<?php

defined( 'ABSPATH' ) || exit;

class AIEO_SEO_Fixer {

	
	const SOURCE          = 'aieo_autofix';
	const AUTOPILOT_OPTION = 'seo.autofix_deterministic';

	
	const SAFE_AUTO     = array( 'canonical', 'keyphrase' );
	const EXPLICIT_ONLY = array( 'indexable' );

	
	public static function types() {
		return array(
			'canonical' => __( 'Set the canonical URL', 'ai-eshop-optimizer' ),
			'keyphrase' => __( 'Set the focus keyphrase from the page’s top ranked Google keyword', 'ai-eshop-optimizer' ),
			'indexable' => __( 'Make the page indexable (clear an explicit noindex)', 'ai-eshop-optimizer' ),
		);
	}

	
	public static function applicable( $object_type, $object_id ) {
		$out = array();
		$row = class_exists( 'AIEO_SEO_Store' ) ? (array) AIEO_SEO_Store::get( $object_type, $object_id ) : array();

		$has_canon = ( '' !== trim( (string) ( $row['canonical_url'] ?? '' ) ) )
			|| ( '' !== trim( (string) ( $row['canonical_override'] ?? '' ) ) );
		if ( ! $has_canon ) {
			$out[] = 'canonical';
		}

		if ( '' === trim( (string) ( $row['focus_keyphrase'] ?? '' ) ) && '' !== self::top_keyword( $object_type, $object_id ) ) {
			$out[] = 'keyphrase';
		}

		
		
		
		if ( ! empty( $row['robots_noindex'] ) && isset( $row['robots_default'] ) && ! $row['robots_default'] ) {
			$out[] = 'indexable';
		}
		return $out;
	}

	
	public static function apply( $object_type, $object_id, array $fixes = array() ) {
		$applicable = self::applicable( $object_type, $object_id );
		
		
		$fixes = empty( $fixes )
			? array_values( array_intersect( $applicable, self::SAFE_AUTO ) )
			: array_values( array_intersect( $fixes, $applicable ) );

		$applied = array();
		$before  = array();

		foreach ( $fixes as $fix ) {
			switch ( $fix ) {
				case 'canonical':
					if ( class_exists( 'AIEO_SEO_Head_Builder' ) && method_exists( 'AIEO_SEO_Head_Builder', 'build' ) ) {
						AIEO_SEO_Head_Builder::build( $object_type, $object_id ); 
						$applied[] = 'canonical';
					}
					break;

				case 'keyphrase':
					$kw = self::top_keyword( $object_type, $object_id );
					if ( '' !== $kw && class_exists( 'AIEO_SEO_Store' ) ) {
						$before['keyphrase'] = ''; 
						AIEO_SEO_Store::save( $object_type, $object_id, array(
							'focus_keyphrase'        => $kw,
							'focus_keyphrase_source' => self::SOURCE,
						) );
						$applied[] = 'keyphrase';
					}
					break;

				case 'indexable':
					
					
					
					if ( class_exists( 'AIEO_SEO_Store' ) ) {
						AIEO_SEO_Store::save( $object_type, $object_id, array( 'robots_noindex' => 0 ) );
						$applied[] = 'indexable';
					}
					break;
			}
		}

		$score = array();
		if ( ! empty( $applied ) && class_exists( 'AIEO_SEO_Score' ) && method_exists( 'AIEO_SEO_Score', 'build' ) ) {
			$score = (array) AIEO_SEO_Score::build( $object_type, $object_id ); 
		}

		return array(
			'object_type' => (string) $object_type,
			'object_id'   => (int) $object_id,
			'applied'     => $applied,
			'before'      => $before,
			'fix_count'   => isset( $score['fix_count'] ) ? (int) $score['fix_count'] : null,
			'seo_score'   => isset( $score['score'] ) ? (int) $score['score'] : null,
		);
	}

	
	public static function undo( $object_type, $object_id ) {
		$done = array();
		$row  = class_exists( 'AIEO_SEO_Store' ) ? (array) AIEO_SEO_Store::get( $object_type, $object_id ) : array();

		if ( self::SOURCE === (string) ( $row['focus_keyphrase_source'] ?? '' ) ) {
			AIEO_SEO_Store::save( $object_type, $object_id, array(
				'focus_keyphrase'        => '',
				'focus_keyphrase_source' => null,
			) );
			$done[] = 'keyphrase';
		}

		if ( ! empty( $done ) && class_exists( 'AIEO_SEO_Score' ) && method_exists( 'AIEO_SEO_Score', 'build' ) ) {
			AIEO_SEO_Score::build( $object_type, $object_id );
		}
		return $done;
	}

	
	public static function run_autopilot( $limit = 200 ) {
		if ( ! self::autopilot_on() ) {
			return array( 'enabled' => false, 'scanned' => 0, 'pages_fixed' => 0, 'fixes_applied' => 0 );
		}
		global $wpdb;
		$sc = $wpdb->prefix . 'aieo_seo_scores';
		
		$rows = $wpdb->get_results( $wpdb->prepare(
			"SELECT s.object_type, s.object_id
			 FROM `{$sc}` s
			 INNER JOIN {$wpdb->posts} wp ON wp.ID = s.object_id AND wp.post_type = s.object_type
			 WHERE wp.post_status = 'publish' AND s.fix_count > 0
			 ORDER BY s.fix_count DESC
			 LIMIT %d",
			(int) $limit
		), ARRAY_A );

		$pages = 0; $fixes = 0;
		foreach ( (array) $rows as $r ) {
			$res = self::apply( (string) $r['object_type'], (int) $r['object_id'] );
			if ( ! empty( $res['applied'] ) ) {
				$pages++;
				$fixes += count( $res['applied'] );
			}
		}
		return array( 'enabled' => true, 'scanned' => count( (array) $rows ), 'pages_fixed' => $pages, 'fixes_applied' => $fixes );
	}

	public static function autopilot_on() {
		return class_exists( 'AIEO_DMM_Settings' ) && (bool) AIEO_DMM_Settings::get( self::AUTOPILOT_OPTION, false );
	}

	

	private static function top_keyword( $object_type, $object_id ) {
		if ( ! class_exists( 'AIEO_DFS_Rankings' ) || ! method_exists( 'AIEO_DFS_Rankings', 'keywords_for' ) ) {
			return '';
		}
		$k = AIEO_DFS_Rankings::keywords_for( $object_type, $object_id, 1 );
		return isset( $k[0]['keyword'] ) ? trim( (string) $k[0]['keyword'] ) : '';
	}
}