import test from "node:test";
import assert from "node:assert/strict";
import { buildMailtoUrl } from "../js/mailto.js";

test("builds a plain mailto URL when there is no subject or body", () => {
  assert.equal(buildMailtoUrl({ to: "ada@example.com" }), "mailto:ada@example.com");
});

test("includes subject and body as URL-encoded query parameters", () => {
  const url = buildMailtoUrl({
    to: "owner@example.com",
    subject: "Hello, Ada!",
    body: "Line one\nLine two & <more>",
  });

  assert.ok(url.startsWith("mailto:owner@example.com?"));

  const params = new URL(url).searchParams;
  assert.equal(params.get("subject"), "Hello, Ada!");
  assert.equal(params.get("body"), "Line one\nLine two & <more>");
});

test("omits empty subject and body", () => {
  const url = buildMailtoUrl({ to: "owner@example.com", subject: "", body: "" });
  assert.equal(url, "mailto:owner@example.com");
});

test("encodes spaces and special characters so the mail client opens pre-filled", () => {
  const url = buildMailtoUrl({ to: "o@example.com", subject: "a b", body: "x&y=z" });
  const params = new URL(url).searchParams;
  assert.equal(params.get("subject"), "a b");
  assert.equal(params.get("body"), "x&y=z");
});