"""saml sp models"""
from typing import Type

from django.db import models
from django.forms import ModelForm
from django.http import HttpRequest
from django.shortcuts import reverse
from django.urls import reverse_lazy
from django.utils.translation import gettext_lazy as _

from passbook.core.models import Source
from passbook.core.types import UILoginButton
from passbook.crypto.models import CertificateKeyPair
from passbook.lib.utils.time import timedelta_string_validator
from passbook.sources.saml.processors.constants import (
    SAML_NAME_ID_FORMAT_EMAIL,
    SAML_NAME_ID_FORMAT_PERSISTENT,
    SAML_NAME_ID_FORMAT_TRANSIENT,
    SAML_NAME_ID_FORMAT_WINDOWS,
    SAML_NAME_ID_FORMAT_X509,
)


class SAMLBindingTypes(models.TextChoices):
    """SAML Binding types"""

    Redirect = "REDIRECT", _("Redirect Binding")
    POST = "POST", _("POST Binding")
    POST_AUTO = "POST_AUTO", _("POST Binding with auto-confirmation")


class SAMLNameIDPolicy(models.TextChoices):
    """SAML NameID Policies"""

    EMAIL = SAML_NAME_ID_FORMAT_EMAIL
    PERSISTENT = SAML_NAME_ID_FORMAT_PERSISTENT
    X509 = SAML_NAME_ID_FORMAT_X509
    WINDOWS = SAML_NAME_ID_FORMAT_WINDOWS
    TRANSIENT = SAML_NAME_ID_FORMAT_TRANSIENT


class SAMLSource(Source):
    """Authenticate using an external SAML Identity Provider."""

    issuer = models.TextField(
        blank=True,
        default=None,
        verbose_name=_("Issuer"),
        help_text=_("Also known as Entity ID. Defaults the Metadata URL."),
    )

    sso_url = models.URLField(
        verbose_name=_("SSO URL"),
        help_text=_("URL that the initial Login request is sent to."),
    )
    slo_url = models.URLField(
        default=None,
        blank=True,
        null=True,
        verbose_name=_("SLO URL"),
        help_text=_("Optional URL if your IDP supports Single-Logout."),
    )

    allow_idp_initiated = models.BooleanField(
        default=False,
        help_text=_(
            "Allows authentication flows initiated by the IdP. This can be a security risk, "
            "as no validation of the request ID is done."
        ),
    )
    name_id_policy = models.TextField(
        choices=SAMLNameIDPolicy.choices,
        default=SAMLNameIDPolicy.TRANSIENT,
        help_text=_(
            "NameID Policy sent to the IdP. Can be unset, in which case no Policy is sent."
        ),
    )
    binding_type = models.CharField(
        max_length=100,
        choices=SAMLBindingTypes.choices,
        default=SAMLBindingTypes.Redirect,
    )

    temporary_user_delete_after = models.TextField(
        default="days=1",
        verbose_name=_("Delete temporary users after"),
        validators=[timedelta_string_validator],
        help_text=_(
            (
                "Time offset when temporary users should be deleted. This only applies if your IDP "
                "uses the NameID Format 'transient', and the user doesn't log out manually. "
                "(Format: hours=1;minutes=2;seconds=3)."
            )
        ),
    )

    signing_kp = models.ForeignKey(
        CertificateKeyPair,
        verbose_name=_("Singing Keypair"),
        help_text=_(
            "Certificate Key Pair of the IdP which Assertion's Signature is validated against."
        ),
        on_delete=models.PROTECT,
    )

    @property
    def form(self) -> Type[ModelForm]:
        from passbook.sources.saml.forms import SAMLSourceForm

        return SAMLSourceForm

    def get_issuer(self, request: HttpRequest) -> str:
        """Get Source's Issuer, falling back to our Metadata URL if none is set"""
        if self.issuer is None:
            return self.build_full_url(request, view="metadata")
        return self.issuer

    def build_full_url(self, request: HttpRequest, view: str = "acs") -> str:
        """Build Full ACS URL to be used in IDP"""
        return request.build_absolute_uri(
            reverse(f"passbook_sources_saml:{view}", kwargs={"source_slug": self.slug})
        )

    @property
    def ui_login_button(self) -> UILoginButton:
        return UILoginButton(
            name=self.name,
            url=reverse_lazy(
                "passbook_sources_saml:login", kwargs={"source_slug": self.slug}
            ),
            icon_path="",
        )

    @property
    def ui_additional_info(self) -> str:
        metadata_url = reverse_lazy(
            "passbook_sources_saml:metadata", kwargs={"source_slug": self.slug}
        )
        return f'<a href="{metadata_url}" class="btn btn-default btn-sm">Metadata Download</a>'

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

    class Meta:

        verbose_name = _("SAML Source")
        verbose_name_plural = _("SAML Sources")