<?php
/**
 * Plugin Name: Tutor LMS Custom Dashboard Button
 * Plugin URI:  https://sacre-savoir.com
 * Description: Adds a customizable button to the Tutor LMS dashboard for ALL users (students, instructors, admins). Configure text, color and link from WP Admin > Settings > Tutor Dashboard Button.
 * Version:     2.0.0
 * Author:      Sabbir
 * License:     GPL2
 * Text Domain: tutor-custom-btn
 */

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

// ═══════════════════════════════════════════════════════
// 1. ADMIN SETTINGS PAGE
// ═══════════════════════════════════════════════════════

add_action( 'admin_menu', 'tcb_add_admin_menu' );
function tcb_add_admin_menu() {
    add_options_page(
        'Tutor Dashboard Button',
        'Tutor Dashboard Button',
        'manage_options',
        'tutor-custom-button',
        'tcb_settings_page_html'
    );
}

add_action( 'admin_init', 'tcb_register_settings' );
function tcb_register_settings() {
    register_setting( 'tcb_group', 'tcb_text',       [ 'sanitize_callback' => 'sanitize_text_field', 'default' => 'Click Here' ] );
    register_setting( 'tcb_group', 'tcb_url',        [ 'sanitize_callback' => 'esc_url_raw',         'default' => '' ] );
    register_setting( 'tcb_group', 'tcb_text_color', [ 'sanitize_callback' => 'sanitize_hex_color',  'default' => '#ffffff' ] );
    register_setting( 'tcb_group', 'tcb_bg_color',   [ 'sanitize_callback' => 'sanitize_hex_color',  'default' => '#1d2a7a' ] );
    register_setting( 'tcb_group', 'tcb_enabled',    [ 'sanitize_callback' => 'absint',              'default' => 1 ] );
    register_setting( 'tcb_group', 'tcb_position',   [ 'sanitize_callback' => 'sanitize_text_field', 'default' => 'before_profile' ] );
}

function tcb_settings_page_html() {
    if ( ! current_user_can( 'manage_options' ) ) return;

    $text       = get_option( 'tcb_text',       'Click Here' );
    $url        = get_option( 'tcb_url',        '' );
    $tc         = get_option( 'tcb_text_color', '#ffffff' );
    $bg         = get_option( 'tcb_bg_color',   '#1d2a7a' );
    $enabled    = get_option( 'tcb_enabled',    1 );
    $position   = get_option( 'tcb_position',   'before_profile' );
    ?>
    <div class="wrap">
        <h1>🎓 Tutor LMS — Dashboard Button Settings</h1>
        <p style="color:#555">The button will appear automatically on the Tutor LMS dashboard for every user (student, instructor, admin).</p>

        <?php if ( isset( $_GET['settings-updated'] ) ) : ?>
            <div class="notice notice-success is-dismissible"><p><strong>✅ Settings saved!</strong></p></div>
        <?php endif; ?>

        <div style="display:grid;grid-template-columns:1fr 300px;gap:30px;max-width:900px">
            <div>
                <form method="post" action="options.php">
                    <?php settings_fields( 'tcb_group' ); ?>
                    <table class="form-table">

                        <tr>
                            <th>Enable Button</th>
                            <td>
                                <label class="tcb-toggle">
                                    <input type="checkbox" name="tcb_enabled" value="1" <?php checked(1,$enabled); ?>>
                                    <span class="tcb-slider"></span>
                                </label>
                            </td>
                        </tr>

                        <tr>
                            <th><label for="tcb_text">Button Text</label></th>
                            <td>
                                <input type="text" id="tcb_text" name="tcb_text" value="<?php echo esc_attr($text); ?>" class="regular-text" placeholder="e.g. Visit Our Site">
                            </td>
                        </tr>

                        <tr>
                            <th><label for="tcb_url">Button URL</label></th>
                            <td>
                                <input type="url" id="tcb_url" name="tcb_url" value="<?php echo esc_attr($url); ?>" class="regular-text" placeholder="https://example.com">
                                <p class="description">Opens in a new tab automatically.</p>
                            </td>
                        </tr>

                        <tr>
                            <th><label for="tcb_text_color">Text Color</label></th>
                            <td style="display:flex;align-items:center;gap:10px;padding-top:12px">
                                <input type="color" id="tcb_text_color" name="tcb_text_color" value="<?php echo esc_attr($tc); ?>" class="tcb-cp">
                                <input type="text" id="tcb_text_color_hex" class="tcb-hex" value="<?php echo esc_attr($tc); ?>" maxlength="7">
                            </td>
                        </tr>

                        <tr>
                            <th><label for="tcb_bg_color">Background Color</label></th>
                            <td style="display:flex;align-items:center;gap:10px;padding-top:12px">
                                <input type="color" id="tcb_bg_color" name="tcb_bg_color" value="<?php echo esc_attr($bg); ?>" class="tcb-cp">
                                <input type="text" id="tcb_bg_color_hex" class="tcb-hex" value="<?php echo esc_attr($bg); ?>" maxlength="7">
                            </td>
                        </tr>

                        <tr>
                            <th><label for="tcb_position">Button Position</label></th>
                            <td>
                                <select id="tcb_position" name="tcb_position">
                                    <option value="before_profile" <?php selected($position,'before_profile'); ?>>Above "Complete Your Profile"</option>
                                    <option value="after_profile"  <?php selected($position,'after_profile');  ?>>Below "Complete Your Profile"</option>
                                    <option value="before_stats"   <?php selected($position,'before_stats');   ?>>Above Stats Cards (Enrolled / Active …)</option>
                                    <option value="after_stats"    <?php selected($position,'after_stats');    ?>>Below Stats Cards</option>
                                </select>
                            </td>
                        </tr>

                    </table>
                    <?php submit_button('Save Settings'); ?>
                </form>
            </div>

            <!-- Live Preview -->
            <div>
                <div style="position:sticky;top:32px;background:#f6f7f8;border:1px solid #ddd;border-radius:8px;padding:24px;text-align:center">
                    <p style="margin:0 0 14px;font-size:12px;text-transform:uppercase;color:#888;letter-spacing:.5px">Live Preview</p>
                    <a id="tcb-preview" href="#"
                       style="display:inline-block;padding:11px 26px;border-radius:6px;font-weight:700;font-size:15px;text-decoration:none;box-shadow:0 2px 8px rgba(0,0,0,.15);transition:opacity .2s;
                              color:<?php echo esc_attr($tc); ?>;background:<?php echo esc_attr($bg); ?>">
                        <?php echo esc_html($text); ?>
                    </a>
                    <p style="font-size:11px;color:#aaa;margin:12px 0 0">Updates as you type</p>
                </div>
            </div>
        </div>
    </div>

    <style>
        .tcb-toggle{position:relative;display:inline-block;width:52px;height:28px}
        .tcb-toggle input{opacity:0;width:0;height:0}
        .tcb-slider{position:absolute;cursor:pointer;inset:0;background:#ccc;border-radius:28px;transition:.3s}
        .tcb-slider:before{content:"";position:absolute;height:20px;width:20px;left:4px;bottom:4px;background:#fff;border-radius:50%;transition:.3s}
        .tcb-toggle input:checked+.tcb-slider{background:#1d72b8}
        .tcb-toggle input:checked+.tcb-slider:before{transform:translateX(24px)}
        .tcb-cp{width:46px;height:36px;border:1px solid #ddd;border-radius:4px;cursor:pointer;padding:2px}
        .tcb-hex{width:80px;font-family:monospace}
    </style>

    <script>
    (function(){
        var prev = document.getElementById('tcb-preview');
        function pair(cpId, hexId, prop){
            var cp  = document.getElementById(cpId);
            var hex = document.getElementById(hexId);
            cp.addEventListener('input',function(){ hex.value=cp.value; prev.style[prop]=cp.value; });
            hex.addEventListener('input',function(){
                if(/^#[0-9a-fA-F]{6}$/.test(hex.value)){ cp.value=hex.value; prev.style[prop]=hex.value; }
            });
        }
        pair('tcb_text_color','tcb_text_color_hex','color');
        pair('tcb_bg_color','tcb_bg_color_hex','backgroundColor');
        document.getElementById('tcb_text').addEventListener('input',function(){ prev.textContent=this.value||'Button'; });
        document.getElementById('tcb_url').addEventListener('input',function(){ prev.href=this.value; });
    })();
    </script>
    <?php
}


// ═══════════════════════════════════════════════════════
// 2. OUTPUT THE BUTTON ON THE FRONTEND
//    Strategy: Try every known Tutor LMS action hook.
//    If none fires, JavaScript DOM injection is the
//    guaranteed fallback – it runs on every page load.
// ═══════════════════════════════════════════════════════

// ── 2a. All known Tutor LMS PHP action hooks ──────────
$tcb_hooks = [
    'tutor_dashboard/before_dashboard_content',
    'tutor_after_dashboard_top_banner',
    'tutor_dashboard_content_before',
    'tutor_dashboard_before',
    'tutor/dashboard/before',
    'tutor_student_dashboard_before',
];
foreach ( $tcb_hooks as $hook ) {
    add_action( $hook, 'tcb_render_button_php', 5 );
}

function tcb_render_button_php() {
    static $done = false;
    if ( $done ) return;
    $done = true;
    echo tcb_button_html();
}

// ── 2b. Shortcode [tutor_dashboard_button] ────────────
add_shortcode( 'tutor_dashboard_button', 'tcb_button_html' );

// ── 2c. HTML helper ───────────────────────────────────
function tcb_button_html() {
    if ( ! get_option('tcb_enabled', 1) ) return '';
    $text = get_option('tcb_text',       'Click Here');
    $url  = get_option('tcb_url',        '');
    $tc   = get_option('tcb_text_color', '#ffffff');
    $bg   = get_option('tcb_bg_color',   '#1d2a7a');
    if ( empty($url) ) return '';

    return sprintf(
        '<div class="tcb-wrap"><a href="%s" target="_blank" rel="noopener noreferrer" class="tcb-btn" style="color:%s;background:%s">%s</a></div>',
        esc_url($url), esc_attr($tc), esc_attr($bg), esc_html($text)
    );
}

// ═══════════════════════════════════════════════════════
// 3. JAVASCRIPT DOM INJECTION — GUARANTEED FALLBACK
//    Runs on every page that contains the Tutor dashboard.
//    Reads button config via wp_localize_script so no
//    inline PHP is needed in the JS.
// ═══════════════════════════════════════════════════════

add_action( 'wp_enqueue_scripts', 'tcb_enqueue' );
function tcb_enqueue() {
    if ( ! get_option('tcb_enabled', 1) ) return;
    if ( ! function_exists('tutor') )      return;

    $url = get_option('tcb_url', '');
    if ( empty($url) ) return;

    // Inline script — no external file needed
    $config = [
        'text'      => get_option('tcb_text',       'Click Here'),
        'url'       => $url,
        'textColor' => get_option('tcb_text_color', '#ffffff'),
        'bgColor'   => get_option('tcb_bg_color',   '#1d2a7a'),
        'position'  => get_option('tcb_position',   'before_profile'),
    ];

    wp_register_script( 'tcb-inject', false, [], false, true );
    wp_enqueue_script(  'tcb-inject' );
    wp_add_inline_script( 'tcb-inject', 'var TCB = ' . wp_json_encode($config) . ';' );

    wp_add_inline_script( 'tcb-inject', "
(function(){
    function tcbInject(){
        /* Already injected? Skip. */
        if(document.getElementById('tcb-dashboard-btn')) return;

        /* ── Selectors that wrap the Tutor dashboard content ── */
        var anchors = [
            '.tutor-dashboard-content-wrap',
            '.tutor-dashboard-content',
            '.tutor-dashboard .tutor-col-8',
            '.tutor-dashboard .tutor-col-9',
            '[class*=\"tutor-dashboard\"] .tutor-col',
            '.dashboard-content-area',
            '.tutor-student-dashboard',
            '#tutor-dashboard-content'
        ];

        var container = null;
        for(var i=0;i<anchors.length;i++){
            container = document.querySelector(anchors[i]);
            if(container) break;
        }
        if(!container) return; /* Not a dashboard page */

        /* ── Build the button ── */
        var wrap = document.createElement('div');
        wrap.id  = 'tcb-dashboard-btn';
        wrap.className = 'tcb-wrap';

        var a = document.createElement('a');
        a.href    = TCB.url;
        a.target  = '_blank';
        a.rel     = 'noopener noreferrer';
        a.className = 'tcb-btn';
        a.style.color      = TCB.textColor;
        a.style.background = TCB.bgColor;
        a.textContent      = TCB.text;

        wrap.appendChild(a);

        /* ── Choose insertion point based on position setting ── */
        var pos = TCB.position;
        var profileBox = container.querySelector('.tutor-dashboard-permalink, .complete-profile-box, [class*=\"complete\"][class*=\"profile\"], .tutor-card');
        var statsRow   = container.querySelector('.tutor-dashboard-group, .tutor-row:has(.tutor-dashboard-permalinks), .tutor-stats-wrap, .tutor-dashboard-stats');

        if(pos === 'before_profile' || pos === 'before_stats'){
            /* Insert as very first child of dashboard content */
            container.insertBefore(wrap, container.firstChild);
        } else if(pos === 'after_profile' && profileBox){
            profileBox.parentNode.insertBefore(wrap, profileBox.nextSibling);
        } else if(pos === 'after_stats' && statsRow){
            statsRow.parentNode.insertBefore(wrap, statsRow.nextSibling);
        } else {
            /* Default: prepend */
            container.insertBefore(wrap, container.firstChild);
        }
    }

    /* Run after DOM ready */
    if(document.readyState === 'loading'){
        document.addEventListener('DOMContentLoaded', tcbInject);
    } else {
        tcbInject();
    }
    /* Also try after full page load (handles lazy-rendered dashboards) */
    window.addEventListener('load', tcbInject);
})();
" );
}


// ═══════════════════════════════════════════════════════
// 4. FRONT-END CSS
// ═══════════════════════════════════════════════════════

add_action( 'wp_head', 'tcb_styles' );
function tcb_styles(){
    if ( ! get_option('tcb_enabled',1) ) return;
    if ( ! function_exists('tutor') )    return;
    ?>
    <style id="tcb-css">
        .tcb-wrap{
            display:flex;
            justify-content:flex-end;
            margin-bottom:18px;
        }
        a.tcb-btn{
            display:inline-block;
            padding:11px 28px;
            border-radius:6px;
            font-size:15px;
            font-weight:700;
            text-decoration:none !important;
            cursor:pointer;
            box-shadow:0 2px 10px rgba(0,0,0,.15);
            transition:opacity .2s, transform .15s;
        }
        a.tcb-btn:hover{
            opacity:.85;
            transform:translateY(-1px);
        }
    </style>
    <?php
}


// ═══════════════════════════════════════════════════════
// 5. QUICK SETTINGS LINK IN PLUGINS LIST
// ═══════════════════════════════════════════════════════

add_filter( 'plugin_action_links_' . plugin_basename(__FILE__), function($links){
    $links[] = '<a href="'.admin_url('options-general.php?page=tutor-custom-button').'">Settings</a>';
    return $links;
});