#!/usr/bin/env bash
#
# Yamada Hayao
# Twitter: @Hayao0819
# Email  : hayao@fascode.net
#
# (c) 2019-2021 Fascode Network.
#
# dmc
#
# LICENSE: THE SUSHI-WARE LICENSE
# https://github.com/MakeNowJust/sushi-ware
#
#
# 参考資料
# https://qiita.com/laikuaut/items/4bc07eabce56ee30812d
# https://qiita.com/t_nakayama0714/items/80b4c94de43643f4be51

script_usage(){
    echo "usage: dmc [options] [command]"
    echo
    echo "A simple tool for switching LightDM Greeters"
    echo
    echo " LightDM command:"
    echo "    autologin [username] [session]    Set up automatic login (with blank username to disable)"
    echo "    greeter                           Run greeter setup wizard"
    echo "    greeter-create [file]             Set the specified executable file as Greeter"
    echo "    greeter-change [greeter]          Specify the greeter to use"
    echo "    greeter-edit [greeter]            Edit the greeter configs"
    echo "    greeter-list                      Show a list of currently installed Greeters"
    echo "    remove                            Removes all changes made by this command"
    echo "    edit                              Edit lightdm config"
    echo "    show-config                       Show current settings"
    echo
    echo " GDM command:"
    echo "    autologin [username] [session]    Set up automatic login (with blank username to disable)"
    echo "    cursor                            Run cursor selection wizard"
    #echo "    cursor-change [cursor]            Specify the cursor theme"
    echo "    cursor-list                       Show a list of cursor theme"
    echo "    sound [true or false]             Toggle the sound when an event occurs"
    echo "    logo [image]                      Specify the logo of the login screen"
    echo "    tap [true or false]               Toggle whether to recognize the tap as a click"
    echo "    accessibility [true or false]     Toggle whether to show accessibility menu"
    echo "    root-login [true or false]        Toggle whether to enable root login"
    echo
    echo " Webkit2 command:"
    echo "    theme                             Run theme selection wizard"
    echo "    theme-change [theme]              Specify the theme"
    echo
    echo " Qtquick command:"
    echo "    back                              Specify the background image"
    echo
    echo " General option:"
    echo "    -m | --mode                       Specifiy the target you want to set"
    echo "    -e | --editer                     Specifiy the editor to use for editing"
    echo "    -h | --help                       This help message and exit"
    echo "    --non-interactive                 Run in non-interactive mode"
    echo "    --noroot                          No check root permission"
    echo "    --write-all-files                 Allows rewriting of all configuration files"
    echo
    echo " Supported modes:"
    echo "    Display managers: lightdm, gdm"
    echo "    LightDM greeters: webkit2, qtquick"
    echo
}

set -eu

# エラー
msg_error() {
    echo "${@}" 1>&2
}

# 警告
msg_warn() {
    echo "${@}" 1>&2
}

# rootチェック
check_root(){
    if [[ "${NOROOT}" = false ]] && (( "${UID}" != 0 )); then
        msg_error "You have to run as root"
        exit 1
    fi
}

# 数値チェック
check_int(){
    set +e
    #if (( "$(expr "${1}" + 1 >/dev/null 2>&1; printf "${?}")" < 2 )); then
    if printf "%s" "${1}" | grep -E "^[0-9]+$" 1>/dev/null 2>&1; then
        set -e
        return 0
    else
        set -e
        return 1
    fi
}

check_bool(){
    if [[ -n "${1}" ]] && { [[ "${1}" = "true" ]] ||[[ "${1}" = "false" ]]; }; then
        return 0
    else
        return 1
    fi
}

# crudini ラッパー
wrapper(){
    local _command="${1}"
    shift 1
    if which "${_command}" >/dev/null 2>&1; then
        $(which "${_command}") "${@}"
    else
        msg_error "${_command} was not found"
        exit 1
    fi
}

crudini(){
    wrapper crudini "${@}"
}

jq(){
    wrapper jq "${@}"
}


# カーソルテーマの一覧を取得
get_cursor_theme(){
    # カーソルテーマの一覧を取得
    # 参考: https://wiki.archlinux.jp/index.php/%E3%82%AB%E3%83%BC%E3%82%BD%E3%83%AB%E3%83%86%E3%83%BC%E3%83%9E
    # 参考: https://wiki.archlinux.jp/index.php/GDM
    #echo "Searching cursor themes..." 1>&2
    local _dir _cursor_theme_dir_list _find_cursor_dir_list=("/usr/share/icons" "${HOME}/.local/share/icons" "${HOME}/.icons")
    for _dir in "${_find_cursor_dir_list[@]}"; do
        if [[ -d "${_dir}" ]]; then
            while read -r line; do
                _cursor_theme_dir_list+=("${line}")
            done < <(find "${_dir}" -type d -name "cursors" -print0 | xargs -0 -i dirname {} | sort)
        fi
    done
    unset _dir _find_cursor_dir_list
    
    local _cursor_theme _cursor_theme_name _name
    for _cursor_theme in "${_cursor_theme_dir_list[@]}"; do
        _name="$(grep -E "^Name=" "${_cursor_theme}/cursor.theme" 2> /dev/null | sed "s|^Name=||g")"
        if [[ -z "${_name}" ]]; then
            _name="$(basename "${_cursor_theme}")"
        fi
        _cursor_theme_name+=("${_name}")
    done
    echo "${_cursor_theme_name[@]}"
}

# GTKテーマの一覧を取得
get_gtk_theme(){
    local _dir _find_theme_dir_list=("/usr/share/themes" "${HOME}/.local/share/themes" "${HOME}/.themes")
    for _dir in "${_find_theme_dir_list[@]}"; do
        if [[ -d "${_dir}" ]]; then
            while read -r line; do
                _gtk_theme_dir_list+=("${line}")
            done < <(find "${_dir}" -type d -name "gtk-*" -print0 | xargs -0 -i dirname {} | tr " " "\n" | sort | uniq)
        fi
    done

    local _theme_name
    for _dir in "${_gtk_theme_dir_list[@]}"; do
        _theme_name="$(crudini --get "${_dir}/index.theme" 'Desktop Entry' "Name" 2> /dev/null ;:)"
        if [[ -z "${_theme_name}" ]]; then
            continue
        else
            _gtk_theme_name_list+=("${_theme_name}")
        fi
    done
    
    printf "%s\n" "${_gtk_theme_name_list[@]}" | sort | uniq | tr "\n" " "
}

# 質問を行う関数
ask_question(){
    local _choice=("${@}")
    
}

#== LightDM用の汎用関数 ==#
# キーが設定されている設定ファイル
lightdm_get_source_file(){
    local key="${1}"
    local source_name="$(lightdm --show-config 2>&1 | grep -E "^[A-Z]  ${key}=" | cut -d ' ' -f 1)"
    local source_path="$(lightdm --show-config 2>&1 | grep -x -A "$(lightdm --show-config 2>&1 | wc -l)" "Sources:" | grep -xv "Sources" | grep -E "^${source_name}  " | sed "s|^${source_name}  ||g")"
    if [[ -n "${source_path}" ]]; then
        echo -n "${source_path}"
    else
        echo -n ""
    fi
}


# 設定ファイルの値を変更する
lightdm_set_config(){
    local key="${1}" value="${2}" file=${3-${DISPLAY_MANAGER_CONFIG["lightdm"]}}
    if [[ "${WRITE_ALL_FILES}" = true ]] && [[ -n "$(lightdm_get_source_file "${1}")" ]]; then
        crudini --set "$(lightdm_get_source_file "${1}")" 'Seat:*' "${key}" "${value}"
    else
        crudini --set "${file}" 'Seat:*' "${key}" "${value}"
    fi

    if [[ ! "$(lightdm_get_value "${key}")" = "${value}" ]]; then
        msg_error "Failed to change the setting value. A value has already been set for $(lightdm_get_source_file "${1}")"
        msg_error "lightdm-config does not manipulate other configuration files for safety. Comment out the settings in that file."
    fi
}

# 設定ファイルのキーを削除する
lightdm_remove_key(){
    local key="${1}" _config
    if grep -E "^ ?${key}.+" "${DISPLAY_MANAGER_CONFIG["lightdm"]}" 1>/dev/null 2>&1; then
        sed -i -r "s|^ ?${key} ?=.+||g" "${DISPLAY_MANAGER_CONFIG["lightdm"]}"
        sed -i '/^$/d' "${DISPLAY_MANAGER_CONFIG["lightdm"]}"
    fi
}

# 設定ファイルを作成
lightdm_init_configs(){
    check_root
    if [[ ! -f "${DISPLAY_MANAGER_CONFIG["lightdm"]}" ]]; then
        mkdir -p "$(dirname "${DISPLAY_MANAGER_CONFIG["lightdm"]}")"
        touch "${DISPLAY_MANAGER_CONFIG["lightdm"]}"
        echo "[Seat:*]" > "${DISPLAY_MANAGER_CONFIG["lightdm"]}"
    fi
}

# 現在設定されている値を取得する
lightdm_get_value(){
    local _current_value="$(lightdm --show-config 2>&1 | grep -E "^[A-Z]  ${1}=" | sed "s|^[A-Z]  ||g" | cut -d "=" -f "2")"
    if [[ "${_current_value}" ]]; then
        echo -n "${_current_value}"
        return 0
    else
        echo -n ""
        return 0
    fi
}

#== LightDM用コマンド ==#
# greeter-changeコマンド
command_lightdm_greeter_change() {
    # 引数チェック
    if [[ -z "${1}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify Greeter."
        script_usage
        exit 1
    fi

    # 指定されたGreeterが正しいか確認
    if ! printf "%s\n" "${LIGHTDM_GREETERS[@]}" | grep -x "${1}" > /dev/null 2>&2; then
        msg_error "The greeter (${1}) doesn't exist."
        exit 1
    else
        lightdm_set_config "greeter-session" "${1}"
    fi
}

# greeter-createコマンド
command_lightdm_greeter_create(){
    if [[ -z "${1}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify Greeter."
        script_usage
        exit 1
    fi
    if [[ ! -f "${1}" ]]; then
        msg_error "${1} does not exist."
        script_usage
        exit 1
    fi
    if [[ ! -x "${1}" ]]; then
        msg_error "hoge is not an executable file."
        script_usage
        exit 1
    fi

    local path="${1}"
    local filename="$(basename "${1}")"

    if [[ -f "/usr/share/xgreeters/${filename}.desktop" ]]; then
        msg_error "Greeter with the same name already exists."
        exit 1
    fi
    cat > "/usr/share/xgreeters/${filename}.desktop"  <<EOF
[Desktop Entry]
Name=LightDM custom Greeter ${filename}
Comment=LightDM Greeter
Exec=${path}
Type=Application
EOF
}

# greeter-listコマンド
command_lightdm_greeter_list() {
    echo "Available Lightdm greeter list:"
    local _greeter
    for _greeter in "${LIGHTDM_GREETERS[@]}"; do
        if [[ "${_greeter}" = "${LIGHTDM_CURRENT_GREETER}" ]]; then
            echo " * ${_greeter}"
        else
            echo "   ${_greeter}"
        fi
    done
}

# greeterコマンド
run_greeter_wizard(){
    # グリーターの数を確認
    if (( ${#LIGHTDM_GREETERS[@]} < 1 )); then
        msg_error "LightDM Greeter was not found."
        exit 1
    fi

    # 質問する
    local _c _greeter
    echo "Please select the greeter to use."
    for (( _c=1; _c<=${#LIGHTDM_GREETERS[@]}; _c++)); do
        _greeter="${LIGHTDM_GREETERS[$(( _c - 1 ))]}"
        if [[ "${_greeter}" = "${LIGHTDM_CURRENT_GREETER}" ]]; then
            echo " * ${_c}: ${_greeter}"
        else
            echo "   ${_c}: ${_greeter}"
        fi
        unset _greeter
    done
    echo -n "(1 ~ ${#LIGHTDM_GREETERS[@]}) > "
    read -r _input

    local _recall
    _recall(){
        echo "Please enter the correct value."
        run_greeter_wizard
        exit 0
    }

    # 回答を解析
    if check_int "${_input}"; then
        # 数字が入力された
        if (( 1 <= _input)) && (( _input <= ${#LIGHTDM_GREETERS[@]} )); then
            _greeter="${LIGHTDM_GREETERS[$(( _input - 1 ))]}"
        else
            _recall
        fi
    else
        # 文字が入力された
        if printf "%s\n" "${LIGHTDM_GREETERS[@]}" | grep -x "${_input}" 1>/dev/null 2>&1; then
            _greeter="${_input}"
        else
            _recall
        fi
    fi

    # 結果に応じて処理を実行
    if [[ -n "${_greeter}" ]]; then
        command_lightdm_greeter_change "${_greeter}"
    else
        run_greeter_wizard
        exit 0
    fi
    echo "Changed greeter to ${_greeter}"
}

# removeコマンド
command_lightdm_remove(){
    if [[ ! -f "${DISPLAY_MANAGER_CONFIG["lightdm"]}" ]]; then
        return 0
    else
        local _yes_or_no
        echo -ne "Are you sure you want to delete all settings?\nThis change is irreversible.\n (y or n) > "
        read -r -n 1 _yes_or_no
        if [[ "${_yes_or_no}" = "y" ]]; then
            mv "${DISPLAY_MANAGER_CONFIG["lightdm"]}" "${DISPLAY_MANAGER_CONFIG["lightdm"]}.disabled"
        fi
    fi
}

# greeter-edit
command_lightdm_greeter_edit(){
    if [[ "${NON_INTERACTIVE}" = true ]]; then
        msg_error "You cannot use this command in non-interactive mode."
        exit 1
    fi
    local _greeter="${1:-${LIGHTDM_CURRENT_GREETER}}"
    if [[ -z "${GREETER_CONFIG["${_greeter}"]+SET}" ]]; then
        msg_error "This Greeter is not currently supported."
        msg_error "Please report the problem here."
        msg_error "https://github.com/FascodeNet/lightdm-config/issues"
        exit 1
    else
        if [[ -z "${1}" ]] || [[ "${1}" = "" ]]; then
            msg_warn "Greeter was not specified. Open the currently configured Greeter configuration file."
            echo -n "(Enter to continue) > "
            read -r
        fi
        set -u
        bash -c "${USE_EDITOR} ${GREETER_CONFIG["${_greeter}"]}"
        exit
    fi
}

# edit
command_lightdm_edit(){
    if [[ "${NON_INTERACTIVE}" = true ]]; then
        msg_error "You cannot use this command in non-interactive mode."
        exit 1
    fi
    for _config in "${LIGHTDM_LOADED_CONFIG[@]}"; do
        echo -ne "Edit ${_config} ? (y or n)> "
        read -r -n 1 _yes_or_no
        echo
        if [[ "${_yes_or_no}" = "y" ]]; then
            bash -c "${USE_EDITOR} ${_config}"
        fi
    done
}

# autologin
command_lightdm_auto_login(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        # 既に自動ログインが設定されているかを確認
        local autologin_user="$(lightdm_get_value autologin-user)"
        if [[ -n "${autologin_user}" ]]; then
            # autologinを無効化
            for _autologin in "autologin-guest" "autologin-user" "autologin-user-timeout" "autologin-in-background" "autologin-session"; do
                remove_key "${_autologin}"
            done
            echo "Canceled automatic login of ${autologin_user}"
        fi
    else
        local autologin_user="${1}" autologin_session
        if [[ -v 2 ]]; then
            autologin_session="${2}"
        fi

        # ユーザーチェック
        if ! getent passwd "${autologin_user}" 1> /dev/null 2>&1; then
            echo "${autologin_user} is a non-existent user."
            exit 1
        fi

        # セッションを設定
        if [[ -z "${autologin_session+SET}" ]]; then
            if (( $(find "/usr/share/xsessions" -print0 -type f 2> /dev/null | xargs -0 -i basename {} | wc -l) <= 1 )); then
                autologin_session="$(find "/usr/share/xsessions" -print0 -type f 2> /dev/null | xargs -0 -i basename {} | sed 's|.desktop$||g')"
            elif [[ "${NON_INTERACTIVE}" = true ]]; then
                # 非対話モード
                # ~/.dmrcの値を設定します
                autologin_session="$(grep -E '^Session=' "${HOME}/.dmrc" 2> /dev/null | cut -d '=' -f 2)"
                if [[ -z "${autologin_session}" ]]; then
                    msg_error "Failed to set the session."
                    msg_error "Not specified and ~/.dmrc does not exist either."
                    exit 1
                fi
            else
                echo "Select the desktop session to autologin"
                local session
                for session in "/usr/share/xsessions/"*; do
                    echo "   ${session}"
                done
                echo -n "(session name) > "
                read -r session
                if [[ -f "/usr/share/xsessions/${session}.desktop" ]]; then
                    autologin_session="${session}"
                else
                    msg_error "Please enter the correct session name."
                    exit 1
                fi
            fi
        else
            # 既に値が設定済み
            if [[ ! -f "/usr/share/xsessions/${autologin_session}.desktop" ]]; then
                # 存在しないセッションが指定された場合
                msg_error "This is a session (${autologin_session}) that does not exist."
                exit 1
            fi
        fi

        # autologin グループを設定
        if ! getent group "autologin" 1> /dev/null 2>&1; then
            LANG=C groupadd -r "autologin"
        fi
        LANG=C gpasswd -a "${autologin_user}" "autologin"

        # 設定を書き込み
        lightdm_set_config "autologin-guest" "false"
        lightdm_set_config "autologin-user" "${autologin_user}"
        lightdm_set_config "autologin-user-timeout" "0"
        lightdm_set_config "autologin-in-background" "false"
        lightdm_set_config "autologin-session" "${autologin_session}"

        echo "${autologin_user} will automatically log in with ${autologin_session}"
    fi

}

# show-config
command_lightdm_show_config(){
   lightdm --show-config 2>&1 
}

#== GDM用の汎用関数 ==#
gdm_init_configs(){
    check_root
    if [[ ! -f "/etc/dconf/profile/gdm" ]]; then
        mkdir -p "/etc/dconf/profile"
        touch "/etc/dconf/profile/gdm"
        echo -e "user-db:user\nsystem-db:gdm\nfile-db:/usr/share/gdm/greeter-dconf-defaults" > "/etc/dconf/profile/gdm"
    fi

    local _file
    for _file in "${DISPLAY_MANAGER_CONFIG["gdm-dconf"]}" "${DISPLAY_MANAGER_CONFIG["gdm-custom"]}"; do
        if [[ ! -f "${_file}" ]]; then
            mkdir -p "$(dirname "${_file}")"
            touch "${_file}"
        fi
    done
}

# gdm_dconf_set_config <dconf path> <key> <value>
gdm_dconf_set_config(){
    if check_int "${3}" || check_bool "${3}"; then
        crudini --set "${DISPLAY_MANAGER_CONFIG["gdm-dconf"]}" "${1}" "${2}" "${3}"
    else
        crudini --set "${DISPLAY_MANAGER_CONFIG["gdm-dconf"]}" "${1}" "${2}" "\"${3}\""
    fi
    gdm_update
}

# gdm_dconf_get_value <dconf path> <key>
gdm_dconf_get_value(){
    dconf dump / | crudini --get - "${1}" "${2}"
}

# gdm_custom_get_value <section> <key>
gdm_custom_get_value(){
    crudini --get "${DISPLAY_MANAGER_CONFIG["gdm-custom"]}" "${1}" "${2}"
}

# gdm_custom_set_config <section> <key> <value>
gdm_custom_set_config(){
    if check_int "${3}" || check_bool "${3}"; then
        crudini --set "${DISPLAY_MANAGER_CONFIG["gdm-custom"]}" "${1}" "${2}" "${3}"
    else
        crudini --set "${DISPLAY_MANAGER_CONFIG["gdm-custom"]}" "${1}" "${2}" "\"${3}\""
    fi
    gdm_update
}

gdm_update(){
    dconf update
}


#== GDM用コマンド ==#
command_gdm_logo(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify the image of background"
        exit 1
    fi
    if [[ ! -f "${1}" ]]; then
        msg_error "${1} was not found."
        exit 1
    fi

    local _backgrounf_file="/usr/share/backgrounds/gdm/background"
    mkdir -p "$(dirname "${_backgrounf_file}")"
    cp "${1}" "${_backgrounf_file}"
    chmod 644 "${_backgrounf_file}"
    
    gdm_dconf_set_config "org/gnome/login-screen" "logo" "${_backgrounf_file}"
}

command_gdm_cursor_wizard(){
    # カーソル一覧を取得
    local cursor_themes
    while read -r line; do cursor_themes+=("${line}"); done < <(get_cursor_theme)

    # 一覧を生成
    local _c
    unset _cursor_theme
    echo "Please select the cursor theme to use."
    for (( _c=1; _c<=${#cursor_themes[@]}; _c++)); do
        _cursor_theme="${cursor_themes[$(( _c - 1 ))]}"
        echo "   ${_c}: ${_cursor_theme}"
        unset _cursor_theme
    done

    # 質問する
    local _input
    echo -n "(1 ~ ${#cursor_themes[@]}) > "
    read -r _input

    local _recall
    _recall(){
        echo "Please enter the correct value."
        command_gdm_cursor_wizard
        exit 0
    }

    # 回答を解析
    if check_int "${_input}"; then
        # 数字が入力された
        if (( 1 <= _input)) && (( _input <= ${#cursor_themes[@]} )); then
            _cursor_theme="${cursor_themes[$(( _input - 1 ))]}"
        else
            _recall
        fi
    else
        # 文字が入力された
        if printf "%s\n" "${cursor_themes[@]}" | grep -x "${_input}" 1>/dev/null 2>&1; then
            _cursor_theme="${_input}"
        else
            _recall
        fi
    fi

    if [[ -n "${_cursor_theme}" ]]; then
        command_gdm_cursor_change "${_cursor_theme}"
    else
        command_gdm_cursor_wizard
        exit 0
    fi
    echo "Changed cursor to ${_cursor_theme}"
}

command_gdm_cursor_change(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify the cursor theme"
        exit 1
    fi
    local cursor_themes
    while read -r line; do cursor_themes+=("${line}"); done < <(get_cursor_theme)
    if ! printf "%s\n" "${cursor_themes[@]}" | grep -x "${1}" 1>/dev/null 2>&1; then
        msg_error "The cursor theme (${1}) was not found"
        exit 1
    fi
    gdm_dconf_set_config "org/gnome/desktop/interface" "cursor-theme" "${1}"
}

command_gdm_sound(){
    local _arg="$(echo "${1-""}" | tr "[:upper:]" "[:lower:]")"
    if ! check_bool "${_arg}"; then
        msg_error "Please specify true or false"
        script_usage
        exit 1
    fi
    gdm_dconf_set_config "org/gnome/desktop/sound" "event-sounds" "${_arg}"
}

command_gdm_tap(){
    local _arg="$(echo "${1-""}" | tr "[:upper:]" "[:lower:]")"
    if ! check_bool "${_arg}"; then
        msg_error "Please specify true or false"
        script_usage
        exit 1
    fi
    gdm_dconf_set_config "org/gnome/desktop/peripherals/touchpad" "tap-to-click" "${_arg}"
}

# autologin
command_gdm_auto_login(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        # 既に自動ログインが設定されているかを確認
        local autologin="$(gdm_custom_get_value daemon AutomaticLoginEnable)"
        if [[ "${autologin}" = "True" ]]; then
            gdm_custom_set_config "daemon" "AutomaticLoginEnable" "False"
            echo "Canceled automatic login of $(gdm_custom_get_value "daemon" "AutomaticLogin")"
        fi
    else
        local autologin_user="${1}" autologin_session
        if [[ -v 2 ]]; then
            autologin_session="${2}"
        fi

        # ユーザーチェック
        if ! getent passwd "${autologin_user}" 1> /dev/null 2>&1; then
            echo "${autologin_user} is a non-existent user."
            exit 1
        fi

        # セッションを設定 (WayLandのセッションは現在サポートされていません)
        if [[ -z "${autologin_session+SET}" ]]; then
            if (( $(find "/usr/share/xsessions" -print0 -type f 2> /dev/null | xargs -0 -i basename {} | wc -l) <= 1 )); then
                autologin_session="$(find "/usr/share/xsessions" -print0 -type f 2> /dev/null | xargs -0 -i basename {} | sed 's|.desktop$||g')"
            elif [[ "${NON_INTERACTIVE}" = true ]]; then
                # 非対話モード
                # ~/.dmrcの値を設定します
                autologin_session="$(grep -E '^Session=' "${HOME}/.dmrc" 2> /dev/null | cut -d '=' -f 2)"
                if [[ -z "${autologin_session}" ]]; then
                    msg_error "Failed to set the session."
                    msg_error "Not specified and ~/.dmrc does not exist either."
                    exit 1
                fi
            else
                echo "Select the desktop session to autologin"
                local session
                for session in "/usr/share/xsessions/"*; do
                    echo "   $(basename "${session}" | sed "s|.desktop$||g")"
                done
                echo -n "(session name) > "
                read -r session
                if [[ -f "/usr/share/xsessions/${session}.desktop" ]]; then
                    autologin_session="${session}"
                else
                    msg_error "Please enter the correct session name."
                    exit 1
                fi
            fi
        else
            # 既に値が設定済み
            if [[ ! -f "/usr/share/xsessions/${autologin_session}.desktop" ]]; then
                # 存在しないセッションが指定された場合
                msg_error "This is a session (${autologin_session}) that does not exist."
                exit 1
            fi
        fi

        # autologin グループを設定
        if ! getent group "autologin" 1> /dev/null 2>&1; then
            LANG=C groupadd -r "autologin"
        fi
        LANG=C gpasswd -a "${autologin_user}" "autologin"

        # 設定を書き込み
        gdm_custom_set_config "daemon" "AutomaticLoginEnable" "True"
        gdm_custom_set_config "daemon" "AutomaticLogin" "${autologin_user}"
        
        # セッションを指定
        crudini --set "/var/lib/AccountsService/users/${autologin_user}" "User" "Session" "${autologin_session}"
        crudini --set "/var/lib/AccountsService/users/${autologin_user}" "User" "XSession" "${autologin_session}"

        echo "${autologin_user} will automatically log in with ${autologin_session}"
    fi

}

# accessibility コマンド
command_gdm_accessibility(){
    local _arg="$(echo "${1-""}" | tr "[:upper:]" "[:lower:]")"
    if ! check_bool "${_arg}"; then
        msg_error "Please specify true or false"
        script_usage
        exit 1
    fi
    gdm_dconf_set_config "org/gnome/desktop/interface" "toolkit-accessibility" "${_arg}"
}

# root-login コマンド
command_gdm_root_login(){
    local _arg="$(echo "${1-""}" | tr "[:upper:]" "[:lower:]")"
    if ! check_bool "${_arg}"; then
        msg_error "Please specify true or false"
        script_usage
        exit 1
    fi
    gdm_custom_set_config "daemon" "AllowRoot" "${_arg}"
}

#== Webkit2用の汎用関数 ==#
webkit2_init_configs(){
    check_root
    if [[ ! -f "${GREETER_CONFIG["lightdm-webkit2-greeter"]}" ]]; then
        mkdir -p "$(dirname "${GREETER_CONFIG["lightdm-webkit2-greeter"]}")"
        touch "${GREETER_CONFIG["lightdm-webkit2-greeter"]}"
    fi
}

# webkit2_get_value <section> <key>
webkit2_get_value(){
    crudini --get "${GREETER_CONFIG["lightdm-webkit2-greeter"]}" "${1}" "${2}"
}

# webkit2_set_config <section> <key> <value>
webkit2_set_config(){
    crudini --set "${GREETER_CONFIG["lightdm-webkit2-greeter"]}" "${1}" "${2}" "${3}"
}

#== webkit2用コマンド ==#
command_webkit2_theme_wizard(){
    local _theme_list
    while read -r line; do
        _theme_list+=("${line}")
    done < <(ls /usr/share/lightdm-webkit/themes)

    local _current_theme=$(webkit2_get_value greeter webkit_theme | sed "s|\"||g")
    local _theme _c
    echo "Please select the theme to use."
    for (( _c=1; _c<=${#_theme_list[@]}; _c++)); do
        _theme="${_theme_list[$(( _c - 1 ))]}"
        if [[ "${_theme}" = "${_current_theme}" ]]; then
            echo " * ${_c}: ${_theme}"
        else
            echo "   ${_c}: ${_theme}"
        fi
        unset _theme
    done

    # 質問する
    local _input
    echo -n "(1 ~ ${#_theme_list[@]}) > "
    read -r _input

    # shellcheck disable=SC2034
    local _recall
    _recall(){
        echo "Please enter the correct value."
        command_webkit2_theme_wizard
        exit 0
    }

    # 回答を解析
    if check_int "${_input}"; then
        # 数字が入力された
        if (( 1 <= _input)) && (( _input <= ${#_theme_list[@]} )); then
            _theme="${_theme_list[$(( _input - 1 ))]}"
        else
            _recall
        fi
    else
        # 文字が入力された
        if printf "%s\n" "${_theme_list[@]}" | grep -x "${_input}" 1>/dev/null 2>&1; then
            _theme="${_input}"
        else
            _recall
        fi
    fi

    if [[ -n "${_theme}" ]]; then
        command_webkit2_theme_change "${_theme}"
        echo "Changed the theme to ${_theme}"
    else
        command_webkit2_theme_wizard
        exit 0
    fi
    
}

command_webkit2_theme_change(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify the theme name"
        exit 1
    fi
    if [[ ! -d "/usr/share/lightdm-webkit/themes/${1}" ]]; then
        msg_error "The specified theme (${1}) does not exist"
        exit 1
    fi

    webkit2_set_config "greeter" "webkit_theme" "${1}"
}

#== Qtquick用の汎用関数 ==#
qtquick_init_configs(){
    check_root
    if [[ ! -f "${GREETER_CONFIG["lightdm-qtquick-greeter"]}" ]] || [[ -z "$(cat "${GREETER_CONFIG["lightdm-qtquick-greeter"]}")" ]]; then
        mkdir -p "$(dirname "${GREETER_CONFIG["lightdm-qtquick-greeter"]}")"
        touch "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
        #echo -e "{\n\n}\n" > "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
        qtquick_set_config background_path "file:///hoge/fuga.png"
        qtquick_set_config theme "qrc:/Login.qml"
    fi
}

#qtquick_get_value <key>
qtquick_get_value(){
    jq ".${1}" < "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
}

# command_qtquick_back <key> <value>
qtquick_set_config(){
    local _tempfile="/tmp/$(basename "${GREETER_CONFIG["lightdm-qtquick-greeter"]}")-$(base64 < "/dev/urandom" | fold -w 10 | head -n 1)"
    cp "${GREETER_CONFIG["lightdm-qtquick-greeter"]}" "${_tempfile}"
    #cat "${_tempfile}" | jq -r ".${1}|=\"${2}\"" > "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
    jq -r ".${1}|=\"${2}\"" < "${_tempfile}" > "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
    chmod 644 "${GREETER_CONFIG["lightdm-qtquick-greeter"]}"
}

#== Qtquick用コマンド ==#
command_qtquick_back(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify the image of background"
        exit 1
    fi
    if [[ ! -f "${1}" ]]; then
        msg_error "${1} was not found."
        exit 1
    fi

    local _backgrounf_file="/usr/share/backgrounds/lightdm/qtquick-greeter"
    mkdir -p "$(dirname "${_backgrounf_file}")"
    cp "${1}" "${_backgrounf_file}"
    chmod 644 "${_backgrounf_file}"
    
    qtquick_set_config "background_path" "file://${_backgrounf_file}"
}

#== slick用の汎用関数 ==#
slick_get_value(){
    crudini --get "${GREETER_CONFIG["slick"]}" "Greeter" "${1}"
}

slick_set_config(){
    crudini --set "${GREETER_CONFIG["slick"]}" "Greeter" "${1}" "${2}"
}

slick_init_configs(){
    check_root
    if [[ -f "${GREETER_CONFIG["slick"]}" ]]; then
        mkdir -p "$(dirname "${GREETER_CONFIG["slick"]}")"
        touch "${GREETER_CONFIG["slick"]}"
        echo "[Greeter]" > "${GREETER_CONFIG["slick"]}"
    fi
}

command_slick_grid(){
    local _arg="$(echo "${1-""}" | tr "[:upper:]" "[:lower:]")"
    if ! check_bool "${_arg}"; then
        msg_error "Please specify true or false"
        script_usage
        exit 1
    fi
    slick_set_config "draw-grid" "${_arg}"
}

command_slick_back(){
    if [[ -z "${1+SET}" ]] || [[ "${1}" = "" ]]; then
        msg_error "Please specify the image of background"
        exit 1
    fi
    if [[ ! -f "${1}" ]]; then
        msg_error "${1} was not found."
        exit 1
    fi

    local _backgrounf_file="/usr/share/backgrounds/lightdm/slick-greeter"
    mkdir -p "$(dirname "${_backgrounf_file}")"
    cp "${1}" "${_backgrounf_file}"
    chmod 644 "${_backgrounf_file}"
    
    slick_set_config "background" "${_backgrounf_file}"
}


command_slick_theme_wizard(){
    local gtk_themes
    while read -r line; do gtk_themes+=("${line}"); done < <(get_gtk_theme)


}


# 変数を設定
declare -A GREETER_CONFIG=(
    ["lightdm-webkit2-greeter"]="/etc/lightdm/lightdm-webkit2-greeter.conf"
    ["lightdm-slick-greeter"]="/etc/lightdm/slick-greeter.conf"
    ["lightdm-gtk-greeter"]="/etc/lightdm/lightdm-gtk-greeter.conf"
    ["io.elementary.greeter"]="/etc/lightdm/io.elementary.greeter.conf"
    ["lightdm-mini-greeter"]="/etc/lightdm/lightdm-mini-greeter.conf"
    ["lightdm-qtquick-greeter"]="/etc/lightdm/lightdm-qtquick-greeter.json"
)

declare -A DISPLAY_MANAGER_CONFIG=(
    ["lightdm"]="/etc/lightdm/lightdm.conf.d/00-dmc-lightdm.conf"
    ["gdm-dconf"]="/etc/dconf/db/gdm.d/00-dmc-gdm"
    ["gdm-custom"]="/etc/gdm/custom.conf"
)


#== CONFIGS ==#

# LightDM - Greeterのディレクトリ
LIGHTDM_GREETERS_DIR="$(lightdm_get_value "greeters-directory")"
: "${LIGHTDM_GREETERS_DIR:="/usr/share/xgreeters"}"

# LightDM - Greeter一覧
#LIGHTDM_GREETERS=( $( )
while read -r line; do
    LIGHTDM_GREETERS+=("${line}")
done < <( (find "${LIGHTDM_GREETERS_DIR}" -print0 -type f | xargs -0 -i basename {} | sed "s|.desktop$||g") 2> /dev/null )

# LightDM - 現在設定されているGreeter
LIGHTDM_CURRENT_GREETER="$(lightdm --show-config 2>&1 | grep "greeter-session" | cut -d "=" -f 2)"
: "${LIGHTDM_CURRENT_GREETER:="lightdm-gtk-greeter"}"

# LightDM - 読み込まれた設定ファイルの一覧
while read -r line; do
    LIGHTDM_LOADED_CONFIG+=("${line}")
done < <(printf "%s\n" "$(lightdm --show-config 2>&1 | grep -x -A "$(lightdm --show-config 2>&1 | wc -l)" "Sources:" | grep -v "Sources" | sed 's|^[A-Z]  ||g')"  | tr -d " ")

# Global - エディタ
USE_EDITOR="${EDITOR:-vi}"

# モード
DISPLAY_MANAGER="$(basename "$(readlink "/etc/systemd/system/display-manager.service")" | sed "s|.service$||g")"
: "${DISPLAY_MANAGER:="lightdm"}"

# dmc config
NON_INTERACTIVE=false
WRITE_ALL_FILES=false
NOROOT=false


#== 引数解析 ==#
ARGUMENT="${*}"
OPTS="m:e:h"
OPTL="mode:,editor:,help,non-interactive,noroot,write-all-files"
# shellcheck disable=SC2086
if ! OPT="$(getopt -o ${OPTS} -l ${OPTL} -- ${ARGUMENT})"; then
    exit 1
fi

eval set -- "${OPT}"
unset OPT OPTS OPTL

while true; do
    case "${1}" in
        -m | --mode)
            DISPLAY_MANAGER="${2}"
            shift 2
            ;;
        -e | --editor)
            USE_EDITOR="${2}"
            shift 2
            ;;
        -h | --help)
            script_usage
            exit 0
            ;;
        --non-interactive)
            NON_INTERACTIVE=true
            shift 1
            ;;
        --noroot)
            NOROOT=true
            shift 1
            ;;
        --write-all-files)
            WRITE_ALL_FILES=true
            shift 1
            ;;
        --)
            shift 1
            break
            ;;
    esac
done

COMMAND="${1:-null}"
if (( "${#}" >= 1 )); then
    shift 1
fi
COMMAND_ARGS="${*}"
: "${COMMAND_ARGS-""}" # サブコマンドの引数が何も指定されなかった場合に空文字を代入

if [[ "${COMMAND}" = "null" ]]; then
    script_usage
    exit 1
fi

case "${DISPLAY_MANAGER}" in
    "lightdm")
        case "${COMMAND}" in
            "autologin")
                lightdm_init_configs
                command_lightdm_auto_login "${COMMAND_ARGS}"
                ;;
            "greeter")
                lightdm_init_configs
                run_greeter_wizard
                ;;
            "greeter-change")
                lightdm_init_configs
                command_lightdm_greeter_change "${COMMAND_ARGS}"
                ;;
            "greeter-create")
                lightdm_init_configs
                command_lightdm_greeter_create "${COMMAND_ARGS}"
                ;;
            "greeter-list")
                command_lightdm_greeter_list
                ;;
            "greeter-edit")
                check_root
                command_lightdm_greeter_edit "${COMMAND_ARGS}"
                ;;
            "remove")
                check_root
                command_lightdm_remove
                ;;
            "edit")
                check_root
                command_lightdm_edit
                ;;
            "show-config")
                command_lightdm_show_config
                ;;
            *)
                msg_error "Undefined commnad(${COMMAND})"
                ;;
        esac
        ;;
    "gdm")
        case "${COMMAND}" in
            "autologin")
                gdm_init_configs
                command_gdm_auto_login "${COMMAND_ARGS}"
                ;;
            "cursor")
                gdm_init_configs
                command_gdm_cursor_wizard
                ;;
            "sound")
                gdm_init_configs
                command_gdm_sound "${COMMAND_ARGS}"
                ;;
            "logo")
                gdm_init_configs
                command_gdm_logo "${COMMAND_ARGS}"
                ;;
            "tap")
                gdm_init_configs
                command_gdm_tap "${COMMAND_ARGS}"
                ;;
            "accessibility")
                gdm_init_configs
                command_gdm_accessibility "${COMMAND_ARGS}"
                ;;
            "root-login")
                gdm_init_configs
                command_gdm_root_login "${COMMAND_ARGS}"
                ;;
            *)
                msg_error "Undefined commnad(${COMMAND})"
                ;;
        esac
        ;;
    "webkit2")
        case "${COMMAND}" in
            "theme")
                webkit2_init_configs
                command_webkit2_theme_wizard
                ;;
            "theme-change")
                webkit2_init_configs
                command_webkit2_theme_change "${COMMAND_ARGS}"
                ;;
            *)
                msg_error "Undefined commnad(${COMMAND})"
                ;;
        esac
        ;;
    "qtquick")
        case "${COMMAND}" in
            "back")
                qtquick_init_configs
                command_qtquick_back "${COMMAND_ARGS}"
                ;;
        esac
        ;;
    "slick")
        case "${COMMAND}" in
            "back")
                slick_init_configs
                command_slick_back "${COMMAND_ARGS}"
                ;;
            "grid")
                slick_init_configs
                command_slick_grid "${COMMAND_ARGS}"
                ;;
            "icon")
                slick_init_configs
                command_slick_icon_wizard
                ;;
            "theme")
                slick_init_configs
                command_slick_theme_wizard
                ;;
            "other-monitor")
                slick_init_configs
                command_slick_other_monitor "${COMMAND_ARGS}"
                ;;
            "logo")
                slick_init_configs
                command_slick_logo "${COMMAND_ARGS}"
                ;;
        esac
        ;;
    *)
        msg_error "A display manager that is not currently supported."
        exit 1
        ;;
esac
exit 0