<?php

namespace App\Console\Commands;

use App\Services\DeepSeek\DeepSeekService;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;

/**
 * 剧本资产生成异步任务 worker
 *
 * 由 text:generate:dispatch 拉起；通过 MySQL 命名锁防止同一任务被重复执行。
 */
class TextScriptGenerateRunCommand extends Command
{
    /**
     * 任务处理锁前缀（配合 MySQL GET_LOCK 使用）
     */
    public const LOCK_PREFIX = 'script_text_generate_';

    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'text:generate:run {task_id : 剧本资产生成任务ID}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = '剧本资产生成worker：执行指定任务的流式模型生成并落库';

    /**
     * @var DeepSeekService
     */
    protected $deepSeekService;

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct(DeepSeekService $deepSeekService)
    {
        parent::__construct();
        $this->deepSeekService = $deepSeekService;
    }

    /**
     * Execute the console command.
     *
     * @return int
     */
    public function handle()
    {
        set_time_limit(0);

        $taskId = (int)$this->argument('task_id');
        $lockName = self::LOCK_PREFIX . $taskId;

        // 非阻塞抢占该任务的处理锁；抢不到说明已有其他进程正在处理
        $acquired = DB::selectOne('SELECT GET_LOCK(?, 0) AS acquired', [$lockName]);
        if (!$acquired || (int)$acquired->acquired !== 1) {
            dLog('command')->info("task_id: {$taskId} 正在被其他进程处理，本次直接退出");
            return 0;
        }

        dLog('command')->info("task_id: {$taskId} 抢占处理锁成功，开始处理...");

        try {
            $result = $this->deepSeekService->runScriptGenerateTaskAsync($taskId);
            dLog('command')->info('task_id: ' . $taskId . ' 处理结果: ' . json_encode($result, JSON_UNESCAPED_UNICODE));
            if (empty($result['ok'])) {
                logDB('command', 'error', '剧本资产生成worker异常', [
                    'task_id' => $taskId,
                    'status'  => $result['status'] ?? null,
                    'error'   => $result['error'] ?? '未知错误',
                ]);
            }
        } catch (\Throwable $e) {
            dLog('command')->error("task_id: {$taskId} 处理异常: " . $e->getMessage());
            logDB('command', 'error', '剧本资产生成worker异常', [
                'task_id' => $taskId,
                'error'   => $e->getMessage(),
            ]);
        } finally {
            // 显式释放处理锁；即使进程异常退出，连接断开后 MySQL 也会自动释放
            DB::statement('SELECT RELEASE_LOCK(?)', [$lockName]);
            dLog('command')->info("task_id: {$taskId} 处理结束，已释放处理锁");
        }

        return 0;
    }
}