// server/lib/metrics.test.ts
import { test } from "node:test";
import assert from "node:assert/strict";
import { cancelRate, noShowRate, completionRate } from "./metrics.ts";

test("cancelRate: basic ratio rounded to 1 decimal", () => {
  assert.equal(cancelRate(1, 4), 25);
  assert.equal(cancelRate(3, 7), 42.9);
  assert.equal(cancelRate(0, 10), 0);
});

test("cancelRate: zero total → 0 (no NaN)", () => {
  assert.equal(cancelRate(0, 0), 0);
  assert.equal(cancelRate(5, 0), 0);
  assert.equal(cancelRate(5, -3), 0);
});

test("cancelRate: all cancelled → 100", () => {
  assert.equal(cancelRate(8, 8), 100);
});

test("noShowRate: basic ratio rounded to 1 decimal", () => {
  assert.equal(noShowRate(1, 10), 10);
  assert.equal(noShowRate(1, 3), 33.3);
  assert.equal(noShowRate(2, 9), 22.2);
});

test("noShowRate: zero total → 0", () => {
  assert.equal(noShowRate(0, 0), 0);
  assert.equal(noShowRate(3, 0), 0);
});

test("completionRate: basic ratio rounded to whole percent", () => {
  assert.equal(completionRate(7, 10), 70);
  assert.equal(completionRate(1, 3), 33);
  assert.equal(completionRate(2, 3), 67);
});

test("completionRate: zero total → 0", () => {
  assert.equal(completionRate(0, 0), 0);
  assert.equal(completionRate(5, 0), 0);
});

test("completionRate: all completed → 100", () => {
  assert.equal(completionRate(10, 10), 100);
});