from django.db import models
from simple_history.models import HistoricalRecords


class ManualReviewItem(models.Model):
    """
    Items that require manual review before resolution.
    """
    ITEM_TYPE_CHOICES = [
        ('team', 'Team'),
        ('stadium', 'Stadium'),
    ]

    STATUS_CHOICES = [
        ('pending', 'Pending Review'),
        ('resolved', 'Resolved'),
        ('ignored', 'Ignored'),
        ('new_entity', 'Created New Entity'),
    ]

    REASON_CHOICES = [
        ('no_match', 'No Match Found'),
        ('low_confidence', 'Low Confidence Match'),
        ('ambiguous', 'Ambiguous Match'),
        ('new_entity', 'Potentially New Entity'),
    ]

    job = models.ForeignKey(
        'scraper.ScrapeJob',
        on_delete=models.CASCADE,
        related_name='review_items',
        null=True,
        blank=True,
        help_text='Job that created this review item'
    )
    item_type = models.CharField(
        max_length=20,
        choices=ITEM_TYPE_CHOICES
    )
    sport = models.ForeignKey(
        'core.Sport',
        on_delete=models.CASCADE,
        related_name='review_items'
    )

    # Raw value from scraping
    raw_value = models.CharField(
        max_length=300,
        help_text='Original scraped value'
    )

    # Suggested resolution
    suggested_id = models.CharField(
        max_length=100,
        blank=True,
        help_text='Suggested canonical ID (if any match found)'
    )
    confidence = models.FloatField(
        default=0.0,
        help_text='Match confidence (0.0 - 1.0)'
    )
    reason = models.CharField(
        max_length=20,
        choices=REASON_CHOICES,
        help_text='Why manual review is needed'
    )

    # Context
    source_url = models.URLField(
        blank=True,
        help_text='URL where this value was found'
    )
    check_date = models.DateField(
        null=True,
        blank=True,
        help_text='Date context for alias resolution'
    )
    context = models.JSONField(
        null=True,
        blank=True,
        help_text='Additional context (e.g., game info)'
    )

    # Resolution
    status = models.CharField(
        max_length=20,
        choices=STATUS_CHOICES,
        default='pending'
    )
    resolved_to = models.CharField(
        max_length=100,
        blank=True,
        help_text='Final resolved canonical ID'
    )
    resolved_by = models.ForeignKey(
        'auth.User',
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='resolved_review_items'
    )
    resolved_at = models.DateTimeField(null=True, blank=True)
    resolution_notes = models.TextField(
        blank=True,
        help_text='Notes about the resolution'
    )
    create_alias = models.BooleanField(
        default=False,
        help_text='Whether to create an alias from this resolution'
    )

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    # Audit trail
    history = HistoricalRecords()

    class Meta:
        ordering = ['-created_at']
        verbose_name = 'Manual Review Item'
        verbose_name_plural = 'Manual Review Items'
        indexes = [
            models.Index(fields=['status', 'item_type']),
            models.Index(fields=['sport', 'status']),
            models.Index(fields=['raw_value']),
        ]

    def __str__(self):
        return f"{self.item_type}: {self.raw_value} ({self.get_status_display()})"

    @property
    def confidence_display(self):
        """Return confidence as percentage string."""
        return f"{self.confidence * 100:.0f}%"

    def resolve(self, canonical_id, user=None, notes='', create_alias=False):
        """Resolve this review item."""
        from django.utils import timezone
        self.status = 'resolved'
        self.resolved_to = canonical_id
        self.resolved_by = user
        self.resolved_at = timezone.now()
        self.resolution_notes = notes
        self.create_alias = create_alias
        self.save()

        # Optionally create alias
        if create_alias and canonical_id:
            self._create_alias(canonical_id)

    def _create_alias(self, canonical_id):
        """Create an alias from this resolution."""
        from core.models import TeamAlias, StadiumAlias, Team, Stadium

        if self.item_type == 'team':
            try:
                team = Team.objects.get(id=canonical_id)
                TeamAlias.objects.get_or_create(
                    team=team,
                    alias=self.raw_value,
                    defaults={
                        'alias_type': 'historical',
                        'source': 'manual_review',
                        'notes': f'Created from review item #{self.id}',
                    }
                )
            except Team.DoesNotExist:
                pass
        elif self.item_type == 'stadium':
            try:
                stadium = Stadium.objects.get(id=canonical_id)
                StadiumAlias.objects.get_or_create(
                    stadium=stadium,
                    alias=self.raw_value,
                    defaults={
                        'alias_type': 'former',
                        'source': 'manual_review',
                        'notes': f'Created from review item #{self.id}',
                    }
                )
            except Stadium.DoesNotExist:
                pass

    def ignore(self, user=None, notes=''):
        """Mark this review item as ignored."""
        from django.utils import timezone
        self.status = 'ignored'
        self.resolved_by = user
        self.resolved_at = timezone.now()
        self.resolution_notes = notes
        self.save()