// Copyright 2019 The Dawn Authors
//
// 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
//
//     http://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.

#include "common/Log.h"

#include "common/Assert.h"
#include "common/Platform.h"

#include <cstdio>

#if defined(DAWN_PLATFORM_ANDROID)
#    include <android/log.h>
#endif

namespace {

    const char* SeverityName(LogSeverity severity) {
        switch (severity) {
            case LogSeverity::Debug:
                return "Debug";
            case LogSeverity::Info:
                return "Info";
            case LogSeverity::Warning:
                return "Warning";
            case LogSeverity::Error:
                return "Error";
            default:
                UNREACHABLE();
                return "";
        }
    }

#if defined(DAWN_PLATFORM_ANDROID)
    android_LogPriority AndroidLogPriority(LogSeverity severity) {
        switch (severity) {
            case LogSeverity::Debug:
                return ANDROID_LOG_INFO;
            case LogSeverity::Info:
                return ANDROID_LOG_INFO;
            case LogSeverity::Warning:
                return ANDROID_LOG_WARN;
            case LogSeverity::Error:
                return ANDROID_LOG_ERROR;
            default:
                UNREACHABLE();
                return ANDROID_LOG_ERROR;
        }
    }
#endif  // defined(DAWN_PLATFORM_ANDROID)

}  // anonymous namespace

LogMessage::LogMessage(LogSeverity severity) : mSeverity(severity) {
}

LogMessage::~LogMessage() {
    std::string fullMessage = mStream.str();

    // If this message has been moved, its stream is empty.
    if (fullMessage.empty()) {
        return;
    }

    const char* severityName = SeverityName(mSeverity);

    FILE* outputStream = stdout;
    if (mSeverity == LogSeverity::Warning || mSeverity == LogSeverity::Error) {
        outputStream = stderr;
    }

#if defined(DAWN_PLATFORM_ANDROID)
    android_LogPriority androidPriority = AndroidLogPriority(mSeverity);
    __android_log_print(androidPriority, "Dawn", "%s: %s\n", severityName, fullMessage.c_str());
#else   // defined(DAWN_PLATFORM_ANDROID)
    // Note: we use fprintf because <iostream> includes static initializers.
    fprintf(outputStream, "%s: %s\n", severityName, fullMessage.c_str());
    fflush(outputStream);
#endif  // defined(DAWN_PLATFORM_ANDROID)
}

LogMessage DebugLog() {
    return {LogSeverity::Debug};
}

LogMessage InfoLog() {
    return {LogSeverity::Info};
}

LogMessage WarningLog() {
    return {LogSeverity::Warning};
}

LogMessage ErrorLog() {
    return {LogSeverity::Error};
}

LogMessage DebugLog(const char* file, const char* function, int line) {
    LogMessage message = DebugLog();
    message << file << ":" << line << "(" << function << ")";
    return message;
}