/* Copyright (C) 2024 Sebastián Santisi <ssantisi@fi.uba.ar>, CSC-CONICET */
import * as THREE from 'three';

class Screen {
    static isMobile = 'ontouchstart' in document.documentElement;

    constructor(camera, renderer, center) {
        this.camera = camera;
        this.renderer = renderer;
        this.center = center;
        this.cbmove = null;

        this.raycaster = new THREE.Raycaster();
        this.pointerScreen = new THREE.Vector2();
        this.pointerWorld = new THREE.Vector3();

        this.radius = 26;
        this.phi = -0.5;
        this.theta = 0.45;
        this.z = 15;
        this.aspect = 1.94;

        this.clicked = false;

        this.camera.setFocalLength(60);

        if(Screen.isMobile) {
            window.addEventListener('touchstart', (event) => { this.onClick(event); });
            window.addEventListener('touchend', (event) => { this.onMouseUp(event); });
            window.addEventListener('touchmove', (event) => { this.onPointerMove(event); });
        }
        else {
            window.addEventListener('mouseup', (event) => { this.onMouseUp(event); });
            window.addEventListener('mousedown', (event) => { this.onClick(event); });
            window.addEventListener('pointermove', (event) => { this.onPointerMove(event); });
        }
        window.addEventListener('resize', () => { this.onResize(); });
    }

    setMoveCallBack(cbmove) {
        this.cbmove = cbmove;
    }

    updatePointers(event) {
        if(Screen.isMobile) {
            var touch = event.touches[0] || event.changedTouches[0];
            var x = touch.pageX;
            var y = touch.pageY;
        }
        else {
            var x = event.clientX
            var y = event.clientY;
        }
        this.pointerScreen.x = (x / window.innerWidth) * 2 - 1;
        this.pointerScreen.y = -(y / window.innerHeight) * 2 + 1;
        this.raycaster.setFromCamera(this.pointerScreen, this.camera);

        var point = new THREE.Vector3(this.pointerScreen.x, this.pointerScreen.y, 0.5);
        point.unproject(this.camera); 
        point.sub(this.camera.position).normalize();
        var distance = -this.camera.position.z / point.z;
        this.pointerWorld.copy(this.camera.position).add(point.multiplyScalar(distance));
    }

    onClick(event) {
        this.clicked = true;
        this.updatePointers(event);
    }

    onMouseUp(event) {
        this.clicked = false;
        this.updatePointers(event);
        ws.move(this.pointerWorld, true);
        if(this.cbmove)
            this.cbmove(this.pointerWorld, true);
    }

    onPointerMove(event) {
        this.updatePointers(event);
        if(this.clicked) {
            if(this.cbmove)
                this.cbmove(this.pointerWorld, false);
        }
    }

    onResize() {
        this.camera.aspect = window.innerWidth / window.innerHeight;
        this.camera.fov = 15;
        this.camera.updateProjectionMatrix();

        var r;
        if(this.camera.aspect > this.aspect)
            r = this.radius;
        else {
            r = this.radius * this.aspect / this.camera.aspect;
        }

        this.renderer.setSize(window.innerWidth, window.innerHeight);
        document.getElementById("container").style.height = window.innerHeight;
        document.getElementById("container").style.width = window.innerWidth;
        document.getElementById("rotate").style.display = this.camera.aspect > 1 ? "none" : "block";

        var theta = Math.PI / 2 - this.theta;
        var phi = this.phi - Math.PI / 2;
        var x = r * Math.sin(theta) * Math.cos(phi) + this.center.x;
        var y = r * Math.sin(theta) * Math.sin(phi) + this.center.y;
        var z = r * Math.cos(theta) + this.center.z;

        this.camera.position.set(x, y, z);
        this.camera.up = new THREE.Vector3(0,0,1);
        this.camera.lookAt(this.center);

        this.raycaster.setFromCamera(this.pointerScreen, this.camera);
    }
}

export { Screen };