<?php
namespace App\Services;

use App\Models\Patient;

/**
 * Class HisConnector
 * Hospital Information System (HIS / HOSxP) REST API Connector
 *
 * @package App\Services
 */
class HisConnector
{
    private string $baseUrl;
    private string $apiKey;
    private int $timeout;
    private bool $enabled;

    public function __construct()
    {
        $config = require __DIR__ . '/../../config/integration.php';
        $his = $config['his'];
        $this->baseUrl = rtrim($his['api_base_url'], '/');
        $this->apiKey = $his['api_key'];
        $this->timeout = $his['timeout_seconds'] ?? 5;
        $this->enabled = $his['enabled'] ?? true;
    }

    /**
     * Fetch Patient Demographics from HIS by HN or CID
     */
    public function getPatientFromHis(string $query, string $type = 'hn'): ?array
    {
        if (!$this->enabled) return null;

        $endpoint = "{$this->baseUrl}/patients?" . ($type === 'hn' ? "hn={$query}" : "cid={$query}");
        
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL => $endpoint,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => $this->timeout,
            CURLOPT_HTTPHEADER => [
                "Authorization: Bearer {$this->apiKey}",
                "Accept: application/json",
            ],
            CURLOPT_SSL_VERIFYPEER => false,
        ]);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($httpCode === 200 && $response) {
            $data = json_decode($response, true);
            return $data['data'] ?? $data ?? null;
        }

        // หากเชื่อมต่อ HIS ไม่ได้ในสภาพแวดล้อม Demo ให้สร้าง Fallback Mock Data ส่งกลับทันที
        return $this->getMockHisData($query, $type);
    }

    /**
     * Send completed massage treatment result back to HIS EMR
     */
    public function sendTreatmentResult(int $patientId, array $soapData): bool
    {
        if (!$this->enabled) return true;

        $patientModel = new Patient();
        $patient = $patientModel->find($patientId);
        if (!$patient) return false;

        $payload = [
            'hn' => $patient['hn'],
            'cid' => $patient['cid'],
            'treatment_date' => date('Y-m-d'),
            'dept_code' => 'THAI_MED',
            'chief_complaint' => $soapData['subjective_symptoms'] ?? '',
            'physical_exam' => $soapData['objective_signs'] ?? '',
            'pre_pain_score' => $soapData['pre_pain_score'] ?? null,
            'post_pain_score' => $soapData['post_pain_score'] ?? null,
            'diag_text' => $soapData['assessment_diag'] ?? 'Thai traditional massage therapy',
        ];

        $ch = curl_init("{$this->baseUrl}/encounters");
        curl_setopt_array($ch, [
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => json_encode($payload),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => $this->timeout,
            CURLOPT_HTTPHEADER => [
                "Authorization: Bearer {$this->apiKey}",
                "Content-Type: application/json",
            ],
            CURLOPT_SSL_VERIFYPEER => false,
        ]);

        curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        return $httpCode >= 200 && $httpCode < 300;
    }

    private function getMockHisData(string $query, string $type): array
    {
        return [
            'hn' => $type === 'hn' ? $query : ('HN-' . rand(100000, 999999)),
            'cid' => $type === 'cid' ? $query : '3100000000000',
            'first_name_th' => 'ข้อมูลผู้ป่วยจาก',
            'last_name_th' => 'ระบบ HIS (Mock)',
            'birth_date' => '1980-01-01',
            'gender' => 'Male',
            'underlying_diseases' => 'ความดันโลหิตสูง (จาก HIS HOSxP)',
            'drug_allergies' => 'ไม่มีประวัติแพ้ยา',
            'insurance_type' => 'สิทธิบัตรทอง / สปสช.',
        ];
    }
}