<?php

/**

 * Duotone block support flag.

 *

 * Parts of this source were derived and modified from TinyColor,

 * released under the MIT license.

 *

 * https://github.com/bgrins/TinyColor

 *

 * Copyright (c), Brian Grinstead, http://briangrinstead.com

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 * @package WordPress

 * @since 5.8.0

 */

/**

 * Takes input from [0, n] and returns it as [0, 1].

 *

 * Direct port of TinyColor's function, lightly simplified to maintain

 * consistency with TinyColor.

 *

 * @see https://github.com/bgrins/TinyColor

 *

 * @since 5.8.0

 * @access private

 *

 * @param mixed $n   Number of unknown type.

 * @param int   $max Upper value of the range to bound to.

 * @return float Value in the range [0, 1].

 */

function wp_tinycolor_bound01( $n, $max ) {

	if ( 'string' === gettype( $n ) && false !== strpos( $n, '.' ) && 1 === (float) $n ) {

		$n = '100%';

	}

	$n = min( $max, max( 0, (float) $n ) );

	// Automatically convert percentage into number.

	if ( 'string' === gettype( $n ) && false !== strpos( $n, '%' ) ) {

		$n = (int) ( $n * $max ) / 100;

	}

	// Handle floating point rounding errors.

	if ( ( abs( $n - $max ) < 0.000001 ) ) {

		return 1.0;

	}

	// Convert into [0, 1] range if it isn't already.

	return ( $n % $max ) / (float) $max;

}

/**

 * Direct port of tinycolor's boundAlpha function to maintain consistency with

 * how tinycolor works.

 *

 * @see https://github.com/bgrins/TinyColor

 *

 * @since 5.9.0

 * @access private

 *

 * @param mixed $n Number of unknown type.

 * @return float Value in the range [0,1].

 */

function _wp_tinycolor_bound_alpha( $n ) {

	if ( is_numeric( $n ) ) {

		$n = (float) $n;

		if ( $n >= 0 && $n <= 1 ) {

			return $n;

		}

	}

	return 1;

}

/**

 * Rounds and converts values of an RGB object.

 *

 * Direct port of TinyColor's function, lightly simplified to maintain

 * consistency with TinyColor.

 *

 * @see https://github.com/bgrins/TinyColor

 *

 * @since 5.8.0

 * @access private

 *

 * @param array $rgb_color RGB object.

 * @return array Rounded and converted RGB object.

 */

function wp_tinycolor_rgb_to_rgb( $rgb_color ) {

	return array(

		'r' => wp_tinycolor_bound01( $rgb_color['r'], 255 ) * 255,

		'g' => wp_tinycolor_bound01( $rgb_color['g'], 255 ) * 255,

		'b' => wp_tinycolor_bound01( $rgb_color['b'], 255 ) * 255,

	);

}

/**

 * Helper function for hsl to rgb conversion.

 *

 * Direct port of TinyColor's function, lightly simplified to maintain

 * consistency with TinyColor.

 *

 * @see https://github.com/bgrins/TinyColor

 *

 * @since 5.8.0

 * @access private

 *

 * @param float $p first component.

 * @param float $q second component.

 * @param float $t third component.

 * @return float R, G, or B component.

 */

function wp_tinycolor_hue_to_rgb( $p, $q, $t ) {

	if ( $t < 0 ) {

		$t += 1;

	}

	if ( $t > 1 ) {

		$t -= 1;

	}

	if ( $t < 1 / 6 ) {

		return $p + ( $q - $p ) * 6 * $t;

	}

	if ( $t < 1 / 2 ) {

		return $q;

	}

	if ( $t < 2 / 3 ) {

		return $p + ( $q - $p ) * ( 2 / 3 - $t ) * 6;

	}

	return $p;

}

/**

 * Converts an HSL object to an RGB object with converted and rounded values.

 *

 * Direct port of TinyColor's function, lightly simplified to maintain

 * consistency with TinyColor.

 *

 * @see https://github.com/bgrins/TinyColor

 *

 * @since 5.8.0

 * @access private

 *

 * @param array $hsl_color HSL object.

 * @return array Rounded and converted RGB object.

 */

function wp_tinycolor_hsl_to_rgb( $hsl_color ) {

	$h = wp_tinycolor_bound01( $hsl_color['h'], 360 );

	$s = wp_tinycolor_bound01( $hsl_color['s'], 100 );

	$l = wp_tinycolor_bound01( $hsl_color['l'], 100 );

	if ( 0 === $s ) {

		// Achromatic.

		$r = $l;

		$g = $l;

		$b = $l;

	} else {

		$q = $l < 0.5 ? $l * ( 1 + $s ) : $l + $s - $l * $s;

		$p = 2 * $l - $q;

		$r = wp_tinycolor_hue_to_rgb( $p, $q, $h + 1 / 3 );

		$g = wp_tinycolor_hue_to_rgb( $p, $q, $h );

		$b = wp_tinycolor_hue_to_rgb( $p, $q, $h - 1 / 3 );

	}

	return array(

		'r' => $r * 255,

		'g' => $g * 255,

		'b' => $b * 255,

	);

}

/**

 * Parses hex, hsl, and rgb CSS strings using the same regex as TinyColor v1.4.2

 * used in the JavaScript. Only colors output from react-color are implemented.

 *

 * Direct port of TinyColor's function, lightly simplified to maintain

 * consistency with TinyColor.

 *

 * @see https://github.com/bgrins/TinyColor

 * @see https://github.com/casesandberg/react-color/

 *

 * @since 5.8.0

 * @since 5.9.0 Added alpha processing.

 * @access private

 *

 * @param string $color_str CSS color string.

 * @return array RGB object.

 */

function wp_tinycolor_string_to_rgb( $color_str ) {

	$color_str = strtolower( trim( $color_str ) );

	$css_integer = '[-\\+]?\\d+%?';

	$css_number  = '[-\\+]?\\d*\\.\\d+%?';

	$css_unit = '(?:' . $css_number . ')|(?:' . $css_integer . ')';

	$permissive_match3 = '[\\s|\\(]+(' . $css_unit . ')[,|\\s]+(' . $css_unit . ')[,|\\s]+(' . $css_unit . ')\\s*\\)?';

	$permissive_match4 = '[\\s|\\(]+(' . $css_unit . ')[,|\\s]+(' . $css_unit . ')[,|\\s]+(' . $css_unit . ')[,|\\s]+(' . $css_unit . ')\\s*\\)?';

	$rgb_regexp = '/^rgb' . $permissive_match3 . '$/';

	if ( preg_match( $rgb_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => $match[1],

				'g' => $match[2],

				'b' => $match[3],

			)

		);

		$rgb['a'] = 1;

		return $rgb;

	}

	$rgba_regexp = '/^rgba' . $permissive_match4 . '$/';

	if ( preg_match( $rgba_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => $match[1],

				'g' => $match[2],

				'b' => $match[3],

			)

		);

		$rgb['a'] = _wp_tinycolor_bound_alpha( $match[4] );

		return $rgb;

	}

	$hsl_regexp = '/^hsl' . $permissive_match3 . '$/';

	if ( preg_match( $hsl_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_hsl_to_rgb(

			array(

				'h' => $match[1],

				's' => $match[2],

				'l' => $match[3],

			)

		);

		$rgb['a'] = 1;

		return $rgb;

	}

	$hsla_regexp = '/^hsla' . $permissive_match4 . '$/';

	if ( preg_match( $hsla_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_hsl_to_rgb(

			array(

				'h' => $match[1],

				's' => $match[2],

				'l' => $match[3],

			)

		);

		$rgb['a'] = _wp_tinycolor_bound_alpha( $match[4] );

		return $rgb;

	}

	$hex8_regexp = '/^#?([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})$/';

	if ( preg_match( $hex8_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => base_convert( $match[1], 16, 10 ),

				'g' => base_convert( $match[2], 16, 10 ),

				'b' => base_convert( $match[3], 16, 10 ),

			)

		);

		$rgb['a'] = _wp_tinycolor_bound_alpha(

			base_convert( $match[4], 16, 10 ) / 255

		);

		return $rgb;

	}

	$hex6_regexp = '/^#?([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})$/';

	if ( preg_match( $hex6_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => base_convert( $match[1], 16, 10 ),

				'g' => base_convert( $match[2], 16, 10 ),

				'b' => base_convert( $match[3], 16, 10 ),

			)

		);

		$rgb['a'] = 1;

		return $rgb;

	}

	$hex4_regexp = '/^#?([0-9a-fA-F]{1})([0-9a-fA-F]{1})([0-9a-fA-F]{1})([0-9a-fA-F]{1})$/';

	if ( preg_match( $hex4_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => base_convert( $match[1] . $match[1], 16, 10 ),

				'g' => base_convert( $match[2] . $match[2], 16, 10 ),

				'b' => base_convert( $match[3] . $match[3], 16, 10 ),

			)

		);

		$rgb['a'] = _wp_tinycolor_bound_alpha(

			base_convert( $match[4] . $match[4], 16, 10 ) / 255

		);

		return $rgb;

	}

	$hex3_regexp = '/^#?([0-9a-fA-F]{1})([0-9a-fA-F]{1})([0-9a-fA-F]{1})$/';

	if ( preg_match( $hex3_regexp, $color_str, $match ) ) {

		$rgb = wp_tinycolor_rgb_to_rgb(

			array(

				'r' => base_convert( $match[1] . $match[1], 16, 10 ),

				'g' => base_convert( $match[2] . $match[2], 16, 10 ),

				'b' => base_convert( $match[3] . $match[3], 16, 10 ),

			)

		);

		$rgb['a'] = 1;

		return $rgb;

	}

	/*

	 * The JS color picker considers the string "transparent" to be a hex value,

	 * so we need to handle it here as a special case.

	 */

	if ( 'transparent' === $color_str ) {

		return array(

			'r' => 0,

			'g' => 0,

			'b' => 0,

			'a' => 0,

		);

	}

}

/**

 * Returns the prefixed id for the duotone filter for use as a CSS id.

 *

 * @since 5.9.1

 * @access private

 *

 * @param array $preset Duotone preset value as seen in theme.json.

 * @return string Duotone filter CSS id.

 */

function wp_get_duotone_filter_id( $preset ) {

	if ( ! isset( $preset['slug'] ) ) {

		return '';

	}

	return 'wp-duotone-' . $preset['slug'];

}

/**

 * Returns the CSS filter property url to reference the rendered SVG.

 *

 * @since 5.9.0

 * @access private

 *

 * @param array $preset Duotone preset value as seen in theme.json.

 * @return string Duotone CSS filter property url value.

 */

function wp_get_duotone_filter_property( $preset ) {

	$filter_id = wp_get_duotone_filter_id( $preset );

	return "url('#" . $filter_id . "')";

}

/**

 * Returns the duotone filter SVG string for the preset.

 *

 * @since 5.9.1

 * @access private

 *

 * @param array $preset Duotone preset value as seen in theme.json.

 * @return string Duotone SVG filter.

 */

function wp_get_duotone_filter_svg( $preset ) {

	$filter_id = wp_get_duotone_filter_id( $preset );

	$duotone_values = array(

		'r' => array(),

		'g' => array(),

		'b' => array(),

		'a' => array(),

	);

	if ( ! isset( $preset['colors'] ) || ! is_array( $preset['colors'] ) ) {

		$preset['colors'] = array();

	}

	foreach ( $preset['colors'] as $color_str ) {

		$color = wp_tinycolor_string_to_rgb( $color_str );

		$duotone_values['r'][] = $color['r'] / 255;

		$duotone_values['g'][] = $color['g'] / 255;

		$duotone_values['b'][] = $color['b'] / 255;

		$duotone_values['a'][] = $color['a'];

	}