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

#include "SDL/SDL.h"

#include "audio/audio.h"
#include "auxiliary/functions.h"
#include "client/client.h"
#include "client/input.h"
#include "client/joystick.h"
#include "client/keyboard.h"
#include "client/targets.h"
#include "client/video.h"
#include "core/core.h"
#include "math/functions.h"
#include "render/camera.h"
#include "render/state.h"
#include "render/draw.h"
#include "render/dust.h"
#include "render/text.h"
#include "render/screenshot.h"
#include "ui/ui.h"

namespace client
{

core::Cvar *input_mousecontrol = 0;
core::Cvar *input_keydelay = 0;
core::Cvar *input_keyrepeat = 0;
core::Cvar *input_mousedelay = 0;

namespace input
{

//--- local variables ---------------------------------------------

// keyboard instance
Keyboard *keyboard = 0;
// keyboard modifiers shift, ctrl, alt etc
int keyboard_modifiers = 0;
// last key pressed
Key *last_key = 0;
float last_key_time = 0;

// local controls
float local_direction = 0.0f;
float local_pitch = 0.0f;
float local_thrust = 0.0f;
float local_roll = 0.0f;
float local_strafe = 0.0f;
float local_afterburner = 0.0f;

// last controlled entity
unsigned int last_control = 0;

// mouse cursor position
int mouse_x = 0;
int mouse_y = 0;

float mouse_pitch = 0;
float mouse_direction = 0;


// true if the mouse has control
float mouse_control_override_time = 0;
bool mouse_control_override = false;
bool mouse_control = false;
// true if the mouse is in the deadzone
bool mouse_deadzone = false;

// time the mouse was last moved
float mouse_lastmoved = 0;

// true if we're using a joystick
bool joystick_control = false;
// time the joystick last moved

float joystick_lastmoved = 0;

const float thruster_offset = 0.05f;

int mouse_position_x() {
	return mouse_x;
}

int mouse_position_y() {
	return mouse_y;
}

Key *last_key_pressed() {
	return last_key;
}

float mouse_lastmoved_time()
{
	return mouse_lastmoved;
}

float joystick_lastmoved_time()
{
	return joystick_lastmoved;
}

//--- engine functions --------------------------------------------

void func_screenshot(std::string const & args)
{
	render::Screenshot::save();
}

void func_ui_control(std::string const &args)
{
	if (!core::localcontrol() || core::localplayer()->view())
		return;

	if (input_mousecontrol->value() > 0) {
			(*input_mousecontrol) = 0.0f;
	} else {
		(*input_mousecontrol) = 1.0f;
	}

	if (!input_mousecontrol->value()) {
		local_direction = 0.0f;
		local_pitch = 0.0f;
		local_roll = 0.0f;

		render::Camera::set_direction(0.0f);
		render::Camera::set_pitch(0.0f);
	}
	audio::play("ui/control");
}

void func_view_next(std::string const &args)
{
	if (!core::localplayer()->view() && core::application()->connected() && core::localcontrol()) {
		render::Camera::view_next();
		local_roll = 0;
		local_pitch = 0;
		local_direction = 0;
		audio::play("ui/view");
	}
}

void func_view_prev(std::string const &args)
{
	if (!core::localplayer()->view() && core::application()->connected() && core::localcontrol()) {
		render::Camera::view_previous();
		local_roll = 0;
		local_pitch = 0;
		local_direction = 0;
		audio::play("ui/view");
	}
}

void func_list_joystick(std::string const &args)
{
	Joystick::list();
}

void func_list_actions(std::string const &args)
{
	if (keyboard)
		keyboard->list_actions();
	else
		con_warn << "Keyboard handler not installed!" << std::endl;
}

void func_list_keys(std::string const &args)
{
	if (keyboard) {
		std::stringstream argstr(args);
		std::string keyname;
		if (argstr >> keyname) {
			aux::to_lowercase(keyname);
			keyboard->bind(keyname, "");
		} else {
			keyboard->list_keys();
		}
	} else {
		con_warn << "Keyboard handler not installed!" << std::endl;
	}
}

void func_list_binds(std::string const &args)
{
	if (keyboard) {
		std::stringstream argstr(args);
		std::string keyname;
		if (argstr >> keyname) {
			aux::to_lowercase(keyname);
			keyboard->bind(keyname, "");
		} else {
			keyboard->list_binds();	
		}
	} else {
		con_warn << "Keyboard handler not installed!" << std::endl;
	}
}

void func_bind(std::string const &args)
{
	if (keyboard) {
		std::stringstream argstr(args);
		std::string keyname;
		if (argstr >> keyname) {
			aux::to_lowercase(keyname);
			if (args.size() > keyname.size()+1) {		
				keyboard->bind(keyname, args.substr(keyname.size()+1));
			} else {
				keyboard->bind(keyname, "");
			}
			return;
		} else {
			core::Func *func = core::Func::find("bind");
			con_print << "Usage: bind " << func->info() << std::endl;
		}
	} else {
		con_warn << "Keyboard handler not installed!" << std::endl;
	}
}

void func_unbind(std::string const &args)
{
	if (keyboard) {

		std::stringstream argstr(args);
		std::string keyname;
		if (argstr >> keyname) {
			keyboard->unbind(keyname);
			return;
		}

		core::Func *func = core::Func::find("unbind");
		con_print << "unbind " << func->info() << std::endl;

	} else {
		con_warn << "Keyboard handler not installed!" << std::endl;
	}
}

//--- input functions ---------------------------------------------

void init()
{
	con_print << "^BInitializing input..." << std::endl;

	keyboard = new Keyboard();

 	SDL_ShowCursor(SDL_DISABLE);
	SDL_WM_GrabInput(SDL_GRAB_ON);
//	SDL_EnableUNICODE(1);

	Joystick::init();

	input_mousecontrol = core::Cvar::get("input_mousecontrol", 1.0f, core::Cvar::Archive);
	input_mousecontrol->set_info("[bool] enable or disable mouse control");

	input_keydelay = core::Cvar::get("input_keydelay", 200.0f, core::Cvar::Archive);
	input_keydelay->set_info("[int] keyboard delay time-out in milliseconds");

	input_keyrepeat = core::Cvar::get("input_keyrepeat", 35.0f, core::Cvar::Archive);
	input_keyrepeat->set_info("[int] keyboard repeat time-out in milliseconds");

	input_mousedelay = core::Cvar::get("input_mousedelay", 150.0f, core::Cvar::Archive);
	input_mousedelay->set_info("[int] mouse click time-out in milliseconds");
	core::Func *func = 0;

	func = core::Func::add("ui_control",func_ui_control);
	func->set_info("toggle mouse control");

	func = core::Func::add("list_joystick", func_list_joystick);
	func->set_info("list joysticks");

	func = core::Func::add("list_actions", func_list_actions);
	func->set_info("list key action names");

	func = core::Func::add("list_keys", func_list_keys);
	func->set_info("list key names");

	func = core::Func::add("list_binds",func_list_binds);
	func->set_info("list keyb binds");

	func = core::Func::add("bind", (core::FuncPtr) func_bind);
	func->set_info("[key] [str] bind a command to a key");

	func = core::Func::add("unbind", func_unbind);
	func->set_info("[key] unbind a key");

	func = core::Func::add("unbindall", func_unbind);
	func->set_info("unbind all keys");

	func = core::Func::add("view_next", func_view_next);
	func->set_info("switch to next view");

	func = core::Func::add("view_prev", func_view_prev);
	func->set_info("switch to previous view");

	func = core::Func::add("screenshot", func_screenshot);
	func->set_info("make a screenshot");

	keyboard->load_binds();
}

void shutdown()
{
	con_print << "^BShutting down input..." << std::endl;

	Joystick::shutdown();

	core::Func::remove("list_actions");
	core::Func::remove("list_keys");
	core::Func::remove("list_binds");

	core::Func::remove("bind");
	core::Func::remove("unbind");
	core::Func::remove("unbindall");

	core::Func::remove("screenshot");
	
	core::Func::remove("ui_control");
	core::Func::remove("ui_view");
	
	if (keyboard) {
		keyboard->save_binds();
		delete keyboard;
		keyboard = 0;
	}

 	SDL_ShowCursor(SDL_ENABLE);
	SDL_WM_GrabInput(SDL_GRAB_OFF);
//	SDL_DisableUNICODE(0);

}

void action_press(Key const *key, std::string const &action)
{
	/* -- thruster ------------------------------------ */
	if (action.compare("+thrustup") == 0) {
		local_thrust += thruster_offset;
		

	} else if (action.compare("+thrustdown") == 0) {
		local_thrust -= 2.0f * thruster_offset;
	
	/* -- mouse control ------------------------------- */
	} else if (action.compare("+control") == 0) {
		if (!mouse_control_override) {
			mouse_control_override = true;
			mouse_control_override_time = key->pressed();
		}

	/* -- directional control ------------------------- */
	} else if (action.compare("+left") == 0) {
		local_direction = 1.0f;

	} else if (action.compare("+right") == 0) {
		local_direction = -1.0f;

	} else if (action.compare("+up") == 0) {
		local_pitch = 1.0f;

	} else if (action.compare("+down") == 0) {
		local_pitch = -1.0f;

	} else if (action.compare("+rollleft") == 0) {
		local_roll = 1.0f;

	} else if (action.compare("+rollright") == 0) {
		local_roll = -1.0f;

	} else if (action.compare("+strafeleft") == 0) {
		local_strafe = 1.0f;

	} else if (action.compare("+straferight") == 0) {
		local_strafe = -1.0f;

	} else if (action.compare("+afterburner") == 0) {
		local_afterburner = 1.0f;

	} else if (action.compare("+reverse") == 0) {
		local_afterburner = -1.0f;

	/* -- camera control ------------------------------ */
	
	} else if (action.compare("+zoomin") == 0) {
		render::Camera::set_zoom(-0.1f);

	} else if (action.compare("+zoomout") == 0) {
		render::Camera::set_zoom(+0.1f);

	} else if (action.compare("+camleft") == 0) {
		render::Camera::set_direction( math::min(key->pressed() - core::application()->time(), 1.0f) );

	} else if (action.compare("+camright") == 0) {
		render::Camera::set_direction(-math::min(key->pressed() - core::application()->time(),1.0f));

	} else if (action.compare("+camup") == 0) {
		render::Camera::set_pitch(math::min(key->pressed() - core::application()->time(),1.0f));

	} else if (action.compare("+camdown") == 0) {
		render::Camera::set_pitch(-math::min(key->pressed() - core::application()->time(),1.0f));
	} else
		con_warn << "Unknown action " << action << std::endl;
}

void action_release(Key *key, std::string const &action)
{
	/* -- thruster ------------------------------------ */
	if (action.compare("+thrustup") == 0) {
		

	} else if (action.compare("+thrustdown") == 0) {
		

	/* -- mouse control ------------------------------- */
	} else if (action.compare("+control") == 0) {
		if (mouse_control_override) {
			mouse_control_override = false;
			mouse_control_override_time = 0;
	
			if (!input_mousecontrol->value() || (joystick_control && mouse_control && 
				(render::Camera::mode() == render::Camera::Track ||  render::Camera::mode() == render::Camera::Cockpit))) {
				local_direction = 0.0f;
				local_pitch = 0.0f;
				local_roll = 0.0f;
	
				render::Camera::set_direction(0.0f);
				render::Camera::set_pitch(0.0f);
			}
		}

	/* -- directional control ------------------------- */
	} else if (action.compare("+left") == 0) {
		local_direction = 0.0f;

	} else if (action.compare("+right") == 0) {
		local_direction = 0.0f;

	} else if (action.compare("+up") == 0) {
		local_pitch = 0.0f;

	} else if (action.compare("+down") == 0) {
		local_pitch = 0.0f;

	} else if (action.compare("+rollleft") == 0) {
		local_roll = 0.0f;

	} else if (action.compare("+rollright") == 0) {
		local_roll = 0.0f;

	} else if (action.compare("+strafeleft") == 0) {
		local_strafe = 0.0f;

	} else if (action.compare("+straferight") == 0) {
		local_strafe = 0.0f;

	} else if (action.compare("+afterburner") == 0) {
		local_afterburner = 0.0f;

	} else if (action.compare("+reverse") == 0) {
		local_afterburner = 0.0f;

	/* -- camera control ------------------------------ */
	} else if (action.compare("+camleft") == 0) {
		render::Camera::set_direction(0.0f);

	} else if (action.compare("+camright") == 0) {
		render::Camera::set_direction(0.0f);

	} else if (action.compare("+camup") == 0) {
		render::Camera::set_pitch(0.0f);

	} else if (action.compare("+camdown") == 0) {
		render::Camera::set_pitch(0.0f);
	}
}

Key::Modifier modifier() {
	if ((keyboard_modifiers & Key::Shift) > 0 )
		return Key::Shift;
	else if ((keyboard_modifiers & Key::Ctrl)  > 0 )
		return Key::Ctrl;
	else if ((keyboard_modifiers & Key::Alt)  > 0 )
		return Key::Alt;
	else
		return Key::None;
}

void key_pressed(Key *key)
{
	// FIXME implement a real 'console key'

	if (key->bind(Key::None).compare("ui_console") == 0) {
		// FIXME bah
		local_direction = 0.0f;
		local_pitch = 0.0f;
		local_roll = 0.0f;

		render::Camera::set_direction(0.0f);
		render::Camera::set_pitch(0.0f);

		ui::console()->toggle();
		return;
	}

	if (ui::root()->active()) {
		local_direction = 0.0f;
		local_pitch = 0.0f;
		local_roll = 0.0f;

		render::Camera::set_direction(0.0f);
		render::Camera::set_pitch(0.0f);
	}
	
	if (ui::root()->input_key(true, Keyboard::translate_keysym(key->sym(), keyboard_modifiers), keyboard_modifiers)) {
		return;

	} else if (!core::localplayer()->view() && core::application()->connected() && core::localcontrol()) {

		char c = key->bind(modifier()).c_str()[0];
		if (c == '@') {
			// target bind
			if (targets::current_id())
				core::cmd() << key->bind(modifier()) << " " << targets::current_id() <<"\n";
		} else if (c == '+') {
			// action bind
			action_press(key, key->bind(modifier()));
		} else {
			// normal bind
			core::cmd() << key->bind(modifier()) << "\n";
		}

	} else if (core::application()->connected()) {

		char c = key->bind(modifier()).c_str()[0];
		if (c && c != '+' && c != '@') {
			// normal bind
			core::cmd() << key->bind(modifier()) << "\n";
		}
	}
}

void key_released(Key *key)
{
	ui::root()->input_key(false, Keyboard::translate_keysym(key->sym(), keyboard_modifiers), keyboard_modifiers);

	if (core::application()->connected() && core::localcontrol()) {

		if ((key->sym() ==  512 + SDL_BUTTON_LEFT) && targets::hover() && (key->waspressed() <= (input_mousedelay->value()/1000.0f) ) ) {
			// hovering target selected
			targets::select_target(targets::hover());
		} 
		
		// the release event still must be processed as usual
		char c = 0;
		c = key->bind(Key::None).c_str()[0];
		if (c == '+') {
			// action bind
			action_release(key, key->bind(Key::None));
		}
		c = key->bind(Key::Shift).c_str()[0];
		if (c == '+') {
			// action bind
			action_release(key, key->bind(Key::Shift));
		}
		c = key->bind(Key::Ctrl).c_str()[0];
		if (c == '+') {
			// action bind
			action_release(key, key->bind(Key::Ctrl));
		}
		c = key->bind(Key::Alt).c_str()[0];
		if (c == '+') {
			// action bind
			action_release(key, key->bind(Key::Alt));
		}
	}
}

void axis_event(int axis, int value)
{
	// value is in range -32768 to 32767
	switch(axis) {
		case 0: // direction
			if (value >= 0) {
				local_direction = (float) value / 32767.0f;
			} else {
				local_direction = (float) value / 32768.0f;
			}

			local_direction	*= -1;
			break;

		case 1: // pitch
			if (value >= 0) {
				local_pitch = (float) value / 32767.0f;
			} else {
				local_pitch = (float) value / 32768.0f;
			}

			break;

		case 2: // roll
			if (value >= 0) {
				local_roll = (float) value / 32767.0f;
			} else {
				local_roll = (float) value / 32768.0f;
			}

			local_roll	*= -1;
			break;

		case 3: // throttle
			if (value >= 0) {
				local_thrust = (float) value / 32767.0f;
			} else {
				local_thrust = (float) value / 32768.0f;
			}

			local_thrust = -0.5f * local_thrust + 0.5f;
	}

}

void reset()
{
	local_direction = 0.0f;
	local_pitch = 0.0f;
	local_roll = 0.0f;
	local_strafe = 0.0f;
	local_afterburner = 0.0f;

	if (core::localcontrol()) {
		local_thrust = core::localcontrol()->thrust();
		last_control = core::localcontrol()->id();
	} else {
		local_thrust = 0;
		last_control = 0;
	}
	mouse_pitch = 0.0f;
	mouse_direction = 0.0f;
	mouse_x = render::State::width() / 2;
	mouse_y = render::State::height() / 2;
	render::Camera::reset();
	render::Dust::reset();
	mouse_control_override = false;
	mouse_control_override_time = 0;
	targets::reset();

	for (Keyboard::iterator it = keyboard->begin(); it != keyboard->end(); it++) {
		Key *key = (*it).second;
		if (key) {
			key->key_pressed = 0;
			key->key_lastpressed = 0;
			key->key_waspressed = 0;
		}
	}

	last_key = 0;
	mouse_lastmoved = 0;
	joystick_lastmoved = 0;
}

void frame()
{
	/* -- detect localcontrol() changes --------------- */
	if (core::localcontrol() && (last_control != core::localcontrol()->id())) {
		reset();
	}

	if (core::localcontrol() && (core::localcontrol()->eventstate() != core::Entity::Normal)) {
		local_thrust = core::localcontrol()->thrust();
	}

	/* -- detect joystick stat changes ---------------- */
	Joystick::frame();
	joystick_control = Joystick::is_enabled();

	/* -- poll SDL keyboard events -------------------- */
	SDL_Event event;
	Key *key = 0;
	bool pressed = false;

	if (last_key_time + 1.0f < client()->time()) {
		last_key = 0;
		last_key_time = 0;
	}

	memset(&event, 0, sizeof(SDL_Event));
	while (SDL_PollEvent(&event)) {
		pressed =  false;
		key = 0;

		switch (event.type) {
			case SDL_VIDEORESIZE:
				video::resize(event.resize.w, event.resize.h);
				break;

  			case SDL_MOUSEMOTION:
				mouse_x = event.motion.x;
				mouse_y = event.motion.y;
				mouse_lastmoved = client()->time();
				ui::root()->input_mouse((float) mouse_x, (float) mouse_y);
				break;

			case SDL_MOUSEBUTTONDOWN:
				key = keyboard->press(512 + event.button.button);
				pressed = true;
				break;

			case SDL_MOUSEBUTTONUP:
				key = keyboard->release(512 + event.button.button);
				pressed = false;
				break;

			case SDL_JOYBUTTONDOWN:
				key = keyboard->press(564 + event.jbutton.button);
				pressed = true;
				break;

			case SDL_JOYBUTTONUP:
				key = keyboard->release(564 + event.jbutton.button);
				pressed = false;
				break;

			case SDL_JOYAXISMOTION:
				axis_event((int) event.jaxis.axis, (int) event.jaxis.value);
				joystick_lastmoved = client()->time();
				break;

			case SDL_KEYDOWN:
				keyboard_modifiers = event.key.keysym.mod;
				key = keyboard->press(event.key.keysym.sym);
				pressed = true;
				break;

			case SDL_KEYUP:
				keyboard_modifiers = event.key.keysym.mod;
				key = keyboard->release(event.key.keysym.sym);
				pressed = false;
				break;

			case SDL_QUIT:
				core::application()->shutdown();
				return;
				break;
		}	
		
		if (key) {
			if (pressed) {
				key_pressed(key);
				last_key = key;	// remember the last key that was pressed
				last_key_time = client()->time();
			} else {
				key_released(key);
			}
		}
	}

	/* -- handle key repeat --------------------------- */
	float delay = 200.0f;	// key delay time-out in milliseconds
	if (input_keydelay) {
		delay = input_keydelay->value();
		math::clamp(delay, 50.0f, 500.0f);
	}
	
	float repeat = 35.0f;	// key repeat time-out in milliseconds
	if (input_keyrepeat) {
		repeat = input_keyrepeat->value();
		math::clamp(repeat, 10.0f, 250.0f);
	}

	if (input_keydelay)
		(*input_keydelay) = delay;
	if (input_keyrepeat)
		(*input_keyrepeat) = repeat;
	
	repeat /= 1000.0f;
	delay /= 1000.0f;
	
	for (Keyboard::iterator it = keyboard->begin(); it != keyboard->end(); it++) {
		key = (*it).second;
		if (key &&  (key->sym() < 512) && key->pressed()) {
			if ((key->pressed()+delay < core::application()->time()) && (key->lastpressed()+repeat < core::application()->time())) {
				key->key_lastpressed = core::application()->time();
				key_pressed(key);
			}
		}
	}

	/* -- process mouse movement ----------------------*/
	mouse_control = false;
	mouse_deadzone = false;

	if (core::application()->connected() && core::localcontrol()) {
		mouse_control = ui::console()->hidden() && !ui::root()->active() && ((input_mousecontrol->value() > 0) || (mouse_control_override && (mouse_control_override_time + (input_mousedelay->value() / 1000.0f) < core::application()->time())));
		
		if (mouse_control && joystick_control && ((render::Camera::mode() == render::Camera::Track) || (render::Camera::mode() == render::Camera::Cockpit))) {
			if (!(mouse_control_override && (mouse_control_override_time + (input_mousedelay->value() / 1000.0f) < core::application()->time()))) {
				mouse_control = false;
			}
		}

		if (mouse_control) {
			// the mouse will not react if it is in the deadzone
			int deadzone_size = 8;
			mouse_deadzone = true;

			// direction
			int l = mouse_x - (render::State::width() >> 1);
	
			if (abs(l) < ( deadzone_size >> 1 )) {
				// dead zone
				mouse_direction = 0;
			} else {
				l = (mouse_x - deadzone_size) - ((render::State::width() - deadzone_size) >> 1);
				mouse_direction = float (-l) / (float) ((render::State::width() - deadzone_size) >> 1);
				mouse_deadzone = false;
			}

			// pitch
			int h = mouse_y - (render::State::height() >> 1);

			if (abs(h) < ( deadzone_size >> 1 )) {
				// dead zone
				mouse_pitch = 0;
			} else {
				h = (mouse_y - deadzone_size) - ((render::State::height() - deadzone_size) >> 1);
				mouse_pitch = float (-h) / (float) ((render::State::height() - deadzone_size) >> 1);
				mouse_deadzone = false;
			}

			if ((render::Camera::mode() == render::Camera::Track) || (render::Camera::mode() == render::Camera::Cockpit)) {
				
				//local_direction = mouse_direction * math::absf(mouse_direction);
				//local_pitch = mouse_pitch * math::absf(mouse_pitch);
				local_direction = mouse_direction;
				local_pitch = mouse_pitch;

			} else if (render::Camera::mode() == render::Camera::Free) {
				// squared values to smoothen camera movement
				render::Camera::set_direction( -mouse_direction * math::absf(mouse_direction));
				render::Camera::set_pitch(-mouse_pitch * math::absf(mouse_pitch));
			}
			
		}

		math::clamp(local_direction, -1.0f,  1.0f);
		math::clamp(local_pitch, -1.0f,  1.0f);
		math::clamp(local_roll, -1.0f,  1.0f);
		math::clamp(local_thrust, 0.0f,  1.0f);

		if (local_thrust < 0.01f)
			local_thrust = 0.0f;
		else if (local_thrust > 0.99f)
			local_thrust = 1.0f;

		core::localcontrol()->set_thrust(local_thrust);
		core::localcontrol()->set_direction(local_direction);
		core::localcontrol()->set_pitch(local_pitch / render::State::aspect() );
		core::localcontrol()->set_roll(local_roll);
		core::localcontrol()->set_strafe(local_strafe);
		core::localcontrol()->set_afterburner(local_afterburner);
	}
}

} // namespace input

} // namespace client