// The documentation mode in Chromium (F4.8b), on FILIUS' example
// nat_with_mapped_port, which has documentation: Java's third mode button;
// the sidebar's rectangle dragged onto the surface (its middle under the
// pointer), moved, resized to Java's smallest size, coloured from Java's
// list; the sidebar's text tapped into the view, typed into, made large and
// italic; Java's paint in the documentation mode and in the design; Delete;
// a simulation started ends the mode; „Exportieren“ (F4.8c): the image
// saved under the project's name, cut and painted as Java's, and Java's
// message when saving fails; and a phone.

import { readFileSync } from 'node:fs';
import { expect, test, type Page } from '@playwright/test';
import { JAVA_LABEL_FONT } from '../src/canvas/layout.js';
import { documentUpdates, drag, drawing, openEditor, serveEditor } from './editorPage.js';

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

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

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

const newDoc = async (page: Page, before: ReadonlySet<string>) => {
  await expect.poll(async () => (await drawing(page)).docs.filter((item) => !before.has(item.id)).length).toBe(1);
  return (await drawing(page)).docs.find((item) => !before.has(item.id))!;
};
const docOf = async (page: Page, id: string) => (await drawing(page)).docs.find((item) => item.id === id);
const fill = (page: Page, id: string) => page.locator(`g[data-doc="${id}"] .doc-rectangle`).evaluate((rect) => getComputedStyle(rect).fill);

async function longPress(page: Page, at: { x: number; y: number }) {
  await page.mouse.move(at.x, at.y);
  await page.mouse.down();
  await page.waitForTimeout(700);
  await page.mouse.up();
}

test('makes, moves, resizes, colours and types documentation as Java does, and paints it per mode', async ({ page }) => {
  test.setTimeout(120_000);
  await openEditor(page, server.base, 'nat_with_mapped_port.fls');
  const canvas = page.locator('svg.filius-canvas');
  const existing = new Set((await drawing(page)).docs.map((item) => item.id));
  expect(existing.size).toBeGreaterThan(0);

  // Java's order: documentation, design, simulation.
  expect(await page.locator('.editor-toolbar button[name$="Mode"]').evaluateAll((buttons) => buttons.map((each) => each.getAttribute('name')))).toEqual([
    'documentationMode',
    'designMode',
    'simulationMode',
  ]);
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  await expect(canvas).toHaveAttribute('data-mode', 'documentation');
  await expect(page.getByRole('navigation', { name: 'Komponenten' })).toHaveCount(0);
  const sidebar = page.getByRole('navigation', { name: 'Dokumentation' });
  await expect(sidebar.getByRole('button', { name: 'Leiste einklappen' })).toBeVisible();
  await expect(sidebar.locator('.side-bar__items').getByRole('button')).toHaveText(['Text', 'Gliederungsfläche', 'Exportieren', 'Report']);

  // A rectangle dragged onto the surface: 100 × 50, its middle where it was dropped, grey, with the focus.
  const surface = (await canvas.boundingBox())!;
  const drop = { x: surface.x + surface.width * 0.6, y: surface.y + surface.height * 0.3 };
  const button = (await sidebar.getByRole('button', { name: 'Gliederungsfläche' }).boundingBox())!;
  await drag(page, { x: button.x + button.width / 2, y: button.y + button.height / 2 }, drop);
  const rectangle = await newDoc(page, existing);
  expect([rectangle.kind, rectangle.width, rectangle.height]).toEqual(['rectangle', 100, 50]);
  const focusBox = (await page.locator(`g[data-doc="${rectangle.id}"] .doc-focus`).boundingBox())!;
  expect(Math.abs(focusBox.x + focusBox.width / 2 - drop.x)).toBeLessThan(2);
  expect(Math.abs(focusBox.y + focusBox.height / 2 - drop.y)).toBeLessThan(2);
  // Java's paint in the documentation mode: grey at an opacity of 200.
  expect(await fill(page, rectangle.id)).toBe('rgba(204, 204, 204, 0.784)');

  // Moved by its middle, resized by its corner to Java's smallest (20 × 20); a drag is one change of the document, when it is let go.
  const changes = await documentUpdates(page);
  await drag(page, drop, { x: drop.x + 40, y: drop.y + 30 });
  await expect.poll(async () => (await docOf(page, rectangle.id))!.x - rectangle.x).toBeGreaterThan(20);
  expect(await documentUpdates(page)).toBe(changes + 1);
  const moved = (await docOf(page, rectangle.id))!;
  const corner = (await page.locator(`g[data-doc="${rectangle.id}"] .doc-focus`).boundingBox())!;
  await drag(page, { x: corner.x + corner.width - 2, y: corner.y + corner.height - 2 }, { x: corner.x - 50, y: corner.y - 50 });
  await expect
    .poll(async () => {
      const item = (await docOf(page, rectangle.id))!;
      return [item.x, item.y, item.width, item.height];
    })
    .toEqual([moved.x, moved.y, 20, 20]);

  // Its menu: only the colour (Java's twelve) and „Löschen“; a colour chosen.
  const small = (await page.locator(`g[data-doc="${rectangle.id}"] .doc-focus`).boundingBox())!;
  await longPress(page, { x: small.x + small.width / 2, y: small.y + small.height / 2 });
  const menu = page.getByRole('menu');
  await expect(menu.getByRole('group')).toHaveCount(1);
  await expect(menu.getByRole('group', { name: 'Farbe' }).getByRole('menuitemradio')).toHaveCount(12);
  await expect(menu.getByRole('menuitemradio', { name: 'Farbe 2' })).toHaveAttribute('aria-checked', 'true');
  await menu.getByRole('menuitemradio', { name: 'Farbe 5' }).click();
  await expect.poll(async () => (await docOf(page, rectangle.id))!.color).toEqual({ red: 1, green: 201 / 255, blue: 201 / 255, alpha: 1 });

  // A text tapped from the sidebar: in the middle of the view, typed into at once.
  const withRectangle = new Set((await drawing(page)).docs.map((item) => item.id));
  await sidebar.getByRole('button', { name: 'Text' }).click();
  const text = await newDoc(page, withRectangle);
  const field = page.getByRole('textbox', { name: 'Text' });
  await expect(field).toBeFocused();
  await page.keyboard.type('Netz A');
  await page.keyboard.press('Enter');
  await page.keyboard.type('zweite Zeile');
  await expect.poll(async () => (await docOf(page, text.id))!.text).toBe('Netz A\nzweite Zeile');
  // Its menu: size, style, Java's fifteen colours; „Groß“, then „Kursiv“.
  const textFocus = (await page.locator(`g[data-doc="${text.id}"] .doc-focus`).boundingBox())!;
  const band = { x: textFocus.x + textFocus.width / 2, y: textFocus.y + textFocus.height - 8 };
  await longPress(page, band);
  await expect(menu.getByRole('group')).toHaveText([/^Schriftgröße/, /^Schriftstil/, /^Farbe/]);
  await expect(menu.getByRole('group', { name: 'Farbe' }).getByRole('menuitemradio')).toHaveCount(15);
  await expect(menu.getByRole('group', { name: 'Schriftgröße' }).getByRole('menuitemradio', { checked: true })).toHaveAccessibleName('Normal');
  await menu.getByRole('menuitemradio', { name: 'Groß', exact: true }).click();
  await longPress(page, band);
  await menu.getByRole('group', { name: 'Schriftstil' }).getByRole('menuitemradio', { name: 'Kursiv' }).click();
  await expect
    .poll(async () => {
      const item = (await docOf(page, text.id))!;
      return [item.size, item.italic, item.bold];
    })
    .toEqual([18, true, false]);
  await expect(field).toHaveCSS('font-style', 'italic');

  // Escape ends the focus: the text drawn, with Java's grey border in the documentation mode.
  await field.press('Escape');
  await expect(field).toHaveCount(0);
  const words = page.locator(`g[data-doc="${text.id}"] .doc-text`);
  await expect(words).toHaveText('Netz A\nzweite Zeile');
  await expect(words).toHaveCSS('border-top-color', 'rgb(179, 179, 179)');
  await expect(words).toHaveCSS('font-size', '18px');
  await expect(words).toHaveCSS('font-style', 'italic');
  // A rectangle without the focus is moved at once (Java gives it the focus with the press).
  const before = (await docOf(page, rectangle.id))!;
  const unfocused = (await page.locator(`g[data-doc="${rectangle.id}"] .doc-rectangle`).boundingBox())!;
  await expect(page.locator(`g[data-doc="${rectangle.id}"]`)).not.toHaveAttribute('data-focused', 'true');
  await drag(page, { x: unfocused.x + unfocused.width / 2, y: unfocused.y + unfocused.height / 2 }, { x: unfocused.x + unfocused.width / 2 + 30, y: unfocused.y + unfocused.height / 2 });
  await expect.poll(async () => (await docOf(page, rectangle.id))!.x - before.x).toBeGreaterThan(10);

  // The design: the rectangle opaque, a fifth of the way to white, below the devices; the text without its border; documentation is not chosen.
  await page.getByRole('button', { name: 'Wechselt in den Entwurfsmodus' }).click();
  await expect(canvas).toHaveAttribute('data-mode', 'design');
  expect(await fill(page, rectangle.id)).toBe('rgb(255, 212, 212)');
  await expect(page.locator(`g[data-doc="${rectangle.id}"] .doc-rectangle`)).toHaveCSS('stroke', 'rgb(204, 160, 160)');
  await expect(words).toHaveCSS('border-top-style', 'none');
  const wordsBox = (await words.boundingBox())!;
  await page.mouse.click(wordsBox.x + 4, wordsBox.y + 4);
  await expect(page.locator('[data-focused="true"]')).toHaveCount(0);
  await expect(page.getByRole('navigation', { name: 'Komponenten' })).toBeVisible();

  // Back in the documentation mode: Delete removes the focused rectangle.
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  const rectangleBox = (await page.locator(`g[data-doc="${rectangle.id}"] .doc-rectangle`).boundingBox())!;
  await page.mouse.click(rectangleBox.x + rectangleBox.width / 2, rectangleBox.y + rectangleBox.height / 2);
  await expect(page.locator(`g[data-doc="${rectangle.id}"]`)).toHaveAttribute('data-focused', 'true');
  await page.keyboard.press('Delete');
  await expect.poll(async () => (await docOf(page, rectangle.id)) === undefined).toBe(true);

  // A simulation started ends the documentation mode, as Java's does.
  await page.getByRole('button', { name: 'Wechselt in den Aktionsmodus' }).click();
  await expect(canvas).toHaveAttribute('data-mode', 'simulation');
  await expect(sidebar).toHaveCount(0);
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  await expect(canvas).toHaveAttribute('data-mode', 'documentation');
  await expect(page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' })).toHaveAttribute('aria-pressed', 'true');
});

test("exports the surface as Java's image, under the project's name", async ({ page }) => {
  await openEditor(page, server.base, 'nat_with_mapped_port.fls');
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  const button = page.getByRole('navigation', { name: 'Dokumentation' }).getByRole('button', { name: 'Exportieren' });
  await expect(button).toHaveAttribute('title', 'Als Bild exportieren');
  const saved = page.waitForEvent('download');
  await button.click();
  const download = await saved;
  expect(download.suggestedFilename()).toBe('nat_with_mapped_port.png');
  // Ready for the next one.
  await expect(button).toBeEnabled();
  const base64 = readFileSync((await download.path())!).toString('base64');

  // What it should show, from the surface: every device's button and every documentation element, 10 around, the footer 20 below.
  const boxes = await page.locator('g.device').evaluateAll((devices) => devices.map((device) => device.getAttribute('data-box')!.split(' ').map(Number)));
  const docs = (await drawing(page)).docs;
  const parts = [...boxes.map(([x, y, width, height]) => ({ x: x!, y: y!, width: width!, height: height! })), ...docs];
  const left = Math.min(...parts.map((part) => part.x));
  const top = Math.min(...parts.map((part) => part.y));
  const right = Math.max(...parts.map((part) => part.x + part.width));
  const bottom = Math.max(...parts.map((part) => part.y + part.height));
  const footerWidth = await page.evaluate(
    ({ font, text }) => {
      const context = document.createElement('canvas').getContext('2d')!;
      context.font = font;
      return Math.round(context.measureText(text).width) + 20;
    },
    { font: JAVA_LABEL_FONT, text: 'nat_with_mapped_port.fls' },
  );
  const rectangle = docs.find((item) => item.kind === 'rectangle')!;
  const image = await page.evaluate(
    async ({ base64, rectangle, footer }) => {
      const bytes = Uint8Array.from(atob(base64), (character) => character.charCodeAt(0));
      const bitmap = await createImageBitmap(new Blob([bytes], { type: 'image/png' }));
      const canvas = new OffscreenCanvas(bitmap.width, bitmap.height);
      const context = canvas.getContext('2d')!;
      context.drawImage(bitmap, 0, 0);
      const pixel = (x: number, y: number) => [...context.getImageData(x, y, 1, 1).data];
      const footerPixels = context.getImageData(footer.x, footer.y, footer.width, footer.height).data;
      let grey = 0;
      for (let index = 0; index < footerPixels.length; index += 4) {
        if (footerPixels[index] === 192 && footerPixels[index + 1] === 192 && footerPixels[index + 2] === 192 && footerPixels[index + 3] === 255) grey += 1;
      }
      return { width: bitmap.width, height: bitmap.height, corner: pixel(0, 0), rectangle: pixel(rectangle.x, rectangle.y), grey };
    },
    {
      base64,
      rectangle: { x: rectangle.x + 8 - (left - 10), y: rectangle.y + 8 - (top - 10) },
      footer: { x: 10, y: bottom + 20 - (top - 10), width: footerWidth, height: 17 },
    },
  );
  expect([image.width, image.height]).toEqual([Math.max(right, left + 10 + footerWidth) + 10 - (left - 10), bottom + 20 + 17 + 20 - (top - 10)]);
  // Transparent around; a grey rectangle (204) as the design paints it, a fifth of the way to white; the footer light grey.
  expect(image.corner).toEqual([0, 0, 0, 0]);
  expect(image.rectangle).toEqual([215, 215, 215, 255]);
  expect(image.grey).toBeGreaterThan(20);
});

test("shows Java's message when the image cannot be saved", async ({ page }) => {
  await openEditor(page, server.base, 'nat_with_mapped_port.fls');
  await page.evaluate(() => {
    HTMLCanvasElement.prototype.toBlob = function (callback: BlobCallback) {
      callback(null);
    };
  });
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  const button = page.getByRole('button', { name: 'Exportieren' });
  await button.click();
  await expect(page.getByRole('alert')).toHaveText('Fehler beim Speichern aufgetreten!');
  await expect(button).toBeEnabled();
});

test('keeps the documentation mode within reach on a phone', async ({ page }) => {
  await page.setViewportSize({ width: 360, height: 740 });
  await openEditor(page, server.base, 'nat_with_mapped_port.fls');
  await page.getByRole('button', { name: 'Wechselt in den Dokumentationsmodus' }).click();
  await expect(page.getByRole('button', { name: 'Gliederungsfläche' })).toBeInViewport({ ratio: 1 });
  await expect(page.getByRole('button', { name: 'Exportieren' })).toBeInViewport({ ratio: 1 });
  await expect(page.getByRole('button', { name: 'Report' })).toBeInViewport({ ratio: 1 });
  const rights = await page.locator('.editor-toolbar > *').evaluateAll((parts) => parts.map((part) => part.getBoundingClientRect().right));
  expect(Math.max(...rights)).toBeLessThanOrEqual(360);
});