#!/bin/bash

set -e

version_lt() { test "$(printf '%s\n' "$@" | { [ "$(uname)" = "Linux" ] && (sort -V || sort -t. -k 1,1n -k 2,2n -k 3,3n -k 4,4n;) } | tail -n 1)" != "$1"; }

# run command at repo root
CURRENT_PATH=$PWD
if [ -d .git ]; then
  cd "$(git rev-parse --show-toplevel)"
fi

if ! type yarn > /dev/null; then
  cat << EOF
FATAL: Yarn could not be found.

Please follow the official installation instructions at
https://classic.yarnpkg.com/en/docs/install
and try again.
EOF
  exit 1
fi

if version_lt "$(yarn --version)" '1.22.0'; then
  cat << EOF
FATAL: Your Yarn version is not supported.

Please upgrade to version 1.22.0 or higher and try again.
See https://classic.yarnpkg.com/en/docs/install for instructions.
EOF
  exit 1
fi

if version_lt "$(node --version)" 'v12.0.0'; then
  cat << EOF
FATAL: Your Node.js version is not supported.

Please upgrade to version 12 or higher and try again.
We recommend running the latest LTS release, see https://nodejs.org/en/about/releases/ for details.
EOF
  exit 1
fi

echo "Copying config files..."
if [ ! -f config.json ]; then
  cp config.json.example config.json
fi

echo "Installing packages..."
yarn install --production=true --frozen-lockfile

cat << EOF
If you want to build the frontend yourself, you need to run 'yarn install --frozen-lockfile' before 'yarn build' to install the devDependencies for the build process.

Edit the following config file to setup HedgeDoc server and client.
Read more info at https://docs.hedgedoc.org/configuration/

* config.json           -- HedgeDoc config
EOF

# change directory back
cd "$CURRENT_PATH"