import clamp from '../../../utils/esm/clamp/clamp.mjs';

/**
 * Returns a number whose value is limited to the given range.
 * @param {number} value The value to be clamped
 * @param {number} min The lower boundary of the output range
 * @param {number} max The upper boundary of the output range
 * @returns {number} A number in the range [min, max]
 */
function clampWrapper(value, min = 0, max = 1) {
  {
    if (value < min || value > max) {
      console.error(`MUI: The value provided ${value} is out of range [${min}, ${max}].`);
    }
  }
  return clamp(value, min, max);
}

/**
 * Converts a color from CSS hex format to CSS rgb format.
 * @param {string} color - Hex color, i.e. #nnn or #nnnnnn
 * @returns {string} A CSS rgb color string
 */
function hexToRgb(color) {
  color = color.slice(1);
  const re = new RegExp(`.{1,${color.length >= 6 ? 2 : 1}}`, 'g');
  let colors = color.match(re);
  if (colors && colors[0].length === 1) {
    colors = colors.map(n => n + n);
  }
  {
    if (color.length !== color.trim().length) {
      console.error(`MUI: The color: "${color}" is invalid. Make sure the color input doesn't contain leading/trailing space.`);
    }
  }
  return colors ? `rgb${colors.length === 4 ? 'a' : ''}(${colors.map((n, index) => {
    return index < 3 ? parseInt(n, 16) : Math.round(parseInt(n, 16) / 255 * 1000) / 1000;
  }).join(', ')})` : '';
}

/**
 * Returns an object with the type and values of a color.
 *
 * Note: Does not support rgb % values.
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @returns {object} - A MUI color object: {type: string, values: number[]}
 */
function decomposeColor(color) {
  // Idempotent
  if (color.type) {
    return color;
  }
  if (color.charAt(0) === '#') {
    return decomposeColor(hexToRgb(color));
  }
  const marker = color.indexOf('(');
  const type = color.substring(0, marker);
  if (!['rgb', 'rgba', 'hsl', 'hsla', 'color'].includes(type)) {
    throw new Error(`MUI: Unsupported \`${color}\` color.\n` + 'The following formats are supported: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color().' );
  }
  let values = color.substring(marker + 1, color.length - 1);
  let colorSpace;
  if (type === 'color') {
    values = values.split(' ');
    colorSpace = values.shift();
    if (values.length === 4 && values[3].charAt(0) === '/') {
      values[3] = values[3].slice(1);
    }
    if (!['srgb', 'display-p3', 'a98-rgb', 'prophoto-rgb', 'rec-2020'].includes(colorSpace)) {
      throw new Error(`MUI: unsupported \`${colorSpace}\` color space.\n` + 'The following color spaces are supported: srgb, display-p3, a98-rgb, prophoto-rgb, rec-2020.' );
    }
  } else {
    values = values.split(',');
  }
  values = values.map(value => parseFloat(value));
  return {
    type,
    values,
    colorSpace
  };
}

/**
 * Returns a channel created from the input color.
 *
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @returns {string} - The channel for the color, that can be used in rgba or hsla colors
 */
const colorChannel = color => {
  const decomposedColor = decomposeColor(color);
  return decomposedColor.values.slice(0, 3).map((val, idx) => decomposedColor.type.includes('hsl') && idx !== 0 ? `${val}%` : val).join(' ');
};
const private_safeColorChannel = (color, warning) => {
  try {
    return colorChannel(color);
  } catch (error) {
    if (warning && "development" !== 'production') {
      console.warn(warning);
    }
    return color;
  }
};

/**
 * Converts a color object with type and values to a string.
 * @param {object} color - Decomposed color
 * @param {string} color.type - One of: 'rgb', 'rgba', 'hsl', 'hsla', 'color'
 * @param {array} color.values - [n,n,n] or [n,n,n,n]
 * @returns {string} A CSS color string
 */
function recomposeColor(color) {
  const {
    type,
    colorSpace
  } = color;
  let {
    values
  } = color;
  if (type.includes('rgb')) {
    // Only convert the first 3 values to int (i.e. not alpha)
    values = values.map((n, i) => i < 3 ? parseInt(n, 10) : n);
  } else if (type.includes('hsl')) {
    values[1] = `${values[1]}%`;
    values[2] = `${values[2]}%`;
  }
  if (type.includes('color')) {
    values = `${colorSpace} ${values.join(' ')}`;
  } else {
    values = `${values.join(', ')}`;
  }
  return `${type}(${values})`;
}

/**
 * Converts a color from hsl format to rgb format.
 * @param {string} color - HSL color values
 * @returns {string} rgb color values
 */
function hslToRgb(color) {
  color = decomposeColor(color);
  const {
    values
  } = color;
  const h = values[0];
  const s = values[1] / 100;
  const l = values[2] / 100;
  const a = s * Math.min(l, 1 - l);
  const f = (n, k = (n + h / 30) % 12) => l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
  let type = 'rgb';
  const rgb = [Math.round(f(0) * 255), Math.round(f(8) * 255), Math.round(f(4) * 255)];
  if (color.type === 'hsla') {
    type += 'a';
    rgb.push(values[3]);
  }
  return recomposeColor({
    type,
    values: rgb
  });
}
/**
 * The relative brightness of any point in a color space,
 * normalized to 0 for darkest black and 1 for lightest white.
 *
 * Formula: https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @returns {number} The relative brightness of the color in the range 0 - 1
 */
function getLuminance(color) {
  color = decomposeColor(color);
  let rgb = color.type === 'hsl' || color.type === 'hsla' ? decomposeColor(hslToRgb(color)).values : color.values;
  rgb = rgb.map(val => {
    if (color.type !== 'color') {
      val /= 255; // normalized
    }
    return val <= 0.03928 ? val / 12.92 : ((val + 0.055) / 1.055) ** 2.4;
  });

  // Truncate at 3 digits
  return Number((0.2126 * rgb[0] + 0.7152 * rgb[1] + 0.0722 * rgb[2]).toFixed(3));
}

/**
 * Calculates the contrast ratio between two colors.
 *
 * Formula: https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 * @param {string} foreground - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla()
 * @param {string} background - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla()
 * @returns {number} A contrast ratio value in the range 0 - 21.
 */
function getContrastRatio(foreground, background) {
  const lumA = getLuminance(foreground);
  const lumB = getLuminance(background);
  return (Math.max(lumA, lumB) + 0.05) / (Math.min(lumA, lumB) + 0.05);
}

/**
 * Sets the absolute transparency of a color.
 * Any existing alpha values are overwritten.
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @param {number} value - value to set the alpha channel to in the range 0 - 1
 * @returns {string} A CSS color string. Hex input values are returned as rgb
 */
function alpha(color, value) {
  color = decomposeColor(color);
  value = clampWrapper(value);
  if (color.type === 'rgb' || color.type === 'hsl') {
    color.type += 'a';
  }
  if (color.type === 'color') {
    color.values[3] = `/${value}`;
  } else {
    color.values[3] = value;
  }
  return recomposeColor(color);
}
function private_safeAlpha(color, value, warning) {
  try {
    return alpha(color, value);
  } catch (error) {
    return color;
  }
}

/**
 * Darkens a color.
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @param {number} coefficient - multiplier in the range 0 - 1
 * @returns {string} A CSS color string. Hex input values are returned as rgb
 */
function darken(color, coefficient) {
  color = decomposeColor(color);
  coefficient = clampWrapper(coefficient);
  if (color.type.includes('hsl')) {
    color.values[2] *= 1 - coefficient;
  } else if (color.type.includes('rgb') || color.type.includes('color')) {
    for (let i = 0; i < 3; i += 1) {
      color.values[i] *= 1 - coefficient;
    }
  }
  return recomposeColor(color);
}
function private_safeDarken(color, coefficient, warning) {
  try {
    return darken(color, coefficient);
  } catch (error) {
    return color;
  }
}

/**
 * Lightens a color.
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @param {number} coefficient - multiplier in the range 0 - 1
 * @returns {string} A CSS color string. Hex input values are returned as rgb
 */
function lighten(color, coefficient) {
  color = decomposeColor(color);
  coefficient = clampWrapper(coefficient);
  if (color.type.includes('hsl')) {
    color.values[2] += (100 - color.values[2]) * coefficient;
  } else if (color.type.includes('rgb')) {
    for (let i = 0; i < 3; i += 1) {
      color.values[i] += (255 - color.values[i]) * coefficient;
    }
  } else if (color.type.includes('color')) {
    for (let i = 0; i < 3; i += 1) {
      color.values[i] += (1 - color.values[i]) * coefficient;
    }
  }
  return recomposeColor(color);
}
function private_safeLighten(color, coefficient, warning) {
  try {
    return lighten(color, coefficient);
  } catch (error) {
    return color;
  }
}

/**
 * Darken or lighten a color, depending on its luminance.
 * Light colors are darkened, dark colors are lightened.
 * @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
 * @param {number} coefficient=0.15 - multiplier in the range 0 - 1
 * @returns {string} A CSS color string. Hex input values are returned as rgb
 */
function emphasize(color, coefficient = 0.15) {
  return getLuminance(color) > 0.5 ? darken(color, coefficient) : lighten(color, coefficient);
}
function private_safeEmphasize(color, coefficient, warning) {
  try {
    return emphasize(color, coefficient);
  } catch (error) {
    return color;
  }
}

export { alpha, colorChannel, darken, decomposeColor, emphasize, getContrastRatio, getLuminance, hexToRgb, hslToRgb, lighten, private_safeAlpha, private_safeColorChannel, private_safeDarken, private_safeEmphasize, private_safeLighten, recomposeColor };
//# sourceMappingURL=colorManipulator.mjs.map
