import * as THREE from 'three';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

class Pyramid extends THREE.Object3D {
    constructor() {
        super();

        let width  = 1;
        let height = 1;
        let length = 2;

        let vertices = [
            new THREE.Vector3(     0,       0,      0),
            new THREE.Vector3( width,  height, length),
            new THREE.Vector3(-width,  height, length),
            new THREE.Vector3(-width, -height, length),
            new THREE.Vector3( width, -height, length),
        ]

        // Faces
        {
            let material = new THREE.MeshPhongMaterial({color: 0xffffff});
            material.transparent = true;
            material.opacity = 0.8;

            let geometry = new THREE.BufferGeometry();
            let faces = [
                // Sides of the pyramid
                [0, 2, 1],
                [0, 3, 2],
                [0, 4, 3],
                [0, 1, 4],

                // Base of the pyramid
                [1, 2, 3],
                [1, 3, 4],
            ]

            let buffer = new Float32Array(3 * 3 * faces.length);

            for (let faceIndex in faces) {
                let face = faces[faceIndex];
                buffer[faceIndex * 3 * 3 + 0] = vertices[face[0]].x;
                buffer[faceIndex * 3 * 3 + 1] = vertices[face[0]].y;
                buffer[faceIndex * 3 * 3 + 2] = vertices[face[0]].z;

                buffer[faceIndex * 3 * 3 + 3] = vertices[face[1]].x;
                buffer[faceIndex * 3 * 3 + 4] = vertices[face[1]].y;
                buffer[faceIndex * 3 * 3 + 5] = vertices[face[1]].z;

                buffer[faceIndex * 3 * 3 + 6] = vertices[face[2]].x;
                buffer[faceIndex * 3 * 3 + 7] = vertices[face[2]].y;
                buffer[faceIndex * 3 * 3 + 8] = vertices[face[2]].z;
            }


            geometry.setAttribute('position', new THREE.BufferAttribute(buffer, 3));
            const mesh = new THREE.Mesh(geometry, material);
            this.add(mesh);
        }

        // Lines
        {
            let material = new THREE.LineBasicMaterial({color: 0xff0000});
            let geometry = new THREE.BufferGeometry();

            let width  = 1;
            let height = 1;
            let length = 2;



            let lines = [
                [0, 1],
                [0, 2],
                [0, 3],
                [0, 4],
                [1, 2],
                [2, 3],
                [3, 4],
                [4, 1],
            ]

            let buffer = new Float32Array(2 * 3 * lines.length);

            for (let lineIndex in lines) {
                let line = lines[lineIndex];
                buffer[lineIndex * 2 * 3 + 0] = vertices[line[0]].x;
                buffer[lineIndex * 2 * 3 + 1] = vertices[line[0]].y;
                buffer[lineIndex * 2 * 3 + 2] = vertices[line[0]].z;

                buffer[lineIndex * 2 * 3 + 3] = vertices[line[1]].x;
                buffer[lineIndex * 2 * 3 + 4] = vertices[line[1]].y;
                buffer[lineIndex * 2 * 3 + 5] = vertices[line[1]].z;
            }


            geometry.setAttribute('position', new THREE.BufferAttribute(buffer, 3));
            const mesh = new THREE.Line(geometry, material);
            this.add(mesh);
        }
    }
}

let renderer, scene, camera, controls, leds, cameraObject, domElement, raycaster, pointer, selectedObject;

async function init(dataPath, domElementArg = document.body) {
    let request = await fetch('/api/calibration-data');
    let data = await request.json();

    domElement = domElementArg;
    let w = domElement === document.body ? window.innerWidth : domElement.offsetWidth;
    let h = domElement === document.body ? window.innerHeight : domElement.offsetHeight;

    raycaster = new THREE.Raycaster();

    camera = new THREE.PerspectiveCamera(45, w / h, 0.001, 1000);
    camera.position.set(0, 0, -50);

    scene = new THREE.Scene();

    leds = new THREE.Object3D();

    for (let key in data) {
        let row = data[key];
        const geometry = new THREE.SphereGeometry(1, 32, 16);
        const material = new THREE.MeshPhongMaterial({ color: 0xffff00 });
        let sphere = new THREE.Mesh(geometry, material);
        sphere.position.x = row[0];
        sphere.position.y = row[1];
        sphere.position.z = row[2];
        sphere.name = key
        leds.add(sphere);
    }

    scene.add(leds);

    cameraObject = new Pyramid();
    scene.add(cameraObject);

    const axesHelper = new THREE.AxesHelper(10);
    scene.add(axesHelper);

    const directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
    scene.add(directionalLight);

    const ambientLight = new THREE.AmbientLight(0xffffff, 0.25);
    scene.add(ambientLight);

    renderer = new THREE.WebGLRenderer({antialias: true, alpha: true});
    renderer.setAnimationLoop(animate);

    selectedObject = document.getElementById('selected-object');

    // Add listeners
    controls = new OrbitControls(camera, renderer.domElement);
    controls.update();

    window.addEventListener('pointermove', onPointerMove);
    window.addEventListener('resize', onWindowResize, false);
    onWindowResize();

    domElement.appendChild(renderer.domElement);
}

function animate(time) {
    controls.update();


    if (pointer !== undefined) {
        raycaster.setFromCamera(pointer, camera);
        const intersects = raycaster.intersectObjects(leds.children);
        if (intersects.length > 0) {
            for (let led of leds.children) {
                if (led === intersects[0].object) {
                    led.material.color.setHex(0xff0000);
                    selectedObject.innerText = led.name;
                } else {
                    led.material.color.setHex(0xffff00);
                }
            }
        }
    }

    renderer.render(scene, camera);
}

function onWindowResize() {
    let w = domElement === document.body ? window.innerWidth : domElement.offsetWidth;
    let h = domElement === document.body ? window.innerHeight : domElement.offsetHeight;

    camera.aspect = w / h;
    camera.updateProjectionMatrix();

    renderer.setSize(w, h);
}

function onPointerMove(event) {
    // calculate pointer position in normalized device coordinates
    // (-1 to +1) for both components

    if (pointer === undefined) {
        pointer = new THREE.Vector2();
    }
    let w = domElement === document.body ? window.innerWidth : domElement.offsetWidth;
    let h = domElement === document.body ? window.innerHeight : domElement.offsetHeight;
    pointer.x = (event.offsetX / w) * 2 - 1;
    pointer.y = - (event.offsetY / h) * 2 + 1;
}

export { init };