<?php
namespace MazlanHalim\IntelliLanz\Analysis;

/** Stores the latest completed analysis and a bounded summary history in non-autoloaded options. */
final class AnalysisStore {
    private const OPTION = 'intellilanz_latest_analysis_v1';
    private const HISTORY_OPTION = 'intellilanz_analysis_history_v1';
    private const HISTORY_LIMIT = 10;

    public function get(): ?array {
        $value = get_option( self::OPTION, null );
        if ( ! is_array( $value ) || ( $value['schema'] ?? null ) !== 1 || ! is_int( $value['analyzed_at'] ?? null ) ) { return null; }
        if ( ! is_array( $value['graph']['nodes'] ?? null ) || ! is_array( $value['graph']['edges'] ?? null ) || ! is_array( $value['site_health'] ?? null ) || ! is_array( $value['summary'] ?? null ) ) { return null; }
        return $value;
    }

    public function set( array $analysis ): void {
        update_option( self::OPTION, $analysis, false );
    }

    public function pushHistory( array $analysis ): void {
        $history = get_option( self::HISTORY_OPTION, array() );
        if ( ! is_array( $history ) ) { $history = array(); }
        $entry = array( 'analyzed_at' => $analysis['analyzed_at'], 'summary' => $analysis['summary'] );
        $last = end( $history );
        if ( is_array( $last ) && is_array( $last['summary'] ?? null ) && $last['summary'] === $entry['summary'] ) { $history[ count( $history ) - 1 ] = $entry; }
        else { $history[] = $entry; }
        update_option( self::HISTORY_OPTION, array_slice( $history, -self::HISTORY_LIMIT ), false );
    }

    public function getHistory(): array {
        $history = get_option( self::HISTORY_OPTION, array() );
        return is_array( $history ) ? $history : array();
    }
}