// Tests for the goes-to-eleven fader's pure math (no DOM — mountFader owns all
// document references, so the module imports cleanly in Node).
//   node home/test/fader.test.mjs
import assert from "node:assert/strict";
import { faderLevel, faderValue } from "../web/static/fader.js";

let failures = 0;
async function test(name, fn) {
  try {
    await fn();
    console.log("PASS  " + name);
  } catch (e) {
    console.log("FAIL  " + name + "  —  " + (e && e.message));
    failures++;
  }
}

await test("faderValue maps the slot run to 1..10 and clamps beyond it", () => {
  assert.equal(faderValue(0), 1);
  assert.equal(faderValue(0.86), 10, "the end of the run (RUN_END) is 10");
  assert.equal(faderValue(1), 10, "past the run still clamps to 10 — eleven is not reachable by position");
  assert.equal(faderValue(-0.5), 1, "before the slot clamps to 1");
  assert.ok(faderValue(0.43) > 5 && faderValue(0.43) < 6.6, "mid-run lands mid-scale");
});

await test("faderLevel is silent below 5, hot by 10, and pressure adds strain", () => {
  assert.equal(faderLevel("slide", 1, 0), 0);
  assert.equal(faderLevel("slide", 5, 0), 0);
  assert.ok(Math.abs(faderLevel("slide", 10, 0) - 5 / 6) < 1e-9);
  assert.ok(faderLevel("slide", 10, 0.8) > faderLevel("slide", 10, 0), "the hold adds strain");
});

await test("faderLevel holds PAST 1.0 at the snap and through the whole build", () => {
  assert.equal(faderLevel("snap", 10, 0), 1.2);
  assert.equal(faderLevel("build", 10, 0), 1.2, "the volume stays AT eleven while building");
});

await test("faderLevel cuts to zero at done (silence before the confetti)", () => {
  assert.equal(faderLevel("done", 10, 0), 0);
});

console.log(failures ? `\n${failures} FAILED` : "\nALL PASSED");
process.exit(failures ? 1 : 0);