finance_app/app/Http/Controllers/Api/ExpenseController.php

<?php

namespace App\Http\Controllers\Api; // 💡 建議放到 Api 命名空間下

use App\Http\Controllers\Controller;
use App\Models\Category;
use App\Models\CategoryRule;
use App\Models\Expense;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Http\Request;

class ExpenseController extends Controller
{
    use AuthorizesRequests;

    /**
     * 1. 取得使用者所有支出明細
     * GET /api/expenses
     */
    public function index()
    {
        $expenses = Expense::with('category')
            ->where('user_id', auth()->id())
            ->orderBy('date', 'desc')
            ->get();

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

    /**
     * 2. 取得使用者所有的消費分類
     * GET /api/categories
     */
    public function categories()
    {
        $categories = Category::where('user_id', auth()->id())->get();
        return response()->json($categories);
    }

    /**
     * 3. 取得使用者所有的自動分類規則
     * GET /api/category-rules
     */
    public function categoryRules()
    {
        $rules = CategoryRule::with('category')
            ->where('user_id', auth()->id())
            ->get();

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

    /**
     * 4. 手動新增支出明細
     * POST /api/expenses
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'amount' => 'required|numeric|min:0',
            'category_id' => 'nullable|exists:categories,id',
            'item_name' => 'nullable|string|max:255',
            'seller_name' => 'nullable|string|max:255',
            'is_amortized' => 'boolean',
            'period_start' => 'nullable|date',
            'period_end' => 'nullable|date|after_or_equal:period_start',
            'date' => 'required|date',
            'note' => 'nullable|string|max:255',
        ]);

        $expense = Expense::create([
            ...$validated,
            'user_id' => $request->user()->id,
        ]);

        // 🟢 核心優化：載入分類關聯，這樣前端拿到的 response.data 才能立刻顯示分類顏色
        $expense->load('category');

        return response()->json($expense, 201);
    }

    /**
     * 5. 修改單筆支出
     * PUT /api/expenses/{expense}
     */
    public function update(Request $request, Expense $expense)
    {
        $this->authorize('update', $expense);

        $validated = $request->validate([
            'amount' => 'required|numeric|min:0',
            'category_id' => 'nullable|exists:categories,id',
            'item_name' => 'nullable|string|max:255',
            'date' => 'required|date',
            'note' => 'nullable|string|max:255',
            'seller_name' => 'nullable|string|max:255',
            'is_amortized' => 'boolean',
            'period_start' => 'nullable|date',
            'period_end' => 'nullable|date|after_or_equal:period_start',
        ]);

        $expense->update($validated);

        // 🟢 核心優化：同樣載入分類關聯
        $expense->load('category');

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

    /**
     * 6. 刪除單筆支出
     * DELETE /api/expenses/{expense}
     */
    public function destroy(Expense $expense)
    {
        $this->authorize('delete', $expense);
        $expense->delete();

        return response()->json(['message' => '刪除成功']);
    }

    /**
     * 7. 批量刪除支出
     * POST /api/expenses/destroy-batch
     */
    public function destroyBatch(Request $request)
    {
        $request->validate(['ids' => 'required|array']);

        Expense::whereIn('id', $request->ids)
            ->where('user_id', $request->user()->id)
            ->delete();

        return response()->json(['message' => '批量刪除成功']);
    }
}