Commands.ts

import { Television } from "./Television"

export interface Command {

    execute(): void
}

export class VolumeUpCommand implements Command {

    tv: Television

    constructor(_tv: Television){
        this.tv = _tv
    }

    execute(): void {

        console.log("Turning volume up")
        this.tv.operation("volup")
        console.log(`Volume is now ${this.tv.getVolume()}`)
    }
}

export class VolumeDownCommand implements Command {

    tv: Television

    constructor(_tv: Television){
        this.tv = _tv
    }

    execute(): void {
        
        console.log("Turning volume down")
        this.tv.operation("voldown")
        console.log(`Volume is now ${this.tv.getVolume()}`)
    }
}

export class ChannelUpCommand implements Command {

    tv: Television

    constructor(_tv: Television){
        this.tv = _tv
    }

    execute(): void {

        console.log("Turning channel up")
        this.tv.operation("chup")
        console.log(`Channel is now ${this.tv.getChannel()}`)
    }
}

export class ChannelDownCommand implements Command {

    tv: Television

    constructor(_tv: Television){
        this.tv = _tv
    }

    execute(): void {
        
        console.log("Turning channel down")
        this.tv.operation("chdown")
        console.log(`Channel is now ${this.tv.getChannel()}`)
    }
}