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

 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 <map>
#include <vector>

#include "Aabb.hh"
#include "Camera.hh"
#include "Entity.hh"
#include "Log.hh"
#include "Math.hh"
#include "Scene.hh"
#include "Script.hh"
#include "Settings.hh"
#include "Tilemap.hh"


namespace Mf {


static std::string getPath(const std::string& name)
{
	return Resource::getPath("scenes/" + name + ".lua");
}


struct Meh
{
	Matrix4		transform;
	std::string	texture;

	OctreeP		octree;

	Meh()
	{
		octree = Octree::alloc(Aabb());
	}

	static int loadBox(Script& script, Aabb& aabb)
	{
		Script::Value table[] = {script[1], script[2]};

		if (!table[0].isTable() || !table[1].isTable())
		{
			logWarning("wrong arguments to setPlayfieldBounds; ignoring...");
			return 0;
		}

		for (int i = 0; i <= 1; ++i)
		{
			for (int j = 1; j <= 3; ++j)
			{
				script.push((long)j);
				table[i].pushField();
			}
		}

		script[3].get(aabb.min[0]);
		script[4].get(aabb.min[1]);
		script[5].get(aabb.min[2]);
		script[6].get(aabb.max[0]);
		script[7].get(aabb.max[1]);
		script[8].get(aabb.max[2]);

		return 0;
	}

	int setPlayfieldBounds(Script& script)
	{
		Aabb bounds;
		return loadBox(script, bounds);
	}

	int setMaximumBounds(Script& script)
	{
		Aabb bounds;
		int ret = loadBox(script, bounds);
		octree = Octree::alloc(bounds);
		return ret;
	}

	int resetTransform(Script& script)
	{
		transform.identity();
		return 0;
	}

	int translate(Script& script)
	{
		Script::Value x = script[1];
		Script::Value y = script[2];
		Script::Value z = script[3];

		if (!x.isNumber() || !y.isNumber() || !z.isNumber())
		{
			logWarning("wrong arguments to translate; ignoring...");
			return 0;
		}

		Vector3 vec;
		x.get(vec[0]);
		y.get(vec[1]);
		z.get(vec[2]);

		Matrix4 translation;
		cml::matrix_translation(translation, vec);
		transform = translation * transform;

		return 0;
	}

	int scale(Script& script)
	{
		if (script.getSize() == 3)
		{
			Vector3 vec;
			script[1].get(vec[0]);
			script[2].get(vec[1]);
			script[3].get(vec[2]);

			Matrix4 scaling;
			cml::matrix_scale(scaling, vec);
			transform = scaling * transform;
		}
		else if (script.getSize() == 1)
		{
			Scalar value = 1.0;
			script[1].get(value);

			Matrix4 scaling;
			cml::matrix_uniform_scale(scaling,
					Scalar(value));
			transform = scaling * transform;
		}
		else
		{
			logWarning("wrong arguments to scale; ignoring...");
		}

		return 0;
	}

	int rotate(Script& script)
	{
		Script::Value a = script[1];
		Script::Value d = script[2];

		if (!a.isString() || !d.isNumber())
		{
			logWarning("wrong arguments to rotate; ignoring...");
			return 0;
		}

		std::string axis;
		a.get(axis);

		size_t index = 0;
		if (axis == "x")      index = 0;
		else if (axis == "y") index = 1;
		else if (axis == "z") index = 2;

		Scalar value;
		d.get(value);

		cml::matrix_rotate_about_world_axis(transform,
				index, cml::rad(Scalar(value)));

		return 0;
	}

	int setTexture(Script& script)
	{
		Script::Value t = script[1];

		if (t.isString()) t.get(texture);
		else logWarning("wrong arguments to setTexture; ignoring...");

		return 0;
	}

	int makeTilemap(Script& script)
	{
		Script::Value table = script[1];
		Script::Value top = script[-1];

		if (!table.isTable())
		{
			logWarning("wrong arguments to makeTilemap; ignoring...");
			return 0;
		}

		long width = 1;
		long height = 1;

		table.pushField("width");
		top.get(width);

		long nTiles = 0;

		table.pushField("tiles");
		Script::Value tiles = script.getTop();
		nTiles = tiles.getLength();

		std::vector< std::vector<Tilemap::Index> > indices;

		if (nTiles % width == 0)
		{
			int i, w, h;

			height = nTiles / width;
			indices.resize(height);

			// the indices are stored upside-down in the scene file so that they
			// are easier to edit as text, so we'll need to load them last row
			// first

			i = 1;
			for (h = height - 1; h >= 0; --h)
			{
				std::vector<Tilemap::Index> row;

				for (w = 0; w < width; ++w, ++i)
				{
					script.checkStack(2);
					script.push(long(i));
					tiles.pushField();

					long index;
					top.get(index);

					row.push_back(Tilemap::Index(index));
				}

				indices[h] = row;
			}
		}
		else
		{
			logError("invalid tiles in tilemap instruction");
			return 0;
		}

		Vector4 vertices[height+1][width+1];

		Matrix4 transposedTransform = transform;
		transposedTransform.transpose();

		for (int h = 0; h <= height; ++h)
		{
			for (int w = 0; w <= width; ++w)
			{
				vertices[h][w] = Vector4(Scalar(w), Scalar(h), 0.0, 1.0) *
					transposedTransform;
			}
		}

		for (int h = 0; h < height; ++h)
		{
			for (int w = 0; w < width; ++w)
			{
				if (indices[h][w] == Tilemap::NO_TILE) continue;

				Vector3 quadVertices[4];

				demoteVector(quadVertices[0], vertices[h][w]);
				demoteVector(quadVertices[1], vertices[h][w+1]);
				demoteVector(quadVertices[2], vertices[h+1][w+1]);
				demoteVector(quadVertices[3], vertices[h+1][w]);

				Quad* quad = new Quad(quadVertices, texture, indices[h][w]);
				boost::shared_ptr<Quad> quadPtr(quad);

				octree->insert(quadPtr);
			}
		}

		return 0;
	}

	int makeBillboard(Script& script)
	{
		Script::Value table = script[1];
		Script::Value top = script[-1];

		long	index = 0;
		long	width = 1;
		bool	blending = false;
		bool	fog = false;

		if (table.isTable())
		{
			table.pushField("tile");
			if (top.isNumber()) top.get(index);

			table.pushField("u_scale");
			if (top.isNumber()) top.get(width);

			table.pushField("blend");
			if (top.isBoolean()) top.get(blending);

			table.pushField("fog");
			if (top.isBoolean()) top.get(fog);
		}

		Vector4 vertices[2][width+1];

		Matrix4 transposedTransform = transform;
		transposedTransform.transpose();

		Scalar xf;
		Scalar increment = 1.0 / Scalar(width);

		for (int h = 0; h <= 1; ++h)
		{
			xf = 0.0;
			for (int w = 0; w <= width; ++w, xf += increment)
			{
				vertices[h][w] = Vector4(xf, Scalar(h), 0.0, 1.0) *
					transposedTransform;
			}
		}

		for (int w = 0; w < width; ++w)
		{
			Vector3 quadVertices[4];

			demoteVector(quadVertices[0], vertices[0][w]);
			demoteVector(quadVertices[1], vertices[0][w+1]);
			demoteVector(quadVertices[2], vertices[1][w+1]);
			demoteVector(quadVertices[3], vertices[1][w]);

			Quad* quad = new Quad(quadVertices, texture, Tilemap::Index(index));
			quad->setBlending(blending);
			quad->setFog(fog);

			boost::shared_ptr<Quad> quadPtr(quad);

			octree->insert(quadPtr);
		}

		return 0;
	}
};


static void importScriptBindings(Script& script, Meh& scene)
{
	script.importFunction("SetPlayfieldBounds",
			boost::bind(&Meh::setPlayfieldBounds, &scene, _1));
	script.importFunction("SetMaximumBounds",
			boost::bind(&Meh::setMaximumBounds, &scene, _1));
	script.importFunction("ResetTransform",
			boost::bind(&Meh::resetTransform, &scene, _1));
	script.importFunction("Translate",
			boost::bind(&Meh::translate, &scene, _1));
	script.importFunction("Scale",
			boost::bind(&Meh::scale, &scene, _1));
	script.importFunction("Rotate",
			boost::bind(&Meh::rotate, &scene, _1));
	script.importFunction("SetTexture",
			boost::bind(&Meh::setTexture, &scene, _1));
	script.importFunction("MakeTilemap",
			boost::bind(&Meh::makeTilemap, &scene, _1));
	script.importFunction("MakeBillboard",
			boost::bind(&Meh::makeBillboard, &scene, _1));
}


OctreeP loadScene(const std::string& name)
{
	std::string filePath = getPath(name);

	Meh cool;

	Script script;
	script.importStandardLibraries();
	importLogScript(script);
	importScriptBindings(script, cool);

	long detail = 3;
	Settings::getInstance().get("detail", detail);

	script.push(detail);
	script.set("detail");

	logInfo("doing file...");
	if (script.doFile(filePath) != 0)
	{
		std::string str;
		script[-1].get(str);
		logError("lua error: %s", str.c_str());
	}
	logInfo("done");

	cool.octree->sort();
	return cool.octree;
}


} // namespace Mf

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