/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.github.braisdom.objsql.pagination;

public class Page {
    private int page;
    private int pageSize;

    public Page(int page, int pageSize) {
        if(page < 0) {
            throw new IllegalArgumentException("The page must be greater than 0 or equals 0");
        }

        if(pageSize < 0) {
            throw new IllegalArgumentException("The pageSize must be greater than 0 or equals 0");
        }

        this.page = page;
        this.pageSize = pageSize;
    }

    public static Page create(int page, int pageSize) {
        return new Page(page, pageSize);
    }

    public int getPage() {
        return page;
    }

    public int getPageSize() {
        return pageSize;
    }

    public int calculatePageCount(long totalCount) {
        return (int) Math.ceil(((float)totalCount) / ((float)pageSize));
    }

    public long getOffset() {
        return page * pageSize;
    }
}
