package logic

import (
	"errors"
	"git.dragon-labs.de/alphyron/group_helper/models"
)

type groupHelperService struct {
	groupHelperRepo GroupHelperRepository
}

func NewGroupHelperService(groupHelperRepo GroupHelperRepository) GroupHelperService {
	return &groupHelperService{
		groupHelperRepo: groupHelperRepo,
	}
}

func (g groupHelperService) CreateGroup(group *models.Group) (*models.Group, error) {

	if group.GroupID == 0 {
		return nil, errors.New("you need set the group id to create a new group")
	}
	group.FillDefaultValues()

	return g.CreateGroup(group)
}

func (g groupHelperService) UpdateGroup(group *models.Group) (*models.Group, error) {

	if group.GroupID == 0 {
		return nil, errors.New("you need set the group id to update an existing group")
	}

	return g.groupHelperRepo.UpdateGroup(group)
}

func (g groupHelperService) GetGroupByID(groupID int64) (*models.Group, error) {
	return g.groupHelperRepo.GetGroupByID(groupID)
}

func (g groupHelperService) GetGroupDatabaseSize(group *models.Group) (int, error) {
	if group.ID == 0 {
		return -1, errors.New("you need to set the id to get the size of connected users")
	}

	return g.groupHelperRepo.GetGroupDatabaseSize(group)
}

func (g groupHelperService) CreateUser(user *models.User) (*models.User, error) {
	if user.UserID == 0 {
		return nil, errors.New("you need to set the userID to create a new user")
	}

	return g.groupHelperRepo.CreateUser(user)
}

func (g groupHelperService) GetUserByID(userID int64) (*models.User, error) {
	user, err := g.groupHelperRepo.GetUserByID(userID)
	return user, err
}

func (g groupHelperService) UserJoinGroup(user *models.User, group *models.Group) (bool, error) {
	if user.ID == 0 {
		return false, errors.New("you need to give a valid id from the user to join a group")
	}

	if group.ID == 0 {
		return false, errors.New("you need to give a valid id from the group to let a user join")
	}

	return g.groupHelperRepo.UserJoinGroup(user, group)
}

func (g groupHelperService) UserLeaveGroup(user *models.User, group *models.Group) (bool, error) {
	if user.ID == 0 {
		return false, errors.New("you need to give a valid id from the user to leave from group")
	}

	if group.ID == 0 {
		return false, errors.New("you need to give a valid id from the group to let a user leave")
	}

	return g.groupHelperRepo.UserLeaveGroup(user, group)
}

func (g groupHelperService) IsUserInGroup(user *models.User, group *models.Group) (bool, error) {
	if user.ID == 0 {
		return false, errors.New("you need to give a valid id from the user to check if he is in a group")
	}

	if group.ID == 0 {
		return false, errors.New("you need to give a valid id from the group to check if a user is in the group")
	}

	return g.groupHelperRepo.UserJoinGroup(user, group)
}

func (g groupHelperService) ListGroups() ([]*models.Group, error) {
	return g.groupHelperRepo.ListGroups()
}

func (g groupHelperService) ListGroupUsers(group *models.Group) ([]*models.User, error) {
	return g.groupHelperRepo.ListGroupUsers(group)
}

func (g groupHelperService) ListUsers() ([]*models.User, error) {
	return g.groupHelperRepo.ListUsers()
}