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/*
 * Copyright MapStruct Authors.
 *
 * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package org.mapstruct.ap.internal.conversion;

import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.mapstruct.ap.internal.model.TypeConversion;
import org.mapstruct.ap.internal.model.common.Assignment;
import org.mapstruct.ap.internal.model.common.ConversionContext;
import org.mapstruct.ap.internal.model.HelperMethod;
import org.mapstruct.ap.internal.model.common.Type;

/**
 * Base class for {@link ConversionProvider}s creating {@link TypeConversion}s which don't declare any exception types.
 *
 * @author Gunnar Morling
 */
public abstract class SimpleConversion implements ConversionProvider {

    @Override
    public Assignment to(ConversionContext conversionContext) {
        String toExpression = getToExpression( conversionContext );
        return new TypeConversion( getToConversionImportTypes( conversionContext ),
            getToConversionExceptionTypes( conversionContext ),
            toExpression
        );
    }

    @Override
    public Assignment from(ConversionContext conversionContext) {
        String fromExpression = getFromExpression( conversionContext );
        return new TypeConversion( getFromConversionImportTypes( conversionContext ),
            getFromConversionExceptionTypes( conversionContext ),
            fromExpression
        );
    }

    @Override
    public List getRequiredHelperMethods(ConversionContext conversionContext) {
        return Collections.emptyList();
    }

    /**
     * Returns the conversion string from source to target. The placeholder {@code } can be used to represent a
     * reference to the source value.
     *
     * @param conversionContext A context providing optional information required for creating the conversion.
     *
     * @return The conversion string from source to target
     */
    protected abstract String getToExpression(ConversionContext conversionContext);

    /**
     * Returns the conversion string from target to source. The placeholder {@code } can be used to represent a
     * reference to the target value.
     *
     * @param conversionContext ConversionContext providing optional information required for creating the conversion.
     *
     * @return The conversion string from target to source
     */
    protected abstract String getFromExpression(ConversionContext conversionContext);

    /**
     * Returns a set with imported types of the "from" conversion. Defaults to an empty set; can be overridden in
     * sub-classes to return the required types.
     *
     * @param conversionContext the conversion context
     *
     * @return conversion types required in the "from" conversion
     */
    protected Set getFromConversionImportTypes(ConversionContext conversionContext) {
        return Collections.emptySet();
    }

    /**
     * Returns a set with imported types of the "to" conversion. Defaults to an empty set; can be overridden in
     * sub-classes to return the required types.
     *
     * @param conversionContext the conversion context
     *
     * @return conversion types required in the "to" conversion
     */
    protected Set getToConversionImportTypes(ConversionContext conversionContext) {
        return Collections.emptySet();
    }

    protected List getToConversionExceptionTypes(ConversionContext conversionContext) {
        return Collections.emptyList();
    }

    protected List getFromConversionExceptionTypes(ConversionContext conversionContext) {
        return Collections.emptyList();
    }

}