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

VERSION=${VERSION:-${1:?Provide VERSION env or arg, e.g. VERSION=1.0.0 bash grokkit-install.sh}}

GITEA_BASE=https://repos.gmgauthier.com/gmgauthier/grokkit

# Detect platform
OS=$(uname -s | tr '[:upper:]' '[:lower:]')
case "$OS" in
  linux) OS=linux ;;
  darwin) OS=darwin ;;
esac

ARCH=$(uname -m)
case "$ARCH" in
  x86_64|amd64) ARCH=amd64 ;;
  arm64|aarch64) ARCH=arm64 ;;
esac

ASSET="grokkit-${OS}-${ARCH}-${VERSION}.tar.gz"

echo "Installing grokkit ${VERSION} for ${OS}/${ARCH}..."

TEMP_DIR=$(mktemp -d)
trap "rm -rf \"${TEMP_DIR}\"" EXIT

cd "${TEMP_DIR}"

# Download
curl -fL "${GITEA_BASE}/releases/download/v${VERSION}/${ASSET}" -o asset.tar.gz
curl -fL "${GITEA_BASE}/releases/download/v${VERSION}/checksums.txt" -o checksums.txt

# Verify checksum
HASH=$(grep " ${ASSET}$" checksums.txt | cut -d " " -f1)
echo "${HASH}  asset.tar.gz" | shasum -a 256 --check - || { echo "Checksum mismatch!"; exit 1; }

# Extract
tar xzf asset.tar.gz
BINARY="grokkit"

# Install
INSTALL_DIR="${HOME}/.local/bin"
mkdir -p "${INSTALL_DIR}"
mv "${BINARY}" "${INSTALL_DIR}/grokkit"
chmod +x "${INSTALL_DIR}/grokkit"

echo "✅ grokkit ${VERSION} installed to ${INSTALL_DIR}/grokkit"
echo "Add to PATH if needed: export PATH=\"${INSTALL_DIR}:\$PATH\""
grokkit version