from itertools import chain

from django.contrib.auth import get_user_model
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType
from django.test import Client

from hypothesis import given
from hypothesis import strategies as st
from hypothesis.extra.django import TestCase, from_model

from paperwork.models import (
    Certification,
    CertificationDefinition,
    CertificationVersion,
    Department,
    InstructorOrVendor,
    Waiver,
)


class PermissionRequiredViewTestCaseMixin:
    permissions = []
    path = None

    @classmethod
    def setUpTestData(cls):
        User = get_user_model()
        cls.client = Client()

        cls.user_without_permission = User.objects.create_user(
            username="user_without_permission"
        )
        cls.user_with_permission = User.objects.create_user(
            username="user_with_permission"
        )

        resolved_permissions = [
            Permission.objects.get(
                content_type=ContentType.objects.get_for_model(permission["model"]),
                codename=permission["codename"],
            )
            for permission in cls.permissions
        ]

        cls.user_with_permission.user_permissions.add(*resolved_permissions)

    def test_missing_permission(self) -> None:
        self.client.force_login(self.user_without_permission)
        response = self.client.get(self.path)
        self.assertEqual(response.status_code, 403)


class WaiverReportTestCase(PermissionRequiredViewTestCaseMixin, TestCase):
    permissions = [{"model": Waiver, "codename": "view_waiver"}]
    path = "/paperwork/waivers"

    @given(waivers=st.lists(from_model(Waiver, number=st.none())))
    def test_waiver_report(self, waivers: list[Waiver]) -> None:
        self.client.force_login(self.user_with_permission)
        response = self.client.get(self.path)
        self.assertEqual(response.status_code, 200)


class InstructorOrVendorReportTestCase(PermissionRequiredViewTestCaseMixin, TestCase):
    permissions = [{"model": InstructorOrVendor, "codename": "view_instructororvendor"}]
    path = "/paperwork/instructors-and-vendors"

    @given(
        instructors_or_vendors=st.lists(
            from_model(InstructorOrVendor, serial=st.none())
        )
    )
    def test_waiver_report(
        self, instructors_or_vendors: list[InstructorOrVendor]
    ) -> None:
        self.client.force_login(self.user_with_permission)
        response = self.client.get(self.path)
        self.assertEqual(response.status_code, 200)


@st.composite
def random_certifications(
    draw,
) -> list[Certification]:
    def certifications(version: CertificationVersion):
        return st.lists(
            from_model(
                Certification,
                number=st.none(),
                certification_version=st.just(version),
            ),
            max_size=10,
        )

    def versions_with_certifications(definition: CertificationDefinition):
        return st.lists(
            from_model(CertificationVersion, definition=st.just(definition)).flatmap(
                certifications
            ),
            max_size=2,
        )

    def definitions_with_versions(department: Department):
        return st.lists(
            from_model(CertificationDefinition, department=st.just(department)).flatmap(
                versions_with_certifications
            ),
            max_size=2,
        )

    return draw(
        st.lists(
            from_model(Department).flatmap(definitions_with_versions),
            max_size=2,
        ).map(
            lambda x: list(
                chain.from_iterable(chain.from_iterable(chain.from_iterable(x)))
            )
        )
    )


class CertifiersReportTestCase(PermissionRequiredViewTestCaseMixin, TestCase):
    permissions = [{"model": Certification, "codename": "view_certification"}]
    path = "/paperwork/certifiers"

    @given(certifications=random_certifications())
    def test_certifiers_report(self, certifications: list[Certification]) -> None:
        self.client.force_login(self.user_with_permission)
        response = self.client.get(self.path)
        self.assertEqual(response.status_code, 200)


class CertificationCountReportTestCase(PermissionRequiredViewTestCaseMixin, TestCase):
    permissions = [{"model": Certification, "codename": "view_certification"}]
    path = "/paperwork/certification-count"

    @given(certifications=random_certifications())
    def test_certification_count_report(
        self, certifications: list[Certification]
    ) -> None:
        self.client.force_login(self.user_with_permission)
        response = self.client.get(self.path)
        self.assertEqual(response.status_code, 200)