package services

import (
	"fmt"

	"github.com/google/uuid"
	"michaelthomson.dev/mthomson/go-todos-app/models"
)

type Db interface {
  List() (todo []models.Todo, err error)
  Get(id uuid.UUID) (todo models.Todo, err error)
  Add(todo models.Todo) (addedTodo models.Todo, err error)
  Delete(id uuid.UUID) (err error)
}

type TodoService struct {
  db Db
}

func NewTodoService(db Db) *TodoService {
  return &TodoService{
    db: db,
  }
}

func (ts *TodoService) AddTodo(name string) (todo models.Todo, err error)  {
  if name == "" {
    return models.Todo{}, fmt.Errorf("Must provide a name")
  }
  return ts.db.Add(models.NewTodo(name, false))
}

func (ts *TodoService) GetTodos() (todos []models.Todo, err error)  {
  return ts.db.List()   
}

func (ts *TodoService) GetTodoById(id uuid.UUID) (todo models.Todo, err error)  {
  return ts.db.Get(id)
}

func (ts *TodoService) DeleteTodoById(id uuid.UUID) (err error)  {
  return ts.db.Delete(id)
}