'use strict';

const fragTemplate = [
  "precision mediump float;",
  "void main(void){",
  "float test = 0.1;",
  "%forloop%",
  "gl_FragColor = vec4(0.0);",
  "}"
].join("\n");
function generateIfTestSrc(maxIfs) {
  let src = "";
  for (let i = 0; i < maxIfs; ++i) {
    if (i > 0) {
      src += "\nelse ";
    }
    if (i < maxIfs - 1) {
      src += `if(test == ${i}.0){}`;
    }
  }
  return src;
}
function checkMaxIfStatementsInShader(maxIfs, gl) {
  if (maxIfs === 0) {
    throw new Error("Invalid value of `0` passed to `checkMaxIfStatementsInShader`");
  }
  const shader = gl.createShader(gl.FRAGMENT_SHADER);
  while (true) {
    const fragmentSrc = fragTemplate.replace(/%forloop%/gi, generateIfTestSrc(maxIfs));
    gl.shaderSource(shader, fragmentSrc);
    gl.compileShader(shader);
    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
      maxIfs = maxIfs / 2 | 0;
    } else {
      break;
    }
  }
  return maxIfs;
}

exports.checkMaxIfStatementsInShader = checkMaxIfStatementsInShader;
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