/*
Copyright (c) 2013 Daniele Bartolini, Michele Rossi
Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/

#pragma once

#include "Types.h"
#include "Config.h"
#include "OS.h"
#include "LinearAllocator.h"
#include "Resource.h"
#include "WorldTypes.h"

namespace crown
{

class Accelerometer;
class Bundle;
class BundleCompiler;
class ConsoleServer;
class Filesystem;
class Keyboard;
class LuaEnvironment;
class Mouse;
class OsWindow;
class Renderer;
class ResourceManager;
class ResourcePackage;
class Touch;
class World;
class WorldManager;
struct Camera;

/// This is the place where to look for accessing all of
/// the engine subsystems and related stuff.
class CE_EXPORT Device
{
public:

							Device();
							~Device();

	void					init();

	/// Shutdowns the engine freeing all the allocated resources
	void					shutdown();

	/// Returns the number of command line arguments passed to
	/// the engine executable.
	int32_t					argc() const { return m_argc; }

	/// Returns the string value of the command line arguments passed
	/// to the engine executable.
	/// The size of the returned array is given by Device::argc().
	const char**			argv() const { return (const char**) m_argv; }

	/// Returns wheter the engine is running (i.e. it is actually
	/// doing work).
	bool					is_running() const;

	/// Returns whether the engine is correctly initialized
	bool					is_init() const;

	/// Returns wheter the engine is paused
	bool 					is_paused() const;

	/// Return the number of frames rendered from the first
	/// call to Device::start()
	uint64_t				frame_count() const;

	/// Returns the time in seconds needed to render the last frame
	float					last_delta_time() const;

	/// Returns the time in seconds since the first call to start().
	double					time_since_start() const;

	/// Forces the engine to actually start doing work.
	void					start();

	/// Forces the engine to stop all the work it is doing
	/// and normally terminates the program.
	void					stop();

	/// Pauses the engine
	void					pause();

	/// Unpauses the engine
	void					unpause();

	virtual int32_t			run(int argc, char** argv) = 0;

	/// Updates all the subsystems
	void					frame();

	/// Updates the given @a world and renders it from the given @a camera.
	void					update_world(World* world, float dt);

	/// Renders the given @a world from the point of view of the given @æ camera.
	void					render_world(World* world, Camera* camera);

	WorldId					create_world();
	void					destroy_world(WorldId world);

	/// Returns the resource package with the given @a package_name name.
	ResourcePackage*		create_resource_package(const char* name);

	/// Destroy a previously created resource @a package.
	/// @note
	/// To unload the resources loaded by the package, you have to call
	/// ResourcePackage::unload() first.
	void					destroy_resource_package(ResourcePackage* package);

	void					compile(const char* bundle_dir, const char* source_dir, const char* resource);

	void					reload(const char* type, const char* name);

	Filesystem*				filesystem();
	ResourceManager*		resource_manager();
	LuaEnvironment*			lua_environment();

	OsWindow*				window();
	Renderer*				renderer();

	Keyboard*				keyboard();
	Mouse*					mouse();
	Touch*					touch();
	Accelerometer*			accelerometer();
	ConsoleServer*			console() { return m_console; }
	WorldManager*			world_manager() { return m_world_manager; }

protected:

	// Used to allocate all subsystems
	LinearAllocator			m_allocator;

	int32_t					m_argc;
	char**					m_argv;

	// Preferred settings
	char					m_source_dir[MAX_PATH_LENGTH];
	char 					m_bundle_dir[MAX_PATH_LENGTH];
	char 					m_boot_file[MAX_PATH_LENGTH];
	int32_t					m_fileserver;
	uint16_t				m_console_port;

	bool					m_is_init		: 1;
	bool					m_is_running	: 1;
	bool					m_is_paused		: 1;

	uint64_t				m_frame_count;

	uint64_t				m_last_time;
	uint64_t				m_current_time;
	float					m_last_delta_time;
	double					m_time_since_start;

	// Public subsystems
	Filesystem*				m_filesystem;

	OsWindow*				m_window;

	Keyboard*				m_keyboard;
	Mouse*					m_mouse;
	Touch*					m_touch;

	LuaEnvironment*			m_lua_environment;
	Renderer*				m_renderer;

	// Private subsystems
	BundleCompiler*			m_bundle_compiler;
	ConsoleServer*			m_console;
	ResourceManager*		m_resource_manager;
	Bundle*					m_resource_bundle;
	WorldManager*			m_world_manager;

	// Configuration resources
	ResourceId				m_physics_config;

private:

	// Disable copying
	Device(const Device&);
	Device& operator=(const Device&);
};

CE_EXPORT Device* device();

CE_EXPORT void set_device(Device* device);

} // namespace crown