"""Accessibility (axe, light and dark), CSP and keyboard checks in a real browser."""

import pytest
from django.conf import settings
from django.urls import reverse

from intent.comments.services import start_feature_thread

from ..test_a11y import _pages, populated  # noqa: F401  (fixture)
from .conftest import axe_violations, share_session

pytestmark = [pytest.mark.browser, pytest.mark.django_db(transaction=True)]


def _signed_out_pages(org, project, feature):
    pk = {"org_slug": org.slug, "project_slug": project.slug}
    return [
        reverse("home"),
        reverse("account_login"),
        reverse("account_signup"),
        reverse("orgs:detail", kwargs={"org_slug": org.slug}),
        reverse("projects:home", kwargs=pk),
        reverse("features:detail", kwargs={**pk, "feature_key": feature.key}),
        reverse("issues:detail", kwargs={**pk, "number": 1}),
    ]


@pytest.mark.parametrize("scheme", ["light", "dark"])
def test_axe_signed_in(axe_page, client, live_server, owner, org, project, populated, scheme):  # noqa: F811
    share_session(client, axe_page, live_server, owner)
    failures = {}
    for path in _pages(org, project, populated):
        axe_page.goto(path)
        if violations := axe_violations(axe_page, scheme):
            failures[path] = violations
    assert not failures, "\n".join(f"{p}:\n  " + "\n  ".join(v) for p, v in failures.items())


@pytest.mark.parametrize("scheme", ["light", "dark"])
def test_axe_signed_out(axe_page, org, project, populated, scheme):  # noqa: F811
    project.visibility, project.open_contribution = "public", True
    project.save()
    failures = {}
    for path in _signed_out_pages(org, project, populated):
        axe_page.goto(path)
        if violations := axe_violations(axe_page, scheme):
            failures[path] = violations
    assert not failures, "\n".join(f"{p}:\n  " + "\n  ".join(v) for p, v in failures.items())


def test_no_csp_violations_or_script_errors(page, sign_in, owner, org, project, populated):  # noqa: F811
    sign_in(owner)
    for path in _pages(org, project, populated):
        page.goto(path)
        page.wait_for_load_state("networkidle")
    assert not page.problems, "\n".join(page.problems)


def _wait_for_focus(page, selector, timeout_ms=3000):
    # Not wait_for_function: it evaluates a string, which the page's CSP rightly forbids.
    for _ in range(timeout_ms // 50):
        if page.evaluate("(s) => document.activeElement.matches(s)", selector):
            return
        page.wait_for_timeout(50)
    raise AssertionError(f"Focus never reached {selector}")


def _tab_to(page, selector, limit=80):
    """Press Tab until `selector` has focus, like a keyboard user would."""
    for _ in range(limit):
        page.keyboard.press("Tab")
        if page.evaluate("(s) => document.activeElement.matches(s)", selector):
            return
    raise AssertionError(f"Couldn't reach {selector} with Tab")


def test_keyboard_only_line_comment_and_reply(page, sign_in, owner, open_project):
    from intent.features.services import create_feature

    feature = create_feature(open_project, owner, title="Sign in", description="One\n\nTwo\n")
    thread = start_feature_thread(feature, owner, body="First")
    sign_in(owner)
    page.goto(
        reverse(
            "features:detail",
            kwargs={"org_slug": "catbriar", "project_slug": "intent", "feature_key": feature.key},
        )
    )

    # The first Tab reaches the skip link, which moves focus into the main content.
    page.keyboard.press("Tab")
    assert page.evaluate("document.activeElement.className") == "skip-link"
    page.keyboard.press("Enter")
    assert page.evaluate("document.activeElement.id") == "main"

    # Open the comment form under the second paragraph and post, all from the keyboard.
    _tab_to(page, "#L3-3 summary")
    page.keyboard.press("Enter")
    page.keyboard.press("Tab")
    assert page.evaluate("document.activeElement.id") == "body-L3-3"
    page.keyboard.type("About two")
    page.keyboard.press("Tab")
    page.keyboard.press("Enter")
    page.wait_for_selector("#L3-3 >> text=About two")

    # Reply to the general thread with HTMX; focus lands on the new comment.
    _tab_to(page, f"#reply-{thread.pk}")
    page.keyboard.type("Keyboard reply")
    page.keyboard.press("Tab")
    page.keyboard.press("Enter")
    page.wait_for_selector("text=Keyboard reply")
    _wait_for_focus(page, ".comment")
    assert "Keyboard reply" in page.evaluate("document.activeElement.textContent")
    assert not page.problems, "\n".join(page.problems)


def test_theme_choice_applies_and_persists(page):
    page.goto(reverse("home"))
    page.select_option("#theme-select", "dark")
    assert page.evaluate("document.documentElement.dataset.theme") == "dark"
    page.reload()
    assert page.evaluate("document.documentElement.dataset.theme") == "dark"
    assert page.evaluate("getComputedStyle(document.documentElement).colorScheme") == "dark"
    page.select_option("#theme-select", "system")
    assert page.evaluate("document.documentElement.dataset.theme") is None


def test_admin_pages_work_under_csp(page, client, live_server, verified_admin, populated):  # noqa: F811
    verified_admin()  # Signs `client` in with a verified device; the browser borrows it.
    cookie = client.cookies[settings.SESSION_COOKIE_NAME].value
    page.context.add_cookies(
        [{"name": settings.SESSION_COOKIE_NAME, "value": cookie, "url": live_server.url}]
    )
    for name in [
        "admin:index",
        "admin:accounts_user_changelist",
        "admin:orgs_organization_add",
        "admin:issues_issue_changelist",
    ]:
        page.goto(reverse(name))
        page.wait_for_load_state("networkidle")
        assert "/login/" not in page.url, name
    assert not page.problems, "\n".join(page.problems)