<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Generateschedule extends CI_Controller {

    public function __construct()
    {
        parent::__construct();

        $this->load->database();

        date_default_timezone_set('Asia/Jakarta');
    }

    // =====================================================
    // INDEX
    // =====================================================
    public function index()
    {
        $data = [
            "active_menu" => "generate_schedule"
        ];

        // ============================================
        // POSITIONS
        // ============================================
        $data['positions'] = $this->db
            ->where('is_active',1)
            ->order_by('position_name','ASC')
            ->get('k_positions')
            ->result();

        // ============================================
        // SHIFTS
        // ============================================
        $data['shifts'] = $this->db
            ->order_by('shift_code','ASC')
            ->get('k_shifts')
            ->result();

        $this->load->view('partials/header', $data);
        $this->load->view('employees/generate_schedule', $data);
        $this->load->view('partials/footer');
    }

// =====================================================
// CALENDAR DATA
// =====================================================
public function calendar_data()
{
    $month = (int)$this->input->get('month');
    $year  = (int)$this->input->get('year');

    if(empty($month)){
        $month = date('n');
    }

    if(empty($year)){
        $year = date('Y');
    }

    $firstDate = $year . '-'
        . str_pad($month,2,'0',STR_PAD_LEFT)
        . '-01';

    // ============================================
    // START MONDAY
    // ============================================
    $startDate = date(
        'Y-m-d',
        strtotime('monday this week', strtotime($firstDate))
    );

    if(date('N', strtotime($firstDate)) == 1){
        $startDate = $firstDate;
    }

    // ============================================
    // END SUNDAY
    // ============================================
    $lastDate = date(
        'Y-m-t',
        strtotime($firstDate)
    );

    $endDate = date(
        'Y-m-d',
        strtotime('sunday this week', strtotime($lastDate))
    );

    $days = [];

    $current = strtotime($startDate);
    $end     = strtotime($endDate);

    while($current <= $end){

        $date = date('Y-m-d', $current);

        // ========================================
        // GET SCHEDULE GROUP BY SHIFT
        // ========================================
        $this->db->select('
            sh.id as shift_id,
            sh.shift_name,

            p.position_name,

            COUNT(s.id) as total_employee
        ');

        $this->db->from('k_employee_shift_schedules s');

        $this->db->join(
            'k_employees e',
            'e.id = s.employee_id',
            'left'
        );

        $this->db->join(
            'k_positions p',
            'p.id = e.position_id',
            'left'
        );

        $this->db->join(
            'k_shifts sh',
            'sh.id = s.shift_id',
            'left'
        );

        $this->db->where('DATE(s.start_datetime)', $date);

        // ========================================
        // GROUPING
        // ========================================
        $this->db->group_by('sh.id');
        $this->db->group_by('p.id');

        $this->db->order_by('sh.checkin_time','ASC');
        $this->db->order_by('p.position_name','ASC');

        $rows = $this->db->get()->result();

        // ========================================
        // FORMAT GROUPED
        // ========================================
        $grouped = [];

        if($rows){

            foreach($rows as $r){

                $shiftId = $r->shift_id ?: 0;

                if(!isset($grouped[$shiftId])){

                    $grouped[$shiftId] = [

                        'shift_id'   => $r->shift_id,

                        'shift_name' => $r->shift_name ?: '-',

                        'positions'  => []
                    ];
                }

                $grouped[$shiftId]['positions'][] = [

                    'position_name' => $r->position_name ?: '-',

                    'total'         => (int)$r->total_employee
                ];
            }
        }

        $days[] = [

            'date' => date('d', strtotime($date)),

            'month' => date('M', strtotime($date)),

            'day_name' => $this->translateDay(
                date('l', strtotime($date))
            ),

            'full_date' => tanggal_indo($date),

            'full_date_raw' => $date,

            'is_current_month' => (
                date('m', strtotime($date))
                ==
                str_pad($month,2,'0',STR_PAD_LEFT)
            ),

            'shifts' => array_values($grouped)
        ];

        $current = strtotime('+1 day', $current);
    }

    echo json_encode([
        'days' => $days
    ]);
}

    // =====================================================
    // GET EMPLOYEE
    // =====================================================
    public function get_employees()
    {
        $position_id = $this->input->get('position_id');

        $this->db->select('
            e.id,
            e.full_name,
            e.fingerprint_user_id,

            p.position_name
        ');

        $this->db->from('k_employees e');

        $this->db->join(
            'k_positions p',
            'p.id=e.position_id',
            'left'
        );

        $this->db->where('e.is_active',1);

        if(!empty($position_id)){
            $this->db->where('e.position_id',$position_id);
        }

        $this->db->order_by('e.full_name','ASC');

        $employees = $this->db->get()->result();

        echo json_encode([
            'data' => $employees
        ]);
    }

// =====================================================
// SAVE MANUAL SCHEDULE
// =====================================================
public function save_manual_schedule()
{
    try{

        $employee_ids = $this->input->post('employee_ids');

        $schedule_date = $this->input->post('schedule_date');

        $shift_id = $this->input->post('shift_id');

        // ============================================
        // VALIDASI
        // ============================================
        if(empty($employee_ids)){
            throw new Exception('Employee belum dipilih');
        }

        if(empty($schedule_date)){
            throw new Exception('Tanggal wajib diisi');
        }

        if(empty($shift_id)){
            throw new Exception('Shift wajib dipilih');
        }

        // ============================================
        // GET SHIFT
        // ============================================
        $shift = $this->db
            ->where('id', $shift_id)
            ->get('k_shifts')
            ->row();

        if(!$shift){
            throw new Exception('Shift tidak ditemukan');
        }

        // ============================================
        // BUILD START DATETIME
        // ============================================
        $start_datetime = date(
            'Y-m-d H:i:s',
            strtotime(
                $schedule_date . ' ' . $shift->checkin_time
            )
        );

        // ============================================
        // BUILD END DATETIME
        // ============================================
        $end_datetime = date(
            'Y-m-d H:i:s',
            strtotime(
                $schedule_date . ' ' . $shift->checkout_time
            )
        );

        // ============================================
        // JIKA SHIFT NYEBRANG HARI
        // ============================================
        $is_cross_day = 0;

        if(
            strtotime($shift->checkout_time)
            <=
            strtotime($shift->checkin_time)
        ){

            $end_datetime = date(
                'Y-m-d H:i:s',
                strtotime('+1 day', strtotime($end_datetime))
            );

            $is_cross_day = 1;
        }

        // ============================================
        // HITUNG TOTAL JAM KERJA
        // ============================================
        $work_hours = (
            strtotime($end_datetime)
            -
            strtotime($start_datetime)
        ) / 3600;

        // ============================================
        // LOOP EMPLOYEE
        // ============================================
        foreach($employee_ids as $employee_id){

            // ========================================
            // CHECK EXIST
            // ========================================
            $exists = $this->db
                ->where('employee_id', $employee_id)
                ->where('schedule_date', $schedule_date)
                ->get('k_employee_shift_schedules')
                ->row();

            // ========================================
            // DATA SAVE
            // ========================================
            $saveData = [

                'employee_id'     => $employee_id,

                'shift_id'        => $shift_id,

                'start_datetime'  => $start_datetime,

                'end_datetime'    => $end_datetime,

                'work_hours'      => $work_hours,

                'is_cross_day'    => $is_cross_day,

                'schedule_source' => 'manual',

                'notes'           => 'manual planner',

                'updated_at'      => date('Y-m-d H:i:s')
            ];

            // ========================================
            // UPDATE
            // ========================================
            if($exists){

                $this->db
                    ->where('id', $exists->id)
                    ->update(
                        'k_employee_shift_schedules',
                        $saveData
                    );

            // ========================================
            // INSERT
            // ========================================
            } else {

                $saveData['created_at'] = date('Y-m-d H:i:s');

                $this->db->insert(
                    'k_employee_shift_schedules',
                    $saveData
                );
            }
        }

        echo json_encode([
            'status'  => true,
            'message' => 'Jadwal berhasil disimpan'
        ]);

    } catch(Exception $e){

        echo json_encode([
            'status'  => false,
            'message' => $e->getMessage()
        ]);
    }
}

    // =====================================================
    // TRANSLATE DAY
    // =====================================================
    private function translateDay($day)
    {
        $days = [
            'Sunday'    => 'Minggu',
            'Monday'    => 'Senin',
            'Tuesday'   => 'Selasa',
            'Wednesday' => 'Rabu',
            'Thursday'  => 'Kamis',
            'Friday'    => 'Jumat',
            'Saturday'  => 'Sabtu'
        ];

        return isset($days[$day])
            ? $days[$day]
            : $day;
    }
    
// =====================================================
// DETAIL SCHEDULE
// =====================================================
public function detail_schedule()
{
    $schedule_date = $this->input->get('schedule_date');

    if(empty($schedule_date)){

        echo json_encode([
            'status' => false,
            'message'=> 'Tanggal wajib diisi',
            'data'   => []
        ]);

        return;
    }

    // ============================================
    // GET DATA
    // ============================================
    $this->db->select('
        s.id as schedule_id,

        s.employee_id,
        s.shift_id,

        s.start_datetime,
        s.end_datetime,

        e.employee_code,
        e.full_name,
        e.fingerprint_user_id,

        p.id as position_id,
        p.position_name,

        sh.shift_name,
        sh.checkin_time,
        sh.checkout_time,
        sh.color
    ');

    $this->db->from('k_employee_shift_schedules s');

    $this->db->join(
        'k_employees e',
        'e.id=s.employee_id',
        'left'
    );

    $this->db->join(
        'k_positions p',
        'p.id=e.position_id',
        'left'
    );

    $this->db->join(
        'k_shifts sh',
        'sh.id=s.shift_id',
        'left'
    );

    // ============================================
    // FILTER DATE
    // ============================================
    $this->db->where(
        'DATE(s.start_datetime)',
        $schedule_date
    );

    $this->db->order_by('p.position_name','ASC');

    $this->db->order_by('e.full_name','ASC');

    $rows = $this->db->get()->result();

    // ============================================
    // GROUP POSITION
    // ============================================
    $grouped = [];

    if($rows){

        foreach($rows as $r){

            $position_id = $r->position_id ?: 0;

            // ====================================
            // CREATE GROUP
            // ====================================
            if(!isset($grouped[$position_id])){

                $grouped[$position_id] = [

                    'position_id'   => $r->position_id,

                    'position_name' => $r->position_name ?: '-',

                    'employees'     => []
                ];
            }

            // ====================================
            // EMPLOYEE
            // ====================================
            $grouped[$position_id]['employees'][] = [

                'schedule_id' => $r->schedule_id,

                'employee_id' => $r->employee_id,

                'full_name'   => $r->full_name,
                
                'employee_code' => $r->employee_code,
    
                'fingerprint_user_id' => $r->fingerprint_user_id,

                'shift_id'    => $r->shift_id,

                'shift_name'  => $r->shift_name,

                'checkin' => $r->checkin_time
                    ? date(
                        'H:i',
                        strtotime($r->checkin_time)
                    )
                    : '-',

                'checkout' => $r->checkout_time
                    ? date(
                        'H:i',
                        strtotime($r->checkout_time)
                    )
                    : '-',

                'start_datetime' => $r->start_datetime,

                'end_datetime'   => $r->end_datetime,

                'color' => $r->color
            ];
        }
    }

    echo json_encode([
        'status' => true,
        'data'   => array_values($grouped)
    ]);
}

// =====================================================
// UPDATE SCHEDULE SHIFT
// =====================================================
public function update_schedule_shift()
{
    try{

        $schedule_id = $this->input->post('schedule_id');

        $shift_id = $this->input->post('shift_id');

        // ============================================
        // VALIDASI
        // ============================================
        if(empty($schedule_id)){
            throw new Exception('Schedule ID kosong');
        }

        if(empty($shift_id)){
            throw new Exception('Shift wajib dipilih');
        }

        // ============================================
        // CHECK SCHEDULE
        // ============================================
        $schedule = $this->db
            ->where('id', $schedule_id)
            ->get('k_employee_shift_schedules')
            ->row();

        if(!$schedule){
            throw new Exception('Schedule tidak ditemukan');
        }

        // ============================================
        // CHECK SHIFT
        // ============================================
        $shift = $this->db
            ->where('id', $shift_id)
            ->get('k_shifts')
            ->row();

        if(!$shift){
            throw new Exception('Shift tidak ditemukan');
        }

        // ============================================
        // AMBIL TANGGAL
        // ============================================
        $schedule_date = date(
            'Y-m-d',
            strtotime($schedule->start_datetime)
        );

        // ============================================
        // BUILD START DATETIME
        // ============================================
        $start_datetime = date(
            'Y-m-d H:i:s',
            strtotime(
                $schedule_date . ' ' . $shift->checkin_time
            )
        );

        // ============================================
        // BUILD END DATETIME
        // ============================================
        $end_datetime = date(
            'Y-m-d H:i:s',
            strtotime(
                $schedule_date . ' ' . $shift->checkout_time
            )
        );

        // ============================================
        // CROSS DAY
        // ============================================
        $is_cross_day = 0;

        if(
            strtotime($shift->checkout_time)
            <=
            strtotime($shift->checkin_time)
        ){

            $end_datetime = date(
                'Y-m-d H:i:s',
                strtotime('+1 day', strtotime($end_datetime))
            );

            $is_cross_day = 1;
        }

        // ============================================
        // WORK HOURS
        // ============================================
        $work_hours = $shift->work_hours;

        // ============================================
        // UPDATE
        // ============================================
        $this->db
            ->where('id', $schedule_id)
            ->update(
                'k_employee_shift_schedules',
                [

                    'shift_id'       => $shift_id,

                    'start_datetime' => $start_datetime,

                    'end_datetime'   => $end_datetime,

                    'work_hours'     => $work_hours,

                    'is_cross_day'   => $is_cross_day,

                    'updated_at'     => date('Y-m-d H:i:s')
                ]
            );

        echo json_encode([
            'status'  => true,
            'message' => 'Shift berhasil diupdate'
        ]);

    } catch(Exception $e){

        echo json_encode([
            'status'  => false,
            'message' => $e->getMessage()
        ]);
    }
}


// =====================================================
// DELETE SCHEDULE
// =====================================================
public function delete_schedule()
{
    try{

        $schedule_id = $this->input->post('schedule_id');

        // ============================================
        // VALIDASI
        // ============================================
        if(empty($schedule_id)){
            throw new Exception('Schedule ID kosong');
        }

        // ============================================
        // CHECK DATA
        // ============================================
        $schedule = $this->db
            ->where('id', $schedule_id)
            ->get('k_employee_shift_schedules')
            ->row();

        if(!$schedule){
            throw new Exception('Schedule tidak ditemukan');
        }

        // ============================================
        // DELETE
        // ============================================
        $this->db
            ->where('id', $schedule_id)
            ->delete('k_employee_shift_schedules');

        echo json_encode([
            'status'  => true,
            'message' => 'Schedule berhasil dihapus'
        ]);

    } catch(Exception $e){

        echo json_encode([
            'status'  => false,
            'message' => $e->getMessage()
        ]);
    }
}

}