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package io.swagger.parser.processors;

import io.swagger.models.Model;
import io.swagger.models.RefModel;
import io.swagger.models.Swagger;
import io.swagger.parser.ResolverCache;

import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;


public class DefinitionsProcessor {
    private final ResolverCache cache;
    private final Swagger swagger;
    private final ModelProcessor modelProcessor;

    public DefinitionsProcessor(ResolverCache cache, Swagger swagger) {

        this.cache = cache;
        this.swagger = swagger;
        modelProcessor = new ModelProcessor(cache, swagger);
    }

    public void processDefinitions() {
        final Map definitions = swagger.getDefinitions();

        if (definitions == null) {
            return;
        }

        Set keySet = new LinkedHashSet<>();

        // the definitions can grow as we resolve references
        while(definitions.keySet().size() > keySet.size()) {
            processDefinitions(keySet, definitions);
        }
    }

    public void processDefinitions(Set modelKeys, Map definitions) {
        modelKeys.addAll(definitions.keySet());

        for (String modelName : modelKeys) {
            final Model model = definitions.get(modelName);

            String originalRef = model instanceof RefModel ? ((RefModel) model).get$ref() : null;

            modelProcessor.processModel(model);

            //if we process a RefModel here, in the #/definitions table, we want to overwrite it with the referenced value
            if (model instanceof RefModel) {
                final String renamedRef = cache.getRenamedRef(originalRef);

                if (renamedRef != null) {
                    //we definitely resolved the referenced and shoved it in the definitions map
                    // because the referenced model may be in the definitions map, we need to remove old instances
                    final Model resolvedModel = definitions.get(renamedRef);

                    // ensure the reference isn't still in use
                    if(!cache.hasReferencedKey(renamedRef)) {
                        definitions.remove(renamedRef);
                    }

                    // add the new key
                    definitions.put(modelName, resolvedModel);
                }
            }
        }
    }
}