package com.rongyichuang.common.dto;

import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;

/**
 * 分页请求DTO
 */
public class PageRequest {
    
    private Integer page = 0;
    private Integer size = 10;
    private String sort;
    private String order = "desc";

    public PageRequest() {}

    public PageRequest(Integer page, Integer size) {
        this.page = page;
        this.size = size;
    }

    /**
     * 转换为Spring Data的Pageable对象
     * 注意：前端页码从1开始，Spring Data页码从0开始，需要转换
     */
    public Pageable toPageable() {
        Sort sortObj = Sort.unsorted();
        if (sort != null && !sort.isEmpty()) {
            Sort.Direction direction = "asc".equalsIgnoreCase(order) ? Sort.Direction.ASC : Sort.Direction.DESC;
            sortObj = Sort.by(direction, sort);
        }
        // 将前端的1-based页码转换为Spring Data的0-based页码
        int springDataPage = Math.max(0, page - 1);
        return org.springframework.data.domain.PageRequest.of(springDataPage, size, sortObj);
    }

    // Getters and Setters
    public Integer getPage() {
        return page;
    }

    public void setPage(Integer page) {
        this.page = page;
    }

    public Integer getSize() {
        return size;
    }

    public void setSize(Integer size) {
        this.size = size;
    }

    public String getSort() {
        return sort;
    }

    public void setSort(String sort) {
        this.sort = sort;
    }

    public String getOrder() {
        return order;
    }

    public void setOrder(String order) {
        this.order = order;
    }
}