import logging

import stripe
from django.conf import settings
from django.contrib.auth.models import AbstractUser
from django.db import models
from yaml import load
from yaml.parser import ParserError
from yaml.scanner import ScannerError

from core.lib.customers import get_or_create, update_customer_fields

try:
    from yaml import CLoader as Loader
except ImportError:
    from yaml import Loader
logger = logging.getLogger(__name__)

PRIORITY_CHOICES = (
    (1, "min"),
    (2, "low"),
    (3, "default"),
    (4, "high"),
    (5, "max"),
)

INTERVAL_CHOICES = (
    (0, "On demand"),
    (60, "Every minute"),
    (900, "Every 15 minutes"),
    (1800, "Every 30 minutes"),
    (3600, "Every hour"),
    (14400, "Every 4 hours"),
    (86400, "Every day"),
)


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 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 self.stripe_id:
            stripe.Customer.delete(self.stripe_id)
            logger.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

    def get_notification_settings(self):
        return NotificationSettings.objects.get_or_create(user=self)[0]

    @property
    def allowed_indices(self):
        indices = [settings.INDEX_MAIN]
        if self.has_perm("core.index_meta"):
            indices.append(settings.INDEX_META)
        if self.has_perm("core.index_internal"):
            indices.append(settings.INDEX_INT)
        if self.has_perm("core.index_restricted"):
            if self.has_perm("core.restricted_sources"):
                indices.append(settings.INDEX_RESTRICTED)

        return indices


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 ContentBlock(models.Model):
    user = models.ForeignKey(User, on_delete=models.PROTECT)
    position = models.IntegerField()
    page = models.CharField(max_length=255, null=True, blank=True)
    title = models.CharField(max_length=255, null=True, blank=True)
    column1 = models.TextField(null=True, blank=True)
    column2 = models.TextField(null=True, blank=True)
    column3 = models.TextField(null=True, blank=True)
    image1 = models.CharField(max_length=255, null=True, blank=True)
    image2 = models.CharField(max_length=255, null=True, blank=True)
    image3 = models.CharField(max_length=255, null=True, blank=True)

    def __str__(self):
        return f"[{self.position}] {self.page} {self.title}"

    def save(self, *args, **kwargs):
        """
        Override the save function to  blank fields.
        """
        if self.column1 == "":
            self.column1 = None
        if self.column2 == "":
            self.column2 = None
        if self.column3 == "":
            self.column3 = None
        if self.image1 == "":
            self.image1 = None
        if self.image2 == "":
            self.image2 = None
        if self.image3 == "":
            self.image3 = None

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


class Perms(models.Model):
    class Meta:
        permissions = (
            ("post_irc", "Can post to IRC"),
            ("post_discord", "Can post to Discord"),
            ("use_insights", "Can use the Insights page"),
            ("use_rules", "Can use the Rules page"),
            ("index_internal", "Can use the internal index"),
            ("index_meta", "Can use the meta index"),
            ("index_restricted", "Can use the restricted index"),
            ("restricted_sources", "Can access restricted sources"),
        )


class NotificationRule(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    name = models.CharField(max_length=255)
    priority = models.IntegerField(choices=PRIORITY_CHOICES, default=1)
    topic = models.CharField(max_length=255, null=True, blank=True)
    interval = models.IntegerField(choices=INTERVAL_CHOICES, default=0)
    window = models.CharField(max_length=255, null=True, blank=True)
    enabled = models.BooleanField(default=True)
    data = models.TextField()

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

    def parse(self):
        try:
            parsed = load(self.data, Loader=Loader)
        except (ScannerError, ParserError) as e:
            raise ValueError(f"Invalid YAML: {e}")
        return parsed


class NotificationSettings(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    ntfy_topic = models.CharField(max_length=255, null=True, blank=True)
    ntfy_url = models.CharField(max_length=255, null=True, blank=True)

    def __str__(self):
        return f"Notification settings for {self.user}"