class Input {
    constructor(idCanvas) {
        this.keysDown = new Set()
        this.dir = 0;
        
        this.canvas = document.getElementById(idCanvas);

        this.canvas.addEventListener("click", (e) => {
            if(player==null || bullets==null){
                return;
            }

            let bounds = this.canvas.getBoundingClientRect();

            let mouseX = (e.clientX - bounds.x)*this.canvas.width/bounds.width;
            let mouseY = (e.clientY - bounds.y)*this.canvas.height/bounds.height;

            if(player.x>=2000 && player.y>=2000) {
                mouseX+=2000;
                mouseY+=2000;
            }
            
            let dx = mouseX-player.x;
            let dy = mouseY-player.y;

            let norm = Math.sqrt(dx*dx+dy*dy);

            let b = new Bullet(player.x,player.y,dx/norm,dy/norm,player.id);
            bullets.push(b);

            net.newBullet(b.x,b.y,b.dx,b.dy,b.parentId);
        });

        window.addEventListener("keydown", (e)=>{
            //blocks the action of the key (cf. Killian)
            if(["Space","ArrowUp","ArrowDown","ArrowLeft","ArrowRight"].indexOf(e.code) > -1) {
                e.preventDefault();
            }
            this.keysDown.add(e.key.toLowerCase())
            this.updateDir();
        })

        window.addEventListener("keyup", (e)=>{
            this.keysDown.delete(e.key.toLowerCase())
            this.updateDir();
        })
    }

    updateDir(){
        if(player==null)
            return;

        let oldDir=this.dir;

        this.dir=0;
        if(this.keysDown.has('z') || this.keysDown.has('arrowup')){
            if(this.keysDown.has('d') || this.keysDown.has('arrowright')){
                this.dir = 2;
            }else if(this.keysDown.has('s') || this.keysDown.has('arrowdown')){
                this.dir = 0;
            }else if(this.keysDown.has('q') || this.keysDown.has('arrowleft')){
                this.dir = 8;
            }else{
                this.dir = 1;
            }
        }else if(this.keysDown.has('d') || this.keysDown.has('arrowright')){
            if(this.keysDown.has('s') || this.keysDown.has('arrowdown')){
                this.dir = 4;
            }else if(this.keysDown.has('q') || this.keysDown.has('arrowleft')){
                this.dir = 0;
            }else{
                this.dir = 3;
            }
        }else if(this.keysDown.has('s') || this.keysDown.has('arrowdown')){
            if(this.keysDown.has('q') || this.keysDown.has('arrowLeft')){
                this.dir = 6;
            }else{
                this.dir = 5;
            }
        }else if(this.keysDown.has('q') || this.keysDown.has('arrowleft')){
            this.dir = 7;
        }
        if(oldDir!=this.dir)
        {
            player.changeDirection(this.dir);
            net.update(player);
        }
    }

    /*
    calculateAngle(playerX, playerY) {
        return Math.atan2(this.mouseY - playerY, this.mouseX - playerX);
    }
    */
}