// What the editor's browser tests share: the built page served once per file,
// and reading the surface (its transform, a device's place on the screen, the
// document's drawing through the development page's filiusDev).

import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import type { Page } from '@playwright/test';
import { build, preview, type PreviewServer } from 'vite';
import type { DeviceSheet, TopologyView } from '@mdg-filius/doc';

const config = join(dirname(fileURLToPath(import.meta.url)), '../vite.config.ts');

export async function serveEditor(): Promise<{ readonly base: string; readonly close: () => Promise<void> }> {
  await build({ configFile: config, logLevel: 'silent' });
  const server: PreviewServer = await preview({ configFile: config, preview: { port: 0 }, logLevel: 'silent' });
  return {
    base: server.resolvedUrls!.local[0]!,
    close: () => new Promise<void>((resolve) => server.httpServer.close(() => resolve())),
  };
}

export async function openEditor(page: Page, base: string, example: string, query = ''): Promise<void> {
  await page.goto(`${base}?example=${example}${query}`);
  await page.waitForSelector('svg.filius-canvas');
  await page.waitForFunction(() => (window as unknown as { filiusDev?: unknown }).filiusDev !== undefined);
}

/** The document's drawing. */
export function drawing(page: Page): Promise<TopologyView> {
  return page.evaluate(() => (window as unknown as { filiusDev: { view: () => TopologyView } }).filiusDev.view());
}

/** What the device sheet reads of a device. */
export function sheetOf(page: Page, id: string): Promise<DeviceSheet | undefined> {
  return page.evaluate((each) => (window as unknown as { filiusDev: { sheet: (id: string) => DeviceSheet | undefined } }).filiusDev.sheet(each), id);
}

/** A device's button as data-box says it (surface pixels). */
export async function boxOf(page: Page, id: string): Promise<{ x: number; y: number; width: number; height: number }> {
  const [x, y, width, height] = (await page.locator(`g.device[data-node="${id}"]`).getAttribute('data-box'))!.split(' ').map(Number) as [number, number, number, number];
  return { x, y, width, height };
}

/** Where a device's icon's middle is on the screen. */
export async function iconCentre(page: Page, id: string): Promise<{ x: number; y: number }> {
  const box = (await page.locator(`g.device[data-node="${id}"] image`).boundingBox())!;
  return { x: box.x + box.width / 2, y: box.y + box.height / 2 };
}

/** A point of a device's button on the screen, by its share of the button's width and height. */
export async function onDevice(page: Page, id: string, across = 0.5, down = 0.4): Promise<{ x: number; y: number }> {
  const box = (await page.locator(`g.device[data-node="${id}"] > rect`).first().boundingBox())!;
  return { x: box.x + box.width * across, y: box.y + box.height * down };
}

/** The surface's scale. */
export async function scaleOf(page: Page): Promise<number> {
  return Number(await page.locator('[data-zoom]').getAttribute('data-zoom'));
}

/** Drags with the mouse from one point to another in steps. */
export async function drag(page: Page, from: { x: number; y: number }, to: { x: number; y: number }): Promise<void> {
  await page.mouse.move(from.x, from.y);
  await page.mouse.down();
  await page.mouse.move(to.x, to.y, { steps: 8 });
  await page.mouse.up();
}