feat: add feedback resolver

internal/handler/stats.go

@@ -1,11 +1,14 @@
 package handler
 
 import (
+	"errors"
 	"html/template"
 	"net/http"
 	"time"
 
+	"github.com/go-chi/chi/v5"
 	"github.com/prabhupadasays/spsays-bff/internal/repository"
+	"github.com/prabhupadasays/spsays-bff/internal/service"
 )
 
 // StatsHandler renders a single-page HTML snapshot of the system —
@@ -13,13 +16,18 @@ import (
 // (outside /api/v1, since it returns HTML not JSON) and intentionally
 // public per current product call. If that ever needs to change, wrap
 // the route in middleware in server.go.
+//
+// It also handles the "Mark resolved" form POST per feedback row, which
+// stamps resolved_at (one-way) and fires the author thank-you email via
+// the feedback service.
 type StatsHandler struct {
 	stats    *repository.StatsRepo
 	feedback *repository.FeedbackRepo
+	svc      *service.FeedbackService
 }
 
-func NewStatsHandler(stats *repository.StatsRepo, feedback *repository.FeedbackRepo) *StatsHandler {
-	return &StatsHandler{stats: stats, feedback: feedback}
+func NewStatsHandler(stats *repository.StatsRepo, feedback *repository.FeedbackRepo, svc *service.FeedbackService) *StatsHandler {
+	return &StatsHandler{stats: stats, feedback: feedback, svc: svc}
 }
 
 func (h *StatsHandler) Render(w http.ResponseWriter, r *http.Request) {
@@ -47,6 +55,20 @@ func (h *StatsHandler) Render(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// ResolveFeedback handles the per-row "Mark resolved" form POST. It marks
+// the row resolved (one-way) and fires the author thank-you email, then
+// 303-redirects back to /stats so a refresh doesn't re-submit. Already-
+// resolved or unknown ids redirect silently — the desired end state is
+// already true.
+func (h *StatsHandler) ResolveFeedback(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	if err := h.svc.Resolve(r.Context(), id); err != nil && !errors.Is(err, service.ErrAlreadyResolved) {
+		http.Error(w, "resolve failed: "+err.Error(), http.StatusInternalServerError)
+		return
+	}
+	http.Redirect(w, r, "/stats", http.StatusSeeOther)
+}
+
 var statsTpl = template.Must(template.New("stats").Funcs(template.FuncMap{
 	"fmtTime": func(t time.Time) string { return t.Format("2006-01-02 15:04") },
 }).Parse(statsHTML))
@@ -72,10 +94,15 @@ h2 { font-size: 1.05rem; margin-top: 2rem; margin-bottom: 0.5rem; border-bottom:
 .row:last-child { border-bottom: 0 }
 .row .cat { font-weight: 600; text-transform: capitalize }
 .fb { background: #fafafa; border: 1px solid #ececec; border-radius: 8px; padding: 0.9rem 1rem; margin-bottom: 0.6rem }
-.fb .head { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.82rem; color: #666; margin-bottom: 0.4rem; flex-wrap: wrap }
+.fb.resolved { background: #f3f8f4; border-color: #d6e9da }
+.fb .head { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.82rem; color: #666; margin-bottom: 0.4rem; flex-wrap: wrap; align-items: center }
 .fb .cat-pill { font-weight: 700; text-transform: capitalize; color: #1a1a1a }
 .fb .msg { white-space: pre-wrap; font-size: 0.95rem }
 .fb .author { font-size: 0.78rem; color: #888; margin-top: 0.5rem }
+.fb .foot { display: flex; justify-content: flex-end; margin-top: 0.6rem }
+.resolved-badge { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.78rem; font-weight: 600; color: #1e7a4a }
+.resolve-btn { font: inherit; font-size: 0.8rem; font-weight: 600; color: #fff; background: #1e7a4a; border: 0; border-radius: 6px; padding: 0.4rem 0.85rem; cursor: pointer }
+.resolve-btn:hover { background: #196b40 }
 code { background: #f4f4f4; padding: 0.05em 0.3em; border-radius: 3px; font-size: 0.85em }
 .empty { color: #888; font-style: italic }
 </style>
@@ -106,7 +133,7 @@ code { background: #f4f4f4; padding: 0.05em 0.3em; border-radius: 3px; font-size
 <h2>Recent feedback</h2>
 {{if .Feedback}}
   {{range .Feedback}}
-    <div class="fb">
+    <div class="fb{{if .ResolvedAt}} resolved{{end}}">
       <div class="head">
         <span class="cat-pill">{{.Category}}</span>
         <span>{{fmtTime .CreatedAt}}</span>
@@ -121,6 +148,15 @@ code { background: #f4f4f4; padding: 0.05em 0.3em; border-radius: 3px; font-size
           anonymous
         {{end}}
       </div>
+      <div class="foot">
+        {{if .ResolvedAt}}
+          <span class="resolved-badge">✓ Resolved {{fmtTime .ResolvedAt}}</span>
+        {{else}}
+          <form method="post" action="/stats/feedback/{{.ID}}/resolve" onsubmit="return confirm('Mark this feedback as resolved? This cannot be undone, and the author will be emailed.');">
+            <button type="submit" class="resolve-btn">Mark resolved</button>
+          </form>
+        {{end}}
+      </div>
     </div>
   {{end}}
 {{else}}

internal/model/feedback.go

@@ -21,6 +21,11 @@ type Feedback struct {
 	Message      string     `json:"message"`
 	ContactEmail *string    `json:"contact_email,omitempty"`
 	CreatedAt    time.Time  `json:"created_at"`
+	// ResolvedAt is set the moment an admin presses "Mark resolved" on
+	// the /stats page. NULL while open. The action is one-way — the
+	// repo's MarkResolved guards on `resolved_at IS NULL` so a second
+	// resolve is a no-op.
+	ResolvedAt   *time.Time `json:"resolved_at,omitempty"`
 
 	AuthorHandle *string `json:"author_handle,omitempty"`
 	AuthorName   *string `json:"author_name,omitempty"`

internal/repository/feedback_repo.go

@@ -32,16 +32,17 @@ func (r *FeedbackRepo) Create(ctx context.Context, userID *string, category, mes
 
 // FindByID returns one feedback row joined with the submitter's
 // handle + name + email if a user_id is present. Used after Create to
-// assemble the admin notification email with the proper author block.
+// assemble the admin notification email with the proper author block,
+// and after MarkResolved to assemble the author thank-you email.
 func (r *FeedbackRepo) FindByID(ctx context.Context, id string) (*model.Feedback, error) {
 	f := &model.Feedback{}
 	err := r.pg.Pool.QueryRow(ctx, `
-		SELECT f.id, f.user_id, f.category, f.message, f.contact_email, f.created_at,
+		SELECT f.id, f.user_id, f.category, f.message, f.contact_email, f.created_at, f.resolved_at,
 		       u.handle, u.name, u.email
 		FROM feedback f
 		LEFT JOIN users u ON u.id = f.user_id
 		WHERE f.id = $1`, id,
-	).Scan(&f.ID, &f.UserID, &f.Category, &f.Message, &f.ContactEmail, &f.CreatedAt,
+	).Scan(&f.ID, &f.UserID, &f.Category, &f.Message, &f.ContactEmail, &f.CreatedAt, &f.ResolvedAt,
 		&f.AuthorHandle, &f.AuthorName, &f.AuthorEmail)
 	if err != nil {
 		return nil, fmt.Errorf("find feedback: %w", err)
@@ -49,6 +50,23 @@ func (r *FeedbackRepo) FindByID(ctx context.Context, id string) (*model.Feedback
 	return f, nil
 }
 
+// MarkResolved stamps resolved_at = now() on a still-open row. The
+// `resolved_at IS NULL` guard makes this idempotent and one-way: the
+// first call returns true (newly resolved), any subsequent call — or a
+// call on an unknown id — returns false so the caller knows NOT to fire
+// the thank-you email a second time.
+func (r *FeedbackRepo) MarkResolved(ctx context.Context, id string) (resolved bool, err error) {
+	tag, err := r.pg.Pool.Exec(ctx, `
+		UPDATE feedback
+		SET resolved_at = now()
+		WHERE id = $1 AND resolved_at IS NULL`, id,
+	)
+	if err != nil {
+		return false, fmt.Errorf("mark feedback resolved: %w", err)
+	}
+	return tag.RowsAffected() == 1, nil
+}
+
 // Recent returns the most-recent N feedback rows joined with users
 // for display on /stats. NULL author columns mean anonymous (or the
 // original submitter's account was since deleted).
@@ -57,7 +75,7 @@ func (r *FeedbackRepo) Recent(ctx context.Context, limit int) ([]model.Feedback,
 		limit = 25
 	}
 	rows, err := r.pg.Pool.Query(ctx, `
-		SELECT f.id, f.user_id, f.category, f.message, f.contact_email, f.created_at,
+		SELECT f.id, f.user_id, f.category, f.message, f.contact_email, f.created_at, f.resolved_at,
 		       u.handle, u.name
 		FROM feedback f
 		LEFT JOIN users u ON u.id = f.user_id
@@ -71,7 +89,7 @@ func (r *FeedbackRepo) Recent(ctx context.Context, limit int) ([]model.Feedback,
 	out := []model.Feedback{}
 	for rows.Next() {
 		var f model.Feedback
-		if err := rows.Scan(&f.ID, &f.UserID, &f.Category, &f.Message, &f.ContactEmail, &f.CreatedAt,
+		if err := rows.Scan(&f.ID, &f.UserID, &f.Category, &f.Message, &f.ContactEmail, &f.CreatedAt, &f.ResolvedAt,
 			&f.AuthorHandle, &f.AuthorName); err != nil {
 			return nil, fmt.Errorf("scan feedback: %w", err)
 		}

internal/server/server.go

@@ -195,7 +195,7 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	statsRepo := repository.NewStatsRepo(s.pg)
 	feedbackSvc := service.NewFeedbackService(feedbackRepo, mail, cfg.FeedbackAdminEmails, logger)
 	s.feedbackH = handler.NewFeedbackHandler(feedbackSvc)
-	s.statsH = handler.NewStatsHandler(statsRepo, feedbackRepo)
+	s.statsH = handler.NewStatsHandler(statsRepo, feedbackRepo, feedbackSvc)
 }
 
 // initShortener wires Postgres + Redis + the shorturl handler/workers.
@@ -314,6 +314,10 @@ func (s *Server) setupRouter() {
 	// ever needs to change.
 	if s.statsH != nil {
 		r.Get("/stats", s.statsH.Render)
+		// One-way "mark resolved" per feedback row — POST so a refresh of
+		// /stats can't replay it, and it lives at the same public access
+		// level as /stats itself (gate both together if that changes).
+		r.Post("/stats/feedback/{id}/resolve", s.statsH.ResolveFeedback)
 	}
 
 	// API v1

internal/service/feedback_service.go

@@ -92,6 +92,70 @@ func (s *FeedbackService) Submit(ctx context.Context, userID *string, category,
 	return f, nil
 }
 
+// ErrAlreadyResolved is returned by Resolve when the row was already
+// closed (or doesn't exist). The handler maps it to a benign redirect
+// rather than an error — the end state the admin wanted is already true.
+var ErrAlreadyResolved = errors.New("feedback already resolved")
+
+// Resolve marks a feedback row resolved (one-way) and, if a recipient
+// address is known, sends the author a Vaishnava-styled thank-you note.
+//
+// The DB update is the source of truth: MarkResolved's `resolved_at IS
+// NULL` guard guarantees the email fires at most once even under
+// concurrent button presses. The email is fire-and-forget — a send
+// failure logs but doesn't un-resolve the row.
+func (s *FeedbackService) Resolve(ctx context.Context, id string) error {
+	resolved, err := s.repo.MarkResolved(ctx, id)
+	if err != nil {
+		return err
+	}
+	if !resolved {
+		return ErrAlreadyResolved
+	}
+
+	// Re-read with author joins so we know where to send the thank-you.
+	f, err := s.repo.FindByID(ctx, id)
+	if err != nil {
+		// Row IS resolved; we just can't assemble the email. Log and
+		// succeed — the resolve itself stuck.
+		s.logger.Warn("feedback resolved but hydrate failed; skipping thank-you email",
+			zap.String("feedback_id", id), zap.Error(err))
+		return nil
+	}
+
+	to := feedbackReplyTo(f)
+	if to == "" {
+		// No email on file (anonymous submitter who left no contact, or
+		// a since-deleted account). Nothing to send — that's fine.
+		s.logger.Info("feedback resolved; no recipient address, skipping thank-you email",
+			zap.String("feedback_id", id))
+		return nil
+	}
+
+	body, err := renderFeedbackResolvedEmail(f)
+	if err != nil {
+		s.logger.Warn("render feedback-resolved email failed", zap.Error(err))
+		return nil
+	}
+	if err := s.mail.Send(to, "Your feedback has been addressed — Prabhupāda Says", body); err != nil {
+		s.logger.Warn("feedback-resolved email send failed",
+			zap.String("to", to), zap.Error(err))
+	}
+	return nil
+}
+
+// feedbackReplyTo picks the address to thank: the authed submitter's
+// account email if present, else the anonymous contact_email, else "".
+func feedbackReplyTo(f *model.Feedback) string {
+	if f.AuthorEmail != nil && strings.TrimSpace(*f.AuthorEmail) != "" {
+		return strings.TrimSpace(*f.AuthorEmail)
+	}
+	if f.ContactEmail != nil && strings.TrimSpace(*f.ContactEmail) != "" {
+		return strings.TrimSpace(*f.ContactEmail)
+	}
+	return ""
+}
+
 // notifyAdmins fires one HTML email per configured admin. Each
 // failure logs and falls through — the row is persisted so a missed
 // email is annoying but not data-losing.
@@ -165,3 +229,50 @@ func derefOr(p *string, fallback string) string {
 	}
 	return *p
 }
+
+// feedbackResolvedEmailTpl is the author-facing thank-you sent when an
+// admin marks their feedback resolved. Vaishnava-styled — warm,
+// devotional register, addressed to the submitter by name when known.
+var feedbackResolvedEmailTpl = template.Must(template.New("feedbackResolved").Parse(`<div style="font-family:Georgia,'Times New Roman',serif;color:#2a2118;max-width:560px;margin:0 auto;line-height:1.7">
+  <p style="font-size:15px;color:#9a6b2f;letter-spacing:0.04em;margin-bottom:1.25em">Hare Kṛṣṇa{{if .Name}}, {{.Name}}{{end}} 🙏</p>
+
+  <p>Please accept our humble obeisances. All glories to Śrīla Prabhupāda.</p>
+
+  <p>We are writing to let you know that the feedback you kindly shared with
+  us has been <strong>acknowledged and addressed</strong>. The necessary
+  features and fixes you pointed us toward have now been implemented.</p>
+
+  <p>Your observations help us serve Śrīla Prabhupāda's <em>vāṇī</em> more
+  faithfully, and we are sincerely grateful that you took the time to write.
+  Devotee feedback like yours is one of the ways this humble service keeps
+  improving.</p>
+
+  <p>We warmly invite you to continue using
+  <a href="https://prabhupadasays.org" style="color:#9a6b2f;font-weight:600">prabhupadasays.org</a>
+  with even greater enthusiasm — there is always more of Śrīla Prabhupāda's
+  nectar waiting to be relished.</p>
+
+  <p style="margin-top:1.75em">Your servants,<br>
+  <strong>The Prabhupāda Says team</strong></p>
+
+  <hr style="border:none;border-top:1px solid #e8ddc9;margin:2em 0">
+  <p style="font-size:12px;color:#a89878;font-style:italic">
+    “Books are the basis.” — His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda
+  </p>
+</div>`))
+
+func renderFeedbackResolvedEmail(f *model.Feedback) (string, error) {
+	// Prefer the account display name; fall back to no name (the
+	// template drops the comma cleanly when Name is empty).
+	name := ""
+	if f.AuthorName != nil {
+		name = strings.TrimSpace(*f.AuthorName)
+	}
+	var buf bytes.Buffer
+	if err := feedbackResolvedEmailTpl.Execute(&buf, map[string]any{
+		"Name": name,
+	}); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}

migrations/0017_add_feedback_resolved_at.down.sql

@@ -0,0 +1,2 @@
+DROP INDEX IF EXISTS idx_feedback_unresolved;
+ALTER TABLE feedback DROP COLUMN IF EXISTS resolved_at;

migrations/0017_add_feedback_resolved_at.up.sql

@@ -0,0 +1,19 @@
+-- Track when a feedback row was resolved.
+--
+-- NULL = still open. Non-NULL = closed at that moment. The action is
+-- one-way: the resolve endpoint enforces `WHERE resolved_at IS NULL` so
+-- a row already marked stays marked, and a subsequent re-resolve is a
+-- no-op (no new email goes out).
+--
+-- We don't store "who" resolved it because the /stats page surfaces
+-- this to the team and any audit-quality "who closed what" trail would
+-- want its own table — out of scope for now.
+ALTER TABLE feedback
+    ADD COLUMN IF NOT EXISTS resolved_at TIMESTAMPTZ;
+
+-- Partial index makes "give me the still-open feedback" cheap as the
+-- table grows. The /stats page lists newest-first regardless of state,
+-- so the existing created_at index still serves its read path.
+CREATE INDEX IF NOT EXISTS idx_feedback_unresolved
+    ON feedback (created_at DESC)
+    WHERE resolved_at IS NULL;