/**
 * WordPress dependencies
 */
import { __, _x } from '@wordpress/i18n';
import { Platform } from '@wordpress/element';

/**
 * Internal dependencies
 */

const isWeb = Platform.OS === 'web';
const allUnits = {
  px: {
    value: 'px',
    label: isWeb ? 'px' : __('Pixels (px)'),
    a11yLabel: __('Pixels (px)'),
    step: 1
  },
  '%': {
    value: '%',
    label: isWeb ? '%' : __('Percentage (%)'),
    a11yLabel: __('Percent (%)'),
    step: 0.1
  },
  em: {
    value: 'em',
    label: isWeb ? 'em' : __('Relative to parent font size (em)'),
    a11yLabel: _x('ems', 'Relative to parent font size (em)'),
    step: 0.01
  },
  rem: {
    value: 'rem',
    label: isWeb ? 'rem' : __('Relative to root font size (rem)'),
    a11yLabel: _x('rems', 'Relative to root font size (rem)'),
    step: 0.01
  },
  vw: {
    value: 'vw',
    label: isWeb ? 'vw' : __('Viewport width (vw)'),
    a11yLabel: __('Viewport width (vw)'),
    step: 0.1
  },
  vh: {
    value: 'vh',
    label: isWeb ? 'vh' : __('Viewport height (vh)'),
    a11yLabel: __('Viewport height (vh)'),
    step: 0.1
  },
  vmin: {
    value: 'vmin',
    label: isWeb ? 'vmin' : __('Viewport smallest dimension (vmin)'),
    a11yLabel: __('Viewport smallest dimension (vmin)'),
    step: 0.1
  },
  vmax: {
    value: 'vmax',
    label: isWeb ? 'vmax' : __('Viewport largest dimension (vmax)'),
    a11yLabel: __('Viewport largest dimension (vmax)'),
    step: 0.1
  },
  ch: {
    value: 'ch',
    label: isWeb ? 'ch' : __('Width of the zero (0) character (ch)'),
    a11yLabel: __('Width of the zero (0) character (ch)'),
    step: 0.01
  },
  ex: {
    value: 'ex',
    label: isWeb ? 'ex' : __('x-height of the font (ex)'),
    a11yLabel: __('x-height of the font (ex)'),
    step: 0.01
  },
  cm: {
    value: 'cm',
    label: isWeb ? 'cm' : __('Centimeters (cm)'),
    a11yLabel: __('Centimeters (cm)'),
    step: 0.001
  },
  mm: {
    value: 'mm',
    label: isWeb ? 'mm' : __('Millimeters (mm)'),
    a11yLabel: __('Millimeters (mm)'),
    step: 0.1
  },
  in: {
    value: 'in',
    label: isWeb ? 'in' : __('Inches (in)'),
    a11yLabel: __('Inches (in)'),
    step: 0.001
  },
  pc: {
    value: 'pc',
    label: isWeb ? 'pc' : __('Picas (pc)'),
    a11yLabel: __('Picas (pc)'),
    step: 1
  },
  pt: {
    value: 'pt',
    label: isWeb ? 'pt' : __('Points (pt)'),
    a11yLabel: __('Points (pt)'),
    step: 1
  },
  svw: {
    value: 'svw',
    label: isWeb ? 'svw' : __('Small viewport width (svw)'),
    a11yLabel: __('Small viewport width (svw)'),
    step: 0.1
  },
  svh: {
    value: 'svh',
    label: isWeb ? 'svh' : __('Small viewport height (svh)'),
    a11yLabel: __('Small viewport height (svh)'),
    step: 0.1
  },
  svi: {
    value: 'svi',
    label: isWeb ? 'svi' : __('Viewport smallest size in the inline direction (svi)'),
    a11yLabel: __('Small viewport width or height (svi)'),
    step: 0.1
  },
  svb: {
    value: 'svb',
    label: isWeb ? 'svb' : __('Viewport smallest size in the block direction (svb)'),
    a11yLabel: __('Small viewport width or height (svb)'),
    step: 0.1
  },
  svmin: {
    value: 'svmin',
    label: isWeb ? 'svmin' : __('Small viewport smallest dimension (svmin)'),
    a11yLabel: __('Small viewport smallest dimension (svmin)'),
    step: 0.1
  },
  lvw: {
    value: 'lvw',
    label: isWeb ? 'lvw' : __('Large viewport width (lvw)'),
    a11yLabel: __('Large viewport width (lvw)'),
    step: 0.1
  },
  lvh: {
    value: 'lvh',
    label: isWeb ? 'lvh' : __('Large viewport height (lvh)'),
    a11yLabel: __('Large viewport height (lvh)'),
    step: 0.1
  },
  lvi: {
    value: 'lvi',
    label: isWeb ? 'lvi' : __('Large viewport width or height (lvi)'),
    a11yLabel: __('Large viewport width or height (lvi)'),
    step: 0.1
  },
  lvb: {
    value: 'lvb',
    label: isWeb ? 'lvb' : __('Large viewport width or height (lvb)'),
    a11yLabel: __('Large viewport width or height (lvb)'),
    step: 0.1
  },
  lvmin: {
    value: 'lvmin',
    label: isWeb ? 'lvmin' : __('Large viewport smallest dimension (lvmin)'),
    a11yLabel: __('Large viewport smallest dimension (lvmin)'),
    step: 0.1
  },
  dvw: {
    value: 'dvw',
    label: isWeb ? 'dvw' : __('Dynamic viewport width (dvw)'),
    a11yLabel: __('Dynamic viewport width (dvw)'),
    step: 0.1
  },
  dvh: {
    value: 'dvh',
    label: isWeb ? 'dvh' : __('Dynamic viewport height (dvh)'),
    a11yLabel: __('Dynamic viewport height (dvh)'),
    step: 0.1
  },
  dvi: {
    value: 'dvi',
    label: isWeb ? 'dvi' : __('Dynamic viewport width or height (dvi)'),
    a11yLabel: __('Dynamic viewport width or height (dvi)'),
    step: 0.1
  },
  dvb: {
    value: 'dvb',
    label: isWeb ? 'dvb' : __('Dynamic viewport width or height (dvb)'),
    a11yLabel: __('Dynamic viewport width or height (dvb)'),
    step: 0.1
  },
  dvmin: {
    value: 'dvmin',
    label: isWeb ? 'dvmin' : __('Dynamic viewport smallest dimension (dvmin)'),
    a11yLabel: __('Dynamic viewport smallest dimension (dvmin)'),
    step: 0.1
  },
  dvmax: {
    value: 'dvmax',
    label: isWeb ? 'dvmax' : __('Dynamic viewport largest dimension (dvmax)'),
    a11yLabel: __('Dynamic viewport largest dimension (dvmax)'),
    step: 0.1
  },
  svmax: {
    value: 'svmax',
    label: isWeb ? 'svmax' : __('Small viewport largest dimension (svmax)'),
    a11yLabel: __('Small viewport largest dimension (svmax)'),
    step: 0.1
  },
  lvmax: {
    value: 'lvmax',
    label: isWeb ? 'lvmax' : __('Large viewport largest dimension (lvmax)'),
    a11yLabel: __('Large viewport largest dimension (lvmax)'),
    step: 0.1
  }
};

/**
 * An array of all available CSS length units.
 */
export const ALL_CSS_UNITS = Object.values(allUnits);

/**
 * Units of measurements. `a11yLabel` is used by screenreaders.
 */
export const CSS_UNITS = [allUnits.px, allUnits['%'], allUnits.em, allUnits.rem, allUnits.vw, allUnits.vh];
export const DEFAULT_UNIT = allUnits.px;

/**
 * Handles legacy value + unit handling.
 * This component use to manage both incoming value and units separately.
 *
 * Moving forward, ideally the value should be a string that contains both
 * the value and unit, example: '10px'
 *
 * @param rawValue     The raw value as a string (may or may not contain the unit)
 * @param fallbackUnit The unit used as a fallback, if not unit is detected in the `value`
 * @param allowedUnits Units to derive from.
 * @return The extracted quantity and unit. The quantity can be `undefined` in case the raw value
 * could not be parsed to a number correctly. The unit can be `undefined` in case the unit parse
 * from the raw value could not be matched against the list of allowed units.
 */
export function getParsedQuantityAndUnit(rawValue, fallbackUnit, allowedUnits) {
  const initialValue = fallbackUnit ? `${rawValue !== null && rawValue !== void 0 ? rawValue : ''}${fallbackUnit}` : rawValue;
  return parseQuantityAndUnitFromRawValue(initialValue, allowedUnits);
}

/**
 * Checks if units are defined.
 *
 * @param units List of units.
 * @return Whether the list actually contains any units.
 */
export function hasUnits(units) {
  // Although the `isArray` check shouldn't be necessary (given the signature of
  // this typed function), it's better to stay on the side of caution, since
  // this function may be called from un-typed environments.
  return Array.isArray(units) && !!units.length;
}

/**
 * Parses a quantity and unit from a raw string value, given a list of allowed
 * units and otherwise falling back to the default unit.
 *
 * @param rawValue     The raw value as a string (may or may not contain the unit)
 * @param allowedUnits Units to derive from.
 * @return The extracted quantity and unit. The quantity can be `undefined` in case the raw value
 * could not be parsed to a number correctly. The unit can be `undefined` in case the unit parsed
 * from the raw value could not be matched against the list of allowed units.
 */
export function parseQuantityAndUnitFromRawValue(rawValue, allowedUnits = ALL_CSS_UNITS) {
  let trimmedValue;
  let quantityToReturn;
  if (typeof rawValue !== 'undefined' || rawValue === null) {
    trimmedValue = `${rawValue}`.trim();
    const parsedQuantity = parseFloat(trimmedValue);
    quantityToReturn = !isFinite(parsedQuantity) ? undefined : parsedQuantity;
  }
  const unitMatch = trimmedValue?.match(/[\d.\-\+]*\s*(.*)/);
  const matchedUnit = unitMatch?.[1]?.toLowerCase();
  let unitToReturn;
  if (hasUnits(allowedUnits)) {
    const match = allowedUnits.find(item => item.value === matchedUnit);
    unitToReturn = match?.value;
  } else {
    unitToReturn = DEFAULT_UNIT.value;
  }
  return [quantityToReturn, unitToReturn];
}

/**
 * Parses quantity and unit from a raw value. Validates parsed value, using fallback
 * value if invalid.
 *
 * @param rawValue         The next value.
 * @param allowedUnits     Units to derive from.
 * @param fallbackQuantity The fallback quantity, used in case it's not possible to parse a valid quantity from the raw value.
 * @param fallbackUnit     The fallback unit, used in case it's not possible to parse a valid unit from the raw value.
 * @return The extracted quantity and unit. The quantity can be `undefined` in case the raw value
 * could not be parsed to a number correctly, and the `fallbackQuantity` was also `undefined`. The
 * unit can be `undefined` only if the unit parsed from the raw value could not be matched against
 * the list of allowed units, the `fallbackQuantity` is also `undefined` and the list of
 * `allowedUnits` is passed empty.
 */
export function getValidParsedQuantityAndUnit(rawValue, allowedUnits, fallbackQuantity, fallbackUnit) {
  const [parsedQuantity, parsedUnit] = parseQuantityAndUnitFromRawValue(rawValue, allowedUnits);

  // The parsed value from `parseQuantityAndUnitFromRawValue` should now be
  // either a real number or undefined. If undefined, use the fallback value.
  const quantityToReturn = parsedQuantity !== null && parsedQuantity !== void 0 ? parsedQuantity : fallbackQuantity;

  // If no unit is parsed from the raw value, or if the fallback unit is not
  // defined, use the first value from the list of allowed units as fallback.
  let unitToReturn = parsedUnit || fallbackUnit;
  if (!unitToReturn && hasUnits(allowedUnits)) {
    unitToReturn = allowedUnits[0].value;
  }
  return [quantityToReturn, unitToReturn];
}

/**
 * Takes a unit value and finds the matching accessibility label for the
 * unit abbreviation.
 *
 * @param unit Unit value (example: `px`)
 * @return a11y label for the unit abbreviation
 */
export function getAccessibleLabelForUnit(unit) {
  const match = ALL_CSS_UNITS.find(item => item.value === unit);
  return match?.a11yLabel ? match?.a11yLabel : match?.value;
}

/**
 * Filters available units based on values defined a list of allowed unit values.
 *
 * @param allowedUnitValues Collection of allowed unit value strings.
 * @param availableUnits    Collection of available unit objects.
 * @return Filtered units.
 */
export function filterUnitsWithSettings(allowedUnitValues = [], availableUnits) {
  // Although the `isArray` check shouldn't be necessary (given the signature of
  // this typed function), it's better to stay on the side of caution, since
  // this function may be called from un-typed environments.
  return Array.isArray(availableUnits) ? availableUnits.filter(unit => allowedUnitValues.includes(unit.value)) : [];
}

/**
 * Custom hook to retrieve and consolidate units setting from add_theme_support().
 * TODO: ideally this hook shouldn't be needed
 * https://github.com/WordPress/gutenberg/pull/31822#discussion_r633280823
 *
 * @param args                An object containing units, settingPath & defaultUnits.
 * @param args.units          Collection of all potentially available units.
 * @param args.availableUnits Collection of unit value strings for filtering available units.
 * @param args.defaultValues  Collection of default values for defined units. Example: `{ px: 350, em: 15 }`.
 *
 * @return Filtered list of units, with their default values updated following the `defaultValues`
 * argument's property.
 */
export const useCustomUnits = ({
  units = ALL_CSS_UNITS,
  availableUnits = [],
  defaultValues
}) => {
  const customUnitsToReturn = filterUnitsWithSettings(availableUnits, units);
  if (defaultValues) {
    customUnitsToReturn.forEach((unit, i) => {
      if (defaultValues[unit.value]) {
        const [parsedDefaultValue] = parseQuantityAndUnitFromRawValue(defaultValues[unit.value]);
        customUnitsToReturn[i].default = parsedDefaultValue;
      }
    });
  }
  return customUnitsToReturn;
};

/**
 * Get available units with the unit for the currently selected value
 * prepended if it is not available in the list of units.
 *
 * This is useful to ensure that the current value's unit is always
 * accurately displayed in the UI, even if the intention is to hide
 * the availability of that unit.
 *
 * @param rawValue   Selected value to parse.
 * @param legacyUnit Legacy unit value, if rawValue needs it appended.
 * @param units      List of available units.
 *
 * @return A collection of units containing the unit for the current value.
 */
export function getUnitsWithCurrentUnit(rawValue, legacyUnit, units = ALL_CSS_UNITS) {
  const unitsToReturn = Array.isArray(units) ? [...units] : [];
  const [, currentUnit] = getParsedQuantityAndUnit(rawValue, legacyUnit, ALL_CSS_UNITS);
  if (currentUnit && !unitsToReturn.some(unit => unit.value === currentUnit)) {
    if (allUnits[currentUnit]) {
      unitsToReturn.unshift(allUnits[currentUnit]);
    }
  }
  return unitsToReturn;
}
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