/*
Minetest
Copyright (C) 2010-2015 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include "../hud.h"
#include "irrlichttypes_extrabloated.h"
#include "util/thread.h"
#include "voxel.h"
#include <map>
#include <string>
#include <vector>

class Client;
class ITextureSource;
class IShaderSource;

#define MINIMAP_MAX_SX 512
#define MINIMAP_MAX_SY 512

enum MinimapShape {
	MINIMAP_SHAPE_SQUARE,
	MINIMAP_SHAPE_ROUND,
};

struct MinimapModeDef {
	MinimapType type;
	std::string label;
	u16 scan_height;
	u16 map_size;
	std::string texture;
	u16 scale;
};

struct MinimapMarker {
	MinimapMarker(scene::ISceneNode *parent_node):
		parent_node(parent_node)
	{
	}
	scene::ISceneNode *parent_node;
};
struct MinimapPixel {
	//! The topmost node that the minimap displays.
	MapNode n;
	u16 height;
	u16 air_count;
};

struct MinimapMapblock {
	void getMinimapNodes(VoxelManipulator *vmanip, const v3s16 &pos);

	MinimapPixel data[MAP_BLOCKSIZE * MAP_BLOCKSIZE];
};

struct MinimapData {
	MinimapModeDef mode;
	v3s16 pos;
	v3s16 old_pos;
	MinimapPixel minimap_scan[MINIMAP_MAX_SX * MINIMAP_MAX_SY];
	bool map_invalidated;
	bool minimap_shape_round;
	video::IImage *minimap_mask_round = nullptr;
	video::IImage *minimap_mask_square = nullptr;
	video::ITexture *texture = nullptr;
	video::ITexture *heightmap_texture = nullptr;
	bool textures_initialised = false; // True if the following textures are not nullptrs.
	video::ITexture *minimap_overlay_round = nullptr;
	video::ITexture *minimap_overlay_square = nullptr;
	video::ITexture *player_marker = nullptr;
	video::ITexture *object_marker_red = nullptr;
};

struct QueuedMinimapUpdate {
	v3s16 pos;
	MinimapMapblock *data = nullptr;
};

class MinimapUpdateThread : public UpdateThread {
public:
	MinimapUpdateThread() : UpdateThread("Minimap") {}
	virtual ~MinimapUpdateThread();

	void getMap(v3s16 pos, s16 size, s16 height);
	void enqueueBlock(v3s16 pos, MinimapMapblock *data);
	bool pushBlockUpdate(v3s16 pos, MinimapMapblock *data);
	bool popBlockUpdate(QueuedMinimapUpdate *update);

	MinimapData *data = nullptr;

protected:
	virtual void doUpdate();

private:
	std::mutex m_queue_mutex;
	std::deque<QueuedMinimapUpdate> m_update_queue;
	std::map<v3s16, MinimapMapblock *> m_blocks_cache;
};

class Minimap {
public:
	Minimap(Client *client);
	~Minimap();

	void addBlock(v3s16 pos, MinimapMapblock *data);

	v3f getYawVec();

	void setPos(v3s16 pos);
	v3s16 getPos() const { return data->pos; }
	void setAngle(f32 angle);
	f32 getAngle() const { return m_angle; }
	void toggleMinimapShape();
	void setMinimapShape(MinimapShape shape);
	MinimapShape getMinimapShape();

	void clearModes() { m_modes.clear(); };
	void addMode(MinimapModeDef mode);
	void addMode(MinimapType type, u16 size = 0, const std::string &label = "",
			const std::string &texture = "", u16 scale = 1);

	void setModeIndex(size_t index);
	size_t getModeIndex() const { return m_current_mode_index; };
	size_t getMaxModeIndex() const { return m_modes.size() - 1; };
	void nextMode();

	MinimapModeDef getModeDef() const { return data->mode; }

	video::IImage *getMinimapMask();
	video::ITexture *getMinimapTexture();

	void blitMinimapPixelsToImageRadar(video::IImage *map_image);
	void blitMinimapPixelsToImageSurface(video::IImage *map_image,
		video::IImage *heightmap_image);

	scene::SMeshBuffer *getMinimapMeshBuffer();

	MinimapMarker* addMarker(scene::ISceneNode *parent_node);
	void removeMarker(MinimapMarker **marker);

	void updateActiveMarkers();
	void drawMinimap(core::rect<s32> rect);

	video::IVideoDriver *driver;
	Client* client;
	MinimapData *data;

private:
	ITextureSource *m_tsrc;
	IShaderSource *m_shdrsrc;
	const NodeDefManager *m_ndef;
	MinimapUpdateThread *m_minimap_update_thread = nullptr;
	scene::SMeshBuffer *m_meshbuffer;
	bool m_enable_shaders;
	std::vector<MinimapModeDef> m_modes;
	size_t m_current_mode_index;
	u16 m_surface_mode_scan_height;
	f32 m_angle;
	std::mutex m_mutex;
	std::list<MinimapMarker*> m_markers;
	std::list<v2f> m_active_markers;
};
