from django.shortcuts import render
from django.http import HttpResponse
from django.utils import timezone
from django.contrib.auth.decorators import login_required
from django.conf import settings
from datetime import datetime, timedelta
from loguru import logger
import os

from .models import (
    ReadingRecord,
    InsightRecord,
    Summary,
    FamilyTask,
    TodayPlan,
)
from .views import is_weasyprint_available


@login_required
def history_records(request):
    """历史记录查询页面"""
    logger.info("用户访问历史记录查询页面")
    
    start_date_str = request.GET.get('start_date')
    end_date_str = request.GET.get('end_date')
    
    if not start_date_str or not end_date_str:
        today = timezone.now().date()
        start_date = datetime(today.year, 1, 1).date()
        end_date = today
    else:
        start_date = datetime.strptime(start_date_str, '%Y-%m-%d').date()
        end_date = datetime.strptime(end_date_str, '%Y-%m-%d').date()
    
    # 查询各个类型的记录
    reading_records = ReadingRecord.objects.filter(
        date__range=[start_date, end_date]
    ).order_by('-date')
    
    insight_records = InsightRecord.objects.filter(
        date__range=[start_date, end_date]
    ).order_by('-date')
    
    summary_records = Summary.objects.filter(
        date__range=[start_date, end_date]
    ).order_by('-date')
    
    family_tasks = FamilyTask.objects.filter(
        created_at__date__range=[start_date, end_date]
    ).order_by('-created_at')
    
    today_plans = TodayPlan.objects.filter(
        date__range=[start_date, end_date]
    ).order_by('-date')
    
    context = {
        'start_date': start_date,
        'end_date': end_date,
        'reading_records': reading_records,
        'insight_records': insight_records,
        'summary_records': summary_records,
        'family_tasks': family_tasks,
        'today_plans': today_plans,
    }
    
    return render(request, 'core/history_records.html', context)


@login_required
def history_pdf(request):
    """导出历史记录PDF"""
    if not is_weasyprint_available():
        logger.error("WeasyPrint库不可用，无法生成PDF报告")
        return HttpResponse("PDF功能不可用，请检查WeasyPrint库是否正确安装", status=500)
    
    start_date_str = request.GET.get('start_date')
    end_date_str = request.GET.get('end_date')
    
    if not start_date_str or not end_date_str:
        return HttpResponse("请提供开始时间和结束时间", status=400)
    
    try:
        start_date = datetime.strptime(start_date_str, '%Y-%m-%d').date()
        end_date = datetime.strptime(end_date_str, '%Y-%m-%d').date()
    except ValueError:
        return HttpResponse("日期格式错误", status=400)
    
    if start_date > end_date:
        return HttpResponse("开始时间不能晚于结束时间", status=400)
    
    logger.info(f"用户导出历史记录PDF: {start_date} 至 {end_date}")
    
    try:
        # 查询各个类型的记录
        reading_records = ReadingRecord.objects.filter(
            date__range=[start_date, end_date]
        ).order_by('-date')
        
        insight_records = InsightRecord.objects.filter(
            date__range=[start_date, end_date]
        ).order_by('-date')
        
        summary_records = Summary.objects.filter(
            date__range=[start_date, end_date]
        ).order_by('-date')
        
        family_tasks = FamilyTask.objects.filter(
            created_at__date__range=[start_date, end_date]
        ).order_by('-created_at')
        
        today_plans = TodayPlan.objects.filter(
            date__range=[start_date, end_date]
        ).order_by('-date')
        
        context = {
            'start_date': start_date,
            'end_date': end_date,
            'reading_records': reading_records,
            'insight_records': insight_records,
            'summary_records': summary_records,
            'family_tasks': family_tasks,
            'today_plans': today_plans,
        }
        
        # 渲染HTML模板
        html_string = render(request, 'core/history_pdf.html', context).content.decode('utf-8')
        
        # 生成PDF
        pdf_file = f"history_{start_date_str}_to_{end_date_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)
        
        # 动态导入WeasyPrint
        from weasyprint import HTML
        HTML(string=html_string).write_pdf(pdf_path)
        
        logger.info(f"历史记录PDF生成成功: {pdf_path}")
        
        # 返回PDF文件
        with open(pdf_path, 'rb') as f:
            response = HttpResponse(f.read(), content_type='application/pdf')
            response['Content-Disposition'] = f'attachment; filename="{pdf_file}"'
            return response
            
    except Exception as e:
        logger.error(f"生成历史记录PDF失败: {str(e)}")
        return HttpResponse(f"生成PDF失败: {str(e)}", status=500)