#!/usr/bin/env bash

# echo "65536 * 3 + 256 * 2 + 25" | bc
if [[ -n "${BASH_VERSION:-}" ]] &&
  (( 65536 * ${BASH_VERSINFO[0]} + 256 * ${BASH_VERSINFO[1]} + ${BASH_VERSINFO[2]} < 197145 ))
then
  echo "BASH 3.2.25 required (you have $BASH_VERSION)"
  exit 1
fi

export HOME PS4
export rvm_trace_flag rvm_debug_flag rvm_user_install_flag rvm_ignore_rvmrc rvm_prefix rvm_path

shopt -s extglob
PS4="+ \${BASH_SOURCE##\${rvm_path:-}} : \${FUNCNAME[0]:+\${FUNCNAME[0]}()}  \${LINENO} > "
set -o errtrace
set -o errexit

log()  { printf "%b\n" "$*" ; return $? ;  }

fail() { log "\nERROR: $*\n" ; exit 1 ; }

if [[ -z "${rvm_tar_command:-}" ]] && builtin command -v gtar >/dev/null
then
  rvm_tar_command=gtar
else
  rvm_tar_command=tar
fi
if [[ ! " ${rvm_tar_options:-} " =~ " --no-same-owner "  ]] && \
  $rvm_tar_command --help | GREP_OPTIONS="" \grep -- --no-same-owner >/dev/null
then
  rvm_tar_options="${rvm_tar_options:-} --no-same-owner"
  rvm_tar_options="${rvm_tar_options## }"
fi

usage()
{
  printf "%b" "

Usage

  rvm-installer [options] [action]

Options

  [[--]version] <latest|latest-x|latest-x.y|x.y.z> - Install RVM version
  [--]branch    <name> - Install RVM head, from named branch
  --trace              - used to debug the installer script

Actions

  master - Install RVM master branch from wayneeseguin rvm repo (Default).
  stable - Install RVM stable branch from wayneeseguin rvm repo.
  help   - Display CLI help (this output)

Branches:

  branch <branch>
  branch /<branch>
  branch <repo>/
  branch <repo>/<branch>

  Defaults:

    branch: master
    repo:   wayneeseguin

"
}

#Searches for highest available version for the given pattern
# fetch_version 1.10. -> 1.10.3
# fetch_version 1. -> 1.11.0
# fetch_version "" -> 2.0.1
fetch_version()
{
  curl -s https://api.github.com/repos/wayneeseguin/rvm/tags |
    sed -n '/"name": / {s/^.*".*": "\(.*\)".*$/\1/; p;}' |
    sort -t. -k 1,1n -k 2,2n -k 3,3n -k 4,4n -k 5,5n |
    GREP_OPTIONS="" \grep "^${1:-}" | tail -n 1
}

install_release()
{
  typeset _version
  _version=$1
  log "Downloading RVM version ${_version}"
  get_and_unpack \
    https://github.com/wayneeseguin/rvm/tarball/${_version} \
    rvm-${_version}.tar.gz \
    wayneeseguin-rvm-
}

install_head()
{
  typeset _repo _branch
  case "$1" in
    (/*)
      _repo=wayneeseguin
      _branch=${1#/}
      ;;
    (*/)
      _repo=${1%/}
      _branch=master
      ;;
    (*/*)
      _repo=${1%/*}
      _branch=${1#*/}
      ;;
    (*)
      _repo=wayneeseguin
      _branch=$1
      ;;
  esac
  log "Downloading RVM from ${_repo} branch ${_branch}"
  get_and_unpack \
    https://github.com/${_repo}/rvm/tarball/${_branch} \
    ${_repo}-rvm-${_branch}.tgz \
    ${_repo}-rvm-
}

get_and_unpack()
{
  typeset _url _file _patern
  _url=$1
  _file=$2
  _patern=$3

  if curl -L ${_url} -o ${rvm_archives_path}/${_file}
  then
    true
  else
    typeset ret=$?
    case $ret in
      (60)
        log "
Could not download '${_url}'.
  Make sure your certificates are up to date as described above.
  To continue in insecure mode run 'echo insecure >> ~/.curlrc'.
"
        return 60
        ;;
      (*)
        log "
Could not download '${_url}'.
  curl returned status '$ret'.
"
        return 1
        ;;
    esac
  fi

  [[ -d "${rvm_src_path}/rvm" ]] || \mkdir -p "${rvm_src_path}/rvm"
  if ! builtin cd "${rvm_src_path}/rvm"
  then
    log "Could not change directory '${rvm_src_path}/rvm'."
    return 2
  fi

  rm -rf ${rvm_src_path}/rvm/*
  if ! $rvm_tar_command xzf ${rvm_archives_path}/${_file} ${rvm_tar_options:-}
  then
    log "Could not extract RVM sources."
    return 3
  fi

  if ! mv ${_patern}*/* .
  then
    log "Could not move RVM sources path."
    return 4
  fi
  rm -rf ${_patern}*
}

# Tracing, if asked for.
if [[ "$*" =~ --trace ]] || (( ${rvm_trace_flag:-0} > 0 ))
then
  set -o xtrace
  rvm_trace_flag=1
fi

# Variable initialization, remove trailing slashes if they exist on HOME
true \
  ${rvm_trace_flag:=0} ${rvm_debug_flag:=0} ${rvm_user_install_flag:=0}\
  ${rvm_ignore_rvmrc:=0} HOME="${HOME%%+(\/)}"


if (( rvm_ignore_rvmrc == 0 ))
then
  for rvmrc in /etc/rvmrc "$HOME/.rvmrc"
  do
    if [[ -s "$rvmrc" ]]
    then
      if GREP_OPTIONS="" \grep '^\s*rvm .*$' "$rvmrc" >/dev/null 2>&1
      then
        printf "%b" "
Error: $rvmrc is for rvm settings only.
rvm CLI may NOT be called from within $rvmrc.
Skipping the loading of $rvmrc
"
        return 1
      else
        source "$rvmrc"
      fi
    fi
  done
fi

if [[ -z "${rvm_path:-}" ]]
then
  if (( UID == 0 ))
  then
    rvm_user_install_flag=0
    rvm_prefix="/usr/local"
    rvm_path="${rvm_prefix}/rvm"
  else
    rvm_user_install_flag=1
    rvm_prefix="$HOME"
    rvm_path="${rvm_prefix}/.rvm"
  fi
fi
if [[ -z "${rvm_prefix}" ]]
then
  rvm_prefix=$( dirname $rvm_path )
fi

install_rubies=()
install_gems=()
# Parse CLI arguments.
while (( $# > 0 ))
do
  token="$1"
  shift
  case "$token" in

    --trace)
      set -o xtrace
      rvm_trace_flag=1
      ;;

    --path)
      if [[ -n "${1:-}" ]]
      then
        rvm_path="$1"
        shift
      else
        fail "--path must be followed by a path."
      fi
      ;;

    --branch|branch) # Install RVM from a given branch
      if [[ -n "${1:-}" ]]
      then
        version="head"
        branch="$1"
        shift
      else
        fail "--branch must be followed by a branchname."
      fi
      ;;

    --user-install|--auto)
      token=${token#--}
      token=${token//-/_}
      export "rvm_${token}_flag"=1
      printf "%b" "Turning on ${token/_/ } mode.\n"
      ;;

    --without-gems=*)
      export rvm_without_gems="${token#--without-gems=}"
      printf "%b" "Installing RVM without gems: ${rvm_without_gems}.\n"
      ;;

    --version|version)
      version="$1"
      shift
      ;;

    head)
      version="head"
      branch="master"
      ;;

    stable|master)
      version="head"
      branch="$token"
      ;;

    latest|latest-*|+([[:digit:]]).+([[:digit:]]).+([[:digit:]]))
      version="$token"
      ;;

    --ruby)
      install_rubies+=( ruby )
      ;;

    --ruby=*)
      token=${token#--ruby=}
      install_rubies+=( ${token//,/ } )
      ;;

    --rails)
      install_gems+=( rails )
      ;;

    --gems=*)
      token=${token#--gems=}
      install_gems+=( ${token//,/ } )
      ;;

    help|usage)
      usage
      exit 0
      ;;
  *)
    usage
    exit 1
    ;;

  esac
done

case "$rvm_path" in
  *[[:space:]]*)
    printf "%b" "
It looks you are one of the happy *space* users(in home dir name),
RVM is not yet fully ready for it, use this trick to fix it:

    sudo ln -s \"$HOME/.rvm/\" /$USER.rvm
    echo \"export rvm_path=/$USER.rvm\" >> \"$HOME/.rvmrc\"

and start installing again.

"
    exit 2
  ;;
  /usr/share/ruby-rvm)
    printf "%b" "
It looks you are one of the happy Ubuntu users,
RVM packaged by Ubuntu is old and broken,
follow this link for details how to fix:

  http://stackoverflow.com/a/9056395/497756

"
    [[ "${rvm_uses_broken_ubuntu_path:-no}" == "yes" ]] || exit 3
  ;;
esac

if (( ${#install_gems[@]} > 0 && ${#install_rubies[@]} == 0 ))
then
  install_rubies=( ruby )
fi

if (( ${#install_rubies[@]} > 0 ))
then
  echo "Please read and follow further instructions."
  echo "Press ENTER to continue."
  builtin read -n 1 -s -r anykey
fi

true "${version:=head}"

if [[ "$rvm_path" != /* ]]
then
  fail "The rvm install path must be fully qualified. Tried $rvm_path"
fi

rvm_src_path="$rvm_path/src"
rvm_archives_path="$rvm_path/archives"
rvm_releases_url="https://rvm.io/releases"

for dir in "$rvm_src_path" "$rvm_archives_path"
do
  if [[ ! -d "$dir" ]]
  then
    mkdir -p "$dir"
  fi
done

# Perform the actual installation, first we obtain the source using whichever
# means was specified, if any. Defaults to head.
case "${version}" in
  (head)
    echo "${branch}" > "$rvm_path/RELEASE"
    install_head ${branch:-master} || exit $?
    ;;

  (latest)
    echo "${version}" > "$rvm_path/RELEASE"
    install_release $(fetch_version "") || exit $?
    ;;

  (latest-*)
    echo "${version}" > "$rvm_path/RELEASE"
    install_release $(fetch_version "${version#latest-}") || exit $?
    ;;

  (+([[:digit:]]).+([[:digit:]]).+([[:digit:]])) # x.y.z
    echo "version" > "$rvm_path/RELEASE"
    install_release ${version} || exit $?
    ;;

  (*)
    fail "Something went wrong, unrecognized version '$version'"
    ;;
esac

# required flag - path to install
flags=( --path "$rvm_path" )

if (( rvm_trace_flag == 1 ))
then flags+=("--trace")
fi

if (( rvm_debug_flag == 1 ))
then flags+=("--debug")
fi

if (( rvm_auto_flag == 1 ))
then flags+=("--auto")
fi

if [[ -n "${rvm_without_gems:-}" ]]
then flags+=("--without-gems=${rvm_without_gems}")
fi

chmod +x ./scripts/install
./scripts/install "${flags[@]}"

(
  source ${rvm_scripts_path:-${rvm_path}/scripts}/rvm
  source ${rvm_scripts_path:-${rvm_path}/scripts}/version
  __rvm_version

  if (( ${#install_rubies[@]} > 0 ))
  then
    {
      echo "Ruby (and needed base gems) for your selection will be installed shortly."
      echo "Before it happens, please read and execute the instructions below."
      echo "Please use a separate terminal to execute any additional commands."
      echo "Press 'q' to continue."
    } | less
  fi

  for _ruby in ${install_rubies[@]}
  do
    command rvm install ${_ruby} -j 2
  done
  for _ruby in ${install_rubies[@]}
  do
    # set the first one as default, skip rest
    rvm alias create default ${_ruby}
    break
  done

  for _gem in ${install_gems[@]}
  do
    rvm all do gem install ${_gem}
  done

  if (( ${#install_rubies[@]} > 0 ))
  then
    printf "%b" "
  * To start using RVM you need to run \`source $rvm_path/scripts/rvm\`
    in all your open shell windows, in rare cases you need to reopen all shell windows.
"
  fi

  if [[ "${install_gems[*]}" =~ "rails" ]]
  then
    printf "%b" "
  * To start using rails you need to run \`rails new <project_dir>\`.
"
  fi
)