', 'toWarehouse', 'operator'])
            ->when($request->transfer_no, fn($q, $v) => $q->where('transfer_no', 'like', "%{$v}%"))
            ->when($request->has('status'), fn($q) => $q->where('status', $request->status))
            ->when($request->from_warehouse_id, fn($q, $v) => $q->where('from_warehouse_id', $v));

        return $this->paginate($query->latest()->paginate($request->input('per_page', 15)));
    }

    public function store(Request $request): JsonResponse
    {
        $v = $request->validate([
            'transfer_no'       => 'required|string|max:50|unique:transfer_orders',
            'from_warehouse_id' => 'required|exists:warehouses,id',
            'to_warehouse_id'   => 'required|exists:warehouses,id|different:from_warehouse_id',
            'items'             => 'nullable|array',
            'remark'            => 'nullable|string|max:500',
        ]);
        $v['status'] = 0;
        $v['operator_id'] = auth()->id();

        return $this->success(TransferOrder::create($v));
    }

    public function show(TransferOrder $transferOrder): JsonResponse
    {
        return $this->success($transferOrder->load(['fromWarehouse', 'toWarehouse', 'operator']));
    }

    public function confirm(TransferOrder $transferOrder): JsonResponse
    {
        if ($transferOrder->status !== 0) {
            return $this->error('当前状态不可确认', 40001);
        }

        DB::transaction(function () use ($transferOrder) {
            $transferOrder->update(['status' => 1]);

            // 调拨：减源仓库、加目标仓库
            foreach (($transferOrder->items ?? []) as $item) {
                $materialId = $item['material_id'];
                $qty        = $item['quantity'] ?? 0;

                // 扣减出库仓库
                Inventory::where('warehouse_id', $transferOrder->from_warehouse_id)
                    ->where('material_id', $materialId)
                    ->decrement('quantity', $qty);

                // 增加入库仓库
                $inv = Inventory::firstOrCreate(
                    ['warehouse_id' => $transferOrder->to_warehouse_id, 'material_id' => $materialId, 'batch_no' => null],
                    ['quantity' => 0]
                );
                $inv->increment('quantity', $qty);
            }
        });

        return $this->success($transferOrder->fresh(['fromWarehouse', 'toWarehouse']));
    }

    public function cancel(TransferOrder $transferOrder): JsonResponse
    {
        if ($transferOrder->status !== 0) {
            return $this->error('只有待确认状态可取消', 40001);
        }
        $transferOrder->update(['status' => 2]);
        return $this->success($transferOrder);
    }
}