#!/usr/bin/env python3
"""Adversarial tests for lint-skin.py's accessible-SVG contract."""

from __future__ import annotations

import subprocess
import sys
import tempfile
from pathlib import Path


ROOT = Path(__file__).resolve().parent.parent
LINTER = ROOT / "scripts/lint-skin.py"

VALID_SVG = """\
<svg xmlns="http://www.w3.org/2000/svg" role="img"
     aria-labelledby="fixture-title fixture-desc">
  <title id="fixture-title">Fixture diagram</title>
  <desc id="fixture-desc">Diagram showing a fixture connected to a result.</desc>
  <rect width="10" height="10"/>
</svg>
"""


def run_linter(path: Path) -> subprocess.CompletedProcess[str]:
    return subprocess.run(
        [sys.executable, str(LINTER), str(path)],
        capture_output=True,
        text=True,
        check=False,
    )


def require_failure(name: str, html: str, expected: str, directory: Path) -> None:
    path = directory / f"{name}.html"
    path.write_text(html, encoding="utf-8")
    result = run_linter(path)
    if result.returncode != 1:
        raise AssertionError(
            f"{name}: expected exit 1, got {result.returncode}\n{result.stdout}{result.stderr}"
        )
    if f"a11y: {expected}" not in result.stdout:
        raise AssertionError(
            f"{name}: missing expected a11y finding {expected!r}\n{result.stdout}"
        )
    print(f"OK: {name} rejected — {expected}")


def require_pass(name: str, html: str, directory: Path) -> None:
    path = directory / f"{name}.html"
    path.write_text(html, encoding="utf-8")
    result = run_linter(path)
    if result.returncode != 0:
        raise AssertionError(
            f"{name}: expected exit 0, got {result.returncode}\n{result.stdout}{result.stderr}"
        )
    if "a11y:" in result.stdout:
        raise AssertionError(f"{name}: unexpected a11y finding\n{result.stdout}")
    print(f"OK: {name} accepted")


def main() -> int:
    with tempfile.TemporaryDirectory(prefix="lint-a11y-") as temp_dir:
        directory = Path(temp_dir)

        require_failure(
            "missing-role",
            VALID_SVG.replace(' role="img"', ""),
            'diagram <svg> must carry role="img"',
            directory,
        )
        require_failure(
            "unresolved-labelled-by",
            VALID_SVG.replace(
                'aria-labelledby="fixture-title fixture-desc"',
                'aria-labelledby="absent-title absent-desc"',
            ),
            "aria-labelledby references missing id(s): absent-title, absent-desc",
            directory,
        )
        require_failure(
            "labels-unrelated-elements",
            VALID_SVG.replace(' id="fixture-title"', "")
            .replace(' id="fixture-desc"', "")
            .replace(
                '  <rect width="10" height="10"/>',
                '  <g id="fixture-title"></g>\n'
                '  <g id="fixture-desc"></g>\n'
                '  <rect width="10" height="10"/>',
            ),
            "aria-labelledby must name the <title> and <desc> IDs",
            directory,
        )
        require_failure(
            "late-title",
            VALID_SVG.replace(
                '  <title id="fixture-title">Fixture diagram</title>\n  <desc',
                '  <defs></defs>\n  <title id="fixture-title">Fixture diagram</title>\n  <desc',
            ),
            "<title> must be the first child element of <svg>",
            directory,
        )
        require_failure(
            "empty-desc",
            VALID_SVG.replace(
                "Diagram showing a fixture connected to a result.", "  "
            ),
            "<desc> must not be empty",
            directory,
        )
        require_failure(
            "bare-ids",
            VALID_SVG.replace("fixture-title", "title").replace(
                "fixture-desc", "desc"
            ),
            'bare id="title" and id="desc" are not allowed',
            directory,
        )
        require_pass(
            "decorative",
            '<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true">'
            '<path d="M0 0h1v1z"/></svg>\n',
            directory,
        )

    print("All accessible-SVG lint cases passed.")
    return 0


if __name__ == "__main__":
    sys.exit(main())