/************************************************************************
* Minetest-c55
* Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
*
* camera.h
* voxelands - 3d voxel world sandbox game
* Copyright (C) Lisa 'darkrose' Milne 2014 <lisa@ltmnet.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*
* License updated from GPLv2 or later to GPLv3 or later by Lisa Milne
* for Voxelands.
************************************************************************/

#ifndef CAMERA_HEADER
#define CAMERA_HEADER

#include "common_irrlicht.h"
#include "inventory.h"
#include "tile.h"
#include "utility.h"
#include <ICameraSceneNode.h>
#include <IMeshCache.h>
#include <IAnimatedMesh.h>

class LocalPlayer;
struct MapDrawControl;
class ExtrudedSpriteSceneNode;
class Client;

/*
	Client camera class, manages the player and camera scene nodes, the viewing distance
	and performs view bobbing etc. It also displays the wielded tool in front of the
	first-person camera.
*/
class Camera
{
public:
	Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control, Client *client);
	~Camera();

	// Get player scene node.
	// This node is positioned at the player's torso (without any view bobbing),
	// as given by Player::m_position. Yaw is applied but not pitch.
	inline scene::ISceneNode* getPlayerNode() const
	{
		return m_playernode;
	}

	// Get head scene node.
	// It has the eye transformation and pitch applied,
	// but no view bobbing.
	inline scene::ISceneNode* getHeadNode() const
	{
		return m_headnode;
	}

	// Get camera scene node.
	// It has the eye transformation, pitch and view bobbing applied.
	inline scene::ICameraSceneNode* getCameraNode() const
	{
		return m_cameranode;
	}

	// Get the camera position (in absolute scene coordinates).
	// This has view bobbing applied.
	inline v3f getPosition() const
	{
		return m_camera_position;
	}

	// Get the camera direction (in absolute camera coordinates).
	// This has view bobbing applied.
	inline v3f getDirection() const
	{
		return m_camera_direction;
	}

	// Get the camera offset
	inline v3s16 getOffset() const
	{
		return m_camera_offset;
	}

	// Horizontal field of view
	inline f32 getFovX() const
	{
		return m_fov_x;
	}

	// Vertical field of view
	inline f32 getFovY() const
	{
		return m_fov_y;
	}

	// Get maximum of getFovX() and getFovY()
	inline f32 getFovMax() const
	{
		return MYMAX(m_fov_x, m_fov_y);
	}

	// Checks if the constructor was able to create the scene nodes
	bool successfullyCreated(std::wstring& error_message);

	// Step the camera: updates the viewing range and view bobbing.
	void step(f32 dtime);

	// Update the camera from the local player's position.
	// frametime is used to adjust the viewing range.
	void update(LocalPlayer* player, f32 frametime, v2u32 screensize);

	// Render distance feedback loop
	void updateViewingRange(f32 frametime_in);

	// Replace the wielded item mesh
	void wield(const InventoryItem* item);

	// Start digging animation
	// Pass 0 for left click, 1 for right click
	void setDigging(s32 button);

	// Draw the wielded tool.
	// This has to happen *after* the main scene is drawn.
	// Warning: This clears the Z buffer.
	void drawWieldedTool();

private:
	Client *m_client;
	// Scene manager and nodes
	scene::ISceneNode* m_playernode;
	scene::ISceneNode* m_headnode;
	scene::ICameraSceneNode* m_cameranode;

	scene::ISceneManager* m_wieldmgr;
	ExtrudedSpriteSceneNode* m_wieldnode;
	v3f m_wieldnode_baserotation;
	v3f m_wieldnode_baseposition;

	// draw control
	MapDrawControl& m_draw_control;

	// Absolute camera position
	v3f m_camera_position;
	// Absolute camera direction
	v3f m_camera_direction;
	// Camera offset
	v3s16 m_camera_offset;

	// Field of view and aspect ratio stuff
	f32 m_fov;
	f32 m_aspect;
	f32 m_fov_x;
	f32 m_fov_y;

	// Stuff for viewing range calculations
	f32 m_wanted_frametime;
	f32 m_added_frametime;
	s16 m_added_frames;
	f32 m_range_old;
	f32 m_frametime_old;
	f32 m_frametime_counter;
	f32 m_time_per_range;

	bool m_view_bobbing;
	// View bobbing animation frame (0 <= m_view_bobbing_anim < 1)
	f32 m_view_bobbing_anim;
	// If 0, view bobbing is off (e.g. player is standing).
	// If 1, view bobbing is on (player is walking).
	// If 2, view bobbing is getting switched off.
	s32 m_view_bobbing_state;
	// Speed of view bobbing animation
	f32 m_view_bobbing_speed;
	f32 m_view_bobbing_amount;

	// Digging animation frame (0 <= m_digging_anim < 1)
	f32 m_digging_anim;
	// If -1, no digging animation
	// If 0, left-click digging animation
	// If 1, right-click digging animation
	s32 m_digging_button;
};

#endif
