// Copyright 2014 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <map>
#include <string>
#include <vector>

#include "Common/StringUtil.h"
#include "Common/Timer.h"

#include "VideoCommon/VideoCommon.h"

class PostProcessingShaderConfiguration
{
public:
	struct ConfigurationOption
	{
		enum OptionType
		{
			OPTION_BOOL = 0,
			OPTION_FLOAT,
			OPTION_INTEGER,
		};

		bool m_bool_value;

		std::vector<float> m_float_values;
		std::vector<s32> m_integer_values;

		std::vector<float> m_float_min_values;
		std::vector<s32> m_integer_min_values;

		std::vector<float> m_float_max_values;
		std::vector<s32> m_integer_max_values;

		std::vector<float> m_float_step_values;
		std::vector<s32> m_integer_step_values;

		OptionType m_type;

		std::string m_gui_name;
		std::string m_option_name;
		std::string m_dependent_option;
		bool m_dirty;
	};

	typedef std::map<std::string, ConfigurationOption> ConfigMap;

	PostProcessingShaderConfiguration() : m_current_shader("") {}
	virtual ~PostProcessingShaderConfiguration() {}

	// Loads the configuration with a shader
	// If the argument is "" the class will load the shader from the g_activeConfig option.
	// Returns the loaded shader source from file
	std::string LoadShader(std::string shader = "");
	void SaveOptionsConfiguration();
	void ReloadShader();
	std::string GetShader() { return m_current_shader; }

	bool IsDirty() { return m_any_options_dirty; }
	void SetDirty(bool dirty) { m_any_options_dirty = dirty; }

	bool HasOptions() { return m_options.size() > 0; }
	ConfigMap& GetOptions() { return m_options; }
	const ConfigurationOption& GetOption(const std::string& option) { return m_options[option]; }

	// For updating option's values
	void SetOptionf(const std::string& option, int index, float value);
	void SetOptioni(const std::string& option, int index, s32 value);
	void SetOptionb(const std::string& option, bool value);

private:
	bool m_any_options_dirty;
	std::string m_current_shader;
	ConfigMap m_options;

	void LoadOptions(const std::string& code);
	void LoadOptionsConfiguration();
};

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

	PostProcessingShaderConfiguration* GetConfig() { return &m_config; }

	// Should be implemented by the backends for backend specific code
	virtual void BlitFromTexture(TargetRectangle src, TargetRectangle dst,
	                             int src_texture, int src_width, int src_height, int layer = 0) = 0;
	virtual void ApplyShader() = 0;

protected:
	// Timer for determining our time value
	Common::Timer m_timer;

	PostProcessingShaderConfiguration m_config;
};
