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

class User extends CI_Controller {

    public function __construct() {

        parent::__construct();

        $this->load->library('session');
        $this->load->model('users_model', '', TRUE);
    }

    public function index() {

        // Authenticate
        echo 'Logged in as ' . $this->session->userdata('screen_name');
    }

    public function authenticate() {

        if( ! $this->session->userdata('id')) {

            // Load libraries
            $this->load->library('form_validation');

            // Header
            $data['page_title'] = 'Authentication Page';
            $this->load->view('header', $data);

            // Set validation rules
            $this->form_validation->set_rules('username', 'Username', 'required|min_length[3]|max_length[15]');
            $this->form_validation->set_rules('password', 'Password', 'required|min_length[5]');

            // Validate
            if( ! $this->form_validation->run()) {

                // Form
                $this->load->view('login');
            } else {

                // Get data
                $username = $this->input->post('username');
                $password = sha1($this->input->post('password'));

                // Check the credentials
                $user_info = $this->users_model->check_user($username, $password);

                if($user_info) {

                    // Login successful

                    // Create user info array to be passed to set_userdata()
                    $session_info['id']          = $user_info->id;
                    $session_info['username']    = $user_info->username;
                    $session_info['screen_name'] = $user_info->screen_name;

                    // Set the data
                    $this->session->set_userdata($session_info);

                    $this->username = $this->session->userdata('username');
                    $this->screen_name = $this->session->userdata('screen_name');

                    // Redirect to the main page
                    redirect('/');
                } else {

                    // Invalid data; Reload the form
                    $data['invalid'] = 'Sorry, but the username/password combination is invalid,
                                        or you do not have enough privileges yet. Please try again!';
                    $this->load->view('login', $data);
                }
            }

            // Footer
            $this->load->view('footer');
        } else {

            redirect('/');
        }
    }

    public function logout() {

        if($this->session->userdata('id')) {

            // Clear user data
            $this->session->sess_destroy();
            redirect('/user/authenticate');
        } else {

            // Already logged out
        }
    }

    public function register() {

        if( ! $this->session->userdata('id')) {

            // Form validation
            $this->load->library('form_validation');

            // Header
            $data['page_title'] = 'Registration Page';
            $this->load->view('header', $data);

            // Form validation rules
            $this->form_validation->set_rules('username', 'Username', 'required|min_length[4]|max_length[15]');
            $this->form_validation->set_rules('screen_name', 'Screen Name', 'min_length[4]|max_length[25]');
            $this->form_validation->set_rules('password', 'Password', 'required|min_length[5]|matches[pass_conf]');
            $this->form_validation->set_rules('pass_conf', 'Password Confirmation', 'required|min_length[5]|');
            $this->form_validation->set_rules('email', 'Email', 'required|valid_email|min_length[5]');

            // Run the validation
            if( ! $this->form_validation->run()) {

                // Form
                $this->load->view('register');
            } else {

                // Get the data
                $username    = $this->input->post('username');
                $password    = sha1($this->input->post('password'));
                $email       = $this->input->post('email');
                $screen_name = $this->input->post('screen_name');

                // If the Username, the Screen Name or the Email Address are already in use, display an error message
                if( ! ($this->users_model->check_field('username', $username)
                    && $this->users_model->check_field('screen_name', $screen_name)
                    && $this->users_model->check_field('email', $email))) {

                    // Rebuild the form
                    $data['invalid'] = 'The Username, Screen Name or Email Address are already in use';
                    $this->load->view('register', $data);
                } else {

                    // Add the user
                    $user_id = $this->users_model->add_user($username, $password, $email, $screen_name);

                    // Display registration link
                    $registration_url = base_url() . 'user/activate/' . sha1($user_id);
                    $data['success'] = 'Congratulations! You are now registered in our database,
                                        but in order to start using your account,
                                        you will need to activate it by pressing the link below:
                                        ' . "\n\n" .
                                        '<a href="' . $registration_url . '">' . $registration_url . '</a>';
                    $this->load->view('message', $data);
                }
            }

            $this->load->view('footer');
        } else {

            redirect('/');
        }
    }

    public function activate($user_id) {

        $result = $this->users_model->activate_account($user_id);

        if($result == 1) {

            $data['error'] = 'This account is already activated!';
            $this->load->view('message', $data);
        } else if($result == 2) {

            $data['error'] = 'The requested account could not be found!';
            $this->load->view('message', $data);
        } else {

            $data['success'] = 'The account has been successfully activated! <a href="' . site_url('user/authenticate') . '">Click here to authenticate</a>!';
            $this->load->view('message', $data);
        }
    }
}