// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
//
// SPDX-License-Identifier: GPL-2.0-or-later

// A link is how one operator tells another where to listen. Opening one has to
// put the radio there, and the address bar has to keep up with the dial after
// that — a link that goes stale the moment someone tunes is worse than none,
// because it looks like it works.

import assert from "node:assert/strict";
import { chromium } from "playwright-core";
import { startBrowser, startWebFixture } from "./web-fixture.mjs";

/* global document, window */

const LINK_HZ = 14_074_000;
const LINK_BW = 2_800;
const TUNED_HZ = 7_040_000;

const fixture = await startWebFixture({ spectrum: true });
const { browser, page, runtimeErrors } = await startBrowser(chromium);

const dial = () => page.evaluate(() => ({
  freqHz: window.lastFreqHz,
  mode: document.getElementById("mode").value,
  search: window.location.search,
  path: window.location.pathname,
}));

// Typed, not filled. The app holds back its own refreshes of the frequency
// field from the first keystroke until Enter, so that a state update arriving
// mid-edit does not rewrite what is being typed. `fill()` sets the value
// without a keystroke, leaving the field unguarded: on a slow machine a state
// update could land between the fill and the Enter and put the old frequency
// back, and the Enter would then re-apply the frequency the radio was already
// on. Selecting first arms the guard before a single character changes.
async function tuneByHand(text) {
  const field = page.locator("#freq");
  await field.click();
  await field.press("ControlOrMeta+a");
  await field.pressSequentially(text);
  await field.press("Enter");
}

try {
  await page.setViewportSize({ width: 1500, height: 950 });

  // Opening the link tunes the radio: frequency, mode and bandwidth.
  await page.goto(`${fixture.origin}/?f=14.074M&mode=USB&bw=${LINK_BW}`, { waitUntil: "domcontentloaded" });
  await page.locator("#content").waitFor({ state: "visible" });
  await page.waitForTimeout(2500);

  const opened = await dial();
  assert.equal(opened.freqHz, LINK_HZ, `the link left the radio on ${opened.freqHz} Hz`);
  assert.equal(opened.mode, "USB", `the link left the radio in ${opened.mode}`);
  const bandwidth = await page.evaluate(() => window.currentBandwidthHz);
  assert.equal(bandwidth, LINK_BW, `the link left the bandwidth at ${bandwidth} Hz`);

  // Hand-written frequencies are canonicalised in place, so what the operator
  // copies back out is the same link in the form the app writes.
  const params = new URLSearchParams(opened.search);
  assert.equal(params.get("f"), String(LINK_HZ), `the URL kept "${params.get("f")}"`);
  assert.equal(params.get("mode"), "USB");

  // Tuning by hand rewrites the link. This is the part that makes the address
  // bar shareable at any moment rather than only at load.
  await tuneByHand("7.040M");
  await page.waitForTimeout(1500);
  const tuned = await dial();
  assert.equal(tuned.freqHz, TUNED_HZ, `tuning landed on ${tuned.freqHz} Hz`);
  assert.equal(new URLSearchParams(tuned.search).get("f"), String(TUNED_HZ),
    `the URL still reads "${tuned.search}" after tuning`);

  // Tuning is not navigation: a swept dial must not bury the back button.
  const historyLength = await page.evaluate(() => window.history.length);
  await tuneByHand("7.100M");
  await page.waitForTimeout(1200);
  assert.equal(await page.evaluate(() => window.history.length), historyLength,
    "tuning pushed a history entry instead of replacing one");

  // Moving between tabs keeps the tune parameters: the path changes, the link
  // does not stop being a link.
  await page.locator('.tab[data-tab="map"]').click();
  await page.waitForTimeout(800);
  const onMap = await dial();
  assert.equal(onMap.path, "/map", `the map tab landed on ${onMap.path}`);
  assert.equal(new URLSearchParams(onMap.search).get("f"), "7100000",
    `the map tab dropped the tune parameters: "${onMap.search}"`);

  // A link naming a rig selects it before applying the rest.
  await page.goto(`${fixture.origin}/?rig=rig-b&f=${TUNED_HZ}&mode=CW`, { waitUntil: "domcontentloaded" });
  await page.locator("#content").waitFor({ state: "visible" });
  await page.waitForTimeout(2500);
  const switched = await page.evaluate(() => ({
    rig: document.getElementById("header-rig-switch-select")?.value ?? null,
    selected: window.location.search,
    mode: document.getElementById("mode").value,
  }));
  assert.equal(switched.rig, "rig-b", `the link left the client on rig "${switched.rig}"`);
  assert.equal(switched.mode, "CW", `the link left the radio in ${switched.mode}`);

  // A link with nothing to say tunes nothing, and the address bar fills in
  // with where the radio already is.
  await page.goto(fixture.origin, { waitUntil: "domcontentloaded" });
  await page.locator("#content").waitFor({ state: "visible" });
  await page.waitForTimeout(2000);
  const bare = await dial();
  assert.equal(new URLSearchParams(bare.search).get("f"), String(bare.freqHz),
    `a bare load wrote "${bare.search}" for a radio on ${bare.freqHz} Hz`);

  assert.deepEqual(runtimeErrors, []);
} finally {
  await browser.close();
  await fixture.close();
}