<?php

namespace App\Modules\Core\Controllers;

use App\Http\Controllers\Controller;

use App\Modules\Inventory\Contracts\InventoryServiceInterface;
use App\Modules\Procurement\Contracts\ProcurementServiceInterface;
use Inertia\Inertia;
use Illuminate\Http\Request;

class DashboardController extends Controller
{
    protected $inventoryService;
    protected $procurementService;

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

    public function index()
    {
        $centralDomains = config('tenancy.central_domains', []);

        $demoPort = config('tenancy.demo_tenant_port');
        if ((!$demoPort || request()->getPort() != $demoPort) && in_array(request()->getHost(), $centralDomains)) {
            return redirect()->route('landlord.dashboard');
        }

        $invStats = $this->inventoryService->getDashboardStats();
        $procStats = $this->procurementService->getDashboardStats();

        // 銷售統計 (本月營收)
        $thisMonthRevenue = \App\Modules\Sales\Models\SalesImportItem::whereMonth('transaction_at', now()->month)
            ->whereYear('transaction_at', now()->year)
            ->sum('amount');

        // 生產統計 (待核准工單)
        $pendingProductionCount = \App\Modules\Production\Models\ProductionOrder::where('status', 'pending')->count();
        
        // 生產狀態分佈
        // 近30日銷售趨勢 (Area Chart)
        $startDate = now()->subDays(29)->startOfDay();
        $salesData = \App\Modules\Sales\Models\SalesImportItem::where('transaction_at', '>=', $startDate)
            ->selectRaw('DATE(transaction_at) as date, SUM(amount) as total')
            ->groupBy('date')
            ->orderBy('date')
            ->get()
            ->mapWithKeys(function ($item) {
                return [$item->date => (int)$item->total];
            });

        $salesTrend = [];
        for ($i = 0; $i < 30; $i++) {
            $date = $startDate->copy()->addDays($i)->format('Y-m-d');
            $salesTrend[] = [
                'date' => $startDate->copy()->addDays($i)->format('m/d'),
                'amount' => $salesData[$date] ?? 0,
            ];
        }

        // 本月熱銷商品 Top 5 (Bar Chart)
        $topSellingProducts = \App\Modules\Sales\Models\SalesImportItem::with('product')
            ->whereMonth('transaction_at', now()->month)
            ->whereYear('transaction_at', now()->year)
            ->select('product_code', 'product_id', \Illuminate\Support\Facades\DB::raw('SUM(amount) as total_amount'))
            ->groupBy('product_code', 'product_id')
            ->orderByDesc('total_amount')
            ->limit(5)
            ->get()
            ->map(function ($item) {
                return [
                    'name' => $item->product ? $item->product->name : $item->product_code,
                    'amount' => (int)$item->total_amount,
                ];
            });

        // 庫存積壓排行 (Top Inventory Value)
        $topInventoryValue = \App\Modules\Inventory\Models\Inventory::with('product')
            ->select('product_id', \Illuminate\Support\Facades\DB::raw('SUM(quantity * unit_cost) as total_value'))
            ->where('quantity', '>', 0)
            ->groupBy('product_id')
            ->orderByDesc('total_value')
            ->limit(5)
            ->get()
            ->map(function ($item) {
                return [
                    'name' => $item->product ? $item->product->name : 'Unknown Product',
                    'code' => $item->product ? $item->product->code : '',
                    'value' => (int)$item->total_value,
                ];
            });

        // 熱銷數量排行 (Top Selling by Quantity)
        $topSellingByQuantity = \App\Modules\Sales\Models\SalesImportItem::with('product')
            ->whereMonth('transaction_at', now()->month)
            ->whereYear('transaction_at', now()->year)
            ->select('product_code', 'product_id', \Illuminate\Support\Facades\DB::raw('SUM(quantity) as total_quantity'))
            ->groupBy('product_code', 'product_id')
            ->orderByDesc('total_quantity')
            ->limit(5)
            ->get()
            ->map(function ($item) {
                return [
                    'name' => $item->product ? $item->product->name : $item->product_code,
                    'code' => $item->product_code,
                    'value' => (int)$item->total_quantity,
                ];
            });

        // 即將過期商品 (Expiring Soon)
        $expiringSoon = \App\Modules\Inventory\Models\Inventory::with('product')
            ->where('quantity', '>', 0)
            ->whereNotNull('expiry_date')
            ->where('expiry_date', '>=', now()) // 只顯示未過期但即將過期的
            ->orderBy('expiry_date', 'asc')
            ->limit(5)
            ->get()
            ->map(function ($item) {
                return [
                    'name' => $item->product ? $item->product->name : 'Unknown Product',
                    'batch_number' => $item->batch_number,
                    'expiry_date' => $item->expiry_date->format('Y-m-d'),
                    'quantity' => (int)$item->quantity,
                ];
            });

        return Inertia::render('Dashboard', [
            'stats' => [
                'totalItems' => $invStats['productsCount'],
                'lowStockCount' => $invStats['lowStockCount'],
                'negativeCount' => $invStats['negativeCount'] ?? 0,
                'expiringCount' => $invStats['expiringCount'] ?? 0,
                'totalInventoryValue' => $invStats['totalInventoryValue'] ?? 0,
                'thisMonthRevenue' => $thisMonthRevenue,
                'pendingOrdersCount' => $procStats['pendingOrdersCount'] ?? 0,
                'pendingTransferCount' => $invStats['pendingTransferCount'] ?? 0,
                'pendingProductionCount' => $pendingProductionCount,
                'todoCount' => ($procStats['pendingOrdersCount'] ?? 0) + ($invStats['pendingTransferCount'] ?? 0) + $pendingProductionCount,
                'salesTrend' => $salesTrend,
                'topSellingProducts' => $topSellingProducts,
                'topInventoryValue' => $topInventoryValue,
                'topSellingByQuantity' => $topSellingByQuantity,
                'expiringSoon' => $expiringSoon,
            ],
        ]);
    }
}