#!/bin/bash

set -eo pipefail

OS_TARGETS=(linux)
ARCH_TARGETS=${ARCH_TARGETS:-amd64 mipsle}

export GOMIPS=softfloat

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"

function build {

  local name=$1
  local srcdir=$2
  local os=$3
  local arch=$4

  local dirname="$name-$os-$arch"
  local destdir="$DIR/../release/$dirname"

  rm -rf "$destdir"
  mkdir -p "$destdir"

  echo "building $dirname..."

  CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" go build \
    -ldflags="-s -w" \
    -gcflags=-trimpath="${PWD}" \
    -asmflags=-trimpath="${PWD}" \
    -o "$destdir/$name" \
    "$srcdir"

  # Disable UPX compression for MIPS archs
  # See https://github.com/upx/upx/issues/339
  if [ ! -z "$(which upx)" ] && [[ ! "$arch" =~ "mips" ]]; then
    upx --best "$destdir/$name"
  fi

  if [ ! -z "${GPG_SIGNING_KEY}" ]; then
    echo "signing '$destdir/$name' with gpg key '$GPG_SIGNING_KEY'..."
    gpg --sign --default-key "${GPG_SIGNING_KEY}" --output "$destdir/$name.sig" "$destdir/$name"
  fi
}

function copy {

  local name=$1
  local os=$2
  local arch=$3
  local src=$4
  local dest=$5

  local dirname="$name-$os-$arch"
  local destdir="$DIR/../release/$dirname"

  echo "copying '$src' to '$destdir/$dest'..."

  mkdir -p "$(dirname $destdir/$dest)"

  cp -rfL $src "$destdir/$dest"

}

function dump_default_conf {
  # Generate and copy configuration file
  local command=$1
  local os=$2
  local arch=$3
  local tmp_conf=$(mktemp)

  go run "$DIR/../cmd/$command" -dump-config > "$tmp_conf"
  copy "$command" $os $arch "$tmp_conf" "$command.conf"
  rm -f "$tmp_conf"
}

function compress {

  local name=$1
  local os=$2
  local arch=$3

  local dirname="$name-$os-$arch"
  local destdir="$DIR/../release/$dirname"

  echo "compressing $dirname..."
  tar -czf "$destdir.tar.gz" -C "$destdir/../" "$dirname"
}

function release_keygen {
  local os=$1
  local arch=$2
  build 'keygen' "$DIR/../cmd/keygen" $os $arch
  copy 'keygen' $os $arch "$DIR/../README.md" "README.md"
  compress 'keygen' $os $arch
}


function main {
  for os in ${OS_TARGETS[@]}; do
    for arch in ${ARCH_TARGETS[@]}; do
      release_keygen $os $arch
    done
  done
}

main