// SPDX-License-Identifier: Apache-2.0

// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

// BUILTIN-PLUGIN: Temporarily move the wasi-logging plugin sources here until

// the new plugin architecture is ready in 0.15.0.

#include "plugin/wasi_logging/func.h"

#include <string_view>

namespace WasmEdge {

namespace Host {

namespace WASILogging {

using namespace std::literals;

Expect<void> Log::body(const Runtime::CallingFrame &Frame, uint32_t Level,

                       uint32_t CxtPtr, uint32_t CxtLen, uint32_t MsgPtr,

                       uint32_t MsgLen) {

  // Check memory instance from module.

  auto *MemInst = Frame.getMemoryByIndex(0);

  if (MemInst == nullptr) {

    return Unexpect(ErrCode::Value::HostFuncError);

  }

  // Get Context and Message string_view with full-extent bounds check.

  auto CxtSV = MemInst->getStringView(CxtPtr, CxtLen);

  auto MsgSV = MemInst->getStringView(MsgPtr, MsgLen);

  if (CxtSV.data() == nullptr || MsgSV.data() == nullptr) {

    return Unexpect(ErrCode::Value::HostFuncError);

  }

  // Setup Logger for Stdout or Stderr

  std::shared_ptr<spdlog::logger> Logger;

  if (CxtSV == "stdout"sv || CxtSV == ""sv) {

    Logger = Env.StdoutLogger;

  } else if (CxtSV == "stderr"sv) {

    Logger = Env.StderrLogger;

  } else {

    if (CxtSV != Env.getLogFileName()) {

      try {

        spdlog::drop(Env.getLogRegName());

        Env.FileLogger =

            spdlog::basic_logger_mt(Env.getLogRegName(), std::string(CxtSV));

        Env.FileLogger->set_level(spdlog::level::trace);

        Env.FileLogger->set_pattern(Env.DefFormat);

        Env.setLogFileName(CxtSV);

      } catch (const spdlog::spdlog_ex &Ex) {

        spdlog::error("[WasiLogging] Cannot log into file: {}"sv, Ex.what());

        return Unexpect(ErrCode::Value::HostFuncError);

      }

    }

    Logger = Env.FileLogger;

  }

  // Print Message by Logging Level

  switch (static_cast<LogLevel>(Level)) {

  case LogLevel::Trace:

    Logger->trace(MsgSV);

    break;

  case LogLevel::Debug:

    Logger->debug(MsgSV);

    break;

  case LogLevel::Info:

    Logger->info(MsgSV);

    break;

  case LogLevel::Warn:

    Logger->warn(MsgSV);

    break;

  case LogLevel::Error:

    Logger->error(MsgSV);

    break;

  case LogLevel::Critical:

    Logger->critical(MsgSV);

    break;

  default:

    spdlog::error("[WasiLogging] Unrecognized Logging Level: {}"sv, Level);

    spdlog::error("[WasiLogging] Trace Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Trace));

    spdlog::error("[WasiLogging] Debug Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Debug));

    spdlog::error("[WasiLogging] Info Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Info));

    spdlog::error("[WasiLogging] Warn Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Warn));

    spdlog::error("[WasiLogging] Error Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Error));

    spdlog::error("[WasiLogging] Critical Level = {}"sv,

                  static_cast<uint32_t>(LogLevel::Critical));

    return Unexpect(ErrCode::Value::HostFuncError);

  }

  return {};

}

} // namespace WASILogging

} // namespace Host

} // namespace WasmEdge