// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)

#pragma once

#include <memory>
#include <mutex>
#include <optional>
#include <string_view>
#include <utility>
#include <vector>

#include "common/small_string.h"
#include "common/types.h"
#include "input_manager.h"

class SettingsInterface;

class InputSource
{
public:
  InputSource();
  virtual ~InputSource();

  virtual bool Initialize(SettingsInterface& si, std::unique_lock<std::mutex>& settings_lock) = 0;
  virtual void UpdateSettings(SettingsInterface& si, std::unique_lock<std::mutex>& settings_lock) = 0;
  virtual bool ReloadDevices() = 0;
  virtual void Shutdown() = 0;

  virtual void PollEvents() = 0;

  virtual std::optional<InputBindingKey> ParseKeyString(std::string_view device, std::string_view binding) = 0;
  virtual TinyString ConvertKeyToString(InputBindingKey key) = 0;
  virtual TinyString ConvertKeyToIcon(InputBindingKey key) = 0;

  /// Enumerates available devices. Returns a pair of the prefix (e.g. SDL-0) and the device name.
  virtual std::vector<std::pair<std::string, std::string>> EnumerateDevices() = 0;

  /// Enumerates available vibration motors at the time of call.
  virtual std::vector<InputBindingKey> EnumerateMotors() = 0;

  /// Retrieves bindings that match the generic bindings for the specified device.
  /// Returns false if it's not one of our devices.
  virtual bool GetGenericBindingMapping(std::string_view device, GenericInputBindingMapping* mapping) = 0;

  /// Informs the source of a new vibration motor state. Changes may not take effect until the next PollEvents() call.
  virtual void UpdateMotorState(InputBindingKey key, float intensity) = 0;

  /// Concurrently update both motors where possible, to avoid redundant packets.
  virtual void UpdateMotorState(InputBindingKey large_key, InputBindingKey small_key, float large_intensity,
                                float small_intensity);

  /// Creates a key for a generic controller axis event.
  static InputBindingKey MakeGenericControllerAxisKey(InputSourceType clazz, u32 controller_index, s32 axis_index);

  /// Creates a key for a generic controller button event.
  static InputBindingKey MakeGenericControllerButtonKey(InputSourceType clazz, u32 controller_index, s32 button_index);

  /// Creates a key for a generic controller hat event.
  static InputBindingKey MakeGenericControllerHatKey(InputSourceType clazz, u32 controller_index, s32 hat_index,
                                                     u8 hat_direction, u32 num_directions);

  /// Creates a key for a generic controller motor event.
  static InputBindingKey MakeGenericControllerMotorKey(InputSourceType clazz, u32 controller_index, s32 motor_index);

  /// Parses a generic controller key string.
  static std::optional<InputBindingKey> ParseGenericControllerKey(InputSourceType clazz, std::string_view source,
                                                                  std::string_view sub_binding);

  /// Converts a generic controller key to a string.
  static std::string ConvertGenericControllerKeyToString(InputBindingKey key);

#ifdef _WIN32
  static std::unique_ptr<InputSource> CreateDInputSource();
  static std::unique_ptr<InputSource> CreateXInputSource();
  static std::unique_ptr<InputSource> CreateWin32RawInputSource();
#endif
#ifndef __ANDROID__
  static std::unique_ptr<InputSource> CreateSDLSource();
#else
  static std::unique_ptr<InputSource> CreateAndroidSource();
#endif
};
