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

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Jobs\UpdateAssetPriceJob;
use App\Models\Account;
use App\Models\InvestmentHolding;
use App\Models\Security;
use Illuminate\Http\Request;

class InvestmentHoldingController extends Controller
{
    public function index(Request $request, string $accountId)
    {
        $account = $request->user()->accounts()->findOrFail($accountId);

        // 🟢 1. 預先載入最新價格字典表關聯，避免 N+1 問題
        $holdings = $account->holdings()->with('security')->get();

        // 🟢 2. 透過 map 幫每檔持倉加工算出市值與報酬率
        $processedHoldings = $holdings->map(function ($holding) {

            $data = $holding->toArray();

            $remainingShares = floatval($holding->shares);
            $avgCost = floatval($holding->avg_cost);

            // 預設給 0 或拿平均成本防呆
            $currentPrice = floatval($holding->security?->latest_price ?? 0);
            if ($currentPrice == 0) {
                $currentPrice = $avgCost;
            }

            if ($remainingShares > 0) {
                // 單一標的總成本
                $totalCost = $remainingShares * $avgCost;
                // 單一標目前市值
                $currentValue = $remainingShares * $currentPrice;
                // 單一標的未實現損益
                $profit = $currentValue - $totalCost;
                // 單一標的報酬率
                $profitRate = $totalCost > 0 ? ($profit / $totalCost) * 100 : 0;

                // 🟢 3. 塞入擴充數據欄位
                $data['latest_price'] = $currentPrice;
                $data['current_value'] = round($currentValue);
                $data['profit'] = round($profit);
                $data['profit_rate'] = round($profitRate, 2);
            } else {
                // 庫存為 0 的防呆
                $data['latest_price'] = $currentPrice;
                $data['current_value'] = 0;
                $data['profit'] = 0;
                $data['profit_rate'] = 0;
            }

            return $data;
        });

        // 傳回包含豐富績效數據的持倉清單
        return response()->json($processedHoldings);
    }

    public function store(Request $request, string $accountId)
    {
        $account = $request->user()->accounts()->findOrFail($accountId);

        $validated = $request->validate([
            'type' => 'required|in:stock,fund',
            'symbol' => 'required|string|max:20',
            'name' => 'required|string|max:255',
        ]);

        $holding = $account->holdings()->create($validated);

        // 檢查security: 如果之前有資料不create, 如果之前沒有資料create
        $security = Security::firstOrCreate(
            ['code' => $validated['symbol']], // 尋找條件
            [
                'type' => $validated['type'],
                'name' => $validated['name'],
                'source' => $request->input('source') ?? 'twse',
            ]
        );

        // 立即派發更新價格的任務
        UpdateAssetPriceJob::dispatch($security->code, $security->type, $security->name);

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

    public function show(Request $request, string $accountId, string $id)
    {
        $account = $request->user()->accounts()->findOrFail($accountId);
        $holding = $account->holdings()->findOrFail($id);
        return response()->json($holding);
    }

    public function update(Request $request, string $accountId, string $id)
    {
        $account = $request->user()->accounts()->findOrFail($accountId);
        $holding = $account->holdings()->findOrFail($id);

        $validated = $request->validate([
            'name' => 'sometimes|string|max:255',
        ]);

        $holding->update($validated);

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

    public function destroy(Request $request, string $accountId, string $id)
    {
        $account = $request->user()->accounts()->findOrFail($accountId);
        $holding = $account->holdings()->findOrFail($id);
        $holding->delete();
        return response()->json(null, 204);
    }

    
}