#!/usr/bin/env bash

set -euo pipefail

# shellcheck source=../lib/utils.sh
source "$(dirname $0)/../lib/utils.sh"

install_ruby() {
  ensure_ruby_build_setup

  local install_type=$1
  local version=$2
  local install_path=$3

  if [ "$install_type" != "version" ]; then
    echoerr "Cannot install specific ref from source, sorry."
    echoerr "For a list of available versions, see \`asdf list-all ruby\`"
    exit 1
  fi

  local opts=""
  local patches=""

  if [[ -n "${RUBY_APPLY_PATCHES:-}" ]]; then
    opts="$opts --patch"
    patches=$(fetch_patches "$RUBY_APPLY_PATCHES")
  fi

  if [[ -n "${RUBY_BUILD_OPTS:-}" ]]; then
    opts="$opts $RUBY_BUILD_OPTS"
  fi

  # shellcheck disable=SC2086
  echo "$patches" | $(ruby_build_path) ${opts} "$version" "$install_path"
}

fetch_patches() {
  while read -r line; do
    if [ "$line" = "" ]; then continue; fi
    if [[ "$line" =~ ^[Hh][Tt][Tt][Pp][Ss]?:// ]]; then
      >&2 echo "Using patch from URL: $line"
      curl -fSs "$line" || exit 1
    else
      local abs_path
      abs_path="$(get_absolute_path "$line")"
      >&2 echo "Using local patch: $abs_path"
      cat "$abs_path" || exit 1
    fi
  done <<< "$@"
}

get_absolute_path() {
  local start_dir
  local rel_path
  local rel_dir
  local rel_base

  start_dir=$(pwd)
  rel_path=$1
  rel_dir=$(dirname "$rel_path")
  rel_base=$(basename "$rel_path")

  (
    cd "$start_dir" \
      && cd "$rel_dir" 2>/dev/null \
      && echo "$(pwd)/$rel_base" \
      || echo "$rel_path"
  )
}

install_default_gems() {
  local args=()
  local default_gems="${HOME}/.default-gems"
  local gem="${ASDF_INSTALL_PATH}/bin/gem"

  if [ ! -f "$default_gems" ]; then
    return;
  fi

  echo ""

  # Parsing of .default-gems was originally lifted from rbenv-default-gems
  # which is Copyright (c) 2013 Sam Stephenson
  # https://github.com/rbenv/rbenv-default-gems/blob/ead6788/LICENSE
  while IFS=" " read -r -a line; do

    # Skip empty lines.
    [ "${#line[@]}" -gt 0 ] || continue

    # Skip comment lines that begin with `#`.
    [ "${line[0]:0:1}" != "#" ] || continue

    gem_name="${line[0]}"
    gem_version="${line[1]-}"

    if [ "$gem_version" == "--pre" ]; then
      args=( --pre )
    elif [ -n "$gem_version" ]; then
      args=( --version "$gem_version" )
    else
      args=()
    fi

    echo -n "Running: gem install $gem_name ${args[@]:-} ... "

    if output=$($gem install "$gem_name" "${args[@]+"${args[@]}"}" 2>&1); then
      echo -e "SUCCESS"
    else
      echo -e "FAIL: $output"
    fi
  done < "$default_gems"
}

install_ruby "$ASDF_INSTALL_TYPE" "$ASDF_INSTALL_VERSION" "$ASDF_INSTALL_PATH"
install_default_gems