#!/bin/sh
# update-cpd-cli.sh — Download and install the latest (or specified) cpd-cli release.
# Compatible with sh, bash, and zsh.
#
# Usage:
#   sudo ./update-cpd-cli.sh              # auto-detect latest release
#   sudo ./update-cpd-cli.sh 14.3.1       # install a specific version
#
# Assumes: curl, tar, and write access to INSTALL_DIR (run with sudo).

set -eu

# ---------- configuration ----------
INSTALL_DIR="/usr/local/bin"
WORK_DIR="${TMPDIR:-/tmp}/cpd-cli-update-$$"
GITHUB_REPO="IBM/cpd-cli"
SYMLINKS="cpd-cli LICENSES plugins"
# ------------------------------------

cleanup() { rm -rf "$WORK_DIR"; }
trap cleanup EXIT

die() { printf "ERROR: %s\n" "$1" >&2; exit 1; }

# ---------- resolve version ----------
if [ $# -ge 1 ]; then
    VERSION="$1"
else
    printf "Detecting latest cpd-cli release... "
    VERSION=$(curl -fsSL -o /dev/null -w '%{url_effective}' \
        "https://github.com/${GITHUB_REPO}/releases/latest" \
        | grep -oE '[0-9]+\.[0-9]+\.[0-9]+$') \
        || die "Could not determine latest version. Specify one manually: $0 <version>"
    printf "%s\n" "$VERSION"
fi

TARBALL="cpd-cli-linux-EE-${VERSION}.tgz"
URL="https://github.com/${GITHUB_REPO}/releases/download/v${VERSION}/${TARBALL}"

# ---------- download ----------
mkdir -p "$WORK_DIR"
printf "Downloading %s ...\n" "$URL"
curl -fSL -o "${WORK_DIR}/${TARBALL}" "$URL" || die "Download failed. Check the version number."

# ---------- extract ----------
printf "Extracting... "
tar xzf "${WORK_DIR}/${TARBALL}" -C "$WORK_DIR"
EXTRACTED=$(find "$WORK_DIR" -maxdepth 1 -type d -name "cpd-cli-linux-EE-*" | head -1)
[ -n "$EXTRACTED" ] || die "Could not find extracted directory in ${WORK_DIR}."
DIR_NAME=$(basename "$EXTRACTED")
printf "%s\n" "$DIR_NAME"

# ---------- check for no-op ----------
if [ -d "${INSTALL_DIR}/${DIR_NAME}" ]; then
    printf "Directory %s/%s already exists. " "$INSTALL_DIR" "$DIR_NAME"
    printf "Re-linking anyway.\n"
else
    printf "Installing to %s/%s ...\n" "$INSTALL_DIR" "$DIR_NAME"
    mv "$EXTRACTED" "$INSTALL_DIR/"
fi

# ---------- update symlinks ----------
printf "Updating symlinks in %s ...\n" "$INSTALL_DIR"
for link in $SYMLINKS; do
    target="${INSTALL_DIR}/${link}"
    if [ -L "$target" ]; then
        rm "$target"
    elif [ -e "$target" ]; then
        die "${target} exists and is not a symlink — refusing to overwrite."
    fi
    ln -s "${DIR_NAME}/${link}" "$target"
    printf "  %s -> %s/%s\n" "$link" "$DIR_NAME" "$link"
done

# ---------- verify ----------
printf "\nInstalled:\n"
cpd-cli version

printf "\nDone.\n"