package database

import (
	"fmt"
	"phc/website/model"
	"phc/website/sl"
)

var Slot = sl.NewSlot[Database]()

type Database interface {
	CreateUser(user model.User) error
	ReadUser(id string) (model.User, error)
	ReadUsers() ([]model.User, error)
	UpdateUser(id string, user model.User) error
	DeleteUser(id string) error
}

type Memory struct {
	Users []model.User
}

func (m *Memory) CreateUser(user model.User) error {
	m.Users = append(m.Users, user)
	return nil
}

func (m *Memory) ReadUser(id string) (model.User, error) {
	for _, u := range m.Users {
		if u.Id == id {
			return u, nil
		}
	}

	return model.User{}, fmt.Errorf(`no user with id "%s"`, id)
}

func (m *Memory) ReadUsers() ([]model.User, error) {
	return m.Users, nil
}

func (m *Memory) UpdateUser(id string, user model.User) error {
	for i, u := range m.Users {
		if u.Id == id {
			m.Users[i] = user
			return nil
		}
	}

	return fmt.Errorf(`no user with id "%s"`, id)
}

func (m *Memory) DeleteUser(id string) error {
	for i, u := range m.Users {
		if u.Id == id {
			m.Users = append(m.Users[:i], m.Users[i+1:]...)
			return nil
		}
	}

	return fmt.Errorf(`no user with id "%s"`, id)
}