package settings

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"html"
	"log/slog"
	"net/http"
	"net/url"
	"slices"
	"strings"
	"time"

	"github.com/go-chi/chi/v5"
	"tangled.org/core/api/tangled"
	"tangled.org/core/appview/cloudflare"
	"tangled.org/core/appview/config"
	"tangled.org/core/appview/db"
	"tangled.org/core/appview/email"
	"tangled.org/core/appview/middleware"
	"tangled.org/core/appview/models"
	"tangled.org/core/appview/oauth"
	"tangled.org/core/appview/pages"
	"tangled.org/core/appview/sites"
	"tangled.org/core/appview/state/userutil"
	"tangled.org/core/idresolver"
	"tangled.org/core/tid"

	comatproto "github.com/bluesky-social/indigo/api/atproto"
	"github.com/bluesky-social/indigo/atproto/atclient"
	"github.com/bluesky-social/indigo/atproto/syntax"
	lexutil "github.com/bluesky-social/indigo/lex/util"
	"github.com/google/uuid"
)

type Settings struct {
	Db         *db.DB
	OAuth      *oauth.OAuth
	Pages      *pages.Pages
	Config     *config.Config
	CfClient   *cloudflare.Client
	IdResolver *idresolver.Resolver
	Logger     *slog.Logger
}

func (s *Settings) Router() http.Handler {
	r := chi.NewRouter()

	r.Use(middleware.AuthMiddleware(s.OAuth))

	// settings pages
	r.Get("/", s.profileSettings)
	r.Get("/profile", s.profileSettings)

	r.Route("/keys", func(r chi.Router) {
		r.Get("/", s.keysSettings)
		r.Put("/", s.keys)
		r.Delete("/", s.keys)
	})

	r.Route("/emails", func(r chi.Router) {
		r.Get("/", s.emailsSettings)
		r.Put("/", s.emails)
		r.Delete("/", s.emails)
		r.Get("/verify", s.emailsVerify)
		r.Post("/verify/resend", s.emailsVerifyResend)
		r.Post("/primary", s.emailsPrimary)
	})

	r.Route("/notifications", func(r chi.Router) {
		r.Get("/", s.notificationsSettings)
		r.Put("/", s.updateNotificationPreferences)
	})

	r.Route("/sites", func(r chi.Router) {
		r.Get("/", s.sitesSettings)
		r.Put("/", s.claimSitesDomain)
		r.Delete("/", s.releaseSitesDomain)
	})

	r.Post("/password/request", s.requestPasswordReset)
	r.Post("/password/reset", s.resetPassword)
	r.Post("/deactivate", s.deactivateAccount)
	r.Post("/reactivate", s.reactivateAccount)
	r.Post("/delete/request", s.requestAccountDelete)
	r.Post("/delete/confirm", s.deleteAccount)

	r.Get("/handle", s.elevateForHandle)
	r.Post("/handle", s.updateHandle)

	return r
}

func (s *Settings) isTnglHandle(ctx context.Context, did syntax.DID) (bool, error) {
	userIdent, err := s.IdResolver.ResolveIdent(ctx, did.String())
	if err != nil {
		s.Logger.Error("failed to resolve user ident", "err", err)
		return false, err
	}
	return strings.HasSuffix(userIdent.Handle.String(), s.Config.Pds.UserDomain), nil
}

func (s *Settings) isTnglShUser(ctx context.Context, did syntax.DID) (bool, error) {
	userIdent, err := s.IdResolver.ResolveIdent(ctx, did.String())
	if err != nil {
		s.Logger.Error("failed to resolve user ident", "err", err)
		return false, err
	}
	return strings.TrimRight(userIdent.PDSEndpoint(), "/") == strings.TrimRight(s.Config.Pds.Host, "/"), nil
}

func (s *Settings) sitesSettings(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)

	claim, err := db.GetActiveDomainClaimForDid(s.Db, user.Did)
	if err != nil {
		s.Logger.Error("failed to get domain claim", "err", err)
		claim = nil
	}

	// determine whether the active account has a tngl.sh handle, in which
	// case their sites domain is automatically their handle domain.
	isTnglHandle, _ := s.isTnglHandle(r.Context(), syntax.DID(user.Did))

	s.Pages.UserSiteSettings(w, pages.UserSiteSettingsParams{
		BaseParams:   pages.BaseParamsFromContext(r.Context()),
		Claim:        claim,
		SitesDomain:  s.Config.Sites.Domain,
		IsTnglHandle: isTnglHandle,
	})
}

func (s *Settings) claimSitesDomain(w http.ResponseWriter, r *http.Request) {
	did := s.OAuth.GetDid(r)

	subdomain := strings.TrimSpace(r.FormValue("subdomain"))
	if subdomain == "" {
		s.Pages.Notice(w, "settings-sites-error", "Subdomain cannot be empty.")
		return
	}

	if len(subdomain) < 4 {
		s.Pages.Notice(w, "settings-sites-error", "Subdomain must be at least 4 characters long.")
		return
	}

	if userutil.HasSlur(subdomain) {
		s.Pages.Notice(w, "settings-sites-error", "That subdomain is not allowed.")
		return
	}

	if !isValidSubdomain(subdomain) {
		s.Pages.Notice(w, "settings-sites-error", "Invalid subdomain. Use only lowercase letters, digits, and hyphens. Cannot start or end with a hyphen.")
		return
	}

	sitesDomain := s.Config.Sites.Domain

	if subdomain == sitesDomain {
		s.Pages.Notice(w, "settings-sites-error", fmt.Sprintf("You cannot claim the root domain %q.", sitesDomain))
		return
	}

	fullDomain := subdomain + "." + sitesDomain

	if err := db.ClaimDomain(s.Db, did, fullDomain); err != nil {
		switch {
		case errors.Is(err, db.ErrDomainTaken):
			s.Pages.Notice(w, "settings-sites-error", "That domain is already claimed by another user.")
		case errors.Is(err, db.ErrDomainCooldown):
			s.Pages.Notice(w, "settings-sites-error", "That domain was recently released and is in a 30-day cooldown period. Please try again later.")
		case errors.Is(err, db.ErrAlreadyClaimed):
			s.Pages.Notice(w, "settings-sites-error", "You already have a domain claimed. Release it before claiming a new one.")
		default:
			s.Logger.Error("claiming domain", "err", err)
			s.Pages.Notice(w, "settings-sites-error", "Unable to claim domain at this moment. Try again later.")
		}
		return
	}

	s.Pages.HxRefresh(w)
}

func (s *Settings) releaseSitesDomain(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)
	domain := strings.TrimSpace(r.FormValue("domain"))

	if domain == "" {
		s.Pages.Notice(w, "settings-sites-error", "Domain cannot be empty.")
		return
	}

	isTnglHandle, err := s.isTnglHandle(r.Context(), syntax.DID(user.Did))
	if err != nil {
		s.Pages.Notice(w, "settings-sites-error", "Unable to resolve user identity")
		return
	}
	if isTnglHandle {
		s.Pages.Notice(w, "settings-sites-error", "Your tngl.sh domain is tied to your handle and cannot be released here.")
		return
	}

	if err := db.ReleaseDomain(s.Db, user.Did, domain); err != nil {
		s.Logger.Error("releasing domain", "err", err)
		s.Pages.Notice(w, "settings-sites-error", "Unable to release domain. Make sure it belongs to your account.")
		return
	}

	// Clean up all site data for this DID asynchronously.
	if s.CfClient.Enabled() {
		siteConfigs, err := db.GetRepoSiteConfigsForDid(s.Db, user.Did)
		if err != nil {
			s.Logger.Error("releaseSitesDomain: fetching site configs for cleanup", "err", err)
		}

		if err := db.DeleteRepoSiteConfigsForDid(s.Db, user.Did); err != nil {
			s.Logger.Error("releaseSitesDomain: deleting site configs from db", "err", err)
		}

		go func() {
			ctx := context.Background()

			// Delete each repo's R2 objects.
			for _, sc := range siteConfigs {
				if err := sites.Delete(ctx, s.CfClient, user.Did, sc.RepoRkey); err != nil {
					s.Logger.Error("releaseSitesDomain: R2 delete failed", "did", user.Did, "repo", sc.RepoRkey, "err", err)
				}
			}

			// Delete the single KV entry for the domain.
			if err := sites.DeleteAllDomainMappings(ctx, s.CfClient, domain); err != nil {
				s.Logger.Error("releaseSitesDomain: KV delete failed", "domain", domain, "err", err)
			}
		}()
	}

	s.Pages.HxLocation(w, "/settings/sites")
}

// isValidSubdomain checks that a subdomain label uses only lowercase letters,
// digits, and hyphens, and does not start or end with a hyphen.
func isValidSubdomain(s string) bool {
	if len(s) == 0 || len(s) > 63 {
		return false
	}
	if s[0] == '-' || s[len(s)-1] == '-' {
		return false
	}
	for _, c := range s {
		if !((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '-') {
			return false
		}
	}
	return true
}

func (s *Settings) profileSettings(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)

	punchcardPreferences, err := db.GetPunchcardPreference(s.Db, user.Did)
	if err != nil {
		s.Logger.Error("failed to get punchcard preferences", "err", err)
	}

	isTnglSh, err := s.isTnglShUser(r.Context(), syntax.DID(user.Did))

	// TODO: bring the user state from DB instead of PDS request
	isDeactivated := s.isAccountDeactivated(r.Context(), syntax.DID(user.Did))

	err = s.Pages.UserProfileSettings(w, pages.UserProfileSettingsParams{
		BaseParams:          pages.BaseParamsFromContext(r.Context()),
		PunchcardPreference: punchcardPreferences,
		IsTnglSh:            isTnglSh,
		IsDeactivated:       isDeactivated,
		HandleOpen:          r.URL.Query().Get("handle") == "1",
	})
	if err != nil {
		s.Logger.Error("failed to render settings page", "err", err)
	}
}

func (s *Settings) notificationsSettings(w http.ResponseWriter, r *http.Request) {
	did := s.OAuth.GetDid(r)

	prefs, err := db.GetNotificationPreference(s.Db, did)
	if err != nil {
		s.Logger.Error("failed to get notification preferences", "err", err)
		s.Pages.Notice(w, "settings-notifications-error", "Unable to load notification preferences.")
		return
	}

	primaryEmail, emailErr := db.GetPrimaryEmail(s.Db, did)
	hasVerifiedEmail := emailErr == nil && primaryEmail.Verified

	s.Pages.UserNotificationSettings(w, pages.UserNotificationSettingsParams{
		BaseParams:       pages.BaseParamsFromContext(r.Context()),
		Preferences:      prefs,
		HasVerifiedEmail: hasVerifiedEmail,
	})
}

func (s *Settings) updateNotificationPreferences(w http.ResponseWriter, r *http.Request) {
	did := s.OAuth.GetDid(r)

	prefs := &models.NotificationPreferences{
		UserDid:            syntax.DID(did),
		RepoStarred:        r.FormValue("repo_starred") == "on",
		IssueCreated:       r.FormValue("issue_created") == "on",
		IssueCommented:     r.FormValue("issue_commented") == "on",
		IssueClosed:        r.FormValue("issue_closed") == "on",
		PullCreated:        r.FormValue("pull_created") == "on",
		PullCommented:      r.FormValue("pull_commented") == "on",
		PullMerged:         r.FormValue("pull_merged") == "on",
		Followed:           r.FormValue("followed") == "on",
		UserMentioned:      r.FormValue("user_mentioned") == "on",
		EmailNotifications: r.FormValue("email_notifications") == "on",
	}

	err := s.Db.UpdateNotificationPreferences(r.Context(), prefs)
	if err != nil {
		s.Logger.Error("failed to update notification preferences", "err", err)
		s.Pages.Notice(w, "settings-notifications-error", "Unable to save notification preferences.")
		return
	}

	s.Pages.Notice(w, "settings-notifications-success", "Notification preferences saved successfully.")
}

func (s *Settings) keysSettings(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)
	pubKeys, err := db.GetPublicKeysForDid(s.Db, user.Did)
	if err != nil {
		s.Logger.Error("keys settings", "err", err)
	}

	s.Pages.UserKeysSettings(w, pages.UserKeysSettingsParams{
		BaseParams: pages.BaseParamsFromContext(r.Context()),
		PubKeys:    pubKeys,
	})
}

func (s *Settings) emailsSettings(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)
	emails, err := db.GetAllEmails(s.Db, user.Did)
	if err != nil {
		s.Logger.Error("emails settings", "err", err)
	}

	s.Pages.UserEmailsSettings(w, pages.UserEmailsSettingsParams{
		BaseParams: pages.BaseParamsFromContext(r.Context()),
		Emails:     emails,
	})
}

// buildVerificationEmail creates an email.Email struct for verification emails
func (s *Settings) buildVerificationEmail(emailAddr, did, code string) email.Email {
	verifyURL := s.verifyUrl(did, emailAddr, code)

	return email.Email{
		APIKey:  s.Config.Resend.ApiKey,
		From:    s.Config.Resend.SentFrom,
		To:      emailAddr,
		Subject: "Verify your Tangled email",
		Text: `Click the link below (or copy and paste it into your browser) to verify your email address.
` + verifyURL,
		Html: `<p>Click the link (or copy and paste it into your browser) to verify your email address.</p>
<p><a href="` + verifyURL + `">` + verifyURL + `</a></p>`,
	}
}

// sendVerificationEmail handles the common logic for sending verification emails
func (s *Settings) sendVerificationEmail(w http.ResponseWriter, did, emailAddr, code string, errorContext string) error {
	emailToSend := s.buildVerificationEmail(emailAddr, did, code)

	err := email.SendEmail(emailToSend)
	if err != nil {
		s.Logger.Error("sending email", "err", err)
		s.Pages.Notice(w, "settings-emails-error", fmt.Sprintf("Unable to send verification email at this moment, try again later. %s", errorContext))
		return err
	}

	return nil
}

func (s *Settings) emails(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		s.Pages.Notice(w, "settings-emails", "Unimplemented.")
		s.Logger.Warn("emails: unimplemented method")
		return
	case http.MethodPut:
		did := s.OAuth.GetDid(r)
		emAddr := r.FormValue("email")
		emAddr = strings.TrimSpace(emAddr)

		if !email.IsValidEmail(emAddr) {
			s.Pages.Notice(w, "settings-emails-error", "Invalid email address.")
			return
		}

		// check if email already exists in database
		existingEmail, err := db.GetEmail(s.Db, did, emAddr)
		if err != nil && !errors.Is(err, sql.ErrNoRows) {
			s.Logger.Error("checking for existing email", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to add email at this moment, try again later.")
			return
		}

		if err == nil {
			if existingEmail.Verified {
				s.Pages.Notice(w, "settings-emails-error", "This email is already verified.")
				return
			}

			s.Pages.Notice(w, "settings-emails-error", "This email is already added but not verified. Check your inbox for the verification link.")
			return
		}

		code := uuid.New().String()

		// Begin transaction
		tx, err := s.Db.Begin()
		if err != nil {
			s.Logger.Error("failed to start transaction", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to add email at this moment, try again later.")
			return
		}
		defer tx.Rollback()

		if err := db.AddEmail(tx, models.Email{
			Did:              did,
			Address:          emAddr,
			Verified:         false,
			VerificationCode: code,
		}); err != nil {
			s.Logger.Error("adding email", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to add email at this moment, try again later.")
			return
		}

		if err := s.sendVerificationEmail(w, did, emAddr, code, ""); err != nil {
			return
		}

		// Commit transaction
		if err := tx.Commit(); err != nil {
			s.Logger.Error("failed to commit add-email transaction", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to add email at this moment, try again later.")
			return
		}

		s.Pages.Notice(w, "settings-emails-success", "Click the link in the email we sent you to verify your email address.")
		return
	case http.MethodDelete:
		did := s.OAuth.GetDid(r)
		emailAddr := r.FormValue("email")
		emailAddr = strings.TrimSpace(emailAddr)

		// Begin transaction
		tx, err := s.Db.Begin()
		if err != nil {
			s.Logger.Error("failed to start transaction", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to delete email at this moment, try again later.")
			return
		}
		defer tx.Rollback()

		if err := db.DeleteEmail(tx, did, emailAddr); err != nil {
			s.Logger.Error("deleting email", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to delete email at this moment, try again later.")
			return
		}

		// Commit transaction
		if err := tx.Commit(); err != nil {
			s.Logger.Error("failed to commit delete-email transaction", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to delete email at this moment, try again later.")
			return
		}

		s.Pages.HxLocation(w, "/settings/emails")
		return
	}
}

func (s *Settings) verifyUrl(did string, email string, code string) string {
	return fmt.Sprintf(
		"%s/settings/emails/verify?did=%s&email=%s&code=%s",
		s.Config.Core.BaseUrl(),
		url.QueryEscape(did),
		url.QueryEscape(email),
		url.QueryEscape(code),
	)
}

func (s *Settings) emailsVerify(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query()

	// Get the parameters directly from the query
	emailAddr := q.Get("email")
	did := q.Get("did")
	code := q.Get("code")

	valid, err := db.CheckValidVerificationCode(s.Db, did, emailAddr, code)
	if err != nil {
		s.Logger.Error("checking email verification", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Error verifying email. Please try again later.")
		return
	}

	if !valid {
		s.Pages.Notice(w, "settings-emails-error", "Invalid verification code. Please request a new verification email.")
		return
	}

	// Mark email as verified in the database
	if err := db.MarkEmailVerified(s.Db, did, emailAddr); err != nil {
		s.Logger.Error("marking email as verified", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Error updating email verification status. Please try again later.")
		return
	}

	http.Redirect(w, r, "/settings/emails", http.StatusSeeOther)
}

func (s *Settings) emailsVerifyResend(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		s.Pages.Notice(w, "settings-emails-error", "Invalid request method.")
		return
	}

	did := s.OAuth.GetDid(r)
	emAddr := r.FormValue("email")
	emAddr = strings.TrimSpace(emAddr)

	if !email.IsValidEmail(emAddr) {
		s.Pages.Notice(w, "settings-emails-error", "Invalid email address.")
		return
	}

	// Check if email exists and is unverified
	existingEmail, err := db.GetEmail(s.Db, did, emAddr)
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			s.Pages.Notice(w, "settings-emails-error", "Email not found. Please add it first.")
		} else {
			s.Logger.Error("checking for existing email", "err", err)
			s.Pages.Notice(w, "settings-emails-error", "Unable to resend verification email at this moment, try again later.")
		}
		return
	}

	if existingEmail.Verified {
		s.Pages.Notice(w, "settings-emails-error", "This email is already verified.")
		return
	}

	// Check if last verification email was sent less than 10 minutes ago
	if existingEmail.LastSent != nil {
		timeSinceLastSent := time.Since(*existingEmail.LastSent)
		if timeSinceLastSent < 10*time.Minute {
			waitTime := 10*time.Minute - timeSinceLastSent
			s.Pages.Notice(w, "settings-emails-error", fmt.Sprintf("Please wait %d minutes before requesting another verification email.", int(waitTime.Minutes()+1)))
			return
		}
	}

	// Generate new verification code
	code := uuid.New().String()

	// Begin transaction
	tx, err := s.Db.Begin()
	if err != nil {
		s.Logger.Error("failed to start transaction", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Unable to resend verification email at this moment, try again later.")
		return
	}
	defer tx.Rollback()

	// Update the verification code and last sent time
	if err := db.UpdateVerificationCode(tx, did, emAddr, code); err != nil {
		s.Logger.Error("updating email verification code", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Unable to resend verification email at this moment, try again later.")
		return
	}

	// Send verification email
	if err := s.sendVerificationEmail(w, did, emAddr, code, ""); err != nil {
		return
	}

	// Commit transaction
	if err := tx.Commit(); err != nil {
		s.Logger.Error("failed to commit resend-verification transaction", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Unable to resend verification email at this moment, try again later.")
		return
	}

	s.Pages.Notice(w, "settings-emails-success", "Verification email resent. Click the link in the email we sent you to verify your email address.")
}

func (s *Settings) emailsPrimary(w http.ResponseWriter, r *http.Request) {
	did := s.OAuth.GetDid(r)
	emailAddr := r.FormValue("email")
	emailAddr = strings.TrimSpace(emailAddr)

	if emailAddr == "" {
		s.Pages.Notice(w, "settings-emails-error", "Email address cannot be empty.")
		return
	}

	if err := db.MakeEmailPrimary(s.Db, did, emailAddr); err != nil {
		s.Logger.Error("setting primary email", "err", err)
		s.Pages.Notice(w, "settings-emails-error", "Error setting primary email. Please try again later.")
		return
	}

	s.Pages.HxLocation(w, "/settings/emails")
}

func (s *Settings) keys(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		s.Pages.Notice(w, "settings-keys", "Unimplemented.")
		s.Logger.Warn("keys: unimplemented method")
		return
	case http.MethodPut:
		created := time.Now()
		pubKey := models.PublicKey{
			Did:     s.OAuth.GetDid(r),
			Rkey:    tid.TID(),
			Name:    r.FormValue("name"),
			Key:     strings.TrimSpace(r.FormValue("key")),
			Created: &created,
		}

		if err := pubKey.Validate(); err != nil {
			s.Logger.Error("parsing public key", "err", err)
			s.Pages.NoticeHTML(w, "settings-keys", "That doesn't look like a valid public key. Make sure it's a <strong>public</strong> key.")
			return
		}

		tx, err := s.Db.Begin()
		if err != nil {
			s.Logger.Error("failed to start transaction for adding public key", "err", err)
			s.Pages.Notice(w, "settings-keys", "Unable to add public key at this moment, try again later.")
			return
		}
		defer tx.Rollback()

		if err = db.UpsertPublicKey(tx, pubKey); err != nil {
			s.Logger.Error("adding public key", "err", err)
			s.Pages.Notice(w, "settings-keys", "Failed to add public key.")
			return
		}

		client, err := s.OAuth.AuthorizedClient(r)
		if err != nil {
			s.Pages.Notice(w, "settings-keys", "Failed to authorize. Try again later.")
			return
		}

		// store in pds too
		record := pubKey.AsRecord()
		resp, err := comatproto.RepoPutRecord(r.Context(), client, &comatproto.RepoPutRecord_Input{
			Collection: tangled.PublicKeyNSID,
			Repo:       pubKey.Did,
			Rkey:       pubKey.Rkey,
			Record: &lexutil.LexiconTypeDecoder{
				Val: &record,
			},
		})
		// invalid record
		if err != nil {
			s.Logger.Error("failed to create atproto record", "err", err)
			s.Pages.Notice(w, "settings-keys", "Failed to create record.")
			return
		}

		s.Logger.Info("created atproto record", "uri", resp.Uri)

		err = tx.Commit()
		if err != nil {
			s.Logger.Error("failed to commit add-key transaction", "err", err)
			s.Pages.Notice(w, "settings-keys", "Unable to add public key at this moment, try again later.")
			return
		}

		// return just the new key row so the client appends it in place. the
		// keyadded trigger lets the form reset/close only on success (errors go
		// through Notice, which also returns 200).
		w.Header().Set("HX-Trigger", "keyadded")
		if err := s.Pages.KeyFragment(w, pubKey); err != nil {
			s.Logger.Error("failed to render key fragment", "err", err)
		}
		return

	case http.MethodDelete:
		did := s.OAuth.GetDid(r)
		q := r.URL.Query()

		name := q.Get("name")
		rkey := q.Get("rkey")

		s.Logger.Debug("deleting key", "name", name, "rkey", rkey)

		if rkey == "" {
			if err := db.DeletePublicKeyLegacy(s.Db, did, name); err != nil {
				s.Logger.Error("failed to remove public key", "err", err)
				s.Pages.Notice(w, "settings-keys-delete-error", "Failed to remove public key.")
				return
			}
		} else {
			if err := db.DeletePublicKeyByRkey(s.Db, did, rkey); err != nil {
				s.Logger.Error("failed to remove public key", "err", err)
				s.Pages.Notice(w, "settings-keys-delete-error", "Failed to remove public key.")
				return
			}

			client, err := s.OAuth.AuthorizedClient(r)
			if err != nil {
				s.Logger.Error("failed to authorize client", "err", err)
				s.Pages.Notice(w, "settings-keys-delete-error", "Failed to authorize client.")
				return
			}

			// remove from pds too
			_, err = comatproto.RepoDeleteRecord(r.Context(), client, &comatproto.RepoDeleteRecord_Input{
				Collection: tangled.PublicKeyNSID,
				Repo:       did,
				Rkey:       rkey,
			})

			// invalid record
			if err != nil {
				s.Logger.Error("failed to delete record", "err", err)
				s.Pages.Notice(w, "settings-keys-delete-error", "Failed to remove key.")
				return
			}
		}
		s.Logger.Info("deleted key successfully", "name", name)

		w.Header().Set("HX-Trigger", "keydeleted")
		w.WriteHeader(http.StatusOK)
		return
	}
}

func (s *Settings) elevateForHandle(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)
	if isTngl, _ := s.isTnglShUser(r.Context(), syntax.DID(user.Did)); !isTngl {
		http.Redirect(w, r, "/settings/profile", http.StatusSeeOther)
		return
	}

	sess, err := s.OAuth.ResumeSession(r)
	if err == nil && slices.Contains(sess.Data.Scopes, "identity:handle") {
		http.Redirect(w, r, "/settings/profile?handle=1", http.StatusSeeOther)
		return
	}

	redirectURL, err := s.OAuth.StartElevatedAuthFlow(
		r.Context(), w, r,
		user.Did,
		[]string{"identity:handle"},
		"/settings/profile?handle=1",
	)
	if err != nil {
		s.Logger.Error("failed to start elevated auth flow", "err", err)
		http.Redirect(w, r, "/settings/profile", http.StatusSeeOther)
		return
	}

	http.Redirect(w, r, redirectURL, http.StatusFound)
}

func (s *Settings) updateHandle(w http.ResponseWriter, r *http.Request) {
	user := s.OAuth.GetMultiAccountUser(r)
	if isTngl, _ := s.isTnglShUser(r.Context(), syntax.DID(user.Did)); !isTngl {
		s.Pages.Notice(w, "handle-error", "Handle changes are only available for tngl.sh accounts.")
		return
	}

	handleType := r.FormValue("type")
	handleInput := strings.TrimSpace(r.FormValue("handle"))

	if handleInput == "" {
		s.Pages.Notice(w, "handle-error", "Handle cannot be empty.")
		return
	}

	var newHandle string
	switch handleType {
	case "subdomain":
		if !isValidSubdomain(handleInput) {
			s.Pages.Notice(w, "handle-error", "Invalid handle. Use only lowercase letters, digits, and hyphens.")
			return
		}
		newHandle = handleInput + s.Config.Pds.UserDomain
	case "custom":
		newHandle = handleInput
	default:
		s.Pages.Notice(w, "handle-error", "Invalid handle type.")
		return
	}

	client, err := s.OAuth.AuthorizedClient(r)
	if err != nil {
		s.Logger.Error("failed to get authorized client", "err", err)
		s.Pages.Notice(w, "handle-error", "Failed to authorize. Try logging in again.")
		return
	}

	err = comatproto.IdentityUpdateHandle(r.Context(), client, &comatproto.IdentityUpdateHandle_Input{
		Handle: newHandle,
	})
	if err != nil {
		if strings.Contains(err.Error(), "ScopeMissing") || strings.Contains(err.Error(), "insufficient_scope") {
			redirectURL, elevErr := s.OAuth.StartElevatedAuthFlow(
				r.Context(), w, r,
				user.Did,
				[]string{"identity:handle"},
				"/settings/profile?handle=1",
			)
			if elevErr != nil {
				s.Logger.Error("failed to start elevated auth flow", "err", elevErr)
				s.Pages.Notice(w, "handle-error", "Failed to start re-authorization. Try again later.")
				return
			}

			s.Pages.HxRedirect(w, redirectURL)
			return
		}

		s.Logger.Error("failed to update handle", "err", err)
		msg := err.Error()
		var apiErr *atclient.APIError
		if errors.As(err, &apiErr) && apiErr.Message != "" {
			msg = apiErr.Message
		}
		s.Pages.Notice(w, "handle-error", fmt.Sprintf("Failed to update handle: %s", msg))
		return
	}

	s.Pages.NoticeHTML(w, "handle-success", fmt.Sprintf("Handle updated to <strong>%s</strong>.", html.EscapeString(newHandle)))
}
