var timer;
function message_timer() {
    clearInterval(timer);
    timer = setInterval(function() {
        $.ajax({
            method: "POST",
            url: 'user_actions.php',
            data:{action: 'check_for_changes'},
            success:function(change_detected) {
                if(change_detected) {
                    refresh_chat_list();
                    refresh_messages();
                }
            }
        });
        
    }, 5000);
}

function refresh_messages() {
    $.ajax({
        method: "POST",
        url: 'user_actions.php',
        data:{action: 'refresh_messages'},
        success:function(html) {
            $("#msg_history").html(html);
            scroll_history();
        }
    });
}

function refresh_chat_list() {
    $.ajax({
        method: "POST",
        url: 'user_actions.php',
        data: {action: 'refresh_chat_list'},
        success:function(html) {
            $("#inbox_chat").html(html);
            set_chat_clicked();
        }
    });
}

function scroll_history() {
    var d = $("#msg_history");
    d.scrollTop(d.prop("scrollHeight"));
}

function set_chat_clicked() {
    $(".chat_list").on('click', function(event) {
        event.stopPropagation();
        event.stopImmediatePropagation();

        message_timer();
        $.ajax({
            method: "POST",
            url: 'user_actions.php',
            data:{action: 'set_selected_chat',
                chat_id: $(this).attr('id')},
            success:function(html) {
                refresh_chat_list();
                refresh_messages();
            }
        });
    });
}

$(window).on('load', scroll_history);
$(window).on('load', message_timer);

$("#inbox_chat").ready(set_chat_clicked);