import path from 'path';
import { BrowserWindow, screen } from 'electron';
import { getBaseDir, isDev } from 'ee-core/ps';
import { logger } from 'ee-core/log';
import { getMainWindow } from 'ee-core/electron';
import { getSmartWindowOptions, smartWindowSize } from '../../config/windowOptions';
import { localSettingsService } from '../setting/localSettings';

/** 窗口 bounds 在本机设置里的键名 */
const BOUNDS_KEY = 'smartWindowBounds';
/** 智能窗口只承载工作台，非该路径一律改写 */
const WORKBENCH_PATH = '/workbench';
/** 主进程 → 主窗口的窗口开关状态通道 */
export const SMART_WINDOW_STATE_CHANNEL = 'smart-window:state';

export interface OpenSmartWindowOptions {
  /** 完整路由（含 query），如 /workbench?newChat=1 */
  fullPath?: string;
  /** 窗口已存在时是否整窗重载（换案后需要重新读案件上下文） */
  reloadIfOpen?: boolean;
  /** 窗口已存在且目标带 query 时，是否导航到该地址（?newChat=1 / ?view=agent 这类明确意图） */
  navigateIfOpen?: boolean;
}

interface SavedBounds {
  x: number;
  y: number;
  width: number;
  height: number;
}

/** 单例：应用内最多一个智能工作台窗口 */
let smartWindow: BrowserWindow | null = null;

export function getSmartWindow(): BrowserWindow | null {
  return smartWindow && !smartWindow.isDestroyed() ? smartWindow : null;
}

export function isSmartWindowOpen(): boolean {
  return !!getSmartWindow();
}

/** 判断某个窗口是不是智能工作台窗口（IPC 解析窗口角色用） */
export function isSmartWindow(win: BrowserWindow | null | undefined): boolean {
  const current = getSmartWindow();
  return !!win && !!current && win.id === current.id;
}

/**
 * 打开/聚焦智能工作台窗口。
 *
 * 已存在时只做 restore/show/focus（reloadIfOpen 时再 reload），保证单例。
 */
export function openSmartWindow(options: OpenSmartWindowOptions = {}): BrowserWindow {
  const fullPath = normalizeFullPath(options.fullPath);
  const existing = getSmartWindow();

  if (existing) {
    focusWindow(existing);

    if (options.reloadIfOpen) {
      // 刚由本次导航创建、还在加载时不用再刷一次；已加载完成的才需要按新案件重建
      if (!existing.webContents.isLoading()) {
        existing.webContents.reload();
      }
    } else if (options.navigateIfOpen && fullPath.includes('?')) {
      // 显式带 query（?newChat=1 / ?view=agent）说明是明确的导航意图；
      // 普通打开/聚焦不动它当前所在的视图
      loadRenderer(existing, fullPath);
    }
    return existing;
  }

  const win = new BrowserWindow({
    ...getSmartWindowOptions(),
    ...restoreBounds(),
  });
  smartWindow = win;

  win.once('ready-to-show', () => {
    if (!win.isDestroyed()) {
      win.show();
      win.focus();
    }
  });

  win.on('close', () => saveBounds(win));
  win.on('closed', () => {
    if (smartWindow === win) smartWindow = null;
    notifyState(false);
  });

  // 渲染进程崩溃后留一个空壳没有意义：销毁它，下次点「智能」重新创建
  win.webContents.on('render-process-gone', (_event, details) => {
    logger.error('[smartWindow] render-process-gone:', details?.reason);
    if (!win.isDestroyed()) {
      saveBounds(win);
      win.destroy();
    }
  });

  loadRenderer(win, fullPath);
  notifyState(true);
  return win;
}

export function closeSmartWindow(): void {
  const win = getSmartWindow();
  if (!win) return;
  win.close();
}

/** 把已打开的智能窗口拉到前台；没打开返回 false */
export function focusSmartWindow(): boolean {
  const win = getSmartWindow();
  if (!win) return false;
  focusWindow(win);
  return true;
}

/** 把主窗口拉到前台（智能窗口遇到登录/授权失效时，由主窗口负责提示） */
export function focusMainWindow(): void {
  try {
    focusWindow(getMainWindow());
  } catch (e) {
    logger.warn('[smartWindow] focusMainWindow failed:', e instanceof Error ? e.message : String(e));
  }
}

function focusWindow(win: BrowserWindow): void {
  if (win.isMinimized()) win.restore();
  win.show();
  win.focus();
}

function normalizeFullPath(fullPath?: string): string {
  const raw = typeof fullPath === 'string' ? fullPath.trim() : '';
  if (!raw) return WORKBENCH_PATH;
  // 只接受工作台地址，避免把业务页塞进智能窗口（如 /workbenchfoo 不算）
  return /^\/workbench(\/|\?|$)/.test(raw) ? raw : WORKBENCH_PATH;
}

function loadRenderer(win: BrowserWindow, fullPath: string): void {
  const devServerUrl = resolveDevServerUrl();
  if (devServerUrl) {
    win.loadURL(`${devServerUrl}${fullPath}`).catch((err) => {
      logger.error('[smartWindow] loadURL failed:', err);
    });
    return;
  }

  // 生产是 file:// + hash 路由：hash 带上完整路径与 query
  const indexPath = path.join(getBaseDir(), 'public', 'dist', 'index.html');
  win.loadFile(indexPath, { hash: fullPath }).catch((err) => {
    logger.error('[smartWindow] loadFile failed:', err);
  });
}

/**
 * 开发环境的前端地址：与 ee-core 加载主窗口同口径，端口来自 cmd/bin.js 的 dev.frontend.port。
 * 生产环境（或读不到配置）返回 null，走 loadFile。
 */
function resolveDevServerUrl(): string | null {
  if (!isDev()) return null;

  try {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const binConfig = require(path.join(getBaseDir(), 'cmd', 'bin.js'));
    const frontend = binConfig?.dev?.frontend || {};
    const protocol = typeof frontend.protocol === 'string' ? frontend.protocol : 'http://';
    if (protocol === 'file://') return null;
    const hostname = typeof frontend.hostname === 'string' ? frontend.hostname : 'localhost';
    const port = Number(frontend.port) || 3100;
    return `${protocol}${hostname}:${port}`;
  } catch (e) {
    logger.warn('[smartWindow] 读取 cmd/bin.js 失败，回退 http://localhost:3100');
    return 'http://localhost:3100';
  }
}

function saveBounds(win: BrowserWindow): void {
  try {
    const { x, y, width, height } = win.getBounds();
    localSettingsService.set(BOUNDS_KEY, JSON.stringify({ x, y, width, height }));
  } catch (e) {
    logger.warn('[smartWindow] 保存窗口位置失败:', e instanceof Error ? e.message : String(e));
  }
}

/** 恢复上次的位置与大小；越界或尺寸不合法时交给 Electron 默认放置 */
function restoreBounds(): Partial<SavedBounds> {
  try {
    const raw = localSettingsService.get(BOUNDS_KEY);
    if (!raw) return {};

    const parsed = JSON.parse(raw) as Partial<SavedBounds>;
    const { x, y, width, height } = parsed || {};
    if (![x, y, width, height].every((value) => typeof value === 'number' && Number.isFinite(value))) {
      return {};
    }
    if ((width as number) < smartWindowSize.minWidth || (height as number) < smartWindowSize.minHeight) {
      return {};
    }

    // 显示器拔掉/分辨率变化后，旧坐标可能落在屏幕外
    const visible = screen.getAllDisplays().some((display) => {
      const area = display.workArea;
      return (
        (x as number) < area.x + area.width &&
        (x as number) + (width as number) > area.x &&
        (y as number) < area.y + area.height &&
        (y as number) + (height as number) > area.y
      );
    });

    return visible ? { x, y, width, height } : {};
  } catch (e) {
    logger.warn('[smartWindow] 恢复窗口位置失败:', e instanceof Error ? e.message : String(e));
    return {};
  }
}

function notifyState(open: boolean): void {
  try {
    const main = getMainWindow();
    if (!main.isDestroyed() && !main.webContents.isDestroyed()) {
      main.webContents.send(SMART_WINDOW_STATE_CHANNEL, { open });
    }
  } catch {
    // 主窗口尚未创建或应用正在退出：忽略
  }
}