"""Tests for per-tool-output bounding."""

from __future__ import annotations

from strix.tools.output_store import bound_text


def test_small_output_passes_through_unchanged() -> None:
    text = "line 1\nline 2\nline 3"
    assert bound_text(text, max_lines=100, max_bytes=10_000) == text


def test_line_limit_keeps_head_and_tail() -> None:
    text = "\n".join(str(i) for i in range(1000))
    bounded = bound_text(text, max_lines=10, max_bytes=1_000_000)

    assert bounded.startswith("0\n1\n2\n3\n4")
    assert bounded.rstrip().endswith("999")
    assert "truncated" in bounded
    # Head + tail only, far fewer than the original 1000 lines.
    assert len(bounded.splitlines()) < 30


def test_byte_limit_enforced_on_single_long_line() -> None:
    text = "x" * 100_000
    bounded = bound_text(text, max_lines=2_000, max_bytes=1_000)

    assert "truncated" in bounded
    assert len(bounded.encode("utf-8")) < 3_000


def test_multibyte_characters_not_split() -> None:
    text = "😀" * 50_000
    bounded = bound_text(text, max_lines=2_000, max_bytes=1_000)

    # Must remain valid UTF-8 (no broken surrogate halves from a mid-char cut).
    assert bounded == bounded.encode("utf-8").decode("utf-8")
    assert "truncated" in bounded


def test_notice_reports_dropped_counts() -> None:
    text = "\n".join("y" * 10 for _ in range(500))
    bounded = bound_text(text, max_lines=10, max_bytes=1_000_000)

    assert "lines" in bounded
    assert "bytes" in bounded