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

#include "client/mapwidget.h"
#include "client/targets.h"
#include "core/application.h"
#include "core/entity.h"
#include "core/entityglobe.h"
#include "ui/paint.h"
#include "render/render.h"
#include "render/gl.h"
#include "client/targets.h"
#include "ui/ui.h"

namespace client {

MapWidget::MapWidget(ui::Widget *parent) : ui::Widget(parent)
{
	set_label("mapwidget");
	mapwidget_zone = 0;
	mapwidget_target = 0;
	mapwidget_hover_id = 0;
	mapwidget_zoom = 1.0f;
}

MapWidget::~MapWidget()
{
	
}

void MapWidget::set_zoom(const float zoom)
{
	mapwidget_zoom = zoom;
}
void MapWidget::set_target(const core::Entity *entity)
{
	mapwidget_target = entity;	
}

void MapWidget::set_zone(core::Zone *zone)
{
	mapwidget_zone = zone;
}

bool MapWidget::on_mousepress(const unsigned int button)
{
	if (button == SDL_BUTTON_LEFT)
	{
		if (mapwidget_zone && hover())
		{
			core::Entity *target = mapwidget_zone->find_entity(hover());
			
			if (targets::is_valid_map_target(target))
			{
				set_target(target);
				emit(ui::Widget::EventClicked);
			}
		}
		return true;
	}

	return false;

}

bool MapWidget::on_mouserelease(const unsigned int button)
{
	if (button == SDL_BUTTON_LEFT)
	{
		return true;
	}
	
	return false;
}

void MapWidget::draw()
{
	if (!mapwidget_zone)
		return;
	
	// size and global location of the map
	const float map_size = math::min(width(), height());
	math::Vector2f map_location(global_location());
	
	if (map_size < width())
	{
		map_location[0] += (width() - map_size) * 0.5f;
	}
	if (map_size < height())
	{
		map_location[1] += (height() - map_size) * 0.5f;
	}

	// draw background
	math::Vector2f background_size(map_size, map_size);
	ui::Paint::draw_material(map_location, background_size, "ui/background");
	
	// number of squares in one grid segment
	const float grid_size = 16.0f;
	
	// draw the grid itself
	gl::color(0, 0, 0.8f);
	gl::begin(gl::Lines);
	
	for (float i = 0; i <= grid_size; i += 1.0f) {
		gl::vertex(map_location.x(), map_location.y() + map_size / grid_size * i);
		gl::vertex(map_location.x() + map_size, map_location.y() + map_size / grid_size * i);

		gl::vertex(map_location.x() + map_size / grid_size * i, map_location.y());
		gl::vertex(map_location.x() + map_size / grid_size * i, map_location.y() + map_size);
	}
	gl::end();

	// request required textures
	const size_t texture_entity = render::Textures::load("bitmaps/icons/entity_default");
	const size_t texture_globe = render::Textures::load("bitmaps/icons/entity_globe");
	const size_t texture_bright = render::Textures::load("bitmaps/icons/entity_bright");
	
	size_t texture_current = render::Textures::bind(texture_entity);

	// global mouse cursor location
	const math::Vector2f cursor(ui::root()->global_mouse_coords());
	mapwidget_hover_id = 0;
	
	// map center
	math::Vector2f map_center(map_location[0] + map_size / 2.0f,  map_location[1] + map_size / 2.0f);
	math::Vector2f icon_location;
	const float r = 12.0f; 		// radius of map icons	
	float scale = 4096.0f; 		// map size in game units
	math::Color color;

	// draw map icons
	gl::enable(GL_TEXTURE_2D);
	gl::begin(gl::Quads);


	for (core::Zone::Content::iterator it = mapwidget_zone->content().begin(); it != mapwidget_zone->content().end(); it++)
	{
		core::Entity *entity = (*it);

		bool draw_icon = false;
		
		icon_location.assign(map_center);
		
		if (targets::is_valid_map_target(entity))
		{
			draw_icon = true;
			icon_location[0] -= map_size / scale * entity->location().y();
			icon_location[1] -= map_size / scale * entity->location().x();
			
			if (math::distancesquared(cursor, icon_location) < (r*r))
			{
				mapwidget_hover_id = entity->id();
			}
			
			if (entity == mapwidget_target)
			{
				if (core::application()->time() - floorf(core::application()->time()) < 0.5f)
				{
					draw_icon = false;
				}
			}
		}

		if (draw_icon)
		{
			color.assign(entity->color());
			color.a = 1.0f;
			
			if (entity->type() == core::Entity::Globe)
			{
				// FIXME this is copy paste from the renderer and can use a cleanup
				core::EntityGlobe *globe = static_cast<core::EntityGlobe *>(entity);

				if (globe->has_flag(core::Entity::Bright))
				{
					
					gl::end();
					
					// load globe corona  texture
					if (!globe->corona_id() && globe->coronaname().size())
					{
						
						globe->set_corona_id(render::Textures::load("textures/" + globe->coronaname()));
						if (!globe->corona_id())
						{
							globe->set_coronaname("");
						}
					}
					
					// draw corona
					if (globe->corona_id())
					{
						texture_current = render::Textures::bind(globe->corona_id());
						
						gl::begin(gl::Quads);
						gl::color(color);
						glTexCoord2f(0.0f, 0.0f);
						gl::vertex(icon_location.x() - r * 2.0f, icon_location.y() - r * 2.0f);

						glTexCoord2f(1.0f, 0.0f);
						gl::vertex(icon_location.x() + r * 2.0f, icon_location.y() - r * 2.0f);

						glTexCoord2f(1.0f, 1.0f);
						gl::vertex(icon_location.x() + r * 2.0f, icon_location.y() + r * 2.0f);

						glTexCoord2f(0.0f, 1.0f);
						gl::vertex(icon_location.x() - r * 2.0f, icon_location.y() + r * 2.0f);
						gl::end();
					}
					
					// bind bright globe icon texture
					if (texture_current != texture_bright)
					{
						texture_current = render::Textures::bind(texture_bright);
					}
					
					gl::begin(gl::Quads);

				}
				else
				{
					// bind  globe icon texture
					if (texture_current != texture_globe)
					{
						gl::end();
						texture_current = render::Textures::bind(texture_globe);
						gl::begin(gl::Quads);
					}
				}
			}
			else
			{
				if (texture_current != texture_entity)
				{
					gl::end();
					texture_current = render::Textures::bind(texture_entity);
					gl::begin(gl::Quads);
				}
			}

			if (entity == core::localplayer()->mission_target())
			{
				color.assign(palette()->mission());

			}

			gl::color(color);
			glTexCoord2f(0.0f, 0.0f);
			gl::vertex(icon_location.x() - r, icon_location.y() - r);

			glTexCoord2f(1.0f, 0.0f);
			gl::vertex(icon_location.x() + r, icon_location.y() - r);

			glTexCoord2f(1.0f, 1.0f);
			gl::vertex(icon_location.x() + r, icon_location.y() + r);

			glTexCoord2f(0.0f, 1.0f);
			gl::vertex(icon_location.x() - r, icon_location.y() + r);
		}

	}
	gl::end();

	// draw localcontrol icon
	// TODO draw a ship icon
	if (core::localcontrol()->zone() == mapwidget_zone)
	{
		core::EntityControlable *controlable = core::localcontrol();

		//if (core::localcontrol()->state() != core::Entity::Docked) {
		icon_location.assign(map_center);
		icon_location[0] -= map_size / scale * controlable->location().y();
		icon_location[1] -= map_size / scale * controlable->location().x();
		
		if (core::application()->time() - floorf(core::application()->time()) < 0.5f)
		{
			texture_current = render::Textures::bind(texture_entity);
			gl::begin(gl::Quads);
		
			math::Color color(controlable->color());
			color.a = 1.0f;
			gl::color(color);
			glTexCoord2f(0.0f, 0.0f);
			gl::vertex(icon_location.x() - r, icon_location.y() - r);

			glTexCoord2f(1.0f, 0.0f);
			gl::vertex(icon_location.x() + r, icon_location.y() - r);

			glTexCoord2f(1.0f, 1.0f);
			gl::vertex(icon_location.x() + r, icon_location.y() + r);

			glTexCoord2f(0.0f, 1.0f);
			gl::vertex(icon_location.x() - r, icon_location.y() + r);
			
			gl::end();
		}
	}
	
	gl::disable(GL_TEXTURE_2D);
	
// 	if (has_mouse_focus()) {
// 		if (mapwidget_hover_id)
// 			ui::root()->set_pointer("action", ui::Palette::Highlight);
// 	}
}

} // namespace client