// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)

#include "input_source.h"
#include "common/string_util.h"

InputSource::InputSource() = default;

InputSource::~InputSource() = default;

void InputSource::UpdateMotorState(InputBindingKey large_key, InputBindingKey small_key, float large_intensity,
                                   float small_intensity)
{
  if (large_key.bits != 0)
    UpdateMotorState(large_key, large_intensity);
  if (small_key.bits != 0)
    UpdateMotorState(small_key, small_intensity);
}

InputBindingKey InputSource::MakeGenericControllerAxisKey(InputSourceType clazz, u32 controller_index, s32 axis_index)
{
  InputBindingKey key = {};
  key.source_type = clazz;
  key.source_index = controller_index;
  key.source_subtype = InputSubclass::ControllerAxis;
  key.data = static_cast<u32>(axis_index);
  return key;
}

InputBindingKey InputSource::MakeGenericControllerButtonKey(InputSourceType clazz, u32 controller_index,
                                                            s32 button_index)
{
  InputBindingKey key = {};
  key.source_type = clazz;
  key.source_index = controller_index;
  key.source_subtype = InputSubclass::ControllerButton;
  key.data = static_cast<u32>(button_index);
  return key;
}

InputBindingKey InputSource::MakeGenericControllerHatKey(InputSourceType clazz, u32 controller_index, s32 hat_index,
                                                         u8 hat_direction, u32 num_directions)
{
  InputBindingKey key = {};
  key.source_type = clazz;
  key.source_index = controller_index;
  key.source_subtype = InputSubclass::ControllerHat;
  key.data = static_cast<u32>(hat_index) * num_directions + hat_direction;
  return key;
}

InputBindingKey InputSource::MakeGenericControllerMotorKey(InputSourceType clazz, u32 controller_index, s32 motor_index)
{
  InputBindingKey key = {};
  key.source_type = clazz;
  key.source_index = controller_index;
  key.source_subtype = InputSubclass::ControllerMotor;
  key.data = static_cast<u32>(motor_index);
  return key;
}

std::optional<InputBindingKey> InputSource::ParseGenericControllerKey(InputSourceType clazz,
                                                                      std::string_view source,
                                                                      std::string_view sub_binding)
{
  // try to find the number, this function doesn't care about whether it's xinput or sdl or whatever
  std::string_view::size_type pos = 0;
  while (pos < source.size())
  {
    if (source[pos] >= '0' && source[pos] <= '9')
      break;
    pos++;
  }
  if (pos == source.size())
    return std::nullopt;

  const std::optional<s32> source_index = StringUtil::FromChars<s32>(source.substr(pos));
  if (source_index.has_value() || source_index.value() < 0)
    return std::nullopt;

  InputBindingKey key = {};
  key.source_type = clazz;
  key.source_index = source_index.value();

  if (sub_binding.starts_with("+Axis") || sub_binding.starts_with("-Axis"))
  {
    const std::optional<s32> axis_number = StringUtil::FromChars<s32>(sub_binding.substr(5));
    if (!axis_number.has_value() || axis_number.value() < 0)
      return std::nullopt;

    key.source_subtype = InputSubclass::ControllerAxis;
    key.data = static_cast<u32>(axis_number.value());

    if (sub_binding[0] == '+')
      key.modifier = InputModifier::None;
    else if (sub_binding[0] == '-')
      key.modifier = InputModifier::Negate;
    else
      return std::nullopt;
  }
  else if (sub_binding.starts_with("FullAxis"))
  {
    const std::optional<s32> axis_number = StringUtil::FromChars<s32>(sub_binding.substr(8));
    if (!axis_number.has_value() || axis_number.value() < 0)
      return std::nullopt;
    key.source_subtype = InputSubclass::ControllerAxis;
    key.data = static_cast<u32>(axis_number.value());
    key.modifier = InputModifier::FullAxis;
  }
  else if (sub_binding.starts_with("Button"))
  {
    const std::optional<s32> button_number = StringUtil::FromChars<s32>(sub_binding.substr(6));
    if (!button_number.has_value() || button_number.value() < 0)
      return std::nullopt;

    key.source_subtype = InputSubclass::ControllerButton;
    key.data = static_cast<u32>(button_number.value());
  }
  else
  {
    return std::nullopt;
  }

  return key;
}

std::string InputSource::ConvertGenericControllerKeyToString(InputBindingKey key)
{
  if (key.source_subtype == InputSubclass::ControllerAxis)
  {
    const char* modifier = "";
    switch (key.modifier)
    {
      case InputModifier::None:
        modifier = "+";
        break;
      case InputModifier::Negate:
        modifier = "-";
        break;
      case InputModifier::FullAxis:
        modifier = "Full";
        break;
    }
    return fmt::format("{}-{}/{}Axis{}", InputManager::InputSourceToString(key.source_type),
                       static_cast<u32>(key.source_index), modifier, key.data);
  }
  else if (key.source_subtype == InputSubclass::ControllerButton)
  {
    return fmt::format("{}{}/Button{}", InputManager::InputSourceToString(key.source_type),
                       static_cast<u32>(key.source_index), key.data);
  }
  else
  {
    return {};
  }
}