<?php

namespace AcademicCrew\Core;

/**
 * Curated font choices offered in Settings → Appearance.
 *
 * A fixed list (rather than a free-text Google Fonts name) keeps the picker
 * simple and avoids having to validate/fetch an arbitrary font at runtime.
 */
class FontRegistry {

    public const DEFAULT_DISPLAY = 'zilla_slab';
    public const DEFAULT_BODY    = 'dm_sans';

    /**
     * @return array<string,array{label:string,stack:string,google:?string}>
     */
    public static function display_fonts(): array {
        return [
            'zilla_slab'       => [
                'label'  => __( 'Zilla Slab (default)', 'academiccrew' ),
                'stack'  => "'Zilla Slab', Georgia, 'Times New Roman', serif",
                'google' => 'Zilla+Slab:wght@400;500;600',
            ],
            'roboto_slab'      => [
                'label'  => __( 'Roboto Slab', 'academiccrew' ),
                'stack'  => "'Roboto Slab', Georgia, serif",
                'google' => 'Roboto+Slab:wght@400;600;700',
            ],
            'playfair_display' => [
                'label'  => __( 'Playfair Display', 'academiccrew' ),
                'stack'  => "'Playfair Display', Georgia, serif",
                'google' => 'Playfair+Display:wght@400;600;700',
            ],
            'merriweather'     => [
                'label'  => __( 'Merriweather', 'academiccrew' ),
                'stack'  => "'Merriweather', Georgia, serif",
                'google' => 'Merriweather:wght@400;700',
            ],
            'system_serif'     => [
                'label'  => __( 'System serif (no web font)', 'academiccrew' ),
                'stack'  => "Georgia, 'Times New Roman', serif",
                'google' => null,
            ],
        ];
    }

    /**
     * @return array<string,array{label:string,stack:string,google:?string}>
     */
    public static function body_fonts(): array {
        return [
            'dm_sans'    => [
                'label'  => __( 'DM Sans (default)', 'academiccrew' ),
                'stack'  => "'DM Sans', system-ui, -apple-system, sans-serif",
                'google' => 'DM+Sans:wght@300;400;500',
            ],
            'inter'      => [
                'label'  => __( 'Inter', 'academiccrew' ),
                'stack'  => "'Inter', system-ui, sans-serif",
                'google' => 'Inter:wght@400;500;600',
            ],
            'roboto'     => [
                'label'  => __( 'Roboto', 'academiccrew' ),
                'stack'  => "'Roboto', system-ui, sans-serif",
                'google' => 'Roboto:wght@400;500;700',
            ],
            'open_sans'  => [
                'label'  => __( 'Open Sans', 'academiccrew' ),
                'stack'  => "'Open Sans', system-ui, sans-serif",
                'google' => 'Open+Sans:wght@400;600;700',
            ],
            'lato'       => [
                'label'  => __( 'Lato', 'academiccrew' ),
                'stack'  => "'Lato', system-ui, sans-serif",
                'google' => 'Lato:wght@400;700',
            ],
            'system_sans' => [
                'label'  => __( 'System sans-serif (no web font)', 'academiccrew' ),
                'stack'  => 'system-ui, -apple-system, sans-serif',
                'google' => null,
            ],
        ];
    }

    public static function display_stack( string $slug ): string {
        $fonts = self::display_fonts();
        return $fonts[ $slug ]['stack'] ?? $fonts[ self::DEFAULT_DISPLAY ]['stack'];
    }

    public static function body_stack( string $slug ): string {
        $fonts = self::body_fonts();
        return $fonts[ $slug ]['stack'] ?? $fonts[ self::DEFAULT_BODY ]['stack'];
    }

    public static function display_google_param( string $slug ): ?string {
        return self::display_fonts()[ $slug ]['google'] ?? null;
    }

    public static function body_google_param( string $slug ): ?string {
        return self::body_fonts()[ $slug ]['google'] ?? null;
    }

    public static function is_valid_display( string $slug ): bool {
        return isset( self::display_fonts()[ $slug ] );
    }

    public static function is_valid_body( string $slug ): bool {
        return isset( self::body_fonts()[ $slug ] );
    }
}