include/tool/load_protobuf.hpp

#pragma once

#include <fcntl.h>
#include <unistd.h>
#include <iostream>
#include <fstream>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/text_format.h>
#include "google/protobuf/util/json_util.h"

#include "tool/error_code.hpp"

using google::protobuf::io::FileInputStream;
using google::protobuf::io::FileOutputStream;
using google::protobuf::io::ZeroCopyInputStream;
using google::protobuf::io::CodedInputStream;
using google::protobuf::io::ZeroCopyOutputStream;
using google::protobuf::io::CodedOutputStream;
using google::protobuf::Message;


static std::string getFileExtension(const std::string& file_path) {
    size_t dot_pos = file_path.find_last_of('.');
    if (dot_pos != std::string::npos && dot_pos < file_path.length() - 1) {
        return file_path.substr(dot_pos + 1);
    }
    return "";
}

static bool readTxtProtobufFile(const std::string &file_path, ::google::protobuf::Message& message)
{
    int fd = open(file_path.c_str(), O_RDONLY);
    if (fd == -1) return false;
    auto* input = new FileInputStream(fd);
    bool success = google::protobuf::TextFormat::Parse(input, &message);
    delete input;
    close(fd);
    return success;
}

static bool readJsonProtobufFile(const std::string& file_path, ::google::protobuf::Message& message) {
    std::ifstream file(file_path);
    std::string json_data;

    if (file.is_open()) {
        // 将文件内容读取到字符串
        std::string line;
        while (std::getline(file, line)) {
            json_data += line;
        }
        file.close();
    } else {
        return false;
    }

    return google::protobuf::util::JsonStringToMessage(json_data, &message) == absl::OkStatus();
}

static Error_manager loadProtobufFile(const std::string &file, ::google::protobuf::Message &message) {
    std::string ext = getFileExtension(file);
    if (ext.empty()) {
        return {PARSE_FAILED, MINOR_ERROR, "prase protobuf file %s ext failed.", file.c_str()};
    }

    bool ret = false;
    if (ext == "prototxt") {
        ret = readTxtProtobufFile(file, message);
    } else if (ext == "json") {
        ret = readJsonProtobufFile(file, message);
    } else {
        return {PARSE_FAILED, MINOR_ERROR, "protobuf file %s type error.", file.c_str()};
    }

    if (ret) {
        return {SUCCESS, NORMAL, "prase protobuf file %s success.", file.c_str()};
    } else {
        return {PARSE_FAILED, MINOR_ERROR, "prase protobuf file %s failed.", file.c_str()};
    }
}