<?php
/**
 * Plugin Name: CTMS Teacher Dashboard Customizer
 * Description: Customizes Tutor LMS dashboard sidebar for Teacher accounts per Nuguna VR manual section 12.
 */

if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * 1. Register custom page keys in the full nav_items_all so Tutor's
 *    Rewrite_Rules class generates /dashboard/my-students/ etc. routes.
 */
add_filter( 'tutor_dashboard/nav_items_all', 'ctms_register_teacher_pages', 5 );

function ctms_register_teacher_pages( $items ) {
    $items['my-students'] = array(
        'title' => __( 'My Students', 'tutor' ),
        'icon'  => 'tutor-icon-user-graduate',
    );
    $items['my-class'] = array(
        'title' => __( 'My Class', 'tutor' ),
        'icon'  => 'tutor-icon-rocket',
    );
    $items['analytics'] = array(
        'title' => __( 'Analytics', 'tutor' ),
        'icon'  => 'tutor-icon-chart-pie',
    );
    return $items;
}

/**
 * 2a. Student sidebar – 4 items (non-instructors).
 */
add_filter( 'tutor_dashboard/nav_ui_items', 'ctms_student_sidebar_items', 999 );

function ctms_student_sidebar_items( $items ) {
    if ( ! is_user_logged_in() || ! function_exists( 'tutor' ) ) {
        return $items;
    }
    if ( current_user_can( tutor()->instructor_role ) ) {
        return $items; // handled by teacher filter below
    }
    return array(
        'index'      => array( 'title' => __( 'Dashboard',  'tutor' ), 'icon' => 'tutor-icon-dashboard' ),
        'my-profile' => array( 'title' => __( 'My Profile', 'tutor' ), 'icon' => 'tutor-icon-user-bold' ),
        'my-class'   => array( 'title' => __( 'My Class',   'tutor' ), 'icon' => 'tutor-icon-rocket' ),
        'analytics'  => array( 'title' => __( 'Analytics',  'tutor' ), 'icon' => 'tutor-icon-chart-pie' ),
        'logout'     => array( 'title' => __( 'Logout',     'tutor' ), 'icon' => 'tutor-icon-signout' ),
    );
}

/**
 * 2b. Replace the sidebar nav with exactly the 6 required items for instructors.
 *    Priority 999 so it runs after all other filters.
 */
add_filter( 'tutor_dashboard/nav_ui_items', 'ctms_teacher_sidebar_items', 999 );

function ctms_teacher_sidebar_items( $items ) {
    if ( ! is_user_logged_in() || ! function_exists( 'tutor' ) ) {
        return $items;
    }

    if ( ! current_user_can( tutor()->instructor_role ) ) {
        return $items;
    }

    return array(
        'index'       => array(
            'title' => __( 'Dashboard', 'tutor' ),
            'icon'  => 'tutor-icon-dashboard',
        ),
        'my-profile'  => array(
            'title' => __( 'My Profile', 'tutor' ),
            'icon'  => 'tutor-icon-user-bold',
        ),
        'my-students' => array(
            'title' => __( 'My Students', 'tutor' ),
            'icon'  => 'tutor-icon-user-graduate',
        ),
        'my-class'    => array(
            'title' => __( 'My Class', 'tutor' ),
            'icon'  => 'tutor-icon-rocket',
        ),
        'analytics'   => array(
            'title' => __( 'Analytics', 'tutor' ),
            'icon'  => 'tutor-icon-chart-pie',
        ),
        'logout'      => array(
            'title' => __( 'Logout', 'tutor' ),
            'icon'  => 'tutor-icon-signout',
        ),
    );
}

/**
 * 3. Register the Billing settings sub-page so Tutor generates its rewrite rule.
 */
add_filter( 'tutor_dashboard/nav_items/settings/nav_items', 'ctms_register_billing_settings_tab' );

function ctms_register_billing_settings_tab( $items ) {
    if ( is_user_logged_in() && function_exists( 'tutor' ) && ! current_user_can( tutor()->instructor_role ) ) {
        $items['billing'] = array(
            'title' => __( 'Billing', 'tutor' ),
            'url'   => tutor_utils()->get_tutor_dashboard_page_permalink( 'settings/billing' ),
        );
    }
    return $items;
}

/**
 * 4. Flush rewrite rules once when this plugin is first loaded
 *    (only if the custom rules are not yet registered).
 */
add_action( 'init', 'ctms_maybe_flush_rewrite_rules', 99 );

function ctms_maybe_flush_rewrite_rules() {
    if ( get_option( 'ctms_teacher_rules_flushed' ) !== '1' ) {
        flush_rewrite_rules( false );
        update_option( 'ctms_teacher_rules_flushed', '1' );
    }
}