"""
Timeline models for tracking entity lifecycle events.
"""
import uuid
import pghistory
from django.db import models


@pghistory.track()
class EntityTimelineEvent(models.Model):
    """
    Tracks significant events in entity lifecycles (opening, closing, relocation, etc.)
    """
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    entity_id = models.UUIDField(db_index=True)
    entity_type = models.CharField(max_length=50, db_index=True)
    event_type = models.CharField(max_length=100, help_text="Type of event: opening, closing, relocation, etc.")
    event_date = models.DateField()
    event_date_precision = models.CharField(
        max_length=20,
        null=True,
        blank=True,
        choices=[
            ('day', 'Day'),
            ('month', 'Month'),
            ('year', 'Year'),
            ('decade', 'Decade'),
        ]
    )
    title = models.CharField(max_length=255)
    description = models.TextField(null=True, blank=True)
    
    # Event details - for relocations, transfers, etc.
    from_entity_id = models.UUIDField(null=True, blank=True)
    to_entity_id = models.UUIDField(null=True, blank=True)
    from_location = models.ForeignKey(
        'entities.Park',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='timeline_from_events'
    )
    to_location = models.ForeignKey(
        'entities.Park',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='timeline_to_events'
    )
    from_value = models.TextField(null=True, blank=True)
    to_value = models.TextField(null=True, blank=True)
    
    # Moderation
    is_public = models.BooleanField(default=True)
    display_order = models.IntegerField(null=True, blank=True)
    
    # Tracking
    created_by = models.ForeignKey(
        'users.User',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='timeline_events_created'
    )
    approved_by = models.ForeignKey(
        'users.User',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='timeline_events_approved'
    )
    submission = models.ForeignKey(
        'moderation.ContentSubmission',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='timeline_events'
    )
    
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        verbose_name = 'Timeline Event'
        verbose_name_plural = 'Timeline Events'
        ordering = ['-event_date', '-created_at']
        indexes = [
            models.Index(fields=['entity_type', 'entity_id', '-event_date']),
            models.Index(fields=['event_type', '-event_date']),
            models.Index(fields=['is_public', '-event_date']),
        ]
    
    def __str__(self):
        return f"{self.entity_type} {self.entity_id}: {self.title} ({self.event_date})"