'use strict';

const colors = { enabled: true, visible: true, styles: {}, keys: {} };

if ('FORCE_COLOR' in process.env) {
  colors.enabled = process.env.FORCE_COLOR !== '0';
}

const ansi = style => {
  style.open = `\u001b[${style.codes[0]}m`;
  style.close = `\u001b[${style.codes[1]}m`;
  style.regex = new RegExp(`\\u001b\\[${style.codes[1]}m`, 'g');
  return style;
};

const wrap = (style, str, nl) => {
  let { open, close, regex } = style;
  str = open + (str.includes(close) ? str.replace(regex, close + open) : str) + close;
  // see https://github.com/chalk/chalk/pull/92, thanks to the
  // chalk contributors for this fix. However, we've confirmed that
  // this issue is also present in Windows terminals
  return nl ? str.replace(/\r?\n/g, `${close}$&${open}`) : str;
};

const style = (input, stack) => {
  if (input === '' || input == null) return '';
  if (colors.enabled === false) return input;
  if (colors.visible === false) return '';
  let str = '' + input;
  let nl = str.includes('\n');
  let n = stack.length;
  while (n-- > 0) str = wrap(colors.styles[stack[n]], str, nl);
  return str;
};

const define = (name, codes, type) => {
  colors.styles[name] = ansi({ name, codes });
  let t = colors.keys[type] || (colors.keys[type] = []);
  t.push(name);

  Reflect.defineProperty(colors, name, {
    get() {
      let color = input => style(input, color.stack);
      Reflect.setPrototypeOf(color, colors);
      color.stack = this.stack ? this.stack.concat(name) : [name];
      return color;
    }
  });
};

define('reset', [0, 0], 'modifier');
define('bold', [1, 22], 'modifier');
define('dim', [2, 22], 'modifier');
define('italic', [3, 23], 'modifier');
define('underline', [4, 24], 'modifier');
define('inverse', [7, 27], 'modifier');
define('hidden', [8, 28], 'modifier');
define('strikethrough', [9, 29], 'modifier');

define('black', [30, 39], 'color');
define('red', [31, 39], 'color');
define('green', [32, 39], 'color');
define('yellow', [33, 39], 'color');
define('blue', [34, 39], 'color');
define('magenta', [35, 39], 'color');
define('cyan', [36, 39], 'color');
define('white', [37, 39], 'color');
define('gray', [90, 39], 'color');
define('grey', [90, 39], 'color');

define('bgBlack', [40, 49], 'bg');
define('bgRed', [41, 49], 'bg');
define('bgGreen', [42, 49], 'bg');
define('bgYellow', [43, 49], 'bg');
define('bgBlue', [44, 49], 'bg');
define('bgMagenta', [45, 49], 'bg');
define('bgCyan', [46, 49], 'bg');
define('bgWhite', [47, 49], 'bg');

define('blackBright', [90, 39], 'bright');
define('redBright', [91, 39], 'bright');
define('greenBright', [92, 39], 'bright');
define('yellowBright', [93, 39], 'bright');
define('blueBright', [94, 39], 'bright');
define('magentaBright', [95, 39], 'bright');
define('cyanBright', [96, 39], 'bright');
define('whiteBright', [97, 39], 'bright');

define('bgBlackBright', [100, 49], 'bgBright');
define('bgRedBright', [101, 49], 'bgBright');
define('bgGreenBright', [102, 49], 'bgBright');
define('bgYellowBright', [103, 49], 'bgBright');
define('bgBlueBright', [104, 49], 'bgBright');
define('bgMagentaBright', [105, 49], 'bgBright');
define('bgCyanBright', [106, 49], 'bgBright');
define('bgWhiteBright', [107, 49], 'bgBright');

/* eslint-disable no-control-regex */
const re = colors.ansiRegex = /\u001b\[\d+m/gm;
colors.hasColor = colors.hasAnsi = str => {
  re.lastIndex = 0;
  return !!str && typeof str === 'string' && re.test(str);
};

colors.unstyle = str => {
  re.lastIndex = 0;
  return typeof str === 'string' ? str.replace(re, '') : str;
};

colors.none = colors.clear = colors.noop = str => str; // no-op, for programmatic usage
colors.stripColor = colors.unstyle;
colors.symbols = require('./symbols');
colors.define = define;
module.exports = colors;
