"""Unit: phase 165 task 02 — the word-wrap fix is PROVABLY SCOPED.

TODO.md L3 asks for word wrap on "image explanations and other long
text". Phase 116's LOCKED A1 keeps horizontal scroll (NO line-wrap) for
the code content — "wrapping breaks code readability" — so the fix must
wrap exactly the prose set and nothing else. These pins make a future
"we fixed wrapping" mean "we wrapped prose", never "we wrapped code" or
"we wrapped wide tables":

* **the prose set is pinned as data** — ``PROSE_FORMATS`` holds exactly
  ``"txt"`` and ``"text"`` (a set-membership assertion over the source
  line: adding a format is a deliberate, test-editing act), and
  ``isProseDoc`` tests ``doc.is_image`` BEFORE the format arm (phase 122
  A3 — an image doc's ``content`` IS the vision description, prose by
  construction whatever its extension);
* **the code scrollers are unchanged** — ``.doc-raw`` keeps
  ``white-space: pre`` + ``overflow-x: auto``, ``.bubble pre`` keeps
  ``overflow-x: auto`` with NO ``white-space`` added (the chat code
  block), and ``.md-table-wrap`` / ``.md-table`` still carry the
  phase-44 declaration (``overflow-x: auto`` on the wrapper,
  ``min-width: max-content`` on the table) so wide tables still scroll
  sideways inside the reading column;
* **phase 116's scrollbar theme still applies** — the four
  ``.doc-modal .doc-raw`` rules (``scrollbar-width``,
  ``scrollbar-color`` and the three ``::-webkit-scrollbar`` pseudos) are
  all present and still SCOPED to the modal (no global scrollbar
  restyle — the TODO's scope);
* **``.doc-prose`` never reaches for the raw scroller** — the block has
  no ``overflow-x`` and no ``white-space: pre;``, only ``pre-wrap`` +
  ``overflow-wrap: anywhere`` (the wrapping contract);
* **the AA/contrast pin for the new block** — ``color: var(--ink)`` on
  ``background: var(--surface)`` (the documented 14.5:1 pair, PLAN
  §7.2) and ZERO color literals in the block (the phase-92
  zero-literal / monochrome invariant — the ``:root``-drift test parses
  built-ins out of styles.css).

Repo-hygiene finding (task 02 step 3, ``grep -rn "doc-raw" frontend/``)
— recorded here so the check is repeatable and its result on record:
``doc-raw`` appears in exactly TWO writers, both expected. (1) The raw
arm of ``app.renderDocument`` in ``frontend/assets/document.js`` (the
ONE viewer core, ``pre.className = "doc-raw"``) plus its doc comments;
(2) ``frontend/assets/styles.css`` (the base rule, the mobile squeeze,
the phase-116 modal scrollbar rules and the ``[data-view="pages"]``
hide list). Every other hit in ``frontend/`` is a comment.
``frontend/doc-edit.html`` + ``assets/doc-edit.js`` do NOT render
document content at all — they fill a ``<textarea>`` (``bodyInput.value
= draft.body``, textContent for the status/error lines) for the admin
draft editor, so the body never becomes markup and there is no scroller
to wrap; ``frontend/shared.html`` + ``assets/shared.js`` render
CHAT history through ``renderMarkdown`` into ``.bubble`` (the shared
renderer's own ``.md-table-wrap`` / ``.bubble pre`` scrollers, asserted
byte-identical above), never ``.doc-raw`` / ``.doc-md`` /
``.doc-prose``. Neither is a second content renderer, so the prose rule
correctly lives in the ONE place: ``isProseDoc`` + ``.doc-prose``.

ASSUMPTION (phase 165 A4, owner call — recorded in ``00_phase.md``
"Deferred"): PDF-extracted text (``format == "pdf"``) is deliberately
OUT of the prose set and stays in ``.doc-raw``. Three completed suites
pin ``pre.doc-raw`` for PDFs (``test_pdf_pages_in_sources.py``,
``test_pdf_strip_additive_selfheal.py``, ``test_garbage_pdf.py``) and
the phase-163 strip contract depends on it; changing it is an owner
call, one line (``PROSE_FORMATS.add("pdf")`` + those pins) once made —
not an executor choice and not an oversight.

All assertions are static-source (the ``test_markdown_tables.py`` /
``test_date_editor.py`` house pattern): no app, no browser. The
measured wrapping proof is the phase's E2E suite
(``tests/e2e/test_prose_word_wrap.py``, task 03).
"""
from __future__ import annotations

import re
from pathlib import Path

FRONTEND = Path(__file__).resolve().parents[2] / "frontend"
DOCUMENT_JS = FRONTEND / "assets" / "document.js"
STYLES_CSS = FRONTEND / "assets" / "styles.css"


def _js() -> str:
    assert DOCUMENT_JS.is_file(), f"missing frontend file: {DOCUMENT_JS}"
    return DOCUMENT_JS.read_text(encoding="utf-8")


def _css() -> str:
    assert STYLES_CSS.is_file(), f"missing frontend file: {STYLES_CSS}"
    return STYLES_CSS.read_text(encoding="utf-8")


def _rule(selector: str, css: str | None = None) -> str:
    """The FULL rule for ``selector`` (selector text + its ``{…}``
    block) matched at line start, so ``.doc-raw`` cannot accidentally
    match ``.doc-modal .doc-raw`` or ``.doc-views … .doc-raw`` (the
    ``_rule_block`` brace-walk of ``test_wide_column_css.py``)."""
    text = _css() if css is None else css
    m = re.search(rf"^{re.escape(selector)} \{{", text, re.MULTILINE)
    assert m, f"styles.css must define a rule for {selector}"
    start = text.index("{", m.start())
    depth = 0
    for i in range(start, len(text)):
        if text[i] == "{":
            depth += 1
        elif text[i] == "}":
            depth -= 1
            if depth == 0:
                return text[m.start() : i + 1]
    raise AssertionError(f"unbalanced braces in the {selector} rule")


def _decls(selector: str) -> str:
    """Only the declaration block of ``selector`` (the braces stripped)."""
    rule = _rule(selector)
    return rule[rule.index("{") + 1 : rule.rindex("}")]


def _rules() -> list[tuple[str, str]]:
    """Every (selector, declarations) pair in styles.css, comments
    stripped (so a provenance comment naming a property never counts as
    a declaration) — the scope pins below walk this list."""
    text = re.sub(r"/\*.*?\*/", "", _css(), flags=re.DOTALL)
    pairs: list[tuple[str, str]] = []
    for m in re.finditer(r"([^{}]+)\{", text):
        selector = re.sub(r"\s+", " ", m.group(1)).strip()
        # An at-rule header (@media …) is a container, not a selector.
        if not selector or selector.startswith("@"):
            continue
        start = m.end()
        depth = 1
        i = start
        while i < len(text) and depth:
            if text[i] == "{":
                depth += 1
            elif text[i] == "}":
                depth -= 1
            i += 1
        pairs.append((selector, text[start : i - 1]))
    return pairs


def _hide_list_rule() -> str:
    """The phase-163 ``[data-view="pages"]`` hide list — a MULTI-selector
    rule (the selectors are comma-separated lines, ``.doc-prose``
    joined it in task 01), so it is sliced from its first selector to
    the ``display: none; }`` that closes it rather than matched with
    the single-selector ``_rule`` helper."""
    css = _css()
    start = css.index('.doc-views[data-view="pages"] .doc-summary')
    end = css.index("display: none; }", start) + len("display: none; }")
    return css[start:end]


def _code(text: str) -> str:
    """Comment-free source: block comments (``/* … */``, the JSDoc
    headers that legitimately NAME the classes they describe) and
    whole-line ``//`` comments stripped — so a writer scan counts CODE
    only, not prose about the code."""
    no_block = re.sub(r"/\*.*?\*/", "", text, flags=re.DOTALL)
    return "\n".join(
        line for line in no_block.splitlines() if not line.lstrip().startswith("//")
    )


def _prose_rule_js(js: str) -> str:
    """The phase-165 prose rule at module scope: ``const
    PROSE_FORMATS`` through the close of ``isProseDoc`` (the
    ``test_document_viewer.py`` extraction — the function references
    the const, so they are read as one unit)."""
    start = js.index("const PROSE_FORMATS")
    end = js.index("}", js.index("function isProseDoc")) + 1
    return js[start:end]


# ---------- the prose set is pinned as data (LOCKED A1) ----------


def test_prose_formats_set_contains_exactly_txt_and_text() -> None:
    """``PROSE_FORMATS`` contains EXACTLY {"txt", "text"} — parsed out
    of the source line as a set of quoted members, so adding (or
    renaming) a format fails this test and has to be an intentional,
    test-editing decision (phase 165 D3: "a future format cannot drift
    into prose by accident"). Code, code-ish and pdf are NOT here."""
    line = re.search(r"const PROSE_FORMATS = new Set\(\[(.*?)\]\);", _js())
    assert line, "PROSE_FORMATS must be a Set literal at module scope"
    members = set(re.findall(r'"([^"]*)"', line.group(1)))
    assert members == {"txt", "text"}, (
        f"the prose format set is {sorted(members)}, not exactly ['text', 'txt'] "
        "(locked A1: image descriptions + plain-text prose only)"
    )
    # The literal is the only place those strings gate the content arm.
    assert len(re.findall(r"const PROSE_FORMATS", _js())) == 1, (
        "the prose set is declared ONCE (the single-site rule)"
    )


def test_is_prose_doc_reads_is_image_before_the_format_arm() -> None:
    """``isProseDoc`` tests ``doc.is_image === true`` FIRST and the
    ``PROSE_FORMATS`` arm second (locked A1 + phase 122 A3): the image
    arm is unconditional, so an image doc is prose whatever its
    extension — and the strict ``=== true`` keeps a string lookalike
    out (the truth table in test_document_viewer.py covers behavior)."""
    rule = _prose_rule_js(_js())
    returns = re.findall(r"return (.*?);", rule)
    assert len(returns) == 1, f"isProseDoc is a one-return predicate, got {returns}"
    body = returns[0]
    image_i = body.index("doc.is_image")
    format_i = body.index("PROSE_FORMATS.has(doc.format)")
    assert image_i < format_i, "the is_image arm must be evaluated first"
    assert body[image_i:].startswith("doc.is_image === true ||"), (
        "the image arm is strict (=== true) and ORs into the format arm"
    )


# ---------- the code scrollers are present and unchanged (A3) ----------


def test_doc_raw_keeps_the_locked_pre_and_horizontal_scroller() -> None:
    """.doc-raw — the code/code-ish/unknown/PDF content block — is
    byte-identical to the pre-phase declaration in the two properties
    that ARE the contract: white-space: pre (no wrapping) and
    overflow-x: auto (the scroller). Phase 116's locked A1, restated
    verbatim as phase 165's locked A3."""
    decls = _decls(".doc-raw")
    assert re.search(r"white-space:\s*pre;", decls), (
        ".doc-raw must keep white-space: pre — code never wraps (locked A3)"
    )
    assert re.search(r"overflow-x:\s*auto", decls), (
        ".doc-raw must keep overflow-x: auto — the horizontal scroller"
    )
    assert "pre-wrap" not in decls, ".doc-raw must not gain pre-wrap"


def test_bubble_pre_scrolls_and_never_gains_a_white_space_rule() -> None:
    """The chat/table-surface code block: .bubble pre still scrolls
    sideways (overflow-x: auto) and still declares NO white-space —
    the phase-165 fix touched the viewer's prose arm only, so a code
    span in a chat answer wraps exactly as it did before (wrapping
    breaks code readability — the reason behind phase 116's locked A1)."""
    decls = _decls(".bubble pre")
    assert re.search(r"overflow-x:\s*auto", decls), (
        ".bubble pre must keep its horizontal scroller"
    )
    assert "white-space" not in decls, (
        ".bubble pre must carry no white-space declaration (unchanged)"
    )


def test_markdown_table_scrollers_match_the_phase_44_declaration() -> None:
    """Wide GFM tables still scroll, never wrap: .md-table-wrap is
    STILL the one-declaration scroller (overflow-x: auto) and
    .md-table still carries the phase-44 task-03 set —
    border-collapse + width: 100% + min-width: max-content + 0.9rem —
    byte-for-byte, so the wrapper stays the real scroller and the
    72rem reading column never breaks."""
    assert _rule(".md-table-wrap") == ".md-table-wrap { overflow-x: auto; }", (
        "the table wrapper must stay the single-declaration horizontal scroller"
    )
    decls = _decls(".md-table")
    for declaration in (
        "border-collapse: collapse",
        "width: 100%",
        "min-width: max-content",
        "font-size: 0.9rem",
    ):
        assert declaration in decls, f".md-table must keep {declaration!r}"


# ---------- phase 116's scrollbar theme still applies (A1) ----------


def test_phase_116_modal_scrollbar_rules_are_all_present_and_scoped() -> None:
    """The four .doc-modal .doc-raw rules — scrollbar-width: thin,
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track),
    and the ::-webkit-scrollbar / -track / -thumb pseudos — survive
    this phase intact and stay SCOPED under .doc-modal (no global
    scrollbar restyle). What still lands in .doc-raw still gets the
    themed bar: the prose block has no scrollbar to theme because it
    never overflows horizontally."""
    css = _css()
    firefox = _rule(".doc-modal .doc-raw")
    assert re.search(r"scrollbar-width:\s*thin", firefox)
    assert re.search(
        r"scrollbar-color:\s*var\(--scrollbar-thumb\) var\(--scrollbar-track\)", firefox
    )
    for pseudo, needle in (
        (".doc-modal .doc-raw::-webkit-scrollbar", "height: 8px"),
        (".doc-modal .doc-raw::-webkit-scrollbar-track", "background: var(--scrollbar-track)"),
        (".doc-modal .doc-raw::-webkit-scrollbar-thumb", "background: var(--scrollbar-thumb)"),
    ):
        rule = _rule(pseudo, css)
        assert needle in rule, f"{pseudo} must keep {needle!r}"
    # Scope pin (phase 116: "no global scrollbar restyle"): every rule
    # that themes a scrollbar — a scrollbar-color declaration or a
    # ::-webkit-scrollbar pseudo — is scoped under `.doc-modal .doc-raw`.
    themed = [
        sel
        for sel, decls in _rules()
        if "scrollbar-color" in decls or "scrollbar" in sel
    ]
    assert len(themed) == 4, f"expected the 4 modal scrollbar rules, got {themed}"
    for selector in themed:
        assert selector.startswith(".doc-modal .doc-raw"), (
            f"scrollbar rule {selector!r} escaped the modal scope (phase 116 scope pin)"
        )
    # The prose block never asks for a themed bar (it has none to theme).
    assert not [s for s, d in _rules() if ".doc-prose" in s and "scrollbar" in d + s], (
        ".doc-prose must carry no scrollbar theming"
    )


# ---------- .doc-prose never reaches for the raw scroller ----------


def test_doc_prose_declares_no_horizontal_scroller_and_no_pre() -> None:
    """.doc-prose is the OPPOSITE contract of .doc-raw: no overflow-x
    of any kind, and white-space is pre-WRAP (never the bare ``pre``
    that made every generated line unbreakable). The wrapping comes
    from white-space: pre-wrap + overflow-wrap: anywhere inside the
    72rem column — nothing else."""
    decls = _decls(".doc-prose")
    assert "overflow-x" not in decls, (
        ".doc-prose must never declare a horizontal scroller (the TODO's ask)"
    )
    assert re.search(r"white-space:\s*pre-wrap", decls)
    assert not re.search(r"white-space:\s*pre;", decls), (
        ".doc-prose must not carry the bare pre (the defect this phase fixes)"
    )
    assert re.search(r"overflow-wrap:\s*anywhere", decls)
    assert re.search(r"max-width:\s*var\(--chat-column\)", decls), (
        "the prose block rides the 72rem reading column"
    )


# ---------- the AA/contrast pin for the new block ----------


def test_doc_prose_uses_the_documented_aa_pair_and_zero_literals() -> None:
    """.doc-prose pairs color: var(--ink) with background:
    var(--surface) — the documented 14.5:1 pair (PLAN §7.2, WCAG AA) —
    and carries NO color literal at all (no hex, no rgb()/rgba(), no
    hsl(), no color-mix): the phase-92 zero-literal invariant that
    keeps the block correct under every saved theme, and what the
    :root-drift test relies on when it parses styles.css."""
    decls = _decls(".doc-prose")
    assert re.search(r"color:\s*var\(--ink\)", decls)
    assert re.search(r"background:\s*var\(--surface\)", decls)
    for pattern, name in (
        (r"#[0-9a-fA-F]{3,8}\b", "hex"),
        (r"\brgba?\(", "rgb()/rgba()"),
        (r"\bhsla?\(", "hsl()/hsla()"),
        (r"color-mix\(", "color-mix()"),
    ):
        assert not re.search(pattern, decls), f".doc-prose must carry no {name} literal"


# ---------- the raw writers are the two expected ones (step 3) ----------


def test_doc_raw_writers_are_the_raw_branch_and_the_phase_116_css_only() -> None:
    """The task-02 hygiene pass as an executable pin: the only FILE that
    writes the doc-raw element is document.js's raw arm (one
    ``className`` assignment, inside renderDocument), and the only
    other doc-raw writers in frontend/ are styles.css rules (the base
    rule, the mobile squeeze, the phase-116 modal scrollbar rules and
    the [data-view="pages"] hide list). doc-edit.js renders a
    <textarea> and shared.js renders chat bubbles — neither is a second
    content renderer, so neither needs the prose rule (see the module
    docstring for the full finding)."""
    js = _js()
    assert js.count('className = "doc-raw"') == 1, (
        "document.js must assign doc-raw in exactly one place (the raw arm)"
    )
    # A WRITER is code that emits the class (JS className/innerHTML, an
    # HTML class attribute) — a doc comment naming it is not one.
    writer = re.compile(r'className\s*=\s*"doc-raw"|class="[^"]*\bdoc-raw\b')
    for path in sorted(FRONTEND.rglob("*")):
        if not path.is_file() or path.suffix not in {".js", ".html"}:
            continue
        writes = len(writer.findall(_code(path.read_text(encoding="utf-8"))))
        if path == DOCUMENT_JS:
            assert writes == 1, f"{path.name} must hold exactly the one raw arm"
        else:
            assert writes == 0, (
                f"{path.name} must not write doc-raw — the writers are "
                "renderDocument's raw arm and styles.css only"
            )
    # The two expected writers DO hold it (the pin is not vacuous).
    assert "doc-raw" in _css(), "styles.css is the second expected doc-raw writer"


def test_prose_block_mounts_where_the_raw_block_did() -> None:
    """The prose arm appends into the SAME ``slot`` the raw arm uses,
    so the phase-122 image block stays FIRST, the phase-36 summary
    panel between, and the phase-163 additive strip last — the ordering
    both surfaces rely on. The [data-view="pages"] hide list carries
    .doc-prose alongside .doc-raw (the additive/PDF case's text view),
    so Pages still hides the text view for a prose doc."""
    js = _js()
    for arm in ("wrap", "prose", "pre"):
        assert js.count(f"slot.appendChild({arm});") == 1, (
            f"the {arm} arm must mount into slot exactly once"
        )
    # One slot binding, three arms (the shared mount point), and the
    # strip still lands in the wrapper last.
    assert "let slot = contentEl;" in js, "the three arms share one slot binding"
    assert "views.appendChild(docPagesStrip(doc, pageUrls));" in js
    hide = _hide_list_rule()
    for cls in (".doc-summary", ".doc-md", ".doc-raw", ".doc-prose", ".doc-image"):
        assert cls in hide, f"the [data-view=\"pages\"] hide list must include {cls}"
    assert hide.count("display: none;") == 1, "the hide list stays ONE grouped declaration"