var isInteractive = true;
var width, height;

var scene, camera, renderer, light;
var controls;
var terrain;
var cubemapRT, cubeRenderTarget;
var composer;
var message = document.querySelector(".message")
var hammer;

var mouse = {x:0, y:0};
var isMobile = typeof window.orientation !== 'undefined'

var palleteBlack = {
  colors:[
    { c: "#111111", l:5 },
    { c: "#ed254e", l:1 },
    { c: "#f9dc5c", l:1 },
    { c: "#c2eabd", l:1 },
    { c: "#011936", l:1 },
    { c: "#465362", l:1 },
  ],
  
  
  topColor:null,
  repeat:10,
  shuffle:true,
  texture:null,
}


var palleteObj = palleteBlack

function init(){
  
  textureLoader = new THREE.TextureLoader();
  
  palleteObj.texture = textureLoader.load(createPalleteImg(palleteObj))
  
  build()
}
var bl = true
function build(){
  
  setup();
  elements();

  
  if(isInteractive){
    hammer = new Hammer(document.body)
    hammer.get('pinch').set({ enable: true });
    hammer.on('pinch', function(ev) {
      c.yd = ev.scale
    });

    message.innerHTML = isMobile ? "DRAG AND PINCH!" : "MOVE!"
    message.style.display = "block"
    window.addEventListener(isMobile ? "touchstart" : "mousemove", function(){
      message.style.display = "none"
      
    })
  }

  render();
  
  
  if(isMobile)
    window.addEventListener("touchmove", mousemove, {passive:false})
  else
    window.addEventListener("mousemove", mousemove)
  
  window.addEventListener("resize", resize)
  resize()

  
}

function setup(){
  scene = new THREE.Scene();
  var fogColor = new THREE.Color( 0xffffff )
  scene.background = fogColor;
  scene.fog = new THREE.Fog(fogColor, 10, 400);

  
  sky()

  camera = new THREE.PerspectiveCamera(60, width / height, .1, 10000);
  camera.position.y = 8;
  camera.position.z = 4;
  
  ambientLight = new THREE.AmbientLight(0xffffff, 1);
  scene.add(ambientLight)
  

  renderer = new THREE.WebGLRenderer( {antialias:true} );
  renderer.setPixelRatio = devicePixelRatio;
  renderer.setSize(width, height);
  

  document.body.appendChild(renderer.domElement)
  

}


function sky(){
  sky = new THREE.Sky();
  sky.scale.setScalar( 450000 );
  sky.material.uniforms.turbidity.value = 20;
  sky.material.uniforms.rayleigh.value = 0;
  sky.material.uniforms.luminance.value = 1;
  sky.material.uniforms.mieCoefficient.value = 0.01;
  sky.material.uniforms.mieDirectionalG.value = 0.8;
  
  scene.add( sky );

  sunSphere = new THREE.Mesh(
    new THREE.SphereBufferGeometry( 20000, 16, 8 ),
    new THREE.MeshBasicMaterial( { color: 0xffffff } )
  );
  sunSphere.visible = false;
  scene.add( sunSphere );
  
  var theta = Math.PI * ( -0.02 );
	var phi = 2 * Math.PI * ( -.25 );

  sunSphere.position.x = 400000 * Math.cos( phi );
  sunSphere.position.y = 400000 * Math.sin( phi ) * Math.sin( theta );
  sunSphere.position.z = 400000 * Math.sin( phi ) * Math.cos( theta );
  
  sky.material.uniforms.sunPosition.value.copy( sunSphere.position );
}

function elements(){
  var w= 100
  var h = 400
  var geometry = new THREE.PlaneBufferGeometry(w, h,400, 400);
  
  var colorsBuffer = new Float32Array(geometry.attributes.position.count * 3)
  for ( var i = 0; i < colorsBuffer.length; i++ ) {
    colorsBuffer[ i ] = Math.random()
  }
  geometry.addAttribute( 'vColor', new THREE.BufferAttribute( colorsBuffer, 3 ) );
  
  var displaceBuffer = new Float32Array( geometry.attributes.position.count );
  for ( var i = 0; i < displaceBuffer.length; i++ ) {
    displaceBuffer[ i ] = Math.random()
  }
  geometry.addAttribute( 'vDisplace', new THREE.BufferAttribute( displaceBuffer, 1 ) );
  var material = new MeshCustomMaterial(
    {
      roughness:.7,
      metalness:0.1
    },
    {
      time: { type: "f", value: 0.0 },
      distortCenter: { type: "f", value: 0.1 },
      ticknessOffset: { type: "f", value: 0.0 },
      pallete:{ type: "t", value: null},
      speed: { type: "f", value: 2.0 },
      maxHeight: { type: "f", value: 10.0 },
    },
    document.getElementById("custom-vertex").textContent,
    document.getElementById("custom-fragment").textContent
  );

  
  terrain = new THREE.Mesh(geometry, material);
  terrain.position.y = h/2;

  
  container = new THREE.Object3D();
  container.add(terrain)
  container.position.y = 0
  container.position.z = 4
  container.rotation.x = -Math.PI / 2
  
  scene.add(container)
}

function createPalleteImg(palleteObj){
  var canvas = document.createElement("canvas");
  var ctx = canvas.getContext("2d");

  var pallete = expandPallete(palleteObj)

  var texH = 1024;
  var colorH = texH / pallete.length;

  canvas.width = 2;
  canvas.height = texH
  
  for(var i=0; i < pallete.length; i++){
    ctx.fillStyle = pallete[i];
    ctx.fillRect(0, colorH * i, canvas.width, colorH)

  }

  return canvas.toDataURL()

}

function expandPallete(palleteObj){
  var pallete = []
  for(var x=0; x < palleteObj.repeat; x++){
    for(var i=0; i < palleteObj.colors.length; i++){
      var colors = palleteObj.shuffle ? shuffle(palleteObj.colors.slice()) : palleteObj.colors;
      var c = colors[i];
      for(var j=0; j < c.l; j++){
        pallete.push(c.c);
      }
    }
  }
  if(palleteObj.topColor){
    pallete.push(palleteObj.topColor);
  }
  return pallete
}

function shuffle(o) {
	for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
	return o;
};


var c = {x:0, y:0, xd:0, yd:0};
function render(){
  requestAnimationFrame(render)
  
  var time = performance.now() * 0.001

  terrain.material.uniforms.pallete.value = palleteObj.texture;
  terrain.material.uniforms.time.value = time;
  
  if(isInteractive){
    c.xd = (mouse.x)*0.2;
    if(!isMobile)
      c.yd = mouse.y*5;

    if(c.yd < -.5) c.yd = -.5;
    c.x += (c.xd - c.x) * 0.08
    c.y += (c.yd - c.y) * 0.08
    
    terrain.material.uniforms.distortCenter.value = c.x;
    terrain.material.uniforms.ticknessOffset.value = c.y;
  }


  if(Math.sin(time + Math.PI) > 0.99){
    palleteObj.texture = textureLoader.load(createPalleteImg(palleteObj))
  }

  renderer.render(scene, camera)

  
}

function mousemove(e){
  e.preventDefault();
  
  var x, y
  if(e.type == "mousemove"){
    x = e.clientX;
    y = e.clientY;
  }else{
    x = e.changedTouches[0].clientX
    y = e.changedTouches[0].clientY
  }
  
  mouse.x = (x / width) - 0.5
  mouse.y = (y / height) - 0.5
  
}

function resize(){
  width = window.innerWidth
  height = window.innerHeight
  camera.aspect = width / height;
  camera.updateProjectionMatrix();

  renderer.setSize( width, height );

}

function MeshCustomMaterial (parameters, uniforms, vertexShader, fragmentShader) {
  THREE.MeshStandardMaterial.call( this );
  this.uniforms = THREE.UniformsUtils.merge([
    THREE.ShaderLib.standard.uniforms,
    uniforms
  ]);
  this.vertexShader = vertexShader;
  this.fragmentShader = fragmentShader;
  this.type = 'MeshCustomMaterial';
  this.setValues(parameters);
}

MeshCustomMaterial.prototype = Object.create( THREE.MeshStandardMaterial.prototype );
MeshCustomMaterial.prototype.constructor = MeshCustomMaterial;
MeshCustomMaterial.prototype.isMeshStandardMaterial = true;

window.onload = init

/**
 * @author zz85 / https://github.com/zz85
 *
 * Based on "A Practical Analytic Model for Daylight"
 * aka The Preetham Model, the de facto standard analytic skydome model
 * http://www.cs.utah.edu/~shirley/papers/sunsky/sunsky.pdf
 *
 * First implemented by Simon Wallner
 * http://www.simonwallner.at/projects/atmospheric-scattering
 *
 * Improved by Martin Upitis
 * http://blenderartists.org/forum/showthread.php?245954-preethams-sky-impementation-HDR
 *
 * Three.js integration by zz85 http://twitter.com/blurspline
*/

THREE.Sky = function () {

	var shader = THREE.Sky.SkyShader;

	var material = new THREE.ShaderMaterial( {
		fragmentShader: shader.fragmentShader,
		vertexShader: shader.vertexShader,
		uniforms: THREE.UniformsUtils.clone( shader.uniforms ),
		side: THREE.BackSide
	} );

	THREE.Mesh.call( this, new THREE.BoxBufferGeometry( 1, 1, 1 ), material );

};

THREE.Sky.prototype = Object.create( THREE.Mesh.prototype );

THREE.Sky.SkyShader = {

	uniforms: {
		luminance: { value: 1 },
		turbidity: { value: 2 },
		rayleigh: { value: 1 },
		mieCoefficient: { value: 0.005 },
		mieDirectionalG: { value: 0.8 },
		sunPosition: { value: new THREE.Vector3() }
	},

	vertexShader: [
		'uniform vec3 sunPosition;',
		'uniform float rayleigh;',
		'uniform float turbidity;',
		'uniform float mieCoefficient;',

		'varying vec3 vWorldPosition;',
		'varying vec3 vSunDirection;',
		'varying float vSunfade;',
		'varying vec3 vBetaR;',
		'varying vec3 vBetaM;',
		'varying float vSunE;',

		'const vec3 up = vec3( 0.0, 1.0, 0.0 );',

		// constants for atmospheric scattering
		'const float e = 2.71828182845904523536028747135266249775724709369995957;',
		'const float pi = 3.141592653589793238462643383279502884197169;',

		// wavelength of used primaries, according to preetham
		'const vec3 lambda = vec3( 680E-9, 550E-9, 450E-9 );',
		// this pre-calcuation replaces older TotalRayleigh(vec3 lambda) function:
		// (8.0 * pow(pi, 3.0) * pow(pow(n, 2.0) - 1.0, 2.0) * (6.0 + 3.0 * pn)) / (3.0 * N * pow(lambda, vec3(4.0)) * (6.0 - 7.0 * pn))
		'const vec3 totalRayleigh = vec3( 5.804542996261093E-6, 1.3562911419845635E-5, 3.0265902468824876E-5 );',

		// mie stuff
		// K coefficient for the primaries
		'const float v = 4.0;',
		'const vec3 K = vec3( 0.686, 0.678, 0.666 );',
		// MieConst = pi * pow( ( 2.0 * pi ) / lambda, vec3( v - 2.0 ) ) * K
		'const vec3 MieConst = vec3( 1.8399918514433978E14, 2.7798023919660528E14, 4.0790479543861094E14 );',

		// earth shadow hack
		// cutoffAngle = pi / 1.95;
		'const float cutoffAngle = 1.6110731556870734;',
		'const float steepness = 1.5;',
		'const float EE = 1000.0;',

		'float sunIntensity( float zenithAngleCos ) {',
		'	zenithAngleCos = clamp( zenithAngleCos, -1.0, 1.0 );',
		'	return EE * max( 0.0, 1.0 - pow( e, -( ( cutoffAngle - acos( zenithAngleCos ) ) / steepness ) ) );',
		'}',

		'vec3 totalMie( float T ) {',
		'	float c = ( 0.2 * T ) * 10E-18;',
		'	return 0.434 * c * MieConst;',
		'}',

		'void main() {',

		'	vec4 worldPosition = modelMatrix * vec4( position, 1.0 );',
		'	vWorldPosition = worldPosition.xyz;',

		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
		'	gl_Position.z = gl_Position.w;', // set z to camera.far

		'	vSunDirection = normalize( sunPosition );',

		'	vSunE = sunIntensity( dot( vSunDirection, up ) );',

		'	vSunfade = 1.0 - clamp( 1.0 - exp( ( sunPosition.y / 450000.0 ) ), 0.0, 1.0 );',

		'	float rayleighCoefficient = rayleigh - ( 1.0 * ( 1.0 - vSunfade ) );',

		// extinction (absorbtion + out scattering)
		// rayleigh coefficients
		'	vBetaR = totalRayleigh * rayleighCoefficient;',

		// mie coefficients
		'	vBetaM = totalMie( turbidity ) * mieCoefficient;',

		'}'
	].join( '\n' ),

	fragmentShader: [
		'varying vec3 vWorldPosition;',
		'varying vec3 vSunDirection;',
		'varying float vSunfade;',
		'varying vec3 vBetaR;',
		'varying vec3 vBetaM;',
		'varying float vSunE;',

		'uniform float luminance;',
		'uniform float mieDirectionalG;',

		'const vec3 cameraPos = vec3( 0.0, 0.0, 0.0 );',

		// constants for atmospheric scattering
		'const float pi = 3.141592653589793238462643383279502884197169;',

		'const float n = 1.0003;', // refractive index of air
		'const float N = 2.545E25;', // number of molecules per unit volume for air at
									// 288.15K and 1013mb (sea level -45 celsius)

		// optical length at zenith for molecules
		'const float rayleighZenithLength = 8.4E3;',
		'const float mieZenithLength = 1.25E3;',
		'const vec3 up = vec3( 0.0, 1.0, 0.0 );',
		// 66 arc seconds -> degrees, and the cosine of that
		'const float sunAngularDiameterCos = 0.999956676946448443553574619906976478926848692873900859324;',

		// 3.0 / ( 16.0 * pi )
		'const float THREE_OVER_SIXTEENPI = 0.05968310365946075;',
		// 1.0 / ( 4.0 * pi )
		'const float ONE_OVER_FOURPI = 0.07957747154594767;',

		'float rayleighPhase( float cosTheta ) {',
		'	return THREE_OVER_SIXTEENPI * ( 1.0 + pow( cosTheta, 2.0 ) );',
		'}',

		'float hgPhase( float cosTheta, float g ) {',
		'	float g2 = pow( g, 2.0 );',
		'	float inverse = 1.0 / pow( 1.0 - 2.0 * g * cosTheta + g2, 1.5 );',
		'	return ONE_OVER_FOURPI * ( ( 1.0 - g2 ) * inverse );',
		'}',

		// Filmic ToneMapping http://filmicgames.com/archives/75
		'const float A = 0.15;',
		'const float B = 0.50;',
		'const float C = 0.10;',
		'const float D = 0.20;',
		'const float E = 0.02;',
		'const float F = 0.30;',

		'const float whiteScale = 1.0748724675633854;', // 1.0 / Uncharted2Tonemap(1000.0)

		'vec3 Uncharted2Tonemap( vec3 x ) {',
		'	return ( ( x * ( A * x + C * B ) + D * E ) / ( x * ( A * x + B ) + D * F ) ) - E / F;',
		'}',


		'void main() {',
		// optical length
		// cutoff angle at 90 to avoid singularity in next formula.
		'	float zenithAngle = acos( max( 0.0, dot( up, normalize( vWorldPosition - cameraPos ) ) ) );',
		'	float inverse = 1.0 / ( cos( zenithAngle ) + 0.15 * pow( 93.885 - ( ( zenithAngle * 180.0 ) / pi ), -1.253 ) );',
		'	float sR = rayleighZenithLength * inverse;',
		'	float sM = mieZenithLength * inverse;',

		// combined extinction factor
		'	vec3 Fex = exp( -( vBetaR * sR + vBetaM * sM ) );',

		// in scattering
		'	float cosTheta = dot( normalize( vWorldPosition - cameraPos ), vSunDirection );',

		'	float rPhase = rayleighPhase( cosTheta * 0.5 + 0.5 );',
		'	vec3 betaRTheta = vBetaR * rPhase;',

		'	float mPhase = hgPhase( cosTheta, mieDirectionalG );',
		'	vec3 betaMTheta = vBetaM * mPhase;',

		'	vec3 Lin = pow( vSunE * ( ( betaRTheta + betaMTheta ) / ( vBetaR + vBetaM ) ) * ( 1.0 - Fex ), vec3( 1.5 ) );',
		'	Lin *= mix( vec3( 1.0 ), pow( vSunE * ( ( betaRTheta + betaMTheta ) / ( vBetaR + vBetaM ) ) * Fex, vec3( 1.0 / 2.0 ) ), clamp( pow( 1.0 - dot( up, vSunDirection ), 5.0 ), 0.0, 1.0 ) );',

		// nightsky
		'	vec3 direction = normalize( vWorldPosition - cameraPos );',
		'	float theta = acos( direction.y ); // elevation --> y-axis, [-pi/2, pi/2]',
		'	float phi = atan( direction.z, direction.x ); // azimuth --> x-axis [-pi/2, pi/2]',
		'	vec2 uv = vec2( phi, theta ) / vec2( 2.0 * pi, pi ) + vec2( 0.5, 0.0 );',
		'	vec3 L0 = vec3( 0.1 ) * Fex;',

		// composition + solar disc
		'	float sundisk = smoothstep( sunAngularDiameterCos, sunAngularDiameterCos + 0.00002, cosTheta );',
		'	L0 += ( vSunE * 19000.0 * Fex ) * sundisk;',

		'	vec3 texColor = ( Lin + L0 ) * 0.04 + vec3( 0.0, 0.0003, 0.00075 );',

		'	vec3 curr = Uncharted2Tonemap( ( log2( 2.0 / pow( luminance, 4.0 ) ) ) * texColor );',
		'	vec3 color = curr * whiteScale;',

		'	vec3 retColor = pow( color, vec3( 1.0 / ( 1.2 + ( 1.2 * vSunfade ) ) ) );',

		'	gl_FragColor = vec4( retColor, 1.0 );',

		'}'
	].join( '\n' )

};