from datetime import timedelta

import pytest
from cryptography.fernet import Fernet
from django.contrib.auth import get_user_model
from django.test import Client, override_settings
from django.urls import reverse
from django.utils import timezone

from apps.sources.models import MailboxConnection
from apps.sources.services.mailbox_connections import (
    claim_mailbox_connection,
    decrypt_mailbox_password,
)
from apps.sources.tasks import poll_mailbox, schedule_mailbox_polls


def _payload(**overrides):
    payload = {
        "platform": MailboxConnection.Platform.VDAB,
        "provider": MailboxConnection.Provider.GMAIL,
        "custom_host": "",
        "port": 993,
        "username": "vdab-alerts@example.invalid",
        "password": "test-app-password",
        "mailbox": "INBOX",
        "poll_interval_minutes": 15,
        "enabled": "on",
    }
    payload.update(overrides)
    return payload


@pytest.mark.integration
@pytest.mark.django_db
def test_user_can_link_edit_pause_and_sync_separate_platform_mailboxes(client, user, monkeypatch):
    key = Fernet.generate_key().decode("ascii")
    calls = []
    monkeypatch.setattr(
        "apps.sources.views.poll_mailbox.delay",
        lambda connection_id, force=False: calls.append((connection_id, force)),
    )
    client.force_login(user)

    with override_settings(MAILBOX_CREDENTIAL_KEYS=[key]):
        response = client.post(reverse("sources:mailbox_add"), _payload())
        assert response.status_code == 302
        vdab = MailboxConnection.objects.get(user=user, platform="vdab")
        assert decrypt_mailbox_password(vdab) == "test-app-password"
        assert "test-app-password" not in vdab.encrypted_password

        response = client.post(
            reverse("sources:mailbox_add"),
            _payload(
                platform=MailboxConnection.Platform.INDEED,
                provider=MailboxConnection.Provider.OUTLOOK,
                username="indeed-alerts@example.invalid",
                password="second-app-password",
                poll_interval_minutes=30,
            ),
        )
        assert response.status_code == 302
        indeed = MailboxConnection.objects.get(user=user, platform="indeed")
        assert indeed.encrypted_password == ""

        edit_response = client.get(reverse("sources:mailbox_edit", args=[vdab.pk]))
        assert edit_response.status_code == 200
        assert b"test-app-password" not in edit_response.content
        assert vdab.encrypted_password.encode() not in edit_response.content

        original_ciphertext = vdab.encrypted_password
        response = client.post(
            reverse("sources:mailbox_edit", args=[vdab.pk]),
            _payload(
                username="vdab-updated@example.invalid",
                password="",
                poll_interval_minutes=5,
            ),
        )
        assert response.status_code == 302
        vdab.refresh_from_db()
        assert vdab.username == "vdab-updated@example.invalid"
        assert vdab.poll_interval_minutes == 5
        assert vdab.encrypted_password == original_ciphertext
        assert decrypt_mailbox_password(vdab) == "test-app-password"

        response = client.post(reverse("sources:mailbox_toggle", args=[indeed.pk]))
        assert response.status_code == 302
        indeed.refresh_from_db()
        assert indeed.enabled is False

        response = client.post(reverse("sources:sync_platform_alerts", args=[vdab.pk]))
        assert response.status_code == 302
    assert calls == [
        (vdab.pk, True),
        (indeed.pk, True),
        (vdab.pk, True),
        (vdab.pk, True),
    ]


@pytest.mark.integration
@pytest.mark.django_db
def test_sources_page_offers_all_reviewed_jobboard_mailboxes(client, user):
    client.force_login(user)

    response = client.get(reverse("sources:list"))

    assert response.status_code == 200
    for platform in MailboxConnection.Platform:
        assert f'value="{platform.value}"'.encode() in response.content
        assert f"{platform.label}-alert instellen".encode() in response.content


@pytest.mark.integration
@pytest.mark.django_db
def test_mailbox_views_are_user_scoped_and_require_encryption_key(client, user, monkeypatch):
    other = get_user_model().objects.create_user(username="other", password="test-only-password")
    other_connection = MailboxConnection.objects.create(
        user=other,
        platform=MailboxConnection.Platform.VDAB,
        provider=MailboxConnection.Provider.GMAIL,
        username="private@example.invalid",
        encrypted_password="opaque-ciphertext",
    )
    client.force_login(user)
    monkeypatch.setattr("apps.sources.views.poll_mailbox.delay", lambda *args, **kwargs: None)

    assert (
        client.get(reverse("sources:mailbox_edit", args=[other_connection.pk])).status_code == 404
    )
    assert (
        client.post(reverse("sources:sync_platform_alerts", args=[other_connection.pk])).status_code
        == 404
    )
    assert (
        client.post(reverse("sources:mailbox_toggle", args=[other_connection.pk])).status_code
        == 404
    )

    with override_settings(MAILBOX_CREDENTIAL_KEYS=[]):
        response = client.post(reverse("sources:mailbox_add"), _payload(password="visible-once"))
    assert response.status_code == 200
    assert MailboxConnection.objects.filter(user=user).count() == 0
    assert b"visible-once" not in response.content
    assert b"Credentialopslag is niet geconfigureerd" in response.content

    anonymous_response = Client().post(reverse("sources:mailbox_add"), _payload())
    assert anonymous_response.status_code == 302
    csrf_client = Client(enforce_csrf_checks=True)
    csrf_client.force_login(user)
    assert csrf_client.post(reverse("sources:mailbox_add"), _payload()).status_code == 403


@pytest.mark.integration
@pytest.mark.django_db
def test_scheduler_queues_only_due_active_mailboxes_and_claim_is_exclusive(user, monkeypatch):
    now = timezone.now()
    due = MailboxConnection.objects.create(
        user=user,
        platform=MailboxConnection.Platform.VDAB,
        provider=MailboxConnection.Provider.GMAIL,
        username="due@example.invalid",
        encrypted_password="opaque",
        next_poll_at=now - timedelta(minutes=1),
    )
    MailboxConnection.objects.create(
        user=user,
        platform=MailboxConnection.Platform.INDEED,
        provider=MailboxConnection.Provider.OUTLOOK,
        username="later@example.invalid",
        encrypted_password="opaque",
        next_poll_at=now + timedelta(minutes=20),
    )
    calls = []
    monkeypatch.setattr(
        "apps.sources.tasks.poll_mailbox.delay", lambda connection_id: calls.append(connection_id)
    )

    assert schedule_mailbox_polls() == {"scheduled": 1}
    assert calls == [due.pk]
    assert claim_mailbox_connection(connection_id=due.pk, worker_token="worker-a") is not None
    assert claim_mailbox_connection(connection_id=due.pk, worker_token="worker-b") is None


@pytest.mark.integration
@pytest.mark.django_db
def test_mailbox_task_does_not_persist_or_return_secret_on_imap_error(user, monkeypatch):
    connection = MailboxConnection.objects.create(
        user=user,
        platform=MailboxConnection.Platform.VDAB,
        provider=MailboxConnection.Provider.GMAIL,
        username="errors@example.invalid",
        encrypted_password="opaque",
        next_poll_at=timezone.now() - timedelta(minutes=1),
    )
    monkeypatch.setattr(
        "apps.sources.tasks.poll_imap_mailbox",
        lambda connection: (_ for _ in ()).throw(RuntimeError("leaked-app-password")),
    )

    result = poll_mailbox(connection.pk)
    connection.refresh_from_db()
    assert "leaked-app-password" not in str(result)
    assert "leaked-app-password" not in connection.last_error_message
    assert result == {"status": "failed", "error_category": "imap", "imported": 0}