/*
   core/entity.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2.
*/

#ifndef __INCLUDED_CORE_ENTITY_H__
#define __INCLUDED_CORE_ENTITY_H__

#include <iostream>
#include <string>
#include <map>
#include <list>

#include "model/model.h"
#include "math/axis.h"
#include "math/mathlib.h"

namespace core
{

class Entity;
class EntityControlable;

}

#include "core/extension.h"
#include "core/descriptions.h"
#include "core/player.h"
#include "core/zone.h"

namespace core
{

/// The base world entity. All gameworld entities must derive from this class.
class Entity
{
	friend class Extension;

public:
	/// Entity flags
	enum Flags {Static = 1, Solid = 2, Bright = 4, Dockable = 8, ShowOnMap = 16};

	/// Entity type constants
	enum Type {Default = 0, Dynamic = 1, Controlable = 2, Globe = 3};

	/// Entity shape constants
	enum Shape {Diamond = 0, Sphere = 1, Cube = 2, Axis = 3};

	/// EntityDynamic State constants
	enum State {Normal = 0, NoPower = 1, ImpulseInitiate = 2, Impulse = 3, JumpInitiate = 4, Jump = 5, Docked = 6, Destroyed = 7};

	/// entity menus collection typedef
	typedef std::list<MenuDescription *> Menus;

	/// create a new entity and add it to the registry
	Entity(const unsigned int flags = 0);

	/// create an entity from stream data
	Entity(std::istream & is);

	/// destroy an entity
	virtual ~Entity();

	/*----- inspectors ------------------------------------------------ */

	/// entity id
	inline const unsigned int id() const {
		return entity_id;
	}

	/// module type id
	inline const unsigned int moduletype() const {
		return entity_moduletypeid;
	}

	///  core type id
	virtual inline const unsigned int type() const {
		return Default;
	}

	/// entity flags
	inline const unsigned int flags() const {
		return entity_flags;
	}

	/// returns true of a flag is set
	inline const bool flag_is_set(const Flags flag) const {
		return ((entity_flags & (unsigned int)flag) == (unsigned int)flag);
	}

	/// entity label (can not contain double quotes ")
	inline const std::string& label() const {
		return entity_label;
	}

	/// entity name (can not contain double qoutes ")
	inline const std::string & name() const {
		return entity_name;
	}

	/// pointer to the model, is used client-side
	inline model::Model * model() {
		return entity_model;
	}

	/// modelname
	inline const std::string & modelname() const {
		return entity_modelname;
	}

	/// pointer to the zone the entity belongs to
	inline Zone *zone() const {
		return entity_zone;
	}

	/// the zone the entity left in case of a zone change
	inline Zone *oldzone() const {
		return entity_oldzone;
	}

	/// dirty flag
	inline bool dirty() const {
		return entity_dirty;
	}

	/// entity location
	inline const math::Vector3f& location() const {
		return entity_location;
	}

	/// local coordinate system of the entity
	inline const math::Axis& axis() const {
		return entity_axis;
	}

	/// primary color of the entity
	inline const math::Color& color() const {
		return entity_color;
	}

	/// secondary
	inline const math::Color& color_second() const {
		return entity_color_second;
	}

	/// base shape of the entity
	inline const Shape shape() const {
		return entity_shape;
	}

	/// base radius of the entity
	inline const float radius() const {
		return entity_radius;
	}

	/// current speed of the entity in game units per second
	inline const float speed() const {
		return entity_speed;
	}

	/// indicates a server-side entity
	inline const bool serverside() const {
		return entity_serverside;
	}

	/// general visibility
	inline const bool visible() const {
		return entity_visible;
	}

	/// entity menus
	inline Menus &menus() {
		return entity_menus;
	}

	/// extensions
	inline Extension *extension(size_t type) const {
		return entity_extension[type];
	}

	/// find a menu
	MenuDescription *find_menu(const std::string &label);


	/* ---- mutators -------------------------------------------------- */

	/// assign entity color
	inline void set_color(const math::Color &color) {
		entity_color.assign(color);
	}

	/// assign entity secondary color
	inline void set_color_second(const math::Color &color) {
		entity_color_second.assign(color);
	}

	/// set dirty flag
	inline void set_dirty(const bool dirty = true) {
		entity_dirty = dirty;
	}

	/// mark the entity as destroyed
	virtual void die();

	/// runs one game frame for the entity
	/**
	 * The default implementation does nothing
	 */
	virtual void frame(float seconds);

	/**
	 * @brief set the zone the entity is currently in
	 *
	 * this fuction removes the entity from its previous zone
	 * and removes it to the new one, if it is not 0
	 */
	virtual void set_zone(Zone *zone);

	/// set the label
	void set_label(const char *label);

	/// set the label
	void set_label(const std::string &label);

	/// set the name
	void set_name(const char *name);

	/// set the name
	void set_name(const std::string &name);

	/// set visibility
	inline void set_visible(const bool visible = true) {
		entity_visible = visible;
	}

	/// set as server-side entity
	inline void set_serverside(const bool serverside = true) {
		entity_serverside = serverside;
	}

	/// set the model name and load the model
	void set_modelname(const std:: string &model);

	/// set the model
	void set_model(model::Model *model);

	/// set entity radius
	inline void set_radius(const float radius) {
		entity_radius = radius;
	}

	/* ---- actors ---------------------------------------------------- */

	/// called when the entity received a docking request
	virtual void dock(core::Entity *entity);

	/// set flags
	inline void set_flag(Flags flag) {
		entity_flags |= flag;
	}

	/// unset flags
	inline void unset_flag(Flags flag) {
		entity_flags &= ~flag;
	}

	/// add an entity menu
	void add_menu(MenuDescription *menu);

	/// remove an entity menu
	void remove_menu(std::string const &label);

	/// clear all update flags
	virtual void clear_updates();

	/**
	 * @brief mutable reference to the location
	 */
	inline math::Vector3f& get_location() {
		return entity_location;
	}

	/**
	 * @brief mutable reference to the axis
	 */
	inline math::Axis& get_axis() {
		return entity_axis;
	}

	/**
	 * @brief mutable reference to the primary color
	 */
	inline math::Color& get_color() {
		return entity_color;
	}

	/**
	 * @brief mutable reference to the secondary color
	 */

	inline math::Color& get_color_second() {
		return entity_color_second;
	}

	/* ---- deserializers -------------------------------------- */

	/// receive a client-to-server update from a stream
	virtual void receive_client_update(std::istream &is);

	/// receive a server-to-client create from a stream
	virtual void receive_server_create(std::istream &is);

	/// receive a server-to-client update from a stream
	virtual void receive_server_update(std::istream &is);

	/* ---- serializers ---------------------------------------- */

	/// serialize the entity to a stream
	virtual void serialize_server_create(std::ostream & os) const;

	/// serialize a client-to-server update on a stream
	virtual void serialize_client_update(std::ostream & os) const;

	/// serialize a server-to-client update on a stream
	virtual void serialize_server_update(std::ostream & os) const;


	/* ---- static --------------------------------------------- */

	/// type definition for the entity registry
	typedef std::map<unsigned int, Entity*> Registry;

	/// find an entity in the registry
	static Entity *find(unsigned int id);

	/// add an entity to the registry
	static void add(Entity *ent, unsigned int it);

	/// erase an entity from the registry and delete it
	static void erase(unsigned int entity_id);

	/// list the entity registry
	static void list();

	/// the entity registry
	static inline Registry & registry() {
		return entity_registry;
	}

	/* entity_ variables can be set by the module */

	/// speed of the entity
	float			entity_speed;
	Shape 			entity_shape;
	unsigned int		entity_moduletypeid;

	bool 			entity_created;
	bool			entity_destroyed;

	/// timestamp when entity data was received from the server
	float			entity_servertimestamp;

private:

	unsigned int		entity_id;
	unsigned int 		entity_flags;

	bool			entity_dirty;
	bool			entity_visible;
	bool			entity_serverside;

	math::Vector3f 		entity_location;
	math::Axis		entity_axis;

	float 			entity_radius;

	math::Color 		entity_color;
	math::Color 		entity_color_second;

	std::string		entity_name;
	std::string		entity_label;
	std::string		entity_modelname;

	model::Model*		entity_model;

	// the zone the entity belongs to
	Zone*			entity_zone;
	// the previous zone the entity belonged too
	Zone*			entity_oldzone;

	Menus			entity_menus;

	Extension*		entity_extension[4];

	static Registry 	entity_registry;
	static size_t		entity_nextid;

	static void add(Entity *ent);
};


/// an entity that can move around in the game world
class EntityDynamic : public Entity
{
public:
	/// create a dynamic entity
	EntityDynamic(const unsigned int flags = 0);

	/// create a dynamic entity from stream data
	EntityDynamic(std::istream & is);

	virtual ~EntityDynamic();

	/*----- inspectors ------------------------------------------------ */
	/// core type id
	virtual inline const unsigned int type() const {
		return Entity::Dynamic;
	}

	/// event state
	inline const int state() const {
		return entity_state;
	}

	/// event state timer
	inline const float timer() const {
		return entity_timer;
	}

	/*----- serializers ----------------------------------------------- */

	/// serialize the entity to a stream
	virtual void serialize_server_create(std::ostream & os) const;

	/// serialize a client-to-server update on a stream
	virtual void serialize_client_update(std::ostream & os) const ;

	/// serialize a server-to-client update on a stream
	virtual void serialize_server_update(std::ostream & os) const;

	/*----- mutators -------------------------------------------------- */

	/// receive a client-to-server update from a stream
	virtual void receive_client_update(std::istream &is);

	/// receive a server-to-client create from a stream
	virtual void receive_server_create(std::istream &is);

	/// receive a server-to-client update from a stream
	virtual void receive_server_update(std::istream &is);

	/// set event state
	virtual void set_state(int state);

	/// runs one game frame for the entity
	/**
	 * The default implementation will update the position() of the entity,
	 * determined by its speed() and axis()
	 */
	virtual void frame(float seconds);

protected:
	float			entity_timer;
	int			entity_state;

};

/// an entity that can be controlled by a player
class EntityControlable : public EntityDynamic
{
	friend class Player;
public:
	/// create a controlable entity
	EntityControlable(Player *owner, const unsigned int flags = 0);

	/// create a controlable entity from stream data
	EntityControlable(std::istream & is);

	virtual ~EntityControlable();

	/*----- inspectors ------------------------------------------------ */

	/// core type id
	virtual inline const unsigned int type() const {
		return Entity::Controlable;
	}

	/// owner of this entity
	inline Player *owner() const {
		return entity_owner;
	}

	/// thrust
	inline float thrust() const {
		return entity_thrust;
	}

	/// movement indicator
	inline float movement() const {
		return entity_movement;
	}

	/*----- serializers ----------------------------------------------- */

	/// serialize the entity to a stream
	virtual void serialize_server_create(std::ostream & os) const;

	/// serialize a client-to-server update on a stream
	virtual void serialize_client_update(std::ostream & os) const;

	/// serialize a server-to-client update on a stream
	virtual void serialize_server_update(std::ostream & os) const;

	/*----- mutators -------------------------------------------------- */

	/// receive a client-to-server update from a stream
	virtual void receive_client_update(std::istream &is);

	/// receive a server-to-client create from a stream
	virtual void receive_server_create(std::istream &is);

	/// receive a server-to-client update from a stream
	virtual void receive_server_update(std::istream &is);

	/// set the target thrust
	void set_thrust(float thrust);

	/// set the target direction
	void set_direction(float direction);

	/// set the target pitch
	void set_pitch(float pitch);

	/// set target roll
	void set_roll(float roll);

	/// set target strafe
	void set_strafe(float strage);

	/// set afterburner/reverse
	void set_afterburner(float afterburner);

	/// runs one game frame for the entity
	/**
	 * The default implementation will set direction() and thrust() to the desired targets
	 * and calls its parent frame() funcion.
	 */
	virtual void frame(float seconds);

	/// current thrust
	float			entity_thrust;

protected:
	/* target_ variables can be set by the client */
	/// target thrust as set by the client
	float			target_thrust;
	/// target direction as set by the client
	/** target_direction must be in the [-1, 1] range
	 */
	float			target_direction;
	/// target pitch as set by the client
	/** target_pitch must be in the [-1, 1] range
	 */
	float 			target_pitch;
	/// target roll as set by the client
	/** target_roll must be in the [-1, 1] range
	 */
	float 			target_roll;

	float 			target_afterburner;

	float			target_strafe;

	float 			entity_movement;

private:
	// owner of the entity
	Player			*entity_owner;
};

/// a Globe entity
class EntityGlobe : public Entity
{
public:
	EntityGlobe(const unsigned int flags = 0);
	EntityGlobe(std::istream & is);

	virtual ~EntityGlobe();

	/*----- inspectors ----------------------------------------------- */
	/// texture name
	inline const std::string &texture() const {
		return entity_texture;
	}

	/// rotation speed in degrees per second
	inline float rotationspeed() const {
		return entity_rotationspeed;
	}

	/*----- serializers ----------------------------------------------- */

	/// serialize the entity to a stream
	virtual void serialize_server_create(std::ostream & os) const;

	/// receive a server-to-client create from a stream
	virtual void receive_server_create(std::istream &is);

	/*----- inspectors ------------------------------------------------ */

	/// core type id
	virtual inline const unsigned int type() const {
		return Entity::Globe;
	}

	std::string		entity_texture;

	/// client side, texture id
	unsigned int		render_texture;

	/// rotation speed in degrees/second;
	float 			entity_rotationspeed;
};

}

#endif // __INCLUDED_CORE_ENTITY_H__