/*******************************************************************************

 Copyright (c) 2009, Charles McGarvey
 All rights reserved.
 
 Redistribution   and   use  in  source  and  binary  forms,  with  or  without
 modification, are permitted provided that the following conditions are met:
 
   * Redistributions  of  source  code  must retain the above copyright notice,
     this list of conditions and the following disclaimer.
   * Redistributions  in binary form must reproduce the above copyright notice,
     this  list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
 
 THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*******************************************************************************/

#include <iostream>
#include <map>
#include <vector>

#include "Aabb.hh"
#include "Camera.hh"
#include "Deserializer.hh"
#include "Entity.hh"
#include "Math.hh"
#include "Mippleton.hh"
#include "Octree.hh"
#include "OpenGL.hh"
#include "Scene.hh"
#include "Serializable.hh"
#include "Tilemap.hh"


namespace Mf {


class Scene::SceneImpl : public Mippleton<SceneImpl>
{
	class Scenery : public Entity
	{
	public:
		Scenery(const Matrix4& transform, const std::string& textureName) :
			transformation(transform),
			image(textureName) {}

	protected:
		Matrix4		transformation;
		Tilemap		image;
		bool		blending;
		long		detail;
		bool		fog;
	};

	class TilePanel : public Scenery
	{
	public:
		TilePanel(const Matrix4& transform, const std::string& textureName,
				SerializablePtr root) :
			Scenery(transform, textureName),
			width(1),
			height(1)
		{
			std::map<std::string,SerializablePtr> rootObj;

			if (root->get(rootObj))
			{
				std::map<std::string,SerializablePtr>::iterator it;

				if ((it = rootObj.find("width")) != rootObj.end())
				{
					(*it).second->get(width);
				}
				if ((it = rootObj.find("tiles")) != rootObj.end())
				{
					std::vector<SerializablePtr> theTiles;

					if ((*it).second->get(theTiles))
					{
						std::vector<SerializablePtr>::iterator jt;

						height = theTiles.size() / width;
						int w, h;

						indices.resize(height);

						for (h = height - 1, jt = theTiles.begin();
								jt != theTiles.end(); h--)
						{
							std::vector<Tilemap::Index> row;

							for (w = 0; w < width && jt != theTiles.end();
									w++, jt++)
							{
								long index;

								if ((*jt)->get(index))
								{
									row.push_back(Tilemap::Index(index));
								}
							}

							indices[h] = row;
						}
					}
				}
			}
		}

		void draw(Scalar alpha) const
		{
			glPushMatrix();
			//std::cout << "transforming..." << std::endl;
			//std::cout << transformation << std::endl;
			glMultMatrix(transformation.data());

			glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
			image.bind();

			long x, y;
			Scalar xf, yf;

			for (y = 0, yf = 0.0; y < height; y++, yf += 1.0)
			{
				for (x = 0, xf = 0.0; x < width; x++, xf += 1.0)
				{
					Scalar texCoords[8];

					Tilemap::Index index = indices[y][x];

					if (image.getTileCoords(index, texCoords))
					{
						glBegin(GL_TRIANGLE_FAN);
							glTexCoord2f(texCoords[0], texCoords[1]);
							glVertex2f(xf, yf);
							glTexCoord2f(texCoords[2], texCoords[3]);
							glVertex2f(xf+1.0, yf);
							glTexCoord2f(texCoords[4], texCoords[5]);
							glVertex2f(xf+1.0, yf+1.0);
							glTexCoord2f(texCoords[6], texCoords[7]);
							glVertex2f(xf, yf+1.0);
						glEnd();
					}
				}
			}

			glPopMatrix();
		}

		bool isVisible(const Camera& cam)
		{
			return true;
		}

	private:
		long width, height;
		std::vector<std::vector<Tilemap::Index> > indices;
	};

	class Billboard : public Scenery
	{
	public:
		Billboard(const Matrix4& transform, const std::string& textureName,
				SerializablePtr root) :
			Scenery(transform, textureName),
			index(0),
			uScale(1)
		{
			std::map<std::string,SerializablePtr> rootObj;

			if (root->get(rootObj))
			{
				std::map<std::string,SerializablePtr>::iterator it;

				if ((it = rootObj.find("tile")) != rootObj.end())
				{
					long value;
					if ((*it).second->get(value))
					{
						index = Tilemap::Index(value);
					}
				}
				if ((it = rootObj.find("u_scale")) != rootObj.end())
				{
					(*it).second->get(uScale);
				}
				if ((it = rootObj.find("fog")) != rootObj.end())
				{
					(*it).second->get(fog);
				}
				if ((it = rootObj.find("blend")) != rootObj.end())
				{
					(*it).second->get(blending);
				}
			}

			image.getTileCoords(index, texCoords);
		}

		void draw(Scalar alpha) const
		{
			glPushMatrix();
			glMultMatrix(transformation.data());

			if (blending)
			{
				glEnable(GL_BLEND);
				glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			}
			/*if (fog) glEnable(GL_FOG);*/

			glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
			image.bind();

			float increment = 1.0f / float(uScale);
			int x;
			float xf;

			for (x = 0, xf = 0.0f; x < uScale; x++, xf += increment)
			{
			glBegin(GL_TRIANGLE_FAN);
				glTexCoord2f(texCoords[0], texCoords[1]);
				glVertex2f(xf, 0.0f);
				glTexCoord2f(texCoords[2], texCoords[3]);
				glVertex2f(xf+increment, 0.0f);
				glTexCoord2f(texCoords[4], texCoords[5]);
				glVertex2f(xf+increment, 1.0f);
				glTexCoord2f(texCoords[6], texCoords[7]);
				glVertex2f(xf, 1.0f);
			glEnd();
			}

			glDisable(GL_BLEND);
			glDisable(GL_FOG);

			glPopMatrix();
		}

		bool isVisible(const Camera& cam)
		{
			return false;
		}

	private:
		Tilemap::Index	index;
		Scalar			texCoords[8];
		long			uScale;
	};


	static bool loadBox(Aabb& theBox, SerializablePtr obj)
	{
		std::vector<SerializablePtr> numbers;

		if (obj->get(numbers))
		{
			if (numbers.size() == 6)
			{
				double num;

				if (numbers[0]->getNumber(num))
				{
					theBox.min[0] = Scalar(num);
				}
				if (numbers[1]->getNumber(num))
				{
					theBox.min[1] = Scalar(num);
				}
				if (numbers[2]->getNumber(num))
				{
					theBox.min[2] = Scalar(num);
				}
				if (numbers[3]->getNumber(num))
				{
					theBox.max[0] = Scalar(num);
				}
				if (numbers[4]->getNumber(num))
				{
					theBox.max[1] = Scalar(num);
				}
				if (numbers[5]->getNumber(num))
				{
					theBox.max[2] = Scalar(num);
				}
			}
		}

		return false;
	}

public:
	SceneImpl(const std::string& name) :
		Mippleton<SceneImpl>(name)
	{
		loadFromFile();
	}

	~SceneImpl()
	{
	}


	void loadInstructions(SerializablePtr root)
	{
		std::vector<SerializablePtr> rootObj;

		if (root->get(rootObj))
		{
			std::vector<SerializablePtr>::iterator it;

			Matrix4		transform;
			std::string	texture;

			for (it = rootObj.begin(); it != rootObj.end(); it++)
			{
				std::string instruction;

				if ((*it)->get(instruction))
				{
					if (instruction == "reset_transform")
					{
						transform.identity();
					}
					else if (instruction == "translate")
					{
						std::vector<SerializablePtr> values;

						it++;
						if ((*it)->get(values))
						{
							Vector3 vec;

							for (size_t i = 0; i < values.size(); i++)
							{
								double value;

								if (values[i]->getNumber(value))
								{
									vec[i] = value;
								}
							}

							Matrix4 translation;
							cml::matrix_translation(translation, vec);
							transform = translation * transform;
						}
					}
					else if (instruction == "scale")
					{
						std::vector<SerializablePtr> values;

						it++;
						if ((*it)->get(values))
						{
							if (values.size() == 1)
							{
								double value = 1.0;

								values[0]->getNumber(value);

								Matrix4 scaling;
								cml::matrix_uniform_scale(scaling, Scalar(value));
								transform = scaling * transform;
							}
							else if (values.size() == 3)
							{
								Vector3 vec;

								for (size_t i = 0; i < values.size(); i++)
								{
									double value;

									if (values[i]->getNumber(value))
									{
										vec[i] = value;
									}
								}

								Matrix4 scaling;
								cml::matrix_scale(scaling, vec);
								transform = scaling * transform;
							}
						}
					}
					else if (instruction == "rotate")
					{
						std::vector<SerializablePtr> values;

						it++;
						if ((*it)->get(values))
						{
							if (values.size() == 2)
							{
								std::string axis;
								size_t axisIndex = 0;
								double value = 0.0;
								Vector3 vec(0.0, 0.0, 0.0);

								if (values[0]->get(axis))
								{
									if (axis == "x")
									{
										axisIndex = 0;
										vec[0] = 1.0;
									}
									else if (axis == "y")
									{
										axisIndex = 1;
										vec[1] = 1.0;
									}
									else if (axis == "z")
									{
										axisIndex = 2;
										vec[2] = 1.0;
									}
									values[1]->getNumber(value);
								}

								cml::matrix_rotate_about_world_axis(transform,
										axisIndex, Scalar(value * cml::constantsd::rad_per_deg()));
							}
						}
					}
					else if (instruction == "texture")
					{
						it++;
						(*it)->get(texture);
					}
					else if (instruction == "tilemap")
					{
						it++;
						TilePanel* tilePanel = new TilePanel(transform, texture,
								*it);
						boost::shared_ptr<Scenery> sceneItem(tilePanel);
						objects.push_back(sceneItem);
					}
					else if (instruction == "billboard")
					{
						it++;
						Billboard* billboard = new Billboard(transform, texture,
								*it);
						boost::shared_ptr<Scenery> sceneItem(billboard);
						objects.push_back(sceneItem);
					}
				}
			}
		}
	}


	void loadFromFile()
	{
		std::string filePath = Scene::getPathToResource(getName());

		Deserializer deserializer(filePath, true);

		SerializablePtr root = deserializer.deserialize();

		if (root)
		{
			std::map<std::string,SerializablePtr> rootObj;

			if (root->get(rootObj))
			{
				std::map<std::string,SerializablePtr>::iterator it;

				if ((it = rootObj.find("playfield_bounds")) != rootObj.end())
				{
					loadBox(playfieldBounds, (*it).second);
				}
				if ((it = rootObj.find("maximum_bounds")) != rootObj.end())
				{
					loadBox(maximumBounds, (*it).second);
				}
				if ((it = rootObj.find("instructions")) != rootObj.end())
				{
					loadInstructions((*it).second);
				}
			}
		}

		std::cout << "playfield: " << playfieldBounds.min << " ... " <<
			playfieldBounds.max << std::endl;
	}


	void draw(Scalar alpha)
	{
		SceneryVector::iterator it;

		for (it = objects.begin(); it != objects.end(); it++)
		{
			//std::cout << "draw object";
			(*it)->draw(alpha);
		}

		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

		glBindTexture(GL_TEXTURE_2D, 0);
		glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
		playfieldBounds.draw(0.0);

		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	}


	Aabb playfieldBounds;
	Aabb maximumBounds;

	typedef std::vector<boost::shared_ptr<Scenery> > SceneryVector;
	SceneryVector objects;
};


Scene::Scene(const std::string& name) :
	// pass through
	impl_(Scene::SceneImpl::retain(name), &Scene::SceneImpl::release) {}


void Scene::draw(Scalar alpha) const
{
	// pass through
	impl_->draw(alpha);
}

void Scene::refresh()
{
	impl_->objects.clear();
	impl_->loadFromFile();
}


/**
 * Specialized search location for scene files.  They can be found in the
 * "scenes" subdirectory of any of the searched directories.
 */

std::string Scene::getPathToResource(const std::string& name)
{
	return Resource::getPathToResource("scenes/" + name + ".json");
}


} // namespace Mf

/** vim: set ts=4 sw=4 tw=80: *************************************************/