// TaskChain chains tasks
// and extends Task

import * as plugins from './taskbuffer.plugins.js';
import { Task } from './taskbuffer.classes.task.js';
import { logger } from './taskbuffer.logging.js';

export class Taskchain extends Task {
  taskArray: Task[];
  constructor(optionsArg: {
    taskArray: Task[];
    name?: string;
    log?: boolean;
    buffered?: boolean;
    bufferMax?: number;
  }) {
    const options = {
      ...{
        name: 'unnamed Taskchain',
        log: false,
      },
      ...optionsArg,
      ...{
        taskFunction: (x: any) => {
          // this is the function that gets executed when TaskChain is triggered
          const done = plugins.smartpromise.defer(); // this is the starting Deferred object
          let taskCounter = 0; // counter for iterating async over the taskArray
          const iterateTasks = (x: any) => {
            if (typeof this.taskArray[taskCounter] !== 'undefined') {
              logger.log('info', `${this.name} running: Task ${this.taskArray[taskCounter].name}`);
              this.taskArray[taskCounter].trigger(x).then((x) => {
                logger.log('info', this.taskArray[taskCounter].name);
                taskCounter++;
                iterateTasks(x);
              }).catch((err) => {
                const chainError = new Error(
                  `Taskchain "${this.name}": task "${this.taskArray[taskCounter].name || 'unnamed'}" (index ${taskCounter}) failed: ${err instanceof Error ? err.message : String(err)}`
                );
                (chainError as any).cause = err;
                done.reject(chainError);
              });
            } else {
              logger.log('info', `Taskchain "${this.name}" completed successfully`);
              done.resolve(x);
            }
          };
          iterateTasks(x);
          return done.promise;
        },
      },
    };
    super(options);
    this.taskArray = optionsArg.taskArray;
  }
  addTask(taskArg: Task) {
    this.taskArray.push(taskArg);
  }
  removeTask(taskArg: Task): boolean {
    const index = this.taskArray.indexOf(taskArg);
    if (index === -1) {
      return false;
    }
    this.taskArray.splice(index, 1);
    return true;
  }
  shiftTask(): Task | undefined {
    return this.taskArray.shift();
  }
}