package com.dy.common.webUtil;


import com.alibaba.fastjson2.annotation.JSONField;
import io.swagger.v3.oas.annotations.media.Schema;
import lombok.*;

import java.util.Map;

@Data
@ToString
@NoArgsConstructor
@AllArgsConstructor
@Builder
@Schema(name = "查询结果基类")
public class QueryResultVo<T> {

    /**
     * 每页显示的记录数
     */
    @Schema(description = "每页记录数")
    @Builder.Default
    public Integer pageSize = 0 ;
    /**
     * 记录总数
     */
    @Schema(description = "记录总数")
    @Builder.Default
    public Long itemTotal = 0L;
    /**
     * 当前页
     */
    @Schema(description = "当前页")
    @Builder.Default
    public Integer pageCurr = 0;
    /**
     * 总页数
     */
    @Schema(description = "总页数")
    @Builder.Default
    public Integer pageTotal = 0;

    @Schema(description = "数据")
    @Builder.Default
    public T content = null;

    /**
     * 查询开始记录
     */
    @Schema(hidden = true)
    @JSONField(serialize = false)
    public Integer queryStart ;

    /**
     * 查询数量
     */
    @Schema(hidden = true)
    @JSONField(serialize = false)
    public Integer queryCount ;


    public void calculateAndSet(Long itemTotal, Map<String, Object> params) {
        this.itemTotal = itemTotal ;
        if(this.itemTotal == null){
            itemTotal = 0L ;
        }

        if (pageSize < 1) {
            pageSize = 1;
        }
        pageTotal = (int)Math.ceil((double)itemTotal/pageSize);

        if (pageTotal == 0) {
            pageTotal = 1;
        }
        if (pageCurr < 1) {
            pageCurr = 1;
        }
        if (pageCurr > pageTotal) {
            pageCurr = pageTotal;
        }

        //select * from table_name limit 5 ，10;//从第6行开始，检索10行记录，即：检索记录行 6-15
        this.queryStart = (this.pageCurr - 1) * this.pageSize ;
        this.queryCount = this.pageSize ;

        params.put("queryStart", this.queryStart) ;
        params.put("queryCount", this.queryCount) ;
    }

}