#!/bin/sh
set -e

REPO="ramc10/shunt"
BIN="shunt"
INSTALL_DIR="${INSTALL_DIR:-$HOME/.local/bin}"

# Detect OS and arch
OS="$(uname -s)"
ARCH="$(uname -m)"

case "$OS" in
  Linux)
    case "$ARCH" in
      x86_64)  TARGET="x86_64-unknown-linux-gnu" ;;
      aarch64) TARGET="aarch64-unknown-linux-gnu" ;;
      arm64)   TARGET="aarch64-unknown-linux-gnu" ;;
      *) echo "Unsupported architecture: $ARCH" >&2; exit 1 ;;
    esac
    ;;
  Darwin)
    case "$ARCH" in
      arm64)  TARGET="aarch64-apple-darwin" ;;
      x86_64) echo "Intel Mac binaries are not provided. Install Rust and run: cargo install shunt-proxy" >&2; exit 1 ;;
      *) echo "Unsupported architecture: $ARCH" >&2; exit 1 ;;
    esac
    ;;
  *) echo "Unsupported OS: $OS" >&2; exit 1 ;;
esac

# Fetch latest release version
echo "Fetching latest release..."
VERSION="$(curl -fsSL "https://api.github.com/repos/$REPO/releases/latest" \
  | grep '"tag_name"' | sed 's/.*"tag_name": *"\(.*\)".*/\1/')"

if [ -z "$VERSION" ]; then
  echo "Could not determine latest version." >&2
  exit 1
fi

ARCHIVE="shunt-${VERSION}-${TARGET}.tar.gz"
URL="https://github.com/$REPO/releases/download/$VERSION/$ARCHIVE"

# Download and extract
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

echo "Downloading $BIN $VERSION for $TARGET..."
curl -fsSL "$URL" -o "$TMP/$ARCHIVE"
tar -xzf "$TMP/$ARCHIVE" -C "$TMP"

# Install binary
mkdir -p "$INSTALL_DIR"
cp "$TMP/shunt-${VERSION}-${TARGET}/$BIN" "$INSTALL_DIR/$BIN"
chmod +x "$INSTALL_DIR/$BIN"

# macOS: remove quarantine and ad-hoc sign so Gatekeeper allows unsigned binaries
if [ "$OS" = "Darwin" ]; then
  xattr -d com.apple.quarantine "$INSTALL_DIR/$BIN" 2>/dev/null || true
  codesign --force --deep --sign - "$INSTALL_DIR/$BIN" 2>/dev/null || true
fi

echo ""
echo "Installed $BIN $VERSION to $INSTALL_DIR/$BIN"

# Check if INSTALL_DIR is on PATH
case ":$PATH:" in
  *":$INSTALL_DIR:"*) ;;
  *)
    echo ""
    echo "Add to your PATH:"
    echo "  export PATH=\"\$PATH:$INSTALL_DIR\""
    echo ""
    echo "Or add that line to your ~/.zshrc / ~/.bashrc"
    ;;
esac