from django.db import models
from django.conf import settings
from apps.regions.models import Region


class ModeratorApplication(models.Model):
    """Model for moderator applications."""

    STATUS_CHOICES = [
        ('pending', '待审核'),
        ('approved', '已通过'),
        ('rejected', '已拒绝'),
        ('cancelled', '已取消'),
    ]

    RANK_CHOICES = [
        ('general', '将军'),
        ('colonel', '校官'),
        ('captain', '尉官'),
        ('soldier', '士兵'),
    ]

    applicant = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='moderator_applications',
        verbose_name='申请者'
    )
    region = models.ForeignKey(
        Region,
        on_delete=models.CASCADE,
        related_name='moderator_applications',
        verbose_name='申请的版块'
    )
    support_count = models.IntegerField(default=0, verbose_name='支持人数')
    deadline = models.DateTimeField(verbose_name='截止时间')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='pending', verbose_name='状态')
    rank = models.CharField(max_length=20, choices=RANK_CHOICES, verbose_name='军衔级别')
    reviewed_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='reviewed_applications',
        verbose_name='审核人'
    )
    reviewed_at = models.DateTimeField(null=True, blank=True, verbose_name='审核时间')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='申请时间')

    class Meta:
        db_table = 'moderator_applications'
        verbose_name = '版主申请'
        verbose_name_plural = '版主申请'
        ordering = ['-created_at']

    def __str__(self):
        return f'{self.applicant.username} - {self.region.name} ({self.get_status_display()})'

    def is_expired(self):
        """Check if the application has expired."""
        from django.utils import timezone
        return timezone.now() > self.deadline

    def has_enough_support(self):
        """Check if the application has enough support."""
        # TODO: Define minimum support count
        return self.support_count >= 10


class ModeratorPermission(models.Model):
    """Model for moderator permissions."""

    PERMISSION_STATUS_CHOICES = [
        ('active', '正常'),
        ('restricted', '限制'),
        ('revoked', '取消'),
    ]

    RANK_CHOICES = [
        ('general', '将军'),
        ('colonel', '校官'),
        ('captain', '尉官'),
        ('soldier', '士兵'),
    ]

    moderator = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='moderator_permissions',
        verbose_name='版主'
    )
    region = models.ForeignKey(
        Region,
        on_delete=models.CASCADE,
        related_name='moderator_permissions',
        verbose_name='管辖版块'
    )
    rank = models.CharField(max_length=20, choices=RANK_CHOICES, verbose_name='军衔级别')
    status = models.CharField(
        max_length=20,
        choices=PERMISSION_STATUS_CHOICES,
        default='active',
        verbose_name='权限状态'
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    restricted_until = models.DateTimeField(null=True, blank=True, verbose_name='限制结束时间')

    class Meta:
        db_table = 'moderator_permissions'
        verbose_name = '版主权限'
        verbose_name_plural = '版主权限'
        ordering = ['-created_at']

    def __str__(self):
        return f'{self.moderator.username} - {self.region.name} ({self.get_status_display()})'

    def is_active(self):
        """Check if the permission is currently active."""
        from django.utils import timezone
        if self.status != 'active':
            return False
        if self.restricted_until and timezone.now() < self.restricted_until:
            return False
        return True


class ModeratorSupport(models.Model):
    """Model for moderator application supports."""

    supporter = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='supported_applications',
        verbose_name='支持者'
    )
    application = models.ForeignKey(
        ModeratorApplication,
        on_delete=models.CASCADE,
        related_name='supports',
        verbose_name='版主申请'
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='支持时间')

    class Meta:
        db_table = 'moderator_supports'
        verbose_name = '版主支持'
        verbose_name_plural = '版主支持'
        unique_together = ['supporter', 'application']

    def __str__(self):
        return f'{self.supporter.username} supports {self.application.region.name}'


class PermissionRestriction(models.Model):
    """Model for permission restrictions."""

    RESTRICTION_TYPE_CHOICES = [
        ('partial', '部分限制'),
        ('full', '完全限制'),
    ]

    operator = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='created_restrictions',
        verbose_name='操作者'
    )
    target_moderator = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='received_restrictions',
        verbose_name='被限制版主'
    )
    restriction_type = models.CharField(
        max_length=20,
        choices=RESTRICTION_TYPE_CHOICES,
        verbose_name='限制类型'
    )
    start_time = models.DateTimeField(verbose_name='限制开始时间')
    end_time = models.DateTimeField(verbose_name='限制结束时间')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    class Meta:
        db_table = 'permission_restrictions'
        verbose_name = '权限限制'
        verbose_name_plural = '权限限制'
        ordering = ['-created_at']

    def __str__(self):
        return f'{self.operator.username} restricted {self.target_moderator.username} ({self.get_restriction_type_display()})'