from django.contrib.auth.models import AbstractUser
from django.db import models


class Team(models.Model):
    """团队模型 — 额度管理的核心单位。"""
    name = models.CharField(max_length=100, unique=True, verbose_name='团队名称')
    total_seconds_pool = models.BigIntegerField(default=0, verbose_name='总额度池(秒)')
    total_seconds_used = models.FloatField(default=0, verbose_name='已消耗总秒数')
    monthly_seconds_limit = models.IntegerField(default=6000, verbose_name='每月消费上限(秒)')
    daily_member_limit_default = models.IntegerField(default=600, verbose_name='新成员默认每日限额(秒)')
    is_active = models.BooleanField(default=True, verbose_name='启用状态')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    updated_at = models.DateTimeField(auto_now=True, verbose_name='更新时间')

    class Meta:
        verbose_name = '团队'
        verbose_name_plural = '团队'

    def __str__(self):
        return self.name

    @property
    def remaining_seconds(self):
        return self.total_seconds_pool - self.total_seconds_used


class User(AbstractUser):
    """Extended user model — Phase 5: team-based quota."""
    email = models.EmailField(unique=True, verbose_name='邮箱')
    team = models.ForeignKey(
        Team, on_delete=models.SET_NULL,
        null=True, blank=True,
        related_name='members',
        verbose_name='所属团队',
    )
    is_team_admin = models.BooleanField(default=False, verbose_name='团队管理员')
    daily_seconds_limit = models.IntegerField(default=600, verbose_name='每日秒数上限')
    monthly_seconds_limit = models.IntegerField(default=6000, verbose_name='每月秒数上限')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    updated_at = models.DateTimeField(auto_now=True, verbose_name='更新时间')

    class Meta:
        verbose_name = '用户'
        verbose_name_plural = '用户'

    def __str__(self):
        return self.username

    @property
    def role(self):
        if self.is_staff and self.team is None:
            return 'super_admin'
        if self.is_team_admin and self.team is not None:
            return 'team_admin'
        return 'member'


class AdminAuditLog(models.Model):
    """管理员操作审计日志"""
    ACTION_CHOICES = [
        ('team_create', '创建团队'),
        ('team_update', '更新团队'),
        ('team_topup', '团队充值'),
        ('team_set_pool', '设置团队额度池'),
        ('team_create_admin', '创建团队管理员'),
        ('user_create', '创建用户'),
        ('user_quota_update', '更新用户额度'),
        ('user_status_toggle', '切换用户状态'),
        ('settings_update', '更新系统设置'),
        ('member_create', '创建团队成员'),
        ('member_quota_update', '更新成员额度'),
        ('member_status_toggle', '切换成员状态'),
    ]

    operator = models.ForeignKey(
        User, on_delete=models.SET_NULL,
        null=True, related_name='audit_logs',
        verbose_name='操作人',
    )
    operator_name = models.CharField(max_length=150, verbose_name='操作人用户名')
    action = models.CharField(max_length=30, choices=ACTION_CHOICES, verbose_name='操作类型')
    target_type = models.CharField(max_length=20, verbose_name='目标类型')
    target_id = models.IntegerField(null=True, blank=True, verbose_name='目标ID')
    target_name = models.CharField(max_length=200, blank=True, default='', verbose_name='目标名称')
    before = models.JSONField(null=True, blank=True, verbose_name='变更前')
    after = models.JSONField(null=True, blank=True, verbose_name='变更后')
    ip_address = models.GenericIPAddressField(null=True, blank=True, verbose_name='IP地址')
    created_at = models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='操作时间')

    class Meta:
        verbose_name = '审计日志'
        verbose_name_plural = '审计日志'
        ordering = ['-created_at']

    def __str__(self):
        return f'{self.operator_name} - {self.get_action_display()} - {self.target_name}'


def log_admin_action(request, action, target_type, target_id=None, target_name='', before=None, after=None):
    """记录管理员操作日志"""
    ip = request.META.get('HTTP_X_FORWARDED_FOR', '').split(',')[0].strip() or request.META.get('REMOTE_ADDR')
    AdminAuditLog.objects.create(
        operator=request.user,
        operator_name=request.user.username,
        action=action,
        target_type=target_type,
        target_id=target_id,
        target_name=target_name,
        before=before,
        after=after,
        ip_address=ip,
    )