/*
   view.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 <GL/gl.h>

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>

#include "client/client.h"
#include "client/camera.h"
#include "client/chat.h"
#include "client/console.h"
#include "client/video.h"
#include "render/draw.h"
#include "render/render.h"
#include "core/core.h"
#include "math/mathlib.h"
#include "sys/sys.h"

namespace client
{

namespace view
{

float fps = 0;

void init()
{
	camera::init();
}

void shutdown()
{
	camera::shutdown();
}

void reset()
{
	using namespace render;

	// set clear color
	gl::clearcolor(0.0f, 0.0f, 0.0f, 1.0f);

	// shading model: Gouraud (smooth, the default)
	gl::shademodel(GL_SMOOTH);
	//gl::shademodel(GL_FLAT);

	// lighting
 	GLfloat light_position[] = { 0.0, 0.0, 0.0, 1.0 };
	GLfloat ambient_light[] = { 0.2f, 0.2f, 0.2f, 1.0f };
	GLfloat diffuse_light[] = { 0.4f, 0.4f, 0.4f, 1.0f };
	GLfloat specular_light[] = { 0.4f, 0.4f, 0.4f, 1.0f };
	GLfloat specular_reflectance[] = { 0.2f, 0.2f, 0.2f, 1.0f };

	glLightfv(GL_LIGHT0, GL_POSITION, light_position);
	glLightfv(GL_LIGHT0, GL_AMBIENT, ambient_light);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse_light);
	glLightfv(GL_LIGHT0, GL_SPECULAR, specular_light);

	// color tracking
	glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);	
	
	glMaterialfv(GL_FRONT, GL_SPECULAR, specular_reflectance);
	glMateriali(GL_FRONT, GL_SHININESS, 128); // shininess 1-128

	gl::disable(GL_LIGHTING);
	gl::enable(GL_LIGHT0);
	gl::disable(GL_COLOR_MATERIAL);
	
	// culling
	gl::cullface(GL_BACK);
	gl::frontface(GL_CCW);
	gl::disable(GL_CULL_FACE);

	// depth
	gl::depthmask(GL_TRUE);
	gl::disable(GL_DEPTH_TEST);	

	// alpha-blending
	gl::blendfunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	gl::enable(GL_BLEND);	

	// client state
}

void draw_loader()
{
	using namespace render;

	gl::enable(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, render::textures[0]); // bitmaps/loader.tga
	gl::color(1.0f, 1.0f, 1.0f, 1.0f);

	gl::begin(gl::Quads);

	glTexCoord2f(0.0f, 0.0f);
	gl::vertex(0,0, 0);

	glTexCoord2f(1.0f, 0.0f);
	gl::vertex(video::width,0,0);

	glTexCoord2f(1.0f, 1.0f);
	gl::vertex(video::width,video::height,0);

	glTexCoord2f(0.0f, 1.0f);
	gl::vertex(0,video::height,0);
	gl::end();

	gl::disable(GL_TEXTURE_2D);
}

void draw_status()
{
	using namespace render;

	if (console::visible())
		return;

	glBindTexture(GL_TEXTURE_2D, render::textures[1]); // bitmaps/conchars.tga
	gl::enable(GL_TEXTURE_2D);

	// print the status in the upper left corner
	gl::color(1.0f, 1.0f, 1.0f, 1.0f);
	std::stringstream status;

	int hours = (int) sys::time() / 3600;
	int minutes = (int)(sys::time() - 3600*hours) / 60;
	int seconds = (int)(sys::time() - 3600*hours - 60 *minutes);
	status << "clock " << std::setfill('0') << std::setw(2) << hours << ":"
	<< std::setfill('0') << std::setw(2) << minutes << ":"
	<< std::setfill('0') << std::setw(2) << seconds;

	minutes = (int) floorf(core::application()->time() / 60.0f);
	seconds = (int) floorf(core::application()->time() - (float) minutes* 60.0f);

	status << " time " << std::setfill('0') << std::setw(2) << minutes << ":" << std::setfill('0') << std::setw(2) << seconds;
	
	draw_text(CHARWIDTH, 4, status);

	// print stats if desired
	if (render::r_drawstats && render::r_drawstats->value()) {
		std::stringstream stats;
		stats << "fps   " << std::setw(6) << fps << "\n";
		stats << "tris  " << std::setw(6) << render::Stats::tris << "\n";
		stats << "spheres " << std::setw(4) << render::Stats::spheres << "\n";
		draw_text(video::width-CHARWIDTH*13, CHARHEIGHT*3, stats);
	}

	// print the version number in the upper right corner
	gl::color(0.0f, 1.0f, 0.0f, 1.0f);
	std::string version("ver. ");
	version.append(core::version());
	draw_text(video::width-(version.size()+1)*CHARWIDTH, 4, version);

	// draw notifications
	gl::color(1.0f, 1.0f, 1.0f, 1.0f);	
	size_t n = console::notify_pos  % MAXNOTIFYLINES;
	float now = sys::time();
	int h =  4 +  CHARHEIGHT;
	for (size_t l =  0; l < MAXNOTIFYLINES; l++) {
		if (console::notify_text[n].size() > 2 && console::notify_time[n] + 4 > now) {
			if (console::notify_text[n][0] == '?')
				gl::color(0.7f,0.7f,0.7f, 1.0f);
			else if (console::notify_text[n][0] == '*')
				gl::color(1.0f,1.0f,0.0f, 1.0f);
			else if (console::notify_text[n][0] == '!')
				gl::color(1.0f,0.0f,0.0f, 1.0f);
			else
				gl::color(1.0f,1.0f,1.0f, 1.0f);
			draw_text(CHARWIDTH, h, console::notify_text[n].substr(2));
			h += CHARHEIGHT;
		}
		n = (n+1) % MAXNOTIFYLINES;
	}

	// draw a basic HUD
	if (core::localcontrol()) {
		status.str("");
		status << " dir " <<  std::setfill('0') << std::setw(3) << roundf(core::localcontrol()->direction()) <<
				" speed " <<  std::setfill(' ') << std::setw(5) << std::fixed << std::setprecision(2) <<  core::localcontrol()->speed();
		draw_text(CHARWIDTH, video::height - CHARHEIGHT -4, status);
	}

	gl::disable(GL_TEXTURE_2D);
}

void frame(float seconds)
{
	using namespace render;
	
	// calculate frames per second
	if (seconds > 0.0f)
		fps = floorf(1.0f / seconds);
	else
		fps = 9999;

	// flush console messages
	console::flush();

	// Clear the color and depth buffers.
	gl::clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

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

		// Change to the projection matrix and set our viewing volume.
		gl::matrixmode(GL_PROJECTION);
		gl::loadidentity();

		// FIXME width must always be one
		const float frustumsize = 0.5f;
		gl::frustum(-frustumsize*video::aspect, frustumsize*video::aspect, -frustumsize, frustumsize, 1.0f, 1024.0f);

		gl::matrixmode(GL_MODELVIEW);	// map world to screen coordinates
		gl::loadidentity();
		
		camera::draw(seconds);		// draw the current camera transformation

		render::draw(camera::eye, camera::target, seconds);		// draw the world

	}

	// switch to ortographic projection to draw the GUI
	gl::matrixmode(GL_PROJECTION);
	gl::loadidentity();
	glOrtho(0, video::width, video::height, 0, -1000.0f, 1000.0f);

	gl::matrixmode(GL_MODELVIEW);
	gl::loadidentity();

	if (!core::application()->connected()) {
		// draw the loader bitmap
		draw_loader();
	}

	// draw the console
	console::draw();
	chat::draw();

	// draw the status line
	draw_status();
}

} //namespace view

} // namespace client