export {};

class CircularQueue {
    private data: number[];
    private front: number;
    private rear: number
    private size: number;

    constructor(size: number){
        this.size = size;
        this.rear = -1;
        this.front = -1;
        this.data = Array.from({length: size}, () => 0);
    }

    public isEmpty(): boolean{
        return this.front === -1;
    }

    public isFull(): boolean{
        return (this.rear + 1)%(this.size) === this.front;
    }

    public enqueue(value: number){
        if(this.isFull()){
            console.log("Queue is full!");
            return;
        }
        if(this.isEmpty()){
            this.front = 0;
        }

        this.rear = (this.rear + 1)%(this.size);
        this.data[this.rear] = value;
    }

    public dequeue(): number | undefined {
        if(this.isEmpty()) return undefined;
        const value: number = this.data[this.front];
        if(this.rear === this.front) {
            this.rear = -1;
            this.front = -1;
        }
        else {
            this.front = (this.front + 1)%(this.size);
        }
        return value;
    }

    public peek(): number | undefined {
        return (this.isEmpty()) ? undefined : this.data[this.front];
    }

    public info() {
        if(this.isEmpty()){
            console.log("Empty!");
            return;
        }
        let result = "list : [";
        let i = this.front;
        while(true){
            result += this.data[i].toString();
            if(i === this.rear){
                result += "]";
                break;
            }
            i = (i+1)%(this.size);
            result += ",";
        }
        console.log(result);
    }
}

console.log("원형큐를 생성합니다. 사이즈를 입력해주세요.")
const size: number = Number(require("fs").readFileSync(0,"utf8").toString().trim());
let cq = new CircularQueue(size);
let exitFlag: boolean = true;

while(exitFlag){
    console.log("++++++++++++++++명령어모음++++++++++++++++");
    console.log("enqueue <value> | dequeue | peek | info | exit");
    console.log("========================================");
    console.log("명령어를 입력해주세요!");
    const input:string[] = require("fs").readFileSync(0,"utf8").toString().trim().split(" ");
    switch(input[0])
    {
        case "enqueue":
            cq.enqueue(Number(input[1]));
            break;
        case "dequeue":
            const deqvalue = cq.dequeue();
            console.log(deqvalue===undefined ? "큐가 비었습니다." : deqvalue);
            break;
        case "peek":
            const peekValue = cq.peek();
            console.log(peekValue===undefined ? "큐가 비었습니다." : peekValue);
            break;
        case "info":
            cq.info();
            break;
        case "exit":
            exitFlag = false;
            console.log("종료합니다.")
            break;
        default:
            console.log("제대로 입력해주세요.")
            break; 
    }
}