<?php

namespace App\Controllers;

use App\Models\AppointmentModel;
use App\Models\DoctorModel;
use CodeIgniter\HTTP\RedirectResponse;

class Doctor extends BaseController
{
    public function dashboard()
    {
        if ($r = $this->requireRole('doctor')) {
            return $r;
        }

        $db       = \Config\Database::connect();
        $userId   = (int) session()->get('id');
        $doctorModel = new DoctorModel();

        $doctor = $doctorModel->where('user_id', $userId)->first();
        if (! $doctor) {
            return redirect()->to(site_url('/'))->with('error', 'Doctor profile not found.');
        }

        $doctorId = (int) $doctor['id'];

        $query = $db->query('
            SELECT a.*, u.name as patient_name
            FROM appointments a
            JOIN patients p ON p.id = a.patient_id
            JOIN users u ON u.id = p.user_id
            WHERE a.doctor_id = ?
        ', [$doctorId]);

        $data['appointments'] = $query->getResult();

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

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

        $doctorModel = new DoctorModel();
        $userId      = (int) session()->get('id');
        $doctor      = $doctorModel->where('user_id', $userId)->first();

        if (! $doctor) {
            return redirect()->to(site_url('/'))->with('error', 'Doctor profile not found.');
        }

        if ($this->request->is('post')) {
            $rules = [
                'specialization' => 'required|min_length[2]|max_length[191]',
                'experience'     => 'permit_empty|max_length[100]',
                'fees'             => 'permit_empty|decimal',
                'available_from'   => 'permit_empty',
                'available_to'     => 'permit_empty',
            ];

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

            $update = [
                'specialization' => $this->request->getPost('specialization'),
                'experience'     => $this->request->getPost('experience') ?: null,
                'fees'           => $this->request->getPost('fees') !== '' && $this->request->getPost('fees') !== null
                    ? $this->request->getPost('fees')
                    : null,
                'available_from' => $this->request->getPost('available_from') ?: null,
                'available_to'   => $this->request->getPost('available_to') ?: null,
            ];

            if (! $doctorModel->update($doctor['id'], $update)) {
                return redirect()->back()->withInput()->with('error', 'Could not update profile.');
            }

            return redirect()->to(site_url('doctor/profile'))->with('success', 'Profile updated.');
        }

        return view('doctor/profile', ['doctor' => $doctor]);
    }

    public function accept($id): RedirectResponse
    {
        if ($r = $this->requireRole('doctor')) {
            return $r;
        }

        if (! $this->request->is('post')) {
            return redirect()->to(site_url('doctor/dashboard'))->with('error', 'Invalid request.');
        }

        return $this->updateAppointmentStatus((int) $id, 'approved');
    }

    public function reject($id): RedirectResponse
    {
        if ($r = $this->requireRole('doctor')) {
            return $r;
        }

        if (! $this->request->is('post')) {
            return redirect()->to(site_url('doctor/dashboard'))->with('error', 'Invalid request.');
        }

        return $this->updateAppointmentStatus((int) $id, 'rejected');
    }

    private function updateAppointmentStatus(int $appointmentId, string $status): RedirectResponse
    {
        if ($appointmentId < 1) {
            return redirect()->back();
        }

        $appointmentModel = new AppointmentModel();
        $doctorModel      = new DoctorModel();

        $userId = (int) session()->get('id');
        $doctor = $doctorModel->where('user_id', $userId)->first();
        if (! $doctor) {
            return redirect()->to(site_url('/'))->with('error', 'Doctor profile not found.');
        }

        $appointment = $appointmentModel->find($appointmentId);
        if (! $appointment || (int) $appointment['doctor_id'] !== (int) $doctor['id']) {
            return redirect()->back()->with('error', 'Invalid appointment.');
        }

        $appointmentModel->update($appointmentId, ['status' => $status]);

        return redirect()->back()->with('success', 'Appointment updated.');
    }
}