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A CBOR-based serialization for Linked Data
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package com.apicatalog.cborld.context;

import java.net.URI;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.function.Consumer;

import com.apicatalog.cborld.mapping.TypeKeyNameMapper;
import com.apicatalog.cborld.mapping.TypeMap;
import com.apicatalog.cursor.MapCursor;
import com.apicatalog.jsonld.JsonLdError;
import com.apicatalog.jsonld.JsonLdOptions;
import com.apicatalog.jsonld.context.ActiveContext;
import com.apicatalog.jsonld.loader.DocumentLoader;
import com.apicatalog.jsonld.processor.ProcessingRuntime;

public class Context {

    private final TypeMap typeMapping;
    private final Collection> appliedContextKeys;
    
    protected Context(TypeMap typeMapping, Collection> appliedContextKeys) {
        this.typeMapping = typeMapping;
        this.appliedContextKeys = appliedContextKeys;
    }
    
    public static Context from(MapCursor document, URI base, DocumentLoader loader) throws JsonLdError {

        final JsonLdOptions options = new JsonLdOptions();
        options.setOrdered(false);
        options.setDocumentLoader(loader);
        options.setBase(base);
        
        final ActiveContext activeContext = new ActiveContext(null, null, ProcessingRuntime.of(options));

        Collection> appliedContextKeys = new LinkedHashSet<>();

        final TypeMap typeMapping = Expansion.with(
                                            activeContext,
                                            document, 
                                            null, base, 
                                            appliedContextKeys::add,
                                            null
                                            )
                                        .typeMapping();

        return new Context(typeMapping, appliedContextKeys);

    }

    public static Context from(MapCursor document, URI base,  DocumentLoader loader, Consumer> appliedContexts, TypeKeyNameMapper typeMapper) throws JsonLdError {

        final JsonLdOptions options = new JsonLdOptions();
        options.setOrdered(false);
        options.setDocumentLoader(loader);
        options.setBase(base);

        final ActiveContext activeContext = new ActiveContext(null, null, ProcessingRuntime.of(options));

        Collection> appliedContextKeys = new LinkedHashSet<>();

        final TypeMap typeMapping = Expansion.with(
                                            activeContext,
                                            document, 
                                            null, base, 
                                            appliedContexts.andThen(appliedContextKeys::add),
                                            typeMapper
                                            )
                                        .typeMapping();

        return new Context(typeMapping, appliedContextKeys);

    }

    public TypeMap getTypeMapping() {
        return typeMapping;
    }
    
    public Collection> getContextKeySets() {
        return appliedContextKeys;
    }
}