// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

#ifndef SPDLOG_HEADER_ONLY
#include <spdlog/sinks/wincolor_sink.h>
#endif

#include <spdlog/details/windows_include.h>
#include <wincon.h>

#include <spdlog/common.h>
#include <spdlog/pattern_formatter.h>

namespace spdlog {
namespace sinks {
template<typename ConsoleMutex>
SPDLOG_INLINE wincolor_sink<ConsoleMutex>::wincolor_sink(void *out_handle, color_mode mode)
    : out_handle_(out_handle)
    , mutex_(ConsoleMutex::mutex())
    , formatter_(details::make_unique<spdlog::pattern_formatter>())
{

    set_color_mode_impl(mode);
    // set level colors
    colors_[level::trace] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;     // white
    colors_[level::debug] = FOREGROUND_GREEN | FOREGROUND_BLUE;                      // cyan
    colors_[level::info] = FOREGROUND_GREEN;                                         // green
    colors_[level::warn] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY; // intense yellow
    colors_[level::err] = FOREGROUND_RED | FOREGROUND_INTENSITY;                     // intense red
    colors_[level::critical] =
        BACKGROUND_RED | FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY; // intense white on red background
    colors_[level::off] = 0;
}

template<typename ConsoleMutex>
SPDLOG_INLINE wincolor_sink<ConsoleMutex>::~wincolor_sink()
{
    this->flush();
}

// change the color for the given level
template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level::level_enum level, std::uint16_t color)
{
    std::lock_guard<mutex_t> lock(mutex_);
    colors_[level] = color;
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::log(const details::log_msg &msg)
{
    if (out_handle_ == nullptr || out_handle_ == INVALID_HANDLE_VALUE)
    {
        return;
    }

    std::lock_guard<mutex_t> lock(mutex_);
    msg.color_range_start = 0;
    msg.color_range_end = 0;
    memory_buf_t formatted;
    formatter_->format(msg, formatted);
    if (should_do_colors_ && msg.color_range_end > msg.color_range_start)
    {
        // before color range
        print_range_(formatted, 0, msg.color_range_start);
        // in color range
        auto orig_attribs = static_cast<WORD>(set_foreground_color_(colors_[msg.level]));
        print_range_(formatted, msg.color_range_start, msg.color_range_end);
        // reset to orig colors
        ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), orig_attribs);
        print_range_(formatted, msg.color_range_end, formatted.size());
    }
    else // print without colors if color range is invalid (or color is disabled)
    {
        write_to_file_(formatted);
    }
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::flush()
{
    // windows console always flushed?
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_pattern(const std::string &pattern)
{
    std::lock_guard<mutex_t> lock(mutex_);
    formatter_ = std::unique_ptr<spdlog::formatter>(new pattern_formatter(pattern));
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter)
{
    std::lock_guard<mutex_t> lock(mutex_);
    formatter_ = std::move(sink_formatter);
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
{
    std::lock_guard<mutex_t> lock(mutex_);
    set_color_mode_impl(mode);
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode_impl(color_mode mode)
{
    if (mode == color_mode::automatic)
    {
        // should do colors only if out_handle_  points to actual console.
        DWORD console_mode;
        bool in_console = ::GetConsoleMode(static_cast<HANDLE>(out_handle_), &console_mode) != 0;
        should_do_colors_ = in_console;
    }
    else
    {
        should_do_colors_ = mode == color_mode::always ? true : false;
    }
}

// set foreground color and return the orig console attributes (for resetting later)
template<typename ConsoleMutex>
std::uint16_t SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_foreground_color_(std::uint16_t attribs)
{
    CONSOLE_SCREEN_BUFFER_INFO orig_buffer_info;
    if (!::GetConsoleScreenBufferInfo(static_cast<HANDLE>(out_handle_), &orig_buffer_info))
    {
        // just return white if failed getting console info
        return FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE; 
    }
    
    // change only the foreground bits (lowest 4 bits) 
    auto new_attribs = static_cast<WORD>(attribs) | (orig_buffer_info.wAttributes & 0xfff0);
    auto ignored = ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), static_cast<WORD>(new_attribs));
    (void)(ignored);
    return static_cast<std::uint16_t>(orig_buffer_info.wAttributes); // return orig attribs
}

// print a range of formatted message to console
template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted, size_t start, size_t end)
{
    if (end > start)
    {
        auto size = static_cast<DWORD>(end - start);
        auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start, size, nullptr, nullptr);
        (void)(ignored);
    }
}

template<typename ConsoleMutex>
void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::write_to_file_(const memory_buf_t &formatted)
{
    auto size = static_cast<DWORD>(formatted.size());
    DWORD bytes_written = 0;
    auto ignored = ::WriteFile(static_cast<HANDLE>(out_handle_), formatted.data(), size, &bytes_written, nullptr);
    (void)(ignored);
}

// wincolor_stdout_sink
template<typename ConsoleMutex>
SPDLOG_INLINE wincolor_stdout_sink<ConsoleMutex>::wincolor_stdout_sink(color_mode mode)
    : wincolor_sink<ConsoleMutex>(::GetStdHandle(STD_OUTPUT_HANDLE), mode)
{}

// wincolor_stderr_sink
template<typename ConsoleMutex>
SPDLOG_INLINE wincolor_stderr_sink<ConsoleMutex>::wincolor_stderr_sink(color_mode mode)
    : wincolor_sink<ConsoleMutex>(::GetStdHandle(STD_ERROR_HANDLE), mode)
{}
} // namespace sinks
} // namespace spdlog
