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

# 引入loguru库用于日志记录
try:
    from loguru import logger
except ImportError:
    import logging
    logger = logging.getLogger(__name__)

class ServiceGroup(models.Model):
    name = models.CharField(max_length=100, unique=True, verbose_name="服务分组")
    description = models.TextField(blank=True, null=True, verbose_name="描述")
    
    def __str__(self):
        return self.name
    
    class Meta:
        verbose_name = '服务分组'
        verbose_name_plural = '服务分组'

class Service(models.Model):
    STATUS_CHOICES = [
        ('UP', '正常'),
        ('DOWN', '故障'),
        ('UNKNOWN', '未知'),
    ]
    
    name = models.CharField(max_length=200, verbose_name="服务名称")
    group = models.ForeignKey(ServiceGroup, on_delete=models.CASCADE, related_name='services', verbose_name="所属分组")
    host = models.CharField(max_length=255, verbose_name="主机/IP")
    port = models.PositiveIntegerField(null=True, blank=True, verbose_name="端口（可选）")
    check_type = models.CharField(max_length=50, default='ping', choices=[
        ('ping', 'Ping检测'),
        ('tcp', 'TCP端口检测'),
        ('http', 'HTTP请求'),
        ('custom', '自定义脚本'),
    ], verbose_name="检测类型")
    description = models.TextField(blank=True, null=True, verbose_name="描述")
    is_active = models.BooleanField(default=True, verbose_name="是否启用监控")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    
    def __str__(self):
        return f"{self.name} ({self.host})"
    
    def get_latest_status(self):
        """获取最新状态"""
        latest_record = self.records.first()
        if latest_record:
            return latest_record.status
        return 'UNKNOWN'
    
    def get_latest_check_time(self):
        """获取最新检测时间"""
        latest_record = self.records.first()
        if latest_record:
            return latest_record.checked_at
        return None
    
    def get_latest_response_time(self):
        """获取最新响应时间"""
        latest_record = self.records.first()
        if latest_record:
            return latest_record.response_time
        return None
    
    class Meta:
        verbose_name = '服务'
        verbose_name_plural = '服务'

class ServiceCheckRecord(models.Model):
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name='records')
    status = models.CharField(max_length=10, choices=Service.STATUS_CHOICES, verbose_name="状态")
    response_time = models.FloatField(null=True, blank=True, verbose_name="响应时间(ms)")
    message = models.TextField(blank=True, null=True, verbose_name="返回信息/错误原因")
    checked_at = models.DateTimeField(default=timezone.now, verbose_name="检测时间")
    
    class Meta:
        ordering = ['-checked_at']
        verbose_name = '服务检测记录'
        verbose_name_plural = '服务检测记录'
    
    def __str__(self):
        return f"{self.service.name} - {self.status} at {self.checked_at}"
    
    def save(self, *args, **kwargs):
        logger.info(f"保存服务检测记录: {self.service.name}, 状态: {self.status}, 响应时间: {self.response_time}ms")
        super().save(*args, **kwargs)