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 *  or more contributor license agreements.  See the NOTICE file
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package org.apache.cayenne.dbsync.merge;

import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
import org.apache.cayenne.dbsync.merge.token.MergerToken;
import org.apache.cayenne.map.DataMap;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

abstract class AbstractMerger implements Merger {

    private MergerDictionaryDiff diff;
    private MergerTokenFactory tokenFactory;
    private DbEntityDictionary originalDictionary;

    AbstractMerger(MergerTokenFactory tokenFactory) {
        this.tokenFactory = tokenFactory;
    }

    @Override
    public List createMergeTokens(T original, T imported) {
        diff = createDiff(original, imported);

        List tokens = new ArrayList<>();

        for(MergerDiffPair pair : diff.getMissing()) {
            Collection tokensForMissing = createTokensForMissing(pair);
            if(tokensForMissing != null) {
                tokens.addAll(tokensForMissing);
            }
        }

        for(MergerDiffPair pair : diff.getSame()) {
            Collection tokensForSame = createTokensForSame(pair);
            if(tokensForSame != null) {
                tokens.addAll(tokensForSame);
            }
        }

        return tokens;
    }

    MergerDictionaryDiff getDiff() {
        return diff;
    }

    MergerTokenFactory getTokenFactory() {
        return tokenFactory;
    }

    private Collection createTokensForMissing(MergerDiffPair missing) {
        if(missing.getOriginal() == null) {
            return createTokensForMissingOriginal(missing.getImported());
        } else {
            return createTokensForMissingImported(missing.getOriginal());
        }
    }

    public abstract List createMergeTokens();

    abstract MergerDictionaryDiff createDiff(T original, T imported);

    abstract Collection createTokensForMissingOriginal(M imported);

    abstract Collection createTokensForMissingImported(M original);

    abstract Collection createTokensForSame(MergerDiffPair same);

    public void setOriginalDictionary(DbEntityDictionary originalDictionary) {
        this.originalDictionary = originalDictionary;
    }

    public DbEntityDictionary getOriginalDictionary() {
        return originalDictionary;
    }
}