<?php
include 'functions/functions.php';

if (isset($_POST['ajax_id'])) {
    switch ($_POST['ajax_id']) {
        case 'todo':
            handle_todo();
            break;
        case 'login':
            handle_login();
            break;
    }
} else {
    $response = [
        'error' => 'Malformed URI request.',
    ];

    echo json_encode($response);
}

function handle_login()
{
    $response = ['log' => []];

    if (isset($_POST['user_id']) && isset($_POST['username']) && isset($_POST['role'])) {
        $response['log'][] = 'Required parameters met. Logging user in.';
        $_SESSION['user_id'] = $_POST['user_id'];
        $_SESSION['username'] = $_POST['username'];
        $_SESSION['role_id'] = $_POST['role'];

        $response['redirect'] = 'articles.php?view=list';
    }

    echo json_encode($response);
}

function handle_todo()
{
    include 'functions/todo_functions.php';
    $response = ['log' => []];
    if (isset($_POST['todo_id']) && isset($_POST['action_id'])) {
        $response['log'][] = 'Required parameters met.';
        switch ($_POST['action_id']) {
            case 'status':
                $response['log'][] = 'Changing status on ' . $_POST['todo_id'] . ' to ' . $_POST['status'] . '.';
                change_status($_POST['todo_id'], $_POST['status']);
                break;
            case 'create_update_todo':
                if ($_POST['todo_id'] != -1) {
                    $response['log'][] = 'Updating todo information on ' . $_POST['todo_id'] . '.';
                    update_todo($_POST['todo_id'], urldecode($_POST['todo']));
                } else {
                    $response['log'][] = 'Creating todo information on ' . $_POST['todo_id'] . '.';
                    create_todo(urldecode($_POST['todo']));
                }
                break;
        }
    }

    echo json_encode($response);
}