anote

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import { Keywords } from "../flows/Keywords";
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import { Command } from "./Command";
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import MessageStore from "../service/MessageStore";
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import Saver from "../service/Saver";
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export class Add extends Command {
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    messageNumber = 5;
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    async execute(): Promise<string> {
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        if(!this.isValid(Keywords.ADD)) return '[ADD] Not valid command.';
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        const tail: string = this.getTail();
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        if(tail === '/') {
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            const input: string = MessageStore.getPreviousValue();
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            return await new Saver().appendLine("default.txt", input);
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        }
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        if(this.isValidMessageNumber(tail))
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            return await new Saver().appendLine("default.txt", MessageStore.getPreviousValue(tail as unknown as number));
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        return '[ADD] Index out of range';
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    }
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    private isValidMessageNumber(tail: string): boolean {
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        let flag: boolean = false;
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        for(let i=0; i<this.messageNumber; i++){
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            if(tail === i.toString())
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                flag = true;
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        }
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        return flag;
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    }
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}
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