// The editor's surface in Chromium (Playwright), on its built page.
//
// - Every FILIUS example drawn: its devices and cables, each device as large
//   as Java made its button when it saved the file — the bounds in the files
//   saved by Java 2.5 and later (before, the button's width left the label
//   out, and older ones had other borders); the height within the font
//   heights of the saving machines (15 to 17), the width where the label is
//   wider than the icon within 16 % (the machines' fonts differ).
// - The gestures: the wheel with Ctrl zooms around the pointer, a drag moves
//   the surface, a press without moving does nothing, the buttons step and fit.
// - English and dark.

import { readdirSync, readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { expect, test, type Page } from '@playwright/test';
import { decodeJavaBeans, isJavaObject, listItems, readFlsArchive } from '@mdg-filius/fls';
import { ICONS, iconOf } from '../src/canvas/layout.js';
import { serveEditor } from './editorPage.js';

const here = dirname(fileURLToPath(import.meta.url));
const examples = join(here, '../../../corpus/java-examples');

let server: { readonly base: string; readonly close: () => Promise<void> };
let base: string;

test.beforeAll(async () => {
  server = await serveEditor();
  base = server.base;
});

test.afterAll(async () => {
  await server.close();
});

/** The width and height Java gave each device's button when it saved the file, in the file's order. */
function savedBounds(file: string): { width: number; height: number; javaClass: string; cloud: boolean }[] {
  const values = decodeJavaBeans(readFlsArchive(new Uint8Array(readFileSync(join(examples, file)))).configurationXml);
  const nodes = listItems(values[typeof values[0] === 'string' ? 1 : 0]);
  return nodes.flatMap((item) => {
    if (!isJavaObject(item)) return [];
    const label = item.properties.get('imageLabel');
    const device = item.properties.get('knoten');
    const bounds = isJavaObject(label) ? label.properties.get('bounds') : undefined;
    if (!isJavaObject(bounds) || !isJavaObject(device)) return [];
    const field = (name: string, index: number) => (bounds.properties.get(name) ?? bounds.args[index]) as number;
    return [{ width: field('width', 2), height: field('height', 3), javaClass: device.className.slice(device.className.lastIndexOf('.') + 1), cloud: device.properties.get('cloud') === true }];
  });
}

/** The version line Java wrote at the file's start. */
function savedVersion(file: string): string | undefined {
  const values = decodeJavaBeans(readFlsArchive(new Uint8Array(readFileSync(join(examples, file)))).configurationXml);
  return typeof values[0] === 'string' ? values[0] : undefined;
}

async function open(page: Page, example: string, query = '') {
  await page.goto(`${base}?example=${example}${query}`);
  await page.waitForSelector('g.device');
}

const KIND_OF_CLASS: Record<string, 'pc' | 'notebook' | 'networkSwitch' | 'router' | 'gateway' | 'remoteLink'> = {
  Rechner: 'pc',
  Notebook: 'notebook',
  Switch: 'networkSwitch',
  Vermittlungsrechner: 'router',
  Gateway: 'gateway',
  Modem: 'remoteLink',
};

test('draws every example with devices as large as Java made them', async ({ page }) => {
  const deviations: string[] = [];
  let compared = 0;
  for (const file of readdirSync(examples).filter((name) => name.endsWith('.fls'))) {
    await open(page, file);
    const saved = savedBounds(file);
    const version = /Filius version: (\d+)\.(\d+)/.exec(savedVersion(file) ?? '');
    const comparable = version !== null && (Number(version[1]) > 2 || (Number(version[1]) === 2 && Number(version[2]) >= 5));
    const devices = await page.locator('g.device').evaluateAll((elements) =>
      elements.map((element) => ({ box: element.getAttribute('data-box')!.split(' ').map(Number), label: element.getAttribute('aria-label') })),
    );
    expect(devices.length, file).toBe(saved.length);
    expect(await page.locator('path[data-link]').count(), file).toBeGreaterThan(0);
    for (const [index, { box, label }] of devices.entries()) {
      const java = saved[index]!;
      if (!comparable) continue;
      compared += 1;
      const [, , width, height] = box as [number, number, number, number];
      const icon = ICONS[iconOf(KIND_OF_CLASS[java.javaClass]!, java.cloud)];
      // The height: icon plus 5 plus Java's font height on the machine that saved it (15 to 17).
      const heightOk = height - java.height >= 0 && height - java.height <= 2;
      // The width: exact where the icon is wider than the label; else the label's width, which depends on
      // the saving machine's font (Java takes the system's look and feel): within 16 %.
      const tolerance = java.width === icon.width + 21 && width === icon.width + 21 ? 0 : Math.max(4, java.width * 0.16);
      if (!heightOk || Math.abs(width - java.width) > tolerance) deviations.push(`${file} #${index + 1} ${label}: Java ${java.width}×${java.height}, here ${width}×${height}`);
    }
  }
  expect(compared).toBeGreaterThan(80);
  expect(deviations).toEqual([]);
});

test('zooms around the pointer with Ctrl and the wheel, and moves with a drag', async ({ page }) => {
  await open(page, 'internetwork_komplett.fls');
  const zoom = () => page.locator('[data-zoom]').getAttribute('data-zoom').then(Number);
  const device = page.locator('g.device').first();
  const before = (await device.boundingBox())!;
  const start = await zoom();
  // Zoom in at the device's middle: it stays where it is, and grows.
  const point = { x: before.x + before.width / 2, y: before.y + before.height / 2 };
  await page.mouse.move(point.x, point.y);
  await page.keyboard.down('Control');
  await page.mouse.wheel(0, -100);
  await page.keyboard.up('Control');
  await expect.poll(zoom).toBeGreaterThan(start);
  const after = (await device.boundingBox())!;
  expect(Math.abs(after.x + after.width / 2 - point.x)).toBeLessThan(1.5);
  expect(Math.abs(after.y + after.height / 2 - point.y)).toBeLessThan(1.5);
  expect(after.width).toBeGreaterThan(before.width);

  // A press without moving leaves the view; a drag moves it as far as the pointer went.
  const surface = (await page.locator('svg.filius-canvas').boundingBox())!;
  const empty = { x: surface.x + 20, y: surface.y + surface.height - 20 };
  await page.mouse.move(empty.x, empty.y);
  await page.mouse.down();
  await page.mouse.up();
  expect((await device.boundingBox())!.x).toBeCloseTo(after.x, 1);
  await page.mouse.move(empty.x, empty.y);
  await page.mouse.down();
  await page.mouse.move(empty.x + 60, empty.y - 40, { steps: 6 });
  await page.mouse.up();
  const moved = (await device.boundingBox())!;
  expect(moved.x - after.x).toBeCloseTo(60, 0);
  expect(moved.y - after.y).toBeCloseTo(-40, 0);
});

test("steps with the buttons, shows all, and keeps to Java's limits", async ({ page }) => {
  await open(page, 'internetwork_komplett.fls');
  const zoom = () => page.locator('[data-zoom]').getAttribute('data-zoom').then(Number);
  await page.getByRole('button', { name: 'Vergrößern' }).click();
  expect(await zoom()).toBe(1.25);
  for (let press = 0; press < 6; press += 1) await page.getByRole('button', { name: 'Vergrößern' }).click({ force: true });
  expect(await zoom()).toBe(2);
  await expect(page.getByRole('button', { name: 'Vergrößern' })).toBeDisabled();
  await page.getByRole('button', { name: 'Alles zeigen' }).click();
  const surface = (await page.locator('svg.filius-canvas').boundingBox())!;
  for (const box of await page.locator('g.device').evaluateAll((elements) => elements.map((element) => element.getBoundingClientRect().toJSON() as DOMRect))) {
    expect(box.left).toBeGreaterThanOrEqual(surface.x);
    expect(box.right).toBeLessThanOrEqual(surface.x + surface.width);
    expect(box.top).toBeGreaterThanOrEqual(surface.y);
    expect(box.bottom).toBeLessThanOrEqual(surface.y + surface.height);
  }
  for (let press = 0; press < 8; press += 1) await page.getByRole('button', { name: 'Verkleinern' }).click({ force: true });
  expect(await zoom()).toBe(0.25);
});

test('speaks English and goes dark when asked', async ({ page }) => {
  await open(page, 'nat.fls', '&lang=en&theme=dark');
  await expect(page.getByRole('img', { name: 'Home Router: Heimrouter' })).toBeVisible();
  await expect(page.getByRole('button', { name: 'Zoom in' })).toBeVisible();
  expect(await page.evaluate(() => document.documentElement.dataset.theme)).toBe('dark');
  await expect(page.getByRole('img', { name: 'Switch / Wi-Fi: Internet' })).toBeVisible();
});

test('zooms with two fingers around their middle, and moves with one', async ({ browser }) => {
  const context = await browser.newContext({ hasTouch: true, viewport: { width: 1024, height: 768 } });
  const page = await context.newPage();
  await open(page, 'internetwork_komplett.fls');
  const zoom = () => page.locator('[data-zoom]').getAttribute('data-zoom').then(Number);
  const cdp = await context.newCDPSession(page);
  const touch = (type: 'touchStart' | 'touchMove' | 'touchEnd', points: readonly [number, number][]) =>
    cdp.send('Input.dispatchTouchEvent', { type, touchPoints: points.map(([x, y], id) => ({ x, y, id })) });
  const device = page.locator('g.device').nth(4);
  const before = (await device.boundingBox())!;
  const centre = { x: before.x + before.width / 2, y: before.y + before.height / 2 };
  const start = await zoom();
  // Two fingers 40 px either side of the device, spread to 80.
  await touch('touchStart', [
    [centre.x - 40, centre.y],
    [centre.x + 40, centre.y],
  ]);
  for (const distance of [50, 60, 70, 80]) {
    await touch('touchMove', [
      [centre.x - distance, centre.y],
      [centre.x + distance, centre.y],
    ]);
  }
  await touch('touchEnd', []);
  expect(await zoom()).toBeCloseTo(start * 2 > 2 ? 2 : start * 2, 1);
  const after = (await device.boundingBox())!;
  expect(Math.abs(after.x + after.width / 2 - centre.x)).toBeLessThan(2);
  expect(Math.abs(after.y + after.height / 2 - centre.y)).toBeLessThan(2);

  // One finger moves the surface.
  await touch('touchStart', [[500, 700]]);
  for (const step of [10, 20, 30, 40, 50]) await touch('touchMove', [[500 + step, 700]]);
  await touch('touchEnd', []);
  expect((await device.boundingBox())!.x - after.x).toBeCloseTo(50, 0);
  await context.close();
});

test('moves with the wheel alone, and takes a press that hardly moved for no drag', async ({ page }) => {
  await open(page, 'internetwork_komplett.fls');
  const zoom = () => page.locator('[data-zoom]').getAttribute('data-zoom').then(Number);
  const device = page.locator('g.device').first();
  const before = (await device.boundingBox())!;
  const start = await zoom();
  await page.mouse.move(before.x, before.y);
  await page.mouse.wheel(30, 50);
  await expect.poll(async () => (await device.boundingBox())!.y).toBeCloseTo(before.y - 50, 0);
  expect((await device.boundingBox())!.x).toBeCloseTo(before.x - 30, 0);
  expect(await zoom()).toBe(start);

  // Two pixels are a press, not a drag (DRAG_THRESHOLD): the surface stays.
  const placed = (await device.boundingBox())!;
  const surface = (await page.locator('svg.filius-canvas').boundingBox())!;
  await page.mouse.move(surface.x + 20, surface.y + surface.height - 20);
  await page.mouse.down();
  await page.mouse.move(surface.x + 22, surface.y + surface.height - 20);
  await page.mouse.up();
  expect((await device.boundingBox())!.x).toBe(placed.x);
});

test('shows all of a large example at first', async ({ page }) => {
  await open(page, 'Internet_Komplett_mit_eMail_Webserver_Intranet_Portforwarding_Firewall_DHCP_DE.fls');
  await page.waitForTimeout(100);
  const zoom = Number(await page.locator('[data-zoom]').getAttribute('data-zoom'));
  expect(zoom).toBeLessThan(1);
  const surface = (await page.locator('svg.filius-canvas').boundingBox())!;
  for (const box of await page.locator('g.device').evaluateAll((elements) => elements.map((element) => element.getBoundingClientRect().toJSON() as DOMRect))) {
    expect(box.left).toBeGreaterThanOrEqual(surface.x);
    expect(box.right).toBeLessThanOrEqual(surface.x + surface.width);
    expect(box.top).toBeGreaterThanOrEqual(surface.y);
    expect(box.bottom).toBeLessThanOrEqual(surface.y + surface.height);
  }
});