// 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
{
struct Message
{
  Message() {}
  Message(const std::string& s, u32 ts, u32 rgba) : m_str(s), m_timestamp(ts), m_rgba(rgba) {}
  std::string m_str;
  u32 m_timestamp;
  u32 m_rgba;
};

static std::multimap<CallbackType, Callback> s_callbacks;
static std::list<Message> s_msgList;

void AddMessage(const std::string& str, u32 ms, u32 rgba)
{
  s_msgList.emplace_back(str, Common::Timer::GetTimeMs() + ms, rgba);
}

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

  int left = 25, top = 15;
  auto it = s_msgList.begin();
  while (it != s_msgList.end())
  {
    int time_left = (int)(it->m_timestamp - Common::Timer::GetTimeMs());
    float alpha = std::max(1.0f, std::min(0.0f, time_left / 1024.0f));
    u32 color = (it->m_rgba & 0xFFFFFF) | ((u32)((it->m_rgba >> 24) * alpha) << 24);

    g_renderer->RenderText(it->m_str, left, top, color);

    top += 15;

    if (time_left <= 0)
      it = s_msgList.erase(it);
    else
      ++it;
  }
}

void ClearMessages()
{
  s_msgList.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
