import stripe
from django.conf import settings
from django.contrib.auth.models import AbstractUser
from django.db import models

from core.exchanges.alpaca import AlpacaExchange
from core.exchanges.oanda import OANDAExchange
from core.lib.customers import get_or_create, update_customer_fields
from core.util import logs

log = logs.get_logger(__name__)
EXCHANGE_MAP = {"alpaca": AlpacaExchange, "oanda": OANDAExchange}
TYPE_CHOICES = (
    ("market", "Market"),
    ("limit", "Limit"),
)
DIRECTION_CHOICES = (
    ("buy", "Buy"),
    ("sell", "Sell"),
)
TIF_CHOICES = (
    ("gtc", "GTC (Good Til Cancelled)"),
    ("gfd", "GFD (Good For Day)"),
    ("fok", "FOK (Fill Or Kill)"),
    ("ioc", "IOC (Immediate Or Cancel)"),
)


class Plan(models.Model):
    name = models.CharField(max_length=255, unique=True)
    description = models.CharField(max_length=1024, null=True, blank=True)
    cost = models.IntegerField()
    product_id = models.CharField(max_length=255, unique=True, null=True, blank=True)
    image = models.CharField(max_length=1024, null=True, blank=True)

    def __str__(self):
        return f"{self.name} (£{self.cost})"


class User(AbstractUser):
    # Stripe customer ID
    stripe_id = models.CharField(max_length=255, null=True, blank=True)
    last_payment = models.DateTimeField(null=True, blank=True)
    plans = models.ManyToManyField(Plan, blank=True)
    email = models.EmailField(unique=True)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._original = self

    def save(self, *args, **kwargs):
        """
        Override the save function to create a Stripe customer.
        """
        if settings.STRIPE_ENABLED:
            if not self.stripe_id:  # stripe ID not stored
                self.stripe_id = get_or_create(
                    self.email, self.first_name, self.last_name
                )

            to_update = {}
            if self.email != self._original.email:
                to_update["email"] = self.email
            if self.first_name != self._original.first_name:
                to_update["first_name"] = self.first_name
            if self.last_name != self._original.last_name:
                to_update["last_name"] = self.last_name

            update_customer_fields(self.stripe_id, **to_update)

        super().save(*args, **kwargs)

    def delete(self, *args, **kwargs):
        if settings.STRIPE_ENABLED:
            if self.stripe_id:
                stripe.Customer.delete(self.stripe_id)
                log.info(f"Deleted Stripe customer {self.stripe_id}")
        super().delete(*args, **kwargs)

    def has_plan(self, plan):
        plan_list = [plan.name for plan in self.plans.all()]
        return plan in plan_list


class Account(models.Model):
    EXCHANGE_CHOICES = (("alpaca", "Alpaca"), ("oanda", "OANDA"))
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    name = models.CharField(max_length=255)
    exchange = models.CharField(choices=EXCHANGE_CHOICES, max_length=255)
    api_key = models.CharField(max_length=255)
    api_secret = models.CharField(max_length=255)
    sandbox = models.BooleanField(default=False)
    supported_symbols = models.JSONField(default=list)
    instruments = models.JSONField(default=list)
    currency = models.CharField(max_length=255, null=True, blank=True)

    def __str__(self):
        name = f"{self.name} ({self.exchange})"
        if self.sandbox:
            name += " (sandbox)"
        return name

    def update_info(self, save=True):
        client = self.get_client()
        if client:
            response = client.get_instruments()
            supported_symbols = client.get_supported_assets(response)
            currency = client.get_account()["currency"]
            log.debug(f"Supported symbols for {self.name}: {supported_symbols}")
            self.supported_symbols = supported_symbols
            self.instruments = response
            self.currency = currency
        if save:
            self.save()

    def save(self, *args, **kwargs):
        """
        Override the save function to update supported symbols.
        """
        self.update_info(save=False)
        super().save(*args, **kwargs)

    def get_client(self):
        if self.exchange in EXCHANGE_MAP:
            return EXCHANGE_MAP[self.exchange](self)
        else:
            raise Exception(f"Exchange not supported : {self.exchange}")

    @property
    def client(self):
        """
        Convenience property for one-off API calls.
        """
        return self.get_client()

    @property
    def rawclient(self):
        """
        Convenience property for one-off API calls.
        """
        return self.get_client().client

    @classmethod
    def get_by_id(cls, account_id, user):
        return cls.objects.get(id=account_id, user=user)


class Session(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    request = models.CharField(max_length=255, null=True, blank=True)
    session = models.CharField(max_length=255, null=True, blank=True)
    subscription_id = models.CharField(max_length=255, null=True, blank=True)
    plan = models.ForeignKey(Plan, null=True, blank=True, on_delete=models.CASCADE)


class Hook(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    name = models.CharField(max_length=1024, null=True, blank=True, unique=True)
    hook = models.CharField(max_length=255, unique=True)
    direction = models.CharField(choices=DIRECTION_CHOICES, max_length=255)
    received = models.IntegerField(default=0)

    def __str__(self):
        return f"{self.name} ({self.hook})"


class Trade(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    account = models.ForeignKey(Account, on_delete=models.CASCADE)
    hook = models.ForeignKey(Hook, on_delete=models.CASCADE, null=True, blank=True)
    symbol = models.CharField(max_length=255)
    time_in_force = models.CharField(choices=TIF_CHOICES, max_length=255, default="gtc")
    type = models.CharField(choices=TYPE_CHOICES, max_length=255)
    amount = models.FloatField(null=True, blank=True)
    amount_usd = models.FloatField(null=True, blank=True)
    price = models.FloatField(null=True, blank=True)
    stop_loss = models.FloatField(null=True, blank=True)
    trailing_stop_loss = models.FloatField(null=True, blank=True)
    take_profit = models.FloatField(null=True, blank=True)
    status = models.CharField(max_length=255, null=True, blank=True)
    direction = models.CharField(choices=DIRECTION_CHOICES, max_length=255)

    # To populate from the trade
    order_id = models.CharField(max_length=255, null=True, blank=True)
    client_order_id = models.CharField(max_length=255, null=True, blank=True)
    response = models.JSONField(null=True, blank=True)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._original = self

    def post(self):
        return self.account.client.post_trade(self)

    def delete(self, *args, **kwargs):
        # close the trade
        super().delete(*args, **kwargs)


class Callback(models.Model):
    hook = models.ForeignKey(Hook, on_delete=models.CASCADE)
    title = models.CharField(max_length=1024, null=True, blank=True)
    message = models.CharField(max_length=1024, null=True, blank=True)
    period = models.CharField(max_length=255, null=True, blank=True)
    sent = models.BigIntegerField(null=True, blank=True)
    trade = models.BigIntegerField(null=True, blank=True)
    exchange = models.CharField(max_length=255, null=True, blank=True)
    base = models.CharField(max_length=255, null=True, blank=True)
    quote = models.CharField(max_length=255, null=True, blank=True)
    contract = models.CharField(max_length=255, null=True, blank=True)
    price = models.FloatField(null=True, blank=True)
    symbol = models.CharField(max_length=255)


class Strategy(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    name = models.CharField(max_length=255)
    description = models.TextField(null=True, blank=True)
    account = models.ForeignKey(Account, on_delete=models.CASCADE)
    order_type = models.CharField(
        choices=TYPE_CHOICES, max_length=255, default="market"
    )
    time_in_force = models.CharField(choices=TIF_CHOICES, max_length=255, default="gtc")
    hooks = models.ManyToManyField(Hook)
    enabled = models.BooleanField(default=False)
    take_profit_percent = models.FloatField(default=1.5)
    stop_loss_percent = models.FloatField(default=1.0)
    trailing_stop_loss_percent = models.FloatField(default=1.0, null=True, blank=True)
    price_slippage_percent = models.FloatField(default=2.5)
    callback_price_deviation_percent = models.FloatField(default=0.5)
    trade_size_percent = models.FloatField(default=0.5)

    class Meta:
        verbose_name_plural = "strategies"

    def __str__(self):
        return self.name


# class Perms(models.Model):
#     class Meta:
#         permissions = (
#             ("bypass_hashing", "Can bypass field hashing"),  #
#             ("bypass_blacklist", "Can bypass the blacklist"),  #
#             ("bypass_encryption", "Can bypass field encryption"),  #
#             ("bypass_obfuscation", "Can bypass field obfuscation"),  #
#             ("bypass_delay", "Can bypass data delay"),  #
#             ("bypass_randomisation", "Can bypass data randomisation"),  #
#             ("post_irc", "Can post to IRC"),
#             ("post_discord", "Can post to Discord"),
#             ("query_search", "Can search with query strings"),  #
#             ("use_insights", "Can use the Insights page"),
#             ("index_int", "Can use the internal index"),
#             ("index_meta", "Can use the meta index"),
#             ("restricted_sources", "Can access restricted sources"),
#         )