#!/usr/bin/env bash

# TODO(pascallouis): better automate this.

set -euxo pipefail

if [[ ! -d "${FUCHSIA_DIR}" ]]; then
  echo "FUCHSIA_DIR environment variable not a directory"
  exit 1
fi

pushd $FUCHSIA_DIR

./scripts/fx build garnet/go/src/fidl

tmpout=$(mktemp -d 2>/dev/null || mktemp -d -t 'tmpout')
ir_file="${tmpout}/out.json"

trap 'rm -rf -- "${tmpout}" && popd > /dev/null' EXIT

# Parameters:
# $1 = directory where fidl file is found.
# $2 =  output of subdirectory of syscall/zx
# $3..n = additional fidl dependencies needed to generate this target.
function generate_file {
  local source_dir=$1
  shift
  local package_dir=$1
  shift
  local additional_files=""
  while (( "$#" )); do
    additional_files+="--files $1"
    shift
  done
  out_file=third_party/go/src/syscall/zx/"${package_dir}"/impl.go
  copyright_line=$(grep -E "^// Copyright [0-9]+" "${out_file}" || \
    echo "// Copyright $(date +%Y) The Fuchsia Authors. All rights reserved.")
  ./out/x64/host_x64/fidlc \
    --json "${ir_file}" \
    ${additional_files} \
    --files "${source_dir}"/*.fidl
  ./out/x64/host_x64/fidlgen \
    --json "${ir_file}" \
    --generators go \
    --include-base notused \
    --output-base "${tmpout}"

  tmpfile=$(mktemp ${tmpout}/tmp.XXXXXXXX)
  echo "${copyright_line}" > "${tmpfile}"
  cat << EOF >> "${tmpfile}"
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// GENERATED FILE: Do not edit!
//
// To rebuild this file, invoke third_party/go/regen-fidl.

// +build fuchsia
EOF
  cat "${tmpout}"/impl.go >> "${tmpfile}"
  perl -pi -e 's|^// WARNING: This file is machine generated by fidlgen.\n$||' "${tmpfile}"
  perl -pi -e 's|fidl/fuchsia/mem|syscall/zx/mem|' "${tmpfile}"
  ./out/x64/tools/goroot/bin/gofmt -s -w "${tmpfile}"
  mv -- "${tmpfile}" "${out_file}"
}

generate_file third_party/go/src/syscall/zx/fidl/bindingstest/ fidl/bindingstest
generate_file zircon/system/fidl/fuchsia-net net
generate_file zircon/system/fidl/fuchsia-mem mem
generate_file zircon/system/fidl/fuchsia-io io \
  zircon/system/fidl/fuchsia-mem/*.fidl