<?php

namespace AdPresso\Frontend;

use AdPresso\Constants;
use AdPresso\Entities\Entity;
use AdPresso\Entities\Group;
use AdPresso\Entities\Placement;
use AdPresso\Infrastructure\Settings;

defined( 'ABSPATH' ) || exit;

/**
 * Generates hidden, secured and unique HTML data attributes for the frontend.
 * Prevents ad blocker detection and prepares data for the JS-tracking.
 */
class FrontendAttributes {

	/**
	 * Level 1: Generates the attributes for the outer placement wrapper.
	 *
	 * @param Entity $placement The placement object.
	 *
	 * @return string HTML attribute string (e.g. data-p2-wrap="xyz" data-p2-instance="a7b8c")
	 */
	public static function for_wrap( Entity $placement ): string {
		$prefix = self::get_prefix();

		// Identifies the placement for JS logic and the debugger.
		// Adds an unique hash to prevent DOM-conflicts with repeats.
		$attrs = [
			"data-{$prefix}-wrap"     => $placement->get_public_id(),
			"data-{$prefix}-instance" => uniqid( '', false ),
		];

		return self::render_attributes( $attrs );
	}

	/**
	 * Level 2: Generates the attributes for a group (collection).
	 *
	 * @param Entity $group The group object.
	 *
	 * @return string HTML-Attribute string
	 */
	public static function for_collection( Entity $group ): string {
		$prefix = self::get_prefix();

		$attrs = [
			"data-{$prefix}-collection" => $group->get_id(),
		];

		return self::render_attributes( $attrs );
	}

	/**
	 * Level 3: Generates the attributes for an ad.
	 * This is the anchor for the JS tracking.
	 *
	 * @param Entity $ad      The ad object.
	 * @param array  $context The Render-context (e.g. placement_id, group_id).
	 *
	 * @return string HTML-Attribute string
	 */
	public static function for_item( Entity $ad, array $context = [] ): string {
		$prefix = self::get_prefix();

		// Item-ID for JS and Debugger
		$attrs = [
			"data-{$prefix}-item" => $ad->get_id(),
		];

		$tracking_globally = (bool) Settings::get_setting( 'enable_module_tracking', false );
		// TODO: get sense-full value
		$tracking_ad = $ad->get_meta( 'tracking_enabled', true );

		if ( $tracking_globally && $tracking_ad ) {
			// 't' signalizes that the ad should be tracked.
			$attrs["data-{$prefix}-t"] = '1';

			if ( ! empty( $context ) ) {
				foreach ( $context as $key => $value ) {
					if ( ! is_string( $value ) ) {
						continue;
					}
					// Translate keys in neutral ones.
					$safe_key = match ( $key ) {
						'placement_id' => 'w-ctx', // Wrapper Context
						'group_id' => 'c-ctx', // Collection Context
						default => sanitize_key( $key ),
					};

					$attrs["data-{$prefix}-{$safe_key}"] = $value ?? 0;
				}
			}
		}

		return self::render_attributes( $attrs );
	}

	/**
	 * Level 4 (JS): Generates the attributes for the invisible Placeholder script (Client-Side Rendering).
	 *
	 * @param Placement $placement The placement object.
	 *
	 * @return string HTML-Attribute string
	 */
	public static function for_placeholder( Placement $placement ): string {
		$prefix = self::get_prefix();
		$item   = $placement->get_item();

		$item_id   = $item ? $item->get_id() : 0;
		$item_type = $item ? ( ( $item instanceof Group ) ? '2' : '1' ) : '0'; // 1 = Ad, 2 = Group, 0 = None

		$attrs = [
			'id'                  => sprintf( '%s-%s', $prefix, $placement->get_public_id() ), // Script will be removed from the DOM anyway.
			"data-{$prefix}-wrap" => $placement->get_public_id(),
			"data-{$prefix}-item" => $item_id,
			"data-{$prefix}-type" => $item_type,
		];

		// Add In-Content injection rules
		if ( $placement->get_type() === 'content' ) {
			$attrs["data-{$prefix}-tgt"] = $placement->get_meta( 'position_element', 'p' );
			$attrs["data-{$prefix}-nth"] = max( 1, absint( $placement->get_meta( 'position_after', 1 ) ) );
			$attrs["data-{$prefix}-mth"] = $placement->get_meta( 'position_method', 'after' );
		}

		return self::render_attributes( $attrs );
	}

	/**
	 * Get the frontend prefix from the settings.
	 */
	private static function get_prefix(): string {
		return sanitize_html_class( Settings::get_setting( 'frontend_prefix', Constants::DEFAULT_FRONTEND_PREFIX ) );
	}

	/**
	 * Transform the array to a final HTML string.
	 */
	private static function render_attributes( array $attributes ): string {
		$html = [];
		foreach ( $attributes as $key => $value ) {
			// Key is always secure and doesn't need escaping.
			$html[] = sprintf( '%s="%s"', $key, esc_attr( (string) $value ) );
		}

		return implode( ' ', $html );
	}

	/**
	 * Generates all the standard attributes (classes, ID, styles, data) for an ad item.
	 *
	 * @param Entity $ad      The ad.
	 * @param string $type_id The id of the ad type (e.g. 'html', 'html5').
	 * @param array  $context The render context.
	 *
	 * @return string Final Attribute string (e.g. 'class="..." style="..." data-...')
	 */
	public static function get_standard_item_attributes( Entity $ad, string $type_id, array $context = [] ): string {
		$prefix = self::get_prefix();
		$ad_id  = $ad->get_id();

		// CSS Classes
		$type_class     = sprintf( '%s-type-%s', $prefix, sanitize_html_class( $type_id ) );
		$custom_classes = sanitize_html_class( $ad->get_meta( 'custom_classes', '' ) );

		$css_classes = sprintf(
			'%1$s-item %2$s %1$s-i-%3$d %4$s',
			$prefix,
			$type_class,
			$ad_id,
			$custom_classes
		);

		// Custom ID
		$custom_html_id = $ad->get_meta( 'custom_id', '' );

		// Styles, layout and alignment
		$inline_css      = safecss_filter_attr( $ad->get_meta( 'inline_css', '' ) );
		$alignment       = safecss_filter_attr( $ad->get_layout_styles_string() );
		$style           = trim( $inline_css . $alignment );
		$data_attributes = self::for_item( $ad, $context );

		$attributes = [];
		if ( ! empty( $custom_html_id ) ) {
			$attributes[] = sprintf( 'id="%s"', esc_attr( $custom_html_id ) );
		}

		$attributes[] = sprintf( 'class="%s"', esc_attr( trim( $css_classes ) ) );

		if ( ! empty( $style ) ) {
			$attributes[] = sprintf( 'style="%s"', esc_attr( $style ) );
		}

		return implode( ' ', $attributes ) . ' ' . $data_attributes;
	}
}