from __future__ import annotations

import subprocess
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[1]


def _run_node(script: str) -> str:
    """Execute a short Node.js script and return stdout."""
    completed = subprocess.run(
        ["node", "-e", script],
        cwd=REPO_ROOT,
        capture_output=True,
        text=True,
        encoding="utf-8",
        check=True,
    )
    return completed.stdout.strip()


def test_metric_presenter_applies_thresholds_and_noise_direction() -> None:
    """MetricPresenter should centralize thresholds and inverse noise semantics."""
    metric_js = (REPO_ROOT / "webapp" / "static" / "js" / "metric_presenter.js").as_posix()
    script = f"""
const fs = require("fs");
const vm = require("vm");
const code = fs.readFileSync("{metric_js}", "utf8");
const sandbox = {{ window: {{}}, console }};
vm.runInNewContext(code, sandbox);
const p = sandbox.window.MetricPresenter;
const result = {{
  faith085: p.scoreClass("faithfulness", 0.85),
  faith070: p.scoreClass("faithfulness", 0.70),
  faith064: p.scoreClass("faithfulness", 0.64),
  noise010: p.scoreClass("noise_sensitivity", 0.10),
  noise030: p.scoreClass("noise_sensitivity", 0.30),
  noise050: p.scoreClass("noise_sensitivity", 0.50),
  desc: p.describeMetric("faithfulness"),
  noiseDesc: p.describeMetric("noise_sensitivity"),
  noiseBin: p.binColor("noise_sensitivity", 0.0),
  faithBin: p.binColor("faithfulness", 0.8)
}};
console.log(JSON.stringify(result));
"""
    output = _run_node(script)
    assert '"faith085":"good"' in output
    assert '"faith070":"warn"' in output
    assert '"faith064":"bad"' in output
    assert '"noise010":"good"' in output
    assert '"noise030":"warn"' in output
    assert '"noise050":"bad"' in output
    assert '"desc":"' in output
    assert '"noiseDesc":"' in output
    assert '"noiseBin":"#16a34a"' in output
    assert '"faithBin":"#16a34a"' in output


def test_report_and_index_load_metric_presenter_helper() -> None:
    """The report page should use the shared helper for card descriptions and colors."""
    index_html = (REPO_ROOT / "webapp" / "static" / "index.html").read_text(encoding="utf-8")
    report_js = (REPO_ROOT / "webapp" / "static" / "js" / "report.js").read_text(encoding="utf-8")
    app_js = (REPO_ROOT / "webapp" / "static" / "js" / "app.js").read_text(encoding="utf-8")

    assert "js/metric_presenter.js" in index_html
    assert "MetricPresenter.describeMetric" in report_js
    assert "MetricPresenter.scoreClass" in app_js