#!/usr/bin/env bash
set -euo pipefail

LOCALE="en_US.UTF-8"

echo "==> Checking OS..."
if [ ! -f /etc/os-release ]; then
    echo "Unsupported OS"
    exit 1
fi

echo "==> Installing locales package..."
if command -v apt >/dev/null 2>&1; then
    sudo apt update
    sudo apt install -y locales
else
    echo "This script currently supports Debian/Ubuntu only"
    exit 1
fi

echo "==> Enabling locale ${LOCALE}..."
sudo sed -i "s/^# *${LOCALE}/${LOCALE}/" /etc/locale.gen

echo "==> Generating locale..."
sudo locale-gen "${LOCALE}"

echo "==> Setting system default locale..."
sudo update-locale LANG="${LOCALE}" LC_ALL="${LOCALE}"

echo "==> Applying locale immediately for current session..."
export LANG="${LOCALE}"
export LC_ALL="${LOCALE}"

echo "==> Current locale:"
locale

echo "==> Done. You may need to re-login or reboot for full effect."