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/*
 * Copyright 2016 The original authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package io.sundr.codegen;

import io.sundr.codegen.model.AttributeKey;
import io.sundr.codegen.model.ClassRef;
import io.sundr.codegen.model.TypeDef;
import io.sundr.codegen.model.TypeDefBuilder;
import io.sundr.codegen.model.TypeRef;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class DefinitionRepository {

    private static DefinitionRepository INSTANCE;

    private final ConcurrentMap definitions = new ConcurrentHashMap();

    //Custom mappings
    private final ConcurrentMap custom = new ConcurrentHashMap();

    private Map snapshot;

    private DefinitionRepository() {
    }

    public static synchronized final DefinitionRepository getRepository() {
        if (INSTANCE == null) {
            INSTANCE = new DefinitionRepository();
        }
        return INSTANCE;
    }

    public TypeDef registerIfAbsent(TypeDef definition) {
        if (definition != null) {
            definitions.putIfAbsent(definition.getFullyQualifiedName(), definition);
        }
        return definition;
    }

    public TypeDef register(TypeDef definition) {
        definitions.put(definition.getFullyQualifiedName(), definition);
        return definition;
    }


    public TypeDef register(TypeDef definition, String... flags) {
        TypeDefBuilder builder = new TypeDefBuilder(definition);
        for (String flag : flags) {
            builder.addToAttributes(new AttributeKey(flag, Boolean.class), true);
        }
        return register(builder.build());
    }

    public TypeDef register(TypeDef definition, AttributeKey... flags) {
        TypeDefBuilder builder = new TypeDefBuilder(definition);
        for (AttributeKey flag : flags) {
            builder.addToAttributes(flag, true);
        }
        return register(builder.build());
    }



    public Set getDefinitions(String... flags) {
        Set result = new LinkedHashSet();
        for (TypeDef candidate : definitions.values()) {
            boolean matches = true;
            for (String flag :flags) {
                AttributeKey attributeKey = new AttributeKey(flag, Boolean.class);
                if (!candidate.hasAttribute(attributeKey) || !(candidate.getAttribute(attributeKey))) {
                   matches = false;
                   break;
                }
            }
            if (matches) {
                result.add(candidate);
            }
        }

        return Collections.unmodifiableSet(result);
    }

    public Set getDefinitions(AttributeKey... attributeKeys) {

        Set result = new LinkedHashSet();
        for (TypeDef candidate : definitions.values()) {
            boolean matches = true;
            for (AttributeKey attributeKey : attributeKeys) {
                if (!candidate.hasAttribute(attributeKey) || !(candidate.getAttribute(attributeKey))) {
                    matches = false;
                    break;
                }
            }
            if (matches) {
                result.add(candidate);
            }
        }

        return Collections.unmodifiableSet(result);
    }

    public TypeDef getDefinition(String fullyQualifiedName) {
       return definitions.get(fullyQualifiedName);
    }

    public TypeDef getDefinition(TypeRef type) {
        if (type instanceof ClassRef) {
            return definitions.get(((ClassRef)type).getFullyQualifiedName());
        }
        return null;
    }

    public Collection getDefinitions() {
       return definitions.values();
    }

    public void updateReferenceMap() {
        snapshot = getReferenceMapInternal();
    }

    public Map getReferenceMap() {
        if (snapshot == null) {
            snapshot = getReferenceMapInternal();
        }
        return snapshot;
    }

    private Map getReferenceMapInternal() {
        Map mapping = new HashMap();
        List refs = new ArrayList();
        for (TypeDef typeDef : getDefinitions()) {
            refs.add(typeDef.toInternalReference());
        }

        //It's best to have predictable order, so that we can generate uniform code.
        Collections.sort(refs, new Comparator() {
            @Override
            public int compare(ClassRef o1, ClassRef o2) {
                return o1.getFullyQualifiedName().compareTo(o2.getFullyQualifiedName());
            }
        });

        for (ClassRef classRef : refs) {
            String key = classRef.getDefinition().getName();
            if (!mapping.containsKey(key)) {
                mapping.put(key, classRef.getDefinition().getFullyQualifiedName());
            }
        }

        mapping.putAll(custom);
        return mapping;
    }

    public String putCustomMapping(String name, String fqn) {
         return custom.put(name, fqn);
    }

    public String removeCustomMapping(String name) {
        return custom.remove(name);
    }

    public boolean customMappingExists(String name) {
        return custom.containsKey(name);
    }

    public void clear() {
        definitions.clear();
    }
}