<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Account;
use Illuminate\Http\Request;

class AccountController extends Controller
{
    public function index(Request $request)
    {
        // 🟢 1. 預先載入 holdings、transactions 還有全新開荒好的 security 字典表！
        $accounts = $request->user()->accounts()
            ->with(['holdings.transactions', 'holdings.security']) // 👈 確保能直接拿到最新價格
            ->get()
            ->map(function ($account) {

                $data = $account->toArray();

                // 🟢 2. 處理股票與基金的成本與估計現值計算
                if (in_array($account->type, ['stock', 'fund'])) {

                    $totalCost = 0;
                    $totalValue = 0;

                    foreach ($account->holdings as $holding) {

                        // 🟢 修正 1：直接拿資料庫存好的庫存股數，不用再去 transactions 加減計算
                        $remainingShares = floatval($holding->shares);

                        if ($remainingShares > 0) {

                            // 🟢 修正 2：拿到最新價格 (如果沒抓到就先給一個暫時的預設值，例如 10，方便你 debug 畫面)
                            $currentPrice = floatval($holding->security?->latest_price ?? 0);

                            if ($currentPrice == 0) {
                                // 💡 Debug 觀測：如果還是 0，我們先用 avg_cost 頂替，或者去手動確認 securities 表有沒有真的更新到價格
                                $currentPrice = floatval($holding->avg_cost ?? 0);
                            }

                            // 總現值 = 剩餘單位 * 最新價格
                            $totalValue += ($remainingShares * $currentPrice);

                            // 總成本：直接拿你畫面上已經有的 avg_cost * shares 算最快最準！
                            $avgCost = floatval($holding->avg_cost ?? 0);
                            $totalCost += ($remainingShares * $avgCost);
                        }
                    }

                    // 🟢 捨入並塞入回傳陣列
                    $data['total_cost']  = round($totalCost);  // 持倉成本
                    $data['total_value'] = round($totalValue); // 目前市值

                    // 💡 關鍵補強：計算總損益與總報酬率並塞回陣列，消滅前端的 NaN%！
                    $totalProfit = $totalValue - $totalCost;
                    $totalRate   = $totalCost > 0 ? ($totalProfit / $totalCost) * 100 : 0;

                    // 🚨 請確認這裡的 Key 名稱（例如 total_profit 或是 unrealized_profit），
                    // 要跟你在 Vue 前端 account.xxx 綁定的欄位名稱一模一樣喔！
                    $data['total_profit'] = round($totalProfit); 
                    $data['total_rate']   = round($totalRate, 2);
                }

                // 處理信用卡
                if ($account->type === 'credit_card') {
                    $data['unpaid_amount'] = $account->unpaidAmount();
                }

                return $data;
            });

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

    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'type' => 'required|in:cash,bank,stock,fund,wallet,credit_card',
            'currency' => 'nullable|string|max:10',
            'balance' => 'nullable|numeric',
            'note' => 'nullable|string',
            'billing_day' => 'nullable|integer|min:1|max:31',
            'payment_day' => 'nullable|integer|min:1|max:31',
        ]);

        $account = $request->user()->accounts()->create($validated);
        return response()->json($account, 201);
    }

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

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

        $validated = $request->validate([
            'name' => 'sometimes|string|max:255',
            'type' => 'sometimes|in:cash,bank,stock,fund,wallet,credit_card',
            'currency' => 'nullable|string|max:10',
            'balance' => 'nullable|numeric',
            'note' => 'nullable|string',
            'billing_day' => 'nullable|integer|min:1|max:31',
            'payment_day' => 'nullable|integer|min:1|max:31',
        ]);

        $account->update($validated);
        return response()->json($account);
    }

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