import { spawn } from 'cross-spawn';
import { Response } from 'express';
import fs from 'fs';
import { Agent, request } from 'undici';
import sum from 'lodash/sum';
import path from 'path';
import { Inject, Service } from 'typedi';
import winston from 'winston';
import config from '../config';
import { NotificationModeStringMap, TASK_COMMAND } from '../config/const';
import {
  getPid,
  killTask,
  parseContentVersion,
  parseVersion,
  promiseExec,
  readDirs,
  rmPath,
  setSystemTimezone,
} from '../config/util';
import {
  DependenceModel,
  DependenceStatus,
  DependenceTypes,
} from '../data/dependence';
import { NotificationInfo } from '../data/notify';
import {
  AuthDataType,
  SystemInfo,
  SystemInstance,
  SystemModel,
  SystemModelInfo,
} from '../data/system';
import taskLimit from '../shared/pLimit';
import NotificationService from './notify';
import ScheduleService, { TaskCallbacks } from './schedule';
import SockService from './sock';
import os from 'os';
import dayjs from 'dayjs';

@Service()
export default class SystemService {
  @Inject((type) => NotificationService)
  private notificationService!: NotificationService;

  constructor(
    @Inject('logger') private logger: winston.Logger,
    private scheduleService: ScheduleService,
    private sockService: SockService,
  ) { }

  public async getSystemConfig() {
    const doc = await this.getDb({ type: AuthDataType.systemConfig });
    return {
      ...doc,
      info: { ...doc.info, timezone: doc.info?.timezone || 'Asia/Shanghai' },
    };
  }

  private async updateAuthDb(payload: SystemInfo): Promise<SystemInfo> {
    const { id, ...others } = payload;
    await SystemModel.update(others, { where: { id } });
    const doc = await this.getDb({ id });
    return doc;
  }

  public async getDb(query: any): Promise<SystemInfo> {
    const doc = await SystemModel.findOne({ where: query });
    if (!doc) {
      throw new Error(`System ${JSON.stringify(query)} not found`);
    }
    return doc.get({ plain: true });
  }

  public async updateNotificationMode(notificationInfo: NotificationInfo) {
    const code = Math.random().toString().slice(-6);
    const isSuccess = await this.notificationService.testNotify(
      notificationInfo,
      '青龙',
      `【蛟龙】测试通知 https://t.me/jiao_long`,
    );
    if (isSuccess) {
      const result = await this.updateAuthDb({
        type: AuthDataType.notification,
        info: { ...notificationInfo },
      });
      return { code: 200, data: { ...result, code } };
    } else {
      return { code: 400, message: '通知发送失败，请检查参数' };
    }
  }

  public async updateLogRemoveFrequency(info: SystemModelInfo) {
    const oDoc = await this.getSystemConfig();
    const result = await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    const cron = {
      id: result.id as number,
      name: '删除日志',
      command: `ql rmlog ${info.logRemoveFrequency}`,
      runOrigin: 'system' as const,
    };
    if (oDoc.info?.logRemoveFrequency) {
      await this.scheduleService.cancelIntervalTask(cron);
    }
    if (info.logRemoveFrequency && info.logRemoveFrequency > 0) {
      this.scheduleService.createIntervalTask(
        cron,
        {
          days: info.logRemoveFrequency,
        },
        true,
      );
    }
    return { code: 200, data: info };
  }

  public async updateCronConcurrency(info: SystemModelInfo) {
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    if (info.cronConcurrency) {
      await taskLimit.setCustomLimit(info.cronConcurrency);
    }
    return { code: 200, data: info };
  }

  public async updateDependenceProxy(info: SystemModelInfo) {
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    if (info.dependenceProxy) {
      await fs.promises.writeFile(
        config.dependenceProxyFile,
        `export http_proxy="${info.dependenceProxy}"\nexport https_proxy="${info.dependenceProxy}"`,
      );
    } else {
      await fs.promises.rm(config.dependenceProxyFile);
    }
    return { code: 200, data: info };
  }

  public async updateNodeMirror(info: SystemModelInfo, res?: Response) {
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    let cmd = 'pnpm config delete registry';
    if (info.nodeMirror) {
      cmd = `pnpm config set registry ${info.nodeMirror}`;
    }
    let command = `cd && ${cmd}`;
    const docs = await DependenceModel.findAll({
      where: {
        type: DependenceTypes.nodejs,
        status: DependenceStatus.installed,
      },
    });
    if (docs.length > 0) {
      command += ` && pnpm i -g`;
    }
    this.scheduleService.runTask(
      command,
      {
        onStart: async (cp) => {
          res?.setHeader('QL-Task-Pid', `${cp.pid}`);
          res?.end();
        },
        onEnd: async () => {
          this.sockService.sendMessage({
            type: 'updateNodeMirror',
            message: 'update node mirror end',
          });
        },
        onError: async (message: string) => {
          this.sockService.sendMessage({ type: 'updateNodeMirror', message });
        },
        onLog: async (message: string) => {
          this.sockService.sendMessage({ type: 'updateNodeMirror', message });
        },
      },
      {
        command,
        id: 'update-node-mirror',
        runOrigin: 'system',
      },
    );
  }

  public async updatePythonMirror(info: SystemModelInfo) {
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    let cmd = 'pip config unset global.index-url';
    if (info.pythonMirror) {
      cmd = `pip3 config set global.index-url ${info.pythonMirror}`;
    }
    await promiseExec(cmd);
    return { code: 200, data: info };
  }

  public async updateLinuxMirror(
    info: SystemModelInfo,
    res?: Response,
    onEnd?: () => void,
  ) {
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    
    if (os.platform() !== 'linux') {
      return;
    }

    let command = '';
    
    // Check if this is a Debian-based system (including Armbian)
    // Check for both sources.list and debian_version for more reliable detection
    const hasAptSourcesList = await fs.promises.access('/etc/apt/sources.list')
      .then(() => true)
      .catch(() => false);
    const hasDebianVersion = await fs.promises.access('/etc/debian_version')
      .then(() => true)
      .catch(() => false);
    const isDebianBased = hasAptSourcesList || hasDebianVersion;
    
    if (isDebianBased) {
      // Handle Debian/Ubuntu/Armbian systems
      let defaultDomain = '';
      let targetDomain = info.linuxMirror || '';
      
      try {
        // Read the current sources.list
        const content = await fs.promises.readFile('/etc/apt/sources.list', {
          encoding: 'utf-8',
        });
        
        // Match the first deb line to extract the current mirror
        // Note: This assumes all mirrors in sources.list use the same base URL
        // If multiple different mirrors are configured, only the first one will be replaced
        const debMatch = content.match(/^deb\s+(https?:\/\/[^\s]+)/m);
        if (debMatch) {
          defaultDomain = debMatch[1];
        }
        
        if (defaultDomain && targetDomain) {
          // Sanitize and escape special characters for sed
          // Escape backslashes first, then other special characters
          const escapedDefault = defaultDomain
            .replace(/\\/g, '\\\\')  // Escape backslashes first
            .replace(/\//g, '\\/')   // Escape forward slashes
            .replace(/\./g, '\\.');  // Escape dots
          const escapedTarget = targetDomain
            .replace(/\\/g, '\\\\')  // Escape backslashes first
            .replace(/\//g, '\\/');  // Escape forward slashes
          
          // Replace mirror URL in main sources.list
          command = `sed -i 's/${escapedDefault}/${escapedTarget}/g' /etc/apt/sources.list`;
          
          // Also update sources.list.d if it exists
          command += ` && if [ -d /etc/apt/sources.list.d ]; then find /etc/apt/sources.list.d -type f \\( -name "*.list" -o -name "*.sources" \\) -exec sed -i 's/${escapedDefault}/${escapedTarget}/g' {} \\;; fi`;
          
          // Update package lists
          command += ` && apt-get update`;
        } else if (!defaultDomain && targetDomain) {
          // Cannot detect current mirror, log warning
          this.logger.warn('Unable to detect current mirror from /etc/apt/sources.list. Mirror update skipped.');
          this.sockService.sendMessage({
            type: 'updateLinuxMirror',
            message: 'Warning: Unable to detect current mirror. Please manually configure /etc/apt/sources.list',
          });
        }
      } catch (error) {
        this.logger.error('Failed to read /etc/apt/sources.list', error);
      }
    } else {
      // Handle Alpine Linux systems
      let defaultDomain = 'https://dl-cdn.alpinelinux.org';
      let targetDomain = 'https://dl-cdn.alpinelinux.org';
      
      try {
        const content = await fs.promises.readFile('/etc/apk/repositories', {
          encoding: 'utf-8',
        });
        const domainMatch = content.match(/(http.*)\/alpine\/.*/);
        if (domainMatch) {
          defaultDomain = domainMatch[1];
        }
        if (info.linuxMirror) {
          targetDomain = info.linuxMirror;
        }
        // Sanitize and escape special characters for sed
        // Escape backslashes first, then other special characters
        command = `sed -i 's/${defaultDomain
          .replace(/\\/g, '\\\\')  // Escape backslashes first
          .replace(/\//g, '\\/')   // Escape forward slashes
          .replace(/\./g, '\\.')}/${targetDomain
          .replace(/\\/g, '\\\\')  // Escape backslashes first
          .replace(/\//g, '\\/')}/g' /etc/apk/repositories && apk update -f`;
      } catch (error) {
        this.logger.error('Failed to read /etc/apk/repositories', error);
      }
    }

    if (!command) {
      this.sockService.sendMessage({
        type: 'updateLinuxMirror',
        message: 'No supported package manager found or mirror not configured',
      });
      return;
    }

    this.scheduleService.runTask(
      command,
      {
        onStart: async (cp) => {
          res?.setHeader('QL-Task-Pid', `${cp.pid}`);
          res?.end();
        },
        onEnd: async () => {
          this.sockService.sendMessage({
            type: 'updateLinuxMirror',
            message: 'update linux mirror end',
          });
          onEnd?.();
        },
        onError: async (message: string) => {
          this.sockService.sendMessage({ type: 'updateLinuxMirror', message });
        },
        onLog: async (message: string) => {
          this.sockService.sendMessage({ type: 'updateLinuxMirror', message });
        },
      },
      {
        command,
        id: 'update-linux-mirror',
        runOrigin: 'system',
      },
    );
  }

  public async checkUpdate() {
    try {
      const currentVersionContent = await parseVersion(config.versionFile);

      let lastVersionContent;
      try {
        const { body } = await request(
          `${config.lastVersionFile}?t=${Date.now()}`,
          {
            dispatcher: new Agent({
              keepAliveTimeout: 30000,
              keepAliveMaxTimeout: 30000,
            }),
          },
        );
        const text = await body.text();
        lastVersionContent = parseContentVersion(text);
      } catch (error) { }

      if (!lastVersionContent) {
        lastVersionContent = currentVersionContent;
      }

      return {
        code: 200,
        data: {
          hasNewVersion: this.checkHasNewVersion(
            currentVersionContent.version,
            lastVersionContent.version,
          ),
          lastVersion: lastVersionContent.version,
          lastLog: lastVersionContent.changeLog,
          lastLogLink: lastVersionContent.changeLogLink,
        },
      };
    } catch (error: any) {
      return {
        code: 400,
        message: error.message,
      };
    }
  }

  private checkHasNewVersion(curVersion: string, lastVersion: string) {
    const curArr = curVersion.split('.').map((x) => parseInt(x, 10));
    const lastArr = lastVersion.split('.').map((x) => parseInt(x, 10));
    if (curArr[0] < lastArr[0]) {
      return true;
    }
    if (curArr[0] === lastArr[0] && curArr[1] < lastArr[1]) {
      return true;
    }
    if (
      curArr[0] === lastArr[0] &&
      curArr[1] === lastArr[1] &&
      curArr[2] < lastArr[2]
    ) {
      return true;
    }
    return false;
  }

  public async updateSystem() {
    const cp = spawn('real_time=true ql update false', { shell: '/bin/bash' });

    cp.stdout.on('data', (data) => {
      this.sockService.sendMessage({
        type: 'updateSystemVersion',
        message: data.toString(),
      });
    });

    cp.stderr.on('data', (data) => {
      this.sockService.sendMessage({
        type: 'updateSystemVersion',
        message: data.toString(),
      });
    });

    cp.on('error', (err) => {
      this.sockService.sendMessage({
        type: 'updateSystemVersion',
        message: JSON.stringify(err),
      });
    });

    return { code: 200 };
  }

  public async reloadSystem(target?: 'system' | 'data') {
    const cmd = `real_time=true ql reload ${target || ''}`;
    const cp = spawn(cmd, {
      shell: '/bin/bash',
      detached: true,
      stdio: 'ignore',
    });
    cp.unref();
    setTimeout(() => {
      process.exit(0);
    });
    return { code: 200 };
  }

  public async notify({
    title,
    content,
    notificationInfo,
  }: {
    title: string;
    content: string;
    notificationInfo?: NotificationInfo;
  }) {
    const typeString =
      typeof notificationInfo?.type === 'number'
        ? NotificationModeStringMap[notificationInfo.type]
        : undefined;
    if (notificationInfo && typeString) {
      notificationInfo.type = typeString;
    }
    const isSuccess = await this.notificationService.notify(
      title,
      content,
      notificationInfo,
    );
    if (isSuccess) {
      return { code: 200, message: '通知发送成功' };
    } else {
      return { code: 400, message: '通知发送失败，请检查系统设置/通知配置' };
    }
  }

  public async run({ command, logPath }: { command: string; logPath?: string }, callback: TaskCallbacks) {
    if (!command.startsWith(TASK_COMMAND)) {
      command = `${TASK_COMMAND} ${command}`;
    }
    const logPathPrefix = logPath ? `real_log_path=${logPath}` : ''
    this.scheduleService.runTask(`${logPathPrefix} real_time=true ${command}`, callback, {
      command,
      id: command.replace(/ /g, '-'),
      runOrigin: 'system',
    });
  }

  public async stop({ command, pid }: { command: string; pid: number }) {
    if (!pid && !command) {
      return { code: 400, message: '参数错误' };
    }

    if (pid) {
      await killTask(pid);
      return { code: 200 };
    }

    if (!command.startsWith(TASK_COMMAND)) {
      command = `${TASK_COMMAND} ${command}`;
    }
    const _pid = await getPid(command);
    if (_pid) {
      await killTask(_pid);
      return { code: 200 };
    } else {
      return { code: 400, message: '任务未找到' };
    }
  }

  public async exportData(res: Response, type?: string[]) {
    try {
      let dataDirs = ['db', 'upload'];
      if (type && type.length) {
        dataDirs = dataDirs.concat(type.filter((x) => x !== 'base'));
      }
      const dataPaths = dataDirs.map((dir) => `data/${dir}`);
      await promiseExec(
        `cd ${config.dataPath} && cd ../ && tar -zcvf ${config.dataTgzFile
        } ${dataPaths.join(' ')}`,
      );
      res.download(config.dataTgzFile);
    } catch (error: any) {
      return res.send({ code: 400, message: error.message });
    }
  }

  public async importData() {
    try {
      await promiseExec(`rm -rf ${path.join(config.tmpPath, 'data')}`);
      const res = await promiseExec(
        `cd ${config.tmpPath} && tar -zxvf ${config.dataTgzFile}`,
      );
      return { code: 200, data: res };
    } catch (error: any) {
      return { code: 400, message: error.message };
    }
  }

  public async getSystemLog(
    res: Response,
    query: {
      startTime?: string;
      endTime?: string;
    },
  ) {
    const startTime = dayjs(query.startTime || undefined)
      .startOf('d')
      .valueOf();
    const endTime = dayjs(query.endTime || undefined)
      .endOf('d')
      .valueOf();
    const result = await readDirs(config.systemLogPath, config.systemLogPath);
    const logs = result
      .reverse()
      .filter((x) => x.title.endsWith('.log'))
      .filter((x) => x.createTime >= startTime && x.createTime <= endTime);

    res.set({
      'Content-Length': sum(logs.map((x) => x.size)),
    });
    (function sendFiles(res, fileNames) {
      if (fileNames.length === 0) {
        res.end();
        return;
      }

      const currentLog = fileNames.shift();
      if (currentLog) {
        const currentFileStream = fs.createReadStream(
          path.join(config.systemLogPath, currentLog.title),
        );
        currentFileStream.on('end', () => {
          sendFiles(res, fileNames);
        });
        currentFileStream.pipe(res, { end: false });
      }
    })(res, logs);
  }

  public async deleteSystemLog() {
    const result = await readDirs(config.systemLogPath, config.systemLogPath);
    const logs = result.reverse().filter((x) => x.title.endsWith('.log'));
    for (const log of logs) {
      await rmPath(path.join(config.systemLogPath, log.title));
    }
  }

  public async updateTimezone(info: SystemModelInfo) {
    if (!info.timezone) {
      info.timezone = 'Asia/Shanghai';
    }
    const oDoc = await this.getSystemConfig();
    await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    const success = await setSystemTimezone(info.timezone);
    if (success) {
      return { code: 200, data: info };
    } else {
      return { code: 400, message: '设置时区失败' };
    }
  }

  public async updateGlobalSshKey(info: SystemModelInfo) {
    const oDoc = await this.getSystemConfig();
    const result = await this.updateAuthDb({
      ...oDoc,
      info: { ...oDoc.info, ...info },
    });
    
    // Apply the global SSH key
    const SshKeyService = require('./sshKey').default;
    const Container = require('typedi').Container;
    const sshKeyService = Container.get(SshKeyService);
    
    if (info.globalSshKey) {
      await sshKeyService.addGlobalSSHKey(info.globalSshKey, 'global');
    } else {
      await sshKeyService.removeGlobalSSHKey('global');
    }
    
    return { code: 200, data: result };
  }

  public async cleanDependence(type: 'node' | 'python3') {
    if (!type || !['node', 'python3'].includes(type)) {
      return { code: 400, message: '参数错误' };
    }
    try {
      const finalPath = path.join(config.dependenceCachePath, type);
      await fs.promises.rm(finalPath, { recursive: true });
    } catch (error) { }
    return { code: 200 };
  }
}