from django.db import models
from django.utils import timezone

class OperationLog(models.Model):
    OPERATION_LEVELS = (
        ('view', '查看'),
        ('update', '更新'),
        ('new', '新增'),
        ('delete', '删除'),
        ('download', '下载'),
        ('login', '登录'),
        ('logout', '登出'),
        ('other', '其他'),
    )
    
    OPERATION_RESULTS = (
        ('success', '成功'),
        ('failure', '失败'),
    )
    
    # 操作者信息 - 使用TextField存储用户名或标识
    operator = models.TextField(
        null=True, 
        blank=True,
        verbose_name='操作者'
    )
    operation_content = models.TextField(verbose_name='操作内容')
    operation_level = models.CharField(
        max_length=20, 
        choices=OPERATION_LEVELS, 
        verbose_name='操作级别'
    )
    operation_result = models.CharField(
        max_length=10, 
        choices=OPERATION_RESULTS, 
        default='success',
        verbose_name='操作结果'
    )
    operation_time = models.DateTimeField(default=timezone.now, verbose_name='操作时间')
    
    # 请求信息
    ip_address = models.GenericIPAddressField(null=True, blank=True, verbose_name='IP地址')
    user_agent = models.TextField(null=True, blank=True, verbose_name='用户代理')
    request_method = models.CharField(max_length=10, null=True, blank=True, verbose_name='请求方法')
    request_path = models.CharField(max_length=500, null=True, blank=True, verbose_name='请求路径')
    
    # 业务信息
    module_name = models.CharField(max_length=100, default='unknown', verbose_name='模块名称')
    object_id = models.CharField(max_length=100, null=True, blank=True, verbose_name='操作对象ID')
    
    class Meta:
        verbose_name = '操作日志'
        verbose_name_plural = '操作日志'
        ordering = ['-operation_time']
        db_table = 'operation_log'
        indexes = [
            models.Index(fields=['operation_time']),
            models.Index(fields=['operator', 'operation_time']),
            models.Index(fields=['module_name', 'operation_time']),
        ]
    
    def __str__(self):
        return f"{self.operator} - {self.operation_content} - {self.operation_time}"