return '<p>' . __('Tidak ada jadwal acara untuk ditampilkan.', 'radio-schedule') . '</p>';
        }
        
        $current_program = $show_current ? $this->get_current_schedule() : null;
        $next_program = $show_current ? $this->get_next_program() : null;
        
        ob_start();
        include RADIO_SCHEDULE_PLUGIN_PATH . 'templates/timetable-display.php';
        return ob_get_clean();
    }
    
    public function timetable_shortcode($atts) {
        $atts = shortcode_atts(array(
            'days' => 7,
            'show_current' => 'yes',
            'start_hour' => 4,
            'end_hour' => 24,
            'style' => 'modern'
        ), $atts, 'radio_timetable');
        
        // Validasi jam
        $start_hour = intval($atts['start_hour']);
        $end_hour = intval($atts['end_hour']);
        
        // Pastikan jam valid (0-23)
        $start_hour = max(0, min(23, $start_hour));
        $end_hour = max(0, min(23, $end_hour));
        
        // Jika start hour lebih besar dari end hour, swap
        if ($start_hour > $end_hour) {
            $temp = $start_hour;
            $start_hour = $end_hour;
            $end_hour = $temp;
        }
        
        return $this->display_timetable(
            absint($atts['days']), 
            $atts['show_current'] === 'yes',
            $start_hour,
            $end_hour
        );
    }
    
    private function get_weekly_schedule_for_timetable($days = 7, $start_hour = 5, $end_hour = 23) {
        $schedule = array();
        $days_of_week = array(
            'monday' => __('Senin', 'radio-schedule'),
            'tuesday' => __('Selasa', 'radio-schedule'),
            'wednesday' => __('Rabu', 'radio-schedule'),
            'thursday' => __('Kamis', 'radio-schedule'),
            'friday' => __('Jumat', 'radio-schedule'),
            'saturday' => __('Sabtu', 'radio-schedule'),
            'sunday' => __('Minggu', 'radio-schedule')
        );
        
        // Get time slots berdasarkan parameter jam
        $time_slots = array();
        for ($i = $start_hour; $i <= $end_hour; $i++) {
            $time_slots[] = sprintf('%02d:00', $i);
        }
        
        $args = array(
            'post_type' => 'radio_program',
            'posts_per_page' => -1,
            'meta_query' => array(
                array(
                    'key' => '_is_recurring',
                    'value' => '1',
                    'compare' => '='
                )
            )
        );
        
        $programs = get_posts($args);
        
        // Initialize schedule structure
        $schedule_data = array();
        foreach ($time_slots as $time_slot) {
            $schedule_data[$time_slot] = array();
            foreach ($days_of_week as $day_key => $day_name) {
                $schedule_data[$time_slot][$day_name] = array();
            }
        }
        
        // Fill schedule with programs
        foreach ($programs as $program) {
            $schedule_days = get_post_meta($program->ID, '_schedule_days', true);
            $start_time = get_post_meta($program->ID, '_start_time', true);
            $end_time = get_post_meta($program->ID, '_end_time', true);
            $host = get_post_meta($program->ID, '_host_name', true);
            $color = get_post_meta($program->ID, '_program_color', true);
            
            if (is_array($schedule_days) && $start_time && $end_time) {
                $program_start_hour = (int) substr($start_time, 0, 2);
                $program_end_hour = (int) substr($end_time, 0, 2);
                
                foreach ($schedule_days as $day_key) {
                    $day_name = $days_of_week[$day_key];
                    
                    for ($hour = $program_start_hour; $hour <= $program_end_hour; $hour++) {
                        // Hanya tambahkan jika jam berada dalam range yang diminta
                        if ($hour >= $start_hour && $hour <= $end_hour) {
                            $time_slot = sprintf('%02d:00', $hour);
                            
                            if (isset($schedule_data[$time_slot][$day_name])) {
                                $schedule_data[$time_slot][$day_name][] = array(
                                    'title' => $program->post_title,
                                    'start_time' => $start_time,
                                    'end_time' => $end_time,
                                    'host' => $host,
                                    'color' => $color,
                                    'is_current' => $this->is_current_program($program, $day_key),
                                    'program_id' => $program->ID,
                                    'duration' => $this->calculate_duration($start_time, $end_time)
                                );
                            }
                        }
                    }
                }
            }
        }
        
        // Process merged cells
        $merged_schedule = $this->process_merged_cells($schedule_data, $time_slots, array_values($days_of_week), $start_hour, $end_hour);
        
        return array(
            'time_slots' => $time_slots,
            'days' => array_values($days_of_week),
            'schedule' => $merged_schedule,
            'start_hour' => $start_hour,
            'end_hour' => $end_hour
        );
    }
    
    private function process_merged_cells($schedule_data, $time_slots, $days, $start_hour, $end_hour) {
        $merged_data = array();
        
        foreach ($days as $day) {
            $day_programs = array();
            
            // Collect all programs for this day
            foreach ($time_slots as $time_slot) {
                if (!empty($schedule_data[$time_slot][$day])) {
                    foreach ($schedule_data[$time_slot][$day] as $program) {
                        $program_key = $program['program_id'] . '_' . $program['start_time'] . '_' . $program['end_time'];
                        
                        if (!isset($day_programs[$program_key])) {
                            $day_programs[$program_key] = array(
                                'program' => $program,
                                'time_slots' => array(),
                                'rowspan' => 1
                            );
                        }
                        
                        $day_programs[$program_key]['time_slots'][] = $time_slot;
                    }
                }
            }
            
            // Calculate rowspan for each program
            foreach ($day_programs as $key => $program_data) {
                $time_slots_count = count($program_data['time_slots']);
                if ($time_slots_count > 1) {
                    $day_programs[$key]['rowspan'] = $time_slots_count;
                }
            }
            
            // Build merged schedule
            foreach ($time_slots as $time_slot) {
                if (!isset($merged_data[$time_slot])) {
                    $merged_data[$time_slot] = array();
                }
                
                $merged_data[$time_slot][$day] = array();
                
                // Find program for this time slot
                foreach ($day_programs as $program_data) {
                    if (in_array($time_slot, $program_data['time_slots'])) {
                        // Only add to first time slot of the program
                        if ($time_slot === $program_data['time_slots'][0]) {
                            $merged_program = $program_data['program'];
                            $merged_program['rowspan'] = $program_data['rowspan'];
                            $merged_data[$time_slot][$day][] = $merged_program;
                        }
                    }
                }
            }
        }
        
        return $merged_data;
    }
    
    private function calculate_duration($start_time, $end_time) {
        $start = DateTime::createFromFormat('H:i', $start_time);
        $end = DateTime::createFromFormat('H:i', $end_time);
        
        if ($start && $end) {
            $interval = $start->diff($end);
            $hours = $interval->h;
            $minutes = $interval->i;
            
            if ($hours > 0) {
                return $hours . ' jam' . ($minutes > 0 ? ' ' . $minutes . ' menit' : '');
            } else {
                return $minutes . ' menit';
            }
        }
        
        return '';
    }
    
    private function is_current_program($program, $day_key) {
        $current_time = current_time('H:i');
        $current_day = strtolower(current_time('l'));
        
        if ($current_day !== $day_key) {
            return false;
        }
        
        $start_time = get_post_meta($program->ID, '_start_time', true);
        $end_time = get_post_meta($program->ID, '_end_time', true);
        
        return ($current_time >= $start_time && $current_time <= $end_time);
    }
    
    private function get_current_schedule() {
        $radio_manager = Radio_Schedule_Manager::get_instance();
        return $radio_manager->core->get_current_schedule();
    }
    
    private function get_next_program() {
        $radio_manager = Radio_Schedule_Manager::get_instance();
        return $radio_manager->core->get_next_program();
    }
    
    private function is_current_time_slot($time_slot) {
        $current_hour = (int) current_time('H');
        $slot_hour = (int) substr($time_slot, 0, 2);
        
        return $current_hour === $slot_hour;
    }
}
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