#!/usr/bin/env bash

###  ------------------------------- ###
###  Helper methods for BASH scripts ###
###  ------------------------------- ###

realpath () {
(
  TARGET_FILE="$1"
  FIX_CYGPATH="$2"

  cd "$(dirname "$TARGET_FILE")"
  TARGET_FILE=$(basename "$TARGET_FILE")

  COUNT=0
  while [ -L "$TARGET_FILE" -a $COUNT -lt 100 ]
  do
      TARGET_FILE=$(readlink "$TARGET_FILE")
      cd "$(dirname "$TARGET_FILE")"
      TARGET_FILE=$(basename "$TARGET_FILE")
      COUNT=$(($COUNT + 1))
  done

  # make sure we grab the actual windows path, instead of cygwin's path.
  if [[ "x$FIX_CYGPATH" != "x" ]]; then
    echo "$(cygwinpath "$(pwd -P)/$TARGET_FILE")"
  else
    echo "$(pwd -P)/$TARGET_FILE"
  fi
)
}


# Uses uname to detect if we're in the odd cygwin environment.
is_cygwin() {
  local os=$(uname -s)
  case "$os" in
    CYGWIN*) return 0 ;;
    *)  return 1 ;;
  esac
}

# TODO - Use nicer bash-isms here.
CYGWIN_FLAG=$(if is_cygwin; then echo true; else echo false; fi)


# This can fix cygwin style /cygdrive paths so we get the
# windows style paths.
cygwinpath() {
  local file="$1"
  if [[ "$CYGWIN_FLAG" == "true" ]]; then
    echo $(cygpath -w $file)
  else
    echo $file
  fi
}

# Make something URI friendly
make_url() {
  url="$1"
  local nospaces=${url// /%20}
  if is_cygwin; then
    echo "/${nospaces//\\//}"
  else
    echo "$nospaces"
  fi
}

declare -a residual_args
declare -a java_args
declare -a scalac_args
declare -a sbt_commands
declare java_cmd=java
declare java_version
declare -r real_script_path="$(realpath "$0")"
declare -r sbt_home="$(realpath "$(dirname "$(dirname "$real_script_path")")")"
declare -r sbt_bin_dir="$(dirname "$real_script_path")"
declare -r app_version="1.3.10"

declare -r script_name=activator
declare -r java_opts=( "${ACTIVATOR_OPTS[@]}" "${SBT_OPTS[@]}" "${JAVA_OPTS[@]}" "${java_opts[@]}" )
userhome="$HOME"
if is_cygwin; then
  # cygwin sets home to something f-d up, set to real windows homedir
  userhome="$USERPROFILE"
fi
declare -r activator_user_home_dir="${userhome}/.activator"
declare -r java_opts_config_home="${activator_user_home_dir}/activatorconfig.txt"
declare -r java_opts_config_version="${activator_user_home_dir}/${app_version}/activatorconfig.txt"

echoerr () {
  echo 1>&2 "$@"
}
vlog () {
  [[ $verbose || $debug ]] && echoerr "$@"
}
dlog () {
  [[ $debug ]] && echoerr "$@"
}

jar_file () {
  echo "$(cygwinpath "${sbt_home}/libexec/activator-launch-${app_version}.jar")"
}

acquire_sbt_jar () {
  sbt_jar="$(jar_file)"

  if [[ ! -f "$sbt_jar" ]]; then
    echoerr "Could not find launcher jar: $sbt_jar"
    exit 2
  fi
}

execRunner () {
  # print the arguments one to a line, quoting any containing spaces
  [[ $verbose || $debug ]] && echo "# Executing command line:" && {
    for arg; do
      if printf "%s\n" "$arg" | grep -q ' '; then
        printf "\"%s\"\n" "$arg"
      else
        printf "%s\n" "$arg"
      fi
    done
    echo ""
  }

  # THis used to be exec, but we loose the ability to re-hook stty then
  # for cygwin...  Maybe we should flag the feature here...
  "$@"
}

addJava () {
  dlog "[addJava] arg = '$1'"
  java_args=( "${java_args[@]}" "$1" )
}
addSbt () {
  dlog "[addSbt] arg = '$1'"
  sbt_commands=( "${sbt_commands[@]}" "$1" )
}
addResidual () {
  dlog "[residual] arg = '$1'"
  residual_args=( "${residual_args[@]}" "$1" )
}
addDebugger () {
  addJava "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=$1"
}

get_mem_opts () {
  # if we detect any of these settings in ${JAVA_OPTS} we need to NOT output our settings.
  # The reason is the Xms/Xmx, if they don't line up, cause errors.
  if [[ "${JAVA_OPTS}" == *-Xmx* ]] || [[ "${JAVA_OPTS}" == *-Xms* ]] || [[ "${JAVA_OPTS}" == *-XX:MaxPermSize* ]] || [[ "${JAVA_OPTS}" == *-XX:MaxMetaspaceSize* ]] || [[ "${JAVA_OPTS}" == *-XX:ReservedCodeCacheSize* ]]; then
     echo ""
  else
    # a ham-fisted attempt to move some memory settings in concert
    # so they need not be messed around with individually.
    local mem=${1:-1024}
    local codecache=$(( $mem / 8 ))
    (( $codecache > 128 )) || codecache=128
    (( $codecache < 512 )) || codecache=512
    local class_metadata_size=$(( $codecache * 2 ))
    local class_metadata_opt=$([[ "$java_version" < "1.8" ]] && echo "MaxPermSize" || echo "MaxMetaspaceSize")

    echo "-Xms${mem}m -Xmx${mem}m -XX:ReservedCodeCacheSize=${codecache}m -XX:${class_metadata_opt}=${class_metadata_size}m"
  fi
}

require_arg () {
  local type="$1"
  local opt="$2"
  local arg="$3"
  if [[ -z "$arg" ]] || [[ "${arg:0:1}" == "-" ]]; then
    echo "$opt requires <$type> argument"
    exit 1
  fi
}

is_function_defined() {
  declare -f "$1" > /dev/null
}

# If we're *not* running in a terminal, and we don't have any arguments, then we need to add the 'ui' parameter
detect_terminal_for_ui() {
  [[ ! -t 0 ]] && [[ "${#residual_args}" == "0" ]] && {
    addResidual "ui"
  }
  # SPECIAL TEST FOR MAC
  [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]] && [[ "${#residual_args}" == "0" ]] && {
    echo "Detected MAC OSX launched script...."
    echo "Swapping to UI"
    addResidual "ui"
  }
}

process_args () {
  while [[ $# -gt 0 ]]; do
    case "$1" in
       -h|-help) usage; exit 1 ;;
    -v|-verbose) verbose=1 && shift ;;
      -d|-debug) debug=1 && shift ;;

           -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
           -mem) require_arg integer "$1" "$2" && sbt_mem="$2" && shift 2 ;;
     -jvm-debug) require_arg port "$1" "$2" && addDebugger $2 && shift 2 ;;
         -batch) exec </dev/null && shift ;;

       -sbt-jar) require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
   -sbt-version) require_arg version "$1" "$2" && sbt_version="$2" && shift 2 ;;
     -java-home) require_arg path "$1" "$2" && java_cmd="$2/bin/java" && shift 2 ;;

            -D*) addJava "$1" && shift ;;
            -J*) addJava "${1:2}" && shift ;;
              *) addResidual "$1" && shift ;;
    esac
  done

  is_function_defined process_my_args && {
    myargs=("${residual_args[@]}")
    residual_args=()
    process_my_args "${myargs[@]}"
  }

  java_version=$("$java_cmd" -Xmx512M -version 2>&1 | awk -F '"' '/version/ {print $2}')
  vlog "[process_args] java_version = '$java_version'"
}

# Detect that we have java installed.
checkJava() {
  local required_version="$1"
  # Now check to see if it's a good enough version
  if [[ "$java_version" == "" ]]; then
    echo
    echo No java installations was detected.
    echo Please go to http://www.java.com/getjava/ and download
    echo
    exit 1
  elif [[ ! "$java_version" > "$required_version" ]]; then
    echo
    echo The java installation you have is not up to date
    echo $script_name requires at least version $required_version+, you have
    echo version $java_version
    echo
    echo Please go to http://www.java.com/getjava/ and download
    echo a valid Java Runtime and install before running $script_name.
    echo
    exit 1
  fi
}


run() {
  # no jar? download it.
  [[ -f "$sbt_jar" ]] || acquire_sbt_jar "$sbt_version" || {
    # still no jar? uh-oh.
    echo "Download failed. Obtain the sbt-launch.jar manually and place it at $sbt_jar"
    exit 1
  }

  # process the combined args, then reset "$@" to the residuals
  process_args "$@"
  detect_terminal_for_ui
  set -- "${residual_args[@]}"
  argumentCount=$#

  # TODO - java check should be configurable...
  checkJava "1.6"

  #If we're in cygwin, we should use the windows config, and terminal hacks
  if [[ "$CYGWIN_FLAG" == "true" ]]; then
    stty -icanon min 1 -echo > /dev/null 2>&1
    addJava "-Djline.terminal=jline.UnixTerminal"
    addJava "-Dsbt.cygwin=true"
  fi

  # run sbt
  execRunner "$java_cmd" \
    "-Dactivator.home=$(make_url "$sbt_home")" \
    ${SBT_OPTS:-$default_sbt_opts} \
    $(get_mem_opts $sbt_mem) \
      ${JAVA_OPTS} \
    ${java_args[@]} \
    -jar "$sbt_jar" \
    "${sbt_commands[@]}" \
    "${residual_args[@]}"

  exit_code=$?

  # Clean up the terminal from cygwin hacks.
  if [[ "$CYGWIN_FLAG" == "true" ]]; then
    stty icanon echo > /dev/null 2>&1
  fi
  exit $exit_code
}


declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
declare -r sbt_opts_file=".sbtopts"
declare -r etc_sbt_opts_file="${sbt_home}/conf/sbtopts"
declare -r win_sbt_opts_file="${sbt_home}/conf/sbtconfig.txt"

usage() {
 cat <<EOM
Usage: $script_name [options]

  Command:
  ui                 Start the Activator UI
  new [name] [template-id]  Create a new project with [name] using template [template-id]
  list-templates     Print all available template names

  Options:
  -h | -help         print this message
  -v | -verbose      this runner is chattier
  -d | -debug        set sbt log level to debug
  -no-colors         disable ANSI color codes
  -sbt-create        start sbt even if current directory contains no sbt project
  -sbt-dir   <path>  path to global settings/plugins directory (default: ~/.sbt)
  -sbt-boot  <path>  path to shared boot directory (default: ~/.sbt/boot in 0.11 series)
  -ivy       <path>  path to local Ivy repository (default: ~/.ivy2)
  -mem    <integer>  set memory options (default: $sbt_mem, which is $(get_mem_opts $sbt_mem))
  -no-share          use all local caches; no sharing
  -no-global         uses global caches, but does not use global ~/.sbt directory.
  -jvm-debug <port>  Turn on JVM debugging, open at the given port.
  -batch             Disable interactive mode

  # sbt version (default: from project/build.properties if present, else latest release)
  -sbt-version  <version>   use the specified version of sbt
  -sbt-jar      <path>      use the specified jar as the sbt launcher
  -sbt-rc                   use an RC version of sbt
  -sbt-snapshot             use a snapshot version of sbt

  # java version (default: java from PATH, currently $(java -version 2>&1 | grep version))
  -java-home <path>         alternate JAVA_HOME

  # jvm options and output control
  JAVA_OPTS          environment variable, if unset uses "$java_opts"
  SBT_OPTS           environment variable, if unset uses "$default_sbt_opts"
  ACTIVATOR_OPTS     Environment variable, if unset uses ""
  .sbtopts           if this file exists in the current directory, it is
                     prepended to the runner args
  /etc/sbt/sbtopts   if this file exists, it is prepended to the runner args
  -Dkey=val          pass -Dkey=val directly to the java runtime
  -J-X               pass option -X directly to the java runtime
                     (-J is stripped)
  -S-X               add -X to sbt's scalacOptions (-S is stripped)

In the case of duplicated or conflicting options, the order above
shows precedence: JAVA_OPTS lowest, command line options highest.
EOM
}



process_my_args () {
  while [[ $# -gt 0 ]]; do
    case "$1" in
     -no-colors) addJava "-Dsbt.log.noformat=true" && shift ;;
      -no-share) addJava "$noshare_opts" && shift ;;
     -no-global) addJava "-Dsbt.global.base=$(pwd)/project/.sbtboot" && shift ;;
      -sbt-boot) require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
       -sbt-dir) require_arg path "$1" "$2" && addJava "-Dsbt.global.base=$2" && shift 2 ;;
     -debug-inc) addJava "-Dxsbt.inc.debug=true" && shift ;;
         -batch) exec </dev/null && shift ;;

    -sbt-create) sbt_create=true && shift ;;

              *) addResidual "$1" && shift ;;
    esac
  done

  # Now, ensure sbt version is used.
  [[ "${sbt_version}XXX" != "XXX" ]] && addJava "-Dsbt.version=$sbt_version"
}

loadConfigFile() {
  cat "$1" | sed '/^\#/d' | while read line; do
    eval echo $line
  done
}

# TODO - Pull in config based on operating system... (MSYS + cygwin should pull in txt file).
# Here we pull in the global settings configuration.
[[ -f "$etc_sbt_opts_file" ]] && set -- $(loadConfigFile "$etc_sbt_opts_file") "$@"
# -- Windows behavior stub'd
# JAVA_OPTS=$(cat "$WDIR/sbtconfig.txt" | sed -e 's/\r//g' -e 's/^#.*$//g' | sed ':a;N;$!ba;s/\n/ /g')


#  Pull in the project-level config file, if it exists.
[[ -f "$sbt_opts_file" ]] && set -- $(loadConfigFile "$sbt_opts_file") "$@"

# if configuration files exist, prepend their contents to the java args so it can be processed by this runner
# a "versioned" config trumps one on the top level
if [[ -f "$java_opts_config_version" ]]; then
  addConfigOpts $(loadConfigFile "$java_opts_config_version")
elif [[ -f "$java_opts_config_home" ]]; then
  addConfigOpts $(loadConfigFile "$java_opts_config_home")
fi

run "$@"