import {
  getSymbolVertexShader,
  formatNumber,
  getSymbolFragmentShader,
  formatColor, formatArray, parse, parseSymbolStyle
} from '../../../../src/ol/webgl/ShaderBuilder.js';

describe('ol.webgl.ShaderBuilder', function() {

  describe('formatNumber', function() {
    it('does a simple transform when a fraction is present', function() {
      expect(formatNumber(1.3456)).to.eql('1.3456');
    });
    it('adds a fraction separator when missing', function() {
      expect(formatNumber(1)).to.eql('1.0');
      expect(formatNumber(2.0)).to.eql('2.0');
    });
  });

  describe('formatArray', function() {
    it('outputs numbers with dot separators', function() {
      expect(formatArray([1, 0, 3.45, 0.8888])).to.eql('1.0, 0.0, 3.45, 0.8888');
    });
  });

  describe('formatColor', function() {
    it('normalizes color and outputs numbers with dot separators', function() {
      expect(formatColor([100, 0, 255, 1])).to.eql('0.39215686274509803, 0.0, 1.0, 1.0');
    });
  });

  describe('getSymbolVertexShader', function() {
    it('generates a symbol vertex shader (with varying)', function() {
      const parameters = {
        varyings: [{
          name: 'v_opacity',
          type: 'float',
          expression: formatNumber(0.4)
        }, {
          name: 'v_test',
          type: 'vec3',
          expression: 'vec3(' + formatArray([1, 2, 3]) + ')'
        }],
        sizeExpression: 'vec2(' + formatNumber(6) + ')',
        offsetExpression: 'vec2(' + formatArray([5, -7]) + ')',
        colorExpression: 'vec4(' + formatColor([80, 0, 255, 1]) + ')',
        texCoordExpression: 'vec4(' + formatArray([0, 0.5, 0.5, 1]) + ')',
        rotateWithView: false
      };

      expect(getSymbolVertexShader(parameters)).to.eql(`precision mediump float;
uniform mat4 u_projectionMatrix;
uniform mat4 u_offsetScaleMatrix;
uniform mat4 u_offsetRotateMatrix;

attribute vec2 a_position;
attribute float a_index;

varying vec2 v_texCoord;
varying vec2 v_quadCoord;
varying float v_opacity;
varying vec3 v_test;
void main(void) {
  mat4 offsetMatrix = u_offsetScaleMatrix;
  vec2 size = vec2(6.0);
  vec2 offset = vec2(5.0, -7.0);
  float offsetX = a_index == 0.0 || a_index == 3.0 ? offset.x - size.x / 2.0 : offset.x + size.x / 2.0;
  float offsetY = a_index == 0.0 || a_index == 1.0 ? offset.y - size.y / 2.0 : offset.y + size.y / 2.0;
  vec4 offsets = offsetMatrix * vec4(offsetX, offsetY, 0.0, 0.0);
  gl_Position = u_projectionMatrix * vec4(a_position, 0.0, 1.0) + offsets;
  vec4 texCoord = vec4(0.0, 0.5, 0.5, 1.0);
  float u = a_index == 0.0 || a_index == 3.0 ? texCoord.s : texCoord.q;
  float v = a_index == 2.0 || a_index == 3.0 ? texCoord.t : texCoord.p;
  v_texCoord = vec2(u, v);
  u = a_index == 0.0 || a_index == 3.0 ? 0.0 : 1.0;
  v = a_index == 2.0 || a_index == 3.0 ? 0.0 : 1.0;
  v_quadCoord = vec2(u, v);
  v_opacity = 0.4;
  v_test = vec3(1.0, 2.0, 3.0);
}`);
    });
    it('generates a symbol vertex shader (with uniforms and attributes)', function() {
      const parameters = {
        uniforms: ['float u_myUniform'],
        attributes: ['vec2 a_myAttr'],
        sizeExpression: 'vec2(' + formatNumber(6) + ')',
        offsetExpression: 'vec2(' + formatArray([5, -7]) + ')',
        colorExpression: 'vec4(' + formatColor([80, 0, 255, 1]) + ')',
        texCoordExpression: 'vec4(' + formatArray([0, 0.5, 0.5, 1]) + ')'
      };

      expect(getSymbolVertexShader(parameters)).to.eql(`precision mediump float;
uniform mat4 u_projectionMatrix;
uniform mat4 u_offsetScaleMatrix;
uniform mat4 u_offsetRotateMatrix;
uniform float u_myUniform;
attribute vec2 a_position;
attribute float a_index;
attribute vec2 a_myAttr;
varying vec2 v_texCoord;
varying vec2 v_quadCoord;

void main(void) {
  mat4 offsetMatrix = u_offsetScaleMatrix;
  vec2 size = vec2(6.0);
  vec2 offset = vec2(5.0, -7.0);
  float offsetX = a_index == 0.0 || a_index == 3.0 ? offset.x - size.x / 2.0 : offset.x + size.x / 2.0;
  float offsetY = a_index == 0.0 || a_index == 1.0 ? offset.y - size.y / 2.0 : offset.y + size.y / 2.0;
  vec4 offsets = offsetMatrix * vec4(offsetX, offsetY, 0.0, 0.0);
  gl_Position = u_projectionMatrix * vec4(a_position, 0.0, 1.0) + offsets;
  vec4 texCoord = vec4(0.0, 0.5, 0.5, 1.0);
  float u = a_index == 0.0 || a_index == 3.0 ? texCoord.s : texCoord.q;
  float v = a_index == 2.0 || a_index == 3.0 ? texCoord.t : texCoord.p;
  v_texCoord = vec2(u, v);
  u = a_index == 0.0 || a_index == 3.0 ? 0.0 : 1.0;
  v = a_index == 2.0 || a_index == 3.0 ? 0.0 : 1.0;
  v_quadCoord = vec2(u, v);

}`);
    });
    it('generates a symbol vertex shader (with rotateWithView)', function() {
      const parameters = {
        sizeExpression: 'vec2(' + formatNumber(6) + ')',
        offsetExpression: 'vec2(' + formatArray([5, -7]) + ')',
        colorExpression: 'vec4(' + formatColor([80, 0, 255, 1]) + ')',
        texCoordExpression: 'vec4(' + formatArray([0, 0.5, 0.5, 1]) + ')',
        rotateWithView: true
      };

      expect(getSymbolVertexShader(parameters)).to.eql(`precision mediump float;
uniform mat4 u_projectionMatrix;
uniform mat4 u_offsetScaleMatrix;
uniform mat4 u_offsetRotateMatrix;

attribute vec2 a_position;
attribute float a_index;

varying vec2 v_texCoord;
varying vec2 v_quadCoord;

void main(void) {
  mat4 offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;
  vec2 size = vec2(6.0);
  vec2 offset = vec2(5.0, -7.0);
  float offsetX = a_index == 0.0 || a_index == 3.0 ? offset.x - size.x / 2.0 : offset.x + size.x / 2.0;
  float offsetY = a_index == 0.0 || a_index == 1.0 ? offset.y - size.y / 2.0 : offset.y + size.y / 2.0;
  vec4 offsets = offsetMatrix * vec4(offsetX, offsetY, 0.0, 0.0);
  gl_Position = u_projectionMatrix * vec4(a_position, 0.0, 1.0) + offsets;
  vec4 texCoord = vec4(0.0, 0.5, 0.5, 1.0);
  float u = a_index == 0.0 || a_index == 3.0 ? texCoord.s : texCoord.q;
  float v = a_index == 2.0 || a_index == 3.0 ? texCoord.t : texCoord.p;
  v_texCoord = vec2(u, v);
  u = a_index == 0.0 || a_index == 3.0 ? 0.0 : 1.0;
  v = a_index == 2.0 || a_index == 3.0 ? 0.0 : 1.0;
  v_quadCoord = vec2(u, v);

}`);
    });
  });

  describe('getSymbolFragmentShader', function() {
    it('generates a symbol fragment shader (with varying)', function() {
      const parameters = {
        varyings: [{
          name: 'v_opacity',
          type: 'float',
          expression: formatNumber(0.4)
        }, {
          name: 'v_test',
          type: 'vec3',
          expression: 'vec3(' + formatArray([1, 2, 3]) + ')'
        }],
        sizeExpression: 'vec2(' + formatNumber(6) + ')',
        offsetExpression: 'vec2(' + formatArray([5, -7]) + ')',
        colorExpression: 'vec4(' + formatColor([80, 0, 255]) + ', v_opacity)',
        texCoordExpression: 'vec4(' + formatArray([0, 0.5, 0.5, 1]) + ')',
        rotateWithView: false
      };

      expect(getSymbolFragmentShader(parameters)).to.eql(`precision mediump float;

varying vec2 v_texCoord;
varying vec2 v_quadCoord;
varying float v_opacity;
varying vec3 v_test;
void main(void) {
  gl_FragColor = vec4(0.3137254901960784, 0.0, 1.0, v_opacity);
  gl_FragColor.rgb *= gl_FragColor.a;
}`);
    });
    it('generates a symbol fragment shader (with uniforms)', function() {
      const parameters = {
        uniforms: ['float u_myUniform', 'vec2 u_myUniform2'],
        sizeExpression: 'vec2(' + formatNumber(6) + ')',
        offsetExpression: 'vec2(' + formatArray([5, -7]) + ')',
        colorExpression: 'vec4(' + formatColor([255, 255, 255, 1]) + ')',
        texCoordExpression: 'vec4(' + formatArray([0, 0.5, 0.5, 1]) + ')'
      };

      expect(getSymbolFragmentShader(parameters)).to.eql(`precision mediump float;
uniform float u_myUniform;
uniform vec2 u_myUniform2;
varying vec2 v_texCoord;
varying vec2 v_quadCoord;

void main(void) {
  gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
  gl_FragColor.rgb *= gl_FragColor.a;
}`);
    });
  });

  describe('parse', function() {
    let attributes, prefix, parseFn;

    beforeEach(function() {
      attributes = [];
      prefix = 'a_';
      parseFn = function(value) {
        return parse(value, attributes, prefix);
      };
    });

    it('parses expressions & literal values', function() {
      expect(parseFn(1)).to.eql('1.0');
      expect(parseFn(['get', 'myAttr'])).to.eql('a_myAttr');
      expect(parseFn(['+', ['*', ['get', 'size'], 0.001], 12])).to.eql('((a_size * 0.001) + 12.0)');
      expect(parseFn(['clamp', ['get', 'attr2'], ['get', 'attr3'], 20])).to.eql('clamp(a_attr2, a_attr3, 20.0)');
      expect(parseFn(['stretch', ['get', 'size'], 10, 100, 4, 8])).to.eql('(clamp(a_size, 10.0, 100.0) * ((8.0 - 4.0) / (100.0 - 10.0)) + 4.0)');
      expect(attributes).to.eql(['myAttr', 'size', 'attr2', 'attr3']);
    });

    it('does not register an attribute several times', function() {
      parseFn(['get', 'myAttr']);
      parseFn(['clamp', ['get', 'attr2'], ['get', 'attr2'], ['get', 'myAttr']]);
      expect(attributes).to.eql(['myAttr', 'attr2']);
    });
  });

  describe('parseSymbolStyle', function() {
    it('parses a style without expressions', function() {
      const result = parseSymbolStyle({
        symbolType: 'square',
        size: [4, 8],
        color: '#336699',
        rotateWithView: true
      });
      expect(result.params).to.eql({
        uniforms: [],
        attributes: [],
        varyings: [],
        colorExpression: 'vec4(0.2, 0.4, 0.6, 1.0) * vec4(1.0, 1.0, 1.0, 1.0 * 1.0)',
        sizeExpression: 'vec2(4.0, 8.0)',
        offsetExpression: 'vec2(0.0, 0.0)',
        texCoordExpression: 'vec4(0.0, 0.0, 1.0, 1.0)',
        rotateWithView: true
      });
      expect(result.attributes).to.eql([]);
      expect(result.uniforms).to.eql({});
    });

    it('parses a style with expressions', function() {
      const result = parseSymbolStyle({
        symbolType: 'square',
        size: ['get', 'attr1'],
        color: [
          1.0, 0.0, 0.5, ['get', 'attr2']
        ],
        textureCoord: [0.5, 0.5, 0.5, 1],
        offset: [3, ['get', 'attr3']]
      });
      expect(result.params).to.eql({
        uniforms: [],
        attributes: ['float a_attr1', 'float a_attr3', 'float a_attr2'],
        varyings: [{
          name: 'v_attr1',
          type: 'float',
          expression: 'a_attr1'
        }, {
          name: 'v_attr2',
          type: 'float',
          expression: 'a_attr2'
        }],
        colorExpression: 'vec4(1.0, 0.0, 0.5, v_attr2) * vec4(1.0, 1.0, 1.0, 1.0 * 1.0)',
        sizeExpression: 'vec2(a_attr1, a_attr1)',
        offsetExpression: 'vec2(3.0, a_attr3)',
        texCoordExpression: 'vec4(0.5, 0.5, 0.5, 1.0)',
        rotateWithView: false
      });
      expect(result.attributes.length).to.eql(3);
      expect(result.attributes[0].name).to.eql('attr1');
      expect(result.attributes[1].name).to.eql('attr3');
      expect(result.attributes[2].name).to.eql('attr2');
      expect(result.uniforms).to.eql({});
    });

    it('parses a style with a uniform (texture)', function() {
      const result = parseSymbolStyle({
        symbolType: 'image',
        src: '../data/image.png',
        size: 6,
        color: '#336699',
        opacity: 0.5
      });
      expect(result.params).to.eql({
        uniforms: ['sampler2D u_texture'],
        attributes: [],
        varyings: [],
        colorExpression: 'vec4(0.2, 0.4, 0.6, 1.0) * vec4(1.0, 1.0, 1.0, 0.5 * 1.0) * texture2D(u_texture, v_texCoord)',
        sizeExpression: 'vec2(6.0, 6.0)',
        offsetExpression: 'vec2(0.0, 0.0)',
        texCoordExpression: 'vec4(0.0, 0.0, 1.0, 1.0)',
        rotateWithView: false
      });
      expect(result.attributes).to.eql([]);
      expect(result.uniforms).to.have.property('u_texture');
    });
  });

});