#!/bin/sh
# Mottainai CLI installer
# Usage: curl -sSfL mottainai.app/cli/install.sh | sh
set -eu

BINARY="mo"
REPO="gukosowa/mottainai-cli"
INSTALL_DIR="${INSTALL_DIR:-/usr/local/bin}"
USER_INSTALL_DIR="${HOME}/.local/bin"

# ---------- detect OS ----------
OS="$(uname -s)"
case "$OS" in
  Darwin) OS="darwin" ;;
  Linux)  OS="linux" ;;
  *)
    echo "Unsupported OS: $OS" >&2
    exit 1
    ;;
esac

# ---------- detect arch ----------
ARCH="$(uname -m)"
case "$ARCH" in
  x86_64 | amd64)   ARCH="amd64" ;;
  arm64 | aarch64)  ARCH="arm64" ;;
  *)
    echo "Unsupported architecture: $ARCH" >&2
    exit 1
    ;;
esac

echo "Detecting platform: ${OS}/${ARCH}"

# ---------- resolve latest version ----------
LATEST_URL="https://github.com/${REPO}/releases/latest"
VERSION="$(curl -sSfL -o /dev/null -w '%{url_effective}' "$LATEST_URL" \
  | sed 's|.*/tag/||')"

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

echo "Downloading ${BINARY} ${VERSION}..."

# ---------- download + extract ----------
TARBALL="${BINARY}_${VERSION}_${OS}_${ARCH}.tar.gz"
URL="https://github.com/${REPO}/releases/download/${VERSION}/${TARBALL}"

TMP="$(mktemp -d)"
# shellcheck disable=SC2064
trap "rm -rf '$TMP'" EXIT

curl -sSfL "$URL" -o "${TMP}/${TARBALL}"
tar -xzf "${TMP}/${TARBALL}" -C "$TMP"

if [ ! -f "${TMP}/${BINARY}" ]; then
  echo "Error: binary not found in archive" >&2
  exit 1
fi

chmod +x "${TMP}/${BINARY}"

# ---------- install ----------
TARGET_DIR="$INSTALL_DIR"

ensure_writable_dir() {
  target="$1"
  if ! mkdir -p "$target" 2>/dev/null; then
    return 1
  fi
  probe="${target}/.${BINARY}-write-check-$$"
  if ! : >"$probe" 2>/dev/null; then
    return 1
  fi
  rm -f "$probe"
  return 0
}

if ! ensure_writable_dir "$TARGET_DIR"; then
  if [ "$INSTALL_DIR" != "/usr/local/bin" ]; then
    echo "Install directory is not writable: ${INSTALL_DIR}" >&2
    exit 1
  fi

  echo "No write access to ${INSTALL_DIR}; using ${USER_INSTALL_DIR}."
  if ! ensure_writable_dir "$USER_INSTALL_DIR"; then
    echo "User install directory is not writable: ${USER_INSTALL_DIR}" >&2
    exit 1
  fi
  TARGET_DIR="$USER_INSTALL_DIR"
fi

mv "${TMP}/${BINARY}" "${TARGET_DIR}/${BINARY}"

echo "✓ Installed ${BINARY} to ${TARGET_DIR}/${BINARY}"
if [ "$TARGET_DIR" = "$USER_INSTALL_DIR" ]; then
  case ":$PATH:" in
    *":${USER_INSTALL_DIR}:"*) ;;
    *)
      echo ""
      echo "Add ${USER_INSTALL_DIR} to your PATH (example):"
      echo "  export PATH=\"${USER_INSTALL_DIR}:\$PATH\""
      ;;
  esac
fi
echo ""
echo "Next steps:"
echo "  ${BINARY} auth login"