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";
import {
  MAILTO_TARGET,
  buildContactMailto,
  handleContactSubmit,
  readFormValues,
} from "../js/contact.js";

const root = join(dirname(fileURLToPath(import.meta.url)), "..");
const contactHtml = readFileSync(join(root, "contact.html"), "utf8");
const indexHtml = readFileSync(join(root, "index.html"), "utf8");

/** Minimal stand-in for a DOM form (has querySelectorAll("[name]")). */
function fakeForm(values) {
  return {
    querySelectorAll(selector) {
      assert.equal(selector, "[name]");
      return Object.entries(values).map(([name, value]) => ({ name, value }));
    },
  };
}

// ---------------------------------------------------------------------------
// Component tests: the contact page renders the three required fields
// ---------------------------------------------------------------------------

test("contact page renders a form with name, email, and message fields", () => {
  assert.match(contactHtml, /<form[^>]*id="contact-form"/);
  assert.match(contactHtml, /<input[^>]*type="text"[^>]*id="name"[^>]*name="name"/);
  assert.match(contactHtml, /<input[^>]*type="email"[^>]*id="email"[^>]*name="email"/);
  assert.match(contactHtml, /<textarea[^>]*id="message"[^>]*name="message"/);
});

test("all three contact form fields are required", () => {
  assert.match(contactHtml, /<input[^>]*id="name"[^>]*required/);
  assert.match(contactHtml, /<input[^>]*id="email"[^>]*required/);
  assert.match(contactHtml, /<textarea[^>]*id="message"[^>]*required/);
});

test("contact page loads the module that wires form submission", () => {
  assert.match(contactHtml, /<script[^>]*type="module"[^>]*src="js\/contact\.js"/);
});

// ---------------------------------------------------------------------------
// Component tests: the page is linked from site navigation
// ---------------------------------------------------------------------------

test("home page nav links to the contact page", () => {
  assert.match(indexHtml, /<a href="contact\.html">Contact<\/a>/);
  assert.match(indexHtml, /class="nav-links"/);
});

test("contact page nav marks the contact link as the current page", () => {
  assert.match(contactHtml, /<a href="contact\.html"[^>]*aria-current="page"[^>]*>Contact<\/a>/);
});

// ---------------------------------------------------------------------------
// Unit tests: submitting the form opens the mail client pre-filled
// ---------------------------------------------------------------------------

test("buildContactMailto pre-fills subject and body from entered values", () => {
  const url = buildContactMailto(
    { name: "Ada Lovelace", email: "ada@example.com", message: "Hi there!" },
    "owner@example.com"
  );

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

  const params = new URL(url).searchParams;
  assert.equal(params.get("subject"), "Contact form submission from Ada Lovelace");
  assert.match(params.get("body"), /Name: Ada Lovelace/);
  assert.match(params.get("body"), /Email: ada@example\.com/);
  assert.match(params.get("body"), /Hi there!/);
});

test("buildContactMailto defaults to the configured mailto target", () => {
  const url = buildContactMailto({ name: "A", email: "a@b.c", message: "m" });
  assert.ok(url.startsWith(`mailto:${MAILTO_TARGET}?`));
});

test("readFormValues collects name, email, and message", () => {
  const values = readFormValues(fakeForm({ name: "N", email: "E", message: "M" }));
  assert.deepEqual(values, { name: "N", email: "E", message: "M" });
});

test("handleContactSubmit navigates the visitor to the built mailto URL", () => {
  const form = fakeForm({
    name: "Grace Hopper",
    email: "grace@example.com",
    message: "Hello!",
  });
  const navigated = [];

  const url = handleContactSubmit(form, {
    to: "owner@example.com",
    navigate: (target) => navigated.push(target),
  });

  assert.equal(navigated.length, 1);
  assert.ok(navigated[0].startsWith("mailto:owner@example.com?"));
  assert.equal(navigated[0], url);

  const params = new URL(navigated[0]).searchParams;
  assert.match(params.get("body"), /Grace Hopper/);
});