/*
 * VisualLogger.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 "../int3.h"
#include "../constants/EntityIdentifiers.h"
#include "../battle/BattleHex.h"
#include "../Color.h"

VCMI_LIB_NAMESPACE_BEGIN

class IMapOverlayLogVisualizer
{
public:
	virtual void drawLine(int3 start, int3 end) = 0;
	virtual void drawText(int3 tile, int lineNumber, const std::string & text, const std::optional<ColorRGBA> & color) = 0;
};

class IBattleOverlayLogVisualizer
{
public:
	virtual void drawText(BattleHex tile, int lineNumber, const std::string & text) = 0;
};

class DLL_LINKAGE IVisualLogBuilder
{
public:
	virtual void addLine(int3 start, int3 end) = 0;
	virtual void addText(int3 tile, const std::string & text, const std::optional<ColorRGBA> & color = {}) = 0;
	virtual void addText(BattleHex tile, const std::string & text) = 0;

	void addText(int3 tile, const std::string & text, PlayerColor background);
};

/// The logger is used to show screen overlay
class DLL_LINKAGE VisualLogger
{
private:
	template<typename T>
	struct Line
	{
		T start;
		T end;

		Line(T start, T end)
			:start(start), end(end)
		{
		}
	};

	template<typename T>
	struct Text
	{
		T tile;
		std::string text;
		std::optional<ColorRGBA> background;

		Text(T tile, std::string text, std::optional<ColorRGBA> background)
			:tile(tile), text(text), background(background)
		{
		}
	};

	class VisualLogBuilder : public IVisualLogBuilder
	{
	private:
		std::vector<Line<int3>> & mapLines;
		std::vector<Text<BattleHex>> & battleTexts;
		std::vector<Text<int3>> & mapTexts;

	public:
		VisualLogBuilder(
			std::vector<Line<int3>> & mapLines,
			std::vector<Text<int3>> & mapTexts,
			std::vector<Text<BattleHex>> & battleTexts)
			:mapLines(mapLines), mapTexts(mapTexts), battleTexts(battleTexts)
		{
		}

		void addLine(int3 start, int3 end) override
		{
			mapLines.emplace_back(start, end);
		}

		void addText(BattleHex tile, const std::string & text) override
		{
			battleTexts.emplace_back(tile, text, std::optional<ColorRGBA>());
		}

		void addText(int3 tile, const std::string & text, const std::optional<ColorRGBA> & background) override
		{
			mapTexts.emplace_back(tile, text, background);
		}
	};

private:
	std::map<std::string, std::vector<Line<int3>>> mapLines;
	std::map<std::string, std::vector<Text<int3>>> mapTexts;
	std::map<std::string, std::vector<Text<BattleHex>>> battleTexts;
	std::mutex mutex;
	std::string keyToShow;

public:

	void updateWithLock(const std::string & channel, const std::function<void(IVisualLogBuilder & logBuilder)> & func);
	void visualize(IMapOverlayLogVisualizer & visulizer);
	void visualize(IBattleOverlayLogVisualizer & visulizer);
	void setKey(const std::string & key);
};

extern DLL_LINKAGE VisualLogger * logVisual;

VCMI_LIB_NAMESPACE_END