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#!/bin/sh -pe
#
# updates the ~/.pam_environment config file

homedir=$1
locale_name=$2
language_list=$3

[ -n "$homedir" -a -n "$locale_name" ] || exit 1

langtoolsdir=/usr/share/language-tools

# create ~/.pam_environment if it doesn't exist
touch "$homedir/.pam_environment" || exit 1

is_valid_pam_value() {
    case "$1" in
        ''|*[!abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.@:+-]*)
            return 1
            ;;
        *)
            return 0
            ;;
    esac
}

save_to_pam_env() {
    var=$1; value=$2
    case "$var" in
        ''|*[!abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]*)
            exit 1
            ;;
    esac
    is_valid_pam_value "$value" || exit 1

    temp=$(mktemp '.pam_environment.XXXXXXXX') || exit 1

    if awk -v var="$var" -v value="$value" '
        BEGIN { replaced = 0; pattern = "^" var "([[:space:]]+DEFAULT|=)" }
        $0 ~ pattern {
            if (!replaced)
                print var "\tDEFAULT=" value
            replaced = 1
            next
        }
        { print }
        END {
            if (!replaced)
                print var "\tDEFAULT=" value
        }
    ' .pam_environment > "$temp"; then
        mv "$temp" .pam_environment
    else
        rm -f "$temp"
        exit 1
    fi
}

cd "$homedir"
if [ -n "$language_list" ]; then
    save_to_pam_env 'LANGUAGE' "$language_list"
    save_to_pam_env 'LANG' "$locale_name"
else
    for var in 'LC_NUMERIC' 'LC_TIME' 'LC_MONETARY' 'LC_PAPER' 'LC_NAME' \
               'LC_ADDRESS' 'LC_TELEPHONE' 'LC_MEASUREMENT' 'LC_IDENTIFICATION'; do
        save_to_pam_env "$var" "$locale_name"
    done
    papersize=$( "$langtoolsdir/locale2papersize" "$locale_name" )
    save_to_pam_env 'PAPERSIZE' "$papersize"
    printf '%s\n' "$locale_name"
fi

exit 0