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package ioinformarics.oss.jackson.module.jsonld;

import com.fasterxml.jackson.databind.JsonNode;
import ioinformarics.oss.jackson.module.jsonld.annotation.JsonldType;
import ioinformarics.oss.jackson.module.jsonld.annotation.JsonldTypeFromJavaClass;
import ioinformarics.oss.jackson.module.jsonld.internal.AnnotationConstants;

import java.util.Map;
import java.util.Optional;
import java.util.function.Function;

/**
 * @author Alexander De Leon
 */
public class JsonldResourceBuilder {

    private String _context;
    private String _type;
    private String _id;
    private Function _idSupplier;

    JsonldResourceBuilder(){
    }

    public JsonldResourceBuilder context(String context){
        this._context = context;
        return this;
    }

    public JsonldResourceBuilder type(String type){
        this._type = type;
        return this;
    }

    public JsonldResourceBuilder id(String id){
        this._id = id;
        return this;
    }

    public JsonldResourceBuilder id(Function idSupplier){
        this._idSupplier = idSupplier;
        return this;
    }

    public JsonldResource build(T scopedObj) {
        if(scopedObj == null){
            return null;
        }
        if(Map.class.isAssignableFrom(scopedObj.getClass())){
            return new MapJsonldResource((Map)scopedObj, getContext(scopedObj).orElse(null), getType(scopedObj), getId(scopedObj));
        }
        return new BeanJsonldResource(scopedObj,  getContext(scopedObj).orElse(null), getType(scopedObj), getId(scopedObj));
    }

    protected Optional getContext(T scopedObj) {
        return JsonldContextFactory.multiContext(Optional.ofNullable(_context), JsonldContextFactory.fromAnnotations(scopedObj));
    }

    protected String getId(T scopedObj){
        return Optional.ofNullable(_id).orElse(Optional.ofNullable(_idSupplier).map(f -> f.apply(scopedObj)).orElse(null));
    }

    protected String getType(T scopedObj) {
        return Optional.ofNullable(_type).orElse(dynamicTypeLookup(scopedObj.getClass()));
    }

    static String dynamicTypeLookup(Class objType){
        return Optional.ofNullable(objType.getAnnotation(JsonldType.class))
                .map(JsonldType::value)
                .orElse(typeFromJavaClass(objType));
    }

    static String typeFromJavaClass(Class objType) {
        return Optional.ofNullable(objType.getAnnotation(JsonldTypeFromJavaClass.class))
                .map((t) -> {
                    String prefix = t.namespace();
                    if(prefix.equals(AnnotationConstants.UNASSIGNED)) {
                        prefix = t.namespacePrefix().equals(AnnotationConstants.UNASSIGNED) ? "" : t.namespacePrefix() + ":";
                    }
                    return prefix + objType.getSimpleName();

                })
                .orElse(null);
    }

}