package services

import (
	"fmt"

	"github.com/gofrs/uuid/v5"
	"michaelthomson.dev/mthomson/go-todos-app/models"
)

type Db interface {
  List() ([]models.Todo, error)
  Get(id uuid.UUID) (models.Todo, error)
  Add(todo models.Todo) error
  Delete(id uuid.UUID) error
  Update(id uuid.UUID, name string, done bool) error
}

type TodoService struct {
  db Db
}

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

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

  id, err := uuid.NewV4()
  if err != nil {
    return models.Todo{}, err
  }

  err = ts.db.Add(models.NewTodo(id, name, false))

  if err != nil {
    return models.Todo{}, err
  }

  return ts.db.Get(id)
}

func (ts *TodoService) UpdateTodo(id uuid.UUID, name string, done bool) (models.Todo, error)  {
  err := ts.db.Update(id, name, done)   

  if err != nil {
    return models.Todo{}, err
  }

  return ts.db.Get(id)
}

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

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

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