// The sleep and walk trends draw the selected day against yesterday and the
// window average. A day marked "not counted" has to be absent from all three,
// and the one that kept slipping through was the selected day itself — it is
// the boldest line on the panel, so it reads as the answer.
import { load } from "./extract.mjs";
import { suite, eq, ok, report } from "./assert.mjs";

const DAY = 86_400_000;
const SEL = new Date(2026, 8, 20);          // the day under the cursor
const at = (day, hour) => new Date(2026, 8, day, hour).getTime();

let excluded = new Set();
let windowDays = 7;

const curves = load({
  names: ["startOfDay", "pairWindows", "sleepWindows", "sleepTrendCurves"],
  stubs: {
    selectedDay: () => SEL,
    ymd: (d) => `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`,
    isExcluded: (d) => excluded.has(d.getDate()),
    chartDays: () => windowDays,
  },
});

// A night's sleep on each of several days, so every curve has something to draw.
const slept = (day, fromHour, toHour) => ([
  { id: `s${day}a`, type: "sleep-start", at: at(day, fromHour) },
  { id: `s${day}b`, type: "sleep-end",   at: at(day, toHour) },
]);
const week = [16, 17, 18, 19, 20].flatMap(d => slept(d, 1, 5));

suite("the selected day's own curve");
{
  excluded = new Set();
  const c = curves.sleepTrendCurves(week);
  ok(c.today && c.today.length > 1, "a normal day is drawn");
  eq(c.dayExcluded, false, "…and not flagged as excluded");

  excluded = new Set([20]); // the selected day
  const m = curves.sleepTrendCurves(week);
  eq(m.today, null, "a day marked 'not counted' is not drawn at all");
  eq(m.dayExcluded, true, "…and says so, so the legend can drop its chip");
  eq(m.projected, null, "…and nothing is projected from a curve that isn't there");
  ok(m.avg && m.avg.length > 1, "the average it would have been read against survives");
  ok(m.yesterday && m.yesterday.length > 1, "so does yesterday");
}

suite("the comparison day and the average");
{
  excluded = new Set([19]); // yesterday, relative to the 20th
  const c = curves.sleepTrendCurves(week);
  eq(c.yesterday, null, "a marked yesterday is dropped rather than drawn flat");
  ok(c.today && c.today.length > 1, "the selected day is unaffected by it");

  // Every day but the selected one marked: nothing left to average over.
  excluded = new Set([16, 17, 18, 19]);
  const none = curves.sleepTrendCurves(week);
  eq(none.avg, null, "an average with no days left to average is null, not zero");
  ok(none.today && none.today.length > 1, "…and the selected day still draws");
}

suite("a marked day never contributes to the average");
{
  // The 19th sleeps far longer than the rest. With it counted the average is
  // dragged up; marked, it should leave no trace.
  const lopsided = [...[16, 17, 18].flatMap(d => slept(d, 1, 3)), ...slept(19, 1, 23), ...slept(20, 1, 3)];
  windowDays = 7;

  excluded = new Set();
  const withIt = curves.sleepTrendCurves(lopsided).avg[24].y;
  excluded = new Set([19]);
  const without = curves.sleepTrendCurves(lopsided).avg[24].y;
  ok(withIt > without, "marking the outlier lowers the average it was inflating");
  eq(Math.round(without), 2, "…back to the two hours the remaining days actually slept");
}

export default report("trend-curves");