<?php
if ( ! defined( 'ABSPATH' ) ) {
	die( 'You are not allowed to call this page directly.' );
}

class FrmStylesHelper {

	/**
	 * @return array
	 */
	public static function get_upload_base() {
		$uploads = wp_upload_dir();

		if ( is_ssl() && ! preg_match( '/^https:\/\/.*\..*$/', $uploads['baseurl'] ) ) {
			$uploads['baseurl'] = str_replace( 'http://', 'https://', $uploads['baseurl'] );
		}

		return $uploads;
	}

	/**
	 * Called from the admin header.
	 *
	 * @since 4.0
	 *
	 * @return void
	 */
	public static function save_button() {
		// phpcs:disable Generic.WhiteSpace.ScopeIndent
		?>
		<input type="submit" name="submit" class="button button-primary frm-button-primary" value="<?php esc_attr_e( 'Update', 'formidable' ); ?>" />
		<?php
		// phpcs:enable Generic.WhiteSpace.ScopeIndent
	}

	/**
	 * @since 2.05
	 *
	 * @return array
	 */
	public static function get_css_label_positions() {
		return array(
			'none'     => __( 'top', 'formidable' ),
			'left'     => __( 'left', 'formidable' ),
			'right'    => __( 'right', 'formidable' ),
			'no_label' => __( 'none', 'formidable' ),
			'inside'   => __( 'inside', 'formidable' ),
		);
	}

	/**
	 * @since 6.11 Added $field param.
	 *
	 * @param array|object $field
	 *
	 * @return array
	 */
	public static function get_single_label_positions( $field = array() ) {
		$label_positions = array(
			'top'    => __( 'Top', 'formidable' ),
			'left'   => __( 'Left', 'formidable' ),
			'right'  => __( 'Right', 'formidable' ),
			'inline' => __( 'Inline (left without a set width)', 'formidable' ),
			'none'   => __( 'None', 'formidable' ),
			'hidden' => __( 'Hidden (but leave the space)', 'formidable' ),
			'inside' => __( 'Placeholder inside the field', 'formidable' ),
		);

		/**
		 * Allows updating label positions in field settings.
		 *
		 * @since 6.11
		 *
		 * @param array        $label_positions
		 * @param array|object $field
		 */
		return apply_filters( 'frm_single_label_positions', $label_positions, $field );
	}

	/**
	 * @return array
	 */
	public static function minus_icons() {
		return array(
			0 => array(
				'-' => '62e',
				'+' => '62f',
			),
			1 => array(
				'-' => '600',
				'+' => '602',
			),
			2 => array(
				'-' => '604',
				'+' => '603',
			),
			3 => array(
				'-' => '633',
				'+' => '632',
			),
			4 => array(
				'-' => '613',
				'+' => '60f',
			),
		);
	}

	/**
	 * @return array
	 */
	public static function arrow_icons() {
		$minus_icons = self::minus_icons();

		return array(
			6    => array(
				'-' => '62d',
				'+' => '62a',
			),
			0    => array(
				'-' => '60d',
				'+' => '609',
			),
			1    => array(
				'-' => '60e',
				'+' => '60c',
			),
			2    => array(
				'-' => '630',
				'+' => '631',
			),
			3    => array(
				'-' => '62b',
				'+' => '628',
			),
			4    => array(
				'-' => '62c',
				'+' => '629',
			),
			5    => array(
				'-' => '635',
				'+' => '634',
			),
			'p0' => $minus_icons[0],
			'p1' => $minus_icons[1],
			'p2' => $minus_icons[2],
			'p3' => $minus_icons[3],
			'p4' => $minus_icons[4],
		);
	}

	/**
	 * @since 2.0
	 *
	 * @param int|string $key  Icon key.
	 * @param string     $icon Icon state, `+` or `-`.
	 * @param string     $type Icon type, such as `arrow`.
	 *
	 * @return string The class for this icon.
	 */
	public static function icon_key_to_class( $key, $icon = '+', $type = 'arrow' ) {
		if ( 'arrow' === $type && is_numeric( $key ) ) {
			// frm_arrowup6_icon.
			$arrow = array(
				'-' => 'down',
				'+' => 'up',
			);
			$class = 'frm_arrow' . $arrow[ $icon ];
		} else {
			// frm_minus1_icon.
			$key   = str_replace( 'p', '', $key );
			$plus  = array(
				'-' => 'minus',
				'+' => 'plus',
			);
			$class = 'frm_' . $plus[ $icon ];
		}

		if ( $key ) {
			$class .= $key;
		}

		return $class . '_icon';
	}

	/**
	 * @param WP_Post  $style
	 * @param FrmStyle $frm_style
	 * @param string   $type
	 *
	 * @return void
	 */
	public static function bs_icon_select( $style, $frm_style, $type = 'arrow' ) {
		$function_name = $type . '_icons';
		$icons         = self::$function_name();
		unset( $function_name );

		$name = 'arrow' === $type ? 'collapse_icon' : 'repeat_icon';
		// phpcs:disable Generic.WhiteSpace.ScopeIndent
		?>
		<div class="btn-group" id="frm_<?php echo esc_attr( $name ); ?>_select">
			<button class="multiselect dropdown-toggle btn btn-default" data-toggle="dropdown" type="button">
				<?php FrmAppHelper::icon_by_class( 'frmfont ' . self::icon_key_to_class( $style->post_content[ $name ], '+', $type ) ); ?>
				<?php FrmAppHelper::icon_by_class( 'frmfont ' . self::icon_key_to_class( $style->post_content[ $name ], '-', $type ) ); ?>
				<b class="caret"></b>
			</button>
			<ul class="multiselect-container frm-dropdown-menu">
				<?php foreach ( $icons as $key => $icon ) { ?>
					<li <?php echo $style->post_content['collapse_icon'] == $key ? 'class="active"' : ''; // phpcs:ignore Universal.Operators.StrictComparisons ?>>
						<a href="javascript:void(0);">
							<label>
								<input type="radio" value="<?php echo esc_attr( $key ); ?>" name="<?php echo esc_attr( $frm_style->get_field_name( $name ) ); ?>" <?php checked( $style->post_content[ $name ], $key ); ?> /><?php // phpcs:ignore SlevomatCodingStandard.Files.LineLength.LineTooLong ?>
								<span>
									<?php
									FrmAppHelper::icon_by_class( 'frmfont ' . self::icon_key_to_class( $key, '+', $type ) );
									FrmAppHelper::icon_by_class( 'frmfont ' . self::icon_key_to_class( $key, '-', $type ) );
									?>
								</span>
							</label>
						</a>
					</li>
				<?php } ?>
			</ul>
		</div>
		<?php
		// phpcs:enable Generic.WhiteSpace.ScopeIndent
	}

	/**
	 * Convert a color setting to a RGB CSV (without the rgb()/rgba() wrapper).
	 *
	 * @since 2.0
	 *
	 * @param string $color Color setting value. This could be hex or rgb.
	 *
	 * @return string RGB value without the rgb() wrapper.
	 */
	public static function hex2rgb( $color ) {
		$rgb = str_starts_with( $color, 'rgb' ) ? self::get_rgb_array_from_rgb( $color ) : self::get_rgb_array_from_hex( $color );
		return implode( ',', $rgb );
	}

	/**
	 * Remove the rgb()/rgba() wrapper from a RGB color and return its R, G and B values as an array.
	 *
	 * @since 6.8.3
	 *
	 * @param string $rgb    RGB value including the rgb() or rgba() wrapper.
	 *
	 * @return array<string> including three numeric values for R, G, and B.
	 */
	private static function get_rgb_array_from_rgb( $rgb ) {
		$rgb = str_replace( array( 'rgb(', 'rgba(', ')' ), '', $rgb );
		$rgb = explode( ',', $rgb );

		if ( 4 === count( $rgb ) ) {
			// Drop the alpha. The function is expected to only return r,g,b with no alpha.
			array_pop( $rgb );
		}

		return $rgb;
	}

	/**
	 * Get the R, G, and B array values from a Hex color code.
	 *
	 * @since 6.8.3
	 *
	 * @param string $hex    A hex color string.
	 *
	 * @return array<string> Including three numeric values for R, G, and B.
	 */
	private static function get_rgb_array_from_hex( $hex ) {
		$hex               = str_replace( '#', '', $hex );
		list( $r, $g, $b ) = sscanf( $hex, '%02x%02x%02x' );
		return array( $r, $g, $b );
	}

	/**
	 * @since 4.0
	 *
	 * @param string           $hex Hex color string.
	 * @param float|int|string $a   Alpha channel value.
	 *
	 * @return string
	 */
	public static function hex2rgba( $hex, $a ) {
		$rgb = self::hex2rgb( $hex );
		return 'rgba(' . $rgb . ',' . $a . ')';
	}

	/**
	 * @since 6.0
	 *
	 * @param string $rgba Color setting value. This could be hex or rgb.
	 *
	 * @return string Hex color value.
	 */
	private static function rgb_to_hex( $rgba ) {
		if ( str_starts_with( $rgba, '#' ) ) {
			// Color is already hex.
			return $rgba;
		}
		preg_match( '/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i', $rgba, $by_color );
		return sprintf( '%02x%02x%02x', $by_color[1], $by_color[2], $by_color[3] );
	}

	/**
	 * @since 6.8
	 *
	 * @param string $hsl
	 *
	 * @return string|null Null if it fails to parse the HSL string.
	 */
	private static function hsl_to_hex( $hsl ) {
		// Convert hsla to hsl.
		$hsl = preg_replace( '/hsla\((\d+),\s*([\d.]+)%,\s*([\d.]+)%,\s*([\d.]+)\)/', 'hsl($1, $2%, $3%)', $hsl );

		// Extract HSL components from the color string.
		preg_match( '/hsl\((\d+),\s*(\d+)%,\s*(\d+)%\)/', $hsl, $matches );

		if ( count( $matches ) !== 4 ) {
			// Invalid HSL string format.
			return null;
		}

		// Extract HSL values.
		$h = (int) $matches[1];
		$s = (int) $matches[2] / 100;
		$l = (int) $matches[3] / 100;

		// Calculate RGB values.
		$c = ( 1 - abs( 2 * $l - 1 ) ) * $s;
		$x = $c * ( 1 - abs( ( (int) ( $h / 60 ) % 2 ) - 1 ) );
		$m = $l - $c / 2;
		$r = 0;
		$g = 0;
		$b = 0;

		if ( $h >= 0 && $h < 60 ) {
			$r = $c;
			$g = $x;
		} elseif ( $h >= 60 && $h < 120 ) {
			$r = $x;
			$g = $c;
		} elseif ( $h >= 120 && $h < 180 ) {
			$g = $c;
			$b = $x;
		} elseif ( $h >= 180 && $h < 240 ) {
			$g = $x;
			$b = $c;
		} elseif ( $h >= 240 && $h < 300 ) {
			$r = $x;
			$b = $c;
		} elseif ( $h >= 300 && $h < 360 ) {
			$r = $c;
			$b = $x;
		}//end if

		// Convert RGB to 8-bit values
		$r = round( ( $r + $m ) * 255 );
		$g = round( ( $g + $m ) * 255 );
		$b = round( ( $b + $m ) * 255 );

		// Convert RGB to hex
		return sprintf( '%02x%02x%02x', $r, $g, $b );
	}

	/**
	 * @since 2.3
	 *
	 * @param string $hex   string  The original color in hex format #ffffff.
	 * @param int    $steps integer Should be between -255 and 255. Negative = darker, positive = lighter.
	 *
	 * @return string
	 */
	public static function adjust_brightness( $hex, $steps ) {
		$steps = max( - 255, min( 255, $steps ) );

		if ( str_starts_with( $hex, 'rgba(' ) ) {
			$rgba                   = str_replace( ')', '', str_replace( 'rgba(', '', $hex ) );
			list ( $r, $g, $b, $a ) = array_map( 'trim', explode( ',', $rgba ) );
			$r                      = max( 0, min( 255, $r + $steps ) );
			$g                      = max( 0, min( 255, $g + $steps ) );
			$b                      = max( 0, min( 255, $b + $steps ) );
			return 'rgba(' . $r . ',' . $g . ',' . $b . ',' . $a . ')';
		}

		// Normalize into a six character long hex string
		$hex = str_replace( '#', '', $hex );
		self::fill_hex( $hex );

		// Split into three parts: R, G and B
		$color_parts = str_split( $hex, 2 );
		$return      = '#';

		foreach ( $color_parts as $color ) {
			// Convert to decimal.
			$color = hexdec( $color );
			// Adjust color.
			$color = max( 0, min( 255, $color + $steps ) );

			// Make two char hex code.
			$return .= str_pad( dechex( $color ), 2, '0', STR_PAD_LEFT );
		}

		return $return;
	}

	/**
	 * @since 6.0
	 *
	 * @param string $color
	 *
	 * @return int
	 */
	public static function get_color_brightness( $color ) {
		if ( str_starts_with( $color, 'rgb' ) ) {
			$color = self::rgb_to_hex( $color );
		}

		if ( str_starts_with( $color, 'hsl' ) ) {
			$hsl_to_hex = self::hsl_to_hex( $color );

			if ( is_null( $hsl_to_hex ) ) {
				// Fallback if we cannot convert the HSL value.
				return 0;
			}

			$color = $hsl_to_hex;
		}

		self::fill_hex( $color );

		$c_r = hexdec( substr( $color, 0, 2 ) );
		$c_g = hexdec( substr( $color, 2, 2 ) );
		$c_b = hexdec( substr( $color, 4, 2 ) );

		return ( ( $c_r * 299 ) + ( $c_g * 587 ) + ( $c_b * 114 ) ) / 1000;
	}

	/**
	 * Change a 3 character hex color to a 6 character one.
	 *
	 * @since 6.0
	 *
	 * @param string $color Color value, passed by reference.
	 *
	 * @return void
	 */
	private static function fill_hex( &$color ) {
		if ( 3 === strlen( $color ) ) {
			$color = $color[0] . $color[0] . $color[1] . $color[1] . $color[2] . $color[2];
		}
	}

	/**
	 * @since 4.05.02
	 *
	 * @param array $vars CSS variable keys.
	 *
	 * @return array
	 */
	public static function get_css_vars( $vars = array() ) {
		$vars = apply_filters( 'frm_css_vars', $vars );
		return array_unique( $vars );
	}

	/**
	 * @since 4.05.02
	 *
	 * @param array $settings Style settings.
	 * @param array $defaults Default style settings.
	 * @param array $vars     CSS variable keys to output.
	 *
	 * @return void
	 */
	public static function output_vars( $settings, $defaults = array(), $vars = array() ) {
		if ( ! $vars ) {
			$vars = self::get_css_vars( array_keys( $settings ) );
		}

		$vars = array_diff( $vars, self::get_style_keys_to_remove_from_output_vars() );

		foreach ( $vars as $var ) {
			if ( ! isset( $settings[ $var ] ) || ! self::css_key_is_valid( $var ) ) {
				continue;
			}

			if ( ! isset( $defaults[ $var ] ) ) {
				$defaults[ $var ] = '';
			}

			$prepared_value = '';

			if ( self::should_add_css_var( $settings, $defaults, $var, $prepared_value ) ) {
				// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
				echo '--' . esc_html( self::clean_var_name( str_replace( '_', '-', $var ) ) ) . ':' . $prepared_value . ';';
			}
		}
	}

	/**
	 * None of these style settings are used as CSS variables, so we want to exclude them to keep the CSS output clean.
	 *
	 * @since 6.26.1
	 *
	 * @return array<string>
	 */
	private static function get_style_keys_to_remove_from_output_vars() {
		return array(
			'remove_box_shadow',
			'remove_box_shadow_active',
			'theme_css',
			'theme_name',
			'theme_selector',
			'important_style',
			'submit_style',
			'collapse_icon',
			'center_form',
			'custom_css',
			'style_class',
			'submit_bg_img',
			'change_margin',
			'repeat_icon',
			'use_base_font_size',
			'field_shape_type',
			'bg_image_id',
			'single_style_custom_css',
			'enable_style_custom_css',
		);
	}

	/**
	 * Check if a CSS variable setting is not blank, doesn't match the default, and doesn't include invalid substrings.
	 *
	 * @since 6.24
	 *
	 * @param array  $settings       Array of setting values.
	 * @param array  $defaults       Array of default values.
	 * @param string $var            The setting key name.
	 * @param string $prepared_value The value from calling css_var_prepare_value. This is set by reference so it can be used after this function is called.
	 *
	 * @return bool True if the CSS value should be printed.
	 */
	private static function should_add_css_var( $settings, $defaults, $var, &$prepared_value ) {
		$prepared_value = self::css_var_prepare_value( $settings, $var );

		if ( $prepared_value === '' ) {
			return false;
		}

		if ( $defaults && $defaults[ $var ] === $prepared_value ) {
			return false;
		}

		return self::css_value_is_valid( $prepared_value );
	}

	/**
	 * Prevent invalid CSS keys from getting added to the generated CSS.
	 *
	 * @since 6.20
	 *
	 * @param string $key
	 *
	 * @return bool
	 */
	private static function css_key_is_valid( $key ) {
		// Any key that is abnormally large is not valid.
		// Any key that contains a '{' is not valid.
		return strlen( $key ) < 100 && ! str_contains( $key, '{' );
	}

	/**
	 * Confirm a CSS value is valid.
	 * If it appears to contain JavaScript, it will not be added.
	 *
	 * @since 6.20
	 *
	 * @param string $var
	 *
	 * @return bool
	 */
	private static function css_value_is_valid( $var ) {
		if ( is_numeric( $var ) ) {
			return true;
		}

		// None of these substrings should be present in any CSS value.
		$invalid_substrings = array(
			'function(',
			';userAgent',
			';stopPropagation',
			'{const',
			'window[',
			'navigator[',
			'Array;',
		);

		foreach ( $invalid_substrings as $substring ) {
			if ( str_contains( $var, $substring ) ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Remove anything that isn't used as a CSS variable name.
	 *
	 * @param string $var_name
	 *
	 * @return string
	 */
	private static function clean_var_name( $var_name ) {
		return preg_replace( '/[^a-zA-Z0-9_-]/', '', $var_name );
	}

	/**
	 * Prepare the value for a CSS variable.
	 *
	 * @since 6.14
	 *
	 * @param array  $settings An array of css style.
	 * @param string $key
	 *
	 * @return string
	 */
	private static function css_var_prepare_value( $settings, $key ) {
		$value = $settings[ $key ];

		if ( ! is_string( $value ) && ! is_numeric( $value ) ) {
			return '';
		}

		switch ( $key ) {
			case 'font':
				return safecss_filter_attr( $value );

			case 'border_width_error':
			case 'field_border_width':
				if ( ! empty( $settings['field_shape_type'] ) && 'underline' === $settings['field_shape_type'] ) {
					return safecss_filter_attr( '0px 0px ' . $value . ' 0px' );
				}
				break;

			case 'box_shadow':
				if ( ! empty( $settings['field_shape_type'] ) && 'underline' === $settings['field_shape_type'] ) {
					return safecss_filter_attr( 'none' );
				}
				break;

			case 'border_radius':
				if ( ! empty( $settings['field_shape_type'] ) ) {
					switch ( $settings['field_shape_type'] ) {
						case 'underline':
						case 'regular':
							return safecss_filter_attr( '0px' );
						case 'circle':
							return safecss_filter_attr( '30px' );
					}
				}
				break;
		}//end switch

		return esc_html( $value );
	}

	/**
	 * @since 2.3
	 *
	 * @param WP_Post $style
	 *
	 * @return array
	 */
	public static function get_settings_for_output( $style ) {
		if ( self::previewing_style() ) {
			$frm_style = new FrmStyle();

			if ( isset( $_POST['frm_style_setting'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Missing

				// Sanitizing is done later.
				//phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.NonceVerification.Missing
				$posted = wp_unslash( $_POST['frm_style_setting'] );

				if ( is_array( $posted ) ) {
					$settings   = $frm_style->sanitize_post_content( $posted['post_content'] );
					$style_name = FrmAppHelper::get_post_param( 'style_name', '', 'sanitize_title' );
				} else {
					$posted = json_decode( $posted, true );
					FrmAppHelper::format_form_data( $posted );
					$settings   = $frm_style->sanitize_post_content( $posted['frm_style_setting']['post_content'] );
					$style_name = sanitize_title( $posted['style_name'] );
				}
			} else {
				$settings   = $frm_style->sanitize_post_content( wp_unslash( $_GET ) );
				$style_name = FrmAppHelper::get_param( 'style_name', '', 'get', 'sanitize_title' );
			}

			$settings = self::update_base_font_size( $settings, $frm_style->get_defaults() );

			FrmAppHelper::sanitize_value( 'sanitize_text_field', $settings );

			$settings['style_class'] = '';

			if ( ! empty( $style_name ) ) {
				$settings['style_class'] = $style_name . '.';
			}
		} else {
			$settings                = $style->post_content;
			$settings['style_class'] = 'frm_style_' . $style->post_name . '.';
		}//end if

		$settings['style_class']  .= 'with_frm_style';
		$settings['font']          = stripslashes( $settings['font'] );
		$settings['change_margin'] = self::description_margin_for_screensize( $settings['width'] );

		$checkbox_opts = array( 'important_style', 'auto_width', 'submit_style', 'collapse_icon', 'center_form' );

		foreach ( $checkbox_opts as $opt ) {
			if ( ! isset( $settings[ $opt ] ) ) {
				$settings[ $opt ] = 0;
			}
		}

		self::prepare_color_output( $settings );

		$settings['field_height'] = $settings['field_height'] === '' ? 'auto' : $settings['field_height'];
		$settings['field_width']  = $settings['field_width'] === '' ? 'auto' : $settings['field_width'];
		$settings['auto_width']   = $settings['auto_width'] ? 'auto' : $settings['field_width'];
		$settings['box_shadow']   = ! empty( $settings['remove_box_shadow'] ) ? 'none' : '0 1px 2px 0 rgba(18, 18, 23, 0.05)';

		if ( ! isset( $settings['repeat_icon'] ) ) {
			$settings['repeat_icon'] = 1;
		}

		return $settings;
	}

	/**
	 * Update the "Base Font Size" value from "Quick Settings across multiple settings values".
	 *
	 * @since 6.14
	 *
	 * @param array $settings An array of css style.
	 * @param array $defaults Default style settings.
	 *
	 * @return array
	 */
	public static function update_base_font_size( $settings, $defaults ) {
		if ( empty( $settings['base_font_size'] ) || empty( $settings['use_base_font_size'] ) || 'false' === $settings['use_base_font_size'] ) {
			return $settings;
		}

		$base_font_size       = (int) $settings['base_font_size'];
		$font_size            = $defaults['font_size'];
		$font_sizes_to_update = array(
			'font_size',
			'field_font_size',
			'check_font_size',
			'title_size',
			'form_desc_size',
			'description_font_size',
			'section_font_size',
			'submit_font_size',
			'success_font_size',
			'error_font_size',
			'progress_size',
		);

		array_map(
			function ( $key ) use ( $defaults, $font_size, $base_font_size, &$settings ) {
				if ( isset( $settings[ $key ] ) ) {
					$settings[ $key ] = round( self::get_base_font_size_scale( $key, $font_size, $defaults ) * $base_font_size ) . 'px';
				}
			},
			$font_sizes_to_update
		);

		return $settings;
	}

	/**
	 * Get style font size scale value.
	 *
	 * @since 6.14
	 *
	 * @param string     $key      Setting key.
	 * @param int|string $value    Base font size value.
	 * @param array      $defaults Default style settings.
	 *
	 * @return float
	 */
	private static function get_base_font_size_scale( $key, $value, $defaults ) {
		if ( empty( $defaults[ $key ] ) || ! is_numeric( (int) $defaults[ $key ] ) || ! is_numeric( (int) $value ) || 0 === (int) $value ) {
			return 1;
		}

		return round( (int) $defaults[ $key ] / (int) $value, 2 );
	}

	/**
	 * @since 2.3
	 *
	 * @param array $settings          Style settings, passed by reference.
	 * @param bool  $allow_transparent Whether transparent colors are allowed.
	 *
	 * @return void
	 */
	public static function prepare_color_output( &$settings, $allow_transparent = true ) {
		$colors = self::allow_color_override();

		foreach ( $colors as $css => $opts ) {
			if ( $css === 'transparent' && ! $allow_transparent ) {
				$css = '';
			}

			foreach ( $opts as $opt ) {
				self::get_color_output( $css, $settings[ $opt ] );
			}
		}
	}

	/**
	 * @since 2.3
	 *
	 * @return array
	 */
	private static function allow_color_override() {
		$frm_style = new FrmStyle();
		$colors    = $frm_style->get_color_settings();

		$transparent = array(
			'fieldset_color',
			'fieldset_bg_color',
			'bg_color',
			'bg_color_active',
			'bg_color_disabled',
			'section_bg_color',
			'error_bg',
			'success_bg_color',
			'progress_bg_color',
			'progress_active_bg_color',
			'submit_border_color',
			'submit_hover_border_color',
			'submit_active_border_color',
			'submit_hover_bg_color',
			'submit_active_bg_color',
		);

		return array(
			'transparent' => $transparent,
			''            => array_diff( $colors, $transparent ),
		);
	}

	/**
	 * @since 2.3
	 *
	 * @param string $default Default color value.
	 * @param string $color   Color value, passed by reference.
	 *
	 * @return void
	 */
	private static function get_color_output( $default, &$color ) {
		$color = trim( $color );

		if ( ! $color ) {
			$color = $default;
		} elseif ( str_contains( $color, 'rgb(' ) ) {
			$color = str_replace( 'rgb(', 'rgba(', $color );
			$color = str_replace( ')', ',1)', $color );
		} elseif ( ! str_contains( $color, '#' ) && self::is_hex( $color ) ) {
			$color = '#' . $color;
		}
	}

	/**
	 * If a color looks like a hex code without the #, prepend the #.
	 * A color looks like a hex code if it does not contain the substrings "rgb", "rgba", "hsl", "hsla", or "hwb".
	 *
	 * @since 6.8
	 *
	 * @param string $color
	 *
	 * @return bool
	 */
	private static function is_hex( $color ) {
		$non_hex_substrings = array(
			'rgba(',
			'hsl(',
			'hsla(',
			'hwb(',
		);

		foreach ( $non_hex_substrings as $substring ) {
			if ( str_contains( $color, $substring ) ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * If left/right label is over a certain size,
	 * adjust the field description margin at a different screen size
	 *
	 * @since 2.3
	 *
	 * @param string $width Label width value.
	 *
	 * @return false|string
	 */
	private static function description_margin_for_screensize( $width ) {
		$temp_label_width = str_replace( 'px', '', $width );
		$change_margin    = false;

		if ( $temp_label_width >= 230 ) {
			$change_margin = '800px';
		} elseif ( $width >= 215 ) {
			$change_margin = '700px';
		} elseif ( $width >= 180 ) {
			$change_margin = '650px';
		}

		return $change_margin;
	}

	/**
	 * @since 2.3
	 *
	 * @return bool
	 */
	public static function previewing_style() {
		// phpcs:ignore WordPress.Security.NonceVerification.Missing
		$ajax_change = isset( $_POST['action'] ) && $_POST['action'] === 'frm_change_styling' && isset( $_POST['frm_style_setting'] );

		return $ajax_change || isset( $_GET['flat'] );
	}

	/**
	 * Get the URL for the Styler page list view (where you can assign styles to a form and view style templates) for a target form.
	 *
	 * @since 6.0
	 *
	 * @param int|string $form_id
	 *
	 * @return string
	 */
	public static function get_list_url( $form_id ) {
		return admin_url( 'admin.php?page=formidable-styles&form=' . absint( $form_id ) );
	}

	/**
	 * Get the back button args from Style settings.
	 *
	 * @since 6.14
	 *
	 * @param stdClass|WP_Post $style
	 * @param int              $form_id
	 *
	 * @return array
	 */
	public static function get_style_options_back_button_args( $style, $form_id ) {
		if ( self::is_advanced_settings() ) {
			return array(
				'title' => __( 'Quick Settings', 'formidable' ),
				'id'    => 'frm_style_back_to_quick_settings',
			);
		}
		return array(
			'href'  => self::get_list_url( $form_id ),
			'title' => $style->post_title,
		);
	}

	/**
	 * Get a link to edit a target style post object in the visual styler.
	 *
	 * @param stdClass|WP_Post $style
	 * @param int|string       $form_id Used for the back button and preview form target.
	 * @param string           $section The url param section.
	 *
	 * @return string
	 */
	public static function get_edit_url( $style, $form_id = 0, $section = '' ) {
		$query_args = array(
			'page'       => 'formidable-styles',
			'frm_action' => 'edit',
			'id'         => $style->ID,
			'section'    => $section,
		);

		if ( $form_id ) {
			// We include &form_id for the back button to know where to point to.
			$query_args['form'] = $form_id;
		}

		return add_query_arg( $query_args, admin_url( 'admin.php' ) );
	}

	/**
	 * Get a count of the number of forms assigned to a target style ID.
	 * All unassigned forms are included in the count for the default style.
	 *
	 * @since 6.0
	 *
	 * @param int|string $style_id
	 * @param bool       $is_default
	 *
	 * @return int
	 */
	public static function get_form_count_for_style( $style_id, $is_default ) {
		$serialized = serialize( array( 'custom_style' => (string) $style_id ) );
		// Chop off the "a:1:{" from the front and the "}" from the back.
		$substring       = substr( $serialized, 5, -1 );
		$number_of_forms = FrmDb::get_count(
			'frm_forms',
			array(
				'status'       => 'published',
				'options LIKE' => $substring,
			)
		);

		if ( ! $is_default ) {
			// Exit early as the rest of the code is about including the default count.
			return $number_of_forms;
		}

		$conversational_style_id = FrmDb::get_var( 'posts', array( 'post_name' => 'lines-no-boxes' ), 'ID' );

		return $number_of_forms + self::get_default_style_count( $style_id, $conversational_style_id );
	}

	/**
	 * Get the number of forms that use the default style.
	 *
	 * @since 6.0
	 *
	 * @param int|string $style_id
	 * @param mixed      $conversational_style_id
	 *
	 * @return int
	 */
	private static function get_default_style_count( $style_id, $conversational_style_id ) {
		$substrings = array_map(
			function ( $value ) {
				$substring = serialize( array( 'custom_style' => $value ) );
				return substr( $substring, 5, -1 );
			},
			array( '1', 1 )
		);
		$where      = array(
			'status' => 'published',
			0        => array(
				'options NOT LIKE' => 'custom_style',
				'or'               => 1,
				'options LIKE'     => $substrings,
			),
		);

		if ( $conversational_style_id ) {
			// When a conversational style is set, check for it in the query by wrapping the where and adding a conversational option check.
			$is_conversational_style = (int) $style_id === (int) $conversational_style_id;
			$where[0]                = array(
				// The chat option doesn't exist if it isn't on.
				( $is_conversational_style ? 'options LIKE' : 'options NOT LIKE' ) => ';s:4:"chat";',
				$where[0],
			);
		}

		return FrmDb::get_count( 'frm_forms', $where );
	}

	/**
	 * Check if the current page is the advanced settings page.
	 *
	 * @since 6.14
	 *
	 * @return bool True if is advanced settings, false otherwise.
	 */
	public static function is_advanced_settings() {
		return FrmAppHelper::get_param( 'section' ) === 'advanced-settings' && FrmAppHelper::get_param( 'page' ) === 'formidable-styles';
	}

	/**
	 * Get wrapper classname for style editor sections.
	 *
	 * @since 6.16
	 *
	 * @param string $section_type
	 *
	 * @return string The style editor wrapper classname.
	 */
	public static function style_editor_get_wrapper_classname( $section_type ) {
		$is_quick_settings = 'quick-settings' === $section_type;
		$classname         = 'frm-style-editor-form';
		$classname        .= ( ! self::is_advanced_settings() xor $is_quick_settings ) ? ' frm_hidden' : '';

		return $classname . ( FrmAppHelper::pro_is_installed() ? ' frm-pro' : '' );
	}

	/**
	 * Retrieve the background image URL of the submit button.
	 * It may be either a full URL string (used in versions prior to 6.14) or a numeric attachment ID (introduced in version 6.14).
	 *
	 * @since 6.14
	 *
	 * @param array $settings
	 *
	 * @return false|string Return image url or false.
	 */
	public static function get_submit_image_bg_url( $settings ) {
		$background_image = $settings['submit_bg_img'];

		if ( ! $background_image ) {
			return false;
		}

		// Handle the case where the submit_bg_img is a full URL string. If the
		// Settings were saved with the older styler version prior to 6.14, the
		// submit_bg_img will be a full URL string.
		if ( ! is_numeric( $background_image ) ) {
			return $background_image;
		}

		return wp_get_attachment_url( (int) $background_image );
	}

	/**
	 * Determines if the chosen JavaScript library should be used.
	 *
	 * @since 6.13
	 *
	 * @return bool
	 */
	public static function use_chosen_js() {
		if ( ! FrmAppHelper::pro_is_installed() ) {
			return false;
		}

		return is_callable( 'FrmProAppHelper::use_chosen_js' ) ? FrmProAppHelper::use_chosen_js() : true;
	}

	/**
	 * Returns the bottom part from a margin/padding value.
	 *
	 * @since 6.17
	 *
	 * @param string $value The margin/padding value.
	 *
	 * @return string
	 */
	public static function get_bottom_value( $value ) {
		if ( ! $value ) {
			return $value;
		}

		$parts = explode( ' ', $value );

		return count( $parts ) < 3 ? $parts[0] : $parts[2];
	}

	/**
	 * Scope CSS to .frm_forms on admin pages to prevent style conflicts.
	 * On front-end pages, the CSS is returned unchanged.
	 *
	 * @since 6.30
	 *
	 * @param string $css The CSS to scope.
	 *
	 * @return string
	 */
	public static function maybe_scope_css_for_admin( $css ) {
		if ( ! self::should_scope_custom_css() ) {
			return $css;
		}

		/**
		 * Filter the CSS selector used for @scope when scoping custom CSS on admin pages.
		 *
		 * @since 6.30
		 *
		 * @param string $selector The CSS selector to scope to. Default '.frm_forms'.
		 */
		$selector = apply_filters( 'frm_scope_custom_css_selector', '.frm_forms' );

		return '@scope (' . $selector . ') {' . $css . '}';
	}

	/**
	 * Scope only the custom CSS portion of the full cached stylesheet for admin pages.
	 * Extracts the global custom CSS from the cached CSS, outputs the theme CSS unchanged,
	 * and returns only the custom CSS portion scoped.
	 *
	 * @since 6.30
	 *
	 * @param string $css The full cached CSS containing both theme and custom CSS.
	 *
	 * @return string The theme CSS with only the custom CSS portion scoped.
	 */
	public static function maybe_scope_custom_css_in_cached_output( $css ) {
		if ( ! self::should_scope_custom_css() ) {
			return $css;
		}

		$custom_css = strip_tags( FrmStylesController::get_custom_css() );

		if ( ! $custom_css ) {
			return $css;
		}

		// The cached CSS is minified. Minify the custom CSS the same way to find it.
		$minified_custom_css = self::minify_css( $custom_css );
		$custom_css_pos      = strrpos( $css, $minified_custom_css );

		if ( false !== $custom_css_pos ) {
			$css = substr( $css, 0, $custom_css_pos );
		}

		return $css . self::maybe_scope_css_for_admin( $custom_css );
	}

	/**
	 * Minify CSS by stripping comments and whitespace.
	 * Matches the minification used when saving the cached CSS file.
	 *
	 * @since 6.30
	 *
	 * @param string $css The CSS to minify.
	 *
	 * @return string
	 */
	private static function minify_css( $css ) {
		return preg_replace( '/\/\*(.|\s)*?\*\//', '', str_replace( array( "\r\n", "\r", "\n", "\t", '    ' ), '', $css ) );
	}

	/**
	 * Check if custom CSS should be scoped for admin context.
	 *
	 * @since 6.30
	 *
	 * @return bool
	 */
	private static function should_scope_custom_css() {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only, used to scope CSS output for admin context.
		return isset( $_GET['frm_scope_custom_css'] );
	}
}
