<?php

namespace App\Jobs;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Str;
use App\Models\User;
use App\Models\Expense;
use App\Services\GmailParserService;
use Google\Client as GoogleClient;
use Google\Service\Gmail;
use Illuminate\Support\Facades\Log;
use Carbon\Carbon;

class FetchAndParseGmailInvoices implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    protected $user;


    public function __construct(User $user)
    {
        $this->user = $user;
    }

    public function handle(GmailParserService $parserService)
    {
        Log::info("====== [DEBUG START] 開始執行 Gmail 抓信任務 ======");

        if (!$this->user->google_refresh_token) {
            Log::error("❌ 失敗：User ID {$this->user->id} 缺乏 google_refresh_token");
            return;
        }

        try {
            Log::info("🔄 正在初始化 Google Client & 刷新 Token...");
            $client = new GoogleClient();
            $client->setClientId(config('services.google.client_id'));
            $client->setClientSecret(config('services.google.client_secret'));
            $client->refreshToken($this->user->google_refresh_token);
            $gmailService = new Gmail($client);

            $afterDate = Carbon::now()->subDays(3)->format('Y/m/d');
            $searchQuery = "from:cathaybk.com.tw subject:消費彙整通知 after:{$afterDate}";
            Log::info("🔍 正在向 Google API 發送搜尋 Query: [{$searchQuery}]");

            $response = $gmailService->users_messages->listUsersMessages('me', [
                'q' => $searchQuery,
                'maxResults' => 10
            ]);

            $messages = $response->getMessages();

            if (empty($messages)) {
                Log::warning("⚠️ 警告：Google API 回傳空陣列！");
                return;
            }

            Log::info("🎯 成功拿到信件清單！總共發現 " . count($messages) . " 封潛在信件，開始逐封處理...");

            foreach ($messages as $index => $msgItem) {
                $msgId = $msgItem->getId();
                Log::info("--- [處理第 " . ($index + 1) . " 封信] ID: {$msgId} ---");

                $message = $gmailService->users_messages->get('me', $msgId, ['format' => 'full']);
                $payload = $message->getPayload();

                $subject = '';
                foreach ($payload->getHeaders() as $header) {
                    if ($header->getName() === 'Subject') {
                        $subject = $header->getValue();
                        break;
                    }
                }
                Log::info("📬 信件主旨: [{$subject}]");

                $body = $this->getDecodedBody($payload);
                Log::info("📄 內文解碼完成，準備丟入 Parser...");

                // 1. 執行解析（現在國泰會回報陣列，其餘單筆通知我們手動把它包成陣列）
                $parsedResult = $parserService->parse($subject, $body);

                if (!$parsedResult) {
                    Log::error("❌ 失敗：GmailParserService 無法解析此信件內容");
                    continue;
                }

                // 💡 智慧防呆：如果回傳的是單筆消費（一維陣列），我們把它包成二維陣列，這樣下面統一用 foreach 處理
                $expensesList = isset($parsedResult['amount']) ? [$parsedResult] : $parsedResult;

                Log::info("✨ Parser 解析成功！共發現 " . count($expensesList) . " 筆刷卡消費項目，開始遍歷寫入...");

                // 🔄 遍歷這封信裡面的每一筆刷卡紀錄
                foreach ($expensesList as $parsedData) {

                    // 🟢 2. 智慧資產帳戶對照
                    $matchedAccountRule = \App\Models\AccountRule::where('user_id', $this->user->id)
                        ->get()
                        ->first(function ($rule) use ($subject) {
                            return Str::contains($subject, $rule->keyword);
                        });
                    $accountId = $matchedAccountRule ? $matchedAccountRule->account_id : null;

                    // 🟢 3. 智慧消費分類對照
                    $matchedCategoryRule = \App\Models\CategoryRule::where('user_id', $this->user->id)
                        ->get()
                        ->first(function ($rule) use ($parsedData) {
                            return Str::contains(strtoupper($parsedData['seller_name']), strtoupper($rule->keyword));
                        });
                    $categoryId = $matchedCategoryRule ? $matchedCategoryRule->category_id : null;

                    // 4. 💾 嘗試寫入資料庫
                    $expense = Expense::firstOrCreate(
                        [
                            'user_id'     => $this->user->id,
                            'amount'      => $parsedData['amount'],
                            'seller_name' => $parsedData['seller_name'],
                            'date'        => $parsedData['date'],
                        ],
                        [
                            'item_name'   => $parsedData['item_name'],
                            'account_id'  => $accountId,
                            'category_id' => $categoryId,
                            'note'        => 'Gmail自動同步(多筆完全體)',
                        ]
                    );

                    if ($expense->wasRecentlyCreated) {
                        Log::info("✅ 成功！建立全新消費: [{$parsedData['seller_name']}] 額度: [{$parsedData['amount']}], ID: {$expense->id}");
                    } else {
                        Log::info("ℹ️ 提示：[{$parsedData['seller_name']}] 額度: [{$parsedData['amount']}] 已存在，跳過。");
                    }
                }
            }

            Log::info("====== [DEBUG END] Gmail 抓信任務順利結束 ======");
        } catch (\Exception $e) {
            Log::error("💥 崩潰！handle 內發生致命錯誤: " . $e->getMessage());
        }
    }

    private function getDecodedBody($part)
    {
        $body = $part->getBody();
        if ($body && $body->getData()) {
            return base64_decode(str_replace(['-', '_'], ['+', '/'], $body->getData()));
        }
        $parts = $part->getParts();
        if ($parts) {
            foreach ($parts as $subPart) {
                $result = $this->getDecodedBody($subPart);
                if ($result) return $result;
            }
        }
        return '';
    }
}