import os

from django.db import models
from django.urls import NoReverseMatch
from django.urls import reverse
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from markdownx.models import MarkdownxField
from members.models import Group
from members.models import Member
from utils import RestrictedFileField


class Section(models.Model):
    """
    A section of the website.
    """

    title = models.CharField(verbose_name=_("Title"), max_length=50)
    urlname = models.CharField(verbose_name=_("URL"), max_length=25)
    website_text = MarkdownxField(verbose_name=_("website text"), default="", blank=True)
    show_in_navigation = models.BooleanField(verbose_name=_("Show in navigation"), default=True)

    class Meta:
        verbose_name = _("Section")
        verbose_name_plural = _("Sections")
        unique_together = ["urlname"]

    def __str__(self):
        return self.title

    def absolute_urlname(self):
        try:
            return reverse("startpage:section", args=(self.urlname,))
        except NoReverseMatch:
            return _("deactivated")

    absolute_urlname.short_description = "URL"


class Post(models.Model):
    """
    A post with title, markdown and images.
    """

    title = models.CharField(verbose_name=_("Title"), default="", max_length=50)
    urlname = models.CharField(verbose_name=_("URL"), default="", max_length=50)
    date = models.DateField(
        default=timezone.localdate, verbose_name=_("Date"), null=True, blank=True
    )
    website_text = MarkdownxField(verbose_name=_("website text"), default="", blank=True)

    groups = models.ManyToManyField(Group, verbose_name=_("Groups"), blank=True)
    detailed = models.BooleanField(verbose_name=_("detailed"), default=False)

    section = models.ForeignKey(
        Section, verbose_name=_("section"), on_delete=models.CASCADE, null=True, blank=False
    )

    def __str__(self):
        """String represenation"""
        return self.title

    class Meta:
        verbose_name = _("Post")
        verbose_name_plural = _("Posts")
        unique_together = ["section", "urlname"]

    def absolute_section(self):
        if self.section is None:
            return "Aktuelles"
        else:
            return self.section.title

    absolute_section.short_description = _("Section")

    def absolute_urlname(self):
        try:
            if self.section is None:
                return reverse("startpage:post", args=("aktuelles", self.urlname))
            else:
                return reverse("startpage:post", args=(self.section.urlname, self.urlname))
        except NoReverseMatch:
            return _("deactivated")

    absolute_urlname.short_description = "URL"


class Image(models.Model):
    """
    An image on a post.
    """

    post = models.ForeignKey(Post, on_delete=models.CASCADE)
    # file (not naming it file because of builtin)
    f = RestrictedFileField(_("file"), upload_to="images", blank=True, max_upload_size=10)

    def __str__(self):
        return os.path.basename(self.f.name) if self.f.name else str(_("Empty"))

    class Meta:
        verbose_name = _("image")
        verbose_name_plural = _("images")


class MemberOnPost(models.Model):
    """
    One or multiple members on a post.
    """

    members = models.ManyToManyField(Member, verbose_name=_("Member"), blank=True)
    post = models.ForeignKey(
        Post, verbose_name=_("Member"), on_delete=models.CASCADE, related_name="people"
    )
    description = models.TextField(_("Description"), default="", blank=True)
    tag = models.CharField(_("Tag"), max_length=20, default="", blank=True)

    class Meta:
        verbose_name = _("Person")
        verbose_name_plural = _("Persons")


class Link(models.Model):
    """
    Link to external resources that should be shown on the internal startpage.
    """

    title = models.CharField(_("Title"), max_length=100, default="", blank=True)
    description = models.TextField(_("Description"), default="", blank=True)
    url = models.URLField(max_length=250)

    icon = RestrictedFileField(
        verbose_name=_("Link Icon"),
        upload_to="icons",
        blank=True,
        max_upload_size=5,
        content_types=["image/jpeg", "image/png", "image/gif"],
    )

    visible = models.BooleanField(verbose_name=_("Visible"), default=True)

    class Meta:
        verbose_name = _("Link")
        verbose_name_plural = _("Links")

    def __str__(self):
        return self.title