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


class TeamAlias(models.Model):
    """
    Historical team name aliases for resolution.
    Handles team renames, relocations, and alternate names.
    """
    ALIAS_TYPE_CHOICES = [
        ('full_name', 'Full Name'),
        ('city_name', 'City + Name'),
        ('abbreviation', 'Abbreviation'),
        ('nickname', 'Nickname'),
        ('historical', 'Historical Name'),
    ]

    team = models.ForeignKey(
        'core.Team',
        on_delete=models.CASCADE,
        related_name='aliases'
    )
    alias = models.CharField(
        max_length=200,
        help_text='The alias text to match against'
    )
    alias_type = models.CharField(
        max_length=20,
        choices=ALIAS_TYPE_CHOICES,
        default='full_name'
    )
    valid_from = models.DateField(
        null=True,
        blank=True,
        help_text='Date from which this alias is valid (inclusive)'
    )
    valid_until = models.DateField(
        null=True,
        blank=True,
        help_text='Date until which this alias is valid (inclusive)'
    )
    is_primary = models.BooleanField(
        default=False,
        help_text='Whether this is a primary/preferred alias'
    )
    source = models.CharField(
        max_length=200,
        blank=True,
        help_text='Source of this alias (e.g., ESPN, Basketball-Reference)'
    )
    notes = models.TextField(
        blank=True,
        help_text='Notes about this alias (e.g., relocation details)'
    )

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

    # Audit trail
    history = HistoricalRecords()

    class Meta:
        ordering = ['team', '-valid_from']
        verbose_name = 'Team Alias'
        verbose_name_plural = 'Team Aliases'
        indexes = [
            models.Index(fields=['alias']),
            models.Index(fields=['team', 'valid_from', 'valid_until']),
        ]

    def __str__(self):
        date_range = ""
        if self.valid_from or self.valid_until:
            start = self.valid_from.strftime('%Y') if self.valid_from else '...'
            end = self.valid_until.strftime('%Y') if self.valid_until else 'present'
            date_range = f" ({start}-{end})"
        return f"{self.alias} → {self.team.abbreviation}{date_range}"

    def is_valid_for_date(self, check_date):
        """Check if this alias is valid for a given date."""
        if self.valid_from and check_date < self.valid_from:
            return False
        if self.valid_until and check_date > self.valid_until:
            return False
        return True


class StadiumAlias(models.Model):
    """
    Historical stadium name aliases for resolution.
    Handles naming rights changes and alternate names.
    """
    ALIAS_TYPE_CHOICES = [
        ('official', 'Official Name'),
        ('former', 'Former Name'),
        ('nickname', 'Nickname'),
        ('abbreviation', 'Abbreviation'),
    ]

    stadium = models.ForeignKey(
        'core.Stadium',
        on_delete=models.CASCADE,
        related_name='aliases'
    )
    alias = models.CharField(
        max_length=200,
        help_text='The alias text to match against'
    )
    alias_type = models.CharField(
        max_length=20,
        choices=ALIAS_TYPE_CHOICES,
        default='official'
    )
    valid_from = models.DateField(
        null=True,
        blank=True,
        help_text='Date from which this alias is valid (inclusive)'
    )
    valid_until = models.DateField(
        null=True,
        blank=True,
        help_text='Date until which this alias is valid (inclusive)'
    )
    is_primary = models.BooleanField(
        default=False,
        help_text='Whether this is the current/primary name'
    )
    source = models.CharField(
        max_length=200,
        blank=True,
        help_text='Source of this alias'
    )
    notes = models.TextField(
        blank=True,
        help_text='Notes about this alias (e.g., naming rights deal)'
    )

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

    # Audit trail
    history = HistoricalRecords()

    class Meta:
        ordering = ['stadium', '-valid_from']
        verbose_name = 'Stadium Alias'
        verbose_name_plural = 'Stadium Aliases'
        indexes = [
            models.Index(fields=['alias']),
            models.Index(fields=['stadium', 'valid_from', 'valid_until']),
        ]

    def __str__(self):
        date_range = ""
        if self.valid_from or self.valid_until:
            start = self.valid_from.strftime('%Y') if self.valid_from else '...'
            end = self.valid_until.strftime('%Y') if self.valid_until else 'present'
            date_range = f" ({start}-{end})"
        return f"{self.alias} → {self.stadium.name}{date_range}"

    def is_valid_for_date(self, check_date):
        """Check if this alias is valid for a given date."""
        if self.valid_from and check_date < self.valid_from:
            return False
        if self.valid_until and check_date > self.valid_until:
            return False
        return True