function error_exit() {
    echo "Error: $1"
    exit 1
}

function assert_defined() {
    local variable_name=$1
    if [[ ! ${!variable_name} ]]; then
        error_exit "$variable_name is not defined"
    fi
}

network_config_file=./network.cfg

if [[ ! -f ${network_config_file} ]]; then
    error_exit "$network_config_file does not exist"
fi
source ${network_config_file}

assert_defined "machine_domain"
assert_defined "node_count"
assert_defined "ssh_user"
assert_defined "node_network_dir"
assert_defined "chain_id"
assert_defined "p2p_port"

# Hack until we fix PATH for remote sessions
so_command=/home/laconic/bin/laconic-so

# run_on_all_nodes(machine_name_prefix, command_to_run)
function run_on_all_nodes() {
    local machine_name_prefix=$1
    local command_to_run=$2
    for (( i=1 ; i<=$node_count ; i++ ));
    do
        local machine_name=${machine_name_prefix}-${i}.${machine_domain}
        echo "${machine_name}:"
        echo "Running: ${command_to_run}"
        ssh ${ssh_user}@${machine_name} ${command_to_run}
    done
}

function change_dir_ownership() {
    local machine_name=$1
    local directory_path=$2
    local command_to_run="sudo chown \$USER: -R ${directory_path}"
    echo "Running: ${command_to_run} on ${machine_name}"
    ssh ${ssh_user}@${machine_name} ${command_to_run}
}