"""Phase 48 story E2E (Playwright): the nav rename — "Sources" becomes
"RAG", "Git sources" becomes "Sources".

Story: ``.agents/user_stories/nav-sources-rag-rename.md``
Run in isolation (DB must be up: ``podman compose up -d db``):

    uv run pytest tests/e2e/test_nav_rename_sources.py -v --no-cov

Owner request (2026-08-28): the two admin-only nav items read like the
same thing, so they are relabeled — the document-catalog link
(``#nav-sources`` → /sources.html) becomes **"RAG"** and the
source-manager link (``#nav-git-sources`` → /git-sources.html) becomes
**"Sources"**. Everything else is UNCHANGED (the phase's locked
decision, label-only): element ids, hrefs, the physical nav order, the
phase-16/19/35 ship-hidden/reveal contract, ``header.js`` behavior, and
every other label on the pages — the document viewer's "Sources" back
button (a different control, phase 13) and the "Sync sources" button
(phase 32) in particular.

The six pages under test (all carry the one shared header, phase
19/34): chat (/), the RAG catalog (/sources.html), the Sources manager
(/git-sources.html), Tuning (/tuning.html), the login page
(/login.html), and the document viewer (/document.html — seeded with
one fixture document row first, the test_nav_consistency.py viewer
pattern; #doc-title must settle before any bar assertion).

Contract under test (desktop viewport 1280×800, settled whoami state —
every assertion waits for the initSharedHeader pass to land first):

* admin: on EACH of the six pages ``#nav-sources`` is visible with the
  exact text "RAG" and href /sources.html, ``#nav-git-sources`` is
  visible with the exact text "Sources" and href /git-sources.html,
  and the nav DOM order reads Chat, RAG, Sources, Tuning; the
  current page's link is the ONLY one carrying is-active +
  aria-current="page" (the login and viewer pages mark none —
  neither is a nav page).
* from the chat page: clicking "RAG" (``#nav-sources``) lands on
  /sources.html with that link active; clicking "Sources"
  (``#nav-git-sources``) lands on /git-sources.html with that link
  active.
* anonymous: on / and /login.html both links are PRESENT in the DOM
  (the ship-hidden contract — header.js toggles the hidden attribute,
  the markup is never removed) but hidden, and #sign-in-link is
  visible.
* the rename did not leak: on /sources.html the Sync button still
  reads "Sync sources" (``#sync-label``), and on the settled viewer
  page the back button's span still reads "Sources" (href
  /sources.html).

Determinism note: the seed truncates documents/chunks/query_log/
steering_notes and re-imports the fixture docs (mock embeddings) so the
viewer URL resolves to "Kubernetes Homelab Cluster" on every run. No
chat turn is submitted and #sync-btn is never clicked.

Test → story mapping (Playwright Mapping Rule):
1. ``test_admin_labels_on_all_six_pages``
2. ``test_click_navigates_with_marker``
3. ``test_anonymous_sees_neither``
4. ``test_untouched_controls_stay``
"""
from __future__ import annotations

import asyncio
import re
from pathlib import Path
from threading import Thread
from typing import Any

from playwright.sync_api import Page, expect
from sqlalchemy import text

from app.config import Settings
from app.db import SessionLocal
from app.rag.importer import ImportSummary, import_sources
from app.rag.llm import LLMClient
from e2e.auth_helpers import login

REPO = Path(__file__).resolve().parents[2]
FIXTURES = REPO / "tests" / "fixtures" / "docs"

CHAT_URL = "/"
SOURCES_URL = "/sources.html"
GIT_SOURCES_URL = "/git-sources.html"
TUNING_URL = "/tuning.html"
LOGIN_URL = "/login.html"
#: A seeded fixture doc (source=docs), URL-encoded — the same document
#: every viewer suite uses (title "Kubernetes Homelab Cluster").
VIEWER_URL = "/document.html?source=docs&path=homelab%2Fkubernetes.md"
DOC_TITLE = "Kubernetes Homelab Cluster"

#: The six pages of the app, in the story's order.
SIX_PAGES = (
    ("chat", CHAT_URL),
    ("sources", SOURCES_URL),
    ("git-sources", GIT_SOURCES_URL),
    ("tuning", TUNING_URL),
    ("login", LOGIN_URL),
    ("viewer", VIEWER_URL),
)

#: The locator of the link that carries the current-page marker on each
#: page (None — login and viewer are not nav pages — marks none).
CURRENT_LINK: dict[str, str | None] = {
    "chat": ".app-nav a[href='/']",
    "sources": "#nav-sources",
    "git-sources": "#nav-git-sources",
    "tuning": "#nav-tuning",
    "login": None,
    "viewer": None,
}

#: The four primary nav links, in their physical DOM order — the labels
#: after the phase-48 swap (ids/hrefs unchanged).
NAV_LABELS = ("Chat", "RAG", "Sources", "Tuning")
#: The FIFTH–SEVENTH a.nav-link in every page header (phase 53
#: saved-chat history + phase 79 task 06 access tokens + phase 91
#: theme tab — all ship-hidden, revealed by header.js for admins).
#: The DOM enumeration below therefore always sees them (pre-existing;
#: the list matches the real nav — the phase-34 one-bar contract ships
#: the SAME nav, incl. the Tokens and Theme links, on every page).
NAV_TAIL = ("History", "Tokens", "Theme")

#: The login.js script — route pattern for the redirect suppression.
LOGIN_JS_ROUTE = re.compile(r"/assets/login\.js(\?.*)?$")

#: is-active as a word-boundary regex (to_have_class matches against the
#: whole class string — the test_git_sources_admin.py convention).
IS_ACTIVE = re.compile(r"\bis-active\b")


async def _import_fixtures(mock_port: int) -> ImportSummary:
    kwargs: dict[str, Any] = {"_env_file": None, "llm_base_url": f"http://127.0.0.1:{mock_port}/v1"}
    settings = Settings(**kwargs)  # pyright: ignore[reportCallIssue]
    return await import_sources([FIXTURES], LLMClient(settings))


def _run_in_thread(coro: Any) -> Any:
    """Run a coroutine on a worker thread (Playwright owns the test loop)."""
    box: dict[str, Any] = {}

    def runner() -> None:
        try:
            box["value"] = asyncio.run(coro)
        except BaseException as e:  # noqa: BLE001 — re-raised on the test thread
            box["error"] = e

    t = Thread(target=runner)
    t.start()
    t.join()
    if "error" in box:
        raise box["error"]
    return box["value"]


def _seed_db(mock_port: int) -> None:
    """Fresh KB + the fixture docs so the viewer URL resolves (the
    test_nav_consistency.py seeding pattern)."""
    with SessionLocal() as db:
        db.execute(text("TRUNCATE chunks, documents, query_log, steering_notes"))
        db.commit()
    _run_in_thread(_import_fixtures(mock_port))


def _wait_settled_admin(page: Page) -> None:
    """Wait for initSharedHeader's whoami toggle to land for a signed-in
    admin: the whoami reveal has un-hidden the admin-only nav links. The
    nav link is the viewport-independent settled signal (the auth pair is
    the bar copy on desktop but the dropdown copy at ≤640px, phase 46) —
    and the sign-in/out state settles in the SAME initSharedHeader pass.
    """
    page.wait_for_function(
        "() => !document.querySelector('#nav-sources').hasAttribute('hidden')",
        timeout=15_000,
    )


def _wait_settled_anonymous(page: Page) -> None:
    """Wait for the whoami toggle to land for an anonymous visitor: the
    bar Sign in copy (``#sign-in-link``) loses its ship-hidden attribute
    (probed by attribute — at ≤640px the bar copy is CSS-hidden behind
    the dropdown copy, phase 46)."""
    page.wait_for_function(
        "() => !document.querySelector('#sign-in-link').hasAttribute('hidden')",
        timeout=15_000,
    )


def _assert_renamed_labels(page: Page, name: str) -> None:
    """AC1 on one page: the swapped labels, the unchanged hrefs, and the
    nav DOM order (Chat, RAG, Sources, Tuning) on a settled admin bar."""
    rag = page.locator("#nav-sources")
    expect(rag).to_be_visible(timeout=15_000)
    expect(rag).to_have_text("RAG")
    expect(rag).to_have_attribute("href", "/sources.html")

    git = page.locator("#nav-git-sources")
    expect(git).to_be_visible(timeout=15_000)
    expect(git).to_have_text("Sources")
    expect(git).to_have_attribute("href", "/git-sources.html")

    # The nav links (class nav-link) in physical DOM order — the four
    # primaries plus the admin-only History (phase 53), Tokens
    # (phase 79 task 06) and Theme (phase 91) tail links.
    nav_texts = page.eval_on_selector_all(
        ".app-nav a.nav-link", "els => els.map(e => e.textContent.trim())"
    )
    assert nav_texts == [*NAV_LABELS, *NAV_TAIL], (
        f"{name}: nav link order/labels are {nav_texts}, expected "
        f"{[*NAV_LABELS, *NAV_TAIL]}"
    )
    # …and the full anchor sequence of the nav (it also carries the
    # phase-46 mobile sign-in copy) opens with the same four, in order.
    all_texts = page.eval_on_selector_all(
        ".app-nav a", "els => els.map(e => e.textContent.trim())"
    )
    assert all_texts[:4] == list(NAV_LABELS), (
        f"{name}: .app-nav anchor sequence {all_texts} does not open with "
        f"Chat, RAG, Sources, Tuning"
    )


def _assert_current_marker(page: Page, name: str) -> None:
    """AC1 on one page: the current page's link carries is-active +
    aria-current="page" — and ONLY it does (login/viewer mark none)."""
    current = CURRENT_LINK[name]
    if current is None:
        assert page.locator(".app-nav a.is-active").count() == 0, (
            f"{name}: no nav page is current — no link may carry is-active"
        )
        assert page.locator('.app-nav a[aria-current="page"]').count() == 0, (
            f"{name}: no nav page is current — no link may carry aria-current"
        )
        return
    expect(page.locator(current)).to_have_class(IS_ACTIVE)
    expect(page.locator(current)).to_have_attribute("aria-current", "page")
    assert page.locator(".app-nav a.is-active").count() == 1, (
        f"{name}: exactly one nav link may carry is-active"
    )
    assert page.locator('.app-nav a[aria-current="page"]').count() == 1, (
        f"{name}: exactly one nav link may carry aria-current"
    )


def _visit_admin_page(page: Page, app_url: str, name: str, url: str) -> None:
    """Goto a page as the signed-in admin, wait for the settled header
    (and the document title on the viewer), assert the rename contract."""
    page.goto(app_url + url)
    _wait_settled_admin(page)
    if name == "viewer":
        # The document itself has settled (rendered, not Loading…/
        # not-found) before any bar assertion — the test_nav_consistency
        # viewer-pass pattern.
        expect(page.locator("#doc-title")).to_have_text(DOC_TITLE, timeout=15_000)
    _assert_renamed_labels(page, name)
    _assert_current_marker(page, name)


def _visit_login_as_admin(page: Page, app_url: str) -> None:
    """The login page redirects a signed-in admin away (login.js —
    phase 16), so this ONE visit serves login.js with the redirect lines
    suppressed (a test-local route, the test_nav_consistency.py pattern;
    the page's header — settled by the same initSharedHeader pass — is
    what gets measured, and the page stays put).

    The browser cache is cleared first: phase 33 caches ``/assets/*``
    ``immutable`` for a year, and the earlier form login already fetched
    the (unmodified) login.js — a cache hit would bypass the route.
    """
    login_js = (REPO / "frontend" / "assets" / "login.js").read_text(encoding="utf-8")
    assert "window.location.replace(safeNext())" in login_js
    suppressed = login_js.replace(
        "window.location.replace(safeNext())",
        "window.__e2e_redirectSuppressed = true; // test: observe the header",
    )
    page.route(
        LOGIN_JS_ROUTE,
        lambda route: route.fulfill(
            status=200, content_type="text/javascript", body=suppressed
        ),
    )
    try:
        cdp = page.context.new_cdp_session(page)
        try:
            cdp.send("Network.clearBrowserCache")
        finally:
            cdp.detach()
        page.goto(app_url + LOGIN_URL)
        expect(page).to_have_url(app_url + LOGIN_URL, timeout=15_000)
        _visit_admin_page(page, app_url, "login", LOGIN_URL)
    finally:
        page.unroute(LOGIN_JS_ROUTE)


# ---------------------------------------------------------------------------
# 1. Admin: the swapped labels, unchanged hrefs/order/markers, on all
#    six pages
# ---------------------------------------------------------------------------


def test_admin_labels_on_all_six_pages(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    page.set_viewport_size({"width": 1280, "height": 800})
    _seed_db(mock_llm)

    login(page, app_url, next=CHAT_URL)
    expect(page).to_have_url(app_url + CHAT_URL, timeout=30_000)

    for name, url in SIX_PAGES:
        if name == "login":
            _visit_login_as_admin(page, app_url)
        else:
            _visit_admin_page(page, app_url, name, url)


# ---------------------------------------------------------------------------
# 2. The renamed links navigate: "RAG" → /sources.html (active),
#    "Sources" → /git-sources.html (active)
# ---------------------------------------------------------------------------


def test_click_navigates_with_marker(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    page.set_viewport_size({"width": 1280, "height": 800})
    _seed_db(mock_llm)

    login(page, app_url, next=CHAT_URL)
    expect(page).to_have_url(app_url + CHAT_URL, timeout=30_000)
    _wait_settled_admin(page)

    # "RAG" (the renamed catalog label) → the RAG catalog page, where
    # #nav-sources is the active link.
    expect(page.locator("#nav-sources")).to_have_text("RAG")
    page.click("#nav-sources")
    expect(page).to_have_url(app_url + SOURCES_URL, timeout=30_000)
    _wait_settled_admin(page)
    _assert_current_marker(page, "sources")

    # "Sources" (the renamed manager label) → the Sources manager page,
    # where #nav-git-sources is the active link.
    page.goto(app_url + CHAT_URL)
    _wait_settled_admin(page)
    expect(page.locator("#nav-git-sources")).to_have_text("Sources")
    page.click("#nav-git-sources")
    expect(page).to_have_url(app_url + GIT_SOURCES_URL, timeout=30_000)
    _wait_settled_admin(page)
    _assert_current_marker(page, "git-sources")


# ---------------------------------------------------------------------------
# 3. Anonymous: both links present in the DOM (ship-hidden contract) but
#    hidden — #sign-in-link visible
# ---------------------------------------------------------------------------


def test_anonymous_sees_neither(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    page.set_viewport_size({"width": 1280, "height": 800})
    _seed_db(mock_llm)

    # No login: a fresh context is anonymous by construction.
    for name, url in (("chat", CHAT_URL), ("login", LOGIN_URL)):
        page.goto(app_url + url)
        _wait_settled_anonymous(page)
        rag = page.locator("#nav-sources")
        git = page.locator("#nav-git-sources")
        # Present in the DOM (the markup ships, header.js toggles the
        # hidden attribute)…
        assert rag.count() == 1, f"{name}: #nav-sources must be in the DOM"
        assert git.count() == 1, f"{name}: #nav-git-sources must be in the DOM"
        # …and hidden for anonymous (the ship-hidden contract, unchanged
        # by the rename).
        expect(rag).to_be_hidden()
        expect(git).to_be_hidden()
        # The reduced bar's settled sign-in control is visible.
        expect(page.locator("#sign-in-link")).to_be_visible()


# ---------------------------------------------------------------------------
# 4. The rename did not leak: the Sync button label and the viewer back
#    button label (different controls) are untouched
# ---------------------------------------------------------------------------


def test_untouched_controls_stay(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    page.set_viewport_size({"width": 1280, "height": 800})
    _seed_db(mock_llm)

    # On /sources.html (admin — the button ships hidden and the page
    # boot reveals it on the same cached whoami) the Sync button still
    # reads "Sync sources".
    login(page, app_url, next=SOURCES_URL)
    expect(page).to_have_url(app_url + SOURCES_URL, timeout=30_000)
    _wait_settled_admin(page)
    expect(page.locator("#sync-btn")).to_be_visible(timeout=15_000)
    expect(page.locator("#sync-label")).to_have_text("Sync sources")
    # Never clicked — a real sync is test_sync_button.py's job.

    # On the settled viewer page the back button's span still reads
    # "Sources" (the viewer back link is a different control — phase 13;
    # the rename only touched the nav items).
    page.goto(app_url + VIEWER_URL)
    expect(page.locator("#doc-title")).to_have_text(DOC_TITLE, timeout=15_000)
    back = page.locator("#doc-back")
    expect(back).to_have_attribute("href", "/sources.html")
    expect(back.locator("span")).to_have_text("Sources")