"""Unit: the phase-130 (task 03, TODO L6) chat cluster rows — CSS.

The bubble's metadata reads as organized rows, top to bottom: the
answer text → the answer figure (phase 124, unchanged) → the source
chips row (text refs only) → the source images row (`.msg-images`,
phase 130 task 01) → the "Nearby docs" row (phase 113, unchanged) →
the actions row (`.msg-actions`, phase 130 task 02) — never one soup
div. The DOM is built by app.js (pinned by test_frontend_actions_cluster
and test_source_chip_quality); THIS module pins the row-level layout
that makes the clusters read as clusters:

* the actions row right-aligns its buttons as a cluster — the "bottom
  right" is the row's ``justify-content: flex-end``, and the
  per-button auto margins (the phase-49/59 ``.tune-btn`` /
  ``.retry-btn`` / ``.save-as-doc-btn`` margin mechanisms) are GONE;
* the images row wraps its figures with the chips row's rhythm (the
  base ``.msg-meta`` wrap + 0.35rem gap + center align — pinned
  explicitly so the two clusters cannot drift apart);
* the audit (task 03 item 3): the chips row and the related row are
  untouched, the ``.source-image`` figure styles are untouched, and
  the mobile squeeze pins nothing about the actions row left — the
  cluster stays right-aligned at every width.

House source-pin pattern (no browser); the browser-level bounding-box
assertions are E2E-gated by tests/e2e/test_chat_answer_clusters.py
(task 04).
"""
from __future__ import annotations

import re
from pathlib import Path

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


def _css() -> str:
    return STYLES_CSS.read_text(encoding="utf-8")


def _block(css: str, selector: str) -> str:
    """The first ``<selector> { … }`` rule body — the house pin
    pattern (the cluster selectors are unique in the sheet)."""
    m = re.search(re.escape(selector) + r" \{([^}]*)\}", css)
    assert m, f"styles.css must style {selector}"
    return m.group(1)


def _media_block(css: str, query: str) -> str:
    """The body of the ``@media (<query>)`` block — the house non-
    greedy pattern (the sheet indents the block's nested closing
    braces, so the FIRST column-0 ``}`` is the block's own end)."""
    pattern = "@media \\(" + re.escape(query) + r"\) \{([\s\S]*?)\n\}"
    m = re.search(pattern, css)
    assert m, f"{query} media query missing"
    return m.group(1)


# ---------------------------------------------------------------------------
# the actions cluster — right-aligned by the ROW, no per-button margins
# ---------------------------------------------------------------------------


def test_actions_row_rule_right_aligns_the_cluster() -> None:
    """``.msg-meta.msg-actions`` right-aligns its contents — the TODO's
    "bottom right" is the bubble's LAST row (the DOM order, phase 130
    task 02) + this row-level justify. No positioning tricks: the row
    keeps the base .msg-meta flex/wrap/rhythm, only the justify moves."""
    css = _css()
    assert re.search(r"\.msg-meta\.msg-actions \{", css), (
        "the .msg-meta.msg-actions row rule is missing"
    )
    body = _block(css, ".msg-meta.msg-actions")
    assert "justify-content: flex-end" in body, (
        "the row's justify does the 'bottom right' (right edge)"
    )
    # Row-level only — no absolute/float/transform tricks.
    for prop in ("position", "float", "transform", "margin", "padding"):
        assert prop not in body, (
            f"the actions row is a plain flex row ({prop} is a "
            "positioning trick — the row order is DOM order)"
        )


def test_no_per_button_auto_margins_remain() -> None:
    """The per-button auto margins (the pre-phase-130 mechanism the
    markLastRetryable comment named) are gone from ALL THREE action
    buttons — grep-confirmed: the buttons are plain flex items of the
    actions row, and the row's justify does the alignment. (Completion
    criterion: 'right-aligned by .msg-actions alone'.)"""
    css = _css()
    for selector in (".tune-btn", ".retry-btn", ".save-as-doc-btn"):
        body = _block(css, selector)
        assert "margin-left: auto" not in body, (
            f"{selector}: the per-button auto margin must be gone — "
            "the .msg-actions row's justify right-aligns the cluster"
        )
        assert "margin-inline-start: auto" not in body, (
            f"{selector}: the per-button auto margin must be gone"
        )
        assert "margin-right: auto" not in body and "margin-inline-end: auto" not in body


def test_button_family_is_untouched() -> None:
    """Removing the auto margins is the ONLY change to the button
    rules — the phase-49/59 visual family (pill, ≥44px, line border,
    ink-soft palette, brand/neutral hovers, 14px glyph) is intact."""
    css = _css()
    for selector in (".tune-btn", ".retry-btn", ".save-as-doc-btn"):
        body = _block(css, selector)
        for prop in (
            "display: inline-flex",
            "min-height: 44px",
            "padding: 0.35rem 0.8rem",
            "border-radius: 999px",
            "border: 1px solid var(--line)",
            "color: var(--ink-soft)",
            "font-size: 0.82rem",
            "cursor: pointer",
        ):
            assert prop in body, f"{selector} must keep the family ({prop})"
        assert f"{selector} svg {{ width: 14px; height: 14px" in css
        assert f"{selector}:hover" in css


# ---------------------------------------------------------------------------
# the images cluster — wraps like the chips row
# ---------------------------------------------------------------------------


def test_images_row_rule_wraps_like_the_chips_row() -> None:
    """``.msg-meta.msg-images`` pins the chips row's rhythm EXPLICITLY
    (wrap + the base .msg-meta 0.35rem gap + center align) — no new
    spacing values (task 03: 'match the EXISTING .msg-meta gap/align
    values'). A future base-rule change cannot drift the two clusters
    apart."""
    css = _css()
    assert re.search(r"\.msg-meta\.msg-images \{", css), (
        "the .msg-meta.msg-images row rule is missing"
    )
    body = _block(css, ".msg-meta.msg-images")
    assert "flex-wrap: wrap" in body, "the figures wrap (many image refs)"
    assert "gap: 0.35rem" in body, (
        "the images row's gap MUST equal the chips row's gap "
        "(the base .msg-meta 0.35rem — no invented spacing)"
    )
    assert "align-items: center" in body, "the row aligns like the chips row"


def test_base_msg_meta_rhythm_is_unchanged() -> None:
    """The base ``.msg-meta`` rule (the chips row, the related row, and
    every meta row's rhythm) is untouched: flex + wrap + 0.35rem gap +
    center align + the soft-ink 0.75rem text."""
    css = _css()
    body = _block(css, ".msg-meta")
    for prop in (
        "font-size: 0.75rem",
        "color: var(--ink-soft)",
        "display: flex",
        "flex-wrap: wrap",
        "gap: 0.35rem",
        "align-items: center",
    ):
        assert prop in body, f"the base .msg-meta rhythm must keep {prop}"


# ---------------------------------------------------------------------------
# the audit (task 03 item 3) — neighbors untouched
# ---------------------------------------------------------------------------


def test_chips_row_is_untouched() -> None:
    """The chips row's look is the completed phase-26/113 surface —
    mono pill, brand-soft fill, line border, nowrap ellipsis (the
    min-width: 0 escape). Phase 130 only removed the buttons from this
    row's neighbors, never the chip's styling."""
    css = _css()
    body = _block(css, ".source-chip")
    for prop in (
        "font-family: var(--mono)",
        "background: var(--brand-soft)",
        "border: 1px solid var(--line)",
        "border-radius: 999px",
        "white-space: nowrap",
        "min-width: 0",
        "text-overflow: ellipsis",
    ):
        assert prop in body, f".source-chip must keep {prop}"
    assert ".source-chip:hover" in css


def test_related_row_is_untouched() -> None:
    """The phase-113 "Nearby docs" row keeps its de-emphasized look
    (dashed border, transparent fill, muted mono links — never a
    citation) and still joins the .msg-meta family."""
    css = _css()
    body = _block(css, ".related-doc")
    for prop in (
        "border: 1px dashed var(--line)",
        "background: transparent",
        "font-family: var(--mono)",
        "white-space: nowrap",
    ):
        assert prop in body, f".related-doc must keep {prop}"
    assert ".related-docs-label" in css
    assert "Nearby docs" not in css  # the label text lives in app.js, not CSS


def test_source_image_figure_is_untouched() -> None:
    """The ``.source-image`` figure (phase 122) was already sized for a
    row context — the 96px contain img on the theme's surface, the
    clamped muted caption. Phase 130 moves it to its OWN row, not to a
    new scale."""
    css = _css()
    assert "max-height: 96px" in _block(css, ".source-image-img"), (
        "the compact source figure keeps its 96px row-scale cap"
    )
    assert "object-fit: contain" in _block(css, ".source-image-img")
    assert "-webkit-line-clamp: 2" in _block(css, ".source-image-caption")
    # The answer figure (phase 124) is a DIFFERENT scale — untouched.
    assert "max-height: 320px" in _block(css, ".answer-image-img")


def test_mobile_pins_the_actions_row_left_nowhere() -> None:
    """The mobile squeeze (≤640px) may keep the ≥44px touch floor but
    must NOT pin the actions row left or restyle it: the cluster stays
    right-aligned at every width (the row's justify is width-agnostic,
    the .msg-body flex gap stacks the rows)."""
    css = _css()
    mobile = _media_block(css, "max-width: 640px")
    for selector in (".tune-btn", ".retry-btn", ".msg-actions", ".msg-images"):
        for m in re.finditer(re.escape(selector) + r" \{([^}]*)\}", mobile):
            body = m.group(1)
            assert "justify-content" not in body, (
                f"{selector}: the mobile block must not re-justify the "
                "cluster (the actions row stays right-aligned)"
            )
            assert "margin-left" not in body and "margin-inline" not in body, (
                f"{selector}: the mobile block must not re-margin the "
                "cluster (no left pin, no margin reset)"
            )
            assert "position" not in body
    # The mobile squeeze's only tune/retry rules are the 44px floors
    # (pre-existing, untouched by this phase).
    assert ".tune-btn { min-height: 44px; }" in mobile
    assert ".retry-btn { min-height: 44px; }" in mobile