package com.rongyichuang.common.dto;

import java.util.List;

/**
 * 分页响应DTO
 */
public class PageResponse<T> {
    
    private List<T> content;
    private Integer page;
    private Integer size;
    private Long total;
    private Integer totalPages;

    public PageResponse() {}

    public PageResponse(List<T> content, Long total, Integer page, Integer size) {
        this.content = content;
        this.page = page;
        this.size = size;
        this.total = total;
        this.totalPages = (int) Math.ceil((double) total / size);
    }

    // 静态工厂方法
    public static <T> PageResponse<T> of(List<T> content, Long total, PageRequest pageRequest) {
        return new PageResponse<>(content, total, pageRequest.getPage(), pageRequest.getSize());
    }

    // 添加便于GraphQL使用的方法
    public Long getTotalElements() {
        return total;
    }

    public Integer getNumber() {
        return page;
    }

    public Boolean getFirst() {
        return page == 0;
    }

    public Boolean getLast() {
        return page >= totalPages - 1;
    }

    // Getters and Setters
    public List<T> getContent() {
        return content;
    }

    public void setContent(List<T> content) {
        this.content = content;
    }

    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 Long getTotal() {
        return total;
    }

    public void setTotal(Long total) {
        this.total = total;
    }

    public Integer getTotalPages() {
        return totalPages;
    }

    public void setTotalPages(Integer totalPages) {
        this.totalPages = totalPages;
    }
}