<?php

/**
 * Renders the `gtm/custom-field` block on the server.
 *
 * @param array    $attributes Block attributes.
 * @param string   $content    Block default content.
 * @param WP_Block $block      Block instance.
 * @return string Returns the custom field for the current post.
 */
function gtm_render_block_custom_field( $attr, $content, $block ) {

	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}

	$post_ID            = $block->context['postId'];
	$wrapper_attributes = get_block_wrapper_attributes( ['class' => ''] );

	$inner_html = '';

	if ( $attr['metaKey'] ) {
		$metaContent = get_post_meta( $post_ID, $attr['metaKey'], true );
	}

	$should_display     = true;
	$should_display_alt = false;

	if ( $attr['displayCondition'] == 'display-all' ) {
		$should_display = true;
	} else if ( $attr['displayCondition'] == 'display-alt' ) {
		$should_display_alt = true;
		$should_display     = true;
	} else if ( $attr['displayCondition'] == 'hidden-empty' && empty( $metaContent ) ) {
		$should_display = false;
	} else if ( empty( $metaContent ) ) { // Hide when blank is a defaullt behavior
		$should_display = false;
	}

	if ( $should_display ) {
		if ( $should_display_alt ) {
			$inner_html .= '<span class="wp-block-gtm-custom-field__content-alt">' . ( $metaContent ?? '' ) . '</span>';

		} else {
			if ( ! empty( $attr['icon'] ) ) {
				$inner_html .= '<i class="gtm-icon ' . $attr['icon'] . '"></i>';
			}

			if ( ! empty( $attr['prefix'] ) ) {
				$inner_html .= '<span class="wp-block-gtm-custom-field__prefix">' . $attr['prefix'] . '</span>';
			}

			$inner_html .= '<span class="wp-block-gtm-custom-field__content">' . ( $metaContent ?? '' ) . '</span>';

			if ( ! empty( $attr['suffix'] ) ) {
				$inner_html .= '<span class="wp-block-gtm-custom-field__suffix">' . $attr['suffix'] . '</span>';
			}
		}

		return sprintf(
			'<div %1$s>%2$s</div>',
			$wrapper_attributes,
			$inner_html
		);
	}
}

/**
 * Registers the `gtm/custom-field` block on the server.
 */
function gtm_register_block_custom_field() {
	gtm_register_block_type( 'custom-field', [
		'render_callback' => 'gtm_render_block_custom_field',
	] );
}

add_action( 'init', 'gtm_register_block_custom_field', 20 );

add_filter( 'gtm.BlockStyleCompiler.gtm/custom-field', 'gtm_compile_block_css_custom_field', 10, 3 );
function gtm_compile_block_css_custom_field( $output, $attributes, $blockName ) {
	$block_style = ['classes' => [], 'style' => []];

	$block_style['classes'][] = 'gtm-block';

	gtm_css_compileCssVar( $block_style, "custom-field-icon-size", $attributes['iconSize'] );

	gtm_css_compileCssVar( $block_style, "custom-field-icon-spacing", gtm_css_parseSpacingValue( $attributes['iconSpacing'] ) );

	gtm_css_compileCssVar( $block_style, "custom-field-icon-color", gtm_css_parseColorValue( $attributes['iconColor'] ) );

	// Apply to output
	$block_style['style'] = ['{{BLOCK}}' => $block_style['style']];

	return [
		'classes' => array_merge( $output['classes'], $block_style['classes'] ),
		'style'   => array_replace_recursive( $output['style'], $block_style['style'] ),
	];
}