// Copyright 2016 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "InputCommon/ControlReference/ControlReference.h"

// For InputGateOn()
// This is a bad layering violation, but it's the cleanest
// place I could find to put it.
#include "Core/ConfigManager.h"
#include "Core/Host.h"

using namespace ciface::ExpressionParser;

bool ControlReference::InputGateOn()
{
  return SConfig::GetInstance().m_BackgroundInput || Host_RendererHasFocus() ||
         Host_UINeedsControllerState();
}

//
// UpdateReference
//
// Updates a controlreference's binded devices/controls
// need to call this to re-bind a control reference after changing its expression
//
void ControlReference::UpdateReference(const ciface::Core::DeviceContainer& devices,
                                       const ciface::Core::DeviceQualifier& default_device)
{
  ControlFinder finder(devices, default_device, IsInput());
  if (m_parsed_expression)
    m_parsed_expression->UpdateReferences(finder);
}

int ControlReference::BoundCount() const
{
  if (m_parsed_expression)
    return m_parsed_expression->CountNumControls();
  else
    return 0;
}

ParseStatus ControlReference::GetParseStatus() const
{
  return m_parse_status;
}

std::string ControlReference::GetExpression() const
{
  return m_expression;
}

void ControlReference::SetExpression(std::string expr)
{
  m_expression = std::move(expr);
  std::tie(m_parse_status, m_parsed_expression) = ParseExpression(m_expression);
}

ControlReference::ControlReference() : range(1), m_parsed_expression(nullptr)
{
}

ControlReference::~ControlReference() = default;

InputReference::InputReference() : ControlReference()
{
}

OutputReference::OutputReference() : ControlReference()
{
}

bool InputReference::IsInput() const
{
  return true;
}
bool OutputReference::IsInput() const
{
  return false;
}

//
// InputReference :: State
//
// Gets the state of an input reference
// override function for ControlReference::State ...
//
ControlState InputReference::State(const ControlState ignore)
{
  if (m_parsed_expression && InputGateOn())
    return m_parsed_expression->GetValue() * range;
  return 0.0;
}

//
// OutputReference :: State
//
// Set the state of all binded outputs
// overrides ControlReference::State .. combined them so I could make the GUI simple / inputs ==
// same as outputs one list
// I was lazy and it works so watever
//
ControlState OutputReference::State(const ControlState state)
{
  if (m_parsed_expression)
    m_parsed_expression->SetValue(state * range);
  return 0.0;
}