import uuid

from django.db import models


class Account(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    uid = models.CharField(max_length=48, unique=True)
    email = models.EmailField()
    ldap_dn = models.CharField(max_length=1024, blank=True)
    ldap_uuid = models.CharField(max_length=64, unique=True, null=True, blank=True)
    oidc_issuer = models.CharField(max_length=2048, blank=True, default="")
    oidc_sub = models.CharField(max_length=512, unique=True, null=True)
    membership_level = models.PositiveSmallIntegerField(default=0)
    stripe_customer = models.CharField(max_length=128, unique=True, null=True)
    checkout_id = models.CharField(max_length=128, blank=True)
    checkout_key = models.UUIDField(default=uuid.uuid4)
    last_billing_sync = models.DateTimeField(null=True)
    last_shkeeper_sync = models.DateTimeField(null=True)
    last_ldap_sync = models.DateTimeField(null=True)
    created_at = models.DateTimeField(auto_now_add=True)


class Registration(models.Model):
    token_hash = models.CharField(max_length=64, primary_key=True)
    uid = models.CharField(max_length=48)
    email = models.EmailField()
    expires_at = models.DateTimeField(db_index=True)


class RateWindow(models.Model):
    key = models.CharField(max_length=64, primary_key=True)
    count = models.PositiveIntegerField(default=0)
    expires_at = models.DateTimeField(db_index=True)


class Subscription(models.Model):
    stripe_id = models.CharField(max_length=128, primary_key=True)
    account = models.ForeignKey(Account, on_delete=models.CASCADE, related_name="subscriptions")
    tier = models.CharField(max_length=48, blank=True)
    status = models.CharField(max_length=32)
    paid_until = models.DateTimeField(null=True)
    cancel_at_period_end = models.BooleanField(default=False)


class ManagedGroup(models.Model):
    """Retain old mappings so removing a tier from config also revokes its group."""

    account = models.ForeignKey(Account, on_delete=models.CASCADE, related_name="managed_groups")
    dn = models.CharField(max_length=1024)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["account", "dn"], name="unique_account_group")]


class CryptoInvoice(models.Model):
    """Immutable prepaid order; one canonical invoice can grant one month only."""

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    account = models.ForeignKey(Account, on_delete=models.PROTECT)
    tier = models.CharField(max_length=48)
    usd_amount = models.DecimalField(max_digits=12, decimal_places=2)
    crypto = models.CharField(max_length=32)
    provider_id = models.CharField(max_length=128, blank=True)
    wallet = models.CharField(max_length=512, blank=True)
    crypto_amount = models.CharField(max_length=128, blank=True)
    # SHKeeper invoices do not expire. Keep incomplete orders available for late
    # payments; never silently discard a deposit address with money on the way.
    status = models.CharField(max_length=24, default="creating")
    credited_at = models.DateTimeField(null=True)
    access_start = models.DateTimeField(null=True)
    access_end = models.DateTimeField(null=True, db_index=True)
    last_checked_at = models.DateTimeField(null=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        constraints = [models.UniqueConstraint(fields=["account"], condition=models.Q(credited_at__isnull=True), name="one_uncredited_crypto_invoice")]


class WebhookEvent(models.Model):
    stripe_id = models.CharField(max_length=128, primary_key=True)
    account = models.ForeignKey(Account, on_delete=models.CASCADE, null=True)
    received_at = models.DateTimeField(auto_now_add=True)
    processed_at = models.DateTimeField(null=True)