package unity

import (
	"errors"
	"lot_interlligentControl/global"
)

type PageParams struct {
	Page int    `json:"page" form:"page"`
	Size int    `json:"size" form:"size"`
	Desc string `json:"desc" form:"desc"`
}

// Paginate 使用给定的DB连接执行分页查询
func Paginate[T any](params PageParams, model T) (result []T, total int64, err error) {
	var count int64
	if err = global.DBLink.Model(model).Count(&count).Error; err != nil {
		return nil, 0, err
	}
	// 计算偏移量并设置分页大小
	offset := (params.Page - 1) * params.Size
	// 执行实际分页查询
	if err = global.DBLink.Offset(offset).Limit(params.Size).Order(params.Desc).Find(&result).Error; err != nil {
		return nil, 0, err
	}
	return result, count, nil
}

// PaginateByID 根据ID进行分页查询
func PaginateByID[T any](id int, params PageParams, model T) (result []T, total int64, err error) {
	var count int64
	if err = global.DBLink.Model(model).Where("create_by = ?", id).Count(&count).Error; err != nil {
		return nil, 0, err
	}
	// 计算偏移量并设置分页大小
	offset := (params.Page - 1) * params.Size
	// 执行实际分页查询
	if err = global.DBLink.Where("create_by = ?", id).Offset(offset).Limit(params.Size).Order(params.Desc).Find(&result).Error; err != nil {
		return nil, 0, err
	}
	return result, count, nil
}

// GetById 根据id查询
func GetById[T any](id int, model T) (T, error) {
	tx := global.DBLink.Where("id = ?", id).First(&model)
	if tx.Error != nil {
		return model, errors.New("查询失败")
	} else {
		return model, nil
	}
}

// DeleteById 根据id删除
func DeleteById[T any](id int, model T) (T, error) {
	tx := global.DBLink.Where("id = ?", id).Delete(&model)
	if tx.Error != nil {
		return model, errors.New("查询失败")
	} else {
		return model, nil
	}
}