// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <algorithm>
#include <list>
#include <map>
#include <string>

#include "Common/CommonTypes.h"
#include "Common/Timer.h"

#include "Core/ConfigManager.h"

#include "VideoCommon/OnScreenDisplay.h"
#include "VideoCommon/RenderBase.h"

namespace OSD
{
static std::multimap<CallbackType, Callback> s_callbacks;
static std::multimap<MessageType, Message> s_messages;
static std::mutex s_messages_mutex;

void AddTypedMessage(MessageType type, const std::string& message, u32 ms, u32 rgba)
{
  std::lock_guard<std::mutex> lock(s_messages_mutex);
  s_messages.erase(type);
  s_messages.emplace(type, Message(message, Common::Timer::GetTimeMs() + ms, rgba));
}

void AddMessage(const std::string& message, u32 ms, u32 rgba)
{
  std::lock_guard<std::mutex> lock(s_messages_mutex);
  s_messages.emplace(MessageType::Typeless,
                     Message(message, Common::Timer::GetTimeMs() + ms, rgba));
}

void DrawMessage(const Message& msg, int top, int left, int time_left)
{
  float alpha = std::min(1.0f, std::max(0.0f, time_left / 1024.0f));
  u32 color = (msg.m_rgba & 0xFFFFFF) | ((u32)((msg.m_rgba >> 24) * alpha) << 24);

  g_renderer->RenderText(msg.m_str, left, top, color);
}

void DrawMessages()
{
  if (!SConfig::GetInstance().bOnScreenDisplayMessages)
    return;

  {
    std::lock_guard<std::mutex> lock(s_messages_mutex);

    u32 now = Common::Timer::GetTimeMs();
    int left = 20, top = 35;

    auto it = s_messages.begin();
    while (it != s_messages.end())
    {
      const Message& msg = it->second;
      int time_left = (int)(msg.m_timestamp - now);
      DrawMessage(msg, top, left, time_left);

      if (time_left <= 0)
        it = s_messages.erase(it);
      else
        ++it;
      top += 15;
    }
  }
}

void ClearMessages()
{
  std::lock_guard<std::mutex> lock(s_messages_mutex);
  s_messages.clear();
}

// On-Screen Display Callbacks
void AddCallback(CallbackType type, Callback cb)
{
  s_callbacks.emplace(type, cb);
}

void DoCallbacks(CallbackType type)
{
  auto it_bounds = s_callbacks.equal_range(type);
  for (auto it = it_bounds.first; it != it_bounds.second; ++it)
  {
    it->second();
  }

  // Wipe all callbacks on shutdown
  if (type == CallbackType::Shutdown)
    s_callbacks.clear();
}

}  // namespace