#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

if [ -z ${1+x} ]; then
    echo "ERROR: Please specify the version of neovim that you want to install"
    exit 1
fi

VERSION="$( echo ${1} | sed 's/v//g' )"

echo "Installing neovim version ${VERSION}"

INSTALLATION_DIR="${HOME}/.local/opt/nvim"
SYMLINK="${HOME}/.local/bin/nvim"
DOWNLOAD_DIR="${HOME}/Downloads/nvim-${VERSION}"

if [[ -d "${INSTALLATION_DIR}" ]]; then
    echo "Moving ${INSTALLATION_DIR} to ${INSTALLATION_DIR}.previous"
    mv "${INSTALLATION_DIR}" "${INSTALLATION_DIR}.previous"
fi

echo "Creating ${INSTALLATION_DIR}"
mkdir "${INSTALLATION_DIR}"

echo "Downloading neovim to ${DOWNLOAD_DIR}"
mkdir "${DOWNLOAD_DIR}"
curl -s \
  -L "https://github.com/neovim/neovim/releases/download/v${VERSION}/nvim-linux64.tar.gz" \
  -o "${DOWNLOAD_DIR}/nvim-linux64.tar.gz"

curl -s \
  -L "https://github.com/neovim/neovim/releases/download/v${VERSION}/nvim-linux64.tar.gz.sha256sum" \
  -o "${DOWNLOAD_DIR}/nvim-linux64.tar.gz.sha256sum"

echo "Verifying the package"
cd "${DOWNLOAD_DIR}"
sha256sum --check nvim-linux64.tar.gz.sha256sum

# extract contents to the installation directory
echo "Extracting the package to ${INSTALLATION_DIR}"
tar xzf "${DOWNLOAD_DIR}/nvim-linux64.tar.gz" --strip-components=1 -C "${INSTALLATION_DIR}"

# create the symlink
echo "Creating the symbolic link ${SYMLINK}"
ln -sf "${INSTALLATION_DIR}/bin/nvim" "${SYMLINK}"