<?php
namespace Digiter\BuilderStudio;
defined('ABSPATH') || exit;

/** Explicit bindings to public content; no expressions, arbitrary PHP or private meta. */
final class DynamicData {
    public const SOURCES=['post-title','post-excerpt','post-url','post-date','modified-date','post-id','author-name','site-title','site-description','featured-image','custom-field','row-field'];
    public static function fields(string $type): array {return array_values(array_filter(Document::modules()[$type]['fields'],static fn($f)=>in_array($f['type'],['text','url','image'],true)&&!in_array($f['key'],['metaKey','code','html'],true)));}
    public static function clean($raw,string $type): array {
        if(!is_array($raw)){return [];}$out=[];
        foreach(self::fields($type) as $field){$key=$field['key'];$value=$raw[$key]??null;if(!is_array($value)){continue;}$source=Document::choice($value['source']??'',self::SOURCES,'');if(!$source){continue;}$out[$key]=['source'=>$source,'metaKey'=>Document::text($value['metaKey']??'',80),'fallback'=>Document::text($value['fallback']??'',5000),'before'=>Document::text($value['before']??'',200),'after'=>Document::text($value['after']??'',200)];}return $out;
    }
    public static function public_meta(int $id,string $key,bool $array=false) {
        $post=get_post($id);if(!$post||post_password_required($post)||!preg_match('/^[a-zA-Z][a-zA-Z0-9_-]{0,79}$/D',$key)||is_protected_meta($key,'post')){return '';}
        // Native values stay in protected storage and bypass third-party field adapters.
        if(str_starts_with($key,'digibl_field_')){return NativeFields::public_value($id,$key,$array);}
        $registered=array_merge(get_registered_meta_keys('post'),get_registered_meta_keys('post',$post->post_type));
        $allowed=array_keys(array_filter($registered,static function($m){$rest=$m['show_in_rest']??false;if(!$rest){return false;}$context=is_array($rest)?($rest['schema']['context']??['view']):['view'];return in_array('view',$context,true);}));
        $allowed=apply_filters('digibl_public_dynamic_meta_keys',$allowed,$post->post_type);
        if(!in_array($key,(array)$allowed,true)){return '';}
        $value=get_post_meta($id,$key,true);if($array&&function_exists('get_field')){$acf=get_field($key,$id);if(is_array($acf)){$value=$acf;}}return is_scalar($value)||($array&&is_array($value))?$value:'';
    }
    public static function value(array $binding,int $id,array $row=[]) {
        $post=get_post($id);$source=$binding['source'];if($post&&post_password_required($post)&&!in_array($source,['site-title','site-description'],true)){return '';}
        if($source==='row-field'){$key=$binding['metaKey']??'';return preg_match('/^[a-zA-Z][a-zA-Z0-9_-]{0,79}$/D',$key)&&is_scalar($row[$key]??null)?$row[$key]:'';}
        switch($source){
            case 'site-title':return get_bloginfo('name');
            case 'site-description':return get_bloginfo('description');
            case 'post-title':return $post?get_the_title($post):'';
            case 'post-url':return $post?get_permalink($post):'';
            case 'post-id':return $post?(string)$id:'';
            case 'post-date':return $post?get_the_date('',$post):'';
            case 'modified-date':return $post?get_the_modified_date('',$post):'';
            case 'post-excerpt':return $post?wp_strip_all_tags($post->post_excerpt?:wp_trim_words(strip_shortcodes($post->post_content),28)):'';
            case 'author-name':return $post?get_the_author_meta('display_name',$post->post_author):'';
            case 'featured-image':return $post?(int)get_post_thumbnail_id($id):0;
            case 'custom-field':return self::public_meta($id,$binding['metaKey']??'');
        }return '';
    }
    public static function apply(array $node,int $context,array $row=[]): array {
        foreach(self::fields($node['type']) as $field){$key=$field['key'];$binding=$node['bindings'][$key]??null;if(!$binding){continue;}$value=self::value($binding,$context,$row);if($value===''||$value===null||$value===0){$value=$binding['fallback'];}
            if($field['type']==='image'){$original=$node['props'][$key];$image=is_numeric($value)?['id'=>absint($value)]:['url'=>(string)$value];$node['props'][$key]=Document::image(array_merge($original,['id'=>0,'url'=>''],$image));}
            elseif($field['type']==='url'){$node['props'][$key]=Document::link((string)$value);}
            else{$node['props'][$key]=Document::text($binding['before'].$value.$binding['after'],5000);}
        }return $node;
    }
}