package deadlinks

import (
	"fmt"
	"time"
)

// ResourceStatus describes what state a particular Resource is in.
type ResourceStatus int

// Enumeration of ResourceStatus values.
const (
	ResourceStatusUnknown ResourceStatus = iota
	ResourceStatusOK
	ResourceStatusError
)

func (ds ResourceStatus) String() string {
	switch ds {
	case ResourceStatusUnknown:
		return "UNKNOWN"
	case ResourceStatusOK:
		return "OK"
	case ResourceStatusError:
		return "ERROR"
	default:
		panic(fmt.Sprintf("unknown ResourceStatus: %#v", ds))
	}
}

// Resource describes the current state of a resource, with the resource being
// uniquely identified by a URL.
type Resource struct {
	URL         URL
	Status      ResourceStatus `yaml:"-"`
	Pinned      bool           `yaml:"-"`
	LastChecked time.Time      `yaml:"last_checked"`

	// only set if Status == ResourceStatusError
	ErrorString string `yaml:"error"`

	// Indicate the URLs of resources which link to/are linked from this
	// resource.
	IncomingLinkURLs []URL `yaml:"incoming_links"`
	OutgoingLinkURLs []URL `yaml:"outgoing_links"`
}