<?php

namespace App\Modules\Inventory\Controllers;

use App\Http\Controllers\Controller;
use App\Modules\Inventory\Services\GoodsReceiptService;
use App\Modules\Inventory\Services\InventoryService;
use App\Modules\Procurement\Contracts\ProcurementServiceInterface;
use Illuminate\Http\Request;
use Inertia\Inertia;
use App\Modules\Inventory\Models\GoodsReceipt;

class GoodsReceiptController extends Controller
{
    protected $goodsReceiptService;
    protected $inventoryService;
    protected $procurementService;

    public function __construct(
        GoodsReceiptService $goodsReceiptService,
        InventoryService $inventoryService,
        ProcurementServiceInterface $procurementService
    ) {
        $this->goodsReceiptService = $goodsReceiptService;
        $this->inventoryService = $inventoryService;
        $this->procurementService = $procurementService;
    }

    public function index(Request $request)
    {
        $query = GoodsReceipt::query()
            ->with(['warehouse']); // Vendor info might need fetching separately or stored as snapshot if cross-module strict

        if ($request->has('search')) {
            $search = $request->input('search');
            $query->where('code', 'like', "%{$search}%");
        }

        $receipts = $query->orderBy('created_at', 'desc')
            ->paginate(10)
            ->withQueryString();

        // Hydrate Vendor Names (Manual hydration to avoid cross-module relation)
        // Or if we stored vendor_name in DB, we could use that.
        // For now, let's fetch vendors via Service if needed, or just let frontend handle it if we passed IDs?
        // Let's implement hydration properly.
        $vendorIds = $receipts->pluck('vendor_id')->unique()->toArray();
        if (!empty($vendorIds)) {
            // Check if ProcurementService has getVendorsByIds? No directly exposed method in interface yet.
            // Let's assume we can add it or just fetch POs to get vendors?
            // Actually, for simplicity and performance in Strict Mode, often we just fetch minimal data.
            // Or we can use `App\Modules\Procurement\Models\Vendor` directly ONLY for reading if allowed, but strict mode says NO.
            // But we don't have getVendorsByIds in interface.
            // User requirement: "從採購單帶入".
            // Let's just pass IDs for now, or use a method if available.
            // Wait, I can't modify Interface easily without user approval if it's big change.
            // But I just added updateReceivedQuantity.
            // Let's skip vendor name hydration for index for a moment and focus on Create first, or use a direct DB query via a DTO service?
            // Actually, I can use `DB::table('vendors')` as a workaround if needed, but that's dirty.
            // Let's revisit Service Interface.
        }
        
        // Quick fix: Add `vendor` relation to GoodsReceipt only if we decided to allow it or if we stored snapshot.
        // Plan said: `vendor_id`: foreignId.
        // Ideally we should have stored `vendor_name` in `goods_receipts` table for snapshot.
        // I didn't add it in migration.
        // Let's rely on `ProcurementServiceInterface` to get vendor info if possible.
        // I will add a method to get Vendors or POs.

        return Inertia::render('Inventory/GoodsReceipt/Index', [
            'receipts' => $receipts,
            'filters' => $request->only(['search']),
        ]);
    }

    public function create()
    {
        return Inertia::render('Inventory/GoodsReceipt/Create', [
            'warehouses' => $this->inventoryService->getAllWarehouses(),
            // Vendors? We need to select PO, not Vendor directly maybe?
            // Designing the UI: Select PO -> fills Vendor and Items.
            // So we need a way to search POs by code or vendor.
            // We can provide an API for searching POs.
        ]);
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'warehouse_id' => 'required|exists:warehouses,id',
            'type' => 'required|in:standard,miscellaneous,other',
            'purchase_order_id' => 'nullable|required_if:type,standard|exists:purchase_orders,id',
            // Vendor ID is required if standard, but optional/nullable for misc/other? 
            // Stick to existing logic: if standard, we infer vendor from PO usually, or frontend sends it.
            // For now let's make vendor_id optional for misc/other or user must select one?
            // "雜項入庫" might not have a vendor. Let's make it nullable.
            'vendor_id' => 'nullable|integer',
            'received_date' => 'required|date',
            'remarks' => 'nullable|string',
            'items' => 'required|array|min:1',
            'items.*.product_id' => 'required|integer|exists:products,id',
            'items.*.purchase_order_item_id' => 'nullable|required_if:type,standard|integer',
            'items.*.quantity_received' => 'required|numeric|min:0',
            'items.*.unit_price' => 'required|numeric|min:0',
            'items.*.batch_number' => 'nullable|string',
            'items.*.expiry_date' => 'nullable|date',
        ]);

        $this->goodsReceiptService->store($validated);

        return redirect()->route('goods-receipts.index')->with('success', '進貨單已建立');
    }

    // API to search POs
    public function searchPOs(Request $request)
    {
        $search = $request->input('query');
        if (!$search) {
            return response()->json([]);
        }

        $pos = $this->procurementService->searchPendingPurchaseOrders($search);
        
        return response()->json($pos);
    }

    // API to search Products for Manual Entry
    public function searchProducts(Request $request)
    {
        $search = $request->input('query');
        if (!$search) {
            return response()->json([]);
        }

        $products = $this->inventoryService->getProductsByName($search);
        
        // Format for frontend
        $mapped = $products->map(function($product) {
            return [
                'id' => $product->id,
                'name' => $product->name,
                'code' => $product->code,
                'unit' => $product->unit, // Ensure unit is included
                'price' => $product->purchase_price ?? 0, // Suggest price from product info if available
            ];
        });

        return response()->json($mapped);
    }

    // API to search Vendors
    public function searchVendors(Request $request)
    {
        $search = $request->input('query');
        if (!$search) {
            return response()->json([]);
        }

        $vendors = $this->procurementService->searchVendors($search);
        
        return response()->json($vendors);
    }
}