package useCases

import (
	"RenewCMS/internal/domain/hash"
	"RenewCMS/internal/domain/invite"
	"time"
)

type GetInviteUseCase struct {
	inviteRepository invite.Repository
	hasher           hash.Hasher
}

func NewGetInviteUseCase(inviteRepository invite.Repository, hasher hash.Hasher) *GetInviteUseCase {
	return &GetInviteUseCase{inviteRepository, hasher}
}

func (g *GetInviteUseCase) GetInvite(code string) (invite.Invite, error) {
	return findUsableInvite(g.inviteRepository, g.hasher, code, time.Now())
}

func findUsableInvite(inviteRepository invite.Repository, hasher hash.Hasher, code string, now time.Time) (invite.Invite, error) {
	if code == "" {
		return invite.Invite{}, invite.ErrInviteInvalid
	}

	for _, candidate := range inviteRepository.GetAll() {
		if candidate.AcceptedAt != nil {
			continue
		}
		if hasher.Compare(candidate.HashedCode, code) != nil {
			continue
		}
		if candidate.StatusAt(now) == invite.StatusExpired {
			return invite.Invite{}, invite.ErrInviteExpired
		}
		return candidate, nil
	}

	return invite.Invite{}, invite.ErrInviteInvalid
}