// Copyright 2019-20 Genten Studios
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors
// may be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include <Client/Events/Event.hpp>
#include <Client/Events/IEventListener.hpp>

#include <Common/Singleton.hpp>
#include <Common/CMS/ModManager.hpp>

#include <functional>
#include <string>
#include <unordered_map>
#include <vector>

namespace phx::client
{
	struct Input
	{
		/// @brief The Human readable name displayed in menus
		std::string displayName;

		/// @brief The unique key used to identify input in save file and mods.
		/// In the format core::moveforward
		std::string uniqueKey;

		/// @brief The physical key assigned to this input
		events::Keys key = events::Keys::NONE;

		/// @brief The default key assigned to this input
		events::Keys defaultKey = events::Keys::NONE;
	};

	class InputMap : public Singleton<InputMap>, public events::IEventListener
	{
	public:
		using InputRef = int;

		InputMap();
		~InputMap();

		void registerAPI(cms::ModManager* manager);

		/**
		 * @brief Forwards call to any matching registered callbacks
		 *
		 * @param e The event that occured
		 */
		void onEvent(events::Event e) override;

		/**
		 * @brief Registers a new input in the registry
		 *
		 * @param uniqueName The unique name for the input in the format
		 * module.input
		 * @param displayName The name displayed to the user in the edit menu
		 * @param defaultKey The default key that is registered when the input
		 * is registered, this gets overridden if the user has defined the key
		 * or another input registers with the same key
		 * @return A pointer to the input
		 */
		Input* registerInput(const std::string& uniqueName,
		                     const std::string& displayName,
		                     events::Keys       defaultKey);

		/**
		 * @brief Attaches a callback to an input that is called when the key is
		 * pressed
		 *
		 * @param uniqueName The uniqueName of the input
		 * @param func The function that gets called on keypress
		 */
		void attachCallbackToInput(const std::string&           uniqueName,
		                           const std::function<void()>& func);
		/**
		 * @brief Attaches a callback to an input that is called when the key is
		 * pressed
		 *
		 * @param primaryKey The InputRef of the input
		 * @param func The function that gets called on keypress
		 */
		void attachCallbackToInput(InputRef                     primaryKey,
		                           const std::function<void()>& func);

		/**
		 * @brief Gets a pointer to an input
		 *
		 * @param uniqueName The uniqueName of the input
		 * @return A pointer to the input, if the input does not exist, will
		 * reply with key unknown.
		 */
		Input* getInput(const std::string& uniqueName);

		/**
		 * @brief Gets a pointer to an input
		 *
		 * @param primaryKey The InputRef of the input
		 * @return A pointer to the input, if the input does not exist, will
		 * reply with key unknown.
		 */
		Input* getInput(InputRef primaryKey);

		/**
		 * @brief Changes the key for the input
		 *
		 * @note Using the uniqueName is inefficient, if possible use the
		 * InputRef instead
		 *
		 * @param uniqueName The uniqueName of the key being modified
		 * @param key The new key being set
		 */
		void setInput(const std::string& uniqueName, events::Keys key);
		/**
		 * @brief Changes the key for the input
		 *
		 * @param primaryKey The InputRef of the key being modified
		 * @param key The new key being set
		 */
		void setInput(InputRef primaryKey, events::Keys key);

		// try to not use this, inefficient.
		bool getState(const std::string& uniqueName);
		/**
		 * @brief Gets the state of an input
		 * @param primaryKey The InputRef of the input
		 * @return Whether the key is pressed or not
		 */
		bool getState(InputRef primaryKey);
		/**
		 * @brief Gets the state of an input
		 * @param input A pointer to the input
		 * @return Whether the key is pressed or not
		 */
		bool getState(Input* input);

		/**
		 * @brief Gets the InputRef of a key based on its uniqueName
		 * @param uniqueName The uniqueName of the key
		 * @return The InputRef of the key
		 */
		InputRef getReference(const std::string& uniqueName);

	private:
		unsigned int                              m_currentInputRef = 0;
		std::unordered_map<std::string, InputRef> m_uniqueInputs;
		std::unordered_map<InputRef, Input>       m_inputs;

		// remember, input ref is just an int.
		std::unordered_map<InputRef, std::function<void()>> m_callbacks;
	};
} // namespace phx::client
