<?php

namespace App\Controllers;

use App\Models\AppointmentModel;
use App\Models\PatientModel;

class Patient extends BaseController
{
    private function normalizeAppointmentTime(string $time): string
    {
        $time = trim($time);

        return preg_match('/^\d{2}:\d{2}$/', $time) ? $time . ':00' : $time;
    }

    public function dashboard()
    {
        if ($r = $this->requireRole('patient')) {
            return $r;
        }

        $db = \Config\Database::connect();

        $query = $db->query("
            SELECT doctors.id AS doctor_id, users.name, doctors.specialization
            FROM users
            JOIN doctors ON doctors.user_id = users.id
            WHERE users.role = 'doctor'
        ");
        $data['doctors'] = $query->getResult();

        $patientModel = new PatientModel();
        $userId       = (int) session()->get('id');
        $patient      = $patientModel->where('user_id', $userId)->first();

        $data['myAppointments'] = [];
        if ($patient) {
            $data['myAppointments'] = $db->query('
                SELECT a.id, a.appointment_date, a.appointment_time, a.status,
                       u.name AS doctor_name, doctors.specialization
                FROM appointments a
                JOIN doctors ON doctors.id = a.doctor_id
                JOIN users u ON u.id = doctors.user_id
                WHERE a.patient_id = ?
                ORDER BY a.appointment_date ASC, a.appointment_time ASC
            ', [$patient['id']])->getResult();
        }

        return view('patient/dashboard', $data);
    }

    public function bookAppointment()
    {
        if ($r = $this->requireRole('patient')) {
            return $r;
        }

        $rules = [
            'doctor_id' => 'required|integer',                                  
            'date'      => 'required|valid_date',
            'time'      => 'required',
        ];

        if (! $this->validate($rules)) {
            return redirect()->back()->withInput();
        }

        $appointmentModel = new AppointmentModel();
        $patientModel     = new PatientModel();

        $userId = (int) session()->get('id');
        $patient = $patientModel->where('user_id', $userId)->first();

        if (! $patient) {
            return redirect()->back()->with('error', 'Patient profile not found. Please contact support.');
        }

        $appointmentTime = $this->normalizeAppointmentTime((string) $this->request->getPost('time'));

        $data = [
            'patient_id'         => $patient['id'],
            'doctor_id'          => (int) $this->request->getPost('doctor_id'),
            'appointment_date'   => $this->request->getPost('date'),
            'appointment_time'   => $appointmentTime,
        ];

        $taken = $appointmentModel
            ->where('doctor_id', $data['doctor_id'])
            ->where('appointment_date', $data['appointment_date'])
            ->where('appointment_time', $appointmentTime)
            ->whereIn('status', ['pending', 'approved'])
            ->first();

        if ($taken) {
            return redirect()->back()->withInput()->with('error', 'That time slot is already booked for this doctor. Please choose another date or time.');
        }

        if (! $appointmentModel->insert($data)) {
            return redirect()->back()->withInput()->with('error', 'Could not book appointment.');
        }

        return redirect()->to(site_url('patient/dashboard'))->with('success', 'Appointment requested.');
    }
}