// Run with: npm run test:mime
import test from "node:test";
import assert from "node:assert/strict";
import {
  extOf,
  mimeFromFilename,
  resolveMime,
  categoryFromMime,
} from "./mime.mjs";

test("extOf returns lowercased extension", () => {
  assert.equal(extOf("Photo.JPG"), "jpg");
  assert.equal(extOf("doc.tar.gz"), "gz");
});

test("extOf handles missing or trailing-dot names", () => {
  assert.equal(extOf(""), "");
  assert.equal(extOf(null), "");
  assert.equal(extOf("no-extension"), "");
  assert.equal(extOf("trailing."), "");
});

test("mimeFromFilename recognises known types", () => {
  assert.equal(mimeFromFilename("vision.pdf"), "application/pdf");
  assert.equal(mimeFromFilename("budget.XLSX"),
    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
  assert.equal(mimeFromFilename("logo.PNG"), "image/png");
});

test("mimeFromFilename returns null for unknown extensions", () => {
  assert.equal(mimeFromFilename("archive.zip"), null);
  assert.equal(mimeFromFilename("readme"), null);
});

test("resolveMime trusts an explicit non-octet mime", () => {
  assert.equal(resolveMime("application/pdf", "anything.txt"), "application/pdf");
});

test("resolveMime falls back to filename when explicit is missing", () => {
  assert.equal(resolveMime(undefined, "report.pdf"), "application/pdf");
  assert.equal(resolveMime(null, "image.gif"), "image/gif");
});

test("resolveMime falls back to filename when explicit is octet-stream", () => {
  assert.equal(
    resolveMime("application/octet-stream", "spreadsheet.xlsx"),
    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
  );
});

test("resolveMime returns octet-stream when nothing is known", () => {
  assert.equal(resolveMime(null, null), "application/octet-stream");
  assert.equal(resolveMime(undefined, "unknownfile"), "application/octet-stream");
});

test("categoryFromMime: image", () => {
  assert.equal(categoryFromMime("image/png"), "image");
  assert.equal(categoryFromMime("image/webp"), "image");
});

test("categoryFromMime: pdf", () => {
  assert.equal(categoryFromMime("application/pdf"), "pdf");
});

test("categoryFromMime: office variants", () => {
  assert.equal(categoryFromMime("application/msword"), "office");
  assert.equal(
    categoryFromMime("application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
    "office",
  );
  assert.equal(categoryFromMime("application/vnd.ms-excel"), "office");
  assert.equal(
    categoryFromMime("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
    "office",
  );
});

test("categoryFromMime: other", () => {
  assert.equal(categoryFromMime("application/zip"), "other");
  assert.equal(categoryFromMime("text/plain"), "other");
  assert.equal(categoryFromMime("application/octet-stream"), "other");
});