<?php
/**
 * Plugin Name: My Network Settings
 * Description: Settings page for network admin and all sub-sites
 * Network: true
 */

class My_Network_Settings {

    private static $option_key = 'my_network_options';

    public function __construct() {
        // Network Admin menu (yourdomain.com/wp-admin/network/)
        add_action( 'network_admin_menu', [ $this, 'add_network_settings_page' ] );

        // Sub-site Admin menu (yourdomain.com/site1/wp-admin/)
        add_action( 'admin_menu', [ $this, 'add_site_settings_page' ] );

        // Handle saves separately for each context
        add_action( 'network_admin_edit_my_network_settings', [ $this, 'save_network_settings' ] );
        add_action( 'admin_post_my_site_settings', [ $this, 'save_site_settings' ] );
    }

    // ─── NETWORK ADMIN ───────────────────────────────────────────

    public function add_network_settings_page() {
        add_submenu_page(
            'settings.php',                  // Parent: Network Settings
            'My Network Settings',
            'My Network Settings',
            'manage_network_options',        // Network admin capability
            'my-network-settings',
            [ $this, 'render_network_page' ]
        );
    }

    public function render_network_page() {
        $options = get_site_option( $option_key, [] );  // Network-wide option
        ?>
        <div class="wrap">
            <h1>My Network Settings</h1>
            <?php if ( isset( $_GET['updated'] ) ) : ?>
                <div class="notice notice-success"><p>Network settings saved.</p></div>
            <?php endif; ?>
            <form method="POST" action="edit.php?action=my_network_settings">
                <?php wp_nonce_field( 'my_network_settings_nonce' ); ?>
                <table class="form-table">
                    <tr>
                        <th>Network API Key</th>
                        <td>
                            <input type="text" name="api_key"
                                value="<?php echo esc_attr( $options['api_key'] ?? '' ); ?>"
                                class="regular-text" />
                        </td>
                    </tr>
                    <tr>
                        <th>Enable Feature</th>
                        <td>
                            <label>
                                <input type="checkbox" name="enable_feature" value="1"
                                    <?php checked( $options['enable_feature'] ?? false ); ?> />
                                Enable across all sites
                            </label>
                        </td>
                    </tr>
                </table>
                <?php submit_button( 'Save Network Settings' ); ?>
            </form>
        </div>
        <?php
    }

    public function save_network_settings() {
        check_admin_referer( 'my_network_settings_nonce' );

        if ( ! current_user_can( 'manage_network_options' ) ) {
            wp_die( 'Unauthorized' );
        }

        $options = [
            'api_key'        => sanitize_text_field( $_POST['api_key'] ?? '' ),
            'enable_feature' => isset( $_POST['enable_feature'] ) ? 1 : 0,
        ];

        update_site_option( self::$option_key, $options );  // Saves to network

        // Redirect back with success message
        wp_redirect( add_query_arg( [
            'page'    => 'my-network-settings',
            'updated' => 'true',
        ], network_admin_url( 'settings.php' ) ) );
        exit;
    }

    // ─── SUB-SITE ADMIN ──────────────────────────────────────────

    public function add_site_settings_page() {
        add_options_page(
            'My Site Settings',
            'My Site Settings',
            'manage_options',               // Regular admin capability
            'my-site-settings',
            [ $this, 'render_site_page' ]
        );
    }

    public function render_site_page() {
        // Pull network-wide options + per-site overrides
        $network_options = get_site_option( self::$option_key, [] );
        $site_options    = get_option( 'my_site_options', [] );
        ?>
        <div class="wrap">
            <h1>My Site Settings</h1>

            <!-- Show inherited network value (read-only) -->
            <h2>Inherited from Network</h2>
            <table class="form-table">
                <tr>
                    <th>Network Feature Enabled</th>
                    <td>
                        <?php echo ! empty( $network_options['enable_feature'] ) ? '✅ Yes' : '❌ No'; ?>
                        <p class="description">Controlled by the Network Admin.</p>
                    </td>
                </tr>
            </table>

            <!-- Per-site overrides -->
            <h2>Site-Specific Settings</h2>
            <?php if ( isset( $_GET['updated'] ) ) : ?>
                <div class="notice notice-success"><p>Site settings saved.</p></div>
            <?php endif; ?>
            <form method="POST" action="admin-post.php">
                <?php wp_nonce_field( 'my_site_settings_nonce' ); ?>
                <input type="hidden" name="action" value="my_site_settings" />
                <table class="form-table">
                    <tr>
                        <th>Site Display Name</th>
                        <td>
                            <input type="text" name="display_name"
                                value="<?php echo esc_attr( $site_options['display_name'] ?? '' ); ?>"
                                class="regular-text" />
                        </td>
                    </tr>
                    <tr>
                        <th>Custom Color</th>
                        <td>
                            <input type="color" name="brand_color"
                                value="<?php echo esc_attr( $site_options['brand_color'] ?? '#000000' ); ?>" />
                        </td>
                    </tr>
                </table>
                <?php submit_button( 'Save Site Settings' ); ?>
            </form>
        </div>
        <?php
    }

    public function save_site_settings() {
        check_admin_referer( 'my_site_settings_nonce' );

        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( 'Unauthorized' );
        }

        $options = [
            'display_name' => sanitize_text_field( $_POST['display_name'] ?? '' ),
            'brand_color'  => sanitize_hex_color( $_POST['brand_color'] ?? '#000000' ),
        ];

        update_option( 'my_site_options', $options );  // Saves to current site only

        wp_redirect( add_query_arg( [
            'page'    => 'my-site-settings',
            'updated' => 'true',
        ], admin_url( 'options-general.php' ) ) );
        exit;
    }
}

new My_Network_Settings();