package pfug

import (
	"errors"

	"git.0x0001f346.de/andreas/utils"
)

type User struct {
	UUID         string
	Username     string
	Salt         string
	PasswordHash string
	Mail         string
	FirstName    string
	LastName     string
}

type Group struct {
	UUID        string
	Name        string
	Members     map[string]bool
	Permissions map[string]bool
}

type Permission struct {
	UUID string
	Name string
}

func (u User) ChangePassword(oldPassword string, newPassword string) (User, error) {
	if !u.IsUsingThisPassword(oldPassword) {
		return u, errors.New("wrong password")
	}

	u.PasswordHash = generatePasswordHash(newPassword, u.Salt)

	return u, nil
}

func (u User) IsMemberOfGroup(g Group) bool {
	return g.Members[u.UUID]
}

func (u User) IsUsingThisPassword(password string) bool {
	return generatePasswordHash(password, u.Salt) == u.PasswordHash
}

func (g Group) AddMember(u User) (Group, error) {
	if !utils.IsValidUUID(u.UUID) {
		return g, errors.New("unvalid UUID")
	}

	g.Members[u.UUID] = true

	return g, nil
}

func (g Group) AddPermission(p Permission) (Group, error) {
	if !utils.IsValidUUID(p.UUID) {
		return g, errors.New("unvalid UUID")
	}

	g.Permissions[p.UUID] = true

	return g, nil
}

func (g Group) HasUserAsMember(u User) bool {
	return g.Members[u.UUID]
}

func (g Group) HasPermission(p Permission) bool {
	return g.Permissions[p.UUID]
}

func (g Group) RemoveMember(u User) Group {
	delete(g.Members, u.UUID)
	return g
}

func (g Group) RemovePermission(p Permission) Group {
	delete(g.Permissions, p.UUID)
	return g
}