from celery import shared_task
from django.utils import timezone
from datetime import timedelta
from django.core.mail import EmailMessage
from django.conf import settings
from django.shortcuts import render
import os
from loguru import logger

# WeasyPrint可用性标记，初始为None
WEASYPRINT_AVAILABLE = None

# 获取WeasyPrint可用性
def is_weasyprint_available():
    """检查WeasyPrint是否可用"""
    global WEASYPRINT_AVAILABLE
    if WEASYPRINT_AVAILABLE is None:
        try:
            from weasyprint import HTML
            WEASYPRINT_AVAILABLE = True
        except ImportError:
            logger.warning("WeasyPrint库无法导入，PDF功能将不可用")
            WEASYPRINT_AVAILABLE = False
    return WEASYPRINT_AVAILABLE

from .models import (
    ReadingRecord,
    InsightRecord,
    FamilyTask,
    TodayPlan,
    SystemConfig
)

@shared_task
def send_daily_report():
    """发送每日报告"""
    logger.info("开始执行每日报告发送任务")
    
    # 检查WeasyPrint是否可用
    if not is_weasyprint_available():
        logger.error("WeasyPrint库不可用，无法生成PDF报告")
        return False
    
    today = timezone.now().date()
    today_str = today.strftime('%Y-%m-%d')
    
    # 获取系统配置
    config = SystemConfig.get_config()
    
    # 检查邮件配置是否完整
    if not all([config.smtp_server, config.smtp_username, config.smtp_password, config.recipient_email]):
        logger.error("邮件配置不完整，无法发送邮件")
        return False
    
    # 生成报告数据
    report_date = today
    yesterday = report_date - timedelta(days=1)
    
    # 获取昨日记录
    yesterday_reading = ReadingRecord.objects.filter(date=yesterday)
    yesterday_insight = InsightRecord.objects.filter(date=yesterday)
    
    # 获取今日计划
    today_plan = TodayPlan.objects.filter(date=report_date)
    
    # 获取家庭事项统计
    from django.db.models import Count
    family_task_stats = FamilyTask.objects.values('type').annotate(count=Count('id'))
    
    # 准备上下文
    context = {
        'today': report_date,
        'yesterday': yesterday,
        'yesterday_reading': yesterday_reading,
        'yesterday_insight': yesterday_insight,
        'today_plan': today_plan,
        'family_task_stats': family_task_stats,
    }
    
    # 渲染HTML模板
    html_string = render(None, 'core/report_pdf.html', context).content.decode('utf-8')
    
    # 生成PDF报告
    pdf_file = f"report_{today_str}.pdf"
    pdf_path = os.path.join(settings.REPORTS_ROOT, pdf_file)
    
    # 确保报告目录存在
    os.makedirs(settings.REPORTS_ROOT, exist_ok=True)
    
    # 生成PDF - 动态导入WeasyPrint
    try:
        from weasyprint import HTML
        HTML(string=html_string).write_pdf(pdf_path)
        logger.info(f"PDF报告生成成功: {pdf_path}")
    except Exception as e:
        logger.error(f"PDF报告生成失败: {str(e)}")
        return False
    
    # 发送邮件
    subject = f"家庭日报 - {today_str}"
    message = f"这是您的家庭日报，日期：{today_str}"
    from_email = config.smtp_username
    recipient_list = [config.recipient_email]
    
    try:
        email = EmailMessage(
            subject=subject,
            body=message,
            from_email=from_email,
            to=recipient_list,
        )
        
        # 添加附件
        with open(pdf_path, 'rb') as f:
            email.attach(pdf_file, f.read(), 'application/pdf')
        
        # 发送邮件
        email.send()
        logger.info(f"邮件发送成功，收件人：{config.recipient_email}")
        return True
    except Exception as e:
        logger.error(f"邮件发送失败：{str(e)}")
        return False