import { test } from "node:test";
import assert from "node:assert/strict";
import {
  compareVersions,
  countUnreleasedBullets,
  cutRelease,
  dateISOProblem,
  getLatestRelease,
  hasUnreleasedHeading,
  suggestNextMinorVersion,
  suggestNextVersion,
} from "./changelog";

// Run with:
//   pnpm --filter yt-dlp-transcript-common exec tsx --test lib/changelog.test.ts

const SOURCE = [
  "# Changelog",
  "",
  "## [Unreleased]",
  "- **One.** A bullet that runs long, on one line as this repo writes them.",
  "- **Two.**",
  "  - a nested item is not a change of its own",
  "* **Three.**",
  "",
  "## [0.9.0] - 2026-09-26",
  "- released",
  "",
  "## [0.8.7] - 2026-08-12",
  "- older",
].join("\n");

test("suggestNextMinorVersion bumps the minor and zeroes the patch", () => {
  assert.equal(suggestNextMinorVersion("0.9.3"), "0.10.0");
  assert.equal(suggestNextMinorVersion("1.2.0-rc.1"), "1.3.0");
  assert.equal(suggestNextMinorVersion(null), "0.1.0");
  assert.equal(suggestNextMinorVersion("garbage"), "0.1.0");
  // The patch bump is unchanged.
  assert.equal(suggestNextVersion("0.9.0"), "0.9.1");
});

test("compareVersions is semver precedence: X.Y.Z numerically, a release above its prereleases", () => {
  assert.ok(compareVersions("0.10.0", "0.9.9") > 0);
  assert.ok(compareVersions("0.8.7", "0.9.0") < 0);
  assert.equal(compareVersions("0.9.0", "0.9.0"), 0);
  assert.ok(compareVersions("1.0.0", "1.0.0-rc.1") > 0);
  assert.ok(compareVersions("1.0.0-rc.1", "0.9.0") > 0);
  assert.ok(compareVersions("0.9.0-rc.1", "0.9.0") < 0);
  assert.ok(compareVersions("1.0.0-rc.2", "1.0.0-rc.10") < 0);
  assert.ok(compareVersions("1.0.0-alpha", "1.0.0-alpha.1") < 0);
  assert.ok(compareVersions("1.0.0-1", "1.0.0-alpha") < 0);
  assert.ok(compareVersions("1.0.0-beta", "1.0.0-alpha") > 0);
  assert.ok(compareVersions("0.1.0", null) > 0);
  assert.ok(compareVersions(null, "0.1.0") < 0);
  assert.equal(compareVersions(null, null), 0);
});

test("dateISOProblem wants YYYY-MM-DD and a day on the calendar", () => {
  assert.equal(dateISOProblem("2026-09-26"), null);
  assert.equal(dateISOProblem("2024-02-29"), null);
  assert.equal(dateISOProblem("26/09/2026"), 'Date "26/09/2026" is not in YYYY-MM-DD form.');
  assert.equal(dateISOProblem("2026-13-45"), 'Date "2026-13-45" is not a calendar date.');
  assert.equal(dateISOProblem("2026-02-30"), 'Date "2026-02-30" is not a calendar date.');
  assert.equal(dateISOProblem("2025-02-29"), 'Date "2025-02-29" is not a calendar date.');
  assert.equal(dateISOProblem("2026-00-10"), 'Date "2026-00-10" is not a calendar date.');
});

test("cutRelease refuses an impossible date and a version that does not move forward", () => {
  assert.throws(() => cutRelease(SOURCE, "0.9.1", "2026-13-45"), /"2026-13-45" is not a calendar date/);
  assert.throws(
    () => cutRelease(SOURCE, "0.9.0", "2026-09-26"),
    /^CutReleaseError: Version 0\.9\.0 is not newer than the latest release, 0\.9\.0\.$/,
  );
  assert.throws(() => cutRelease(SOURCE, "0.8.9", "2026-09-26"), /not newer than the latest release, 0\.9\.0/);
  assert.throws(() => cutRelease(SOURCE, "0.9.0-rc.1", "2026-09-26"), /not newer/);
  // A prerelease of a later version is forward; so is the first release of all.
  assert.match(cutRelease(SOURCE, "1.0.0-rc.1", "2026-09-26"), /^## \[1\.0\.0-rc\.1\] - 2026-09-26$/m);
  assert.match(
    cutRelease("# Changelog\n\n## [Unreleased]\n- first\n", "0.1.0", "2026-09-26"),
    /^## \[0\.1\.0\] - 2026-09-26$/m,
  );
});

test("getLatestRelease reads the newest released heading and its date", () => {
  assert.deepEqual(getLatestRelease(SOURCE), { version: "0.9.0", date: "2026-09-26" });
  assert.deepEqual(getLatestRelease("## [1.0.0]\n- undated\n"), {
    version: "1.0.0",
    date: null,
  });
  assert.equal(getLatestRelease("# Changelog\n\n## [Unreleased]\n- x\n"), null);
});

test("countUnreleasedBullets counts the top-level bullets under [Unreleased] only", () => {
  assert.equal(countUnreleasedBullets(SOURCE), 3);
  assert.equal(countUnreleasedBullets("## [Unreleased]\n\n## [0.1.0] - 2026-01-01\n- x\n"), 0);
  assert.equal(countUnreleasedBullets("## [0.1.0] - 2026-01-01\n- x\n"), 0);
  assert.equal(hasUnreleasedHeading(SOURCE), true);
  assert.equal(hasUnreleasedHeading("## [0.1.0] - 2026-01-01\n- x\n"), false);
});