// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
package resource

import (
  "errors"
  "fmt"
  "net/url"
)

var (
  ErrUnknownResourceType = errors.New("Unknown resource type")
  ResourceTypes *Types = NewTypes()
)

type TypeFactory func(*url.URL) Resource

type Types struct {
  registry map[string]TypeFactory
}

func NewTypes() *Types {
  return &Types{ registry: make(map[string]TypeFactory) }
}

func (t *Types) Register(name string, factory TypeFactory) {
  t.registry[name] = factory
}

func (t *Types) New(uri string) (Resource, error) {
  u,e := url.Parse(uri)     
  if u == nil || e != nil {
    return nil, fmt.Errorf("%w: %s", ErrUnknownResourceType, e)
  }

  if r,ok := t.registry[u.Scheme]; ok {
    return r(u), nil
  }
  return nil, fmt.Errorf("%w: %s", ErrUnknownResourceType, u.Scheme)
}

func (t *Types) Has(typename string) bool {
  if _,ok := t.registry[typename]; ok {
    return true
  }
  return false
}