<?php

namespace Brandy\Core\Services;

use Brandy\Customizer\Panels\General\TypographySettingsSection;
use Brandy\Traits\SingletonTrait;
use Brandy\Utils\Helpers;
use Brandy\Utils\StylesDataHelpers;

/**
 * Typography Service
 */
class TypographyService {
	use SingletonTrait;

	/**
	 * Returns theme mode option key
	 *
	 * @return string
	 */
	public static function get_option_key() {
		return TypographySettingsSection::SECTION_ID;
	}

	/**
	 * Returns default settings
	 *
	 * @return array
	 *)
	 */
	public static function get_default_settings() {
		return array(
			'heading' => array(
				'font_family' => 'Outfit',
			),
			'h1'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 2.25,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.28,
			),
			'h2'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 1.875,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.33,
			),
			'h3'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 1.3125,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.475,
			),
			'h4'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 1.125,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.55,
			),
			'h5'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 1,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.625,
			),
			'h6'      => array(
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'rem',
					'value' => 0.875,
					'min'   => 0,
					'max'   => 10,
				),
				'appearance'  => 'semibold',
				'line_height' => 1.7,
			),
			'body'    => array(
				'font_family' => 'system',
				'font_size'   => array(
					'units' => array( 'px', 'rem' ),
					'unit'  => 'px',
					'value' => 16,
					'min'   => 10,
					'max'   => 30,
				),
				'appearance'  => 'regular',
				'line_height' => 1.625,
			),
		);
	}

	/**
	 * Print out global css
	 */
	public static function print_css() {
		$settings  = self::get_settings();
		$css       = '';
		$variables = array_merge(
			array(
				'--heading-font-family:' . self::parse_font( $settings['heading']['font_family'] ),
				'--body-font-family:' . self::parse_font( $settings['body']['font_family'] ),
			),
			self::get_heading_child_styles( $settings['h1'], 'h1' ),
			self::get_heading_child_styles( $settings['h2'], 'h2' ),
			self::get_heading_child_styles( $settings['h3'], 'h3' ),
			self::get_heading_child_styles( $settings['h4'], 'h4' ),
			self::get_heading_child_styles( $settings['h5'], 'h5' ),
			self::get_heading_child_styles( $settings['h6'], 'h6' ),
			self::get_heading_child_styles( $settings['body'], 'body' )
		);

		$css .= 'html{' . implode( ';', $variables ) . '}';
		echo wp_kses_post( $css );
	}

	/**
	 * Returns settings
	 *
	 * @return array
	 *)
	 */
	public static function get_settings() {
		$default_settings    = self::get_default_settings();
		$typography_settings = get_theme_mod( self::get_option_key(), $default_settings );
		$typography_settings = Helpers::recursive_wp_parse_args( $typography_settings, $default_settings );
		foreach ( array_keys( $typography_settings ) as $key ) {
			if ( ! key_exists( $key, $default_settings ) ) {
				unset( $typography_settings[ $key ] );
			}
		}
		return $typography_settings;
	}

	public static function save_settings( $data ) {

		$default_settings    = self::get_default_settings();
		$typography_settings = Helpers::recursive_wp_parse_args( $data, $default_settings );

		foreach ( array_keys( $typography_settings ) as $key ) {
			if ( ! key_exists( $key, $default_settings ) ) {
				unset( $typography_settings[ $key ] );
			}
		}

		set_theme_mod( self::get_option_key(), $typography_settings );

		do_action( 'brandy_after_saving_typography_settings', $typography_settings );
	}

	private static function get_heading_child_styles( $settings, $key = 'h1' ) {
		$result = array();
		if ( isset( $settings['font_size'] ) ) {
			$result[] = "--$key-font-size:" . StylesDataHelpers::get_dimension_css( $settings['font_size'] );
		}
		if ( isset( $settings['line_height'] ) ) {
			$result[] = "--$key-line-height:" . $settings['line_height'];
		}
		if ( isset( $settings['appearance'] ) ) {
			$result[] = "--$key-font-weight:" . self::parse_font_weight( $settings['appearance'] );
			$result[] = "--$key-font-style:" . self::parse_font_style( $settings['appearance'] );
		}
		return $result;
	}

	private static function parse_font_weight( $value ) {
		if ( false !== strpos( $value, 'thin' ) ) {
			return '100';
		}
		if ( false !== strpos( $value, 'extra_light' ) ) {
			return '200';
		}
		if ( false !== strpos( $value, 'light' ) ) {
			return '300';
		}
		if ( false !== strpos( $value, 'regular' ) ) {
			return '400';
		}
		if ( false !== strpos( $value, 'medium' ) ) {
			return '500';
		}
		if ( false !== strpos( $value, 'semibold' ) ) {
			return '600';
		}
		if ( false !== strpos( $value, 'extra_bold' ) ) {
			return '800';
		}
		if ( false !== strpos( $value, 'bold' ) ) {
			return '700';
		}
		if ( false !== strpos( $value, 'black' ) ) {
			return '900';
		}

		return '400';
	}

	private static function parse_font_style( $value ) {
		if ( false !== strpos( $value, 'italic' ) ) {
			return 'italic';
		}

		return 'normal';
	}

	public static function parse_font( $value ) {
		if ( 'system' === $value ) {
			return BRANDY_SYSTEM_FONT;
		}

		return $value;
	}

	/**
	 * Returns default typography
	 *
	 * @param array $args Value to parse
	 *
	 * @return array
	 */
	public static function get_default_typography_value( $args = array() ) {
		$default_typography = array(
			'font_style'     => array(
				'desktop' => array(
					'weight' => 400,
					'italic' => false,
				),
				'tablet'  => null,
				'mobile'  => null,
			),
			'font_size'      => array(
				'desktop' => array(
					'unit'  => 'px',
					'value' => 14,
					'min'   => 1,
					'max'   => 30,
				),
				'tablet'  => null,
				'mobile'  => null,
			),
			'line_height'    => array(
				'desktop' => array(
					'unit'  => 'px',
					'value' => 16,
					'min'   => 0,
					'max'   => 100,
				),
				'tablet'  => null,
				'mobile'  => null,
			),
			'letter_spacing' => array(
				'desktop' => array(
					'unit'  => 'px',
					'value' => 0,
					'min'   => 0,
					'max'   => 10,
				),
				'tablet'  => null,
				'mobile'  => null,
			),
			'transform'      => array(
				'desktop' => 'normal',
				'tablet'  => null,
				'mobile'  => null,
			),
			'decoration'     => array(
				'desktop' => 'normal',
				'tablet'  => null,
				'mobile'  => null,
			),
		);
		return Helpers::recursive_wp_parse_args(
			$args,
			$default_typography
		);
	}
}