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

# Status choices for tasks
STATUS_CHOICES = [
    ('pending', '待分配'),
    ('assigned', '已分配'),
    ('running', '执行中'),
    ('success', '成功'),
    ('failed', '失败'),
    ('retrying', '重试中'),
    ('timeout', '超时，关闭'),
]

class Client(models.Model):
    name = models.CharField(max_length=100, unique=True, verbose_name='客户端标识')
    token = models.CharField(max_length=128, verbose_name='API Token')
    last_seen = models.DateTimeField(auto_now=True, verbose_name='最后活跃时间')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    def __str__(self):
        return self.name
    
    def save(self, *args, **kwargs):
        # Generate a unique token if this is a new client
        if not self.pk and not self.token:
            # Use secrets module to generate a secure random token
            self.token = secrets.token_urlsafe(64)  # 64 bytes -> ~86 characters
        super().save(*args, **kwargs)

    class Meta:
        verbose_name = '客户端'
        verbose_name_plural = '客户端'

class Task(models.Model):
    name = models.CharField(max_length=200, verbose_name='任务名称')
    client_name = models.CharField(max_length=100, null=True, blank=True, verbose_name='指定执行客户端')
    script = models.TextField(null=True, blank=True, verbose_name='执行脚本')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='pending', verbose_name='任务状态')
    timeout_seconds = models.IntegerField(default=259200, verbose_name='超时时间（秒）')  # 默认3天
    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')
    assigned_to = models.CharField(max_length=100, null=True, blank=True, verbose_name='实际执行客户端')
    started_at = models.DateTimeField(null=True, blank=True, verbose_name='开始执行时间')
    completed_at = models.DateTimeField(null=True, blank=True, verbose_name='完成时间')

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = '任务'
        verbose_name_plural = '任务'

class TaskResult(models.Model):
    task = models.ForeignKey(Task, on_delete=models.CASCADE, related_name='results', verbose_name='关联任务')
    client = models.ForeignKey(Client, on_delete=models.CASCADE, verbose_name='执行客户端')
    result_file = models.FileField(upload_to='task_results/', null=True, blank=True, verbose_name='结果文件')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, verbose_name='执行状态')
    message = models.TextField(null=True, blank=True, verbose_name='执行消息')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    def __str__(self):
        return f"{self.task.name} - {self.client.name} - {self.status}"

    class Meta:
        verbose_name = '任务结果'
        verbose_name_plural = '任务结果'