from django.db import models
from django.conf import settings


class ApiRequestLog(models.Model):
    timestamp = models.DateTimeField('请求时间', auto_now_add=True, db_index=True)
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True, blank=True,
        related_name='api_request_logs',
        verbose_name='用户'
    )
    username = models.CharField('用户名', max_length=150, default='', blank=True)
    ip_address = models.GenericIPAddressField('IP地址', null=True, blank=True, db_index=True)
    user_agent = models.CharField('User-Agent', max_length=500, default='', blank=True)
    method = models.CharField('HTTP方法', max_length=10, db_index=True)
    path = models.CharField('请求路径', max_length=255, db_index=True)
    query_string = models.TextField('查询参数', default='', blank=True)
    request_body = models.TextField('请求体', default='', blank=True)
    status_code = models.IntegerField('状态码', db_index=True)
    response_size = models.IntegerField('响应大小(字节)', default=0)
    duration_ms = models.FloatField('耗时(毫秒)', db_index=True)
    app_name = models.CharField('应用模块', max_length=50, default='', blank=True, db_index=True)
    is_error = models.BooleanField('是否错误', default=False, db_index=True)

    class Meta:
        verbose_name = 'API请求日志'
        verbose_name_plural = 'API请求日志'
        ordering = ['-timestamp']
        indexes = [
            models.Index(fields=['timestamp', '-duration_ms'], name='idx_request_time_duration'),
            models.Index(fields=['status_code', 'timestamp'], name='idx_request_status_time'),
        ]

    def __str__(self):
        return f'{self.method} {self.path} - {self.status_code} ({self.duration_ms:.1f}ms)'


class ErrorLog(models.Model):
    LEVEL_CHOICES = [
        ('DEBUG', 'DEBUG'),
        ('INFO', 'INFO'),
        ('WARNING', 'WARNING'),
        ('ERROR', 'ERROR'),
        ('CRITICAL', 'CRITICAL'),
    ]

    timestamp = models.DateTimeField('发生时间', auto_now_add=True, db_index=True)
    level = models.CharField('日志级别', max_length=20, choices=LEVEL_CHOICES, default='ERROR', db_index=True)
    message = models.TextField('日志消息')
    module = models.CharField('发生模块', max_length=100, default='', blank=True, db_index=True)
    function = models.CharField('发生函数', max_length=100, default='', blank=True)
    line_number = models.IntegerField('行号', null=True, blank=True)
    exception_type = models.CharField('异常类型', max_length=200, default='', blank=True)
    traceback = models.TextField('堆栈信息', default='', blank=True)
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True, blank=True,
        related_name='error_logs',
        verbose_name='用户'
    )
    ip_address = models.GenericIPAddressField('IP地址', null=True, blank=True)
    path = models.CharField('请求路径', max_length=255, default='', blank=True)
    request_data = models.TextField('请求数据', default='', blank=True)
    is_resolved = models.BooleanField('是否已处理', default=False, db_index=True)
    resolved_at = models.DateTimeField('处理时间', null=True, blank=True)
    hash_key = models.CharField('错误Hash', max_length=64, unique=True, db_index=True)
    occurrence_count = models.IntegerField('出现次数', default=1)

    class Meta:
        verbose_name = '错误日志'
        verbose_name_plural = '错误日志'
        ordering = ['-timestamp']

    def __str__(self):
        return f'[{self.level}] {self.exception_type}: {self.message[:50]}'


class SystemEventLog(models.Model):
    EVENT_TYPE_CHOICES = [
        ('login', '用户登录'),
        ('logout', '用户登出'),
        ('register', '用户注册'),
        ('password_reset', '密码重置'),
        ('password_change', '密码修改'),
        ('profile_update', '资料更新'),
        ('phone_bind', '手机绑定'),
        ('email_bind', '邮箱绑定'),
        ('avatar_upload', '头像上传'),
        ('checkin', '每日签到'),
        ('points_change', '积分变动'),
        ('coins_change', 'y币变动'),
        ('article_create', '文章创建'),
        ('article_update', '文章更新'),
        ('article_delete', '文章删除'),
        ('comment_create', '评论创建'),
        ('favorite_add', '收藏添加'),
        ('favorite_remove', '收藏取消'),
        ('blacklist_add', '拉黑用户'),
        ('blacklist_remove', '取消拉黑'),
        ('admin_action', '管理员操作'),
        ('system_error', '系统错误'),
        ('other', '其他'),
    ]

    RESULT_CHOICES = [
        ('success', '成功'),
        ('failed', '失败'),
        ('partial', '部分成功'),
    ]

    timestamp = models.DateTimeField('事件时间', auto_now_add=True, db_index=True)
    event_type = models.CharField('事件类型', max_length=50, choices=EVENT_TYPE_CHOICES, db_index=True)
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='system_event_logs',
        verbose_name='操作用户'
    )
    target_user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True, blank=True,
        related_name='targeted_event_logs',
        verbose_name='目标用户'
    )
    description = models.CharField('描述', max_length=500, default='', blank=True)
    metadata = models.JSONField('额外数据', default=dict, blank=True)
    ip_address = models.GenericIPAddressField('IP地址', null=True, blank=True)
    user_agent = models.CharField('User-Agent', max_length=500, default='', blank=True)
    result = models.CharField('结果', max_length=20, choices=RESULT_CHOICES, default='success', db_index=True)

    class Meta:
        verbose_name = '系统事件日志'
        verbose_name_plural = '系统事件日志'
        ordering = ['-timestamp']

    def __str__(self):
        return f'{self.get_event_type_display()} - {self.user.username} ({self.get_result_display()})'