// node --test site/lib/leaderboard.test.mjs   (the /live weight leaderboard, 7 October 2026: top 10 by default, a toggle
// "Show top 20" then "Show all N", the viewer's own key pinned below the ten when it sits outside them)
import { test } from 'node:test';
import assert from 'node:assert/strict';
import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, join } from 'node:path';
const here = dirname(fileURLToPath(import.meta.url));
const load = (p) => { const mod = { exports: {} }; new Function('module', 'window', readFileSync(p, 'utf8'))(mod, undefined); return mod.exports; };
const L = load(join(here, '../leaderboard.js'));
const keys = Array.from({ length: 41 }, (_, i) => ({ id: 'k' + String(i + 1).padStart(2, '0'), blocks: 1000 - i * 20, voter: true, participation: 1 }));

test('top 10 by default, the toggle reads Show top 20, then Show all 41 with the live count, then back to Show top 10', () => {
  const a = L.rows(keys, 10, null);
  assert.equal(a.rows.length, 10); assert.equal(a.rows[0].rank, 1); assert.equal(a.rows[9].rank, 10); assert.equal(a.pinned, null);
  assert.equal(a.toggle.label, 'Show top 20'); assert.equal(a.toggle.next, 20);
  const b = L.rows(keys, 20, null); assert.equal(b.rows.length, 20); assert.equal(b.toggle.label, 'Show all 41'); assert.equal(b.toggle.next, 41);
  const c = L.rows(keys, 41, null); assert.equal(c.rows.length, 41); assert.equal(c.toggle.label, 'Show top 10'); assert.equal(c.toggle.next, 10);
  assert.equal(L.rows(keys.slice(0, 8), 10, null).toggle, null, 'no toggle when the ten hold everyone');
  assert.equal(L.rows(keys.slice(0, 15), 10, null).toggle.label, 'Show all 15', 'between 10 and 20 the second step is the whole list');
});

test('the viewer\'s own key is always visible: inside the ten as its row, outside them as a pinned extra row with its true rank', () => {
  const inside = L.rows(keys, 10, 'k03'); assert.equal(inside.pinned, null); assert.ok(inside.rows.some((r) => r.id === 'k03' && r.you));
  const outside = L.rows(keys, 10, 'k27'); assert.equal(outside.rows.length, 10); assert.equal(outside.pinned.id, 'k27'); assert.equal(outside.pinned.rank, 27); assert.equal(outside.pinned.you, true);
  assert.equal(L.rows(keys, 41, 'k27').pinned, null, 'shown in the full list, so not pinned twice');
  assert.equal(L.rows(keys, 10, 'zz').pinned, null, 'a key not in the table pins nothing');
});