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/*
   client/console.cc
   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 <iostream>
#include <fstream>
#include <cmath>

#include "auxiliary/functions.h"
#include "audio/audio.h"
#include "client/chat.h"
#include "client/console.h"
#include "client/video.h"
#include "client/keyboard.h"
#include "core/core.h"
#include "filesystem/filesystem.h"
#include "render/render.h"
#include "render/textures.h"

namespace client {

Console client_console;

Console *console() {
	return &client_console;
}

//--- public ------------------------------------------------------

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

	console()->load_history();
}

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

	console()->save_history();
}

//--- Console -----------------------------------------------------

Console::Console()
{
	clear();
}

Console::~Console()
{
	history.clear();
}

void Console::clear()
{
	console_visible = false;
	console_scroll = 0;	
	history.clear();
	history.push_back("");
	history_pos = history.rbegin();
	input_pos = 0;

	clear_notify();

}

void Console::draw() {
	flush();
	if (visible())
		draw_console();
	else
		draw_notify();
}

void Console::toggle()
{
	console_visible = !console_visible;
	
	if (console_visible) {
		console_scroll = 0;
		input_pos = 0;

		history_pos = history.rbegin();
		(*history_pos).clear();

		SDL_WM_GrabInput(SDL_GRAB_OFF);
		SDL_ShowCursor(SDL_ENABLE);
	} else {
		SDL_WM_GrabInput(SDL_GRAB_ON);
		SDL_ShowCursor(SDL_DISABLE);
	}

	setkeyboardmode(console()->visible() || (core::application()->connected() && chat::visible()));

	audio::play("ui/console");
}

void Console::keypressed(unsigned int key)
{
	std::deque<std::string>::reverse_iterator upit;

	switch( key ) {
	case SDLK_TAB:
		core::CommandBuffer::complete( (*history_pos), input_pos);
		break;
	case SDLK_RETURN:
		if ((*history_pos).size()) {
			// store input into history
			while (history.size() >= MAXHISTOLINES) {
				history.pop_front();
			}

			core::cmd() << (*history_pos) << std::endl;
			con_print << "^B>" << (*history_pos) << std::endl;
			(*history.rbegin()) = (*history_pos);

			history.push_back("");
			history_pos = history.rbegin();
			input_pos = 0;
		}
		break;
	case SDLK_UP:
		upit = history_pos;
		++upit;
		if (upit != history.rend()) {
			history_pos = upit;
			input_pos = (*history_pos).size();
		}
		break;
	case SDLK_DOWN:
		if (history_pos != history.rbegin()) {
			--history_pos;
			input_pos = (*history_pos).size();
		}
		break;
	case SDLK_HOME:
		input_pos = 0;
		break;
	case SDLK_END:		
		input_pos = (*history_pos).size();
		break;
	case SDLK_LEFT:
		if (input_pos > 0)
			input_pos--;
		break;
	case SDLK_RIGHT:
		if (input_pos < (*history_pos).size())
			input_pos++;
		break;
	case SDLK_DELETE:
		if ((*history_pos).size() && input_pos < (*history_pos).size()) {
			(*history_pos).erase(input_pos, 1);
		}
		break;
	case SDLK_BACKSPACE:
		if ((*history_pos).size() && input_pos) {
			(*history_pos).erase(input_pos-1, 1);
			input_pos--;
		}
		break;
	case SDLK_PAGEUP:
		console_scroll +=5;
		if (console_scroll > consoleinterface_text.size()) console_scroll = consoleinterface_text.size();
		break;
	case SDLK_PAGEDOWN:
		if (console_scroll > 5)	console_scroll -=5;
		else console_scroll = 0;
		break;
	default:
		if ((key >= 32 ) && (key <175) && ((*history_pos).size() < MAXCMDSIZE)) {
			if (input_pos == (*history_pos).size())
				(*history_pos) += (char)key;
			else
				(*history_pos).insert(input_pos, 1, (char)key);
			input_pos++;
		}
		break;
	}

	
}

void Console::save_history()
{

	if (history.size() <= 1)
		return;

	std::string filename(filesystem::writedir());
	filename.append("history.txt");
	std::ofstream ofs(filename.c_str());

	if (!ofs.is_open()) {
		con_warn << "Could not write " << filename << std::endl;
		return;
	}
	std::deque<std::string>::iterator it;
	size_t l = 1;
	for (it = history.begin(); it != history.end(); it++) {
		if (l < history.size())
			ofs << (*it) << std::endl;
		l++;
	}

	ofs.close();
}

void Console::load_history()
{
	std::string filename(filesystem::writedir());
	filename.append("history.txt");
	std::ifstream ifs(filename.c_str(), std::ifstream::in);

	if (!ifs.is_open()) {
		con_warn << "Could not read " << filename << std::endl;
		return;
	}

	history.clear();
	char line[MAXCMDSIZE];
	while (ifs.getline(line, MAXCMDSIZE-1)) {
		history.push_back(line);
	}

	ifs.close();

	history.push_back("");
	history_pos = history.rbegin();
	input_pos = 0;
}

void Console::draw_notify()
{
	using namespace render;

	// draw notifications
	size_t width = (size_t) ((video::width-8) / Text::fontwidth());
	size_t n = notify_pos  % MAXNOTIFYLINES;
	float h =  video::height/2;
	for (size_t l =  0; l < MAXNOTIFYLINES; l++) {
		if (notify_text[n].size() > 2 && notify_time[n] + 5 > core::application()->time()) {
			std::string linedata(notify_text[n]);
			linedata += '\n';

			std::string word;
			size_t word_length = 0;

			std::string line;
			size_t line_length = 0;

			const char *c = linedata.c_str();
			char pen = 'N';
			char wordpen = 'N';
			Text::setcolor('N');

			while (*c) {

				// color code
				if (aux::is_color_code(c)) {
					c++;
					pen = *c;
					word += '^';
					word += pen;
				}

				// new word, wrap if necessary
				else if ((*c == '\n' ) || ( *c == ' ')) {
					
					if (line_length + word_length > width) {
						if (line.size()) {
							Text::draw(4, h, line);
							h += Text::fontheight();
							line.clear();
							line += '^';
							line += wordpen;
							line_length = 0;
						}
					}
					
					line.append(word);
					line_length += word_length;

					word.clear();
					word_length = 0;
					wordpen = pen;
									
					// new line
					if (*c == '\n' ) {
						Text::draw(4, h, line);
						h += Text::fontheight();
						line.clear();
						line_length = 0;
					// new word
					} else if (*c == ' ' ) {
						line += ' ';
						line_length++;
					}
				}

				// new character
				else {	
					word += *c;
					word_length++;
					
					if (word_length == width) {
						if (line.size()) {
							Text::draw(4, h, line);
							h += Text::fontheight();
							line.clear();
							line += '^';
							line += wordpen;
							line_length = 0;
						}

						line.append(word);
						line_length = word_length;

						word.clear();
						word_length = 0;
						wordpen = pen;
					}
				}

				c++;
			}
			
		}
		n = (n+1) % MAXNOTIFYLINES;
	}
}

void Console::draw_console()
{
	using namespace render;

	float con_height = 0.70f;
	
	gl::disable(GL_TEXTURE_2D);

	// draw the transparent console background
	gl::color(0.0f, 0.0f, 0.0f, 0.5f);
	gl::begin(gl::Quads);
	gl::vertex(0.0f, 0.0f, 0.0f);
	gl::vertex(video::width, 0.0f,0.0f);
	gl::vertex(video::width,video::height*con_height,0.0f);
	gl::vertex(0,video::height*con_height,0.0f);
	gl::end();

	gl::enable(GL_TEXTURE_2D);

	// draw version below the bottom of the console
	std::string version(core::name());
	version += ' ';
	version.append(core::version());
	gl::color(0.0f, 1.0f, 0.0f, 0.5f);
	Text::draw(video::width-Text::fontwidth()*(version.size()+1), video::height*con_height-Text::fontheight()-4, version);

	// draw the console consoleinterface_text
	if (console_scroll > consoleinterface_text.size())
		console_scroll = consoleinterface_text.size();
	
	size_t height = (size_t) (video::height * con_height / Text::fontheight()) -1;
	size_t width = (size_t) ((video::width-8) / Text::fontwidth());
	size_t bottom = consoleinterface_text.size() - console_scroll;
	size_t current_line = 0;

	std::deque<std::string>	lines;
	for (std::deque<std::string>::iterator it = consoleinterface_text.begin(); it != consoleinterface_text.end() && current_line < bottom; it++) {
		if (current_line >= bottom - height) {
			std::string linedata(*it);
			linedata += '\n';

			std::string word;
			size_t word_length = 0;

			std::string line;
			size_t line_length = 0;

			const char *c = linedata.c_str();
			char pen = 'N';
			char wordpen = 'N';

			while (*c) {

				// color code
				if (aux::is_color_code(c)) {
					c++;
					pen = *c;
					word += '^';
					word += pen;
				}

				// new word, wrap if necessary
				else if ((*c == '\n' ) || ( *c == ' ')) {
					
					if (line_length + word_length > width) {
						if (line.size()) {
							lines.push_back(line);
							line.clear();
							line += '^';
							line += wordpen;
							line_length = 0;
						}
					}
					
					line.append(word);
					line_length += word_length;

					word.clear();
					word_length = 0;
					wordpen = pen;
									
					// new line
					if (*c == '\n' ) {
						lines.push_back(line);
						line.clear();
						line_length = 0;
					// new word
					} else if (*c == ' ' ) {
						line += ' ';
						line_length++;
					}
				}

				// new character
				else {	
					word += *c;
					word_length++;
					
					if (word_length == width) {
						if (line.size()) {
							lines.push_back(line);
							line.clear();
							line += '^';
							line += wordpen;
							line_length = 0;
						}

						line.append(word);
						line_length = word_length;

						word.clear();
						word_length = 0;
						wordpen = pen;
					}
				}

				c++;
			}
			
		}
		current_line++;		
	}

	float y = video::height*con_height-2*Text::fontheight()-4;
	Text::setcolor('N');
	for (std::deque<std::string>::reverse_iterator rit = lines.rbegin(); (y >= 4) && (rit != lines.rend()); ++rit) {
		Text::draw(4, y, (*rit));
		y -= Text::fontheight();
	}
	

	// draw the console input
	y = video::height*con_height - Text::fontheight() - 4;
	Text::draw(4, y, "^B>");

	std::string firstpart((*history_pos).substr(0, input_pos));
	size_t draw_width = 0;
	const char *c = firstpart.c_str();

	while (*c) {
		if (aux::is_color_code(c)) {
			c++;
		} else {
			draw_width++;
		}
		c++;
	}

	c = firstpart.c_str();
	while (*c && draw_width > width - 2) {
		if (aux::is_color_code(c)) {
			c++;
			Text::setcolor(*c);
		} else {
			draw_width--;
		}
		c++;
	}

	if (*c) {
		Text::draw(4+Text::fontwidth(), y, c);
	}

	if (input_pos < (*history_pos).size()) {
		// FIXME limit to width
		if (input_pos > 1 && aux::is_color_code((*history_pos).c_str() + input_pos -1)) {
			Text::setcolor((*history_pos)[input_pos]);
		}
		c = (*history_pos).c_str() + input_pos;
		Text::draw(4+Text::fontwidth()*(draw_width+1), y, c);
	}

	// draw cursor
	if ((core::application()->time() - ::floorf(core::application()->time())) < 0.5f) {
		std::string cursor("^B");
		cursor += (char) 11;
		Text::draw(4+Text::fontwidth()*(draw_width+1), y , cursor);
	}

}


void Console::clear_notify()
{
	for (size_t i=0; i < MAXNOTIFYLINES; i++) {
		notify_text[i].clear();
		notify_time[i] = 0;
	}
	notify_pos = 0;
}

void Console::notify(std::string const & message)
{
	// save notification
	notify_text[notify_pos] = message;
	notify_time[notify_pos] = core::application()->time();
	notify_pos = (notify_pos+1) % MAXNOTIFYLINES;
}

} // namespace client