import { Service, Inject } from 'typedi';
import winston from 'winston';
import nodeSchedule from 'node-schedule';
import { ChildProcessWithoutNullStreams } from 'child_process';
import {
  ToadScheduler,
  LongIntervalJob,
  SimpleIntervalSchedule,
  Task,
} from 'toad-scheduler';
import dayjs from 'dayjs';
import taskLimit from '../shared/pLimit';
import { spawn } from 'cross-spawn';

export interface ScheduleTaskType {
  id: number;
  command: string;
  name?: string;
  schedule?: string;
}

export interface TaskCallbacks {
  onBefore?: (startTime: dayjs.Dayjs) => Promise<void>;
  onStart?: (
    cp: ChildProcessWithoutNullStreams,
    startTime: dayjs.Dayjs,
  ) => Promise<void>;
  onEnd?: (
    cp: ChildProcessWithoutNullStreams,
    endTime: dayjs.Dayjs,
    diff: number,
  ) => Promise<void>;
  onLog?: (message: string) => Promise<void>;
  onError?: (message: string) => Promise<void>;
}

@Service()
export default class ScheduleService {
  private scheduleStacks = new Map<string, nodeSchedule.Job>();

  private intervalSchedule = new ToadScheduler();

  private maxBuffer = 200 * 1024 * 1024;

  constructor(@Inject('logger') private logger: winston.Logger) { }

  async runTask(
    command: string,
    callbacks: TaskCallbacks = {},
    params: {
      schedule?: string;
      name?: string;
      command?: string;
    },
    completionTime: 'start' | 'end' = 'end',
  ) {
    return taskLimit.runWithCronLimit(() => {
      return new Promise(async (resolve, reject) => {
        this.logger.info(`[panel][开始执行任务] 参数 ${JSON.stringify({ ...params, command })}`);

        try {
          const startTime = dayjs();
          await callbacks.onBefore?.(startTime);

          const cp = spawn(command, { shell: '/bin/bash' });

          callbacks.onStart?.(cp, startTime);
          completionTime === 'start' && resolve(cp.pid);

          cp.stdout.on('data', async (data) => {
            await callbacks.onLog?.(data.toString());
          });

          cp.stderr.on('data', async (data) => {
            this.logger.info(
              '[panel][执行任务失败] 命令: %s, 错误信息: %j',
              command,
              data.toString(),
            );
            await callbacks.onError?.(data.toString());
          });

          cp.on('error', async (err) => {
            this.logger.error(
              '[panel][创建任务失败] 命令: %s, 错误信息: %j',
              command,
              err,
            );
            await callbacks.onError?.(JSON.stringify(err));
          });

          cp.on('close', async (code) => {
            const endTime = dayjs();
            await callbacks.onEnd?.(
              cp,
              endTime,
              endTime.diff(startTime, 'seconds'),
            );
            resolve({ ...params, pid: cp.pid, code });
          });
        } catch (error) {
          this.logger.error(
            '[panel][执行任务失败] 命令: %s, 错误信息: %j',
            command,
            error,
          );
          await callbacks.onError?.(JSON.stringify(error));
        }
      });
    });
  }

  async createCronTask(
    { id = 0, command, name, schedule = '' }: ScheduleTaskType,
    callbacks?: TaskCallbacks,
    runImmediately = false,
  ) {
    const _id = this.formatId(id);
    this.logger.info(
      '[panel][创建cron任务], 任务ID: %s, cron: %s, 任务名: %s, 执行命令: %s',
      _id,
      schedule,
      name,
      command,
    );

    this.scheduleStacks.set(
      _id,
      nodeSchedule.scheduleJob(_id, schedule, async () => {
        this.runTask(command, callbacks, {
          name,
          schedule,
          command,
        });
      }),
    );

    if (runImmediately) {
      this.runTask(command, callbacks, {
        name,
        schedule,
        command,
      });
    }
  }

  async cancelCronTask({ id = 0, name }: ScheduleTaskType) {
    const _id = this.formatId(id);
    this.logger.info('[panel][取消定时任务], 任务名: %s', name);
    if (this.scheduleStacks.has(_id)) {
      this.scheduleStacks.get(_id)?.cancel();
      this.scheduleStacks.delete(_id);
    }
  }

  async createIntervalTask(
    { id = 0, command, name = '' }: ScheduleTaskType,
    schedule: SimpleIntervalSchedule,
    runImmediately = true,
    callbacks?: TaskCallbacks,
  ) {
    const _id = this.formatId(id);
    this.logger.info(
      '[panel][创建interval任务], 任务ID: %s, 任务名: %s, 执行命令: %s',
      _id,
      name,
      command,
    );
    const task = new Task(
      name,
      () => {
        this.runTask(command, callbacks, {
          name,
          command,
        });
      },
      (err) => {
        this.logger.error(
          '[执行任务失败] 命令: %s, 错误信息: %j',
          command,
          err,
        );
      },
    );

    const job = new LongIntervalJob(
      { runImmediately: false, ...schedule },
      task,
      _id,
    );

    this.intervalSchedule.addIntervalJob(job);

    if (runImmediately) {
      this.runTask(command, callbacks, {
        name,
        command,
      });
    }
  }

  async cancelIntervalTask({ id = 0, name }: ScheduleTaskType) {
    const _id = this.formatId(id);
    this.logger.info('[取消interval任务], 任务ID: %s, 任务名: %s', _id, name);
    this.intervalSchedule.removeById(_id);
  }

  private formatId(id: number): string {
    return String(id);
  }
}