"""Unit: the remove confirmation modal on /git-sources.html (phase 69,
task 02).

Removal is a TOTAL removal (owner request 2026-09-02): the row, the
source's indexed documents (chunks + embeddings), and — for git clones
and uploaded archives — the files on the server's disk, all immediately
(task 01's ``DELETE /api/git-sources/{id}`` rewire). The page must
confirm that through a real in-app ``role="alertdialog"`` modal —
``window.confirm`` is retired — that names the source and states the
policy BEFORE the request goes out.

The browser behavior itself is E2E-gated by the phase-69 story suite
(``tests/e2e/test_source_removal_cleanup.py`` — task 03: focus,
Escape, ≥44px targets, the a11y interaction layer); like the other
frontend-adjacent unit files (``test_stale_ui_copy.py`` /
``test_summary_edit_ui.py`` house pattern), this module pins the
source-level contract a silent regression would break:

* ``window.confirm`` is GONE from the whole frontend (the only
  native confirm the app ever shipped);
* the static ``#remove-confirm-dialog`` markup — ``role="alertdialog"``,
  ``aria-modal``, ``aria-labelledby``/``aria-describedby``, hidden by
  default, the six child ids, the ``role="alert"`` error line, real
  ``type="button"`` buttons, the locked modal copy (verbatim);
* the JS lifecycle — ``openRemoveConfirm`` (textContent-only source
  population with makeRow's ``value`` expression, error cleared, focus
  on Cancel, the trigger recorded), cancel = Escape / Cancel button /
  backdrop (no request; focus returns to the trigger; a no-op while a
  DELETE is in flight), ``confirmRemove`` (§7.4 in-flight state: both
  buttons disable + "Removing…", success → close/reload/announce —
  the removal confirmation is the LAST announcement, non-2xx → the
  in-modal alert line + dialog stays open, network →
  the fixed reachable? line, re-enable in the finally);
* the stale "prunes on the next sync" removal copy is GONE from
  ``git-sources.js`` + the shell (phase 76 task 02 folded git-
  sources.html into index.html's Sources view); the new hint copy is
  PRESENT (the README pins are task 03's);
* styles.css — the modal classes on the house dark-tech palette
  (phase-08 tokens only, no CDN, no blur), ≥44px buttons, the
  ``[hidden]`` override, the err-token destructive pair.
"""
from __future__ import annotations

import re
from pathlib import Path

FRONTEND = Path(__file__).resolve().parents[2] / "frontend"
# Phase 76 (task 02): git-sources.html is folded into the ONE-document
# shell — the dialog markup now lives in the Sources view section of
# index.html (moved verbatim, ids unchanged).
SHELL_HTML = FRONTEND / "index.html"
JS = FRONTEND / "assets" / "git-sources.js"
CSS = FRONTEND / "assets" / "styles.css"

#: The locked modal copy (phase 69, 00_phase.md) — one fixed paragraph
#: for both kinds (the UI cannot tell an upload from the owner's own
#: directory; naming the source above it makes the target
#: unambiguous). Pinned verbatim against the normalized text.
MODAL_COPY = (
    "This permanently removes the source entry, all of its indexed "
    "documents from the knowledge base, and — for git clones and "
    "uploaded archives — the files on the server's disk. Files in "
    "your own local directories are never touched. This cannot be undone."
)

#: The new hint-box contract (phase 69): removal is immediate and
#: total; the modal spells it out; the Sync button mirrors the
#: remaining sources (upstream churn is still pruned on that run).
HINT_TOTAL_REMOVAL = "Removing a source is a total removal, done immediately"
HINT_MODAL_SPELLS_OUT = (
    "the confirmation modal spells out exactly what will be deleted"
)
HINT_FOREVER_SAFE = "files in your own local directories are never touched"

#: The success announce (the existing #git-sources-announcer live
#: region).
ANNOUNCE_OK = "Source removed — its files and index entries were cleaned up."

#: The retired confirm copy (task 02 stale-copy pins).
OLD_STAY_INDEXED = "stays indexed until the next sync"
# "prunes/pruned … on the next sync" in any shape (the old hint +
# confirm message).
OLD_NEXT_SYNC = re.compile(r"prun\w+[^.]{0,120}?next sync")


def _text(path: Path) -> str:
    return path.read_text(encoding="utf-8")


def _norm(text: str) -> str:
    """Collapse whitespace runs — the markup wraps long lines, so the
    locked copy is pinned against the normalized text."""
    return re.sub(r"\s+", " ", text).strip()


def _js() -> str:
    return _text(JS)


def _css() -> str:
    return _text(CSS)


def _fn(js: str, name: str) -> str:
    """The source of a (possibly async) top-level function via
    balanced-brace counting (the test_summary_edit_ui.py helper)."""
    for prefix in ("async function ", "function "):
        start = js.find(f"{prefix}{name}(")
        if start != -1:
            depth = 0
            for i in range(js.find("{", start), len(js)):
                if js[i] == "{":
                    depth += 1
                elif js[i] == "}":
                    depth -= 1
                    if depth == 0:
                        return js[start : i + 1]
            raise AssertionError(f"unbalanced braces in {name}()")
    raise AssertionError(f"{name}() must exist in git-sources.js")


def _element_block(html: str, id_attr: str, tag: str = "div") -> str:
    """The <tag … id=…> element's full markup (a balanced-tag walk —
    the dialog nests the backdrop / panel / actions divs; the hint is
    a <p>)."""
    marker = f'id="{id_attr}"'
    i = html.find(marker)
    assert i != -1, f"missing id={id_attr} in the shell's Sources view"
    opens = [m.start() for m in re.finditer(rf"<{tag}\b", html[:i])]
    assert opens, f"no <{tag}> owns id={id_attr}"
    open_i = opens[-1]
    depth = 0
    for m in re.finditer(rf"<{tag}\b[^>]*>|</{tag}>", html[open_i :]):
        if m.group(0).startswith(f"</{tag}>"):
            depth -= 1
        else:
            depth += 1
        if depth == 0:
            return html[open_i : open_i + m.end()]
    raise AssertionError(f"unbalanced <{tag}> for id={id_attr}")


# ---------- window.confirm is gone (the whole frontend) ----------


def test_window_confirm_is_gone_from_the_whole_frontend() -> None:
    """``window.confirm`` — the only native confirm the app ever
    shipped — is absent from EVERY frontend file (markup, scripts,
    styles — comments included: the retirement note must not keep the
    literal)."""
    for path in sorted(FRONTEND.rglob("*")):
        if path.is_file():
            assert "window.confirm" not in path.read_text(encoding="utf-8"), (
                f"window.confirm survived in {path.relative_to(FRONTEND)}"
            )


# ---------- the static dialog markup ----------


def test_dialog_markup_is_the_locked_alertdialog() -> None:
    """#remove-confirm-dialog: role="alertdialog" + aria-modal + the
    labelled/describedby pair, hidden by default, inside the manager
    (#git-sources-content — the static-markup convention, stable E2E
    selectors); all six child ids present; the error line is
    role="alert"; both buttons are real type="button"; the title is
    the locked h2; the modal copy is the locked paragraph verbatim."""
    html = _text(SHELL_HTML)
    frag = _element_block(html, "remove-confirm-dialog")
    open_tag = frag[: frag.find(">") + 1]
    assert 'role="alertdialog"' in open_tag
    assert 'aria-modal="true"' in open_tag
    assert 'aria-labelledby="remove-confirm-title"' in open_tag
    assert 'aria-describedby="remove-confirm-copy"' in open_tag
    assert "hidden" in open_tag, "the dialog ships hidden"
    # Static markup INSIDE the manager (the #git-sources-hint / gate
    # convention) — E2E can wait for the content to be revealed.
    assert html.find('id="git-sources-content"') < html.find("remove-confirm-dialog")
    for child in (
        "remove-confirm-title",
        "remove-confirm-source",
        "remove-confirm-copy",
        "remove-confirm-error",
        "remove-confirm-cancel",
        "remove-confirm-remove",
    ):
        assert f'id="{child}"' in frag, f"missing #{child} in the dialog"
    title = re.search(r"<h2[^>]*id=\"remove-confirm-title\"[^>]*>(.*?)</h2>", frag, re.S)
    assert title and _norm(title.group(1)) == "Remove this source?"
    err = re.search(r"<p[^>]*id=\"remove-confirm-error\"[^>]*>", frag)
    assert err and 'role="alert"' in err.group(0), "the in-modal error is role=alert"
    for btn in ("remove-confirm-cancel", "remove-confirm-remove"):
        m = re.search(rf"<button[^>]*id=\"{btn}\"[^>]*>", frag)
        assert m and 'type="button"' in m.group(0), f"#{btn} is a real type=button"
    cancel = re.search(r'<button[^>]*id="remove-confirm-cancel"[^>]*>(.*?)</button>', frag, re.S)
    remove = re.search(r'<button[^>]*id="remove-confirm-remove"[^>]*>(.*?)</button>', frag, re.S)
    assert cancel and _norm(cancel.group(1)) == "Cancel"
    assert remove and _norm(remove.group(1)) == "Remove source"
    assert _norm(MODAL_COPY) in _norm(frag), "the locked modal copy, verbatim"
    # The source value is a <code> (mono) — textContent-only in JS.
    src = re.search(r"<code[^>]*id=\"remove-confirm-source\"[^>]*>", frag)
    assert src, "#remove-confirm-source is a <code>"


# ---------- the JS lifecycle ----------


def test_open_populates_source_via_text_content_and_focuses_cancel() -> None:
    """openRemoveConfirm(s, triggerBtn): the source value is
    textContent ONLY (never innerHTML — the credential-masking
    discipline, phase 32) with makeRow's exact ``value`` expression
    (``s.path ?? s.url`` for local rows, ``s.url`` for git); the error
    line clears; the dialog unhides; the trigger is recorded; the
    keydown handler attaches; and focus lands on Cancel — the safe
    default for a destructive action (AFTER the unhide)."""
    body = _fn(_js(), "openRemoveConfirm")
    assert "s.kind === \"local\"" in body, "the kind-typed value branch"
    assert (
        "removeSourceEl.textContent = isLocal ? s.path ?? s.url : s.url" in body
    ), "the same `value` expression makeRow uses, via textContent"
    assert "removeSourceEl.innerHTML" not in _js(), "XSS contract: textContent only"
    assert "removeError.hidden = true" in body, "a new attempt starts clean"
    assert "removeTriggerBtn = triggerBtn" in body, "the trigger is recorded"
    trigger_i = body.find("removeTriggerBtn = triggerBtn")
    unhide_i = body.find("removeDialog.hidden = false")
    attach_i = body.find('document.addEventListener("keydown", onRemoveDialogKeydown)')
    focus_i = body.find("removeCancelBtn.focus()")
    assert -1 < trigger_i < unhide_i < attach_i < focus_i, (
        "record the trigger → unhide → attach keydown → focus Cancel"
    )


def test_row_button_opens_the_modal_and_the_row_error_span_is_retired() -> None:
    """makeRow's per-row Remove button opens the modal
    (openRemoveConfirm(s, btn)) — no confirm call, no per-row error
    span (the modal carries the in-flight error line); the retired
    .git-source-row-error class is gone from the JS AND the CSS."""
    js = _js()
    make = _fn(js, "makeRow")
    assert "openRemoveConfirm(s, btn)" in make, "the row's Remove opens the modal"
    assert "removeSource(" not in js, "the window.confirm-era flow is gone"
    assert "git-source-row-error" not in js
    assert "git-source-row-error" not in _css(), "the dead per-row error CSS is retired"


def test_cancel_paths_close_without_a_request() -> None:
    """Cancel (Cancel button / Escape / backdrop) closes as cancel:
    the dialog hides, the error line clears, the buttons reset
    ("Remove source"), the keydown handler detaches, and focus
    RETURNS to the recorded trigger — and the cancel path never
    fetches. A cancel while a DELETE is in flight is a no-op (no
    half-cancel of an in-progress server-side removal)."""
    js = _js()
    cancel = _fn(js, "cancelRemoveConfirm")
    guard_i = cancel.find("if (removeInFlight) return")
    close_i = cancel.find("closeRemoveConfirm()")
    assert -1 < guard_i < close_i, "the in-flight guard precedes the close"
    assert "fetch" not in cancel, "cancel never sends a request"
    close = _fn(js, "closeRemoveConfirm")
    hide_i = close.find("removeDialog.hidden = true")
    clear_i = close.find("removeError.hidden = true")
    reset_i = close.find('removeRemoveBtn.textContent = "Remove source"')
    detach_i = close.find('document.removeEventListener("keydown", onRemoveDialogKeydown)')
    save_i = close.find("const trigger = removeTriggerBtn")
    null_i = close.find("removeTriggerBtn = null")
    focus_i = close.find("trigger.focus()")
    assert -1 < hide_i < clear_i < reset_i < detach_i < save_i < null_i < focus_i, (
        "hide → clear → reset → detach → save trigger → focus return"
    )
    assert "removeCancelBtn.disabled = false" in close
    assert "removeRemoveBtn.disabled = false" in close


def test_escape_and_backdrop_and_cancel_button_all_cancel() -> None:
    """While open (handler attached on document in openRemoveConfirm,
    detached in closeRemoveConfirm): Escape → preventDefault +
    cancelRemoveConfirm; the dim backdrop AND the Cancel button wire
    to cancelRemoveConfirm (only "Remove source" wires to
    confirmRemove). Tab/Shift+Tab stay inside the two-button modal
    (aria-modal honored for keyboard users)."""
    js = _js()
    keydown = _fn(js, "onRemoveDialogKeydown")
    esc_i = keydown.find('e.key === "Escape"')
    prevent_i = keydown.find("e.preventDefault()", esc_i)
    cancel_i = keydown.find("cancelRemoveConfirm()", esc_i)
    assert -1 < esc_i < prevent_i < cancel_i, "Escape: prevent + cancel"
    assert 'e.key === "Tab"' in keydown, "the two-button focus cycle"
    assert 'removeCancelBtn.addEventListener("click", cancelRemoveConfirm)' in js
    assert 'removeBackdrop.addEventListener("click", cancelRemoveConfirm)' in js
    assert 'removeRemoveBtn.addEventListener("click", confirmRemove)' in js


def test_confirm_runs_the_inflight_never_stale_lifecycle() -> None:
    """confirmRemove: the §7.4 in-flight state BEFORE the fetch —
    both buttons disable + the confirm relabels "Removing…"; one
    DELETE /api/git-sources/{id}. Success (204): close (focus return)
    → loadSources → announce (the removal confirmation is the LAST
    announcement — the reload's "N sources listed." must not
    overwrite it). Non-2xx: the in-modal role=alert line
    (apiDetail, 422 shape-aware) and the dialog STAYS open (no
    closeRemoveConfirm in the failure slice). Network failure: the
    fixed reachable? line. The finally re-enables BOTH buttons +
    relabels "Remove source" — never stale on any outcome."""
    body = _fn(_js(), "confirmRemove")
    guard_i = body.find("if (!removingId || removeInFlight) return")
    inflight_i = body.find("removeInFlight = true")
    clear_i = body.find("removeError.hidden = true")
    dis_c = body.find("removeCancelBtn.disabled = true")
    dis_r = body.find("removeRemoveBtn.disabled = true")
    label_i = body.find('"Removing…"')
    fetch_i = body.find("fetch(`/api/git-sources/${encodeURIComponent(removingId)}`")
    method_i = body.find('method: "DELETE"', fetch_i)
    assert -1 < guard_i < inflight_i < clear_i < dis_c < dis_r < label_i < fetch_i < method_i, (
        "guard → in-flight → clear error → disable both + label → DELETE"
    )
    # Success: close → reload → announce (the exact order, the exact
    # announce string) — the removal confirmation is the LAST
    # announcement: the reload's "N sources listed." must not
    # overwrite it (phase 69 task 03's E2E pins the success line on
    # the announcer after a real removal).
    ok_i = body.find("if (r.ok)")
    close_i = body.find("closeRemoveConfirm()", ok_i)
    reload_i = body.find("await loadSources()", close_i)
    announce_i = body.find(f'announce("{ANNOUNCE_OK}")', reload_i)
    assert -1 < ok_i < close_i < reload_i < announce_i
    assert body.count("closeRemoveConfirm()") == 1, (
        "only the success path closes — failures stay open for one retry"
    )
    # Non-2xx: the in-modal alert line, dialog stays open.
    nonok_i = body.find("Could not remove the source — try again.")
    catch_i = body.find("} catch {")
    assert -1 < nonok_i < catch_i
    assert "await apiDetail(r," in body[body.find("if (r.ok)"):catch_i], (
        "the server detail is apiDetail-extracted (422 shape-aware)"
    )
    failure_slice = body[body.rfind("// non-2xx", 0, catch_i):catch_i]
    assert "closeRemoveConfirm" not in failure_slice, "failure keeps the dialog open"
    # Network: the fixed reachable? line.
    net_i = body.find("Could not remove the source — is the app reachable?", catch_i)
    assert -1 < net_i < body.find("finally"), "the network copy lands in the catch"
    # Never stale: the finally re-enables BOTH buttons + relabels.
    fin_i = body.find("finally")
    fin = body[fin_i:]
    assert "removeInFlight = false" in fin
    assert "removeCancelBtn.disabled = false" in fin
    assert "removeRemoveBtn.disabled = false" in fin
    assert 'removeRemoveBtn.textContent = "Remove source"' in fin


# ---------- the stale copy is gone; the new hint is present ----------


def test_stale_next_sync_removal_copy_is_gone() -> None:
    """The phase-35 "prunes on the next sync" removal contract is
    superseded: the retired confirm copy AND any 'prune(s/d) … next
    sync' shape are absent from git-sources.js + the shell (code AND
    comments — the docstring copy moved with the flow). The README
    pins are task 03's."""
    for path in (JS, SHELL_HTML):
        raw = _text(path)
        norm = _norm(raw)
        assert OLD_STAY_INDEXED not in raw, (
            f"retired confirm copy still in {path.name}"
        )
        m = OLD_NEXT_SYNC.search(norm)
        assert m is None, f"'next sync' removal copy survived in {path.name}: {m.group(0)!r}"


def test_new_hint_copy_is_present_in_the_html() -> None:
    """The #git-sources-hint carries the new contract: removal is a
    total removal, done immediately (the modal spells it out; foreign
    local directories are never touched), and the Sync button still
    mirrors the remaining sources (upstream churn is pruned on that
    run — not 'on the next sync')."""
    hint = _norm(_element_block(_text(SHELL_HTML), "git-sources-hint", tag="p"))
    for frag in (HINT_TOTAL_REMOVAL, HINT_MODAL_SPELLS_OUT, HINT_FOREVER_SAFE):
        assert frag in hint, f"the new hint copy is missing: {frag!r}"
    assert "pruned on that run" in hint, "the Sync-mirror clause (upstream churn)"
    assert "next sync" not in hint, "no 'next sync' removal claim in the hint"


def test_module_docstring_carries_the_new_contract() -> None:
    """The git-sources.js module docstring's remove bullet + scope
    boundary moved with the flow: the modal names the source + states
    the policy, and removal performs the FULL cleanup server-side
    (row + index + app-managed files) — with the navigating-away
    note (the row + index commit first; an interrupted file step
    leaves an inert orphan dir)."""
    doc = _js().split("*/", 2)[0]  # the module docstring (first block)
    for frag in (
        'role="alertdialog"',
        "textContent ONLY",
        'relabels "Removing…"',
        "not recommended",
        "inert orphan",
        "FULL cleanup server-side",
        "foreign local directories are never touched",
    ):
        assert frag in doc, f"the module docstring lost: {frag!r}"


# ---------- styles.css ----------


def test_modal_css_classes_present_and_house_tokens_only() -> None:
    """styles.css carries the modal class family on the house
    dark-tech palette (phase-08 tokens): the overlay + backdrop +
    panel, the title / source / copy / error / actions / two-button
    chrome; the [hidden] override (the documented, testable
    contract); the global 3px :focus-visible outline is NOT
    suppressed; no CDN; no blur (the phase-08 no-blur perf anchor)."""
    css = _css()
    for cls in (
        ".remove-confirm",
        ".remove-confirm-backdrop",
        ".remove-confirm-panel",
        ".remove-confirm-title",
        ".remove-confirm-source",
        ".remove-confirm-copy",
        ".remove-confirm-error",
        ".remove-confirm-actions",
        ".remove-confirm-btn",
        ".remove-confirm-cancel",
        ".remove-confirm-remove",
    ):
        assert f"{cls} " in css or f"{cls}." in css or f"{cls}[" in css, (
            f"styles.css must style {cls}"
        )
    hidden = css.find(".remove-confirm[hidden]")
    assert hidden != -1 and "display: none" in css[hidden : hidden + 60], (
        "the hidden attr must beat the display rule"
    )
    assert ":focus-visible {" in css and "outline: 3px solid var(--brand)" in css
    # No blur (the phase-08 no-blur perf anchor) — the backdrop rule
    # itself must not carry backdrop-filter.
    backdrop = css[css.find(".remove-confirm-backdrop {") :]
    backdrop = backdrop[: backdrop.find("\n}")]
    # Comments stripped — the note "no backdrop-filter (no-blur)" must
    # not trip the pin; only a real declaration may.
    backdrop = re.sub(r"/\*.*?\*/", "", backdrop, flags=re.S)
    assert "backdrop-filter" not in backdrop, "no blur (phase-08 perf anchor)"
    assert "url(http" not in css and "@import url(" not in css, (
        "no CDN (AGENTS.md rule 6)"
    )


def test_modal_css_targets_and_contrast_pairs() -> None:
    """The WCAG 2.1 AA basics in CSS: both buttons >=44px; the
    destructive button rides the err token family (err-ink on err-bg
    9.3:1, the err-line border — the .tuning-delete / .steering-delete
    convention; the hover inverts to --bg on --err-line, 5.2:1);
    Cancel is the ghost ink-soft family (5.1:1 on --surface); the
    error line is the err pair; the panel caps at the 46rem
    chat-column width or the viewport."""
    css = _css()
    btn = css[css.find(".remove-confirm-btn {"):]
    btn = btn[: btn.find("\n}")]
    assert "min-height: 44px" in btn and "min-width: 44px" in btn
    remove = css[css.find(".remove-confirm-remove {"):]
    remove = remove[: remove.find("\n}")]
    for prop in ("var(--err-bg)", "var(--err-ink)", "var(--err-line)"):
        assert prop in remove, f"the destructive pair must keep {prop}"
    hover = css[css.find(".remove-confirm-remove:hover:not(:disabled) {"):]
    hover = hover[: hover.find("\n}")]
    assert "var(--err-line)" in hover and "var(--bg)" in hover, (
        "the hover inversion: dark --bg on --err-line (5.2:1)"
    )
    cancel = css[css.find(".remove-confirm-cancel {"):]
    cancel = cancel[: cancel.find("\n}")]
    assert "var(--ink-soft)" in cancel and "transparent" in cancel
    err = css[css.find(".remove-confirm-error {"):]
    err = err[: err.find("\n}")]
    assert "var(--err-ink)" in err and "var(--err-bg)" in err
    panel = css[css.find(".remove-confirm-panel {"):]
    panel = panel[: panel.find("\n}")]
    assert "min(46rem" in panel, "the 46rem chat-column cap (or the viewport)"