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

USER_NAME="$(id -un)"

USER_HOME="$(getent passwd "$USER_NAME" | cut -d: -f6)"
[ -z "$USER_HOME" ] && USER_HOME="$HOME"

DEFAULT_VERSION="22"
BASE_DIR="/opt/cpguard/node/versions"
VERSION_FILE="${USER_HOME}/.cpguard/node-version"

REQ_VERSION="$DEFAULT_VERSION"

if [ -r "$VERSION_FILE" ]; then
    read -r REQ_VERSION < "$VERSION_FILE" || true
fi

# Remove CRLF and whitespace
REQ_VERSION="$(printf '%s' "$REQ_VERSION" | tr -d '\r\n[:space:]')"

# Validate version string
case "$REQ_VERSION" in
    *[!0-9.]*|'')
        REQ_VERSION="$DEFAULT_VERSION"
        ;;
esac

# Runtime directories are stored by major version:
# /opt/cpguard/node/versions/20
# /opt/cpguard/node/versions/22
# /opt/cpguard/node/versions/24
MAJOR_VERSION="${REQ_VERSION%%.*}"

TARGET_DIR="${BASE_DIR}/${MAJOR_VERSION}"

NODE_BINARY="${TARGET_DIR}/bin/node"
NPM_CLI="${TARGET_DIR}/lib/node_modules/npm/bin/npm-cli.js"

if [ ! -d "$TARGET_DIR" ]; then
    echo "[cPGuard X] Node major version '${MAJOR_VERSION}' not found." >&2
    exit 1
fi

if [ ! -x "$NODE_BINARY" ]; then
    echo "[cPGuard X] Node binary not found: ${NODE_BINARY}" >&2
    exit 1
fi

if [ ! -f "$NPM_CLI" ]; then
    echo "[cPGuard X] npm not found for Node major '${MAJOR_VERSION}'." >&2
    exit 1
fi

# Per-user npm global directory
export NPM_CONFIG_PREFIX="${USER_HOME}/.npm-global"

# Selected Node version comes first
export PATH="${TARGET_DIR}/bin:${USER_HOME}/.npm-global/bin:${PATH}"

# Run npm using selected Node binary
exec "$NODE_BINARY" "$NPM_CLI" "$@"