"""
System admin configuration
"""
from django.contrib import admin
from django.urls import reverse
from django.utils.html import format_html
from igny8_core.business.system.models import DebugConfiguration


@admin.register(DebugConfiguration)
class DebugConfigurationAdmin(admin.ModelAdmin):
    """Admin for debug configuration (singleton)"""
    
    def has_add_permission(self, request):
        # Only allow one instance
        return not DebugConfiguration.objects.exists()
    
    def has_delete_permission(self, request, obj=None):
        # Don't allow deletion
        return False
    
    def changelist_view(self, request, extra_context=None):
        # Redirect to edit view for singleton
        if DebugConfiguration.objects.exists():
            obj = DebugConfiguration.objects.first()
            return self.changeform_view(request, str(obj.pk), '', extra_context)
        return super().changelist_view(request, extra_context)
    
    fieldsets = (
        ('Debug Logging Control', {
            'fields': ('enable_debug_logging',),
            'description': '⚠️ <strong>Master Switch:</strong> When DISABLED, all logging below is completely skipped (zero overhead). When ENABLED, logs appear in console output.'
        }),
        ('Logging Categories', {
            'fields': (
                'log_ai_steps',
                'log_api_requests', 
                'log_database_queries',
                'log_celery_tasks',
            ),
            'description': 'Fine-tune what gets logged when debug logging is enabled'
        }),
        ('Audit', {
            'fields': ('updated_at', 'updated_by'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ('updated_at', 'updated_by')
    
    def save_model(self, request, obj, form, change):
        obj.updated_by = request.user
        super().save_model(request, obj, form, change)
        
        # Show message about cache clearing
        if change:
            self.message_user(request, 
                "Debug configuration updated. Cache cleared. Changes take effect immediately.",
                level='success'
            )
    
    class Media:
        css = {
            'all': ('admin/css/forms.css',)
        }