function list_all_users() {
    let tbody = document.getElementById("user_manager_table_body");
    tbody.innerHTML = "";
    let req = {action: "get_all_users"};
    request(req).then(resp => {
        let users = JSON.parse(resp);
        for (let i = 0; i < users.length; i++) {
            let u = users[i];
            let row = document.createElement("tr");
            let chkbox = document.createElement("input");
            chkbox.type = "checkbox";
            chkbox.name = "user_chkbox";
            chkbox.user = u;
            let tdChkBox = document.createElement("td");
            tdChkBox.appendChild(chkbox);
            tdChkBox.classList.add("checkbox");
            let tdNickName = create_table_cell(u["nickname"]);
            let tdRealName = create_table_cell(u["realname"]);
            let tdGroups = create_table_cell(u["groups"].join(", "));
            let tdPrivilege = create_table_cell(u["privilege"]);
            row.append(tdChkBox, tdNickName, tdRealName, tdGroups, tdPrivilege);
            tbody.appendChild(row);

            let edit_user_action = () => {
                if (get_selected_users().length === 0) {
                    edit_user(u);
                }
            };

            tdNickName.addEventListener("click", edit_user_action);
            tdRealName.addEventListener("click", edit_user_action);
            tdGroups.addEventListener("click", edit_user_action);
            tdPrivilege.addEventListener("click", edit_user_action)
        }
    });
}

function create_new_user() {
    const generateRandomString = () => {
        return Math.floor(Math.random() * Date.now()).toString(36);
    };

    let nicknameF = document.getElementById("nickname");
    let realnameF = document.getElementById("realname");
    let passwordF = document.getElementById("password");
    let groupsF = document.getElementById("groups");
    let privilegeF = document.getElementById("privilege");
    let submit_btn = document.getElementById("user_editor_submit_btn");

    nicknameF.value = "";
    nicknameF.readOnly = false;
    realnameF.value = "";
    passwordF.type = "text";
    passwordF.value = generateRandomString();
    passwordF.readOnly = true;
    groupsF.value = "";
    submit_btn.value = "Létrehozás"

    submit_btn.onclick = () => {
        let nickname = nicknameF.value.trim();
        if (nickname !== "") {
            let req = {
                action: "create_user",
                nickname: nickname,
                realname: realnameF.value.trim(),
                password: passwordF.value,
                groups: groupsF.value.trim(),
                privilege: privilegeF.value
            };
            request(req).then(resp => {
                list_all_users();
            });
            hide("user_editor_window");
        }
    };

    show("user_editor_window");
}

function edit_user(user) {
    let nicknameF = document.getElementById("nickname");
    let realnameF = document.getElementById("realname");
    let passwordF = document.getElementById("password");
    let groupsF = document.getElementById("groups");
    let privilegeF = document.getElementById("privilege");
    let submit_btn = document.getElementById("user_editor_submit_btn");

    nicknameF.value = user["nickname"];
    nicknameF.readOnly = true;
    realnameF.value = user["realname"];
    passwordF.type = "password";
    passwordF.value = "";
    passwordF.readOnly = false;
    groupsF.value = user["groups"].join(", ");
    privilegeF.value = user["privilege"];
    submit_btn.value = "Mentés"

    submit_btn.onclick = () => {
        let nickname = nicknameF.value.trim();
        if (nickname !== "") {
            let req = {
                action: "update_user",
                nickname: nickname,
                realname: realnameF.value.trim(),
                password: passwordF.value,
                groups: groupsF.value.trim(),
                privilege: privilegeF.value
            };
            request(req).then(resp => {
                list_all_users();
            });
            hide("user_editor_window");
        }
    };

    show("user_editor_window");
}

function get_selected_users() {
    let selected_chkboxes = document.getElementsByName("user_chkbox");
    let selected_users = [];
    selected_chkboxes.forEach((chkbox) => {
        if (chkbox.checked) {
            selected_users.push(chkbox.user);
        }
    });
    return selected_users;
}

function delete_users() {
    let users = get_selected_users();
    if (users.length === 0) {
        return;
    }
    let user_nicknames = [];
    users.forEach((u) => {
        user_nicknames.push(u["nickname"]);
    });
    let msg = "Biztosan törölni kívánja a következő felhasználó(ka)t?\n\n" + user_nicknames.join(", ") + "\n\n"
        + "A törlés nem vonható vissza!";
    if (confirm(msg)) {
        let req = {action: "delete_users", users: user_nicknames.join(",")};
        request(req).then(resp => {
            list_all_users();
        });
    }
}

function hint_all_groups(target_element_id) {
    const hintbox_insert_fn = (record) => {
        let targetF = document.getElementById(target_element_id);
        let groups = explode_sanitize_string_list(targetF.value);
        groups.pop();
        groups.push(record);
        targetF.value = groups.join(", ");
        close_hintbox(true);
    }

    let req = {
        action: "search_groups",
    }

    open_hintbox_at(target_element_id, req, print_group_name, hintbox_insert_fn);
}