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/*
 * Copyright 2017-2020 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
 *
 * https://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.micronaut.data.spring.runtime;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Internal;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.Sort;

import java.util.Optional;

/**
 * Supports representing a Spring Pageable as a Micronaut {@link Pageable}.
 *
 * @author graemerocher
 * @since 1.0.0
 */
@Internal
class PageableDelegate implements Pageable {

    private final org.springframework.data.domain.Pageable target;

    /**
     * Default constructor.
     * @param target The pageable target
     */
    PageableDelegate(org.springframework.data.domain.Pageable target) {
        this.target = target;
    }

    @Override
    public int getNumber() {
        return target.getPageNumber();
    }

    @Override
    public int getSize() {
        return target.getPageSize();
    }

    @Override
    public Mode getMode() {
        return Mode.OFFSET;
    }

    @Override
    public Optional cursor() {
        return Optional.empty();
    }

    @Override
    public boolean requestTotal() {
        return true;
    }

    @Override
    public long getOffset() {
        return target.getOffset();
    }

    @NonNull
    @Override
    public Sort getSort() {
        return new SortDelegate(target.getSort());
    }

    @Override
    public Pageable withTotal() {
        return this;
    }

    @Override
    public Pageable withoutTotal() {
        throw new IllegalStateException("Disabling requesting total is not supported for current Pageable");
    }
}