package biz

import "context"

type AuthorityAccessRepo interface {
	CreateAuthority(context.Context, *Authority) error
	CopyAuthority(context.Context, uint, *Authority) error
	UpdateAuthority(context.Context, *Authority) error
	DeleteAuthority(context.Context, uint) error
	ListAuthorities(context.Context) ([]*Authority, error)
	SetAuthorityUsers(context.Context, uint, []uint) error
	AuthorityUserIDs(context.Context, uint) ([]uint, error)
	SetDataScope(context.Context, uint, int, []uint) error
	DataScopeDepartmentIDs(context.Context, uint) ([]uint, error)
	ResolveDataScope(context.Context, uint, uint) (DataScope, error)
}

type AuthorityUsecase struct{ AuthorityAccessRepo }

func NewAuthorityUsecase(repo AuthorityAccessRepo) *AuthorityUsecase {
	return &AuthorityUsecase{AuthorityAccessRepo: repo}
}

func (uc *AuthorityUsecase) AuthorityTree(ctx context.Context) ([]*Authority, error) {
	items, err := uc.ListAuthorities(ctx)
	if err != nil {
		return nil, err
	}
	byID := make(map[uint]*Authority, len(items))
	for _, item := range items {
		item.Children = nil
		byID[item.AuthorityID] = item
	}
	roots := make([]*Authority, 0)
	for _, item := range items {
		if item.ParentID != nil && *item.ParentID != 0 && byID[*item.ParentID] != nil {
			parent := byID[*item.ParentID]
			parent.Children = append(parent.Children, item)
		} else {
			roots = append(roots, item)
		}
	}
	return roots, nil
}