buid new app

app/Http/Controllers/DashboardController.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Expense;
+use Illuminate\Support\Facades\Auth;
+use Inertia\Inertia;
+use Carbon\Carbon;
+
+class DashboardController extends Controller
+{
+    public function index()
+    {
+        $userId = Auth::id();
+        $now    = Carbon::now();
+
+        // 本月花費
+        $monthlyTotal = Expense::where('user_id', $userId)
+            ->whereYear('date',  $now->year)
+            ->whereMonth('date', $now->month)
+            ->sum('amount');
+
+        // 本月分類統計（圓餅圖）
+        $categoryStats = Expense::with('category')
+            ->where('user_id', $userId)
+            ->whereYear('date',  $now->year)
+            ->whereMonth('date', $now->month)
+            ->get()
+            ->groupBy(fn($e) => $e->category?->name ?? '未分類')
+            ->map(fn($group, $name) => [
+                'name'   => $name,
+                'total'  => $group->sum('amount'),
+                'color'  => $group->first()->category?->color ?? '#6B7280',
+            ])
+            ->values();
+
+        // 近6個月趨勢
+        $monthlyTrend = collect(range(5, 0))->map(function ($i) use ($userId, $now) {
+            $month = $now->copy()->subMonths($i);
+            $total = Expense::where('user_id', $userId)
+                ->whereYear('date',  $month->year)
+                ->whereMonth('date', $month->month)
+                ->sum('amount');
+
+            return [
+                'month' => $month->format('Y/m'),
+                'total' => (float) $total,
+            ];
+        });
+
+        return Inertia::render('Dashboard', [
+            'monthlyTotal'  => (float) $monthlyTotal,
+            'categoryStats' => $categoryStats,
+            'monthlyTrend'  => $monthlyTrend,
+        ]);
+    }
+}