"""Phase 12 E2E (Playwright): one header, same size on every page.

Story: ``.agents/user_stories/header-consistency.md``
Run in isolation (DB must be up: ``podman compose up -d db``):

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

The sticky top bar must be exactly ``--header-h`` tall on Chat, Sources,
and the document viewer (whose back button says "Sources" — the page
users compare against chat): 64px desktop, 58px at ≤640px.

Test → story mapping (Playwright Mapping Rule):
1. ``test_header_height_identical_across_pages_desktop``
2. ``test_header_height_identical_across_pages_mobile``
3. ``test_viewer_header_content_still_fits`` (phase-10 regression guard)

Phase 16 adaptation: the auth control (Sign in / Sign out) joins the chat
header's ``.header-inner`` — the desktop test verifies its presence in
both auth states without the bar's height moving (height assertions
unchanged).

Phase 34 adaptation (two-row viewer header, owner confirmation
2026-08-26): the viewer's ``<header>`` is now TWO rows — row 1 is the
standard shared bar (``.doc-header .app-header``, the phase-12/19
``--header-h`` contract) and row 2 is the ``.doc-titlebar`` (back +
title + meta, content-sized). The height assertions are pointed at ROW
1 — the standard bar — which must equal the chat/sources bars exactly;
the titlebar row is asserted present (height > 0), not height-pinned.
"""
from __future__ import annotations

import asyncio
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"
VIEWER_URL = "/document.html?source=docs&path=homelab%2Fkubernetes.md"
SOURCES_URL = "/sources.html"

#: The shared header-bar token values (frontend/assets/styles.css :root
#: and the ≤640px media query).
DESKTOP_HEADER_H = 64
MOBILE_HEADER_H = 58


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:
    with SessionLocal() as db:
        db.execute(text("TRUNCATE chunks, documents, query_log"))
        db.commit()
    _run_in_thread(_import_fixtures(mock_port))


def _box_height(page: Page, selector: str) -> float:
    box = page.locator(selector).bounding_box()
    assert box is not None, f"{selector} not rendered"
    return box["height"]


def _header_heights(page: Page, app_url: str) -> dict[str, float]:
    """Measured heights of the sticky top bar on the three pages."""
    heights: dict[str, float] = {}

    page.goto(app_url + "/")
    heights["chat"] = _box_height(page, ".app-header")

    page.goto(app_url + SOURCES_URL)
    heights["sources"] = _box_height(page, ".app-header")

    page.goto(app_url + VIEWER_URL)
    expect(page.locator("#doc-title")).to_have_text("Kubernetes Homelab Cluster", timeout=15_000)
    # Phase 34: the viewer header is two rows — measure ROW 1 (the
    # standard bar), which must equal the other pages' bars exactly.
    heights["document"] = _box_height(page, ".doc-header .app-header")
    return heights


# ---------------------------------------------------------------------------
# 1. Desktop: all three pages, one identical 64px bar
# ---------------------------------------------------------------------------


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

    heights = _header_heights(page, app_url)
    assert heights["chat"] == DESKTOP_HEADER_H, f"chat header {heights['chat']}px"
    assert heights["sources"] == DESKTOP_HEADER_H, f"sources header {heights['sources']}px"
    assert heights["document"] == DESKTOP_HEADER_H, (
        f"document header {heights['document']}px (was content-sized)"
    )

    # Phase 16: the auth control lives in the same bar — anonymous sees
    # "Sign in", signed-in sees "Sign out", and neither state moves the
    # height.
    page.goto(app_url + "/")
    expect(page.locator("#sign-in-link")).to_be_visible()
    expect(page.locator("#sign-out-btn")).to_be_hidden()
    assert _box_height(page, ".app-header") == DESKTOP_HEADER_H
    login(page, app_url, next="/")
    expect(page.locator("#sign-out-btn")).to_be_visible()
    expect(page.locator("#sign-in-link")).to_be_hidden()
    assert _box_height(page, ".app-header") == DESKTOP_HEADER_H


# ---------------------------------------------------------------------------
# 2. Mobile (≤640px): all three pages, one identical 58px bar
# ---------------------------------------------------------------------------


def test_header_height_identical_across_pages_mobile(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    page.set_viewport_size({"width": 375, "height": 812})
    _seed_db(mock_llm)

    heights = _header_heights(page, app_url)
    assert heights["chat"] == MOBILE_HEADER_H, f"chat header {heights['chat']}px"
    assert heights["sources"] == MOBILE_HEADER_H, f"sources header {heights['sources']}px"
    assert heights["document"] == MOBILE_HEADER_H, (
        f"document header {heights['document']}px (meta row must clip, not wrap)"
    )


# ---------------------------------------------------------------------------
# 3. Regression: the phase-10 viewer header still shows title, badges,
#    back link — single-line on both desktop and mobile
# ---------------------------------------------------------------------------


def test_viewer_header_content_still_fits(
    page: Page, app_url: str, mock_llm: int, db_ready: None
) -> None:
    """Phase 34: the phase-10 viewer content (title, badges, back link)
    survives in the titlebar ROW, and row 1 stays the pinned standard
    bar — single-line on both desktop and mobile."""
    _seed_db(mock_llm)

    for width, expected_h in ((1280, DESKTOP_HEADER_H), (375, MOBILE_HEADER_H)):
        page.set_viewport_size({"width": width, "height": 800})
        page.goto(app_url + VIEWER_URL)
        expect(
            page.locator("#doc-title")
        ).to_have_text("Kubernetes Homelab Cluster", timeout=15_000)

        # Title on a single line (ellipsis, no wrap growth).
        assert _box_height(page, "#doc-title") < 30  # one line at either size

        # Meta row: badges + path present and visible, single line.
        assert _box_height(page, ".doc-meta") < 26
        expect(page.locator(".doc-source-badge", has_text="docs")).to_be_visible()
        expect(page.locator(".format-badge", has_text="md")).to_be_visible()
        expect(page.locator(".doc-path", has_text="homelab/kubernetes.md")).to_be_visible()

        # Back link still there, ≥44px touch target, in the titlebar row.
        back = page.locator("#doc-back")
        expect(back).to_be_visible()
        assert _box_height(page, "#doc-back") >= 44

        # Phase 34 two-row contract: ROW 1 is the standard bar (the
        # pinned --header-h), and the titlebar row is present below it.
        expect(page.locator(".doc-header .app-header")).to_have_css(
            "height", f"{expected_h}px"
        )
        assert _box_height(page, ".doc-titlebar") > 0, ("the titlebar row must render")