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package com.couchbase.client.java.repository.mapping;

import com.couchbase.client.java.repository.annotation.Id;

import java.lang.reflect.Field;

/**
 * The property metadata implementation based on java reflection.
 *
 * @author Michael Nitschinger
 * @since 2.2.0
 */
public class ReflectionBasedPropertyMetadata implements PropertyMetadata {

    private final Field fieldReference;
    private final boolean isId;
    private final boolean isField;
    private final String name;
    private final String realName;

    public ReflectionBasedPropertyMetadata(final Field fieldReference) {
        this.fieldReference = fieldReference;

        isId = fieldReference.isAnnotationPresent(Id.class);
        isField = fieldReference.isAnnotationPresent(com.couchbase.client.java.repository.annotation.Field.class);
        realName = fieldReference.getName();
        name = extractName(fieldReference);

        fieldReference.setAccessible(true);
    }

    @Override
    public boolean isId() {
        return isId;
    }

    @Override
    public boolean isField() {
        return isField;
    }

    @Override
    public String name() {
        return name;
    }

    @Override
    public String realName() {
        return realName;
    }

    @Override
    public Class type() {
        return fieldReference.getType();
    }

    @Override
    public Object get(Object source) {
        try {
            return fieldReference.get(source);
        } catch (IllegalAccessException ex) {
            throw new RepositoryMappingException("Could not access field.", ex);
        }
    }

    @Override
    public void set(Object value, Object source) {
        try {
            fieldReference.set(source, value);
        } catch (IllegalAccessException ex) {
            throw new RepositoryMappingException("Could not access field.", ex);
        }
    }

    /**
     * Helper method to extract the potentially aliased name of the field.
     *
     * @param fieldReference the field reference.
     * @return the potentially aliased name of the field.
     */
    private static String extractName(final Field fieldReference) {
        com.couchbase.client.java.repository.annotation.Field annotation =
            fieldReference.getAnnotation(com.couchbase.client.java.repository.annotation.Field.class);
        if (annotation == null || annotation.value() == null || annotation.value().isEmpty()) {
            return fieldReference.getName();
        } else {
            return annotation.value();
        }
    }
}