<?php declare(strict_types = 1);

namespace MailPoet\EmailEditor\Engine;

class Settings_Controller {

	const ALLOWED_BLOCK_TYPES = array(
		'core/button',
		'core/buttons',
		'core/paragraph',
		'core/heading',
		'core/column',
		'core/columns',
		'core/image',
		'core/list',
		'core/list-item',
		'core/group',
		'core/spacer',
	);

	const DEFAULT_SETTINGS = array(
		'enableCustomUnits' => array( 'px', '%' ),
	);

	private Theme_Controller $themeController;

	private array $iframeAssets = array();

	/**
	 * @param Theme_Controller $themeController
	 */
	public function __construct(
		Theme_Controller $themeController
	) {
		$this->themeController = $themeController;
	}

	public function init() {
		// We need to initialize these assets early because they are read from global variables $wp_styles and $wp_scripts
		// and in later WordPress page load pages they contain stuff we don't want (e.g. html for admin login popup)
		// in the post editor this is called directly in post.php
		$this->iframeAssets = _wp_get_iframed_editor_assets();
	}

	public function get_settings(): array {
		$coreDefaultSettings = \get_default_block_editor_settings();
		$themeSettings       = $this->themeController->get_settings();

		$settings                      = array_merge( $coreDefaultSettings, self::DEFAULT_SETTINGS );
		$settings['allowedBlockTypes'] = self::ALLOWED_BLOCK_TYPES;
		// Assets for iframe editor (component styles, scripts, etc.)
		$settings['__unstableResolvedAssets'] = $this->iframeAssets;
		$editorContentStyles                  = file_get_contents( __DIR__ . '/content-editor.css' );
		$sharesContentStyles                  = file_get_contents( __DIR__ . '/content-shared.css' );
		$settings['styles']                   = array(
			array( 'css' => $editorContentStyles ),
			array( 'css' => $sharesContentStyles ),
		);

		$settings['__experimentalFeatures'] = $themeSettings;
		// Controls which alignment options are available for blocks
		$settings['supportsLayout']              = true; // Allow using default layouts
		$settings['__unstableIsBlockBasedTheme'] = true; // For default setting this to true disables wide and full alignments
		return $settings;
	}

	/**
	 * @return array{contentSize: string, wideSize: string}
	 */
	public function getLayout(): array {
		$layoutSettings = $this->themeController->get_layout_settings();
		return array(
			'contentSize' => $layoutSettings['contentSize'],
			'wideSize'    => $layoutSettings['wideSize'],
		);
	}

	/**
	 * @return array{
	 *   spacing: array{
	 *     blockGap: string,
	 *     padding: array{bottom: string, left: string, right: string, top: string}
	 *   },
	 *   color: array{
	 *     background: string
	 *   },
	 *   typography: array{
	 *     fontFamily: string
	 *   }
	 * }
	 */
	public function getEmailStyles(): array {
		$theme = $this->getTheme();
		return $theme->get_data()['styles'];
	}

	public function getLayoutWidthWithoutPadding(): string {
		$styles = $this->getEmailStyles();
		$layout = $this->getLayout();
		$width  = $this->parseNumberFromStringWithPixels( $layout['contentSize'] );
		$width -= $this->parseNumberFromStringWithPixels( $styles['spacing']['padding']['left'] );
		$width -= $this->parseNumberFromStringWithPixels( $styles['spacing']['padding']['right'] );
		return "{$width}px";
	}

	public function parseStylesToArray( string $styles ): array {
		$styles       = explode( ';', $styles );
		$parsedStyles = array();
		foreach ( $styles as $style ) {
			$style = explode( ':', $style );
			if ( count( $style ) === 2 ) {
				$parsedStyles[ trim( $style[0] ) ] = trim( $style[1] );
			}
		}
		return $parsedStyles;
	}

	public function parseNumberFromStringWithPixels( string $string ): float {
		return (float) str_replace( 'px', '', $string );
	}

	public function getTheme(): \WP_Theme_JSON {
		return $this->themeController->get_theme();
	}

	public function translateSlugToFontSize( string $fontSize ): string {
		return $this->themeController->translate_slug_to_font_size( $fontSize );
	}

	public function translateSlugToColor( string $colorSlug ): string {
		return $this->themeController->translate_slug_to_color( $colorSlug );
	}
}