from collections import defaultdict

from django.core import signing
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _
from django.views.generic.dates import timezone_today
from django_hosts import reverse
from sorl.thumbnail import ImageField

from djangoproject.thumbnails import LogoThumbnailMixin

BRONZE_MEMBERSHIP = 1
SILVER_MEMBERSHIP = 2
GOLD_MEMBERSHIP = 3
PLATINUM_MEMBERSHIP = 4
DIAMOND_MEMBERSHIP = 5

CORPORATE_MEMBERSHIP_AMOUNTS = {
    "diamond": 100000,
    "platinum": 30000,
    "gold": 12500,
    "silver": 5000,
    "bronze": 2000,
}

MEMBERSHIP_LEVELS = (
    (BRONZE_MEMBERSHIP, _("Bronze")),
    (SILVER_MEMBERSHIP, _("Silver")),
    (GOLD_MEMBERSHIP, _("Gold")),
    (PLATINUM_MEMBERSHIP, _("Platinum")),
    (DIAMOND_MEMBERSHIP, _("Diamond")),
)

MEMBERSHIP_TO_KEY = {k: v.lower() for k, v in MEMBERSHIP_LEVELS}


class IndividualMember(models.Model):
    name = models.CharField(max_length=250)
    email = models.EmailField(unique=True)
    member_since = models.DateField(default=timezone_today)
    member_until = models.DateField(null=True, blank=True)
    reason_for_leaving = models.TextField(
        blank=True,
        help_text=mark_safe(
            _(
                "⚠️ This reason is publicly displayed on the website. "
                "<strong>Do not include confidential details.</strong>"
            )
        ),
    )

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name

    @property
    def is_active(self):
        return self.member_until is None


class Team(models.Model):
    name = models.CharField(max_length=250)
    slug = models.SlugField()
    description = models.TextField(help_text=_("HTML, without surrounding <p> tags."))
    members = models.ManyToManyField(IndividualMember)

    def __str__(self):
        return self.name


class CorporateMemberManager(models.Manager):
    def for_public_display(self):
        objs = (
            self.get_queryset()
            .filter(
                invoice__expiration_date__gte=timezone_today(),
            )
            .annotate(donated_amount=models.Sum("invoice__amount"))
        )
        return objs.order_by("-donated_amount", "display_name")

    def by_membership_level(self):
        members_by_type = defaultdict(list)
        members = self.for_public_display()
        for member in members:
            key = MEMBERSHIP_TO_KEY[member.membership_level]
            members_by_type[key].append(member)
        return members_by_type


class CorporateMember(LogoThumbnailMixin, models.Model):
    display_name = models.CharField(max_length=250)
    billing_name = models.CharField(
        max_length=250,
        blank=True,
        help_text=_("If different from display name."),
    )
    logo = ImageField(upload_to="corporate-members", null=True, blank=True)
    description = models.TextField(blank=True)
    url = models.URLField(verbose_name="URL")
    contact_name = models.CharField(max_length=250)
    contact_email = models.EmailField()
    billing_email = models.EmailField(
        blank=True,
        help_text=_("If different from contact email."),
    )
    membership_level = models.IntegerField(choices=MEMBERSHIP_LEVELS)
    address = models.TextField(blank=True)
    django_usage = models.TextField(blank=True, help_text=_("Not displayed publicly."))
    notes = models.TextField(blank=True, help_text=_("Not displayed publicly."))
    inactive = models.BooleanField(default=False, help_text=_("No longer renewing."))

    objects = CorporateMemberManager()

    class Meta:
        ordering = ["display_name"]

    def __str__(self):
        return self.display_name

    def _is_invoiced(self):
        invoices = self.invoice_set.all()
        return bool(invoices) and all(
            invoice.sent_date is not None for invoice in invoices
        )

    _is_invoiced.boolean = True
    is_invoiced = property(_is_invoiced)

    def _is_paid(self):
        invoices = self.invoice_set.all()
        return bool(invoices) and all(
            invoice.paid_date is not None for invoice in invoices
        )

    _is_paid.boolean = True
    is_paid = property(_is_paid)

    def get_expiry_date(self):
        expiry_date = None
        for invoice in self.invoice_set.all():
            if expiry_date is None:
                expiry_date = invoice.expiration_date
            elif invoice.expiration_date and invoice.expiration_date > expiry_date:
                expiry_date = invoice.expiration_date
        return expiry_date

    def get_renewal_link(self):
        return reverse(
            "members:corporate-members-renew", kwargs={"token": signing.dumps(self.pk)}
        )


@receiver(post_save, sender=CorporateMember)
def create_thumbnail_on_save(sender, **kwargs):
    return kwargs["instance"].thumbnail


class Invoice(models.Model):
    sent_date = models.DateField(blank=True, null=True)
    amount = models.IntegerField(help_text=_("In integer dollars"))
    paid_date = models.DateField(blank=True, null=True)
    expiration_date = models.DateField(blank=True, null=True)
    member = models.ForeignKey(CorporateMember, on_delete=models.CASCADE)