install

#!/usr/bin/env bash

# Description
# =================
# Install script run via curl command

# - Check if nFin is already installed
#   - if yes, use bin/install function
#   - if no, download to tmp folder, run bin/install

: ${NFIN_HOME:="~/.nfin"}
: ${NFIN_LIB:="$NFIN_HOME/lib"}
: ${NFIN_TMP:="$NFIN_HOME/tmp"}

check_is_installed() {
  if [ -d $NFIN_HOME ] && [ -f $NFIN_LIB/current/bin/install/install ]; then
    return 0
  fi

  return 1
}

cli_install() {
  source $NFIN_LIB/current/bin/internal/install
  install $@
  exit $?
}

get_version_json() {
  local url='https://api.github.com/repos/quinton22/nfin/releases'
  if command -v curl > /dev/null; then
    curl -fsSLk -H 'Content-Type: application/json' $url
  else
    wget -qO- --no-check-certificate $url # TODO: test
  fi
}

get_latest_version() {
  local version
  read -r version <<< $(get_version_json || echo '')
  version=$(echo $version | grep -Eo '"name": ".*?"')
  version=${version#*: \"}
  version=${version%\"}
  echo $version
}

download() {
  printf "downloading...\n"
  if command -v curl > /dev/null; then
    curl -fsSL "$1" > "$2"
  else
    wget -qO- "$1" > "$2"
  fi
}


install_latest() {
  if check_is_installed; then
    printf "Found installed version. For future uses, run 'nfin install $@'"
    cli_install $@
  fi

  # create folders
  if [ ! -d $NFIN_LIB ]; then
    mkdir -p $NFIN_LIB
  fi
  if [ ! -d $NFIN_TMP ]; then
    mkdir $NFIN_TMP
  fi

  # get latest version
  local version=$(get_latest_version)

  if [ -z "$version" ]; then
    printf "Could not get download from github\n"
    return 1
  fi

  local file_type download_url
  if command -v unzip > /dev/null; then
    file_type='zip'
    download_url="https://api.github.com/repos/quinton22/nfin/zipball/$version"
  elif command -v tar > /dev/null; then
    file_type='tar.gz'
    download_url="https://api.github.com/repos/quinton22/nfin/tarball/$version"
  else
    printf "Could not unzip. Please install either 'unzip' or 'tar'.\n"
    exit 1
  fi

  # download
  # =================================

  mkdir -p "$NFIN_TMP" 2> /dev/null

  local download_location="$NFIN_TMP/nfin_$version.$file_type"

  download "$download_url" "$download_location"

  if [ ! -f "$download_location" ]; then
    printf "Failed to download. Please try again.\n"
    exit 1
  fi

  if [ $file_type = zip ]; then
    unzip -qo "$download_location" -d "$NFIN_TMP/$version"
  else
    tar -f "$download_location" "$NFIN_TMP/$version"
  fi

  cp -r $NFIN_TMP/$version/*/ $NFIN_LIB/$version
  rm -rf $NFIN_TMP/*

  # ~/.nfin/lib/current --> ~/.nfin/lib/<version>
  ln -sF $NFIN_LIB/$version $NFIN_LIB/current


  # finish up install
  cli_install $@
}

install_latest $@