#!/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 arguments needed to generate this target.
function generate_file {
  local source_dir=$1
  shift
  local package_dir=$1
  shift
  out_file=third_party/go/src/syscall/zx/"${package_dir}"/impl.go
  copyright_line=$(grep -E "^// Copyright [0-9]+" "${out_file}" || \
    echo "// Copyright $(date +%Y) The Fuchsia Authors. All rights reserved.")
  ./out/default.zircon/tools/fidlc \
    --json "${ir_file}" \
    $@ \
    --files "${source_dir}"/*.fidl
  fx 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|^// Code generated by fidlgen; DO NOT EDIT.\n$||' "${tmpfile}"
  perl -pi -e 's|fidl/fuchsia/|syscall/zx/|' "${tmpfile}"
  perl -pi -e 's|package socket|package net|' "${tmpfile}"
  ./prebuilt/third_party/go/linux-x64/bin/gofmt -s -w "${tmpfile}"
  mv -- "${tmpfile}" "${out_file}"
}

generate_file third_party/go/src/syscall/zx/fidl/bindingstest/ fidl/bindingstest
generate_file tools/fidl/gidl-conformance-suite/ fidl/conformance
generate_file zircon/system/fidl/fuchsia-mem mem
generate_file zircon/system/fidl/fuchsia-io io \
  --files zircon/system/fidl/fuchsia-mem/*.fidl
generate_file zircon/system/fidl/fuchsia-posix-socket net \
  --files zircon/system/fidl/fuchsia-mem/*.fidl \
  --files zircon/system/fidl/fuchsia-io/*.fidl