"""Phase 97 task 06 E2E (Playwright, mock-only): the RAG view's drill-down
catalog tree + the editable folder descriptions.

The dedicated story suite for ``97_kb_tree_catalog`` (owner request,
2026-09-11): the Knowledge base view lists the KB the way the agent's
``ls`` sees it (the phase-94 concept, one end to end) — sources at the
top, then per level the subfolders with their stored descriptions and
the level's files — and the owner edits (or clears) any directory's
description with the phase-57 inline affordance. Everything is pinned
against the real app + the deterministic mock.

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

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

KB fixture — a host temp-dir tree (``tmp_path_factory``; the app runs on
the same host) with TWO local sources registered through the
authenticated API, then the real in-process ``POST /api/sync`` pipeline
(the ``test_local_directory_sources.py`` / phase-94 registration +
real-Sync pattern; no git anywhere):

* ``alpha/`` — ``root-note.md`` at the source root, ``one/`` (2 docs),
  ``two/`` (2 docs);
* ``beta/`` — ``gamma/`` (2 docs).

Total: 7 documents; alpha counts 5 (root + 2 + 2), beta counts 2. Every
stored description is deterministic: the mock's EXISTING
``FOLDER_SUMMARY_MODE`` branch (phase 94 — no mock changes needed)
stores, per ≥ 2-doc folder, the canned one-liner naming the folder,
``Fixture folder summary for <source>[/<folder>].`` — the ``synced_kb``
module fixture pins those exact rows (all with
``manually_edited = false``) after the sync, and the tests assert on
that exact text.

MOCK-ONLY suite: ``E2E_REAL_LLM=1`` is not supported — the real
``lite`` does whatever it does with the folder prompts, while this
story's assertions key on the CANNED summaries (the phase-94
convention): the stored rows are a pure function of the request, so the
drill, the edit/clear, and the keep-through-sync observables are
byte-exact only against the mock.

The view is admin-only (phase 16): the admin flows drive the REAL form
login (``e2e.auth_helpers.login`` → ``/sources.html``); the anonymous
test uses a fresh context and asserts the sign-in gate + zero catalog
fetches.

Test → observable mapping (Playwright Mapping Rule):
1. ``test_top_level_lists_sources_with_descriptions`` — the source rows:
   ``alpha`` (5) + ``beta`` (2) in registry order with the canned
   source-root descriptions (the top-level rows ARE the sources — the
   ``ls()`` equivalence); the top-level file table is HIDDEN (files are
   per-source); the stat cards read 7 documents + the computed chunks
   total (the tree walk = the former flat walk).
2. ``test_drill_into_source`` — click the ``alpha`` row → breadcrumb
   ``alpha`` (the ``aria-current`` segment); the level block shows
   alpha's root description (the canned text, title = the source name);
   the folder rows ``one`` / ``two`` each with count 2 + their canned
   summaries; the file row ``root-note.md`` (Source column, title,
   chunks column) in the level's file table.
3. ``test_drill_into_folder`` — drill to ``alpha`` → ``two`` →
   breadcrumb ``alpha`` → ``two``; the level block shows ``two``'s
   description (title = the full source-relative path); the file rows
   ``two-a`` / ``two-b`` (titles, the Source column ``alpha``);
   ``#folders-wrap`` hidden (no subfolders); the breadcrumb link on
   ``alpha`` goes back up to the source level.
4. ``test_edit_folder_description`` — on the ``alpha`` level, Edit on
   the ``one/`` ROW (pinned: the row surface — the level-block surface
   is test 6's) → the textarea prefilled with the canned text → set the
   new text → Save → the new text renders in the row + status
   "Description updated."; a SQL assert (the ``SessionLocal`` house
   pattern) on ``folder_summaries``: the row's ``summary`` is the new
   text AND ``manually_edited`` is true.
5. ``test_clear_folder_description`` — an empty save → the text is gone
   (the row cell emptied — the always-present Edit button stays) +
   status "Description cleared."; the SQL assert: no row for the folder
   (the next KB-changing sync regenerates an AI description — the
   reset path).
6. ``test_manual_description_survives_a_changed_sync`` — the
   LEVEL-BLOCK edit on the ``beta`` source root (the static
   ``#kb-level-edit`` button, ``folder_path ""``); a new file is added
   to the fixture dir; the real in-process sync (the mock regenerates
   the OTHER folders' summaries) → the catalog re-fetch renders the
   edited description UNCHANGED (the SQL row keeps the manual text +
   the flag — the ``kept_manual`` path, E2E-pinned) while the untouched
   folders show the canned regenerated text (flag back to false) and
   the new document lands in the tree (the ``one`` folder counts 3).
7. ``test_reload_falls_back_to_top_level`` — drill to ``alpha/two``;
   delete ``two/``'s documents + chunks directly (the house DB
   pattern); re-show the RAG view (the nav link re-click — the
   ``bor:view-refresh`` trigger) → the breadcrumb is hidden and the top
   level renders (the never-stale contract, PLAN §7.4).
8. ``test_anonymous_sees_the_gate`` — the RAG view for an anonymous
   visitor: the sign-in gate visible, no stat cards, no folders/file
   table, no Edit affordance, and NO ``/api/docs*`` request (the
   phase-16 soft rule — asserted via the request log, the
   ``test_admin_auth.py`` pattern).
"""
from __future__ import annotations

import json
import os
import subprocess
import sys
import time
from collections.abc import Iterator
from pathlib import Path
from typing import Any

import httpx
import pytest
from playwright.sync_api import Page, expect
from sqlalchemy import select, text

from app.config import Settings as _Settings
from app.db import SessionLocal
from app.models import FolderSummary
from e2e.auth_helpers import login
from e2e.conftest import (
    ADMIN_PASSWORD,
    SESSION_SECRET,
    USE_REAL_LLM,
    _wait_http,
)

REPO = Path(__file__).resolve().parents[2]

# Phase 79 (task 04, full inventory): the conftest session app owns its
# port in a combined run — this module app binds its own port instead
# (a same-port second uvicorn dies on bind and would drive the wrong
# server). Env-overridable.
APP_PORT = int(os.environ.get("E2E_APP_PORT_KBTREE", "8139"))
APP_URL = f"http://127.0.0.1:{APP_PORT}"

# --------------------------------------------------------------------------
# Fixture constants (deterministic, token-controlled)
# --------------------------------------------------------------------------

ALPHA = "alpha"
BETA = "beta"

ROOT_NOTE = "root-note.md"
ONE_A = "one/one-a.md"
ONE_B = "one/one-b.md"
ONE_C = "one/one-c.md"  # test 6's KB-changing addition
TWO_A = "two/two-a.md"
TWO_B = "two/two-b.md"
GAMMA_A = "gamma/gamma-a.md"
GAMMA_B = "gamma/gamma-b.md"

ALPHA_COUNT = 5  # 1 root note + 2 one/ + 2 two/
BETA_COUNT = 2
TOTAL_DOCS = ALPHA_COUNT + BETA_COUNT

#: The sync-time folder descriptions the mock's canned
#: ``FOLDER_SUMMARY_MODE`` branch stores (the phase-94 byte-stable
#: template — the one-liner names the folder), in ``(source,
#: folder_path)`` order: one row per ≥ 2-doc folder (the
#: recursive-subtree rule) — the ``""`` rows are the source roots.
SUMMARY_FOR = "Fixture folder summary for {}."
ALPHA_ROOT_SUM = SUMMARY_FOR.format(ALPHA)
ONE_SUM = SUMMARY_FOR.format(f"{ALPHA}/one")
TWO_SUM = SUMMARY_FOR.format(f"{ALPHA}/two")
BETA_ROOT_SUM = SUMMARY_FOR.format(BETA)
GAMMA_SUM = SUMMARY_FOR.format(f"{BETA}/gamma")

EXPECTED_SUMMARIES: list[tuple[str, str, str]] = [
    (ALPHA, "", ALPHA_ROOT_SUM),
    (ALPHA, "one", ONE_SUM),
    (ALPHA, "two", TWO_SUM),
    (BETA, "", BETA_ROOT_SUM),
    (BETA, "gamma", GAMMA_SUM),
]
assert [
    (source, folder) for source, folder, _s in EXPECTED_SUMMARIES
] == sorted((source, folder) for source, folder, _s in EXPECTED_SUMMARIES)

#: The hand-edited descriptions (tests 4 and 6) — distinctive sentences
#: no part of the fixture or the canned template contains, so the
#: round-trip assertions can never pass against the old text.
NEW_ALPHA_ONE = (
    "Owner override: alpha/one holds the one-a and one-b fixture notes — "
    "the drill catalog's first hand-written description. (RESE-KBTREE-01)"
)
NEW_BETA_ROOT = (
    "Owner override: beta is the second fixture source — gamma only. "
    "(RESE-KBTREE-02)"
)


def _md(title: str, body: str) -> str:
    return f"# {title}\n\n{body}\n"


# --------------------------------------------------------------------------
# Fixtures
# --------------------------------------------------------------------------


@pytest.fixture(scope="module")
def kb_tree_dirs(tmp_path_factory: pytest.TempPathFactory) -> tuple[Path, Path]:
    """The two-source temp tree (see the module docstring): the app
    server runs on the same host, so the paths are visible to it. The
    directory NAMES are the source names (``kind=local`` → the
    directory's basename, phase 38)."""
    root = tmp_path_factory.mktemp("bor_kb_tree")
    alpha = root / ALPHA
    beta = root / BETA
    (alpha / "one").mkdir(parents=True)
    (alpha / "two").mkdir(parents=True)
    (beta / "gamma").mkdir(parents=True)

    (alpha / ROOT_NOTE).write_text(
        _md(
            "Alpha Root Note",
            "This file sits directly under the alpha source, not in any "
            "folder.",
        ),
        encoding="utf-8",
    )
    (alpha / ONE_A).write_text(
        _md(
            "Alpha One A",
            "Alpha one fixture note A: covers topic A of the alpha "
            "source tree.",
        ),
        encoding="utf-8",
    )
    (alpha / ONE_B).write_text(
        _md(
            "Alpha One B",
            "Alpha one fixture note B: covers topic B of the alpha "
            "source tree.",
        ),
        encoding="utf-8",
    )
    (alpha / TWO_A).write_text(
        _md(
            "Alpha Two A",
            "Alpha two fixture note A: covers topic A of the alpha "
            "source tree.",
        ),
        encoding="utf-8",
    )
    (alpha / TWO_B).write_text(
        _md(
            "Alpha Two B",
            "Alpha two fixture note B: covers topic B of the alpha "
            "source tree.",
        ),
        encoding="utf-8",
    )
    (beta / GAMMA_A).write_text(
        _md(
            "Beta Gamma A",
            "Beta gamma fixture note A: covers topic A of the beta "
            "source tree.",
        ),
        encoding="utf-8",
    )
    (beta / GAMMA_B).write_text(
        _md(
            "Beta Gamma B",
            "Beta gamma fixture note B: covers topic B of the beta "
            "source tree.",
        ),
        encoding="utf-8",
    )
    assert (alpha / TWO_A).is_file() and (beta / GAMMA_B).is_file()
    return alpha, beta


@pytest.fixture(scope="module")
def app_server(mock_llm: int, kb_tree_dirs: tuple[Path, Path]) -> Iterator[str]:
    """The real app under test — per-module app (the conftest pattern,
    cf. ``test_local_directory_sources.py`` / ``test_ls_tree_drilldown.
    py``): NO ``BOR_GIT_SOURCES`` (the env fallback is git-only — the
    sources here are DB-registered local directories), the mock LLM, the
    mock-calibrated threshold, and the leak-guarded code defaults. The
    session app is never started in this isolated run, so no port clash.
    ``kb_tree_dirs`` is a dependency only for the fixture ordering (the
    temp tree exists before the app boots — the sync reads it)."""
    env = dict(os.environ)
    env.pop("DEBUGPY", None)
    env["BOR_ENVIRONMENT"] = "e2e"
    env["BOR_STATIC_DIR"] = str(REPO / "frontend")
    env["BOR_LLM_BASE_URL"] = (
        "https://aipi.reeseapps.com/v1"
        if USE_REAL_LLM
        else f"http://127.0.0.1:{mock_llm}/v1"
    )
    # Mock-calibrated threshold (conftest pattern): this suite never
    # asks the chat model anything — the gate is never on a path.
    env["BOR_RELEVANCE_THRESHOLD"] = "0.30"
    # Phase 67: instant retry waits + the code-default budget (the
    # conftest leak-guard pattern).
    env["BOR_LLM_RETRY_DELAY"] = "0"
    env["BOR_LLM_RETRIES"] = str(_Settings.model_fields["llm_retries"].default)
    env.setdefault(
        "BOR_DATABASE_URL",
        "postgresql+psycopg://reese:reese@localhost:5432/brain_of_reese",
    )
    # Phase 16: admin auth must be set or create_app() refuses to boot.
    env["BOR_ADMIN_PASSWORD"] = ADMIN_PASSWORD
    env["BOR_SESSION_SECRET"] = SESSION_SECRET
    # The repo's .env file carries the owner's BOR_GIT_SOURCES (the app
    # reads it from cwd) — override it with an EMPTY value (the env var
    # beats the .env file): the registry must hold EXACTLY the two
    # local directories this suite registers (a leftover env git list
    # would pollute the top-level rows the whole story asserts on).
    env["BOR_GIT_SOURCES"] = ""
    # Leak guards (conftest pattern): an operator's local (gitignored)
    # .env cannot leak corpus-specific settings into the app under test.
    env["BOR_DOCS_REPO"] = ""
    env["BOR_SUGGESTIONS"] = json.dumps(
        _Settings.model_fields["suggestions"].default
    )
    env["BOR_INPUT_PLACEHOLDER"] = _Settings.model_fields["input_placeholder"].default
    env["BOR_FOOTER_TEXT"] = _Settings.model_fields["footer_text"].default
    proc = subprocess.Popen(
        [sys.executable, "-m", "uvicorn", "app.main:app",
         "--host", "127.0.0.1", "--port", str(APP_PORT), "--log-level", "warning"],
        cwd=REPO,
        env=env,
    )
    try:
        _wait_http(f"{APP_URL}/api/health")
        yield APP_URL
    finally:
        proc.terminate()
        try:
            proc.wait(timeout=10)
        except subprocess.TimeoutExpired:
            proc.kill()


@pytest.fixture(scope="module")
def app_url(app_server: str) -> str:
    return app_server


def _truncate_all() -> None:
    """Fresh registry + KB (the E2E isolation pattern): the E2E suites
    share one Postgres, so a leftover git_sources row would pollute the
    top-level rows and a leftover document would show up in the level
    file tables and the stat cards the suite asserts on exactly."""
    with SessionLocal() as db:
        db.execute(
            text(
                "TRUNCATE chunks, documents, query_log, steering_notes, "
                "kb_overview, git_sources, folder_summaries"
            )
        )
        db.commit()  # without the commit the TRUNCATE rolls back (the house pattern)


def _wait_sync_done_http(client: httpx.Client, timeout_s: float = 180.0) -> dict[str, Any]:
    """Poll the (cookie-authenticated) status endpoint until the run
    reaches a terminal state (the test_local_directory_sources pattern,
    over plain httpx)."""
    deadline = time.monotonic() + timeout_s
    body: dict[str, Any] = {}
    while time.monotonic() < deadline:
        r = client.get("/api/sync/status")
        assert r.status_code == 200, r.text
        body = r.json()
        if body["state"] in ("success", "failed"):
            return body
        time.sleep(0.5)
    raise AssertionError(f"sync did not reach a terminal state: {body}")


@pytest.fixture(scope="module")
def synced_kb(app_server: str, kb_tree_dirs: tuple[Path, Path]) -> None:
    """The story's precondition: the folder-structured KB synced under
    the deterministic mock.

    Registers the two temp directories through the authenticated API
    (the ``test_local_directory_sources.py`` pattern — ``alpha`` FIRST,
    committed separately, so the registry order — ``(added_at, id)`` —
    lists alpha before beta, the top-level row order the suite
    asserts), runs the REAL in-process sync (``POST /api/sync`` —
    walk → chunk → embed → overview → folder summaries → version
    bump), and pins the stored folder descriptions: the mock's canned
    ``FOLDER_SUMMARY_MODE`` branch (phase 94) makes the sync store one
    deterministic row per ≥ 2-doc folder — the tests assert on that
    exact text (and on the phase-97 ``manually_edited`` flag: every
    stored row starts out AI-written).
    """
    alpha, beta = kb_tree_dirs
    _truncate_all()
    with httpx.Client(base_url=app_server, timeout=30.0) as client:
        r = client.post("/api/login", json={"password": ADMIN_PASSWORD})
        assert r.status_code == 204, r.text
        r = client.post(
            "/api/git-sources", json={"kind": "local", "path": str(alpha)}
        )
        assert r.status_code == 201, r.text
        time.sleep(0.05)  # distinct added_at: alpha before beta (registry order)
        r = client.post(
            "/api/git-sources", json={"kind": "local", "path": str(beta)}
        )
        assert r.status_code == 201, r.text
        r = client.post("/api/sync")
        assert r.status_code == 202, r.text
        body = _wait_sync_done_http(client)
    assert body["state"] == "success", body
    detail = body["detail"]
    assert detail["added"] == TOTAL_DOCS, detail
    assert detail["pruned"] == 0, detail
    assert detail["overview"] is True, detail
    # The change-gated folder descriptions (phase 94) landed: one row
    # per ≥ 2-doc folder, the mock's byte-stable text — and every row
    # AI-written (the ``manually_edited`` flag starts false).
    with SessionLocal() as db:
        rows = db.execute(
            select(
                FolderSummary.source,
                FolderSummary.folder_path,
                FolderSummary.summary,
                FolderSummary.manually_edited,
            ).order_by(FolderSummary.source, FolderSummary.folder_path)
        ).all()
    assert [
        (source, folder, summary, False)
        for source, folder, summary in EXPECTED_SUMMARIES
    ] == [(s, f, t, m) for s, f, t, m in rows], rows


# --------------------------------------------------------------------------
# Page + DB helpers
# --------------------------------------------------------------------------


def _kb_totals() -> tuple[int, int]:
    """The KB-wide ``(documents, chunks)`` totals for the two sources,
    straight from the DB — the values the stat cards' tree walk must
    render (the former flat /api/docs walk, one level deeper)."""
    with SessionLocal() as db:
        docs = db.scalar(
            text("SELECT count(*) FROM documents WHERE source IN (:a, :b)"),
            {"a": ALPHA, "b": BETA},
        )
        chunks = db.scalar(
            text(
                "SELECT count(*) FROM chunks c JOIN documents d "
                "ON c.document_id = d.id WHERE d.source IN (:a, :b)"
            ),
            {"a": ALPHA, "b": BETA},
        )
    return int(docs), int(chunks)


def _doc_chunks(source: str, path: str) -> int:
    """One document's chunk count (the Chunks column value the file
    row must render — the count ``GET /api/docs`` returns for it)."""
    with SessionLocal() as db:
        n = db.scalar(
            text(
                "SELECT count(*) FROM chunks c JOIN documents d "
                "ON c.document_id = d.id WHERE d.source = :s AND d.path = :p"
            ),
            {"s": source, "p": path},
        )
    return int(n)


def _folder_row(source: str, folder: str) -> tuple[str, bool] | None:
    """The stored ``(source, folder)`` description as
    ``(summary, manually_edited)`` (``None`` when no row exists) —
    read back through a fresh session (the ``SessionLocal`` house
    pattern)."""
    with SessionLocal() as db:
        row = db.scalar(
            select(FolderSummary).where(
                FolderSummary.source == source,
                FolderSummary.folder_path == folder,
            )
        )
        return (row.summary, row.manually_edited) if row is not None else None


def _run_sync(app_url: str) -> dict[str, Any]:
    """One admin sync through the API — the cookie-authenticated
    ``POST /api/sync`` + the status poll (the ``synced_kb`` pattern,
    for test 6's mid-suite KB-changing sync)."""
    with httpx.Client(base_url=app_url, timeout=30.0) as client:
        r = client.post("/api/login", json={"password": ADMIN_PASSWORD})
        assert r.status_code == 204, r.text
        r = client.post("/api/sync")
        assert r.status_code == 202, r.text
        return _wait_sync_done_http(client)


def _wait_top_level(page: Page) -> None:
    """The admin boot has rendered the top level: the two source rows
    are in the folders table (the tree's single fetch settled) and the
    top-level file table is empty (files are per-source — always hidden
    at the top)."""
    expect(page.locator("#folders-tbody tr")).to_have_count(2, timeout=30_000)
    expect(page.locator("#docs-tbody tr")).to_have_count(0)


def _drill(page: Page, *names: str) -> None:
    """Drill one level at a time (client-side — no fetch, no URL
    change): each name is the EXACT text of the source/folder link at
    the current level (the row builders' link text: the source name,
    or the folder's last path segment)."""
    for name in names:
        page.click(f'#folders-tbody a.folder-link:text-is("{name}")')


def _expect_level(page: Page, title: str, summary: str) -> None:
    """The level block shows the current directory's stored
    description: the full source-relative path as the title, the
    description as the text."""
    expect(page.locator("#kb-level")).to_be_visible()
    expect(page.locator("#kb-level-title")).to_have_text(title)
    expect(page.locator("#kb-level-summary")).to_have_text(summary)


# --------------------------------------------------------------------------
# 1. The top level: the source rows (the ls() equivalence) + stat cards
# --------------------------------------------------------------------------


def test_top_level_lists_sources_with_descriptions(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)
    docs, chunks = _kb_totals()
    assert docs == TOTAL_DOCS  # the fixture's precondition (7 documents)

    login(page, app_url)  # → /sources.html (the RAG view)
    _wait_top_level(page)

    # The source rows: registry order (alpha registered first), the
    # recursive count, the stored (source, "") description — the
    # top-level rows ARE the sources (the ls() equivalence: name,
    # count, description).
    rows = page.locator("#folders-tbody tr")
    expect(rows.nth(0).locator("a.folder-link")).to_have_text(ALPHA)
    expect(rows.nth(0).locator("td:nth-child(2)")).to_have_text(str(ALPHA_COUNT))
    expect(rows.nth(0).locator("td:nth-child(4) span")).to_have_text(ALPHA_ROOT_SUM)
    expect(rows.nth(1).locator("a.folder-link")).to_have_text(BETA)
    expect(rows.nth(1).locator("td:nth-child(2)")).to_have_text(str(BETA_COUNT))
    expect(rows.nth(1).locator("td:nth-child(4) span")).to_have_text(BETA_ROOT_SUM)
    # The edit affordance is ALWAYS present (a description can be
    # CREATED where none is stored) — the row surface, one per row.
    expect(page.locator("#folders-tbody .kb-summary-edit")).to_have_count(2)

    # The top level carries no breadcrumb and no level block; the
    # empty state is off (a source IS listed).
    expect(page.locator("#kb-crumb")).to_be_hidden()
    expect(page.locator("#kb-level")).to_be_hidden()
    expect(page.locator("#sources-empty")).to_be_hidden()

    # The file table is HIDDEN at the top level (files are seen per
    # source, as with ls(source) — the ls() equivalence).
    expect(page.locator("#docs-table")).to_be_hidden()

    # The stat cards: the KB-wide walk of the WHOLE tree — identical
    # values to the former flat /api/docs walk.
    expect(page.locator("#stat-docs")).to_have_text(str(TOTAL_DOCS))
    expect(page.locator("#stat-chunks")).to_have_text(str(chunks))
    expect(page.locator("#stat-last")).not_to_have_text("–")


# --------------------------------------------------------------------------
# 2. Drill into a source: breadcrumb, level block, folder rows, files
# --------------------------------------------------------------------------


def test_drill_into_source(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)
    root_chunks = _doc_chunks(ALPHA, ROOT_NOTE)

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, ALPHA)

    # Breadcrumb: the top-level link + the current source segment.
    expect(page.locator("#kb-crumb")).to_be_visible()
    links = page.locator("#kb-crumb a.kb-crumb-link")
    expect(links).to_have_count(1)
    expect(links.nth(0)).to_have_text("Knowledge base")
    expect(page.locator("#kb-crumb .kb-crumb-current")).to_have_text(ALPHA)
    expect(page.locator("#kb-crumb .kb-crumb-current")).to_have_attribute(
        "aria-current", "page"
    )

    # The level block: the source's stored root description (title =
    # the source name — the source root is folder "") + the level's
    # own Edit button (task 05).
    _expect_level(page, ALPHA, ALPHA_ROOT_SUM)
    expect(page.locator("#kb-level-edit")).to_be_visible()

    # The subfolder rows: path order, the recursive count, the stored
    # (AI) description.
    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(2)
    expect(rows.nth(0).locator("a.folder-link")).to_have_text("one")
    expect(rows.nth(0).locator("td:nth-child(2)")).to_have_text("2")
    expect(rows.nth(0).locator("td:nth-child(4) span")).to_have_text(ONE_SUM)
    expect(rows.nth(1).locator("a.folder-link")).to_have_text("two")
    expect(rows.nth(1).locator("td:nth-child(2)")).to_have_text("2")
    expect(rows.nth(1).locator("td:nth-child(4) span")).to_have_text(TWO_SUM)

    # The level's direct files: root-note.md — the 6-column contract
    # (makeRow): Source | Path | Title | Chunks | Created | Indexed
    # (phase 106, task 08, D8: Created BEFORE Indexed — the cell
    # carries the locale date, the full ISO on its title).
    expect(page.locator("#docs-table")).to_be_visible()
    frows = page.locator("#docs-tbody tr")
    expect(frows).to_have_count(1)
    expect(frows.nth(0).locator("td:nth-child(1)")).to_have_text(ALPHA)
    expect(frows.nth(0).locator("a.doc-link")).to_have_text(ROOT_NOTE)
    expect(frows.nth(0).locator("td:nth-child(3)")).to_have_text("Alpha Root Note")
    expect(frows.nth(0).locator("td:nth-child(4)")).to_have_text(str(root_chunks))
    expect(frows.nth(0).locator("td:nth-child(6)")).not_to_have_text("")


# --------------------------------------------------------------------------
# 3. Drill into a folder: the file level + the breadcrumb going back up
# --------------------------------------------------------------------------


def test_drill_into_folder(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, ALPHA, "two")

    # Breadcrumb: the top-level link + the source link + the current
    # folder segment.
    links = page.locator("#kb-crumb a.kb-crumb-link")
    expect(links).to_have_count(2)
    expect(links.nth(0)).to_have_text("Knowledge base")
    expect(links.nth(1)).to_have_text(ALPHA)
    expect(page.locator("#kb-crumb .kb-crumb-current")).to_have_text("two")

    # The level block: two's stored description, the FULL
    # source-relative path as the title.
    _expect_level(page, f"{ALPHA}/two", TWO_SUM)

    # The file rows: two-a / two-b (path order), the Source column
    # carries the source (the file nodes are source-scoped in the tree
    # — the row object restores the flat shape makeRow reads).
    frows = page.locator("#docs-tbody tr")
    expect(frows).to_have_count(2)
    expect(frows.nth(0).locator("td:nth-child(1)")).to_have_text(ALPHA)
    expect(frows.nth(0).locator("a.doc-link")).to_have_text(TWO_A)
    expect(frows.nth(0).locator("td:nth-child(3)")).to_have_text("Alpha Two A")
    expect(frows.nth(1).locator("td:nth-child(1)")).to_have_text(ALPHA)
    expect(frows.nth(1).locator("a.doc-link")).to_have_text(TWO_B)
    expect(frows.nth(1).locator("td:nth-child(3)")).to_have_text("Alpha Two B")

    # No subfolders under two: the folders table is hidden.
    expect(page.locator("#folders-wrap")).to_be_hidden()

    # The breadcrumb link on the source goes back UP to the source
    # level (client-side — no fetch, no URL change).
    page.click(f'#kb-crumb a.kb-crumb-link:text-is("{ALPHA}")')
    expect(page.locator("#kb-crumb .kb-crumb-current")).to_have_text(ALPHA)
    expect(page.locator("#kb-crumb a.kb-crumb-link")).to_have_count(1)
    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(2)
    expect(rows.nth(0).locator("a.folder-link")).to_have_text("one")
    expect(rows.nth(1).locator("a.folder-link")).to_have_text("two")


# --------------------------------------------------------------------------
# 4. Edit a folder description (the row surface) → manually_edited
# --------------------------------------------------------------------------


def test_edit_folder_description(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, ALPHA)

    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(2)
    row = rows.nth(0)
    expect(row.locator("a.folder-link")).to_have_text("one")

    # Edit → the inline editor: textarea PREFILLED with the stored
    # (canned) text, Save / Cancel, and the role=status live region.
    row.locator(".kb-summary-edit").click()
    editor = page.locator(".kb-summary-editor")
    expect(editor).to_have_count(1)
    expect(editor).to_be_visible()
    expect(editor).to_have_value(ONE_SUM)
    expect(page.locator(".kb-summary-save")).to_be_visible()
    expect(page.locator(".kb-summary-cancel")).to_be_visible()
    status = row.locator(".kb-summary-status")
    expect(status).to_have_attribute("role", "status")
    expect(status).to_have_attribute("aria-live", "polite")

    # Replace the text with the distinctive hand-edit and Save.
    page.fill(".kb-summary-editor", NEW_ALPHA_ONE)
    page.click(".kb-summary-save")

    # The live-region confirmation; the new text renders in the row
    # (the textContent re-render — the canned text is gone); the
    # always-present Edit button is back.
    expect(status).to_have_text("Description updated.")
    expect(row.locator("td:nth-child(4) span")).to_have_text(NEW_ALPHA_ONE)
    expect(row.locator(".kb-summary-edit")).to_be_visible()

    # The server row: the new text AND the manually_edited flag (the
    # task-01 keep/keep-out rules apply from this save on — the
    # sync-time generator must never rewrite or prune the row).
    stored = _folder_row(ALPHA, "one")
    assert stored == (NEW_ALPHA_ONE, True), stored


# --------------------------------------------------------------------------
# 5. An empty save CLEARS — the row is deleted (the reset path)
# --------------------------------------------------------------------------


def test_clear_folder_description(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, ALPHA)

    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(2)
    row = rows.nth(0)
    expect(row.locator("a.folder-link")).to_have_text("one")
    # The row holds a description (the module's canned row — or test
    # 4's manual edit when the tests run in order); the editor opens
    # either way (the button is always present).
    row.locator(".kb-summary-edit").click()
    expect(page.locator(".kb-summary-editor")).to_be_visible()

    # Select-all + delete — clear the prefilled editor — then Save.
    page.fill(".kb-summary-editor", "")
    page.click(".kb-summary-save")

    status = row.locator(".kb-summary-status")
    expect(status).to_have_text("Description cleared.")
    # The text is gone: the cell empties (the always-present Edit
    # button stays — a description can be re-created from the empty
    # cell).
    expect(row.locator("td:nth-child(4) span")).to_have_text("")
    expect(row.locator(".kb-summary-edit")).to_be_visible()

    # The SQL assert: no row for the folder (the next KB-changing
    # sync regenerates an AI description — the reset path).
    assert _folder_row(ALPHA, "one") is None


# --------------------------------------------------------------------------
# 6. The manual description survives a KB-changing sync (kept_manual)
# --------------------------------------------------------------------------


def test_manual_description_survives_a_changed_sync(
    page: Page,
    app_url: str,
    synced_kb: None,
    kb_tree_dirs: tuple[Path, Path],
    db_ready: None,
) -> None:
    page.set_default_timeout(30_000)
    alpha, _beta = kb_tree_dirs

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, BETA)

    # The beta level: the stored root description + the gamma row
    # (both canned — AI-written at the module sync).
    _expect_level(page, BETA, BETA_ROOT_SUM)
    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(1)
    expect(rows.nth(0).locator("a.folder-link")).to_have_text("gamma")
    expect(rows.nth(0).locator("td:nth-child(4) span")).to_have_text(GAMMA_SUM)

    # The LEVEL-BLOCK Edit (the level surface — test 4 pins the row
    # surface): the static #kb-level-edit button, the source root
    # (folder_path ""). The textarea is prefilled with the stored text.
    page.click("#kb-level-edit")
    editor = page.locator(".kb-summary-editor")
    expect(editor).to_have_count(1)
    expect(editor).to_have_value(BETA_ROOT_SUM)
    page.fill(".kb-summary-editor", NEW_BETA_ROOT)
    page.click(".kb-summary-save")
    expect(page.locator("#kb-level .kb-summary-status")).to_have_text(
        "Description updated."
    )
    expect(page.locator("#kb-level-summary")).to_have_text(NEW_BETA_ROOT)

    # The KB-changing sync: a new file lands in alpha/one (the fixture
    # dir — the app runs on the same host), then the real in-process
    # sync (the mock's FOLDER_SUMMARY_MODE branch regenerates the
    # non-manual folders' summaries).
    (alpha / ONE_C).write_text(
        _md(
            "Alpha One C",
            "Alpha one fixture note C: added for the changed-sync test.",
        ),
        encoding="utf-8",
    )
    body = _run_sync(app_url)
    assert body["state"] == "success", body
    assert body["detail"]["added"] == 1, body["detail"]

    # The catalog re-fetch (the nav re-click — the bor:view-refresh
    # trigger, no document load): the current position (the beta root)
    # still exists, so the view stays put and re-renders from the NEW
    # tree — the EDITED description is UNCHANGED (kept_manual: the
    # generator skipped the owner's row, no lite burn on it)…
    page.click("#nav-sources")
    expect(page.locator("#kb-level-summary")).to_have_text(NEW_BETA_ROOT)
    # …while the untouched folder shows the canned REGENERATED text.
    expect(
        page.locator("#folders-tbody tr")
        .nth(0)
        .locator("td:nth-child(4) span")
    ).to_have_text(GAMMA_SUM)

    # The new document landed in the tree: back to the top (the
    # breadcrumb's top-level link), then into alpha — the one folder
    # now counts 3 with its regenerated canned description.
    page.locator("#kb-crumb a.kb-crumb-link").nth(0).click()
    _drill(page, ALPHA)
    one_row = page.locator("#folders-tbody tr").nth(0)
    expect(one_row.locator("a.folder-link")).to_have_text("one")
    expect(one_row.locator("td:nth-child(2)")).to_have_text("3")
    expect(one_row.locator("td:nth-child(4) span")).to_have_text(ONE_SUM)

    # The SQL asserts: the manual row survived (text + flag), the
    # untouched rows were regenerated (the canned text, the flag back
    # to false — the rows are AI-written again).
    assert _folder_row(BETA, "") == (NEW_BETA_ROOT, True)
    assert _folder_row(BETA, "gamma") == (GAMMA_SUM, False)
    assert _folder_row(ALPHA, "one") == (ONE_SUM, False)


# --------------------------------------------------------------------------
# 7. A vanished location resets the view to the top level (never stale)
# --------------------------------------------------------------------------


def test_reload_falls_back_to_top_level(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)

    login(page, app_url)
    _wait_top_level(page)
    _drill(page, ALPHA, "two")
    expect(page.locator("#kb-crumb .kb-crumb-current")).to_have_text("two")

    # The folder vanishes: its documents + chunks deleted directly (the
    # house DB pattern — no sync, no API).
    with SessionLocal() as db:
        db.execute(
            text(
                "DELETE FROM chunks WHERE document_id IN "
                "(SELECT id FROM documents WHERE source = :s AND path LIKE 'two/%')"
            ),
            {"s": ALPHA},
        )
        db.execute(
            text("DELETE FROM documents WHERE source = :s AND path LIKE 'two/%'"),
            {"s": ALPHA},
        )
        db.commit()

    # Re-show the RAG view: the nav-link RE-CLICK is the
    # bor:view-refresh trigger (the router's re-fetch on the mounted
    # view — no document load).
    page.click("#nav-sources")

    # The vanished location resets the view to the top level BEFORE
    # rendering (PLAN §7.4 — no stale breadcrumb, no stale block): the
    # breadcrumb and the level block are hidden, the source rows
    # re-render.
    expect(page.locator("#kb-crumb")).to_be_hidden()
    expect(page.locator("#kb-level")).to_be_hidden()
    rows = page.locator("#folders-tbody tr")
    expect(rows).to_have_count(2)
    expect(rows.nth(0).locator("a.folder-link")).to_have_text(ALPHA)
    expect(rows.nth(1).locator("a.folder-link")).to_have_text(BETA)


# --------------------------------------------------------------------------
# 8. Anonymous: the sign-in gate — and zero catalog fetches
# --------------------------------------------------------------------------


def test_anonymous_sees_the_gate(
    page: Page, app_url: str, synced_kb: None, db_ready: None
) -> None:
    page.set_default_timeout(30_000)

    docs_calls: list[str] = []
    page.on(
        "request",
        lambda r: docs_calls.append(r.url) if "/api/docs" in r.url else None,
    )

    # Fresh context (the function-scoped page fixture — no login).
    page.goto(app_url + "/sources.html")
    gate = page.locator("#sources-gate")
    expect(gate).to_be_visible(timeout=30_000)
    expect(gate).to_contain_text("Sign in to view the full catalog")

    # The catalog surfaces stay hidden (the tree ships hidden and never
    # fills for anonymous)…
    expect(page.locator("#stat-cards")).to_be_hidden()
    expect(page.locator("#folders-wrap")).to_be_hidden()
    expect(page.locator("#docs-table")).to_be_hidden()
    expect(page.locator("#kb-crumb")).to_be_hidden()
    expect(page.locator("#kb-level")).to_be_hidden()
    expect(page.locator("#sources-empty")).to_be_hidden()
    expect(page.locator("#folders-tbody tr")).to_have_count(0)
    expect(page.locator("#docs-tbody tr")).to_have_count(0)
    # …and there is no Edit affordance anywhere (the row buttons are
    # never built; the static level button sits in the hidden block).
    expect(page.locator(".kb-summary-edit:visible")).to_have_count(0)
    expect(page.locator("#kb-level-edit")).to_be_hidden()

    # The soft rule's wire-level proof (the phase-16 pattern, the
    # tree edition): not one catalog request — the anonymous gate
    # branch never fetches /api/docs/tree.
    assert docs_calls == [], f"anonymous RAG view fetched the catalog: {docs_calls}"