import functools
import re

from django.conf import settings
from django.contrib.auth.models import Group
from django.contrib.postgres.search import SearchQuery, SearchRank, SearchVector
from django.db import models
from django.urls import reverse
from django.utils import timezone
from django.utils.translation import gettext_lazy as _

from filer.fields.image import FilerImageField
from taggit.managers import TaggableManager
from taggit.models import TaggedItemBase

from froide.foirequest.models import FoiRequest
from froide.follow.models import Follower
from froide.organization.models import Organization
from froide.publicbody.models import Category, Jurisdiction, PublicBody

try:
    from cms.models.fields import PlaceholderField
    from cms.models.pluginmodel import CMSPlugin
except ImportError:
    CMSPlugin = None
    PlaceholderField = None


class PlanStatus(models.TextChoices):
    NOT_STARTED = ("not_started", _("not started"))
    STARTED = ("started", _("started"))
    PARTIALLY_IMPLEMENTED = ("partially_implemented", _("partially implemented"))
    IMPLEMENTED = ("implemented", _("implemented"))
    DEFERRED = ("deferred", _("deferred"))


STATUS_CSS = {
    PlanStatus.NOT_STARTED: "light",
    PlanStatus.STARTED: "primary",
    PlanStatus.PARTIALLY_IMPLEMENTED: "warning",
    PlanStatus.IMPLEMENTED: "success",
    PlanStatus.DEFERRED: "danger",
}


class PlanRating(models.IntegerChoices):
    TERRIBLE = 1, _("terrible")
    BAD = 2, _("bad")
    OK = 3, _("OK")
    GOOD = 4, _("good")
    EXCELLENT = 5, _("excellent")


class Government(models.Model):
    name = models.CharField(max_length=255, verbose_name=_("name"))
    slug = models.SlugField(max_length=255, unique=True, verbose_name=_("slug"))

    public = models.BooleanField(default=False, verbose_name=_("is public?"))
    jurisdiction = models.ForeignKey(
        Jurisdiction,
        null=True,
        on_delete=models.SET_NULL,
        verbose_name=_("jurisdiction"),
    )
    description = models.TextField(blank=True, verbose_name=_("description"))

    start_date = models.DateField(null=True, blank=True, verbose_name=_("start date"))
    end_date = models.DateField(null=True, blank=True, verbose_name=_("end date"))

    planning_document = models.URLField(blank=True, verbose_name=_("planning document"))

    class Meta:
        verbose_name = _("Government")
        verbose_name_plural = _("Governments")

    def __str__(self):
        return self.name


class CategorizedGovernmentPlan(TaggedItemBase):
    tag = models.ForeignKey(
        Category, on_delete=models.CASCADE, related_name="categorized_governmentplan"
    )
    content_object = models.ForeignKey("GovernmentPlan", on_delete=models.CASCADE)

    class Meta:
        verbose_name = _("Categorized Government Plan")
        verbose_name_plural = _("Categorized Government Plans")


WORD_RE = re.compile(r"^\w+$", re.IGNORECASE)


class GovernmentPlanManager(models.Manager):
    SEARCH_LANG = "german"

    def get_search_vector(self):
        fields = [
            ("title", "A"),
            ("description", "B"),
            ("quote", "B"),
        ]
        return functools.reduce(
            lambda a, b: a + b,
            [SearchVector(f, weight=w, config=self.SEARCH_LANG) for f, w in fields],
        )

    def search(self, query, qs=None):
        if not qs:
            qs = self.get_queryset()
        if not query:
            return qs
        search_queries = []
        for q in query.split():
            if WORD_RE.match(q):
                sq = SearchQuery(
                    "{}:*".format(q), search_type="raw", config=self.SEARCH_LANG
                )
            else:
                sq = SearchQuery(q, search_type="plain", config=self.SEARCH_LANG)
            search_queries.append(sq)

        search_query = functools.reduce(lambda a, b: a & b, search_queries)
        search_vector = self.get_search_vector()
        qs = (
            qs.annotate(rank=SearchRank(search_vector, search_query))
            .filter(rank__gte=0.3)
            .order_by("-rank")
        )
        return qs


class GovernmentPlan(models.Model):
    government = models.ForeignKey(
        Government, on_delete=models.CASCADE, verbose_name=_("government")
    )
    title = models.CharField(max_length=255, verbose_name=_("title"))
    slug = models.SlugField(max_length=255, unique=True, verbose_name=_("slug"))

    image = FilerImageField(
        null=True,
        blank=True,
        default=None,
        verbose_name=_("image"),
        on_delete=models.SET_NULL,
    )

    description = models.TextField(blank=True, verbose_name=_("description"))
    quote = models.TextField(blank=True, verbose_name=_("quote"))
    public = models.BooleanField(default=False, verbose_name=_("is public?"))
    due_date = models.DateField(null=True, blank=True, verbose_name=_("due date"))
    measure = models.CharField(max_length=255, blank=True, verbose_name=_("measure"))

    status = models.CharField(
        max_length=25,
        choices=PlanStatus.choices,
        default="not_started",
        verbose_name=_("status"),
    )
    rating = models.IntegerField(
        choices=PlanRating.choices, null=True, blank=True, verbose_name=_("rating")
    )

    reference = models.CharField(
        max_length=255, blank=True, verbose_name=_("reference")
    )

    categories = TaggableManager(
        through=CategorizedGovernmentPlan, verbose_name=_("categories"), blank=True
    )
    responsible_publicbody = models.ForeignKey(
        PublicBody,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name=_("responsible public body"),
    )

    organization = models.ForeignKey(
        Organization,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name=_("organization"),
    )

    group = models.ForeignKey(
        Group, null=True, blank=True, on_delete=models.SET_NULL, verbose_name=_("group")
    )

    objects = GovernmentPlanManager()

    class Meta:
        ordering = ("reference", "title")
        verbose_name = _("Government plan")
        verbose_name_plural = _("Government plans")

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse(
            "govplan:plan", kwargs={"gov": self.government.slug, "plan": self.slug}
        )

    def get_absolute_domain_url(self):
        return settings.SITE_URL + self.get_absolute_url()

    def get_reference_links(self):
        if self.reference.startswith("https://"):
            return [self.reference]
        refs = [x.strip() for x in self.reference.split(",")]
        return [
            "{}#p-{}".format(self.government.planning_document, ref) for ref in refs
        ]

    def update_from_updates(self):
        last_status_update = (
            self.updates.all().filter(public=True).exclude(status="").first()
        )
        if last_status_update:
            self.status = last_status_update.status
        last_rating_update = (
            self.updates.all().filter(public=True).exclude(rating=None).first()
        )
        if last_rating_update:
            self.rating = last_rating_update.rating
        if last_status_update or last_rating_update:
            self.save()

    def get_status_css(self):
        return STATUS_CSS.get(self.status, "")


class GovernmentPlanUpdate(models.Model):
    plan = models.ForeignKey(
        GovernmentPlan,
        on_delete=models.CASCADE,
        related_name="updates",
        verbose_name=_("plan"),
    )
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name=_("user"),
    )
    organization = models.ForeignKey(
        Organization,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name=_("organization"),
    )
    timestamp = models.DateTimeField(default=timezone.now, verbose_name=_("timestamp"))
    title = models.CharField(max_length=1024, blank=True, verbose_name=_("title"))
    content = models.TextField(blank=True, verbose_name=_("content"))
    url = models.URLField(blank=True, max_length=1024, verbose_name=_("URL"))

    status = models.CharField(
        max_length=25,
        choices=PlanStatus.choices,
        default="",
        blank=True,
        verbose_name=_("status"),
    )
    rating = models.IntegerField(
        choices=PlanRating.choices, null=True, blank=True, verbose_name=_("rating")
    )
    public = models.BooleanField(default=False, verbose_name=_("is public?"))

    foirequest = models.ForeignKey(
        FoiRequest,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        verbose_name=_("FOI request"),
    )

    class Meta:
        ordering = ("-timestamp",)
        get_latest_by = "timestamp"
        verbose_name = _("Plan update")
        verbose_name_plural = _("Plan updates")

    def __str__(self):
        return "{} - {} ({})".format(self.title, self.timestamp, self.plan)


class GovernmentPlanFollower(Follower):
    content_object = models.ForeignKey(
        GovernmentPlan,
        on_delete=models.CASCADE,
        related_name="followers",
        verbose_name=_("Government plan"),
    )

    class Meta(Follower.Meta):
        verbose_name = _("Government plan follower")
        verbose_name_plural = _("Government plan followers")


class GovernmentPlanSection(models.Model):
    government = models.ForeignKey(
        Government, on_delete=models.CASCADE, verbose_name=_("government")
    )

    title = models.CharField(max_length=255, verbose_name=_("title"))
    slug = models.SlugField(max_length=255, unique=True, verbose_name=_("slug"))

    categories = models.ManyToManyField(Category, blank=True)

    description = models.TextField(blank=True, verbose_name=_("description"))
    image = FilerImageField(
        null=True,
        blank=True,
        default=None,
        verbose_name=_("image"),
        on_delete=models.SET_NULL,
    )

    icon = models.CharField(
        _("Icon"),
        max_length=50,
        blank=True,
        help_text=_(
            """Enter an icon name from the <a href="https://fontawesome.com/v4.7.0/icons/" target="_blank">FontAwesome 4 icon set</a>"""
        ),
    )
    order = models.PositiveIntegerField(default=0)
    featured = models.DateTimeField(null=True, blank=True)

    if PlaceholderField:
        content_placeholder = PlaceholderField("content")

    class Meta:
        verbose_name = _("Government plan section")
        verbose_name_plural = _("Government plan sections")
        ordering = (
            "order",
            "title",
        )

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse(
            "govplan:section",
            kwargs={"gov": self.government.slug, "section": self.slug},
        )

    def get_absolute_domain_url(self):
        return settings.SITE_URL + self.get_absolute_url()

    def get_plans(self):
        return (
            GovernmentPlan.objects.filter(
                categories__in=self.categories.all(), government=self.government
            )
            .distinct()
            .order_by("title")
        )


if CMSPlugin:

    PLUGIN_TEMPLATES = [
        ("froide_govplan/plugins/default.html", _("Normal")),
        ("froide_govplan/plugins/progress.html", _("Progress")),
        ("froide_govplan/plugins/card_cols.html", _("Card columns")),
        ("froide_govplan/plugins/search.html", _("Search")),
    ]

    class GovernmentPlansCMSPlugin(CMSPlugin):
        """
        CMS Plugin for displaying latest articles
        """

        government = models.ForeignKey(
            Government, null=True, blank=True, on_delete=models.SET_NULL
        )
        categories = models.ManyToManyField(
            Category, verbose_name=_("categories"), blank=True
        )

        count = models.PositiveIntegerField(
            _("number of plans"), default=1, help_text=_("0 means all the plans")
        )
        offset = models.PositiveIntegerField(
            _("offset"),
            default=0,
            help_text=_("number of plans to skip from top of list"),
        )
        template = models.CharField(
            _("template"),
            blank=True,
            max_length=250,
            choices=PLUGIN_TEMPLATES,
            help_text=_("template used to display the plugin"),
        )

        @property
        def render_template(self):
            """
            Override render_template to use
            the template_to_render attribute
            """
            return self.template_to_render

        def copy_relations(self, old_instance):
            """
            Duplicate ManyToMany relations on plugin copy
            """
            self.categories.set(old_instance.categories.all())

        def __str__(self):
            if self.count == 0:
                return str(_("All matching plans"))
            return _("%s matching plans") % self.count

        def get_plans(self, request, published_only=True):
            if (
                published_only
                or not request
                or not getattr(request, "toolbar", False)
                or not request.toolbar.edit_mode_active
            ):
                plans = GovernmentPlan.objects.filter(public=True)
            else:
                plans = GovernmentPlan.objects.all()

            filters = {}
            if self.government:
                filters["government"] = self.government

            cat_list = self.categories.all().values_list("id", flat=True)
            if cat_list:
                filters["categories__in"] = cat_list

            plans = plans.filter(**filters).distinct()
            plans = plans.prefetch_related("categories", "government", "organization")
            if self.count == 0:
                return plans[self.offset :]
            return plans[self.offset : self.offset + self.count]

    class GovernmentPlanSectionsCMSPlugin(CMSPlugin):
        """
        CMS Plugin for displaying plan sections
        """

        government = models.ForeignKey(
            Government, null=True, blank=True, on_delete=models.SET_NULL
        )