/*
   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 "core/application.h"
#include "core/core.h"
#include "core/gameinterface.h"
#include "filesystem/filesystem.h"
#include "render/gl.h"
#include "ui/console.h"
#include "ui/paint.h"

namespace ui {

const float DEFAULT_CONSOLE_HEIGHT = 0.7f;
const size_t DEFAULT_MAX_HISTO_LINES = 512;

// the global console buffer object
ConsoleBuffer Console::con_buffer;

/* -- ConsoleBuffer ------------------------------------------------ */
ConsoleBuffer::ConsoleBuffer() : sys::ConsoleInterface()
{
	//con_print << "^BInitializing console..." << std::endl;	

}

ConsoleBuffer::~ConsoleBuffer()
{
	//con_print << "^BShutting down console..." << std::endl;
}

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

Console::Console(ui::Widget *parent) : ui::Window(parent)
{
	set_visible(false);
	set_border(false);
	set_background(true);
	set_label("console");

	history.clear();
	history.push_back("");
	history_pos = history.rbegin();

	console_scrollpane = new ui::ScrollPane(this, con_buffer.log());
	console_scrollpane->set_border(false);
	console_scrollpane->set_scroll(0);

	console_input = new ui::InputBox(this);
	console_input->set_focus();
	console_input->set_border(false);
	console_input->set_background(false);
	console_input->set_prompt("^N>");

	load_history();
}

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

void Console::show()
{
	ui::Window::show();
	SDL_WM_GrabInput(SDL_GRAB_OFF);
	SDL_ShowCursor(SDL_ENABLE);

	console_scrollpane->set_scroll(0);

	history_pos = history.rbegin();
	(*history_pos).clear();
	console_input->set_text((*history_pos));

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

void Console::hide()
{
	ui::Window::hide();
	SDL_WM_GrabInput(SDL_GRAB_ON);
	SDL_ShowCursor(SDL_DISABLE);

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

void Console::toggle()
{
	if (visible())
		hide();
	else
		show();
}

bool Console::on_keypress(const int key, const unsigned int modifier)
{
	// number of lines to scroll
	const size_t scroll_offset = 3;

	ui::Text::reverse_iterator upit;

	switch( key ) {
	
	case SDLK_ESCAPE:
		if (visible()) {
			hide();
			return true;
		} else {
			return false;
		}
		break;
/*
	case SDLK_TAB:
		core::CommandBuffer::complete( (*history_pos), input_pos);
		return true;
		break;
*/
	case SDLK_RETURN:
		if (console_input->text().size()) {
			// store input in history
			while (history.size() >= DEFAULT_MAX_HISTO_LINES) {
				history.pop_front();
			}
			core::cmd() << console_input->text() << std::endl;
			con_print << "^B>" << console_input->text() << std::endl;
			(*history.rbegin()).assign(console_input->text());
			history.push_back("");
			history_pos = history.rbegin();
			console_input->set_text((*history_pos));
		}
		return true;
		break;

	case SDLK_UP:
		upit = history_pos;
		++upit;
		if (upit != history.rend()) {
			history_pos = upit;
			console_input->set_text((*history_pos));
		}
		return true;
		break;
	case SDLK_DOWN:
		if (history_pos != history.rbegin()) {
			--history_pos;
			console_input->set_text((*history_pos));
		}
		return true;
		break;
	case 512 + SDL_BUTTON_WHEELUP:
	case SDLK_PAGEUP:
		console_scrollpane->inc_scroll(scroll_offset);
		return true;
		break;
	case 512 + SDL_BUTTON_WHEELDOWN:
	case SDLK_PAGEDOWN:
		console_scrollpane->dec_scroll(scroll_offset);
		return true;
		break;
	}

	return false;
}

void Console::draw()
{
	if (core::application()->connected()) {
		set_size(parent()->size().width(), parent()->size().height() * DEFAULT_CONSOLE_HEIGHT);
	} else {
		set_size(parent()->size());
	}

	math::Vector2f s(size());
	s[0] -= 8;
	s[1] -= 8;

	console_scrollpane->set_location(4, 4);
	console_scrollpane->set_size(s.width(), s.height() - font()->height());
	
	console_input->set_location(4, height() - font()->height() -4);
	console_input->set_size(s.width(), font()->height());

	math::Color fancy(palette()->fancy());
	fancy.a = 0.5f;
	paint::color(fancy);
	std::string version(core::name() + ' ' + core::version());
	s.assign(version.size() * font()->width(), font()->height());
	math::Vector2f l(global_location());
	l[0] += width() - s.width() -4;
	l[1] += height() - s.height() -4;
	paint::text(l, s, font(), version);
}

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;
	}
	ui::Text::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();
}

}