import uuid
from datetime import datetime, timedelta

from django.contrib.auth.models import (
    AbstractBaseUser,
    BaseUserManager,
    PermissionsMixin,
)
from django.core.validators import RegexValidator
from django.db import models
from django.utils import timezone
from django.utils.translation import gettext as _
from foldbank.utils import get_bank_logo_file_path


# object managers
class CustomAccountManager(BaseUserManager):
    def create_user(self, username, password):
        if not username:
            raise ValueError("Users must have a username.")
        user = self.model(username=username)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, username, password):
        user = self.create_user(username, password)
        user.is_staff = True
        user.is_superuser = True
        user.save(using=self._db)
        return user



# Create your models here.
class User(AbstractBaseUser, PermissionsMixin):
    # TODO: make username case insensitive yet retain case sensitivity
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    username = models.CharField(
        max_length=32,
        unique=True,
        null=True,
        blank=True,
        validators=[
            RegexValidator(
                r"^[a-zA-Z0-9_]*$",
                message="only allows letters, numbers and underscores",
            )
        ],
        help_text=_("only allows letters, numbers and underscores"),
    )
    name = models.CharField(null=True, blank=True, max_length=128)

    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)

    date_joined = models.DateTimeField(auto_now_add=True)
    last_login = models.DateTimeField(default=timezone.now)
    last_updated = models.DateTimeField(auto_now=True)

    objects = CustomAccountManager()

    USERNAME_FIELD = "username"

    def __str__(self):
        if not self.username:
            return "USERNAME-NOT-SET"
        return self.username


class Tag(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    title = models.CharField(blank=True, null=True, max_length=64)
    sub_category = models.CharField(blank=True, null=True, max_length=64)
    icon_type = models.CharField(blank=True, null=True, max_length=64)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        ret = self.title
        if self.sub_category:
            ret += f" - {self.sub_category}"
        return ret


class Bank(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(blank=True, null=True, max_length=64)
    logo = models.FileField(
        upload_to=get_bank_logo_file_path,
        null=True,
        blank=True,
        default=None,
    )
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.name


class Account(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    created_at = models.DateTimeField(auto_now_add=True)
    user = models.ForeignKey("User", on_delete=models.PROTECT)
    bank = models.ForeignKey("Bank", on_delete=models.PROTECT)
    account_number = models.CharField(blank=True, null=True, max_length=64)
    SAVINGS_ACCOUNT = "SA"
    CURRENT_ACCOUNT = "CA"
    ACCOUNT_TYPES = [
        (SAVINGS_ACCOUNT, "Savings Account"),
        (CURRENT_ACCOUNT, "Current Account"),
    ]
    account_type = models.CharField(
        max_length=2,
        choices=ACCOUNT_TYPES,
        default=SAVINGS_ACCOUNT,
    )
    ifsc_code = models.CharField(blank=True, null=True, max_length=64)
    swift_bic = models.CharField(blank=True, null=True, max_length=64)
    holders_name = models.CharField(blank=True, null=True, max_length=64)
    USER_ACCOUNT = "UA"
    ORG_ACCOUNT = "OA"
    ACCOUNT_OWNER_TYPES = [
        (USER_ACCOUNT, "User Account"),
        (ORG_ACCOUNT, "Organization Account"),
    ]
    account_owner_type = models.CharField(
        max_length=2,
        choices=ACCOUNT_OWNER_TYPES,
        default=USER_ACCOUNT,
    )
    balance = models.FloatField(null=True, blank=True)

    def __str__(self):
        return f"{self.account_owner_type} - {self.bank} - {self.account_number} - {self.holders_name}"


class Transaction(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    created_at = models.DateTimeField(auto_now_add=True)
    amount = models.FloatField(null=True, blank=True)
    tag = models.ForeignKey("Tag", on_delete=models.PROTECT)
    from_account = models.ForeignKey(
        "Account", on_delete=models.PROTECT, related_name="transactions_from"
    )
    to_account = models.ForeignKey(
        "Account", on_delete=models.PROTECT, related_name="transactions_to"
    )

    def __str__(self):
        return f"{self.from_account.holders_name} - {self.to_account.holders_name}"



class RecurringPayment(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    from_account = models.ForeignKey(
        "Account", on_delete=models.PROTECT, related_name="recurring_payment_from"
    )
    to_account = models.ForeignKey(
        "Account", on_delete=models.PROTECT, related_name="recurring_payment_to"
    )
    frequency = models.DurationField(default=timedelta(days=30))
    amount = models.FloatField(null=True, blank=True)
    due_on = models.DateTimeField(auto_now_add=True)
    created_at = models.DateTimeField(auto_now_add=True)
    tag = models.ForeignKey("Tag", on_delete=models.PROTECT)

    def __str__(self):
        return f"{self.from_account.holders_name} - {self.to_account.holders_name}"



class RecurringPaymentTransactionLink(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    recurring_payment = models.ForeignKey("RecurringPayment", on_delete=models.PROTECT)
    transaction = models.ForeignKey("Transaction", on_delete=models.PROTECT)