import path from 'node:path';

import { app, BrowserWindow } from 'electron';

import { getAppSemanticVersion } from '../versionInfo';

let bootSplashRef: BrowserWindow | null = null;

export function getBootSplashWindow(): BrowserWindow | null {
  return bootSplashRef;
}

function loadBootPage(win: BrowserWindow): void {
  const dev = process.env.VITE_DEV_SERVER_URL;
  if (dev) {
    void win.loadURL(new URL('boot.html', dev).toString());
    return;
  }
  const htmlPath = path.join(app.getAppPath(), 'dist', 'renderer', 'boot.html');
  void win.loadFile(htmlPath);
}

/** Без preload: только статический экран; статус задаётся из main через executeJavaScript. */
function bootWebPreferences(): Electron.WebPreferences {
  const dev = Boolean(process.env.VITE_DEV_SERVER_URL);
  return {
    contextIsolation: true,
    sandbox: dev ? true : process.platform !== 'win32',
    nodeIntegration: false,
    devTools: dev || process.env.DND_OPEN_DEVTOOLS === '1',
    webSecurity: dev,
  };
}

/**
 * Окно без системного заголовка: логотип, название, строка статуса.
 * Показывать после `waitForBootWindowReady`.
 */
export function createBootWindow(): BrowserWindow {
  const win = new BrowserWindow({
    width: 440,
    height: 420,
    show: false,
    frame: false,
    resizable: false,
    maximizable: false,
    minimizable: false,
    closable: false,
    center: true,
    transparent: false,
    backgroundColor: '#09090B',
    roundedCorners: true,
    webPreferences: bootWebPreferences(),
  });

  bootSplashRef = win;
  win.once('closed', () => {
    if (bootSplashRef === win) {
      bootSplashRef = null;
    }
  });

  loadBootPage(win);
  return win;
}

/**
 * Закрыть splash: при `closable: false` на Windows `close()` из main часто не срабатывает — используем `destroy()`.
 */
export function destroyBootWindow(win: BrowserWindow): void {
  if (win.isDestroyed()) return;
  win.destroy();
}

export function setBootWindowStatus(win: BrowserWindow, text: string): void {
  if (win.isDestroyed()) return;
  const escaped = JSON.stringify(text);
  void win.webContents.executeJavaScript(
    `(() => { const el = document.getElementById('boot-status'); if (el) el.textContent = ${escaped}; })()`,
  );
}

export function applyBootWindowBranding(win: BrowserWindow): void {
  if (win.isDestroyed()) return;
  const name = app.getName();
  const version = getAppSemanticVersion();
  const versionLabel = version.trim().length > 0 ? `v${version.trim()}` : '';
  void win.webContents.executeJavaScript(
    `(() => {
      const t = document.querySelector('[data-boot-title]');
      if (t) t.textContent = ${JSON.stringify(name)};
      const v = document.querySelector('[data-boot-version]');
      if (v) v.textContent = ${JSON.stringify(versionLabel)};
    })()`,
  );
}

/** Дождаться загрузки разметки экрана загрузки. */
export function waitForBootWindowReady(win: BrowserWindow): Promise<void> {
  return new Promise((resolve, reject) => {
    if (win.isDestroyed()) {
      reject(new Error('boot window destroyed'));
      return;
    }
    const onFail = (): void => {
      reject(new Error('boot window failed to load'));
    };
    win.webContents.once('did-fail-load', onFail);
    win.webContents.once('did-finish-load', () => {
      win.webContents.removeListener('did-fail-load', onFail);
      applyBootWindowBranding(win);
      resolve();
    });
  });
}