import { getMainWindow } from "ee-core/electron";
import { app, dialog, shell } from "electron";
import { logger } from "ee-core/log";
import path from "path";
import fs from "fs";
import http from "http";
import https from "https";
import FormData from "form-data";
class Os {

  async minimizeWindow() {
    getMainWindow().minimize();
  }
  async maximizeWindow() {
    getMainWindow().maximize();
  }
  async unmaximizeWindow() {
    getMainWindow().unmaximize();
  }
  async closeWindow() {
    getMainWindow().close();
  }
  async isMaximized() {
    return getMainWindow().isMaximized();
  }
  async toggleDevTools() {
    getMainWindow().webContents.toggleDevTools();
  }
  async openUserDataFolder() {
    const userDataPath = app.getPath('userData');
    await shell.openPath(userDataPath);
  }
  async openInstallFolder() {
    const exePath = app.getPath('exe');
    const installDir = path.dirname(exePath);
    await shell.openPath(installDir);
  }

  async selectDirectory() {
    const win = getMainWindow();
    const result = await dialog.showOpenDialog(win, {
      title: '选择目录',
      properties: ['openDirectory', 'createDirectory'],
    });
    if (result.canceled || !result.filePaths || result.filePaths.length === 0) {
      return '';
    }
    return result.filePaths[0];
  }

  /**
   * 按偏移分块读本机文件，返回 base64（离线地图瓦片这类大文件只按需取块）。
   *
   * <p>渲染进程侧的实现见 core/utils/map/offlineMap.ts 的 ElectronPmtilesSource：
   * PMTiles 只要求 getBytes(offset, length)，所以这里只做「绝对路径 + 真实文件 + 边界收敛」。
   *
   * @param params { filePath: string, offset?: number, length: number }
   * @returns { data: base64, size: 实际读到的字节数, fileSize: 文件总大小 }
   */
  async readBinaryFileRange(params = {}) {
    const filePath = typeof params?.filePath === 'string' ? params.filePath.trim() : '';
    if (!filePath) throw new Error('文件路径不能为空');
    if (!path.isAbsolute(filePath)) throw new Error('只支持绝对路径');
    if (!fs.existsSync(filePath)) throw new Error(`文件不存在：${filePath}`);
    if (!fs.statSync(filePath).isFile()) throw new Error('目标是目录，不是文件');

    const fileSize = fs.statSync(filePath).size;
    const offset = Math.max(0, Math.floor(Number(params?.offset) || 0));
    const requested = Math.floor(Number(params?.length) || 0);
    if (!requested || requested < 0) throw new Error('读取长度不合法');
    if (offset >= fileSize) return { data: '', size: 0, fileSize };

    const length = Math.min(requested, fileSize - offset);
    const fd = fs.openSync(filePath, 'r');
    try {
      const buffer = Buffer.alloc(length);
      const read = fs.readSync(fd, buffer, 0, length, offset);
      return { data: buffer.subarray(0, read).toString('base64'), size: read, fileSize };
    } finally {
      fs.closeSync(fd);
    }
  }

  /**
   * 读本机文本文件（离线地图样式 JSON 等）。
   * @param params { filePath: string, encoding?: string }
   */
  async readTextFile(params = {}) {
    const filePath = typeof params?.filePath === 'string' ? params.filePath.trim() : '';
    if (!filePath) throw new Error('文件路径不能为空');
    if (!path.isAbsolute(filePath)) throw new Error('只支持绝对路径');
    if (!fs.existsSync(filePath)) throw new Error(`文件不存在：${filePath}`);
    if (!fs.statSync(filePath).isFile()) throw new Error('目标是目录，不是文件');
    const encoding = typeof params?.encoding === 'string' && params.encoding ? params.encoding : 'utf8';
    return fs.readFileSync(filePath, encoding);
  }

  async getAppInfo() {
    return {
      version: app.getVersion(),
      name: app.getName(),
      electronVersion: process.versions.electron,
      chromeVersion: process.versions.chrome,
      nodeVersion: process.versions.node,
      platform: process.platform,
      arch: process.arch,
      userDataPath: app.getPath('userData'),
      exePath: app.getPath('exe'),
    };
  }

  async openExternal(url) {
    if (!url || typeof url !== 'string') return false;
    try {
      await shell.openExternal(url);
      return true;
    } catch (e) {
      logger.error('[os] openExternal failed:', e);
      return false;
    }
  }

  /**
   * 通过 Node.js 主进程流式上传清鉴数据源文件
   * - 校验选中目录最后一级必须为 QingJian
   * - 在 QingJian 目录下拼接 workspace 作为扫描根
   * - 扫描 workspace 下一层文件夹，再读取每个文件夹下的文件（不递归更深层）
   * - 用 fs.createReadStream 流式读取，避免大文件占内存
   * - 用 form-data 构建 multipart，http/https 模块发送
   * @param params.dirPath 目录完整磁盘路径（最后一级必须为 QingJian）
   * @param params.uploadUrl 后端接口完整 URL
   * @param params.token 鉴权 token（可选）
   */
  async uploadQingJianFiles(params) {
    logger.info('[os] uploadQingJianFiles params:', params);
    const { dirPath, uploadUrl, token } = params || {};
    if (!dirPath || !uploadUrl) {
      logger.error('[os] uploadQingJianFiles params missing:', params);
      throw new Error('请选择 QingJian 目录');
    }

    // 1. 校验选中目录最后一级必须为 QingJian
    const dirName = path.basename(dirPath);
    if (dirName !== 'QingJian') {
      throw new Error('请选择 QingJian 目录');
    }

    // 2. 在选中目录下拼接 workspace，作为扫描根目录
    const workspacePath = path.join(dirPath, 'workspace');
    const platPath = path.join(dirPath, 'db',"plat");

    // 3. 扫描 workspace 下一层文件夹，再读取每个文件夹下的文件（不递归更深层）
    //    id = 文件直接所在的父级目录名（即子文件夹名）
    const subEntries = await fs.promises.readdir(workspacePath, { withFileTypes: true });
    const subDirs = subEntries.filter(e => e.isDirectory());
    if (subDirs.length === 0) {
      throw new Error('workspace 目录下没有子文件夹');
    }
    const files = [];
    for (const sub of subDirs) {
      const subDirPath = path.join(workspacePath, sub.name);
      const subFiles = await fs.promises.readdir(subDirPath, { withFileTypes: true });
      for (const f of subFiles) {
        if (f.isFile()) {
          files.push({ id: sub.name, name: f.name, filePath: path.join(subDirPath, f.name) });
        }
      }
    }
    files.push({ id: 'plat', name: 'plat', filePath: platPath });
    if (files.length === 0) {
      throw new Error('workspace 的子文件夹下没有可上传的文件');
    }

    // 4. 构建 multipart FormData
    const form = new FormData();
    form.append('path', dirPath);

    for (let i = 0; i < files.length; i++) {
      const { id, name: fileName, filePath } = files[i];
      const stream = fs.createReadStream(filePath);
      form.append(`items[${i}].file`, stream, { filename: fileName });
      form.append(`items[${i}].name`, fileName);
      form.append(`items[${i}].id`, id);
    }

    // 3. 发送 HTTP 请求（流式 pipe，不占内存）
    return await new Promise((resolve, reject) => {
      const urlObj = new URL(uploadUrl);
      const lib = urlObj.protocol === 'https:' ? https : http;

      const headers = form.getHeaders();
      if (token) {
        headers['Authorization'] = token;
      }

      const req = lib.request(uploadUrl, {
        method: 'POST',
        headers,
      }, (res) => {
        let data = '';
        res.setEncoding('utf8');
        res.on('data', (chunk) => { data += chunk; });
        res.on('end', () => {
          const status = res.statusCode || 0;
          if (status >= 200 && status < 300) {
            try {
              resolve(JSON.parse(data));
            } catch {
              resolve(data);
            }
          } else {
            reject(new Error(`HTTP ${status}: ${data}`));
          }
        });
      });

      req.on('error', (e) => {
        logger.error('[os] uploadQingJianFiles request error:', e);
        reject(e.message);
      });

      form.pipe(req);
    });
  }

}
Os.toString = () => 'Os';
export const os = new Os();