"""
Celery Task Monitoring Admin - Unfold Style
"""
from django.contrib import admin
from django.utils.html import format_html
from django.contrib import messages
from django_celery_results.models import TaskResult
from unfold.admin import ModelAdmin
from unfold.contrib.filters.admin import RangeDateFilter


class CeleryTaskResultAdmin(ModelAdmin):
    """Admin interface for monitoring Celery tasks with Unfold styling"""
    
    list_display = [
        'task_id',
        'task_name',
        'colored_status',
        'date_created',
        'date_done',
        'execution_time',
    ]
    list_filter = [
        'status',
        'task_name',
        ('date_created', RangeDateFilter),
        ('date_done', RangeDateFilter),
    ]
    search_fields = ['task_id', 'task_name', 'task_args']
    readonly_fields = [
        'task_id', 'task_name', 'task_args', 'task_kwargs', 
        'result', 'traceback', 'date_created', 'date_done',
        'colored_status', 'execution_time'
    ]
    date_hierarchy = 'date_created'
    ordering = ['-date_created']
    
    actions = ['retry_failed_tasks', 'clear_old_tasks']
    
    fieldsets = (
        ('Task Information', {
            'fields': ('task_id', 'task_name', 'colored_status')
        }),
        ('Execution Details', {
            'fields': ('date_created', 'date_done', 'execution_time')
        }),
        ('Task Arguments', {
            'fields': ('task_args', 'task_kwargs'),
            'classes': ('collapse',)
        }),
        ('Result & Errors', {
            'fields': ('result', 'traceback'),
            'classes': ('collapse',)
        }),
    )
    
    def colored_status(self, obj):
        """Display status with color coding"""
        colors = {
            'SUCCESS': '#0bbf87',  # IGNY8 success green
            'FAILURE': '#ef4444',  # IGNY8 danger red
            'PENDING': '#ff7a00',  # IGNY8 warning orange
            'STARTED': '#0693e3',  # IGNY8 primary blue
            'RETRY': '#5d4ae3',    # IGNY8 purple
        }
        color = colors.get(obj.status, '#64748b')  # Default gray
        
        return format_html(
            '<span style="color: {}; font-weight: bold; font-size: 14px;">{}</span>',
            color,
            obj.status
        )
    colored_status.short_description = 'Status'
    
    def execution_time(self, obj):
        """Calculate and display execution time"""
        if obj.date_done and obj.date_created:
            duration = obj.date_done - obj.date_created
            seconds = duration.total_seconds()
            
            if seconds < 1:
                return format_html('<span style="color: #0bbf87;">{:.2f}ms</span>', seconds * 1000)
            elif seconds < 60:
                return format_html('<span style="color: #0693e3;">{:.2f}s</span>', seconds)
            else:
                minutes = seconds / 60
                return format_html('<span style="color: #ff7a00;">{:.1f}m</span>', minutes)
        return '-'
    execution_time.short_description = 'Duration'
    
    def retry_failed_tasks(self, request, queryset):
        """Retry failed celery tasks"""
        from celery import current_app
        
        failed_tasks = queryset.filter(status='FAILURE')
        count = 0
        errors = []
        
        for task in failed_tasks:
            try:
                # Get task function
                task_func = current_app.tasks.get(task.task_name)
                if task_func:
                    # Parse task args and kwargs
                    import ast
                    try:
                        args = ast.literal_eval(task.task_args) if task.task_args else []
                        kwargs = ast.literal_eval(task.task_kwargs) if task.task_kwargs else {}
                    except:
                        args = []
                        kwargs = {}
                    
                    # Retry the task
                    task_func.apply_async(args=args, kwargs=kwargs)
                    count += 1
                else:
                    errors.append(f'Task function not found: {task.task_name}')
            except Exception as e:
                errors.append(f'Error retrying {task.task_id}: {str(e)}')
        
        if count > 0:
            self.message_user(request, f'✅ Retried {count} failed task(s)', messages.SUCCESS)
        
        if errors:
            for error in errors[:5]:  # Show max 5 errors
                self.message_user(request, f'⚠️ {error}', messages.WARNING)
    
    retry_failed_tasks.short_description = '🔄 Retry Failed Tasks'
    
    def clear_old_tasks(self, request, queryset):
        """Clear old completed tasks"""
        from datetime import timedelta
        from django.utils import timezone
        
        # Delete tasks older than 30 days
        cutoff_date = timezone.now() - timedelta(days=30)
        old_tasks = queryset.filter(
            date_created__lt=cutoff_date,
            status__in=['SUCCESS', 'FAILURE']
        )
        
        count = old_tasks.count()
        old_tasks.delete()
        
        self.message_user(request, f'🗑️ Cleared {count} old task(s)', messages.SUCCESS)
    
    clear_old_tasks.short_description = '🗑️ Clear Old Tasks (30+ days)'
    
    def has_add_permission(self, request):
        """Disable manual task creation"""
        return False
    
    def has_change_permission(self, request, obj=None):
        """Make read-only"""
        return False