/*
 *  Copyright (C) 2017-2018 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#include "KeymapHandler.h"

#include "KeyHandler.h"
#include "games/controllers/Controller.h"
#include "input/IKeymap.h"
#include "input/IKeymapEnvironment.h"
#include "input/InputTranslator.h"
#include "input/joysticks/JoystickEasterEgg.h"
#include "input/joysticks/JoystickTranslator.h"
#include "input/joysticks/JoystickUtils.h"
#include "input/joysticks/interfaces/IKeyHandler.h"

#include <algorithm>
#include <assert.h>
#include <cmath>
#include <utility>

using namespace KODI;
using namespace JOYSTICK;

CKeymapHandler::CKeymapHandler(IActionListener* actionHandler, const IKeymap* keymap)
  : m_actionHandler(actionHandler), m_keymap(keymap)
{
  assert(m_actionHandler != nullptr);
  assert(m_keymap != nullptr);

  if (m_keymap->Environment()->UseEasterEgg())
    m_easterEgg.reset(new CJoystickEasterEgg(ControllerID()));
}

bool CKeymapHandler::HotkeysPressed(const std::set<std::string>& keyNames) const
{
  bool bHotkeysPressed = true;

  for (const auto& hotkey : keyNames)
  {
    auto it = m_keyHandlers.find(hotkey);
    if (it == m_keyHandlers.end() || !it->second->IsPressed())
    {
      bHotkeysPressed = false;
      break;
    }
  }

  return bHotkeysPressed;
}

std::string CKeymapHandler::ControllerID() const
{
  return m_keymap->ControllerID();
}

bool CKeymapHandler::AcceptsInput(const FeatureName& feature) const
{
  if (HasAction(CJoystickUtils::MakeKeyName(feature)))
    return true;

  for (auto dir : CJoystickUtils::GetAnalogStickDirections())
  {
    if (HasAction(CJoystickUtils::MakeKeyName(feature, dir)))
      return true;
  }

  return false;
}

bool CKeymapHandler::OnButtonPress(const FeatureName& feature, bool bPressed)
{
  if (bPressed && m_easterEgg && m_easterEgg->OnButtonPress(feature))
    return true;

  const std::string keyName = CJoystickUtils::MakeKeyName(feature);

  IKeyHandler* handler = GetKeyHandler(keyName);
  return handler->OnDigitalMotion(bPressed, 0);
}

void CKeymapHandler::OnButtonHold(const FeatureName& feature, unsigned int holdTimeMs)
{
  if (m_easterEgg && m_easterEgg->IsCapturing())
    return;

  const std::string keyName = CJoystickUtils::MakeKeyName(feature);

  IKeyHandler* handler = GetKeyHandler(keyName);
  handler->OnDigitalMotion(true, holdTimeMs);
}

bool CKeymapHandler::OnButtonMotion(const FeatureName& feature,
                                    float magnitude,
                                    unsigned int motionTimeMs)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature);

  IKeyHandler* handler = GetKeyHandler(keyName);
  return handler->OnAnalogMotion(magnitude, motionTimeMs);
}

bool CKeymapHandler::OnAnalogStickMotion(const FeatureName& feature,
                                         float x,
                                         float y,
                                         unsigned int motionTimeMs)
{
  using namespace INPUT;

  bool bHandled = false;

  // Calculate the direction of the stick's position
  const ANALOG_STICK_DIRECTION analogStickDir = CInputTranslator::VectorToCardinalDirection(x, y);

  // Calculate the magnitude projected onto that direction
  const float magnitude = std::max(std::fabs(x), std::fabs(y));

  // Deactivate directions in which the stick is not pointing first
  for (auto dir : CJoystickUtils::GetAnalogStickDirections())
  {
    if (dir != analogStickDir)
      DeactivateDirection(feature, dir);
  }

  // Now activate direction the analog stick is pointing
  if (analogStickDir != ANALOG_STICK_DIRECTION::NONE)
    bHandled = ActivateDirection(feature, magnitude, analogStickDir, motionTimeMs);

  return bHandled;
}

bool CKeymapHandler::OnWheelMotion(const FeatureName& feature,
                                   float position,
                                   unsigned int motionTimeMs)
{
  bool bHandled = false;

  // Calculate the direction of the wheel's position
  const WHEEL_DIRECTION direction = CJoystickTranslator::PositionToWheelDirection(position);

  // Calculate the magnitude projected onto that direction
  const float magnitude = std::fabs(position);

  // Deactivate directions in which the wheel is not pointing first
  for (auto dir : CJoystickUtils::GetWheelDirections())
  {
    if (dir != direction)
      DeactivateDirection(feature, dir);
  }

  // Now activate direction in which the wheel is positioned
  if (direction != WHEEL_DIRECTION::NONE)
    bHandled = ActivateDirection(feature, magnitude, direction, motionTimeMs);

  return bHandled;
}

bool CKeymapHandler::OnThrottleMotion(const FeatureName& feature,
                                      float position,
                                      unsigned int motionTimeMs)
{
  bool bHandled = false;

  // Calculate the direction of the throttle's position
  const THROTTLE_DIRECTION direction = CJoystickTranslator::PositionToThrottleDirection(position);

  // Calculate the magnitude projected onto that direction
  const float magnitude = std::fabs(position);

  // Deactivate directions in which the throttle is not pointing first
  for (auto dir : CJoystickUtils::GetThrottleDirections())
  {
    if (dir != direction)
      DeactivateDirection(feature, dir);
  }

  // Now activate direction in which the throttle is positioned
  if (direction != THROTTLE_DIRECTION::NONE)
    bHandled = ActivateDirection(feature, magnitude, direction, motionTimeMs);

  return bHandled;
}

bool CKeymapHandler::OnAccelerometerMotion(const FeatureName& feature, float x, float y, float z)
{
  return false; //! @todo implement
}

bool CKeymapHandler::ActivateDirection(const FeatureName& feature,
                                       float magnitude,
                                       ANALOG_STICK_DIRECTION dir,
                                       unsigned int motionTimeMs)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  return handler->OnAnalogMotion(magnitude, motionTimeMs);
}

void CKeymapHandler::DeactivateDirection(const FeatureName& feature, ANALOG_STICK_DIRECTION dir)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  handler->OnAnalogMotion(0.0f, 0);
}

bool CKeymapHandler::ActivateDirection(const FeatureName& feature,
                                       float magnitude,
                                       WHEEL_DIRECTION dir,
                                       unsigned int motionTimeMs)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  return handler->OnAnalogMotion(magnitude, motionTimeMs);
}

void CKeymapHandler::DeactivateDirection(const FeatureName& feature, WHEEL_DIRECTION dir)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  handler->OnAnalogMotion(0.0f, 0);
}

bool CKeymapHandler::ActivateDirection(const FeatureName& feature,
                                       float magnitude,
                                       THROTTLE_DIRECTION dir,
                                       unsigned int motionTimeMs)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  return handler->OnAnalogMotion(magnitude, motionTimeMs);
}

void CKeymapHandler::DeactivateDirection(const FeatureName& feature, THROTTLE_DIRECTION dir)
{
  const std::string keyName = CJoystickUtils::MakeKeyName(feature, dir);

  IKeyHandler* handler = GetKeyHandler(keyName);
  handler->OnAnalogMotion(0.0f, 0);
}

IKeyHandler* CKeymapHandler::GetKeyHandler(const std::string& keyName)
{
  auto it = m_keyHandlers.find(keyName);
  if (it == m_keyHandlers.end())
  {
    std::unique_ptr<IKeyHandler> handler(new CKeyHandler(keyName, m_actionHandler, m_keymap, this));
    m_keyHandlers.insert(std::make_pair(keyName, std::move(handler)));
    it = m_keyHandlers.find(keyName);
  }

  return it->second.get();
}

bool CKeymapHandler::HasAction(const std::string& keyName) const
{
  bool bHasAction = false;

  const auto& actions = m_keymap->GetActions(keyName).actions;
  for (const auto& action : actions)
  {
    if (HotkeysPressed(action.hotkeys))
    {
      bHasAction = true;
      break;
    }
  }

  return bHasAction;
}
