<?php
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * WBF_Levels — Post-Count-basiertes Level-System
 * Levels werden in wp_options gespeichert und können im Admin verwaltet werden.
 * Das System kann global aktiviert/deaktiviert werden.
 */
class WBF_Levels {

    const OPTION_KEY  = 'wbf_level_config';
    const ENABLED_KEY = 'wbf_levels_enabled';

    // ── An/Aus ────────────────────────────────────────────────────

    public static function is_enabled() {
        return (bool) get_option( self::ENABLED_KEY, true );
    }

    public static function set_enabled( $bool ) {
        update_option( self::ENABLED_KEY, (bool) $bool );
    }

    // ── Standard-Level beim ersten Aktivieren ────────────────────

    private static function default_levels() {
        return [
            [ 'min' => 0,    'label' => 'Neuling',      'icon' => 'fas fa-seedling',      'color' => '#94a3b8' ],
            [ 'min' => 10,   'label' => 'Schreiberling', 'icon' => 'fas fa-feather',       'color' => '#60a5fa' ],
            [ 'min' => 50,   'label' => 'Erfahrener',   'icon' => 'fas fa-fire',          'color' => '#f97316' ],
            [ 'min' => 150,  'label' => 'Veteran',      'icon' => 'fas fa-shield-halved', 'color' => '#a78bfa' ],
            [ 'min' => 500,  'label' => 'Legende',      'icon' => 'fas fa-crown',         'color' => '#fbbf24' ],
        ];
    }

    // ── Laden / Speichern ─────────────────────────────────────────

    public static function get_all() {
        $saved = get_option( self::OPTION_KEY, null );
        if ( $saved === null ) {
            $defaults = self::default_levels();
            update_option( self::OPTION_KEY, $defaults );
            return $defaults;
        }
        $levels = (array) $saved;
        usort( $levels, fn($a,$b) => (int)$a['min'] <=> (int)$b['min'] );
        return $levels;
    }

    public static function save( $levels ) {
        usort( $levels, fn($a,$b) => (int)$a['min'] <=> (int)$b['min'] );
        update_option( self::OPTION_KEY, $levels );
    }

    public static function reset_to_defaults() {
        update_option( self::OPTION_KEY, self::default_levels() );
    }

    // ── Level für eine Beitragsanzahl ermitteln ───────────────────

    public static function get_for_count( $post_count ) {
        $levels = self::get_all();
        // Von oben (höchster min) nach unten suchen
        $sorted = array_reverse( $levels );
        foreach ( $sorted as $level ) {
            if ( (int) $post_count >= (int) $level['min'] ) {
                return $level;
            }
        }
        return $levels[0]; // Fallback: niedrigstes Level
    }

    // Nächstes Level (für Fortschrittsanzeige)
    public static function get_next( $post_count ) {
        $levels = self::get_all(); // bereits aufsteigend sortiert
        foreach ( $levels as $level ) {
            if ( (int) $level['min'] > (int) $post_count ) {
                return $level;
            }
        }
        return null; // Maxlevel erreicht
    }

    // Fortschritt in Prozent zum nächsten Level (0–100)
    public static function progress( $post_count ) {
        $current = self::get_for_count( $post_count );
        $next    = self::get_next( $post_count );
        if ( ! $next ) return 100;
        $range = (int) $next['min'] - (int) $current['min'];
        if ( $range <= 0 ) return 100;
        $done = (int) $post_count - (int) $current['min'];
        return min( 100, (int) round( $done / $range * 100 ) );
    }

    // ── Badge HTML ────────────────────────────────────────────────

    public static function badge( $post_count ) {
        if ( ! self::is_enabled() ) return '';
        $level = self::get_for_count( $post_count );
        $label = esc_html( $level['label'] );
        $icon  = esc_attr( $level['icon'] );
        $color = esc_attr( $level['color'] );
        return "<span class=\"wbf-level-badge\" style=\"--lc:{$color}\">"
             . "<i class=\"{$icon}\"></i> {$label}</span>";
    }

    // ── Fortschrittsbalken HTML (für Profil-Sidebar) ──────────────

    public static function progress_bar( $post_count ) {
        if ( ! self::is_enabled() ) return '';
        $current  = self::get_for_count( $post_count );
        $next     = self::get_next( $post_count );
        $pct      = self::progress( $post_count );
        $color    = esc_attr( $current['color'] );
        $cur_lbl  = esc_html( $current['label'] );
        $next_lbl = $next ? esc_html( $next['label'] ) : $cur_lbl;
        $posts_to = $next ? ( (int)$next['min'] - (int)$post_count ) . ' Beiträge bis ' . $next_lbl : 'Maximales Level erreicht';

        return "
        <div class=\"wbf-level-progress\">
            <div class=\"wbf-level-progress__labels\">
                <span style=\"color:{$color}\">" . self::badge( $post_count ) . "</span>
                <span class=\"wbf-level-progress__hint\">{$posts_to}</span>
            </div>
            <div class=\"wbf-level-progress__bar\">
                <div class=\"wbf-level-progress__fill\" style=\"width:{$pct}%;background:{$color}\"></div>
            </div>
        </div>";
    }
}