import os
import logging
import requests
from celery import shared_task
from django.utils import timezone
from django.conf import settings

logger = logging.getLogger(__name__)

@shared_task
def publish_scheduled_video(video_id):
    """定时发布视频的任务"""
    from .models import Video
    
    try:
        # 获取视频记录
        video = Video.objects.get(id=video_id)
        
        # 检查视频状态是否为已排期
        if video.status != 'scheduled':
            logger.warning(f"视频 {video_id} 状态不是'已排期'，当前状态: {video.status}，跳过发布")
            return
        
        # 检查视频文件是否存在
        if not video.local_path or not os.path.exists(video.local_path):
            logger.error(f"视频 {video_id} 的本地文件不存在: {video.local_path}")
            video.status = 'failed'
            video.save()
            return
            
        # 模拟上传到平台的过程
        # 在实际应用中，这里需要根据不同平台调用不同的API
        platform_account = video.platform_account
        platform_name = platform_account.platform_name
        
        # 模拟成功上传并获取视频URL
        video_url = f"https://example.com/{platform_name}/{video.id}"
        video_id = f"VID_{video.id}"
        
        # 在实际应用中，这里应该调用各平台的API
        logger.info(f"模拟上传视频 {video.id} 到 {platform_name} 平台")
        
        # 更新视频状态
        video.status = 'published'
        video.publish_time = timezone.now()
        video.video_url = video_url
        video.video_id = video_id
        video.save()
        
        logger.info(f"视频 {video.id} 已成功发布到 {platform_name} 平台")
        
        # 记录到知识库
        _update_knowledge_base(video)
        
        return {
            "success": True,
            "video_id": video.id,
            "platform": platform_name,
            "publish_time": video.publish_time.strftime("%Y-%m-%d %H:%M:%S"),
            "video_url": video_url
        }
        
    except Video.DoesNotExist:
        logger.error(f"未找到ID为 {video_id} 的视频记录")
        return {"success": False, "error": f"未找到ID为 {video_id} 的视频记录"}
    except Exception as e:
        logger.error(f"发布视频 {video_id} 失败: {str(e)}")
        
        # 尝试更新视频状态为失败
        try:
            video = Video.objects.get(id=video_id)
            video.status = 'failed'
            video.save()
        except:
            pass
            
        return {"success": False, "error": str(e)}

def _update_knowledge_base(video):
    """更新知识库中的视频信息"""
    from .models import KnowledgeBase, KnowledgeBaseDocument
    
    try:
        # 获取关联的平台账号和运营账号
        platform_account = video.platform_account
        operator = platform_account.operator
        
        # 查找对应的知识库
        knowledge_base = KnowledgeBase.objects.filter(
            name__contains=operator.real_name,
            type='private'
        ).first()
        
        if not knowledge_base:
            logger.warning(f"未找到与运营账号 {operator.real_name} 关联的知识库")
            return
            
        # 查找相关的文档
        document = KnowledgeBaseDocument.objects.filter(
            knowledge_base=knowledge_base,
            document_name__contains=video.title,
            status='active'
        ).first()
        
        if not document:
            logger.warning(f"未找到与视频 {video.title} 关联的知识库文档")
            return
            
        # 在实际应用中，这里应该调用外部API更新文档内容
        logger.info(f"更新知识库文档 {document.document_id} 的视频发布状态")
        
        # 模拟更新文档内容
        # 这里只记录日志，实际应用中需要调用外部API
        
    except Exception as e:
        logger.error(f"更新知识库失败: {str(e)}")

@shared_task
def check_scheduled_videos():
    """定期检查计划发布的视频，处理未被正确调度的视频"""
    from .models import Video
    from datetime import timedelta
    
    try:
        # 查找所有已经过了计划发布时间但仍处于scheduled状态的视频
        now = timezone.now()
        threshold = now - timedelta(minutes=30)  # 30分钟容差
        
        videos = Video.objects.filter(
            status='scheduled',
            scheduled_time__lt=threshold
        )
        
        for video in videos:
            logger.warning(f"发现未按计划发布的视频: {video.id}, 计划发布时间: {video.scheduled_time}")
            # 手动触发发布任务
            publish_scheduled_video.delay(video.id)
            
        return f"检查了 {videos.count()} 个未按计划发布的视频"
        
    except Exception as e:
        logger.error(f"检查未发布视频失败: {str(e)}")
        return f"检查未发布视频失败: {str(e)}"