#!/bin/bash
# Copyright 2021 Benjamin Barenblat
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

set -eu -o pipefail

res=()
for f in "$@"; do
	f="${f//./_}"
	res+=("${f//\//_}")
done

cat <<EOF
// This file was generated by gen/resources_header. Edit that script instead.
#ifndef GLPLANET_RES_RES_H_
#define GLPLANET_RES_RES_H_

#include <stdint.h>

#include "third_party/abseil/absl/strings/string_view.h"
#include "third_party/abseil/absl/types/span.h"

extern "C" {

EOF

for symbol in "${res[@]}"; do
	echo "extern const char _binary_${symbol}_start;"
	echo "extern const char _binary_${symbol}_end;"
	echo
done

cat <<EOF
}  // extern "C"

namespace glplanet_resources {

EOF

for symbol in "${res[@]}"; do
	IFS=_ read -r -a parts <<<"$symbol"
	unset parts[0]
	function_name=
	for part in "${parts[@]}"; do
		function_name+="${part^}"
	done

	case $symbol in
	*_webp)
		echo "inline absl::Span<const uint8_t> $function_name() {"
		echo '  return absl::MakeConstSpan('
		echo "      reinterpret_cast<const uint8_t*>(&_binary_${symbol}_start),"
		echo "      reinterpret_cast<const uint8_t*>(&_binary_${symbol}_end));"
		echo '}'
		;;
	*)
		echo "inline absl::string_view $function_name() {"
		echo "  return absl::string_view(&_binary_${symbol}_start,"
		echo "                           &_binary_${symbol}_end);"
		echo '}'
		;;
	esac
	echo
done

cat <<EOF
}  // namespace glplanet_resources

#endif  // GLPLANET_RES_RES_H_
EOF