#!/bin/sh

OVERRIDE_VARS="PATH LDPATH"

if [ -z $XDG_DATA_HOME ]; then
    ENV_DIR="$HOME/.local/share/ves/envs"
else
    ENV_DIR="$XDG_DATA_HOME/ves/envs"
fi

check_name() {
    if [ -f "$ENV_DIR/$1" ]; then
        printf "ERROR: Environment [%s] already exists.\n" $1 > /dev/stderr
        exit 1
    fi

    if ! echo $1 | grep "^[[:alpha:][:digit:]_-]*$" > /dev/null; then
        printf "ERROR: Environment [%s] is invalid. Name must contain only letters, -, and _\n" $1 > /dev/stderr
        exit 1
    fi
}


create_env() {
    FILE="$ENV_DIR/$1"
    printf "name: $1\n" > $FILE

    if [ "$OVERRIDE" -eq "1" ]; then
        for VAR in $OVERRIDE_VARS; do
            printf "export_var:%s=%s\n" $VAR '""' >> $FILE
        done
    fi
}

OVERRIDE=0
while :; do
    case $1 in
        --override)
            OVERRIDE=1
            ;;
        --)
            shift
            break
            ;;
        -?*)
            printf "ERROR: Invalid option [%s]\n" $1 > /dev/stderr
            exit 2
            ;;
        *)
            break
    esac
    shift
done
ENV_NAME="$1"

echo $ENV_NAME
echo $OVERRIDE

check_name "$1"
create_env "$1" "$OVERRIDE"

printf "Environment [%s] created successfully\n" $ENV_NAME
printf "To activate, execute\nves activate %s\n" $ENV_NAME