from django.db.models.signals import post_save, pre_save
from django.dispatch import receiver
from django.contrib.auth.models import Group
from django.db import transaction
from django.core.files import File
from django.core.files.temp import NamedTemporaryFile
from .models import User, UserProfile, EmailVerification
from security import safe_requests

@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    """Create UserProfile for new users"""
    try:
        if created:
            # Create profile
            profile = UserProfile.objects.create(user=instance)
            
            # If user has a social account with avatar, download it
            social_account = instance.socialaccount_set.first()
            if social_account:
                extra_data = social_account.extra_data
                avatar_url = None
                
                if social_account.provider == 'google':
                    avatar_url = extra_data.get('picture')
                elif social_account.provider == 'discord':
                    avatar = extra_data.get('avatar')
                    discord_id = extra_data.get('id')
                    if avatar:
                        avatar_url = f'https://cdn.discordapp.com/avatars/{discord_id}/{avatar}.png'
                
                if avatar_url:
                    try:
                        response = safe_requests.get(avatar_url, timeout=60)
                        if response.status_code == 200:
                            img_temp = NamedTemporaryFile(delete=True)
                            img_temp.write(response.content)
                            img_temp.flush()
                            
                            file_name = f"avatar_{instance.username}.png"
                            profile.avatar.save(
                                file_name,
                                File(img_temp),
                                save=True
                            )
                    except Exception as e:
                        print(f"Error downloading avatar for user {instance.username}: {str(e)}")
    except Exception as e:
        print(f"Error creating profile for user {instance.username}: {str(e)}")

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    """Ensure UserProfile exists and is saved"""
    try:
        if not hasattr(instance, 'profile'):
            UserProfile.objects.create(user=instance)
        instance.profile.save()
    except Exception as e:
        print(f"Error saving profile for user {instance.username}: {str(e)}")

@receiver(pre_save, sender=User)
def sync_user_role_with_groups(sender, instance, **kwargs):
    """Sync user role with Django groups"""
    if instance.pk:  # Only for existing users
        try:
            old_instance = User.objects.get(pk=instance.pk)
            if old_instance.role != instance.role:
                # Role has changed, update groups
                with transaction.atomic():
                    # Remove from old role group if exists
                    if old_instance.role != User.Roles.USER:
                        old_group = Group.objects.filter(name=old_instance.role).first()
                        if old_group:
                            instance.groups.remove(old_group)
                    
                    # Add to new role group
                    if instance.role != User.Roles.USER:
                        new_group, _ = Group.objects.get_or_create(name=instance.role)
                        instance.groups.add(new_group)
                        
                        # Special handling for superuser role
                        if instance.role == User.Roles.SUPERUSER:
                            instance.is_superuser = True
                            instance.is_staff = True
                        elif old_instance.role == User.Roles.SUPERUSER:
                            # If removing superuser role, remove superuser status
                            instance.is_superuser = False
                            if instance.role not in [User.Roles.ADMIN, User.Roles.MODERATOR]:
                                instance.is_staff = False
                        
                        # Handle staff status for admin and moderator roles
                        if instance.role in [User.Roles.ADMIN, User.Roles.MODERATOR]:
                            instance.is_staff = True
                        elif old_instance.role in [User.Roles.ADMIN, User.Roles.MODERATOR]:
                            # If removing admin/moderator role, remove staff status
                            if instance.role not in [User.Roles.SUPERUSER]:
                                instance.is_staff = False
        except User.DoesNotExist:
            pass
        except Exception as e:
            print(f"Error syncing role with groups for user {instance.username}: {str(e)}")

def create_default_groups():
    """
    Create default groups with appropriate permissions.
    Call this in a migration or management command.
    """
    try:
        from django.contrib.auth.models import Permission
        from django.contrib.contenttypes.models import ContentType
        
        # Create Moderator group
        moderator_group, _ = Group.objects.get_or_create(name=User.Roles.MODERATOR)
        moderator_permissions = [
            # Review moderation permissions
            'change_review', 'delete_review',
            'change_reviewreport', 'delete_reviewreport',
            # Edit moderation permissions
            'change_parkedit', 'delete_parkedit',
            'change_rideedit', 'delete_rideedit',
            'change_companyedit', 'delete_companyedit',
            'change_manufactureredit', 'delete_manufactureredit',
        ]
        
        # Create Admin group
        admin_group, _ = Group.objects.get_or_create(name=User.Roles.ADMIN)
        admin_permissions = moderator_permissions + [
            # User management permissions
            'change_user', 'delete_user',
            # Content management permissions
            'add_park', 'change_park', 'delete_park',
            'add_ride', 'change_ride', 'delete_ride',
            'add_company', 'change_company', 'delete_company',
            'add_manufacturer', 'change_manufacturer', 'delete_manufacturer',
        ]
        
        # Assign permissions to groups
        for codename in moderator_permissions:
            try:
                perm = Permission.objects.get(codename=codename)
                moderator_group.permissions.add(perm)
            except Permission.DoesNotExist:
                print(f"Permission not found: {codename}")
        
        for codename in admin_permissions:
            try:
                perm = Permission.objects.get(codename=codename)
                admin_group.permissions.add(perm)
            except Permission.DoesNotExist:
                print(f"Permission not found: {codename}")
    except Exception as e:
        print(f"Error creating default groups: {str(e)}")