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

// The SSTV panel: a picture arriving row by row, and what is kept once it has.
// Watching the image build up is the point of the mode, so rows have to reach
// the canvas as they arrive rather than at the end of a two-minute frame.

import assert from "node:assert/strict";
import test from "node:test";
import vm from "node:vm";
import { bundleEntry } from "./bundle-entry.mjs";
import { createHost } from "./host-fixture.mjs";

/** A DOM stub with only what the plugin reaches for. */
function makeElement(id) {
  const listeners = new Map();
  return {
    id,
    textContent: "",
    innerHTML: "",
    value: "",
    style: {},
    attributes: {},
    classList: {
      classes: new Set(),
      add(name) { this.classes.add(name); },
      remove(name) { this.classes.delete(name); },
      toggle(name, on) { if (on) this.classes.add(name); else this.classes.delete(name); },
      contains(name) { return this.classes.has(name); },
    },
    addEventListener(type, handler) { listeners.set(type, handler); },
    setAttribute(name, value) { this.attributes[name] = String(value); },
    getAttribute(name) { return this.attributes[name] ?? null; },
    click() { listeners.get("click")?.(); },
    fire(type, event) { listeners.get(type)?.(event); },
  };
}

function makeCanvas(id) {
  const element = makeElement(id);
  element.width = 0;
  element.height = 0;
  const painted = [];
  const fills = [];
  element.painted = painted;
  element.fills = fills;
  element.getContext = () => ({
    fillStyle: "",
    fillRect: (...args) => { fills.push(args); },
    createImageData: (width, height) => ({
      width, height, data: new Uint8ClampedArray(width * height * 4),
    }),
    putImageData: (image, x, y) => { painted.push({ x, y, data: image.data }); },
  });
  return element;
}

async function loadPanel() {
  const elements = new Map();
  const element = (id) => {
    if (!elements.has(id)) {
      elements.set(id, id.endsWith("canvas") ? makeCanvas(id) : makeElement(id));
    }
    return elements.get(id);
  };
  // Touch every id the panel defines, so the plugin caches real stubs.
  for (const id of [
    "sstv-status", "sstv-live-view", "sstv-history-view", "sstv-live-container",
    "sstv-live-info", "sstv-live-canvas", "sstv-live-latest", "sstv-history-list",
    "sstv-history-count", "sstv-filter", "sstv-sort", "sstv-decode-toggle-btn",
    "sstv-clear-btn", "sstv-view-live", "sstv-view-history",
  ]) element(id);

  const window = { ...createHost() };
  const context = vm.createContext({
    window,
    document: { getElementById: (id) => elements.get(id) ?? null },
    atob: (data) => Buffer.from(data, "base64").toString("binary"),
    Date, Number, String, Math, Set, Uint8Array, Uint8ClampedArray, JSON, console,
  });
  const runtime = await bundleEntry(new URL("../src/plugin-runtime.ts", import.meta.url));
  const source = await bundleEntry(new URL("../src/plugins/sstv.ts", import.meta.url));
  new vm.Script(runtime).runInContext(context);
  new vm.Script(source).runInContext(context);
  return { window, runtime: window.trxPluginRuntime, element };
}

/** One row of RGB triples, base64 as the server sends it. */
function rowData(width, [r, g, b]) {
  const bytes = new Uint8Array(width * 3);
  for (let x = 0; x < width; x += 1) {
    bytes[x * 3] = r;
    bytes[x * 3 + 1] = g;
    bytes[x * 3 + 2] = b;
  }
  return Buffer.from(bytes).toString("base64");
}

test("a picture arriving paints its rows as they come", async () => {
  const { runtime, element } = await loadPanel();

  // The header names the mode and the geometry; the canvas takes both.
  runtime.dispatch("sstv_progress", {
    state: "Receiving Martin M1", mode: "Martin M1", width: 320, height: 256, line: 0,
  });
  const canvas = element("sstv-live-canvas");
  assert.equal(canvas.width, 320, "the canvas did not take the mode's width");
  assert.equal(canvas.height, 256, "the canvas did not take the mode's height");
  assert.equal(element("sstv-live-container").style.display, "",
    "the live view stayed hidden while a picture was arriving");
  assert.match(element("sstv-status").textContent, /Martin M1/);

  // Rows land at the line number they carry, not in arrival order: a decoder
  // that painted them in sequence would shear a picture with a dropped line.
  runtime.dispatch("sstv_progress", { line: 4, line_data: rowData(320, [255, 0, 0]) });
  runtime.dispatch("sstv_progress", { line: 2, line_data: rowData(320, [0, 0, 255]) });
  assert.deepEqual(canvas.painted.map((p) => p.y), [4, 2],
    `rows painted at ${canvas.painted.map((p) => p.y).join(",")}`);
  assert.deepEqual([...canvas.painted[0].data.slice(0, 4)], [255, 0, 0, 255], "row 4 is not red");
  assert.deepEqual([...canvas.painted[1].data.slice(0, 4)], [0, 0, 255, 255], "row 2 is not blue");
  assert.match(element("sstv-live-info").textContent, /Martin M1/);
});

test("a received picture is kept, shown, and linked by file name alone", async () => {
  const { runtime, element } = await loadPanel();

  // Recent, not a fixed date: the panel drops anything older than the history
  // retention window, so a picture stamped with the day the test was written
  // passes until that day is a day ago.
  runtime.dispatch("sstv", {
    ts_ms: Date.now() - 60_000,
    vis: 44, mode: "Martin M1", width: 320, height: 256, lines: 256, complete: true,
    path: "/home/op/.cache/trx-rs/sstv/SSTV_20260805T120000Z_14230000_Martin-M1.png",
  });

  const latest = element("sstv-live-latest").innerHTML;
  assert.match(latest, /Martin M1/);
  assert.match(latest, /complete/);
  // The server serves pictures by file name; the path it stored is its own.
  assert.match(latest, /\/sstv-images\/SSTV_20260805T120000Z_14230000_Martin-M1\.png/);
  assert.doesNotMatch(latest, /home\/op/, "the server's filesystem path reached the page");

  element("sstv-view-history").click();
  const history = element("sstv-history-list").innerHTML;
  assert.match(history, /Martin M1/);
  assert.match(history, /320×256/);
  assert.match(element("sstv-history-count").textContent, /1 picture/);
});

test("a picture cut short is kept, and says so", async () => {
  const { runtime, element } = await loadPanel();

  runtime.dispatch("sstv", {
    ts_ms: Date.now(), vis: 60, mode: "Scottie S1", width: 320, height: 256,
    lines: 91, complete: false, path: "/cache/SSTV_x_Scottie-S1.png",
  });

  assert.match(element("sstv-status").textContent, /Partial/);
  element("sstv-view-history").click();
  assert.match(element("sstv-history-list").innerHTML, /91 \(partial\)/);
});

test("clearing empties the panel", async () => {
  const { runtime, element } = await loadPanel();
  runtime.dispatch("sstv", { ts_ms: Date.now(), mode: "PD120", lines: 496, complete: true });
  assert.match(element("sstv-live-latest").innerHTML, /PD120/);

  runtime.reset("sstv");
  assert.equal(element("sstv-live-latest").innerHTML, "");
  assert.equal(element("sstv-status").textContent, "Idle");
  assert.equal(element("sstv-live-container").style.display, "none");
});

test("the toggle button follows the rig state", async () => {
  const { window, element } = await loadPanel();
  const button = element("sstv-decode-toggle-btn");

  window.syncSstvToggle(true);
  assert.equal(button.textContent, "Disable SSTV");
  assert.equal(button.getAttribute("aria-pressed"), "true");

  window.syncSstvToggle(false);
  assert.equal(button.textContent, "Enable SSTV");
  assert.equal(button.getAttribute("aria-pressed"), "false");
});