/* ResidualVM - A 3D game interpreter
 *
 * ResidualVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 *
 */

#include "common/endian.h"
#include "engines/grim/debug.h"
#include "engines/grim/grim.h"
#include "engines/grim/material.h"
#include "engines/grim/gfx_base.h"
#include "engines/grim/resource.h"
#include "engines/grim/emi/modelemi.h"
#include "engines/grim/emi/animationemi.h"
#include "engines/grim/emi/skeleton.h"

namespace Grim {

struct Vector3int {
	int _x;
	int _y;
	int _z;
	void setVal(int x, int y, int z) {
		_x = x; _y = y; _z = z;
	}
};

struct BoneInfo {
	int _incFac;
	int _joint;
	float _weight;
};

Common::String readLAString(Common::ReadStream *ms) {
	int strLength = ms->readUint32LE();
	char* readString = new char[strLength];
	ms->read(readString, strLength);
	
	Common::String retVal(readString);
	delete[] readString;
	
	return retVal;
}

void EMIMeshFace::loadFace(Common::SeekableReadStream *data) {
	_flags = data->readUint32LE();
	_hasTexture = data->readUint32LE();

	if(_hasTexture)
		_texID = data->readUint32LE();
	_faceLength = data->readUint32LE();
	_faceLength = _faceLength / 3;
	int x = 0, y = 0, z = 0;
	_indexes = new Vector3int[_faceLength];
	int j = 0;
	int readsize;
	if (g_grim->getGamePlatform() == Common::kPlatformPS2) {
		readsize = 4;
	} else {
		readsize = 2;
	}
	for (uint32 i = 0; i < _faceLength; i ++) {
		data->read((char *)&x, readsize);
		data->read((char *)&y, readsize);
		data->read((char *)&z, readsize);
		_indexes[j++].setVal(x,y,z);
	}
}

EMIMeshFace::~EMIMeshFace() {
	delete[] _indexes;
}

void EMIModel::setTex(int index) {
	_mats[index]->select();
}

// May be removed when I get through the conversion
void EMIMeshFace::render() {
	if(_hasTexture) {
		_parent->setTex(_texID);
	}
	//glDrawElements(GL_TRIANGLES, _faceLength * 3, GL_UNSIGNED_INT, _indexes);
}

void EMIModel::loadMesh(Common::SeekableReadStream *data) {
	//int strLength = 0; // Usefull for PS2-strings
	
	Common::String nameString = readLAString(data);

	_sphereData->readFromStream(data);

	_boxData->readFromStream(data);
	_boxData2->readFromStream(data);

	_numTexSets = data->readUint32LE();
	_setType = data->readUint32LE();
	_numTextures = data->readUint32LE();

	_texNames = new Common::String[_numTextures];

	for(uint32 i = 0;i < _numTextures; i++) {
		_texNames[i] = readLAString(data);
		// Every texname seems to be followed by 4 0-bytes (Ref mk1.mesh,
		// this is intentional)
		data->skip(4);
	}

	// 4 unknown bytes - usually with value 19
	data->skip(4);

	_numVertices = data->readUint32LE();

	// Vertices
	_vertices = new Math::Vector3d[_numVertices];
	_drawVertices = new Math::Vector3d[_numVertices];
	for (int i = 0; i < _numVertices; i++) {
		_vertices[i].readFromStream(data);
		_drawVertices[i] = _vertices[i];
	}
	_normals = new Math::Vector3d[_numVertices];
	for (int i = 0; i < _numVertices; i++) {
		_normals[i].readFromStream(data);
	}
	_colorMap = new EMIColormap[_numVertices];
	for (int i = 0; i < _numVertices; ++i) {
		_colorMap[i].r = data->readByte();
		_colorMap[i].g = data->readByte();
		_colorMap[i].b = data->readByte();
		_colorMap[i].a = data->readByte();
	}
	_texVerts = new Math::Vector2d[_numVertices];
	for (int i = 0; i < _numVertices; i++) {
		_texVerts[i].readFromStream(data);
	}

	// Faces

	_numFaces = data->readUint32LE();

	// Handle the empty-faced fx/screen?.mesh-files
	if (data->eos()) {
		_numFaces = 0;
		_faces = NULL;
		return;
	}

	_faces = new EMIMeshFace[_numFaces];

	for(uint32 j = 0;j < _numFaces; j++) {
		_faces[j].setParent(this);
		_faces[j].loadFace(data);
	}

	int hasBones = data->readUint32LE();

	if (hasBones == 1) {
		_numBones = data->readUint32LE();
		_bones = new Bone[_numBones];
		_boneNames = new Common::String[_numBones];
		for(int i = 0;i < _numBones; i++) {
			_bones[i]._boneName = readLAString(data);
			_boneNames[i] = _bones[i]._boneName;
		}

		_numBoneInfos =  data->readUint32LE();
		_boneInfos = new BoneInfo[_numBoneInfos];

		for(int i = 0;i < _numBoneInfos; i++) {
			_boneInfos[i]._incFac = data->readUint32LE();
			_boneInfos[i]._joint = data->readUint32LE();
			_boneInfos[i]._weight = data->readUint32LE();
		}
	} else {
		_numBones = 0;
		_numBoneInfos = 0;
	}
	prepare(); // <- Initialize materials etc.
}

void EMIModel::setSkeleton(Skeleton *skel) {
	_skeleton = skel;
	
	int boneVert = 0;
	delete[] _vertexBoneInfo; _vertexBoneInfo = NULL;
	delete[] _vertexBone; _vertexBone = NULL;
	_vertexBoneInfo = new int[_numBoneInfos];
	_vertexBone = new int[_numBoneInfos]; // Oversized, but yeah.
	
	for (int i = 0; i < _numBoneInfos; i++) {
		_vertexBoneInfo[i] = _skeleton->findJointIndex(_boneNames[_boneInfos[i]._joint], _skeleton->_numJoints);
		
		if (_boneInfos[i]._incFac == 1) {
			_vertexBone[boneVert] = i;
			boneVert++;
		}
	}
	
	Math::Vector3d vertex;
	Math::Matrix4 mat;
	for (int i = 0; i < _numVertices; i++) {
		vertex = _vertices[i];
		if (_vertexBoneInfo[_vertexBone[i]] != -1) {
			mat = _skeleton->_joints[_vertexBoneInfo[_vertexBone[i]]]._absMatrix;
			// TODO, add in math (inverse translate & rotate the vertex by the matrix)
		}
		_vertices[i] = vertex;
	}
}

void EMIModel::prepareForRender() {
	if (!_skeleton)
		return;
	for (int i = 0; i < _numVertices; i++) {
		_drawVertices[i] = _vertices[i];
		int animIndex = _vertexBoneInfo[_vertexBone[i]];
		_skeleton->_joints[animIndex]._finalMatrix.transform(_drawVertices + i, true);
	}
}

void EMIModel::prepare() {
	_mats = new Material*[_numTextures];
	for (uint32 i = 0; i < _numTextures; i++) {
		// HACK: As we dont know what specialty-textures are yet, we skip loading them
		if (!_texNames[i].contains("specialty"))
			_mats[i] = g_resourceloader->loadMaterial(_texNames[i].c_str(), NULL);
	}
	prepareForRender();
}

void EMIModel::draw() {
	prepareForRender();
	// We will need to add a call to the skeleton, to get the modified vertices, but for now,
	// I'll be happy with just static drawing
	for(uint32 i = 0; i < _numFaces; i++) {
		_faces[i].render();
		g_driver->drawEMIModelFace(this, &_faces[i]);
	}
}

EMIModel::EMIModel(const Common::String &filename, Common::SeekableReadStream *data, EMIModel *parent) : _fname(filename) {
	_numVertices = 0;
	_vertices = NULL;
	_drawVertices = NULL;
	_normals = NULL;
	_colorMap = NULL;
	_texVerts = NULL;
	_numFaces = 0;
	_faces = NULL;
	_numTextures = 0;
	_texNames = NULL;
	_mats = NULL;
	_numBones = 0;
	_bones = NULL;
	_boneInfos = NULL;
	_numBoneInfos = 0;
	_vertexBoneInfo = NULL;
	_vertexBone = NULL;
	_skeleton = NULL;
	_sphereData = new Math::Vector4d();
	_boxData = new Math::Vector3d();
	_boxData2 = new Math::Vector3d();
	_numTexSets = 0;
	_setType = 0;

	loadMesh(data);
}

EMIModel::~EMIModel() {
	delete[] _vertices;
	delete[] _drawVertices;
	delete[] _normals;
	delete[] _colorMap;
	delete[] _texVerts;
	delete[] _faces;
	delete[] _texNames;
	delete[] _mats;
	delete[] _bones;
	delete[] _boneInfos;
	delete[] _vertexBone;
	delete[] _vertexBoneInfo;
	delete _sphereData;
	delete _boxData;
	delete _boxData2;
}

} // end of namespace Grim