import logging
from celery import shared_task
from django.core.management import call_command
# from django.conf import settings
from .models import Website, Article
from .utils import full_site_crawler

logger = logging.getLogger(__name__)


@shared_task(bind=True, max_retries=3)
def crawl_website(self, website_id, node_id=None, batch_id=None):
    """
    爬取单个网站的任务
    """
    try:
        website = Website.objects.get(id=website_id)
        logger.info(f"开始爬取网站: {website.name} (节点: {node_id}, 批次: {batch_id})")

        # 记录任务开始
        if node_id and batch_id:
            from .distributed_crawler import distributed_crawler
            distributed_crawler.heartbeat(node_id, 1)

        # 调用爬虫函数
        full_site_crawler(website.base_url, website, max_pages=100)

        # 统计结果
        article_count = website.article_set.count()
        logger.info(f"网站 {website.name} 爬取完成，共 {article_count} 篇文章")

        # 记录任务完成
        if node_id and batch_id:
            distributed_crawler.heartbeat(node_id, 0)

        return {
            'website_id': website_id,
            'website_name': website.name,
            'article_count': article_count,
            'status': 'success',
            'node_id': node_id,
            'batch_id': batch_id
        }

    except Website.DoesNotExist:
        logger.error(f"网站不存在: {website_id}")
        raise
    except Exception as exc:
        logger.error(f"爬取网站 {website_id} 失败: {exc}")
        # 重试任务
        raise self.retry(exc=exc, countdown=60 * 5)  # 5分钟后重试


@shared_task(bind=True, max_retries=3)
def crawl_all_websites(self):
    """
    爬取所有网站的任务
    """
    try:
        logger.info("开始批量爬取所有网站")

        # 获取所有启用的网站
        websites = Website.objects.filter(enabled=True)
        total_websites = websites.count()

        results = []
        for website in websites:
            try:
                # 调用单个网站爬取任务
                result = crawl_website.delay(website.id)
                results.append({
                    'website_id': website.id,
                    'website_name': website.name,
                    'task_id': result.id
                })
            except Exception as e:
                logger.error(f"启动网站 {website.name} 爬取任务失败: {e}")
                results.append({
                    'website_id': website.id,
                    'website_name': website.name,
                    'error': str(e)
                })

        logger.info(f"批量爬取任务启动完成，共 {total_websites} 个网站")

        return {
            'total_websites': total_websites,
            'results': results,
            'status': 'started'
        }

    except Exception as exc:
        logger.error(f"批量爬取任务失败: {exc}")
        raise self.retry(exc=exc, countdown=60 * 10)  # 10分钟后重试


@shared_task
def crawl_specific_media(media_list):
    """
    爬取指定媒体的任务
    """
    try:
        logger.info(f"开始爬取指定媒体: {media_list}")

        # 调用管理命令
        call_command('crawl_all_media', media=','.join(media_list))

        return {
            'media_list': media_list,
            'status': 'success'
        }

    except Exception as e:
        logger.error(f"爬取指定媒体失败: {e}")
        raise


@shared_task
def cleanup_old_articles(days=30):
    """
    清理旧文章的任务
    """
    try:
        from django.utils import timezone
        from datetime import timedelta

        cutoff_date = timezone.now() - timedelta(days=days)
        old_articles = Article.objects.filter(created_at__lt=cutoff_date)
        count = old_articles.count()

        old_articles.delete()

        logger.info(f"清理了 {count} 篇旧文章（{days}天前）")

        return {
            'deleted_count': count,
            'cutoff_date': cutoff_date.isoformat(),
            'status': 'success'
        }

    except Exception as e:
        logger.error(f"清理旧文章失败: {e}")
        raise


@shared_task
def export_articles():
    """
    导出文章的任务
    """
    try:
        logger.info("开始导出文章")

        # 调用导出命令
        call_command('export_articles')

        return {
            'status': 'success',
            'message': '文章导出完成'
        }

    except Exception as e:
        logger.error(f"导出文章失败: {e}")
        raise


@shared_task
def health_check():
    """
    健康检查任务
    """
    try:
        # 检查数据库连接
        website_count = Website.objects.count()
        article_count = Article.objects.count()

        # 检查Redis连接
        from django.core.cache import cache
        cache.set('health_check', 'ok', 60)
        cache_result = cache.get('health_check')

        return {
            'database': 'ok',
            'redis': 'ok' if cache_result == 'ok' else 'error',
            'website_count': website_count,
            'article_count': article_count,
            'status': 'healthy'
        }

    except Exception as e:
        logger.error(f"健康检查失败: {e}")
        return {
            'status': 'unhealthy',
            'error': str(e)
        }