from django.db import models
from django.contrib.auth.models import User
from django.core.exceptions import ValidationError

class Group(models.Model):
    GROUP_TYPE_CHOICES = [
        ('squad', 'Squad (4–12 members)'),
        ('community', 'Community (Open)'),
        ('mastermind', 'Pro Squad (Structured)'),
        ('tournament', 'Tournament Team'),
        ('private', 'Private Invite'),
    ]

    INTENT_TYPE_CHOICES = [
        ('ranked', 'Ranked Squad'),
        ('duo', 'Duo'),
        ('casual', 'Casual'),
        ('tournament', 'Tournament'),
        ('practice', 'Practice'),
    ]

    VISIBILITY_CHOICES = [
        ('public_members', 'Public (Members Only)'),
        ('private_request', 'Private (Request to Join)'),
        ('invite_only', 'Invite Only'),
    ]

    LOCATION_SCOPE_CHOICES = [
        ('local', 'Local'),
        ('virtual', 'Virtual'),
    ]

    name = models.CharField(max_length=255)
    description = models.TextField()
    group_type = models.CharField(max_length=50, choices=GROUP_TYPE_CHOICES)
    intent_type = models.CharField(max_length=50, choices=INTENT_TYPE_CHOICES)
    focus_game = models.CharField(max_length=100, blank=True, null=True)
    visibility = models.CharField(max_length=50, choices=VISIBILITY_CHOICES, default='public_members')
    capacity = models.PositiveIntegerField(null=True, blank=True)
    location_scope = models.CharField(max_length=20, choices=LOCATION_SCOPE_CHOICES, default='local')
    city = models.CharField(max_length=100, blank=True, null=True)
    state = models.CharField(max_length=100, blank=True, null=True)
    recurring_schedule = models.TextField(blank=True, null=True, help_text="Required for Mastermind groups. Use structured text or JSON.")
    created_by = models.ForeignKey(User, on_delete=models.CASCADE, related_name='created_groups_v2')
    created_at = models.DateTimeField(auto_now_add=True)
    cover_image = models.ImageField(upload_to='groups/covers/', blank=True, null=True)

    def __str__(self):
        return str(self.name)

    def clean(self):
        super().clean()
        if self.group_type == 'circle':
            if self.capacity and self.capacity > 12:
                raise ValidationError({'capacity': 'Circles cannot have more than 12 members.'})
            if not self.capacity:
                self.capacity = 12
        
        if self.group_type == 'mastermind' and not self.recurring_schedule:
            raise ValidationError({'recurring_schedule': 'Mastermind groups require a structured schedule.'})

    def save(self, *args, **kwargs):
        self.full_clean()
        super().save(*args, **kwargs)

class GroupMember(models.Model):
    ROLE_CHOICES = [
        ('member', 'Member'),
        ('moderator', 'Moderator'),
        ('owner', 'Owner'),
    ]

    STATUS_CHOICES = [
        ('active', 'Active'),
        ('pending', 'Pending'),
    ]

    group = models.ForeignKey(Group, on_delete=models.CASCADE, related_name='memberships')
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='group_memberships')
    role = models.CharField(max_length=20, choices=ROLE_CHOICES, default='member')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='active')
    joined_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        unique_together = ('group', 'user')

    def __str__(self):
        return f"{self.user.username} in {self.group.name}"

    def save(self, *args, **kwargs):
        self.full_clean()
        super().save(*args, **kwargs)

    def clean(self):
        super().clean()
        if self.status == 'active':
            # Use filter().count() instead of exclude() for new objects
            current_count = GroupMember.objects.filter(group=self.group, status='active').exclude(id=self.id).count()
            if self.group.capacity and current_count >= self.group.capacity:
                raise ValidationError('This group has reached its maximum capacity.')