#

# Prompts user to pick version of Factorio.

#

# Arguments:

#

#   $1 (game_installations_directory)

#     Path to directory containing Factorio installations.

#

#   $2 (default_version, optional)

#     Default version to fill-in for the user. If not set, last

#     version in the directory (sorted alphabetically) will be used.

#

#   $3 (default_marker, optional)

#     Marker text to use for the default version. Default is "default".

#

# Returns:

#

#   0 if version was successfully selected, 1 otherwise.

#

# Sets:

#

#   game_version_selected

#

function select_factorio_version() {

    local game_installations_directory="$1"

    local default_version="${2-}"

    local default_marker="${3-default}"

    local game_versions_available=()

    local candidate

    local i default_option selected_option

    declare -g game_version_selected=""

    # Grab a list of available versions.

    for candidate in "$game_installations_directory"/*; do

        if [[ -f $candidate/bin/x64/factorio ]]; then

            game_versions_available+=( "$(basename "$candidate")" )

        fi

    done

    if [[ ${#game_versions_available[@]} == 0 ]]; then

        error "Could not find any Factorio installations under directory '$game_installations_directory'."

        error "Please unpack Factorio installations into the directory, or use set-game-dir command to specify directory with Factorio installations."

        return 1

    fi

    echo "The following versions of Factorio are locally available:"

    echo

    for i in "${!game_versions_available[@]}"; do

        let i++

        echo -n "  [$i] $(basename "${game_versions_available[$i-1]}")"

        # Highlight default version.

        if [[ -z $default_version && $i == ${#game_versions_available[@]} ]] || \

               [[ -n $default_version && ${game_versions_available[i-1]} == $default_version ]]; then

            colorecho boldgreen " [$default_marker]"

            default_option="$i"

        else

            echo

        fi

    done

    echo

    while [[ -z $game_version_selected ]]; do

        read -e -p "Please specify what version you would like to use (enter for $default_marker): " selected_option

        [[ -z $selected_option ]] && selected_option="$default_option"

        if [[ $selected_option =~ ^[[:digit:]]+$ ]] && (( $selected_option >= 1 && $selected_option <= ${#game_versions_available[@]} )); then

            game_version_selected="${game_versions_available[$selected_option-1]}"

        else

            error "Invalid option selected, please try again."

            echo

        fi

    done

    return 0

}

    select_factorio_version "$game_installations_directory" || exit "$ERROR_GENERAL"