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* Get contrast color relative to given color.

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* @since 1.8.8

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* @param string|array $color The color.

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* @return string

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private function get_contrast_color( $color ): string {

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$rgba = is_array( $color ) ? $color : $this->get_color_as_rgb_array( $color );

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$avg = (int) ( ( ( array_sum( $rgba ) ) / 3 ) * ( $rgba[3] ?? 1 ) );

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return $avg < 128 ? '#ffffff' : '#000000';

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}

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/**

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* Get size CSS vars.

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* @since 1.8.3

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* @since 1.8.8 Removed $css_vars argument.

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* @param array $attr Attributes passed by integration.

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* @return array

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private function get_size_css_vars( array $attr ): array {

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$size_items = [ 'field', 'label', 'button', 'container-shadow' ];

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$size_css_vars = [];

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foreach ( $size_items as $item ) {

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$item_attr = preg_replace_callback(

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'/-(\w)/',

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static function ( $matches ) {

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return strtoupper( $matches[1] );

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$item

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);

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$item_attr .= 'Size';

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$item_key = $item . '-size';

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$item_constant = 'self::' . str_replace( '-', '_', strtoupper( $item ) ) . '_SIZE';

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if ( empty( $attr[ $item_attr ] ) ) {

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continue;

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}

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$size_css_vars[] = $this->get_complex_vars( $item_key, constant( $item_constant )[ $attr[ $item_attr ] ] );

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}

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return empty( $size_css_vars ) ? [] : array_merge( ...$size_css_vars );

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}

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/**

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* Get color as an array of RGB(A) values.

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* @since 1.8.8

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* @param string $color Color.

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* @return array|bool Color as an array of RGBA values. False on error.

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private function get_color_as_rgb_array( $color ) {

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// Remove # from the beginning of the string and remove whitespaces.

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$color = preg_replace( '/^#/', '', strtolower( trim( $color ) ) );

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$color = str_replace( ' ', '', $color );

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

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$color = 'rgba(0,0,0,0)';

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}

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$rgba = $color;

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$rgb_array = [];

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// Check if color is in HEX(A) format.

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$is_hex = preg_match( '/[0-9a-f]{6,8}$/', $rgba );

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if ( $is_hex ) {

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// Search and split HEX(A) color into an array of couples of chars.

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preg_match_all( '/\w\w/', $rgba, $rgb_array );

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$rgb_array = array_map(

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static function ( $value ) {

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return hexdec( '0x' . $value );

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$rgb_array[0] ?? []

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);

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$rgb_array[3] = ( $rgb_array[3] ?? 255 ) / 255;

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} else {

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$rgba = preg_replace( '/[^\d,.]/', '', $rgba );

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$rgb_array = explode( ',', $rgba );

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}

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return $rgb_array;

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}

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}

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