import { test } from "node:test";
import assert from "node:assert/strict";
import { buildSummary, formatBytes, formatDuration } from "../src/utils/summary.js";

test("formatBytes scales units", () => {
  assert.equal(formatBytes(0), "0 B");
  assert.equal(formatBytes(512), "512 B");
  assert.equal(formatBytes(2048), "2.00 KB");
  assert.equal(formatBytes(5 * 1024 * 1024), "5.00 MB");
  assert.equal(formatBytes(3 * 1024 ** 3), "3.00 GB");
});

test("formatDuration formats ranges", () => {
  assert.equal(formatDuration(250), "250ms");
  assert.equal(formatDuration(1500), "2s");
  assert.equal(formatDuration(65_000), "1m5s");
  assert.equal(formatDuration(3_725_000), "1h2m5s");
});

test("buildSummary includes counters and rate", () => {
  const out = buildSummary({
    totalFound: 100,
    attachmentGuids: 40,
    ok: 80,
    skipped: 10,
    failed: 10,
    bytes: 1024,
    elapsedMs: 5000,
    outputDir: "/tmp/out",
  });
  assert.match(out, /URLs found in dump : 100 \(40 attachment GUIDs\)/);
  assert.match(out, /✓ Downloaded\s*: 80/);
  assert.match(out, /↷ Skipped\s*\(exists\)\s*: 10/);
  assert.match(out, /✗ Failed\s*: 10/);
  assert.match(out, /Success rate\s*: 80%/);
  assert.match(out, /1\.00 KB/);
  assert.match(out, /5s/);
  assert.match(out, /\/tmp\/out/);
});

test("buildSummary lists failures with truncation", () => {
  const failures = Array.from({ length: 12 }, (_, i) => ({
    url: `https://x.test/f${i}.jpg`,
    reason: "no_snapshot",
  }));
  const out = buildSummary({
    totalFound: 12,
    attachmentGuids: 0,
    ok: 0,
    skipped: 0,
    failed: 12,
    bytes: 0,
    elapsedMs: 100,
    outputDir: "/o",
    failures,
    maxFailuresShown: 5,
  });
  assert.match(out, /f0\.jpg/);
  assert.match(out, /f4\.jpg/);
  assert.ok(!out.includes("f5.jpg"));
  assert.match(out, /and 7 more/);
});

test("buildSummary omits manifest line when not provided", () => {
  const out = buildSummary({
    totalFound: 1,
    attachmentGuids: 0,
    ok: 1,
    skipped: 0,
    failed: 0,
    bytes: 100,
    elapsedMs: 10,
    outputDir: "/o",
  });
  assert.ok(!out.includes("Manifest"));
});

test("buildSummary handles 0 processed", () => {
  const out = buildSummary({
    totalFound: 0,
    attachmentGuids: 0,
    ok: 0,
    skipped: 0,
    failed: 0,
    bytes: 0,
    elapsedMs: 5,
    outputDir: "/o",
  });
  assert.match(out, /Success rate\s*: n\/a/);
});