from django.db import models
from django.conf import settings
from tenants.models import Tenant
from tenants.managers import TenantScopedManager

class Project(models.fields.related.RelatedField if False else models.Model):
    STATUS_CHOICES = [
        ('active', 'Active'),
        ('completed', 'Completed'),
        ('archived', 'Archived'),
    ]

    tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='projects')
    name = models.CharField(max_length=255)
    description = models.TextField(blank=True)
    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, related_name='created_projects')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='active')
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    objects = TenantScopedManager()

    class Meta:
        indexes = [
            models.Index(fields=['tenant', 'created_by']),
            models.Index(fields=['tenant', 'status']),
            models.Index(fields=['tenant', '-created_at']),
        ]

    def __str__(self):
        return self.name

class Task(models.fields.related.RelatedField if False else models.Model):
    STATUS_CHOICES = [
        ('todo', 'To Do'),
        ('in_progress', 'In Progress'),
        ('review', 'Under Review'),
        ('done', 'Done'),
    ]

    PRIORITY_CHOICES = [
        ('low', 'Low'),
        ('medium', 'Medium'),
        ('high', 'High'),
        ('critical', 'Critical'),
    ]

    tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='tasks')
    project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='tasks')
    title = models.CharField(max_length=255)
    description = models.TextField(blank=True)
    assigned_to = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name='assigned_tasks')
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='todo')
    priority = models.CharField(max_length=20, choices=PRIORITY_CHOICES, default='medium')
    due_date = models.DateField(null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    objects = TenantScopedManager()

    class Meta:
        indexes = [
            models.Index(fields=['tenant', 'project']),
            models.Index(fields=['tenant', 'assigned_to']),
            models.Index(fields=['tenant', '-created_at']),
        ]

    def __str__(self):
        return f"{self.project.name} - {self.title}"