"""
Views for analytics app.
"""
from django.views.generic import TemplateView
from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.db.models import Count, Q, Avg, Max, Min
from django.utils import timezone
from django.utils.safestring import mark_safe
import json
from datetime import timedelta
from reports.models import ScamReport
from accounts.models import User, ActivityLog
from osint.models import OSINTTask
from moderation.models import ModerationAction


class AdminRequiredMixin(UserPassesTestMixin):
    """Mixin to require admin role."""
    def test_func(self):
        return self.request.user.is_authenticated and self.request.user.is_administrator()


class AnalyticsDashboardView(LoginRequiredMixin, AdminRequiredMixin, TemplateView):
    """Analytics dashboard."""
    template_name = 'analytics/dashboard.html'
    
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        
        # Report statistics
        context['total_reports'] = ScamReport.objects.count()
        context['pending_reports'] = ScamReport.objects.filter(status='pending').count()
        context['verified_reports'] = ScamReport.objects.filter(status='verified').count()
        context['rejected_reports'] = ScamReport.objects.filter(status='rejected').count()
        
        # Scam type breakdown with display names and percentages
        scam_types_data = ScamReport.objects.values('scam_type').annotate(
            count=Count('id')
        ).order_by('-count')
        
        scam_types_list = []
        total_reports = context.get('total_reports', 0)
        for item in scam_types_data:
            scam_type_key = item['scam_type']
            display_name = dict(ScamReport.SCAM_TYPE_CHOICES).get(scam_type_key, scam_type_key)
            percentage = (item['count'] / total_reports * 100) if total_reports > 0 else 0
            scam_types_list.append({
                'scam_type': scam_type_key,
                'display_name': display_name,
                'count': item['count'],
                'percentage': round(percentage, 1)
            })
        context['scam_types'] = scam_types_list
        
        # User statistics
        context['total_users'] = User.objects.count()
        context['moderators'] = User.objects.filter(role__in=['moderator', 'admin']).count()
        
        # OSINT statistics
        context['osint_tasks'] = OSINTTask.objects.count()
        context['completed_tasks'] = OSINTTask.objects.filter(status='completed').count()
        
        return context


class ReportAnalyticsView(LoginRequiredMixin, AdminRequiredMixin, TemplateView):
    """Report analytics."""
    template_name = 'analytics/reports.html'
    
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        
        # Overall statistics
        context['total_reports'] = ScamReport.objects.count()
        context['pending_reports'] = ScamReport.objects.filter(status='pending').count()
        context['verified_reports'] = ScamReport.objects.filter(status='verified').count()
        context['rejected_reports'] = ScamReport.objects.filter(status='rejected').count()
        context['under_review_reports'] = ScamReport.objects.filter(status='under_review').count()
        
        # Scam type distribution
        scam_types_data = ScamReport.objects.values('scam_type').annotate(
            count=Count('id')
        ).order_by('-count')
        
        scam_types_list = []
        for item in scam_types_data:
            scam_type_key = item['scam_type']
            display_name = dict(ScamReport.SCAM_TYPE_CHOICES).get(scam_type_key, scam_type_key)
            percentage = (item['count'] / context['total_reports'] * 100) if context['total_reports'] > 0 else 0
            scam_types_list.append({
                'scam_type': scam_type_key,
                'display_name': display_name,
                'count': item['count'],
                'percentage': round(percentage, 1)
            })
        context['scam_types'] = scam_types_list
        
        # Time-based statistics
        now = timezone.now()
        last_7_days = now - timedelta(days=7)
        last_30_days = now - timedelta(days=30)
        last_90_days = now - timedelta(days=90)
        
        context['reports_last_7_days'] = ScamReport.objects.filter(created_at__gte=last_7_days).count()
        context['reports_last_30_days'] = ScamReport.objects.filter(created_at__gte=last_30_days).count()
        context['reports_last_90_days'] = ScamReport.objects.filter(created_at__gte=last_90_days).count()
        
        # Daily reports for the last 30 days
        daily_reports = []
        for i in range(29, -1, -1):  # From 29 days ago to today
            date = now - timedelta(days=i)
            count = ScamReport.objects.filter(
                created_at__date=date.date()
            ).count()
            daily_reports.append({
                'date': date.date().isoformat(),
                'count': count
            })
        context['daily_reports'] = mark_safe(json.dumps(daily_reports))
        
        # Average moderation time
        verified_reports = ScamReport.objects.filter(
            status='verified',
            verified_at__isnull=False
        )
        if verified_reports.exists():
            moderation_times = []
            for report in verified_reports:
                if report.created_at and report.verified_at:
                    time_diff = report.verified_at - report.created_at
                    moderation_times.append(time_diff.total_seconds() / 3600)  # Convert to hours
            
            if moderation_times:
                context['avg_moderation_time_hours'] = round(sum(moderation_times) / len(moderation_times), 2)
                context['min_moderation_time_hours'] = round(min(moderation_times), 2)
                context['max_moderation_time_hours'] = round(max(moderation_times), 2)
        
        # Top reporters
        top_reporters = ScamReport.objects.values(
            'reporter__username',
            'reporter__email'
        ).annotate(
            report_count=Count('id')
        ).order_by('-report_count')[:10]
        context['top_reporters'] = top_reporters
        
        # Moderation statistics
        context['total_moderations'] = ModerationAction.objects.count()
        context['approvals'] = ModerationAction.objects.filter(action_type='approve').count()
        context['rejections'] = ModerationAction.objects.filter(action_type='reject').count()
        
        # Reports by status over time
        status_over_time = []
        for i in range(6, -1, -1):  # From 6 days ago to today
            date = now - timedelta(days=i)
            status_over_time.append({
                'date': date.date().isoformat(),
                'pending': ScamReport.objects.filter(status='pending', created_at__date=date.date()).count(),
                'verified': ScamReport.objects.filter(status='verified', created_at__date=date.date()).count(),
                'rejected': ScamReport.objects.filter(status='rejected', created_at__date=date.date()).count(),
            })
        context['status_over_time'] = mark_safe(json.dumps(status_over_time))
        
        return context


class UserAnalyticsView(LoginRequiredMixin, AdminRequiredMixin, TemplateView):
    """User analytics."""
    template_name = 'analytics/users.html'
    
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        # Add detailed user analytics
        return context