"""Phase 100 E2E (Playwright): every page matches the RAG page's width —
the full 72rem container at every viewport, measured bounding boxes.

Owner request (chat, 2026-09-12): "The theme, tuning, and chat pages
are still pretty narrow, I want you to match the width of the RAG page
for all other pages to keep things consistent." — SUPERSEDES the
phase-58 2026-08-31 46rem/92rem reading-column contract (recorded per
the phase-94/96/97 convention in `.agents/phases/todo/
100_page_width_consistency/00_phase.md`, decisions D1–D4). The phase-58
suite this file used to be updates IN PLACE to the new contract (the
phase-97 task-07/08 precedent: a completed phase's suite follows its
changed contract; its seeding helpers are kept).

The measured contract (the 16px root, the ±4px tolerance is the task
spec):

* the container is ``min(100%, 72rem)`` border-box with the 2×1.25rem
  gutters INSIDE the box — at any viewport ≥ ~1200px every shell
  (``.container.*-shell``) measures **1152px** (72rem), identical on
  the chat page, Tuning, Theme, and the RAG page;
* the standalone ``document.html`` page's ``.doc-md`` is the container's
  inner content — **1112px** (1152 − 2×1.25rem);
* the same-page document MODAL is untouched (D2): the panel stays
  **~1100px** and the panel binds the ``.doc-md`` inside it —
  **1058px** (1100 − 2×1px borders − 2×1.25rem of
  ``.doc-modal-content`` padding), NOT 1152;
* below the container cap everything is full-width as before: at 360px
  no horizontal overflow and the shell is the viewport width; at 900px
  chat/tuning/theme all measure 900px (equal — the cap never bound
  below 72rem anyway).

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

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

Test → contract mapping:

1. ``test_all_columns_match_the_rag_page`` — the core pin: at
   1280×800 the ``.chat-shell`` (``/``), ``.tuning-shell``
   (``/tuning.html``), ``.theme-shell`` (``/theme.html``) and the RAG
   page's ``.sources-shell`` (``/sources.html``) bounding boxes are ALL
   EQUAL (±4px) — the owner's "match the width of the RAG page" as one
   assertion; at 1920×1080 the same four are still equal to each other
   and each measures ≈1152px (72rem, ±4px).
2. ``test_reader_columns_wide`` — the token's consumers at 1920×1080:
   the modal panel is still ~1100px (D2: the modal is UNCHANGED) with
   its ``.doc-md`` at ~1058px; ``/shared/<token>``'s ``.shared-shell``
   is ≈1152px; the standalone ``document.html`` page's ``.doc-md`` is
   ≈1112px (the 72rem container's inner content).
3. ``test_narrow_unchanged`` — the no-regression leg: at 360×800 no
   horizontal overflow and ``.chat-shell`` is the viewport width
   (full-bleed — the mobile gutters sit in the container's padding,
   inside the measured box); at 900×600 chat/tuning/theme are all
   900px wide, equal to each other.

DB isolation: the shared-chat row is deleted in a ``finally`` (admin
cookie — the house pattern of test_share_chat.py, whose distinctive
question text keeps the auto-title unique); the fixture document rows
follow the story-fixture convention of the sibling suites (truncate +
re-import; the viewer fixture is a direct row insert — the viewer is
database-only, the test_document_viewer.py XSS-fixture pattern).
"""
from __future__ import annotations

import asyncio
import re
import time
from datetime import UTC, datetime
from pathlib import Path
from threading import Thread
from typing import Any

import httpx
from playwright.sync_api import Browser, Page, ViewportSize, expect
from sqlalchemy import text

from app.config import Settings
from app.db import SessionLocal
from app.models import Document
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"

# The phase-100 measured contract (16px root, the task spec):
# * CONTAINER_PX — 72rem border-box, the 2×1.25rem gutters INSIDE the
#   box; every .container.*-shell measures this at any viewport
#   >= ~1200px (the RAG page's width — the owner's ask).
# * DOC_MD_STANDALONE_PX — the standalone document page's .doc-md: the
#   container's inner content (CONTAINER_PX minus the gutters).
# * MODAL_PANEL_PX / DOC_MD_MODAL_PX — the SAME-PAGE modal is untouched
#   (D2): the 1100px border-box panel (minus its 1px borders) and
#   .doc-modal-content's 2×1.25rem padding bind the .doc-md inside it.
CONTAINER_PX = 72 * 16  # 1152px — the 72rem container (border-box)
DOC_MD_STANDALONE_PX = CONTAINER_PX - 2 * 20  # 1112px — inner content
MODAL_PANEL_PX = 1100  # the phase-26 panel ceiling (D2: unchanged)
DOC_MD_MODAL_PX = MODAL_PANEL_PX - 2 - 2 * 20  # 1058px — panel-inner
TOL_PX = 4  # the task spec's ±4px tolerance
VIEWPORT_1280: ViewportSize = {"width": 1280, "height": 800}
VIEWPORT_1920: ViewportSize = {"width": 1920, "height": 1080}

MOCK_ANSWER_MARKER = "Deterministic mock answer for E2E"
SHARE_URL_RE = re.compile(r"^/shared/[0-9a-f-]{36}$")

#: The seeded markdown document (direct row insert — the viewer is
#: database-only, so no fixture file is needed). Encoded viewer URL
#: values: slashes come out as %2F, same as the chips build them.
FIXTURE_SOURCE = "docs"
FIXTURE_PATH = "notes/wide-column-fixture.md"
FIXTURE_TITLE = "Wide Column Fixture"
FIXTURE_DOC_URL = "/document.html?source=docs&path=notes%2Fwide-column-fixture.md"


# ---------------------------------------------------------------------------
# KB seeding (house pattern — test_document_viewer.py / test_share_chat.py)
# ---------------------------------------------------------------------------


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'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 _reset_db(mock_port: int, seed: bool) -> ImportSummary | None:
    """Truncate the KB (and query log + steering notes — deterministic
    mock answers), then optionally re-import fixtures. ``saved_chats``
    is deliberately NOT touched: the shared test cleans up its own
    row in a ``finally``."""
    with SessionLocal() as db:
        db.execute(text("TRUNCATE chunks, documents, query_log, steering_notes"))
        db.commit()
    if not seed:
        return None
    return _run_in_thread(_import_fixtures(mock_port))


def _seed_summary_doc() -> None:
    """One markdown document carrying a stored summary — the viewer
    fixture the phase-100 suite opens in BOTH the same-page modal and
    the standalone document page (the test_document_viewer.py
    XSS-fixture pattern: a direct row insert, the viewer is
    database-only)."""
    with SessionLocal() as db:
        db.add(
            Document(
                source=FIXTURE_SOURCE,
                path=FIXTURE_PATH,
                full_path="/tmp/wide-column-fixture.md",
                title=FIXTURE_TITLE,
                content=(
                    "# Wide Column Fixture\n\n"
                    "Phase-100 width pin: a markdown document with a "
                    "summary, opened in the same-page modal and the "
                    "standalone document page."
                ),
                summary="A phase-100 fixture summary for the width pin.",
                content_hash="w" * 64,
                indexed_at=datetime.now(UTC),
            )
        )
        db.commit()


# ---------------------------------------------------------------------------
# Measurement + chat-turn helpers
# ---------------------------------------------------------------------------


def _drill(page: Page, *names: str) -> None:
    """Phase 97: the catalog is the drill-down tree — click through the
    source/folder rows (exact name match, one per name) to the level
    that holds the asserted file."""
    for name in names:
        page.click(f'#folders-tbody a.folder-link:text-is("{name}")')


def _box_width(page: Page, selector: str, label: str) -> float:
    """The element's bounding-box width (the measured rendered width,
    not the computed style) — None means the element is not rendered,
    which is a test error, not a measurement."""
    box = page.locator(selector).first.bounding_box()
    assert box is not None, f"{selector} not rendered ({label})"
    return box["width"]


def _assert_width(page: Page, selector: str, expected_px: int, label: str) -> None:
    """The element's bounding-box width is ``expected_px`` ±4px (task
    spec) — the measured rendered width, not the computed style."""
    width = _box_width(page, selector, label)
    assert abs(width - expected_px) <= TOL_PX, (
        f"{label}: {selector} is {width:.1f}px, want {expected_px}px ±{TOL_PX}px"
    )


def _assert_centered(page: Page, selector: str, viewport_w: int, label: str) -> None:
    """margin-inline: auto — the column center is within ±2% of the
    viewport center (the test_responsive_polish.py assertion style)."""
    box = page.locator(selector).first.bounding_box()
    assert box is not None, f"{selector} not rendered ({label})"
    center = box["x"] + box["width"] / 2
    assert abs(center - viewport_w / 2) <= 0.02 * viewport_w, (
        f"{label}: {selector} center {center:.1f}px is not within ±2% of "
        f"the {viewport_w}px viewport center"
    )


def _doc_overflow(page: Page) -> tuple[int, int]:
    """(scrollWidth, clientWidth) of the documentElement."""
    return page.evaluate(
        "() => [document.documentElement.scrollWidth, document.documentElement.clientWidth]"
    )  # pyright: ignore[reportReturnType]


def _assert_no_doc_overflow(page: Page, label: str) -> None:
    scroll, client = _doc_overflow(page)
    assert scroll <= client, f"horizontal overflow at {label}: {scroll} > {client}"


def _ask(page: Page, question: str) -> None:
    """Send one turn and wait until the grounded answer has fully
    landed (the ``done`` event restored the Send button)."""
    page.fill("#message-input", question)
    page.click("#send-btn")
    expect(page.locator(".msg.user .bubble").last).to_contain_text(question)
    expect(page.locator(".msg.brain .bubble").last).to_contain_text(
        MOCK_ANSWER_MARKER, timeout=30_000
    )
    expect(page.locator("#send-btn")).to_be_enabled()
    expect(page.locator("#send-label")).to_have_text("Send")


def _admin_cookies(page: Page) -> dict[str, str]:
    """The signed session cookies the browser holds after a form login."""
    return {
        c["name"]: c["value"]
        for c in page.context.cookies()
        if "name" in c and "value" in c
    }


def _auto_title(question: str) -> str:
    """The phase-50 auto-title convention: the first question,
    whitespace-collapsed, capped at 120 chars."""
    return " ".join(question.split())[:120]


def _chats(app_url: str, cookies: dict[str, str]) -> list[dict[str, Any]]:
    r = httpx.get(f"{app_url}/api/chats", timeout=10, cookies=cookies)
    assert r.status_code == 200
    return r.json()["chats"]


def _wait_saved_row(
    app_url: str,
    cookies: dict[str, str],
    title: str,
    messages: int = 2,
) -> dict[str, Any]:
    """Wait for the auto-saved row (phase 55: auto-saves are SILENT —
    poll the admin list until the row with the auto-title appears with
    the expected message count)."""
    deadline = time.monotonic() + 15
    last: dict[str, Any] | None = None
    while time.monotonic() < deadline:
        last = next(
            (c for c in _chats(app_url, cookies) if c["title"] == title), None
        )
        if last is not None and last["message_count"] >= messages:
            return last
        time.sleep(0.2)
    raise AssertionError(f"no auto-saved row for {title!r} (last: {last!r})")


def _delete_chat(app_url: str, cookies: dict[str, str], chat_id: str) -> None:
    """Best-effort row cleanup (a 404 — already deleted — is fine)."""
    httpx.delete(f"{app_url}/api/chats/{chat_id}", timeout=10, cookies=cookies)


def _measure_shells(
    browser: Browser, app_url: str, viewport: ViewportSize
) -> dict[str, float]:
    """One signed-in page at ``viewport``; measure the bounding-box
    width of every shell under test after its view is shown:

    * ``.chat-shell`` on ``/`` (the chat view — the div IS
      ``.container.chat-shell``);
    * ``.tuning-shell`` on ``/tuning.html``, ``.theme-shell`` on
      ``/theme.html``, and the RAG page's ``.sources-shell`` on
      ``/sources.html`` (admin deep-links — A11's one shell document).
    """
    page = browser.new_page(viewport=viewport)
    widths: dict[str, float] = {}
    try:
        login(page, app_url, next="/")
        page.locator(".chat-shell").wait_for(state="visible", timeout=10_000)
        widths[".chat-shell"] = _box_width(page, ".chat-shell", "chat")
        for path, selector in (
            ("/tuning.html", ".tuning-shell"),
            ("/theme.html", ".theme-shell"),
            ("/sources.html", ".sources-shell"),
        ):
            page.goto(app_url + path)
            page.locator(selector).wait_for(state="visible", timeout=10_000)
            widths[selector] = _box_width(page, selector, path)
    finally:
        page.close()
    return widths


# ---------------------------------------------------------------------------
# 1. The core pin: chat == tuning == theme == RAG page (±4px), at both
#    proof viewports; each ≈1152px (the 72rem container) at 1920
# ---------------------------------------------------------------------------


def test_all_columns_match_the_rag_page(
    browser: Browser, app_url: str, db_ready: None
) -> None:
    """The owner's "match the width of the RAG page" as ONE assertion:
    at 1280×800 the four shells are all EQUAL (±4px); at 1920×1080
    they are still equal to each other and each measures ≈1152px
    (72rem at the 16px root, ±4px — the box includes the container's
    2×1.25rem padding, border-box)."""
    # --- 1280×800 (just above the container cap — the owner's report) ---
    widths = _measure_shells(browser, app_url, VIEWPORT_1280)
    ref_selector, ref = next(iter(widths.items()))
    for selector, width in widths.items():
        assert abs(width - ref) <= TOL_PX, (
            f"@1280px {selector} is {width:.1f}px but {ref_selector} is "
            f"{ref:.1f}px — the columns must match the RAG page (±{TOL_PX}px)"
        )

    # --- 1920×1080: equal AND each the 72rem container (≈1152px) ------
    widths = _measure_shells(browser, app_url, VIEWPORT_1920)
    ref_selector, ref = next(iter(widths.items()))
    for selector, width in widths.items():
        assert abs(width - ref) <= TOL_PX, (
            f"@1920px {selector} is {width:.1f}px but {ref_selector} is "
            f"{ref:.1f}px — the columns must match the RAG page (±{TOL_PX}px)"
        )
        assert abs(width - CONTAINER_PX) <= TOL_PX, (
            f"@1920px {selector} is {width:.1f}px, want "
            f"{CONTAINER_PX}px (the 72rem container) ±{TOL_PX}px"
        )


# ---------------------------------------------------------------------------
# 2. The token's consumers at 1920×1080: the modal (unchanged, D2), the
#    shared page, and the standalone document page
# ---------------------------------------------------------------------------


def test_reader_columns_wide(
    browser: Browser, app_url: str, mock_llm: int, db_ready: None
) -> None:
    """At 1920×1080: the same-page document MODAL is untouched (D2 —
    the panel is still ~1100px and IT binds the ``.doc-md`` inside,
    ~1058px, not 1152); ``/shared/<token>``'s ``.shared-shell`` is
    ≈1152px; the standalone ``document.html`` page's ``.doc-md`` is
    ≈1112px (the 72rem container's inner content)."""
    _reset_db(mock_llm, seed=True)
    _seed_summary_doc()

    page = browser.new_page(viewport=VIEWPORT_1920)
    try:
        # (a) the same-page modal — the 1100px panel stays its effective
        # ceiling (D2: pin the PANEL, not the 1152 the column would be).
        login(page, app_url, next="/sources.html")
        page.locator("#folders-tbody .folder-link").first.wait_for(
            state="visible", timeout=15_000
        )
        _drill(page, FIXTURE_SOURCE, "notes")
        row = page.locator("#docs-tbody tr", has_text="wide-column-fixture.md")
        expect(row).to_have_count(1)
        row.locator("td:nth-child(2) a.doc-link").click()
        expect(page.locator(".doc-modal")).to_be_visible()
        expect(page.locator("#doc-modal-title")).to_have_text(FIXTURE_TITLE)
        _assert_width(page, "#doc-modal-panel", MODAL_PANEL_PX, "modal panel @ 1920px")
        _assert_width(
            page,
            "#doc-modal-content .doc-md",
            DOC_MD_MODAL_PX,
            "modal .doc-md @ 1920px",
        )

        # (b) the standalone document page: the 72rem container's inner
        # content (1152 − 2×1.25rem gutters).
        page.goto(app_url + FIXTURE_DOC_URL)
        expect(page.locator("#doc-title")).to_have_text(FIXTURE_TITLE, timeout=15_000)
        expect(page.locator("#doc-content .doc-md")).to_be_visible(timeout=15_000)
        _assert_width(
            page,
            "#doc-content .doc-md",
            DOC_MD_STANDALONE_PX,
            "standalone .doc-md @ 1920px",
        )

        # (c) the shared page: .shared-shell at the full 72rem container.
        page.goto(app_url + "/")
        q = "How is my Kubernetes cluster set up? (wide-column)"
        _ask(page, q)
        cookies = _admin_cookies(page)
        saved_row = _wait_saved_row(app_url, cookies, _auto_title(q))
        chat_id: str = saved_row["id"]
        anon_ctx = None
        try:
            # Public since phase 55 — the share endpoint takes no session.
            r = httpx.post(f"{app_url}/api/chats/{chat_id}/share", timeout=10)
            assert r.status_code == 200
            share_url = r.json()["share_url"]
            assert SHARE_URL_RE.fullmatch(share_url), f"bad share_url shape: {share_url}"

            anon_ctx = browser.new_context(viewport=VIEWPORT_1920)
            anon = anon_ctx.new_page()
            anon.set_default_timeout(30_000)
            anon.goto(app_url + share_url)
            expect(anon.locator("#shared-title")).to_have_text(
                _auto_title(q), timeout=15_000
            )
            expect(anon.locator(".msg.brain .bubble")).to_contain_text(
                MOCK_ANSWER_MARKER, timeout=30_000
            )
            _assert_width(anon, ".shared-shell", CONTAINER_PX, "shared @ 1920px")
            _assert_centered(anon, ".shared-shell", 1920, "shared @ 1920px")
        finally:
            if anon_ctx is not None:
                anon_ctx.close()
            _delete_chat(app_url, cookies, chat_id)
    finally:
        page.close()


# ---------------------------------------------------------------------------
# 3. Below the container cap: full-width as today — 360px overflow-free,
#    900px chat == tuning == theme (the cap never bound below 72rem)
# ---------------------------------------------------------------------------


def test_narrow_unchanged(
    browser: Browser, app_url: str, db_ready: None
) -> None:
    """The mobile/tablet layouts are UNCHANGED (D3): at 360×800 no
    horizontal overflow and ``.chat-shell`` is the viewport width
    (full-bleed — the shell IS its .container, so the mobile gutters sit
    in its padding, inside the measured box); at 900×600 the
    chat/tuning/theme shells are ALL 900px wide, equal to each other
    (the cap never bound below 72rem anyway)."""
    phone = browser.new_page(viewport={"width": 360, "height": 800})
    try:
        login(phone, app_url, next="/")
        phone.locator(".chat-shell").wait_for(state="visible", timeout=10_000)
        _assert_no_doc_overflow(phone, "chat @ 360px")
        _assert_width(phone, ".chat-shell", 360, "chat @ 360px")
    finally:
        phone.close()

    tablet = browser.new_page(viewport={"width": 900, "height": 600})
    try:
        login(tablet, app_url, next="/")
        tablet.locator(".chat-shell").wait_for(state="visible", timeout=10_000)
        _assert_no_doc_overflow(tablet, "chat @ 900px")
        widths = {".chat-shell": _box_width(tablet, ".chat-shell", "chat @ 900px")}
        for path, selector in (
            ("/tuning.html", ".tuning-shell"),
            ("/theme.html", ".theme-shell"),
        ):
            tablet.goto(app_url + path)
            tablet.locator(selector).wait_for(state="visible", timeout=10_000)
            widths[selector] = _box_width(tablet, selector, f"{path} @ 900px")
        ref_selector, ref = next(iter(widths.items()))
        for selector, width in widths.items():
            assert abs(width - ref) <= TOL_PX, (
                f"@900px {selector} is {width:.1f}px but {ref_selector} is "
                f"{ref:.1f}px — the cap must not bind below the container cap"
            )
            assert abs(width - 900) <= TOL_PX, (
                f"@900px {selector} is {width:.1f}px, want the full 900px "
                f"viewport width ±{TOL_PX}px"
            )
    finally:
        tablet.close()