package model

import (
	"Panel_development/global"
	"errors"
	"gorm.io/gorm"
)

type ComponentClassify struct {
	gorm.Model
	Name     string              `gorm:"type:varchar(255);not null;unique;comment:组件分类名称" json:"name" validate:"required"`
	ParentId uint                `gorm:"type:int;not null;comment:父组件id" json:"parentId"`
	Child    []ComponentClassify `gorm:"-" json:"child"` // 此字段将不会被GORM迁移至数据库
}

func (cc ComponentClassify) TableName() string {
	return "component_classify"
}

// AddComponentClassify 添加组件分类
func (cc ComponentClassify) AddComponentClassify(cclass ComponentClassify) (ComponentClassify, error) {
	//TODO implement me
	tx := global.DBLink.Create(&cclass)
	if tx.RowsAffected > 0 {
		return ComponentClassify{}, nil
	}
	return ComponentClassify{}, errors.New("添加失败")
}

// GetComponentClassify 获取组件分类
func (cc ComponentClassify) GetComponentClassify() ([]ComponentClassify, error) {
	var roots []ComponentClassify
	err := global.DBLink.Where("parent_id = 0").Find(&roots).Error
	if err != nil {
		return nil, err
	}

	for i := range roots {
		err = recursiveFetchChildren(global.DBLink, &roots[i])
		if err != nil {
			return nil, err
		}
	}
	return roots, nil
}

// 递归获取分类
func recursiveFetchChildren(db *gorm.DB, parent *ComponentClassify) error {
	var children []ComponentClassify
	err := db.Where("parent_id = ?", parent.ID).Find(&children).Error
	if err != nil {
		return err
	}

	for _, child := range children {
		err = recursiveFetchChildren(db, &child)
		if err != nil {
			return err
		}
		parent.Child = append(parent.Child, child)
	}
	return nil
}