package system

import (
	"errors"
	"server/dao"
	"strconv"

	systemReq "server/model/system/request"

	"gorm.io/gorm"
	"server/global"
	"server/model/common/request"
)

var ErrRoleExistence = errors.New("存在相同角色id")

//@author: [piexlmax](https://github.com/piexlmax)
//@function: CreateAuthority
//@description: 创建一个角色
//@param: auth model.SysAuthority
//@return: authority system.SysAuthority, err error

type AuthorityService struct{}

var AuthorityServiceApp = new(AuthorityService)

func (authorityService *AuthorityService) CreateAuthority(auth dao.SysAuthority) (authority dao.SysAuthority, err error) {

	_, err = dao.QueryAuthorityById(auth.AuthorityId)

	if !errors.Is(err, gorm.ErrRecordNotFound) {
		return auth, ErrRoleExistence
	}

	e := global.GVA_DB.Transaction(func(tx *gorm.DB) error {

		if err = tx.Create(&auth).Error; err != nil {
			return err
		}

		auth.SysBaseMenus = systemReq.DefaultMenu()
		if err = tx.Model(&auth).Association("SysBaseMenus").Replace(&auth.SysBaseMenus); err != nil {
			return err
		}
		casbinInfos := systemReq.DefaultCasbin()
		authorityId := strconv.Itoa(int(auth.AuthorityId))
		rules := [][]string{}
		for _, v := range casbinInfos {
			rules = append(rules, []string{authorityId, v.Path, v.Method})
		}
		return CasbinServiceApp.AddPolicies(tx, rules)
	})

	return auth, e
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: UpdateAuthority
//@description: 更改一个角色
//@param: auth model.SysAuthority
//@return: authority system.SysAuthority, err error

func (authorityService *AuthorityService) UpdateAuthority(auth dao.SysAuthority) (authority dao.SysAuthority, err error) {
	_, err = dao.QueryAuthorityById(auth.AuthorityId)
	if err != nil {
		global.GVA_LOG.Debug(err.Error())
		return dao.SysAuthority{}, errors.New("查询角色数据失败")
	}
	err = auth.UpdateAuthority()
	return auth, err
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: DeleteAuthority
//@description: 删除角色
//@param: auth *model.SysAuthority
//@return: err error

func (authorityService *AuthorityService) DeleteAuthority(auth *dao.SysAuthority) error {
	if errors.Is(global.GVA_DB.Debug().Preload("Users").First(&auth).Error, gorm.ErrRecordNotFound) {
		return errors.New("该角色不存在")
	}
	if len(auth.Users) != 0 {
		return errors.New("此角色有用户正在使用禁止删除")
	}
	if !errors.Is(global.GVA_DB.Where("authority_id = ?", auth.AuthorityId).First(&dao.SysUser{}).Error, gorm.ErrRecordNotFound) {
		return errors.New("此角色有用户正在使用禁止删除")
	}
	if !errors.Is(global.GVA_DB.Where("parent_id = ?", auth.AuthorityId).First(&dao.SysAuthority{}).Error, gorm.ErrRecordNotFound) {
		return errors.New("此角色存在子角色不允许删除")
	}

	return global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		var err error
		if err = tx.Preload("SysBaseMenus").Preload("DataAuthorityId").Where("authority_id = ?", auth.AuthorityId).First(auth).Unscoped().Delete(auth).Error; err != nil {
			return err
		}

		if len(auth.SysBaseMenus) > 0 {
			if err = tx.Model(auth).Association("SysBaseMenus").Delete(auth.SysBaseMenus); err != nil {
				return err
			}
			// err = db.Association("SysBaseMenus").Delete(&auth)
		}
		if len(auth.DataAuthorityId) > 0 {
			if err = tx.Model(auth).Association("DataAuthorityId").Delete(auth.DataAuthorityId); err != nil {
				return err
			}
		}

		if err = tx.Delete(&dao.SysUserAuthority{}, "sys_authority_authority_id = ?", auth.AuthorityId).Error; err != nil {
			return err
		}
		if err = tx.Where("authority_id = ?", auth.AuthorityId).Delete(&[]dao.SysAuthorityBtn{}).Error; err != nil {
			return err
		}

		authorityId := strconv.Itoa(int(auth.AuthorityId))

		if err = CasbinServiceApp.RemoveFilteredPolicy(tx, authorityId); err != nil {
			return err
		}

		return nil
	})
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: GetAuthorityInfoList
//@description: 分页获取数据
//@param: info request.PageInfo
//@return: list interface{}, total int64, err error

func (authorityService *AuthorityService) GetAuthorityInfoList(info request.PageInfo) (list interface{}, total int64, err error) {
	limit := info.PageSize
	offset := info.PageSize * (info.Page - 1)

	return dao.GetAuthorityInfoList(limit, offset)
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: GetAuthorityInfo
//@description: 获取所有角色信息
//@param: auth model.SysAuthority
//@return: sa system.SysAuthority, err error

func (authorityService *AuthorityService) GetAuthorityInfo(auth dao.SysAuthority) (sa dao.SysAuthority, err error) {
	return auth.GetAuthorityInfo()
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: SetDataAuthority
//@description: 设置角色资源权限
//@param: auth model.SysAuthority
//@return: error

func (authorityService *AuthorityService) SetDataAuthority(auth dao.SysAuthority) error {
	var s dao.SysAuthority
	global.GVA_DB.Preload("DataAuthorityId").First(&s, "authority_id = ?", auth.AuthorityId)
	err := global.GVA_DB.Model(&s).Association("DataAuthorityId").Replace(&auth.DataAuthorityId)
	return err
}

//@author: [piexlmax](https://github.com/piexlmax)
//@function: SetMenuAuthority
//@description: 菜单与角色绑定
//@param: auth *model.SysAuthority
//@return: error

func (authorityService *AuthorityService) SetMenuAuthority(auth *dao.SysAuthority) error {
	var s dao.SysAuthority
	global.GVA_DB.Preload("SysBaseMenus").First(&s, "authority_id = ?", auth.AuthorityId)
	err := global.GVA_DB.Model(&s).Association("SysBaseMenus").Replace(&auth.SysBaseMenus)
	return err
}