<?php

class WPML_LS_Inline_Styles {

	/* @var WPML_LS_Templates $templates */
	private $templates;

	/* @var WPML_LS_Settings $settings */
	private $settings;

	/* @var WPML_LS_Model_Build $model_build */
	private $model_build;

	/**
	 * WPML_Language_Switcher_Render_Assets constructor.
	 *
	 * @param WPML_LS_Templates   $templates
	 * @param WPML_LS_Settings    $settings
	 * @param WPML_LS_Model_Build $model_build
	 */
	public function __construct( $templates, $settings, $model_build ) {
		$this->templates   = $templates;
		$this->settings    = $settings;
		$this->model_build = $model_build;
	}

	public function init_hooks() {
		add_action( 'wp_enqueue_scripts', array( $this, 'wp_enqueue_scripts_action' ), 20 );
	}

	/**
	 * @param WPML_LS_Slot $slot
	 *
	 * @return string
	 */
	private function get_slot_color_picker_css( $slot ) {
		$css = '';

		if ( $slot->is_menu() ) {
			$css = $this->get_slot_color_picker_css_for_menus( $slot );
		} elseif ( ! $slot->is_post_translations() || $slot->is_footer() ) {
			$css = $this->get_slot_color_picker_css_for_widgets_and_statics( $slot );
		}

		return $this->sanitize_css( $css );
	}

	/**
	 * @param WPML_LS_Slot $slot
	 *
	 * @return string
	 */
	private function get_slot_color_picker_css_for_menus( $slot ) {
		$css             = '';
		$prefix          = '.' . $this->model_build->get_css_prefix();
		$menu_item_class = $prefix . 'slot-' . $slot->slug();

		if ( $slot->get( 'background_other_normal' ) || $slot->get( 'font_other_normal' ) ) {
			$css .= "$menu_item_class,";
			$css .= " $menu_item_class a,";
			$css .= " $menu_item_class a:visited{";
			$css .= $slot->get( 'background_other_normal' ) ? "background-color:{$slot->get( 'background_other_normal' )};" : '';
			$css .= $slot->get( 'font_other_normal' ) ? "color:{$slot->get( 'font_other_normal' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_other_hover' ) || $slot->get( 'background_other_hover' ) ) {
			$css .= "$menu_item_class:hover,";
			$css .= " $menu_item_class:hover a,";
			$css .= " $menu_item_class a:hover{";
			$css .= $slot->get( 'font_other_hover' ) ? "color:{$slot->get( 'font_other_hover' )};" : '';
			$css .= $slot->get( 'background_other_hover' ) ? "background-color:{$slot->get( 'background_other_hover' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_current_normal' ) || $slot->get( 'background_current_normal' ) ) {
			$css .= "$menu_item_class{$prefix}current-language,";
			$css .= " $menu_item_class{$prefix}current-language a,";
			$css .= " $menu_item_class{$prefix}current-language a:visited{";
			$css .= $slot->get( 'font_current_normal' ) ? "color:{$slot->get( 'font_current_normal' )};" : '';
			$css .= $slot->get( 'background_current_normal' ) ? "background-color:{$slot->get( 'background_current_normal' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_current_hover' ) || $slot->get( 'background_current_hover' ) ) {
			$css .= "$menu_item_class{$prefix}current-language:hover,";
			$css .= " $menu_item_class{$prefix}current-language:hover a,";
			$css .= " $menu_item_class{$prefix}current-language a:hover{";
			$css .= $slot->get( 'font_current_hover' ) ? "color:{$slot->get( 'font_current_hover' )};" : '';
			$css .= $slot->get( 'background_current_hover' ) ? "background-color:{$slot->get( 'background_current_hover' )};" : '';
			$css .= '}';
		}

		// Override parent menu styles for hierarchical menus
		if ( $slot->get( 'is_hierarchical' ) ) {

			if ( $slot->get( 'background_other_normal' ) || $slot->get( 'font_other_normal' ) ) {
				$css .= "$menu_item_class{$prefix}current-language $menu_item_class,";
				$css .= " $menu_item_class{$prefix}current-language $menu_item_class a,";
				$css .= " $menu_item_class{$prefix}current-language $menu_item_class a:visited{";
				$css .= $slot->get( 'background_other_normal' ) ? "background-color:{$slot->get( 'background_other_normal' )};" : '';
				$css .= $slot->get( 'font_other_normal' ) ? "color:{$slot->get( 'font_other_normal' )};" : '';
				$css .= '}';
			}

			if ( $slot->get( 'font_other_hover' ) || $slot->get( 'background_other_hover' ) ) {
				$css .= "$menu_item_class{$prefix}current-language $menu_item_class:hover,";
				$css .= " $menu_item_class{$prefix}current-language $menu_item_class:hover a,";
				$css .= " $menu_item_class{$prefix}current-language $menu_item_class a:hover {";
				$css .= $slot->get( 'font_other_hover' ) ? "color:{$slot->get( 'font_other_hover' )};" : '';
				$css .= $slot->get( 'background_other_hover' ) ? "background-color:{$slot->get( 'background_other_hover' )};" : '';
				$css .= '}';
			}
		}

		return $css;
	}

	/**
	 * @param WPML_LS_Slot $slot
	 *
	 * @return string
	 */
	private function get_slot_color_picker_css_for_widgets_and_statics( $slot ) {
		$css           = '';
		$prefix        = '.' . $this->model_build->get_css_prefix();
		$wrapper_class = '.' . $this->model_build->get_slot_css_main_class( $slot->group(), $slot->slug() );

		if ( $slot->get( 'background_normal' ) ) {
			$css .= "$wrapper_class{";
			$css .= "background-color:{$slot->get( 'background_normal' )};";
			$css .= '}';
		}

		if ( $slot->get( 'border_normal' ) ) {
			$css .= "$wrapper_class, $wrapper_class {$prefix}sub-menu, $wrapper_class a {";
			$css .= "border-color:{$slot->get( 'border_normal' )};";
			$css .= '}';
		}

		if ( $slot->get( 'font_other_normal' ) || $slot->get( 'background_other_normal' ) ) {
			$css .= "$wrapper_class a, $wrapper_class .wpml-ls-sub-menu a, $wrapper_class .wpml-ls-sub-menu a:link, $wrapper_class li:not(.wpml-ls-current-language) .wpml-ls-link, $wrapper_class li:not(.wpml-ls-current-language) .wpml-ls-link:link {";
			$css .= $slot->get( 'font_other_normal' ) ? "color:{$slot->get( 'font_other_normal' )};" : '';
			$css .= $slot->get( 'background_other_normal' ) ? "background-color:{$slot->get( 'background_other_normal' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_other_hover' ) || $slot->get( 'background_other_hover' ) ) {
			$css .= "$wrapper_class a, $wrapper_class .wpml-ls-sub-menu a:hover,$wrapper_class .wpml-ls-sub-menu a:focus, $wrapper_class .wpml-ls-sub-menu a:link:hover, $wrapper_class .wpml-ls-sub-menu a:link:focus  {";
			$css .= $slot->get( 'font_other_hover' ) ? "color:{$slot->get( 'font_other_hover' )};" : '';
			$css .= $slot->get( 'background_other_hover' ) ? "background-color:{$slot->get( 'background_other_hover' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_current_normal' ) || $slot->get( 'background_current_normal' ) ) {
			$css .= "$wrapper_class {$prefix}current-language > a {";
			$css .= $slot->get( 'font_current_normal' ) ? "color:{$slot->get( 'font_current_normal' )};" : '';
			$css .= $slot->get( 'background_current_normal' ) ? "background-color:{$slot->get( 'background_current_normal' )};" : '';
			$css .= '}';
		}

		if ( $slot->get( 'font_current_hover' ) || $slot->get( 'background_current_hover' ) ) {
			$css .= "$wrapper_class {$prefix}current-language:hover>a, $wrapper_class {$prefix}current-language>a:focus {";
			$css .= $slot->get( 'font_current_hover' ) ? "color:{$slot->get( 'font_current_hover' )};" : '';
			$css .= $slot->get( 'background_current_hover' ) ? "background-color:{$slot->get( 'background_current_hover' )};" : '';
			$css .= '}';
		}

		return $css;
	}

	/**
	 * @param array $slots
	 *
	 * @return string
	 */
	public function get_slots_inline_styles( $slots ) {
		$all_styles = '';

		if ( $this->settings->can_load_styles() ) {

			foreach ( $slots as $slot ) {
				/* @var WPML_LS_Slot $slot */
				$css = $this->get_slot_color_picker_css( $slot );

				if ( $css ) {
					$style_id    = 'wpml-ls-inline-styles-' . $slot->group() . '-' . $slot->slug();
					$all_styles .= '<style type="text/css" id="' . $style_id . '">' . $css . '</style>' . PHP_EOL;
				}
			}
		}

		return $all_styles;
	}

	/**
	 * @return string
	 */
	public function get_additional_style() {
		$css = $this->sanitize_css( $this->settings->get_setting( 'additional_css' ) );

		if ( $css ) {
			$css = '<style type="text/css" id="wpml-ls-inline-styles-additional-css">' . $css . '</style>' . PHP_EOL;
		}

		return $css;
	}

	public function wp_enqueue_scripts_action() {
		$this->enqueue_inline_styles();
	}

	private function enqueue_inline_styles() {
		if ( $this->settings->can_load_styles() ) {
			$active_slots        = $this->settings->get_active_slots();
			$first_valid_handler = $this->get_first_valid_style_handler( $active_slots );

			foreach ( $active_slots as $slot ) {
				/* @var WPML_LS_Slot $slot */
				$css = $this->get_slot_color_picker_css( $slot );

				if ( empty( $css ) ) {
					continue;
				}

				$template = $this->templates->get_template( $slot->template() );

				if ( $template->has_styles() ) {
					wp_add_inline_style( $template->get_inline_style_handler(), $css );
				} elseif ( $first_valid_handler ) {
					wp_add_inline_style( $first_valid_handler, $css );
				} else {
					echo $this->get_raw_inline_style_tag( $slot, $css );
				}
			}

			if ( $first_valid_handler ) {
				$additional_css = $this->sanitize_css( $this->settings->get_setting( 'additional_css' ) );

				if ( ! empty( $additional_css ) ) {
					wp_add_inline_style( $first_valid_handler, $additional_css );
				}
			} else {
				echo $this->get_additional_style();
			}
		}
	}

	/**
	 * @param array $active_slots
	 *
	 * @return bool|mixed|null|string
	 */
	private function get_first_valid_style_handler( $active_slots ) {
		$first_handler = null;

		foreach ( $active_slots as $slot ) {
			/* @var WPML_LS_Slot $slot */
			$template = $this->templates->get_template( $slot->template() );
			$handler  = $template->get_inline_style_handler();

			if ( $handler ) {
				$first_handler = $handler;
				break;
			}
		}

		return $first_handler;
	}

	public function admin_output() {
		if ( $this->settings->can_load_styles() ) {
			$active_slots = $this->settings->get_active_slots();

			foreach ( $active_slots as $slot ) {
				/* @var WPML_LS_Slot $slot */
				$css = $this->get_slot_color_picker_css( $slot );
				echo $this->get_raw_inline_style_tag( $slot, $css );
			}

			echo $this->get_additional_style();
		}
	}

	/**
	 * @param WPML_LS_Slot $slot
	 * @param string       $css
	 *
	 * @return string
	 */
	private function get_raw_inline_style_tag( $slot, $css ) {
		$style_id = 'wpml-ls-inline-styles-' . $slot->group() . '-' . $slot->slug();
		return '<style type="text/css" id="' . $style_id . '">' . $css . '</style>' . PHP_EOL;
	}

	/**
	 * @param string $css
	 *
	 * @return string
	 */
	private function sanitize_css( $css ) {
		$css = wp_strip_all_tags( $css );
		$css = preg_replace( '/\s+/S', ' ', trim( $css ) );
		return $css;
	}
}