"""Unit: phase-66 text pins — the History tab describes the auto-save
model, not the retired Save button.

House pattern (``test_stale_ui_copy.py``): read ``frontend/history.html``
as text and assert substrings — no browser. The browser-visible layer is
gated by the dedicated story suite (``tests/e2e/test_history_copy.py``);
these pins catch a silent regression in the template without it.

Locked decision (owner-locked A3, 2026-09-01): every conversation saves
itself automatically — there is NO Save button (retired phase 55, owner-
locked A2, pinned by ``test_save_share_ux.py::test_anonymous_auto_save``),
so no user-visible History-tab string may name one.
"""
from __future__ import annotations

import re
from pathlib import Path

FRONTEND = Path(__file__).resolve().parents[2] / "frontend"

# --- the locked auto-save copy (owner-locked A3) -----------------------

META = "Saved chats — every conversation is saved automatically, one click back."
PAGE_SUB = (
    "Every conversation is saved automatically — newest activity first. "
    "Click a title to return to that chat."
)
EMPTY_ROW = "No saved chats yet — start a conversation and it will be saved automatically."

# --- the retired manual-save copy (must be nowhere) --------------------

OLD_META = "every conversation you saved"
OLD_PAGE_SUB = "you pressed <strong>Save</strong>"
OLD_EMPTY_ROW = "press <strong>Save</strong> in the chat"

# --- state-language survivors (must STAY — "saved" is a state, not a
#     button; their absence would prove over-deletion) ------------------

STATE_STRINGS = (
    "<h1>Saved chats</h1>",
    "Sign in to view your saved chats",
    "Saved conversations are admin-only",
)


def _text() -> str:
    return (FRONTEND / "history.html").read_text(encoding="utf-8")


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


def test_manual_save_copy_is_gone() -> None:
    """history.html: the three retired manual-save strings are GONE —
    the copy no longer tells the visitor to press a Save button."""
    html = _text()
    for frag in (OLD_META, OLD_PAGE_SUB, OLD_EMPTY_ROW):
        assert frag not in html, f"retired manual-save copy still present: {frag!r}"


def test_locked_auto_save_copy_present_exactly_once() -> None:
    """The three locked (A3) auto-save strings, each exactly once in
    history.html (a second copy could drift out of sync)."""
    html = _norm(_text())
    assert html.count(META) == 1, "the locked meta description"
    assert html.count(PAGE_SUB) == 1, "the locked page-sub"
    assert html.count(EMPTY_ROW) == 1, "the locked empty-row string"


def test_state_language_survivors_are_untouched() -> None:
    """Proof of NO over-deletion: the strings where "saved" is a state —
    the <h1>, the anonymous gate title, and the gate sub — stay exactly
    as phase 50 wrote them."""
    html = _text()
    for frag in STATE_STRINGS:
        assert frag in html, f"state-language survivor deleted: {frag!r}"