package writefreely

import (
	"github.com/writeas/go-webfinger"
	"github.com/writeas/impart"
	"github.com/writeas/web-core/log"
	"github.com/writeas/writefreely/config"
	"net/http"
)

type wfResolver struct {
	db  *datastore
	cfg *config.Config
}

var wfUserNotFoundErr = impart.HTTPError{http.StatusNotFound, "User not found."}

func (wfr wfResolver) FindUser(username string, host, requestHost string, r []webfinger.Rel) (*webfinger.Resource, error) {
	var c *Collection
	var err error
	if wfr.cfg.App.SingleUser {
		c, err = wfr.db.GetCollectionByID(1)
	} else {
		c, err = wfr.db.GetCollection(username)
	}
	if err != nil {
		log.Error("Unable to get blog: %v", err)
		return nil, err
	}
	if wfr.cfg.App.SingleUser {
		// Ensure handle matches user-chosen one on single-user blogs
		if username != c.Alias {
			log.Info("Username '%s' is not handle '%s'", username, c.Alias)
			return nil, wfUserNotFoundErr
		}
	}
	// Only return information if site has federation enabled.
	// TODO: enable two levels of federation? Unlisted or Public on timelines?
	if !wfr.cfg.App.Federation {
		return nil, wfUserNotFoundErr
	}

	res := webfinger.Resource{
		Subject: "acct:" + username + "@" + host,
		Aliases: []string{
			c.CanonicalURL(),
			c.FederatedAccount(),
		},
		Links: []webfinger.Link{
			{
				HRef: c.CanonicalURL(),
				Type: "text/html",
				Rel:  "https://webfinger.net/rel/profile-page",
			},
			{
				HRef: c.FederatedAccount(),
				Type: "application/activity+json",
				Rel:  "self",
			},
		},
	}
	return &res, nil
}

func (wfr wfResolver) DummyUser(username string, hostname string, r []webfinger.Rel) (*webfinger.Resource, error) {
	return nil, wfUserNotFoundErr
}

func (wfr wfResolver) IsNotFoundError(err error) bool {
	return err == wfUserNotFoundErr
}