from django.db import models
from django.core.exceptions import ValidationError
from django.urls import reverse
from django.utils.text import slugify
from django_prose_editor.fields import ProseEditorField


def validate_image_size(value):
    filesize = value.size
    if filesize > 1 * 1024 * 1024:  # 1MB
        raise ValidationError("Maximum file size is 1MB")


class Category(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField(unique=True)
    parent = models.ForeignKey(
        "self", on_delete=models.CASCADE, null=True, blank=True, related_name="children"
    )
    description = models.TextField(blank=True)
    order = models.IntegerField(default=0)

    class Meta:
        verbose_name_plural = "Categories"
        ordering = ["order", "name"]

    def __str__(self):
        if self.parent:
            return f"{self.parent} > {self.name}"
        return self.name

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)

    @property
    def full_path(self):
        path = [self.name]
        parent = self.parent
        while parent:
            path.append(parent.name)
            parent = parent.parent
        return " > ".join(reversed(path))


class CloudProvider(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField(unique=True)
    description = ProseEditorField()
    website = models.URLField()
    logo = models.ImageField(
        upload_to="cloud_provider_logos/",
        validators=[validate_image_size],
        null=True,
        blank=True,
    )
    is_featured = models.BooleanField(default=False)

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("services:provider_detail", kwargs={"slug": self.slug})


class Currency(models.Model):
    code = models.CharField(max_length=3, unique=True)  # ISO 4217 currency code
    name = models.CharField(max_length=50)
    symbol = models.CharField(max_length=5)

    class Meta:
        verbose_name_plural = "Currencies"
        ordering = ["code"]

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


class Term(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)
    order = models.IntegerField(default=0)

    class Meta:
        ordering = ["order", "name"]

    def __str__(self):
        return self.name


class Service(models.Model):
    name = models.CharField(max_length=200)
    slug = models.SlugField(max_length=250, unique=True)
    description = ProseEditorField()
    logo = models.ImageField(
        upload_to="service_logos/",
        validators=[validate_image_size],
        null=True,
        blank=True,
    )
    categories = models.ManyToManyField(Category, related_name="services")
    features = ProseEditorField()
    is_featured = models.BooleanField(default=False)
    is_coming_soon = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.name

    def clean(self):
        if self.is_featured and self.is_coming_soon:
            raise ValidationError(
                "A service cannot be both featured and coming soon simultaneously."
            )
        super().clean()

    def save(self, *args, **kwargs):
        self.clean()  # Ensure validation runs on save
        if not self.slug:
            self.slug = slugify(self.name)
            counter = 1
            while Service.objects.filter(slug=self.slug).exists():
                self.slug = f"{slugify(self.name)}-{counter}"
                counter += 1
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("services:service_detail", kwargs={"slug": self.slug})


class ConsultingPartner(models.Model):
    name = models.CharField(max_length=200)
    slug = models.SlugField(unique=True)
    description = ProseEditorField()
    logo = models.ImageField(
        upload_to="partner_logos/",
        validators=[validate_image_size],
        null=True,
        blank=True,
    )
    website = models.URLField(blank=True)
    services = models.ManyToManyField(Service, related_name="consulting_partners")
    cloud_providers = models.ManyToManyField(
        CloudProvider, related_name="consulting_partners", blank=True
    )
    is_featured = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("services:partner_detail", kwargs={"slug": self.slug})


class ServiceOffering(models.Model):
    service = models.ForeignKey(
        Service, on_delete=models.CASCADE, related_name="offerings"
    )
    cloud_provider = models.ForeignKey(
        CloudProvider, on_delete=models.CASCADE, related_name="offerings"
    )
    slug = models.SlugField(max_length=250, unique=True)
    description = ProseEditorField(help_text="Provider-specific details and features")
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    STATUS_CHOICES = [
        ("available", "Available"),
        ("planned", "Planned"),
        ("on_request", "On Request"),
    ]
    status = models.CharField(
        max_length=20, choices=STATUS_CHOICES, default="available"
    )

    class Meta:
        unique_together = ["service", "cloud_provider"]
        ordering = ["service__name", "cloud_provider__name"]

    def __str__(self):
        return f"{self.service.name} on {self.cloud_provider.name}"

    def save(self, *args, **kwargs):
        if not self.slug:
            base_slug = f"{self.service.name}-{self.cloud_provider.name}"
            self.slug = slugify(base_slug)
            counter = 1
            while ServiceOffering.objects.filter(slug=self.slug).exists():
                self.slug = f"{slugify(base_slug)}-{counter}"
                counter += 1
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse("services:offering_detail", kwargs={"slug": self.slug})


class Plan(models.Model):
    name = models.CharField(max_length=100)
    description = ProseEditorField()
    offering = models.ForeignKey(
        ServiceOffering, on_delete=models.CASCADE, related_name="plans"
    )
    is_default = models.BooleanField(default=False)
    features = ProseEditorField(blank=True)
    order = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["order", "name"]
        unique_together = [["offering", "name"]]

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

    def save(self, *args, **kwargs):
        if self.is_default:
            # Ensure only one default plan per offering
            Plan.objects.filter(offering=self.offering).update(is_default=False)
        super().save(*args, **kwargs)


class PlanPrice(models.Model):
    plan = models.ForeignKey(Plan, on_delete=models.CASCADE, related_name="prices")
    currency = models.ForeignKey(Currency, on_delete=models.PROTECT)
    term = models.ForeignKey(Term, on_delete=models.PROTECT)
    price = models.DecimalField(max_digits=10, decimal_places=2)

    class Meta:
        unique_together = [["plan", "currency", "term"]]

    def __str__(self):
        return f"{self.plan.name} - {self.currency.code} {self.price}"


class ExternalLink(models.Model):
    service = models.ForeignKey(
        Service, on_delete=models.CASCADE, related_name="external_links"
    )
    url = models.URLField()
    description = models.CharField(max_length=200)
    order = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["order", "description"]
        verbose_name = "External Link"
        verbose_name_plural = "External Links"

    def __str__(self):
        return f"{self.description} ({self.url})"

    def clean(self):
        from django.core.validators import URLValidator

        validate = URLValidator()
        try:
            validate(self.url)
        except ValidationError:
            raise ValidationError({"url": "Enter a valid URL."})


class Lead(models.Model):
    name = models.CharField(max_length=200)
    email = models.EmailField()
    company = models.CharField(max_length=200, null=True, blank=True)
    phone = models.CharField(max_length=50, null=True, blank=True)
    message = models.TextField(blank=True, null=True, max_length=1000)
    odoo_lead_id = models.IntegerField(null=True, blank=True)

    service = models.ForeignKey(
        Service, on_delete=models.SET_NULL, null=True, blank=True
    )
    offering = models.ForeignKey(
        ServiceOffering, on_delete=models.SET_NULL, null=True, blank=True
    )
    plan = models.ForeignKey(Plan, on_delete=models.SET_NULL, null=True, blank=True)

    created_at = models.DateTimeField(auto_now_add=True)

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