/* eslint-env node, es6 */
'use strict';

var fs = require('fs');

var testFile = './tests/minifier.js';

var regWs = '\\s*';
var regVar = '[_A-Za-z][_A-Za-z0-9\\[\\]]*';
var regStr = '\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';
var regFuncCall = `${regVar}\\(.*\\)`;
var regObjVal = `(?:\\{[^;]*\\}|${regVar})`;
var regStrVal = `(?:(?:(?:${regStr}|${regVar})+(?:${regWs}\\+${regWs})?)+|${regFuncCall})`;

var test_minify_reg = new RegExp(
  `assert${regWs}\\.${regWs}equal${regWs}\\(${regWs}` +
  `minify${regWs}\\(${regWs}(${regStrVal})${regWs}(?:,${regWs}(${regObjVal})${regWs})?\\)${regWs}` +
  `,${regWs}(${regStrVal})${regWs}(?:,${regWs}(${regStrVal})${regWs})?\\)${regWs};`,
  'g');

var test_minify_error_reg = new RegExp(
  `assert${regWs}\\.${regWs}throws${regWs}\\(${regWs}` +
  `function${regWs}\\(${regWs}\\)${regWs}\\{${regWs}` +
  `minify${regWs}\\(${regWs}(${regStrVal})${regWs}(?:,${regWs}(${regObjVal})${regWs})?\\);${regWs}` +
  `\\}${regWs},${regWs}(${regStrVal})\\);`,
  'g');

fs.readFile(testFile, { encoding: 'utf8' }, function(error, data) {
  if (error) {
    throw error;
  }

  data = data.replace(test_minify_reg, function(match, input, options, output, description) {
    var hasOptions = typeof options !== 'undefined';
    var hasDescription = typeof description !== 'undefined';

    var str = 'test_minify(assert, ' + input + ', ' + output;
    if (hasOptions) {
      str += ', ' + options;
    }
    else if (hasDescription) {
      str += ', null';
    }

    if (hasDescription) {
      str += ', ' + description;
    }
    str += ');';

    return str;
  });

  data = data.replace(test_minify_error_reg, function(match, input, options, description) {
    var hasOptions = typeof options !== 'undefined';
    var hasDescription = typeof description !== 'undefined';

    var str = 'test_minify_error(assert, ' + input;
    if (hasOptions) {
      str += ', ' + options;
    }
    else if (hasDescription) {
      str += ', null';
    }

    str += ', null';

    if (hasDescription) {
      str += ', ' + description;
    }
    str += ');';

    return str;
  });

  fs.writeFile(testFile, data, function(error) {
    if (error) {
      throw error;
    }
  });
});