from django.db import models
from django.utils import timezone
from apps.users.models import User
import uuid


class Agent(models.Model):
	STATUS_CHOICES = [
		('idle', 'Idle'),
		('running', 'Running'),
		('paused', 'Paused'),
		('completed', 'Completed'),
		('failed', 'Failed'),
	]

	uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
	user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='agents')
	name = models.CharField(max_length=255)
	description = models.TextField(blank=True, default="")
	status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='idle')
	task_id = models.CharField(max_length=255, blank=True, null=True)

	created_at = models.DateTimeField(auto_now_add=True)
	updated_at = models.DateTimeField(auto_now=True)
	started_at = models.DateTimeField(null=True, blank=True)
	completed_at = models.DateTimeField(null=True, blank=True)

	def __str__(self) -> str:
		return f"{self.name} ({self.status})"

	class Meta:
		verbose_name = "Agent"
		verbose_name_plural = "Agents"


class AgentExecution(models.Model):
	uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
	agent = models.ForeignKey(Agent, on_delete=models.CASCADE, related_name='executions')
	user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='agent_executions')

	status = models.CharField(max_length=20, choices=[
		('queued', 'Queued'),
		('running', 'Running'),
		('completed', 'Completed'),
		('failed', 'Failed'),
	], default='queued')

	input_data = models.JSONField(default=dict)
	output_data = models.JSONField(default=dict, blank=True)
	error_message = models.TextField(blank=True, default="")

	created_at = models.DateTimeField(auto_now_add=True)
	started_at = models.DateTimeField(null=True, blank=True)
	completed_at = models.DateTimeField(null=True, blank=True)

	def __str__(self) -> str:
		return f"Execution {self.uuid} - {self.agent.name} ({self.status})"

	class Meta:
		verbose_name = "Agent Execution"
		verbose_name_plural = "Agent Executions"


class AgentEvent(models.Model):
	EVENT_TYPES = [
		('started', 'Started'),
		('message', 'Message'),
		('progress', 'Progress'),
		('completed', 'Completed'),
		('error', 'Error'),
		('step', 'Step'),
	]

	uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
	execution = models.ForeignKey(AgentExecution, on_delete=models.CASCADE, related_name='events')
	event_type = models.CharField(max_length=20, choices=EVENT_TYPES)

	content = models.JSONField()
	timestamp = models.DateTimeField(auto_now_add=True)

	def __str__(self) -> str:
		return f"{self.id} - {self.event_type} - {self.execution.agent.name}"

	class Meta:
		ordering = ['timestamp']
		verbose_name = "Agent Event"
		verbose_name_plural = "Agent Events"