"""Phase 86 E2E (Playwright): the table pages are viewport-width — the
owner's "the page is the width of the table" bug, pinned.

Source: ``TODO.md`` L4 (owner bug report, 2026-09-07): "The history page
appears to be the width of the table despite the table being scrollable.
On mobile this results in half the page being blank and awkwardly
scrollable."
Story: n/a (owner bug report — ``TODO.md`` L4 is the story; no
``.agents/user_stories/`` file).

Run in isolation (DB must be up: ``podman compose up -d db``):

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

The bug (confirmed by live reproduction, 375×812, signed-in admin):
the History and Tokens tables carry ``position: absolute``
``.visually-hidden`` elements (the ``<caption>`` + the Actions column
header span). No ancestor in the chain was positioned, so their 1px
boxes were laid out against the INITIAL containing block — the Actions
span at the 640px table's right edge — and leaked into the DOCUMENT's
scrollable overflow, bypassing the card's own ``overflow-x: auto``
scrolling. Measured ``documentElement.scrollWidth`` at 375px:
``/history.html`` **626**, ``/tokens.html`` **618** (the byte-identical
defect, folded in per owner decision A3), ``/sources.html`` **375**
(clean — the RAG table's headers are visible text). The fix is ONE CSS
property (phase 86, task 01): ``position: relative`` on the shared
``.table-wrap`` card, which becomes the containing block for those
spans. This suite pins the FIXED contract: the document never pans
past the viewport, the 640px tables still scroll INSIDE their cards
(the phase-07 / AGENTS.md-rule-5 full-width contract), the a11y spans
stay in the DOM, and the RAG view + the desktop layout are unchanged.

Counterfactual (verified red→green in the phase session): with the
task-01 rule reverted (no ``position: relative`` on ``.table-wrap``),
``test_history_page_is_viewport_width`` fails at its
``scrollWidth <= innerWidth`` pin (626 > 375); restored, it is green.

Test → contract mapping (Playwright Mapping Rule):

1. ``test_history_page_is_viewport_width`` — THE TODO.md L4 pin: admin
   at 375×812, direct ``/history.html`` —
   ``documentElement.scrollWidth <= innerWidth`` (626 → ≤375), the
   table still scrolls INSIDE ``#history-table-wrap``
   (``scrollWidth > clientWidth`` — the 640px ``min-width``), the card
   is the container's content width (≤ the viewport), and the
   visually-hidden Actions header + caption survived the fix (the a11y
   names are intact).
2. ``test_tokens_page_is_viewport_width`` — the folded-in identical
   defect (618 pre-fix): the same two pins on direct ``/tokens.html``
   for ``#tokens-table-wrap``.
3. ``test_spa_switch_keeps_page_width`` — the invariant survives the
   router, not just direct loads: at 375px on ``/history.html`` the
   mobile menu (a REAL ``#nav-toggle`` click — the phase-85 contract)
   opens, the Tokens link switches the view IN THE SAME DOCUMENT
   (the phase-76 window-sentinel proof — a real navigation would wipe
   ``window`` globals), and the Tokens page is still viewport-width
   with its table still scrolling in-card.
4. ``test_rag_view_regression`` — ``/sources.html`` at 375px: no
   overflow (it was already clean at 375 pre-fix — pinned so the
   shared-rule change cannot regress it) AND the RAG table is still
   full-width inside its card (in-card scroll — the 640px
   ``min-width`` still engages).
5. ``test_desktop_unchanged`` — 1280×800 regression on ALL THREE
   views: no document overflow at any width, and the tables render at
   container width (the cards need no internal scroll —
   ``scrollWidth <= clientWidth + 1``, the card is far wider than the
   mobile 346px).

House conventions: a fresh 375×812 page per mobile test via the
session ``browser`` fixture (the conftest ``page`` is 1280×800),
``e2e.auth_helpers.login`` for the real form login, ``_wait_settled_admin``
copied from ``test_mobile_hamburger_nav.py`` (suites stay
self-contained — helpers copied, only ``auth_helpers`` imported).
Data: the History/Tokens contract holds with EMPTY tables (static
thead + the 640px ``min-width`` — no rows needed, and the suite never
depends on saved chats or issued tokens — test 5 ENFORCES that state,
resetting ``saved_chats`` (TRUNCATE, the house precedent) and the
``e2e-``-labeled tokens (label-scoped delete) before pinning, because
other suites leave chats on the shared dev DB and a single History
row pushes the table's auto-layout minimum width past the 1110px
desktop card). The RAG view, by contrast,
HIDES its table and shows the "Nothing indexed yet" empty state on an
empty KB, so tests 4 and 5 seed the KB the house way (truncate +
import the 13 fixture docs, deterministic mock embeddings) and pin
nothing about the rows themselves — only that the table is up and
full-width.
"""
from __future__ import annotations

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

from playwright.sync_api import Browser, JSHandle, Page, ViewportSize, 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"

MOBILE: ViewportSize = {"width": 375, "height": 812}  # the bug-report phone viewport
DESKTOP: ViewportSize = {"width": 1280, "height": 800}  # the conftest page size


async def _import_fixtures(mock_port: int) -> ImportSummary:
    """The house KB seed (copied from ``test_api_tokens.py``): import
    the fixture docs against the mock LLM's embeddings."""
    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's sync API keeps an asyncio loop running on the test
    thread, so ``asyncio.run`` cannot be called directly from a test
    body.
    """
    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_kb(mock_port: int) -> ImportSummary:
    """House reset (truncate the KB + the prompt-shaping tables so the
    mock answers stay deterministic) + the fixture re-import — the
    RAG view hides its table on an empty KB, so the two tests that
    pin it need at least the fixture docs present. ``saved_chats`` and
    ``api_tokens`` are deliberately NOT touched (the house pattern)."""
    with SessionLocal() as db:
        db.execute(text("TRUNCATE chunks, documents, query_log, steering_notes"))
        db.commit()
    return _run_in_thread(_import_fixtures(mock_port))


def _mobile_page(browser: Browser) -> Page:
    """A fresh 375×812 page (the conftest ``page`` is 1280×800)."""
    return browser.new_page(viewport=MOBILE)


def _wait_settled_admin(page: Page) -> None:
    """Wait until whoami has resolved for the admin: the whoami reveal
    has un-hidden the admin-only nav links — the viewport-independent
    settled signal (copied from ``test_mobile_hamburger_nav.py``; the
    sign-out control is viewport-dependent and not a cross-viewport
    probe)."""
    page.wait_for_function(
        "() => !document.querySelector('#nav-sources').hasAttribute('hidden')",
        timeout=10_000,
    )


def _open_menu(page: Page) -> None:
    """Open the mobile menu with a REAL click on the toggle (the
    phase-85 contract: the gate sits below the header, so a real tap
    reaches the toggle; for a signed-in admin the gate is hidden
    anyway)."""
    page.click("#nav-toggle")
    expect(page.locator("#nav-toggle")).to_have_attribute("aria-expanded", "true")


def _wrap_handle(page: Page, view: str) -> JSHandle:
    """The table card (``.table-wrap``) of ``view``: the id'd cards for
    history/tokens, the RAG card found through its ``.docs-table``
    (that card is the only one without an id)."""
    if view == "sources":
        return page.evaluate_handle(
            "() => document.querySelector('.docs-table').closest('.table-wrap')"
        )
    return page.evaluate_handle(f"() => document.querySelector('#{view}-table-wrap')")


def _reset_history_and_e2e_tokens() -> None:
    """The desktop pin's data state (see ``test_desktop_unchanged``):
    an empty History table + no e2e-issued tokens — the row-width
    interaction (auto table layout vs the 72rem card) is not the
    contract under test, and other suites leave saved chats on the
    shared dev DB. ``saved_chats``: TRUNCATE (the
    ``test_bottom_chat_actions.py`` precedent); ``api_tokens``:
    label-scoped ``e2e-`` delete only (the ``test_api_tokens.py``
    pattern — the dev DB may hold the owner's real tokens)."""
    with SessionLocal() as db:
        db.execute(text("TRUNCATE saved_chats"))
        db.execute(text("DELETE FROM api_tokens WHERE label LIKE 'e2e-%'"))
        db.commit()


def _assert_viewport_width(page: Page, label: str) -> None:
    """THE pin (TODO.md L4): the document itself never pans past the
    viewport — pre-fix, /history.html measured 626 and /tokens.html
    618 at this 375px viewport."""
    report = page.evaluate(
        "() => ({ doc: document.documentElement.scrollWidth, inner: window.innerWidth })"
    )
    assert report["doc"] <= report["inner"], (
        f"{label}: the document panned to {report['doc']}px at a "
        f"{report['inner']}px viewport — the TODO.md L4 defect "
        '(the page is "the width of the table"); the .table-wrap card '
        "must be the containing block for the positioned "
        ".visually-hidden spans (position: relative, phase 86)"
    )


def _assert_in_card_scroll(page: Page, wrap: JSHandle, label: str) -> None:
    """The phase-07 / AGENTS.md-rule-5 contract the fix preserves: the
    640px table scrolls INSIDE the card (``overflow-x: auto``), the
    card is the container's content width (≤ the viewport), and the
    table's ``min-width: 640px`` is what the in-card scroll is over."""
    report = wrap.evaluate(
        """el => {
            const c = el.closest('.container');
            const cs = getComputedStyle(c);
            const ws = getComputedStyle(el);
            return {
                scroll: el.scrollWidth,
                client: el.clientWidth,
                // The container's content width minus the card's own
                // borders (clientWidth excludes them) — the card fills
                // the row edge to edge.
                content: c.clientWidth - parseFloat(cs.paddingLeft) - parseFloat(cs.paddingRight)
                          - parseFloat(ws.borderLeftWidth) - parseFloat(ws.borderRightWidth),
                inner: window.innerWidth,
                table: el.querySelector('table').scrollWidth,
            };
        }"""
    )
    assert report["table"] >= 640, (
        f"{label}: the table must keep its 640px min-width, got {report['table']}px"
    )
    assert report["scroll"] > report["client"], (
        f"{label}: the 640px table must still scroll INSIDE the card "
        f"(card {report['client']}px < table {report['table']}px)"
    )
    assert report["client"] <= report["inner"], (
        f"{label}: the card must not exceed the viewport "
        f"({report['client']}px > {report['inner']}px)"
    )
    assert abs(report["client"] - report["content"]) <= 1, (
        f"{label}: the card must fill the container's content width "
        f"(card {report['client']}px vs container {report['content']}px)"
    )


def _assert_hidden_a11y_spans(page: Page, wrap_sel: str) -> None:
    """The a11y names survived the fix: the visually-hidden Actions
    column header and the table caption are still in the DOM (the fix
    repositioned their CONTAINING BLOCK — it did not remove them)."""
    expect(page.locator(f"{wrap_sel} th .visually-hidden")).to_have_count(1)
    expect(page.locator(f"{wrap_sel} th .visually-hidden")).to_have_text("Actions")
    expect(page.locator(f"{wrap_sel} caption.visually-hidden")).to_have_count(1)


# ---------------------------------------------------------------------------
# 1. THE TODO.md L4 pin: /history.html is viewport-width at 375px
# ---------------------------------------------------------------------------


def test_history_page_is_viewport_width(
    browser: Browser, app_url: str, db_ready: None
) -> None:
    """THE TODO.md L4 pin: admin at 375×812, direct ``/history.html`` —
    the document is viewport-width (pre-fix ``scrollWidth`` 626 — the
    page panned ~250px into a blank region, "half the page being
    blank"), the 640px table still scrolls INSIDE
    ``#history-table-wrap`` (the phase-07 / AGENTS.md-rule-5
    full-width contract), and the visually-hidden Actions header +
    caption are still in the DOM (the a11y names survived the fix)."""
    page = _mobile_page(browser)
    try:
        login(page, app_url, next="/history.html")
        _wait_settled_admin(page)
        expect(page.locator("#history-table-wrap")).to_be_visible(timeout=15_000)

        _assert_viewport_width(page, "/history.html (direct)")
        _assert_in_card_scroll(page, _wrap_handle(page, "history"), "/history.html")
        _assert_hidden_a11y_spans(page, "#history-table-wrap")
    finally:
        page.close()


# ---------------------------------------------------------------------------
# 2. The folded-in identical defect: /tokens.html (618 pre-fix)
# ---------------------------------------------------------------------------


def test_tokens_page_is_viewport_width(
    browser: Browser, app_url: str, db_ready: None
) -> None:
    """The owner-confirmed A3 fold-in: the Tokens view carries the
    byte-identical defect (measured ``scrollWidth`` 618 pre-fix — the
    same visually-hidden Actions header + caption, no positioned
    ancestor) and is fixed by the SAME one-rule ``.table-wrap`` fix.
    Same two pins as test 1, on direct ``/tokens.html`` for
    ``#tokens-table-wrap``."""
    page = _mobile_page(browser)
    try:
        login(page, app_url, next="/tokens.html")
        _wait_settled_admin(page)
        expect(page.locator("#tokens-table-wrap")).to_be_visible(timeout=15_000)

        _assert_viewport_width(page, "/tokens.html (direct)")
        _assert_in_card_scroll(page, _wrap_handle(page, "tokens"), "/tokens.html")
        _assert_hidden_a11y_spans(page, "#tokens-table-wrap")
    finally:
        page.close()


# ---------------------------------------------------------------------------
# 3. The invariant survives the router (not just direct loads)
# ---------------------------------------------------------------------------


def test_spa_switch_keeps_page_width(
    browser: Browser, app_url: str, db_ready: None
) -> None:
    """At 375px on ``/history.html``: open the mobile menu (a REAL
    ``#nav-toggle`` click — the phase-85 contract; at this width the
    nav links live in the dropdown), click the Tokens link — a
    CLIENT-SIDE view switch in the phase-76 shell, so the same-document
    proof is the phase-76 canonical one: the window sentinel set
    before the click is still readable after it (a real document load
    would wipe ``window`` globals; the navigation-timeline count is
    deliberately NOT used — a real load resets it, so it cannot
    distinguish pushState from a reload). On arrival the Tokens page
    keeps BOTH pins: viewport-width AND the table still scrolling
    inside its card."""
    page = _mobile_page(browser)
    try:
        login(page, app_url, next="/history.html")
        _wait_settled_admin(page)
        expect(page.locator("#history-table-wrap")).to_be_visible(timeout=15_000)
        _assert_viewport_width(page, "/history.html (pre-switch)")

        # THE SWITCH (mobile menu → Tokens link), same document:
        page.evaluate("() => { window.__phase86_width = 'phase86'; }")
        _open_menu(page)
        page.click("#nav-tokens")
        expect(page).to_have_url(app_url + "/tokens.html", timeout=15_000)
        assert page.evaluate("() => window.__phase86_width") == "phase86", (
            "a real document load would have wiped the window sentinel — "
            "the view switch must be same-document (the phase-76 router)"
        )

        expect(page.locator("#tokens-table-wrap")).to_be_visible(timeout=15_000)
        _assert_viewport_width(page, "/tokens.html (SPA switch)")
        _assert_in_card_scroll(page, _wrap_handle(page, "tokens"), "/tokens.html (SPA)")
    finally:
        page.close()


# ---------------------------------------------------------------------------
# 4. Regression: the RAG view (already clean) stays clean + full-width
# ---------------------------------------------------------------------------


def test_rag_view_regression(
    browser: Browser, app_url: str, mock_llm: int, db_ready: None
) -> None:
    """``/sources.html`` at 375px (admin): the RAG view measured clean
    pre-fix (``scrollWidth`` 375 — the ``.docs-table`` headers are
    visible text, no positioned hidden spans at the table's right
    edge). Pinned so the shared ``.table-wrap`` rule change cannot
    regress it — AND its table is still full-width inside the card:
    the 640px ``min-width`` still engages, so the card keeps its
    in-card scroll (the shared rule added a containing block, not a
    width)."""
    summary = _seed_kb(mock_llm)
    assert summary is not None and summary.added == 13  # A9 formats (phase 47 added quadlet+j2)
    page = _mobile_page(browser)
    try:
        login(page, app_url, next="/sources.html")
        _wait_settled_admin(page)
        expect(page.locator(".docs-table")).to_be_visible(timeout=15_000)

        _assert_viewport_width(page, "/sources.html (direct)")
        _assert_in_card_scroll(page, _wrap_handle(page, "sources"), "/sources.html")
    finally:
        page.close()


# ---------------------------------------------------------------------------
# 5. Desktop regression: no overflow anywhere, tables at container width
# ---------------------------------------------------------------------------


def test_desktop_unchanged(
    browser: Browser, app_url: str, mock_llm: int, db_ready: None
) -> None:
    """1280×800 regression on ALL THREE table views: no document
    overflow at any width, and each table renders at container width —
    the cards need no internal scroll
    (``wrap.scrollWidth <= wrap.clientWidth + 1``) and are far wider
    than the mobile 346px card. The zero-offset
    ``position: relative`` changed no layout, so desktop is
    byte-identical in behavior. The KB is seeded the house way for
    the RAG view's table (it hides itself on an empty KB).

    Data state: the desktop pin is enforced on the EMPTY-table state
    the module docstring declares ("the History/Tokens contract holds
    with EMPTY tables") — the History table's auto layout cannot fit
    ROWS in the 1110px 72rem card (the nowrap date/share/actions
    cells + the ellipsized title column at its 34rem ``max-width``
    sum to ~1130px of minimum column width), and other suites on the
    shared dev DB (e.g. ``test_responsive_polish``) leave saved chats
    behind. So this test resets the state it pins: ``saved_chats``
    TRUNCATEd (the ``test_bottom_chat_actions.py`` house precedent —
    the table is rendered empty here, rows are not under test) and
    the ``e2e-``-labeled tokens deleted (the ``test_api_tokens.py``
    label-scoped pattern — never a TRUNCATE; the shared dev DB may
    hold the owner's real tokens)."""
    summary = _seed_kb(mock_llm)
    assert summary is not None and summary.added == 13
    _reset_history_and_e2e_tokens()
    page = browser.new_page(viewport=DESKTOP)
    try:
        login(page, app_url, next="/history.html")
        _wait_settled_admin(page)

        views = (
            ("history", "/history.html"),
            ("tokens", "/tokens.html"),
            ("sources", "/sources.html"),
        )
        for i, (view, path) in enumerate(views):
            if i:  # the first view is the login landing
                page.goto(app_url + path)
                _wait_settled_admin(page)
            marker = ".docs-table" if view == "sources" else f"#{view}-table-wrap"
            expect(page.locator(marker)).to_be_visible(timeout=15_000)

            _assert_viewport_width(page, f"{path} (desktop)")
            report = _wrap_handle(page, view).evaluate(
                "el => ({ scroll: el.scrollWidth, client: el.clientWidth })"
            )
            assert report["client"] > 346, (
                f"{path} (desktop): the table card must render at container "
                f"width, got {report['client']}px (the mobile card is 346px)"
            )
            assert report["scroll"] <= report["client"] + 1, (
                f"{path} (desktop): no in-card scroll is needed at this width "
                f"(table {report['scroll']}px in a {report['client']}px card)"
            )
    finally:
        page.close()