Pianist_JS

function solve(input) {
    let commands = {
        Add,
        Remove,
        ChangeKey
    }
    let allPieces = {}
    let number = Number(input.shift())
    for (let i = 0; i < number; i++) {
        let [newPiece, composer, key] = input.shift().split("|")
        allPieces[newPiece] = {
            composer,
            key
        }
    }
    while (input.length > 0) {
        let [command, ...params] = input.shift().split('|')
        if (command === 'Stop') {
            break
        }
        commands[command](allPieces, ...params)


    }
    //"{Piece} -> Composer: {composer}, Key: {key}"
    listed = Object
        .keys(allPieces)
        .sort((a, b) => allPieces[a].composer.localeCompare(allPieces[b].composer))
    for (piece of listed) {
        console.log(`${piece} -> Composer: ${allPieces[piece].composer}, Key: ${allPieces[piece].key}`)
    }




    function Add(allPieces, piece, composer, key) {
        if (allPieces.hasOwnProperty(piece)) {
            console.log(`${piece} is already in the collection!`)
            return
        }
        allPieces[piece] = {
            composer,
            key
        }
        console.log(`${piece} by ${composer} in ${key} added to the collection!`)
    }

    function Remove(allPieces, piece) {
        if (!allPieces.hasOwnProperty(piece)) {
            console.log(`Invalid operation! ${piece} does not exist in the collection.`)
            return
        }
        delete allPieces[piece]
        console.log(`Successfully removed ${piece}!`)

    }

    function ChangeKey(allPieces, piece, newKey) {
        if (!allPieces.hasOwnProperty(piece)) {
            console.log(`Invalid operation! ${piece} does not exist in the collection.`)
            return
        }
        allPieces[piece].key = newKey
        console.log(`Changed the key of ${piece} to ${newKey}!`)
    }


}

solve([
    '4',
    'Eine kleine Nachtmusik|Mozart|G Major',
    'La Campanella|Liszt|G# Minor',
    'The Marriage of Figaro|Mozart|G Major',
    'Hungarian Dance No.5|Brahms|G Minor',
    'Add|Spring|Vivaldi|E Major',
    'Remove|The Marriage of Figaro',
    'Remove|Turkish March',
    'ChangeKey|Spring|C Major',
    'Add|Nocturne|Chopin|C# Minor',
    'Stop'
])