/*
 * GameSettings.h, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */
#pragma once

#include "IGameSettings.h"
#include "json/JsonNode.h"

VCMI_LIB_NAMESPACE_BEGIN

class DLL_LINKAGE GameSettings final : public IGameSettings, boost::noncopyable
{
	struct SettingOption
	{
		EGameSettings setting;
		std::string group;
		std::string key;
	};

	static constexpr int32_t OPTIONS_COUNT = static_cast<int32_t>(EGameSettings::OPTIONS_COUNT);
	static const std::vector<SettingOption> settingProperties;

	// contains base settings, like those defined in base game or mods
	std::array<JsonNode, OPTIONS_COUNT> baseSettings;
	// contains settings that were overriden, in map or in random map template
	std::array<JsonNode, OPTIONS_COUNT> overridenSettings;
	// for convenience / performance, contains actual settings - combined version of base and override settings
	std::array<JsonNode, OPTIONS_COUNT> actualSettings;

	// converts all existing overrides into a single json node for serialization
	JsonNode getAllOverrides() const;

public:
	GameSettings();
	~GameSettings();

	/// Loads settings as 'base settings' that can be overriden
	/// For settings defined in vcmi or in mods
	void loadBase(const JsonNode & input);

	/// Loads setting as an override, for use in maps or rmg templates
	/// undefined behavior if setting was already overriden (TODO: decide which approach is better - replace or append)
	void addOverride(EGameSettings option, const JsonNode & input);

	// loads all overrides from provided json node, for deserialization
	void loadOverrides(const JsonNode &);

	JsonNode getFullConfig() const override;
	const JsonNode & getValue(EGameSettings option) const override;

	template<typename Handler>
	void serialize(Handler & h)
	{
		if (h.saving)
		{
			JsonNode overrides = getAllOverrides();
			h & overrides;
		}
		else
		{
			JsonNode overrides;
			h & overrides;
			loadOverrides(overrides);
		}
	}
};

VCMI_LIB_NAMESPACE_END