import secrets

from django.contrib.auth.models import AbstractUser
from django.db import models

from accounts.manager import UserManager
from partner.models import Partner

EVENTIFY_ID_CHARS = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'  # no I, O, 0, 1


def generate_eventify_id():
    return 'EVT-' + ''.join(secrets.choice(EVENTIFY_ID_CHARS) for _ in range(8))


ROLE_CHOICES = (
        ('admin', 'Admin'),
        ('manager', 'Manager'),
        ('staff', 'Staff'),
        ('customer', 'Customer'),
        ('partner', 'Partner'),
        ('partner_manager', 'Partner Manager'),
        ('partner_staff', 'Partner Staff'),
        ('partner_customer', 'Partner Customer'),
    )

class User(AbstractUser):
    eventify_id = models.CharField(
        max_length=12,
        unique=True,
        editable=False,
        db_index=True,
        null=True,
        blank=True,
    )

    phone_number = models.CharField(max_length=15, blank=True, null=True)
    role = models.CharField(max_length=20, choices=ROLE_CHOICES, default='Staff')

    partner = models.ForeignKey(Partner, on_delete=models.CASCADE, blank=True, null=True)

    is_staff = models.BooleanField(default=False)
    is_customer = models.BooleanField(default=False)
    is_user = models.BooleanField(default=False)

    # Location fields
    pincode = models.CharField(max_length=10, blank=True, null=True)
    district = models.CharField(max_length=100, blank=True, null=True)
    state = models.CharField(max_length=100, blank=True, null=True)
    country = models.CharField(max_length=100, blank=True, null=True)
    place = models.CharField(max_length=200, blank=True, null=True)

    # Location fields
    latitude = models.DecimalField(max_digits=9, decimal_places=6, blank=True, null=True)
    longitude = models.DecimalField(max_digits=9, decimal_places=6, blank=True, null=True)

    profile_picture = models.ImageField(upload_to='profile_pictures/', blank=True, null=True, default='default.png')

    allowed_modules = models.TextField(
        blank=True, null=True,
        help_text='Comma-separated module slugs this user can access',
    )

    ALL_MODULES = ["dashboard", "partners", "events", "ad-control", "users", "reviews", "contributions", "financials", "settings"]

    def get_allowed_modules(self):
        ALL = ["dashboard", "partners", "events", "ad-control", "users", "reviews", "contributions", "financials", "settings"]
        if self.is_superuser or self.role == "admin":
            return ALL
        if self.allowed_modules:
            return [m.strip() for m in self.allowed_modules.split(",") if m.strip()]
        if self.role == "manager":
            return ALL
        return []

    objects = UserManager()

    def save(self, *args, **kwargs):
        if not self.eventify_id:
            for _ in range(10):
                candidate = generate_eventify_id()
                if not User.objects.filter(eventify_id=candidate).exists():
                    self.eventify_id = candidate
                    break
        super().save(*args, **kwargs)

    def __str__(self):
        return self.username