import uuid
import builtins
from django.db import models
from pgvector.django import VectorField
from django.conf import settings


class GlobalQA(models.Model):
    """Global Q&A for greetings - works across ALL properties and agencies"""
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    question = models.TextField(unique=True)
    answer = models.TextField()
    question_embedding = VectorField(dimensions=384)
    language = models.CharField(max_length=20, choices=[
        ('en', 'English'),
        ('ur', 'Roman Urdu'),
        ('both', 'Both')
    ], default='both')
    is_active = models.BooleanField(default=True)
    priority = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    
    class Meta:
        ordering = ['-priority', 'question']
        indexes = [
            models.Index(fields=['is_active', '-priority']),
            models.Index(fields=['language', 'is_active']),
        ]
    
    def __str__(self):
        return f"{self.question[:50]}"


class MasterQuestion(models.Model):
    """Pre-defined questions created by admin that agencies must answer"""
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    question = models.TextField(unique=True)
    is_active = models.BooleanField(default=True)
    order = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ['order']
        indexes = [
            models.Index(fields=['is_active', 'order']),
        ]
    
    def __str__(self):
        return self.question[:100]


class PropertyQA(models.Model):
    """Agency's answers to master questions for a specific property"""
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    
    agency = models.ForeignKey(
        settings.AUTH_USER_MODEL, 
        on_delete=models.CASCADE, 
        related_name='property_qa_answers'
    )
    property = models.ForeignKey(
        'Property.Property', 
        on_delete=models.CASCADE, 
        related_name='ai_qa'
    )
    master_question = models.ForeignKey(
        MasterQuestion, 
        on_delete=models.CASCADE, 
        null=True, 
        blank=True
    )
    answer = models.TextField()
    
    # Embedding for similarity search
    question_embedding = VectorField(dimensions=384)
    
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)  # FIX #5: Track updates
    
    class Meta:
        unique_together = ['property', 'master_question']
        # FIX #2: Database indexes for performance
        indexes = [
            models.Index(fields=['property', 'is_active']),
            models.Index(fields=['agency', 'is_active']),
            models.Index(fields=['master_question', 'is_active']),
            # Vector index will be added via migration
        ]
    
    @builtins.property
    def question_text(self):
        return self.master_question.question if self.master_question else None
    
    def __str__(self):
        return f"{self.property.title}: {self.question_text[:50] if self.question_text else 'No question'}"


class AgencyAutoChatSetting(models.Model):
    """Auto-chat settings per agency"""
    agency = models.OneToOneField(
        settings.AUTH_USER_MODEL, 
        on_delete=models.CASCADE, 
        related_name='auto_chat_setting'
    )
    is_enabled = models.BooleanField(default=False)
    delay_seconds = models.IntegerField(default=30, help_text="Seconds to wait before AI replies")
    confidence_threshold = models.FloatField(default=0.6, help_text="Minimum similarity score (0-1)")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        indexes = [
            models.Index(fields=['is_enabled']),
        ]
    
    def __str__(self):
        return f"{self.agency.email}: {'ON' if self.is_enabled else 'OFF'}"


class PropertyAutoChatState(models.Model):
    """Track auto-chat state per property"""
    property = models.OneToOneField(
        'Property.Property', 
        on_delete=models.CASCADE, 
        related_name='auto_chat_state'
    )
    is_auto_chat_enabled = models.BooleanField(default=False)
    last_auto_reply_at = models.DateTimeField(null=True, blank=True)
    total_auto_replies = models.IntegerField(default=0)
    last_agency_reply_at = models.DateTimeField(null=True, blank=True)  
    
    class Meta:
        indexes = [
            models.Index(fields=['is_auto_chat_enabled']),
            models.Index(fields=['property', 'is_auto_chat_enabled']),
        ]
    
    def __str__(self):
        return f"{self.property.title}: Auto Chat {'ON' if self.is_auto_chat_enabled else 'OFF'}"


class PropertyCustomQA(models.Model):
    """
    Custom Q&A for a specific property (max 5 per property)
    Agency writes these when enabling auto-chat
    """
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    
    # Relationships
    agency = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='property_custom_qa'
    )
    property = models.ForeignKey(
        'Property.Property',
        on_delete=models.CASCADE,
        related_name='custom_qa'
    )
    
    # The actual Q&A
    question = models.TextField()
    answer = models.TextField()
    
    # For AI similarity search
    question_embedding = VectorField(dimensions=384)
    
    # Metadata
    order = models.IntegerField(default=0)  # 1-5 for display order
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['order']
        # Ensure max 5 per property
        constraints = [
            models.UniqueConstraint(
                fields=['property', 'order'],
                name='unique_order_per_property'
            )
        ]
        indexes = [
            models.Index(fields=['property', 'is_active']),
            models.Index(fields=['agency', 'is_active']),
        ]
    
    def __str__(self):
        return f"{self.property.title}: Q{self.order} - {self.question[:50]}"