"""
Custom Admin Dashboard with Key Metrics
"""
from django.contrib import admin
from django.shortcuts import render
from django.db.models import Count, Sum, Q
from django.utils import timezone
from datetime import timedelta


def admin_dashboard(request):
    """Custom admin dashboard with operational metrics"""
    
    # Date ranges
    today = timezone.now().date()
    week_ago = today - timedelta(days=7)
    month_ago = today - timedelta(days=30)
    
    # Account metrics
    from igny8_core.auth.models import Account, Site
    total_accounts = Account.objects.count()
    active_accounts = Account.objects.filter(status='active').count()
    low_credit_accounts = Account.objects.filter(
        status='active',
        credits__lt=100
    ).count()
    critical_credit_accounts = Account.objects.filter(
        status='active',
        credits__lt=10
    ).count()
    
    # Site metrics
    total_sites = Site.objects.count()
    active_sites = Site.objects.filter(is_active=True, status='active').count()
    
    # Content metrics
    from igny8_core.modules.writer.models import Content, Tasks
    content_this_week = Content.objects.filter(created_at__gte=week_ago).count()
    content_this_month = Content.objects.filter(created_at__gte=month_ago).count()
    tasks_pending = Tasks.objects.filter(status='pending').count()
    tasks_in_progress = Tasks.objects.filter(status='in_progress').count()
    
    # Billing metrics
    from igny8_core.business.billing.models import Payment, CreditTransaction
    pending_payments = Payment.objects.filter(status='pending_approval').count()
    payments_this_month = Payment.objects.filter(
        created_at__gte=month_ago,
        status='succeeded'
    ).aggregate(total=Sum('amount'))['total'] or 0
    
    credit_usage_this_month = CreditTransaction.objects.filter(
        created_at__gte=month_ago,
        transaction_type='deduction'
    ).aggregate(total=Sum('amount'))['total'] or 0
    
    # Automation metrics
    from igny8_core.business.automation.models import AutomationRun
    automation_running = AutomationRun.objects.filter(status='running').count()
    automation_failed = AutomationRun.objects.filter(
        status='failed',
        started_at__gte=week_ago
    ).count()
    
    # Calculate success rate
    total_runs = AutomationRun.objects.filter(started_at__gte=week_ago).count()
    if total_runs > 0:
        success_runs = AutomationRun.objects.filter(
            started_at__gte=week_ago,
            status='completed'
        ).count()
        automation_success_rate = round((success_runs / total_runs) * 100, 1)
    else:
        automation_success_rate = 0
    
    # WordPress sync metrics
    from igny8_core.business.integration.models import SyncEvent
    sync_failed_today = SyncEvent.objects.filter(
        success=False,
        created_at__date=today
    ).count()
    sync_success_today = SyncEvent.objects.filter(
        success=True,
        created_at__date=today
    ).count()
    
    # Celery task metrics
    try:
        from django_celery_results.models import TaskResult
        celery_failed = TaskResult.objects.filter(
            status='FAILURE',
            date_created__gte=week_ago
        ).count()
        celery_pending = TaskResult.objects.filter(status='PENDING').count()
    except:
        celery_failed = 0
        celery_pending = 0
    
    # Generate alerts
    alerts = []
    
    if critical_credit_accounts > 0:
        alerts.append({
            'level': 'error',
            'message': f'{critical_credit_accounts} account(s) have CRITICAL low credits (< 10)',
            'action': 'Review Accounts',
            'url': '/admin/igny8_core_auth/account/?credits__lt=10'
        })
    
    if low_credit_accounts > 0:
        alerts.append({
            'level': 'warning',
            'message': f'{low_credit_accounts} account(s) have low credits (< 100)',
            'action': 'Review Accounts',
            'url': '/admin/igny8_core_auth/account/?credits__lt=100'
        })
    
    if pending_payments > 0:
        alerts.append({
            'level': 'warning',
            'message': f'{pending_payments} payment(s) awaiting approval',
            'action': 'Approve Payments',
            'url': '/admin/billing/payment/?status__exact=pending_approval'
        })
    
    if automation_failed > 5:
        alerts.append({
            'level': 'error',
            'message': f'{automation_failed} automation runs failed this week',
            'action': 'View Failed Runs',
            'url': '/admin/automation/automationrun/?status__exact=failed'
        })
    
    if sync_failed_today > 0:
        alerts.append({
            'level': 'warning',
            'message': f'{sync_failed_today} WordPress sync failure(s) today',
            'action': 'View Sync Events',
            'url': '/admin/integration/syncevent/?success__exact=0'
        })
    
    if celery_failed > 10:
        alerts.append({
            'level': 'error',
            'message': f'{celery_failed} Celery tasks failed this week',
            'action': 'View Failed Tasks',
            'url': '/admin/django_celery_results/taskresult/?status__exact=FAILURE'
        })
    
    context = {
        'title': 'IGNY8 Dashboard',
        'site_title': 'IGNY8 Admin',
        'site_header': 'IGNY8 Administration',
        # Account metrics
        'total_accounts': total_accounts,
        'active_accounts': active_accounts,
        'low_credit_accounts': low_credit_accounts,
        'critical_credit_accounts': critical_credit_accounts,
        # Site metrics
        'total_sites': total_sites,
        'active_sites': active_sites,
        # Content metrics
        'content_this_week': content_this_week,
        'content_this_month': content_this_month,
        'tasks_pending': tasks_pending,
        'tasks_in_progress': tasks_in_progress,
        # Billing metrics
        'pending_payments': pending_payments,
        'payments_this_month': float(payments_this_month),
        'credit_usage_this_month': abs(float(credit_usage_this_month)),
        # Automation metrics
        'automation_running': automation_running,
        'automation_failed': automation_failed,
        'automation_success_rate': automation_success_rate,
        # Integration metrics
        'sync_failed_today': sync_failed_today,
        'sync_success_today': sync_success_today,
        # Celery metrics
        'celery_failed': celery_failed,
        'celery_pending': celery_pending,
        # Alerts
        'alerts': alerts,
    }
    
    # Merge with admin context to get sidebar and header
    from igny8_core.admin.site import admin_site
    admin_context = admin_site.each_context(request)
    context.update(admin_context)
    
    return render(request, 'admin/dashboard.html', context)