"""
Notification Models for IGNY8

This module provides a notification system for tracking AI operations,
workflow events, and system alerts.
"""

from django.db import models
from django.conf import settings
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType

from igny8_core.auth.models import AccountBaseModel


class NotificationType(models.TextChoices):
    """Notification type choices"""
    # AI Operations
    AI_CLUSTER_COMPLETE = 'ai_cluster_complete', 'Clustering Complete'
    AI_CLUSTER_FAILED = 'ai_cluster_failed', 'Clustering Failed'
    AI_IDEAS_COMPLETE = 'ai_ideas_complete', 'Ideas Generated'
    AI_IDEAS_FAILED = 'ai_ideas_failed', 'Idea Generation Failed'
    AI_CONTENT_COMPLETE = 'ai_content_complete', 'Content Generated'
    AI_CONTENT_FAILED = 'ai_content_failed', 'Content Generation Failed'
    AI_IMAGES_COMPLETE = 'ai_images_complete', 'Images Generated'
    AI_IMAGES_FAILED = 'ai_images_failed', 'Image Generation Failed'
    AI_PROMPTS_COMPLETE = 'ai_prompts_complete', 'Image Prompts Created'
    AI_PROMPTS_FAILED = 'ai_prompts_failed', 'Image Prompts Failed'
    
    # Workflow
    CONTENT_READY_REVIEW = 'content_ready_review', 'Content Ready for Review'
    CONTENT_PUBLISHED = 'content_published', 'Content Published'
    CONTENT_PUBLISH_FAILED = 'content_publish_failed', 'Publishing Failed'
    
    # WordPress Sync
    WORDPRESS_SYNC_SUCCESS = 'wordpress_sync_success', 'WordPress Sync Complete'
    WORDPRESS_SYNC_FAILED = 'wordpress_sync_failed', 'WordPress Sync Failed'
    
    # Credits/Billing
    CREDITS_LOW = 'credits_low', 'Credits Running Low'
    CREDITS_DEPLETED = 'credits_depleted', 'Credits Depleted'
    
    # Setup
    SITE_SETUP_COMPLETE = 'site_setup_complete', 'Site Setup Complete'
    KEYWORDS_IMPORTED = 'keywords_imported', 'Keywords Imported'
    
    # System
    SYSTEM_INFO = 'system_info', 'System Information'


class NotificationSeverity(models.TextChoices):
    """Notification severity choices"""
    INFO = 'info', 'Info'
    SUCCESS = 'success', 'Success'
    WARNING = 'warning', 'Warning'
    ERROR = 'error', 'Error'


class Notification(AccountBaseModel):
    """
    Notification model for tracking events and alerts
    
    Notifications are account-scoped (via AccountBaseModel) and can optionally target specific users.
    They support generic relations to link to any related object.
    """
    
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name='notifications',
        help_text='If null, notification is visible to all account users'
    )
    
    # Notification content
    notification_type = models.CharField(
        max_length=50,
        choices=NotificationType.choices,
        default=NotificationType.SYSTEM_INFO
    )
    title = models.CharField(max_length=200)
    message = models.TextField()
    severity = models.CharField(
        max_length=20,
        choices=NotificationSeverity.choices,
        default=NotificationSeverity.INFO
    )
    
    # Related site (optional)
    site = models.ForeignKey(
        'igny8_core_auth.Site',
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name='notifications'
    )
    
    # Generic relation to any object
    content_type = models.ForeignKey(
        ContentType,
        on_delete=models.CASCADE,
        null=True,
        blank=True
    )
    object_id = models.PositiveIntegerField(null=True, blank=True)
    content_object = GenericForeignKey('content_type', 'object_id')
    
    # Action
    action_url = models.CharField(max_length=500, null=True, blank=True)
    action_label = models.CharField(max_length=50, null=True, blank=True)
    
    # Status
    is_read = models.BooleanField(default=False)
    read_at = models.DateTimeField(null=True, blank=True)
    
    # Metadata for counts/details
    metadata = models.JSONField(default=dict, blank=True)
    
    class Meta:
        ordering = ['-created_at']
        indexes = [
            models.Index(fields=['account', '-created_at']),
            models.Index(fields=['account', 'is_read', '-created_at']),
            models.Index(fields=['user', '-created_at']),
        ]
    
    def __str__(self):
        return f"{self.title} ({self.notification_type})"
    
    def mark_as_read(self):
        """Mark notification as read"""
        if not self.is_read:
            from django.utils import timezone
            self.is_read = True
            self.read_at = timezone.now()
            self.save(update_fields=['is_read', 'read_at', 'updated_at'])
    
    @classmethod
    def create_notification(
        cls,
        account,
        notification_type: str,
        title: str,
        message: str,
        severity: str = NotificationSeverity.INFO,
        user=None,
        site=None,
        content_object=None,
        action_url: str = None,
        action_label: str = None,
        metadata: dict = None
    ):
        """
        Factory method to create notifications
        
        Args:
            account: The account this notification belongs to
            notification_type: Type from NotificationType choices
            title: Notification title
            message: Notification message body
            severity: Severity level from NotificationSeverity choices
            user: Optional specific user (if None, visible to all account users)
            site: Optional related site
            content_object: Optional related object (using GenericForeignKey)
            action_url: Optional URL for action button
            action_label: Optional label for action button
            metadata: Optional dict with additional data (counts, etc.)
        
        Returns:
            Created Notification instance
        """
        notification = cls(
            account=account,
            user=user,
            notification_type=notification_type,
            title=title,
            message=message,
            severity=severity,
            site=site,
            action_url=action_url,
            action_label=action_label,
            metadata=metadata or {}
        )
        
        if content_object:
            notification.content_type = ContentType.objects.get_for_model(content_object)
            notification.object_id = content_object.pk
        
        notification.save()
        return notification