<?php
namespace App\Controllers;

use App\Helpers\EscPosPrinter;
use App\Helpers\Response;
use App\Helpers\Validator;
use App\Middleware\JwtAuthMiddleware;
use App\Models\Payment;
use App\Models\Queue;
use App\Services\AuditLogger;

/**
 * Class BillingController
 * POS Cashier & Thermal Printing REST API Controller
 *
 * @package App\Controllers
 */
class BillingController
{
    private Payment $paymentModel;

    public function __construct()
    {
        $this->paymentModel = new Payment();
    }

    /**
     * POST /api/v1/billing/checkout - Cashier Checkout & Payment Processing
     */
    public function checkout(): void
    {
        $user = JwtAuthMiddleware::handle();
        $input = json_decode(file_get_contents('php://input'), true) ?? $_POST;

        $validator = Validator::make($input, [
            'queue_id' => 'required|numeric',
            'patient_id' => 'required|numeric',
            'subtotal' => 'required|numeric',
        ]);

        if ($validator->fails()) {
            Response::error('ข้อมูลการคิดเงินไม่ถูกต้อง', 422, $validator->getErrors());
        }

        $input['branch_id'] = $input['branch_id'] ?? $user['branch'];
        $input['cashier_id'] = $user['id'];

        $res = $this->paymentModel->processCheckout($input);
        AuditLogger::logPayment($res['payment_id'], $res['receipt_no'], (float)$res['net_amount']);

        Response::success('ชำระเงินและออกใบเสร็จรับเงินสำเร็จ', $res, 201);
    }

    /**
     * GET /api/v1/billing/print-ticket/{queueId} - Get Base64 ESC/POS Queue Ticket Buffer
     */
    public function printTicket(int $queueId): void
    {
        JwtAuthMiddleware::handle();

        $queue = (new Queue())->find($queueId);
        if (!$queue) {
            Response::error('ไม่พบข้อมูลคิวสำหรับพิมพ์ใบคิว', 404);
        }

        // ดึงชื่อสาขา ผู้ป่วย และหมอนวด
        $db = \App\Models\Model::getDB();
        $stmt = $db->prepare("SELECT b.name_th as branch_name, CONCAT(p.first_name_th, ' ', p.last_name_th) as patient_name, 
                                     s.name_th as service_name, CONCAT(u.first_name, ' ', u.last_name) as therapist_name,
                                     r.room_no
                              FROM queues q
                              JOIN branches b ON q.branch_id = b.id
                              JOIN patients p ON q.patient_id = p.id
                              JOIN services s ON q.service_id = s.id
                              LEFT JOIN therapists t ON q.therapist_id = t.id
                              LEFT JOIN users u ON t.user_id = u.id
                              LEFT JOIN rooms r ON q.room_id = r.id
                              WHERE q.id = :id");
        $stmt->execute(['id' => $queueId]);
        $details = $stmt->fetch();

        $ticketData = array_merge($queue, $details ?: []);
        $base64Buffer = EscPosPrinter::buildQueueTicket($ticketData);

        Response::success('คำสั่งเครื่องพิมพ์ความร้อน ESC/POS (Base64)', [
            'queue_id' => $queueId,
            'queue_no' => $queue['queue_no'],
            'printer_type' => 'ESC/POS Thermal 80mm/58mm',
            'raw_base64_buffer' => $base64Buffer,
            'webusb_ready' => true,
        ]);
    }
}