from django.core.validators import FileExtensionValidator, RegexValidator
from django.db import models


class SiteBranding(models.Model):
    hex_color_validator = RegexValidator(
        regex=r"^#[0-9A-Fa-f]{6}$",
        message="Enter a six-digit hex colour such as #4f8ef7.",
    )
    OBJECT_FIT_COVER = "cover"
    OBJECT_FIT_CONTAIN = "contain"
    OBJECT_FIT_CHOICES = [
        (OBJECT_FIT_COVER, "Cover (fill square, may crop)"),
        (OBJECT_FIT_CONTAIN, "Contain (fit inside square)"),
    ]

    site_name = models.CharField(max_length=120, default="Communication to Care")
    short_name = models.CharField(
        max_length=60,
        default="com2care",
        help_text="Compact name used in the navigation bar.",
    )
    tagline = models.CharField(
        max_length=300,
        default="Turning complex medical-imaging evidence into clearer, reproducible research conversations.",
        blank=True,
    )
    meta_description = models.CharField(
        max_length=300,
        default="Communication to Care — Advanced Medical Imaging and Radiomics Solutions",
        blank=True,
    )
    article_people_eyebrow = models.CharField(
        max_length=160,
        blank=True,
        default="The people behind this article",
        help_text="Small heading above the people cards on every blog article.",
    )
    article_people_title = models.CharField(
        max_length=200,
        default="Organizers & collaborators",
        help_text="Heading above the people cards on every blog article.",
    )

    icon = models.ImageField(
        upload_to="branding/",
        blank=True,
        null=True,
        verbose_name="Header and footer logo",
        help_text="Brand logo shown in the site navigation and footer. Leave empty to use the default logo.",
    )
    icon_alt = models.CharField(
        max_length=200,
        blank=True,
        help_text="Alt text for the brand icon (decorative icons can stay empty).",
    )
    website_icon = models.FileField(
        upload_to="branding/icons/",
        blank=True,
        null=True,
        validators=[
            FileExtensionValidator(
                allowed_extensions=("ico", "png", "svg", "jpg", "jpeg", "webp")
            )
        ],
        help_text=(
            "Icon shown in browser tabs and bookmarks. Use a square ICO, PNG, SVG, "
            "JPG, or WebP file. Leave empty to use the default Communication to Care icons."
        ),
    )
    hero_logo = models.ImageField(
        upload_to="branding/hero/",
        blank=True,
        null=True,
        help_text=(
            "Large brand artwork shown in the homepage hero. Leave empty to use "
            "the existing hero image."
        ),
    )
    hero_logo_alt = models.CharField(
        max_length=200,
        blank=True,
        default="Communication to Care",
        help_text="Accessible description for the homepage hero logo.",
    )
    navbar_icon_size = models.PositiveSmallIntegerField(
        default=26,
        help_text="Maximum height in pixels for the header logo. Width scales automatically.",
    )
    footer_icon_size = models.PositiveSmallIntegerField(
        default=34,
        help_text="Maximum height in pixels for the footer logo. Width scales automatically.",
    )
    show_border = models.BooleanField(
        default=False,
        help_text="Draw a border around the brand icon.",
    )
    border_color = models.CharField(
        max_length=7,
        default="#c4b5fd",
        help_text="Border color as hex (e.g. #c4b5fd).",
    )
    border_width = models.PositiveSmallIntegerField(
        default=1,
        help_text="Border width in pixels.",
    )
    object_fit = models.CharField(
        max_length=10,
        choices=OBJECT_FIT_CHOICES,
        default=OBJECT_FIT_COVER,
    )
    background_color = models.CharField(
        max_length=7, default="#070713", validators=[hex_color_validator]
    )
    surface_color = models.CharField(
        max_length=7, default="#10102a", validators=[hex_color_validator]
    )
    primary_color = models.CharField(
        max_length=7, default="#4f8ef7", validators=[hex_color_validator]
    )
    secondary_color = models.CharField(
        max_length=7, default="#a78bfa", validators=[hex_color_validator]
    )
    accent_color = models.CharField(
        max_length=7, default="#22d3ee", validators=[hex_color_validator]
    )
    text_color = models.CharField(
        max_length=7, default="#eef2ff", validators=[hex_color_validator]
    )
    muted_text_color = models.CharField(
        max_length=7, default="#a6abc2", validators=[hex_color_validator]
    )

    class Meta:
        verbose_name = "Site Branding"
        verbose_name_plural = "Site Branding"

    def __str__(self):
        return self.site_name

    @classmethod
    def load(cls):
        obj, _ = cls.objects.get_or_create(pk=1)
        return obj

    def icon_style(self, size_px):
        parts = [
            "width:auto",
            f"height:{size_px}px",
            "object-fit:contain",
        ]
        if self.show_border:
            parts.append(f"border:{self.border_width}px solid {self.border_color}")
        return ";".join(parts)

    @property
    def navbar_icon_style(self):
        return self.icon_style(self.navbar_icon_size)

    @property
    def footer_icon_style(self):
        return self.icon_style(self.footer_icon_size)

    @property
    def theme_style(self):
        return ";".join(
            (
                f"--bg-primary:{self.background_color}",
                f"--bg-secondary:{self.background_color}",
                f"--bg-surface:{self.surface_color}",
                f"--accent-blue:{self.primary_color}",
                f"--accent-blue-light:{self.primary_color}",
                f"--accent-purple:{self.secondary_color}",
                f"--accent-cyan:{self.accent_color}",
                f"--text-primary:{self.text_color}",
                f"--text-secondary:{self.muted_text_color}",
                f"--text-muted:{self.muted_text_color}",
                f"--text-link:{self.primary_color}",
                f"--gradient-brand:linear-gradient(135deg,{self.primary_color} 0%,{self.secondary_color} 100%)",
                f"--gradient-text:linear-gradient(135deg,{self.primary_color} 0%,{self.secondary_color} 50%,{self.accent_color} 100%)",
            )
        )


class SiteContact(models.Model):
    support_email = models.EmailField(
        blank=True,
        help_text="Shown in the footer and on the contact page. Hidden when empty.",
    )
    discord_url = models.URLField(
        blank=True,
        help_text="Discord invite link. Hidden when empty.",
    )
    discord_label = models.CharField(
        max_length=100,
        blank=True,
        help_text="Button label (e.g. Join Discord). Defaults to “Join Discord” when empty.",
    )
    office_address = models.TextField(
        blank=True,
        help_text="Physical address; one line per row. Hidden when empty.",
    )
    email_card_title = models.CharField(
        max_length=200,
        blank=True,
        help_text="Contact page email card heading. Defaults to “Email Support”.",
    )
    email_card_description = models.CharField(
        max_length=500,
        blank=True,
        help_text="Short text under the email card heading on the contact page.",
    )
    discord_card_title = models.CharField(
        max_length=200,
        blank=True,
        help_text="Contact page Discord card heading. Defaults to “Discord Community”.",
    )
    discord_card_description = models.CharField(
        max_length=500,
        blank=True,
        help_text="Short text under the Discord card heading on the contact page.",
    )
    office_card_title = models.CharField(
        max_length=200,
        blank=True,
        help_text="Contact page office card heading. Defaults to “Office”.",
    )

    class Meta:
        verbose_name = "Site Contact"
        verbose_name_plural = "Site Contact"

    def __str__(self):
        return "Site Contact"

    @classmethod
    def load(cls):
        obj, _ = cls.objects.get_or_create(pk=1)
        return obj

    @property
    def discord_label_display(self):
        return self.discord_label.strip() or "Join Discord"

    @property
    def office_address_lines(self):
        if not self.office_address.strip():
            return []
        return [line.strip() for line in self.office_address.splitlines() if line.strip()]

    @property
    def has_support_email(self):
        return bool(self.support_email)

    @property
    def has_discord(self):
        return bool(self.discord_url)

    @property
    def has_office_address(self):
        return bool(self.office_address_lines)

    @property
    def has_footer_contact(self):
        return self.has_support_email or self.has_office_address

    @property
    def has_contact_sidebar(self):
        return self.has_support_email or self.has_discord or self.has_office_address

    @property
    def email_card_title_display(self):
        return self.email_card_title.strip() or "Email Support"

    @property
    def discord_card_title_display(self):
        return self.discord_card_title.strip() or "Discord Community"

    @property
    def office_card_title_display(self):
        return self.office_card_title.strip() or "Office"