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

/**
 * Birt_proxy — PHP proxy untuk semua BIRT report call
 *
 * Flow:
 * 1. Terima request dari frontend (report_code + params)
 * 2. Decrypt patient PII dari _enc
 * 3. INSERT ke patient_print_cache
 * 4. Call BIRT via file_get_contents (internal)
 * 5. DELETE cache
 * 6. Stream PDF ke frontend
 *
 * Endpoint: POST /tools/birt_proxy/stream
 * Params  : report_code, PT_OrderHeaderID, PUsername, (optional) PID_patient
 */
class Birt_proxy extends MY_Controller
{
    private $db_onedev;
    private $birt_base = 'http://localhost:8080';

    public function __construct()
    {
        parent::__construct();
        $this->db_onedev = $this->load->database('onedev', true);
        $this->load->library('ibl_encryptor');
    }

    // POST /tools/birt_proxy/stream
    public function stream()
    {
        if (!$this->isLogin) {
            $this->sys_error('Invalid Token');
            return;
        }

        $prm         = $this->sys_input;
        $report_code = $prm['report_code'] ?? '';
        $order_id    = intval($prm['PT_OrderHeaderID'] ?? 0);
        $username    = $prm['PUsername'] ?? ($this->sys_user['userName'] ?? 'system');
        $tm          = round(microtime(true) * 1000);

        if (!$report_code) {
            $this->sys_error('report_code wajib diisi');
            return;
        }

        // 1. Ambil URL template dari print_transaction
        $row = $this->db_onedev->query(
            "SELECT Print_TransactionUrl FROM print_transaction WHERE Print_TransactionCode = ? LIMIT 1",
            [$report_code]
        )->row_array();

        if (!$row) {
            $this->sys_error("Report code tidak ditemukan: {$report_code}");
            return;
        }

        $url = $row['Print_TransactionUrl'];
        $url = str_replace('PT_OrderHeaderID', $order_id, $url);
        $url = str_replace('PUsername', urlencode($username), $url);
        $url = str_replace('TS', $tm, $url);

        // 2. Decrypt patient PII dan populate cache
        $cache_id = null;
        if ($order_id > 0) {
            $cache_id = $this->_populate_cache($order_id);
        }

        // 3. Build full BIRT URL dan fetch PDF
        $full_url = $this->birt_base . $url;

        $context = stream_context_create([
            'http' => [
                'timeout' => 120,
                'method'  => 'GET',
            ]
        ]);

        $pdf = @file_get_contents($full_url, false, $context);

        // 4. Hapus cache
        if ($cache_id) {
            $this->db_onedev->query(
                "DELETE FROM patient_print_cache WHERE ppc_id = ?",
                [$cache_id]
            );
        }

        if ($pdf === false) {
            $this->sys_error('Gagal generate report dari BIRT server');
            return;
        }

        // 5. Stream PDF ke frontend
        $filename = $report_code . '_' . $order_id . '_' . date('Ymd') . '.pdf';
        header('Content-Type: application/pdf');
        header('Content-Disposition: inline; filename="' . $filename . '"');
        header('Content-Length: ' . strlen($pdf));
        echo $pdf;
        exit;
    }

    // Hanya return URL (untuk iframe/window.open) — tanpa stream
    // Frontend membuka URL ini secara langsung
    public function get_url()
    {
        if (!$this->isLogin) {
            $this->sys_error('Invalid Token');
            return;
        }

        $prm         = $this->sys_input;
        $report_code = $prm['report_code'] ?? '';
        $order_id    = intval($prm['PT_OrderHeaderID'] ?? 0);
        $username    = $prm['PUsername'] ?? ($this->sys_user['userName'] ?? 'system');
        $tm          = round(microtime(true) * 1000);

        $row = $this->db_onedev->query(
            "SELECT Print_TransactionUrl FROM print_transaction WHERE Print_TransactionCode = ? LIMIT 1",
            [$report_code]
        )->row_array();

        if (!$row) {
            $this->sys_error("Report code tidak ditemukan: {$report_code}");
            return;
        }

        $url = $row['Print_TransactionUrl'];
        $url = str_replace('PT_OrderHeaderID', $order_id, $url);
        $url = str_replace('PUsername', urlencode($username), $url);
        $url = str_replace('TS', $tm, $url);

        // Pre-populate cache — frontend buka URL langsung ke BIRT
        // Cache hidup 5 menit, cukup untuk BIRT generate PDF
        if ($order_id > 0) {
            $this->_populate_cache($order_id);
        }

        $this->sys_ok(['url' => $url]);
    }

    // Decrypt patient PII dan simpan ke cache
    private function _populate_cache($order_id)
    {
        // Ambil _enc columns dari m_patient via t_orderheader
        $patient = $this->db_onedev->query(
            "SELECT M_PatientID,
                    M_PatientName_enc, M_PatientDOB_enc, M_PatientHP_enc,
                    M_PatientEmail_enc, M_PatientDOB
             FROM t_orderheader
             JOIN m_patient ON T_OrderHeaderM_PatientID = M_PatientID
             WHERE T_OrderHeaderID = ? LIMIT 1",
            [$order_id]
        )->row_array();

        if (!$patient) return null;

        $addr = $this->db_onedev->query(
            "SELECT M_PatientAddressDescription_enc
             FROM m_patientaddress
             WHERE M_PatientAddressM_PatientID = ?
               AND M_PatientAddressIsActive = 'Y'
               AND M_PatientAddressNote = 'Utama'
             LIMIT 1",
            [$patient['M_PatientID']]
        )->row_array();

        $enc  = $this->ibl_encryptor;
        $name = $enc->decrypt($patient['M_PatientName_enc'] ?? '') ?? '';
        $dob  = $enc->decrypt($patient['M_PatientDOB_enc']  ?? '') ?? date('d-m-Y', strtotime($patient['M_PatientDOB'] ?? 'now'));
        $hp   = $enc->decrypt($patient['M_PatientHP_enc']   ?? '') ?? '';
        $email= $enc->decrypt($patient['M_PatientEmail_enc']?? '') ?? '';
        $address = $enc->decrypt($addr['M_PatientAddressDescription_enc'] ?? '') ?? '';

        // Hapus cache lama untuk order ini + cleanup expired
        $this->db_onedev->query(
            "DELETE FROM patient_print_cache WHERE ppc_order_id = ? OR ppc_created < NOW() - INTERVAL 5 MINUTE",
            [$order_id]
        );

        // Insert cache baru
        $this->db_onedev->query(
            "INSERT INTO patient_print_cache
             (ppc_order_id, ppc_patient_id, ppc_name, ppc_dob, ppc_hp, ppc_email, ppc_address, ppc_created)
             VALUES (?, ?, ?, ?, ?, ?, ?, NOW())",
            [$order_id, $patient['M_PatientID'], $name, $dob, $hp, $email, $address]
        );

        return $this->db_onedev->insert_id();
    }
}