#!/usr/bin/env bash

# Ensure this file is executable via `chmod a+x fractl`, then place it
# somewhere on your $PATH, like ~/bin. The rest of Leiningen will be
# installed upon first run into the ~/.fractl/self-installs directory.

function msg {
    echo "$@" 1>&2
}

export FRACTL_VERSION="0.5.1"
# Must be sha256sum
export FRACTL_CHECKSUM='73559e4f39ffbb6a97ec09e2aa86f97b75b02411088957254f146c338f68f4a8'

if [[ "$OSTYPE" == "cygwin" ]] || [[ "$OSTYPE" == "msys" ]]; then
    delimiter=";"
else
    delimiter=":"
fi

if [[ "$OSTYPE" == "cygwin" ]]; then
  cygwin=true
else
  cygwin=false
fi

function command_not_found {
    msg "Fractl couldn't find $1 in your \$PATH ($PATH), which is required."
    exit 1
}

function make_native_path {
    # ensure we have native paths
    if $cygwin && [[ "$1"  == /* ]]; then
    echo -n "$(cygpath -wp "$1")"
    elif [[ "$OSTYPE" == "msys" && "$1"  == /?/* ]]; then
    echo -n "$(sh -c "(cd $1 2</dev/null && pwd -W) || echo $1 | sed 's/^\\/\([a-z]\)/\\1:/g'")"
    else
    echo -n "$1"
    fi
}

#  usage : add_path PATH_VAR [PATH]...
function add_path {
    local path_var="$1"
    shift
    while [ -n "$1" ];do
        # http://bashify.com/?Useful_Techniques:Indirect_Variables:Indirect_Assignment
        if [[ -z ${!path_var} ]]; then
          export ${path_var}="$(make_native_path "$1")"
        else
          export ${path_var}="${!path_var}${delimiter}$(make_native_path "$1")"
        fi
    shift
    done
}

function download_failed_message {
    cat <<-EOS 1>&2
	Failed to download $1 (exit code $2)
	It's possible your HTTP client's certificate store does not have the
	correct certificate authority needed. This is often caused by an
	out-of-date version of libssl. It's also possible that you're behind a
	firewall and haven't set HTTP_PROXY and HTTPS_PROXY.
	EOS
}

function checksum_failed_message {
    cat <<-EOS 1>&2
	Failed to properly download $1
	The checksum was mismatched. and we could not verify the downloaded
	file. We expected a sha256 of
	$2 and actually had
	$3.
	We used '$SHASUM_CMD' to verify the downloaded file.
	EOS
}

function self_install {
  if [ -r "$FRACTL_JAR" ]; then
    cat <<-EOS 1>&2
	The self-install jar already exists at $FRACTL_JAR.
	If you wish to re-download, delete it and rerun "$0 self-install".
	EOS
    exit 1
  fi
  msg "Downloading Fractl to $FRACTL_JAR now..."
  mkdir -p "$(dirname "$FRACTL_JAR")"
  FRACTL_URL="https://github.com/fractl-io/fractl/releases/download/$FRACTL_VERSION/fractl-$FRACTL_VERSION-standalone.jar"
  echo "$HTTP_CLIENT $FRACTL_JAR.pending $FRACTL_URL"
  $HTTP_CLIENT "$FRACTL_JAR.pending" "$FRACTL_URL"
  local exit_code=$?
  if [ $exit_code == 0 ]; then
      printf "$FRACTL_CHECKSUM  $FRACTL_JAR.pending\n" > "$FRACTL_JAR.pending.shasum"
      $SHASUM_CMD -c "$FRACTL_JAR.pending.shasum"
      if [ $? == 0 ]; then
        mv -f "$FRACTL_JAR.pending" "$FRACTL_JAR"
      else
        got_sum="$($SHASUM_CMD "$FRACTL_JAR.pending" | cut -f 1 -d ' ')"
        checksum_failed_message "$FRACTL_URL" "$FRACTL_CHECKSUM" "$got_sum"
        rm "$FRACTL_JAR.pending" 2> /dev/null
        exit 1
      fi
  else
      rm "$FRACTL_JAR.pending" 2> /dev/null
      download_failed_message "$FRACTL_URL" "$exit_code"
      exit 1
  fi
}

export FRACTL_HOME="${FRACTL_HOME:-"$HOME/.fractl"}"

if $cygwin; then
    export FRACTL_HOME=$(cygpath -w "$FRACTL_HOME")
fi

FRACTL_JAR="$FRACTL_HOME/self-installs/fractl-$FRACTL_VERSION-standalone.jar"

# normalize $0 on certain BSDs
if [ "$(dirname "$0")" = "." ]; then
    SCRIPT="$(which "$(basename "$0")")"
    if [ -z "$SCRIPT" ]; then
        SCRIPT="$0"
    fi
else
    SCRIPT="$0"
fi

# resolve symlinks to the script itself portably
while [ -h "$SCRIPT" ] ; do
    ls=$(ls -ld "$SCRIPT")
    link=$(expr "$ls" : '.*-> \(.*\)$')
    if expr "$link" : '/.*' > /dev/null; then
        SCRIPT="$link"
    else
        SCRIPT="$(dirname "$SCRIPT"$)/$link"
    fi
done

BIN_DIR="$(dirname "$SCRIPT")"

# This needs to be defined before we call HTTP_CLIENT below
if [ "$HTTP_CLIENT" = "" ]; then
    if type -p curl >/dev/null 2>&1; then
        if [ "$https_proxy" != "" ]; then
            CURL_PROXY="-x $https_proxy"
        fi
        HTTP_CLIENT="curl $CURL_PROXY -f -L -o"
    else
        HTTP_CLIENT="wget -O"
    fi
fi

# This needs to be defined before we call SHASUM_CMD below
if [ "$SHASUM_CMD" = "" ]; then
    if type -p sha256sum >/dev/null 2>&1; then
        export SHASUM_CMD="sha256sum"
    elif type -p shasum >/dev/null 2>&1; then
        export SHASUM_CMD="shasum --algorithm 256"
    else
        command_not_found sha256sum
    fi
fi

if [ ! -x "$JAVA_CMD" ] && ! type -f java >/dev/null
then
    msg "Fractl couldn't find 'java' executable, which is required."
    msg "Please either set JAVA_CMD or put java (>=1.6) in your \$PATH ($PATH)."
    exit 1
fi

export FRACTL_JAVA_CMD="${FRACTL_JAVA_CMD:-${JAVA_CMD:-java}}"

# Handle jline issue with cygwin not propagating OSTYPE through java subprocesses: https://github.com/jline/jline2/issues/62
cygterm=false
if $cygwin; then
  case "$TERM" in
    rxvt* | xterm* | vt*) cygterm=true ;;
  esac
fi

export FRACTL_JVM_OPTS="${FRACTL_JVM_OPTS-"-XX:+TieredCompilation -XX:TieredStopAtLevel=1"}"

if $cygterm; then
  FRACTL_JVM_OPTS="$FRACTL_JVM_OPTS -Djline.terminal=jline.UnixTerminal"
  stty -icanon min 1 -echo > /dev/null 2>&1
fi

if [ ! -r "$FRACTL_JAR" ]; then
    self_install
    present_dir=`pwd`
    rm -rf $FRACTL_HOME/self-installs/fractl-lein-template
    cd $FRACTL_HOME/self-installs
    git clone https://github.com/fractl-io/fractl-lein-template.git || exit 1
    cd $FRACTL_HOME/self-installs/fractl-lein-template/fractl-model
    lein install || exit 1
    cd ${present_dir}
fi

$FRACTL_JAVA_CMD $FRACTL_JVM_OPTS -jar ${FRACTL_JAR} "$@"