import { Transactionable } from '@tachybase/database';

import type Plugin from '../Plugin';
import type Processor from '../Processor';
import type { FlowNodeModel } from '../types';

export interface IJob {
  status: number;
  result?: unknown;
  [key: string]: unknown;
}

export type InstructionResult = IJob | Promise<IJob> | null;

export type Runner = (node: FlowNodeModel, input: any, processor: Processor) => InstructionResult;

export type InstructionInterface = {
  run: Runner;
  resume?: Runner;
  getScope?: (node: FlowNodeModel, data: any, processor: Processor) => any;
  duplicateConfig?: (node: FlowNodeModel, options: Transactionable) => object | Promise<object>;
};

// what should a instruction do?
// - base on input and context, do any calculations or system call (io), and produce a result or pending.
export abstract class Instruction implements InstructionInterface {
  constructor(public workflow: Plugin) {}

  abstract run(node: FlowNodeModel, input: any, processor: Processor): InstructionResult;
}

export default Instruction;
