package org.gcube.informationsystem.utils.documentation.generator;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import org.gcube.informationsystem.base.reference.AccessType;
import org.gcube.informationsystem.model.reference.entities.Entity;
import org.gcube.informationsystem.model.reference.properties.Property;
import org.gcube.informationsystem.model.reference.relations.Relation;
import org.gcube.informationsystem.types.TypeMapper;
import org.gcube.informationsystem.types.reference.Type;
import org.gcube.informationsystem.types.reference.entities.FacetType;
import org.gcube.informationsystem.types.reference.entities.ResourceType;
import org.gcube.informationsystem.types.reference.properties.PropertyType;
import org.gcube.informationsystem.types.reference.relations.ConsistsOfType;
import org.gcube.informationsystem.types.reference.relations.IsRelatedToType;
import org.gcube.informationsystem.utils.documentation.model.DocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.entities.EntityDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.entities.FacetDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.entities.ResourceDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.properties.PropertyDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.relations.ConsistsOfDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.relations.IsRelatedToDocumentationGenerator;
import org.gcube.informationsystem.utils.documentation.model.relations.RelationDocumentationGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class TypeListGenerator {

	private static final Logger logger = LoggerFactory.getLogger(TypeListGenerator.class);
	
	public static final String PROPERTIES_FILENAME = "properties.rst";
	public static final String ENTITIES_FILENAME = "entities.rst";
	public static final String RELATIONS_FILENAME = "relations.rst";
	
	protected List<PropertyType<Property>> propertyTypes;
	protected List<ResourceType> resourceTypes;
	protected List<FacetType> facetTypes;
	protected List<IsRelatedToType> isRelatedToTypes;
	protected List<ConsistsOfType> consistsOfTypes;
	
	protected int offsetLevel;
	
	public TypeListGenerator() {
		this.propertyTypes = new ArrayList<>();
		this.resourceTypes = new ArrayList<>();
		this.facetTypes = new ArrayList<>();
		this.isRelatedToTypes = new ArrayList<>();
		this.consistsOfTypes = new ArrayList<>();
		this.offsetLevel = 2;
	}
	
	public List<ResourceType> getResourceTypes() {
		return resourceTypes;
	}

	public void setResourceTypes(List<ResourceType> resources) {
		this.resourceTypes = resources;
	}

	public List<FacetType> getFacetTypes() {
		return facetTypes;
	}

	public void setFacetTypes(List<FacetType> facets) {
		this.facetTypes = facets;
	}

	public List<IsRelatedToType> getIsRelatedToTypes() {
		return isRelatedToTypes;
	}

	public void setIsRelatedToTypes(List<IsRelatedToType> isRelatedToTypes) {
		this.isRelatedToTypes = isRelatedToTypes;
	}

	public List<ConsistsOfType> getConsistsOfTypes() {
		return consistsOfTypes;
	}

	public void setConsistsOfTypes(List<ConsistsOfType> consistsOfTypes) {
		this.consistsOfTypes = consistsOfTypes;
	}
	
	public void addType(Type type) {
		switch (type.getAccessType()) {
			case PROPERTY:
				@SuppressWarnings("unchecked")
				PropertyType<Property> p = (PropertyType<Property>) type;
				propertyTypes.add(p);
				break;
		
			case RESOURCE:
				ResourceType r = (ResourceType) type;
				resourceTypes.add(r);
				break;
	
			case FACET:
				FacetType f = (FacetType) type;
				facetTypes.add(f);
				break;
			
			case IS_RELATED_TO:
				IsRelatedToType irt = (IsRelatedToType) type;
				isRelatedToTypes.add(irt);
				break;
				
			case CONSISTS_OF:
				ConsistsOfType co = (ConsistsOfType) type;
				consistsOfTypes.add(co);
				break;
				
			default:
				break;
		}
	}
	
	
	protected File getFile(String fileName, boolean newFile) throws IOException {
		File file = new File(fileName);
		
		if(file.exists() && newFile) {
			file.delete();
		}

		if(!file.exists()) {
			logger.info("Going to create {}", file.getAbsolutePath());
			file.createNewFile();
		}
		
		return file;
	}
	
	public void checkList(List<? extends Type> list) throws Exception {
		Type first = list.get(0);
		AccessType accessType = first.getAccessType();
		if(Objects.isNull(list) || list.size()==0) {
			throw new Exception("Please add all " + accessType.getName() + " types before starting generation");
		}
	}
	
	protected DocumentationGenerator getDocumentationGeneratorInstance(Class<? extends DocumentationGenerator> clz, Type type) throws Exception {
		Constructor<? extends DocumentationGenerator> constructor = clz.getConstructor(Type.class);
		return constructor.newInstance(type);
	}
	
	public void elaborateList(List<? extends Type> types) throws Exception {
		Type first = types.get(0);
		AccessType accessType = first.getAccessType();
		Class<? extends DocumentationGenerator> clz;
		File f;
		switch (accessType) {
			case PROPERTY:
				clz = PropertyDocumentationGenerator.class;
				f = getFile(PROPERTIES_FILENAME, true);
				break;
		
			case RESOURCE:
				clz = ResourceDocumentationGenerator.class;
				f = getFile(ENTITIES_FILENAME, false);
				break;
	
			case FACET:
				clz = FacetDocumentationGenerator.class;
				f = getFile(ENTITIES_FILENAME, false);
				break;
			
			case IS_RELATED_TO:
				clz = IsRelatedToDocumentationGenerator.class;
				f = getFile(RELATIONS_FILENAME, false);
				break;
				
			case CONSISTS_OF:
				clz = ConsistsOfDocumentationGenerator.class;
				f = getFile(RELATIONS_FILENAME, false);
				break;
				
			default:
				throw new Exception("List of types not recognized");
		}
		
		for(Type type : types) {
			DocumentationGenerator dg = getDocumentationGeneratorInstance(clz, type);
			dg.setOffsetLevel(offsetLevel);
			StringBuffer sb = dg.generateSection();
			Files.write(f.toPath(), sb.toString().getBytes(), StandardOpenOption.APPEND);
		}
	}
	
	public void generate() throws Exception {
		checkList(propertyTypes);
		checkList(resourceTypes);
		checkList(facetTypes);
		checkList(isRelatedToTypes);
		checkList(consistsOfTypes);
		
		elaborateList(propertyTypes);
		
		File f = getFile(ENTITIES_FILENAME, true);
		DocumentationGenerator edg = new EntityDocumentationGenerator(TypeMapper.createTypeDefinition(Entity.class));
		edg.setOffsetLevel(offsetLevel);
		StringBuffer sb = edg.generateSection();
		Files.write(f.toPath(), sb.toString().getBytes(), StandardOpenOption.APPEND);
		
		elaborateList(resourceTypes);
		elaborateList(facetTypes);
		
		f = getFile(RELATIONS_FILENAME, true);
		DocumentationGenerator rdg = new RelationDocumentationGenerator(TypeMapper.createTypeDefinition(Relation.class));
		rdg.setOffsetLevel(offsetLevel);
		sb = rdg.generateSection();
		Files.write(f.toPath(), sb.toString().getBytes(), StandardOpenOption.APPEND);
		
		elaborateList(isRelatedToTypes);
		elaborateList(consistsOfTypes);
	}
	
}