feat: implement Iteration 2 — product management

Backend: - migrations/005: add pg_trgm extension + search indexes on ingredient_mappings - migrations/006: products table with computed expires_at column - ingredient: add Search method (aliases + ILIKE + trgm) + HTTP handler - product: full package — model, repository (CRUD + BatchCreate + ListForPrompt), handler - gemini: add AvailableProducts field to RecipeRequest, include in prompt - recommendation: add ProductLister interface, load user products for personalised prompts - server/main: wire ingredient and product handlers with new routes Flutter: - models: Product, IngredientMapping with json_serializable - ProductService: getProducts, createProduct, updateProduct, deleteProduct, searchIngredients - ProductsNotifier: create/update/delete with optimistic delete - ProductsScreen: expiring-soon section, normal section, swipe-to-delete, edit bottom sheet - AddProductScreen: name field with 300ms debounce autocomplete, qty/unit/days fields - app_router: /products/add route + Badge on Products nav tab showing expiring count - MainShell converted to ConsumerWidget for badge reactivity Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-02-21 23:22:30 +02:00
parent 0dbda0cd57
commit b9b9e9fe11
20 changed files with 1585 additions and 32 deletions
--- a/backend/internal/product/handler.go
+++ b/backend/internal/product/handler.go
@@ -0,0 +1,137 @@
+package product
+
+import (
+	"encoding/json"
+	"errors"
+	"log/slog"
+	"net/http"
+
+	"github.com/food-ai/backend/internal/middleware"
+	"github.com/go-chi/chi/v5"
+)
+
+// Handler handles /products HTTP requests.
+type Handler struct {
+	repo *Repository
+}
+
+// NewHandler creates a new Handler.
+func NewHandler(repo *Repository) *Handler {
+	return &Handler{repo: repo}
+}
+
+// List handles GET /products.
+func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.UserIDFromCtx(r.Context())
+	products, err := h.repo.List(r.Context(), userID)
+	if err != nil {
+		slog.Error("list products", "user_id", userID, "err", err)
+		writeErrorJSON(w, http.StatusInternalServerError, "failed to list products")
+		return
+	}
+	if products == nil {
+		products = []*Product{}
+	}
+	writeJSON(w, http.StatusOK, products)
+}
+
+// Create handles POST /products.
+func (h *Handler) Create(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.UserIDFromCtx(r.Context())
+	var req CreateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeErrorJSON(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+	if req.Name == "" {
+		writeErrorJSON(w, http.StatusBadRequest, "name is required")
+		return
+	}
+
+	p, err := h.repo.Create(r.Context(), userID, req)
+	if err != nil {
+		slog.Error("create product", "user_id", userID, "err", err)
+		writeErrorJSON(w, http.StatusInternalServerError, "failed to create product")
+		return
+	}
+	writeJSON(w, http.StatusCreated, p)
+}
+
+// BatchCreate handles POST /products/batch.
+func (h *Handler) BatchCreate(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.UserIDFromCtx(r.Context())
+	var items []CreateRequest
+	if err := json.NewDecoder(r.Body).Decode(&items); err != nil {
+		writeErrorJSON(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+	if len(items) == 0 {
+		writeJSON(w, http.StatusCreated, []*Product{})
+		return
+	}
+
+	products, err := h.repo.BatchCreate(r.Context(), userID, items)
+	if err != nil {
+		slog.Error("batch create products", "user_id", userID, "err", err)
+		writeErrorJSON(w, http.StatusInternalServerError, "failed to create products")
+		return
+	}
+	writeJSON(w, http.StatusCreated, products)
+}
+
+// Update handles PUT /products/{id}.
+func (h *Handler) Update(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.UserIDFromCtx(r.Context())
+	id := chi.URLParam(r, "id")
+
+	var req UpdateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeErrorJSON(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+
+	p, err := h.repo.Update(r.Context(), id, userID, req)
+	if errors.Is(err, ErrNotFound) {
+		writeErrorJSON(w, http.StatusNotFound, "product not found")
+		return
+	}
+	if err != nil {
+		slog.Error("update product", "id", id, "err", err)
+		writeErrorJSON(w, http.StatusInternalServerError, "failed to update product")
+		return
+	}
+	writeJSON(w, http.StatusOK, p)
+}
+
+// Delete handles DELETE /products/{id}.
+func (h *Handler) Delete(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.UserIDFromCtx(r.Context())
+	id := chi.URLParam(r, "id")
+
+	if err := h.repo.Delete(r.Context(), id, userID); err != nil {
+		if errors.Is(err, ErrNotFound) {
+			writeErrorJSON(w, http.StatusNotFound, "product not found")
+			return
+		}
+		slog.Error("delete product", "id", id, "err", err)
+		writeErrorJSON(w, http.StatusInternalServerError, "failed to delete product")
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+type errorResponse struct {
+	Error string `json:"error"`
+}
+
+func writeErrorJSON(w http.ResponseWriter, status int, msg string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(errorResponse{Error: msg})
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
--- a/backend/internal/product/model.go
+++ b/backend/internal/product/model.go
@@ -0,0 +1,39 @@
+package product
+
+import "time"
+
+// Product is a user's food item in their pantry.
+type Product struct {
+	ID           string    `json:"id"`
+	UserID       string    `json:"user_id"`
+	MappingID    *string   `json:"mapping_id"`
+	Name         string    `json:"name"`
+	Quantity     float64   `json:"quantity"`
+	Unit         string    `json:"unit"`
+	Category     *string   `json:"category"`
+	StorageDays  int       `json:"storage_days"`
+	AddedAt      time.Time `json:"added_at"`
+	ExpiresAt    time.Time `json:"expires_at"`
+	DaysLeft     int       `json:"days_left"`
+	ExpiringSoon bool      `json:"expiring_soon"`
+}
+
+// CreateRequest is the body for POST /products.
+type CreateRequest struct {
+	MappingID   *string  `json:"mapping_id"`
+	Name        string   `json:"name"`
+	Quantity    float64  `json:"quantity"`
+	Unit        string   `json:"unit"`
+	Category    *string  `json:"category"`
+	StorageDays int      `json:"storage_days"`
+}
+
+// UpdateRequest is the body for PUT /products/{id}.
+// All fields are optional (nil = keep existing value).
+type UpdateRequest struct {
+	Name        *string  `json:"name"`
+	Quantity    *float64 `json:"quantity"`
+	Unit        *string  `json:"unit"`
+	Category    *string  `json:"category"`
+	StorageDays *int     `json:"storage_days"`
+}
--- a/backend/internal/product/repository.go
+++ b/backend/internal/product/repository.go
@@ -0,0 +1,188 @@
+package product
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// ErrNotFound is returned when a product is not found or does not belong to the user.
+var ErrNotFound = errors.New("product not found")
+
+// Repository handles product persistence.
+type Repository struct {
+	pool *pgxpool.Pool
+}
+
+// NewRepository creates a new Repository.
+func NewRepository(pool *pgxpool.Pool) *Repository {
+	return &Repository{pool: pool}
+}
+
+const selectCols = `id, user_id, mapping_id, name, quantity, unit, category, storage_days, added_at, expires_at`
+
+// List returns all products for a user, sorted by expires_at ASC.
+func (r *Repository) List(ctx context.Context, userID string) ([]*Product, error) {
+	rows, err := r.pool.Query(ctx, `
+		SELECT `+selectCols+`
+		FROM products
+		WHERE user_id = $1
+		ORDER BY expires_at ASC`, userID)
+	if err != nil {
+		return nil, fmt.Errorf("list products: %w", err)
+	}
+	defer rows.Close()
+	return collectProducts(rows)
+}
+
+// Create inserts a new product and returns the created record.
+func (r *Repository) Create(ctx context.Context, userID string, req CreateRequest) (*Product, error) {
+	storageDays := req.StorageDays
+	if storageDays <= 0 {
+		storageDays = 7
+	}
+	unit := req.Unit
+	if unit == "" {
+		unit = "pcs"
+	}
+	qty := req.Quantity
+	if qty <= 0 {
+		qty = 1
+	}
+
+	row := r.pool.QueryRow(ctx, `
+		INSERT INTO products (user_id, mapping_id, name, quantity, unit, category, storage_days)
+		VALUES ($1, $2, $3, $4, $5, $6, $7)
+		RETURNING `+selectCols,
+		userID, req.MappingID, req.Name, qty, unit, req.Category, storageDays,
+	)
+	return scanProduct(row)
+}
+
+// BatchCreate inserts multiple products sequentially and returns all created records.
+func (r *Repository) BatchCreate(ctx context.Context, userID string, items []CreateRequest) ([]*Product, error) {
+	var result []*Product
+	for _, req := range items {
+		p, err := r.Create(ctx, userID, req)
+		if err != nil {
+			return nil, fmt.Errorf("batch create product %q: %w", req.Name, err)
+		}
+		result = append(result, p)
+	}
+	return result, nil
+}
+
+// Update modifies an existing product. Only non-nil fields are changed.
+// Returns ErrNotFound if the product does not exist or belongs to a different user.
+func (r *Repository) Update(ctx context.Context, id, userID string, req UpdateRequest) (*Product, error) {
+	row := r.pool.QueryRow(ctx, `
+		UPDATE products SET
+			name         = COALESCE($3, name),
+			quantity     = COALESCE($4, quantity),
+			unit         = COALESCE($5, unit),
+			category     = COALESCE($6, category),
+			storage_days = COALESCE($7, storage_days)
+		WHERE id = $1 AND user_id = $2
+		RETURNING `+selectCols,
+		id, userID, req.Name, req.Quantity, req.Unit, req.Category, req.StorageDays,
+	)
+	p, err := scanProduct(row)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	return p, err
+}
+
+// Delete removes a product. Returns ErrNotFound if it does not exist or belongs to a different user.
+func (r *Repository) Delete(ctx context.Context, id, userID string) error {
+	tag, err := r.pool.Exec(ctx,
+		`DELETE FROM products WHERE id = $1 AND user_id = $2`, id, userID)
+	if err != nil {
+		return fmt.Errorf("delete product: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return ErrNotFound
+	}
+	return nil
+}
+
+// ListForPrompt returns a human-readable list of user's products for the AI prompt.
+// Expiring soon items are marked with ⚠.
+func (r *Repository) ListForPrompt(ctx context.Context, userID string) ([]string, error) {
+	rows, err := r.pool.Query(ctx, `
+		SELECT name, quantity, unit, expires_at
+		FROM products
+		WHERE user_id = $1
+		ORDER BY expires_at ASC`, userID)
+	if err != nil {
+		return nil, fmt.Errorf("list products for prompt: %w", err)
+	}
+	defer rows.Close()
+
+	var lines []string
+	now := time.Now()
+	for rows.Next() {
+		var name, unit string
+		var qty float64
+		var expiresAt time.Time
+		if err := rows.Scan(&name, &qty, &unit, &expiresAt); err != nil {
+			return nil, fmt.Errorf("scan product for prompt: %w", err)
+		}
+		daysLeft := int(expiresAt.Sub(now).Hours() / 24)
+		line := fmt.Sprintf("- %s %.0f %s", name, qty, unit)
+		switch {
+		case daysLeft <= 0:
+			line += " (истекает сегодня ⚠)"
+		case daysLeft == 1:
+			line += " (истекает завтра ⚠)"
+		case daysLeft <= 3:
+			line += fmt.Sprintf(" (истекает через %d дня ⚠)", daysLeft)
+		}
+		lines = append(lines, line)
+	}
+	return lines, rows.Err()
+}
+
+// --- helpers ---
+
+func scanProduct(row pgx.Row) (*Product, error) {
+	var p Product
+	err := row.Scan(
+		&p.ID, &p.UserID, &p.MappingID, &p.Name, &p.Quantity, &p.Unit,
+		&p.Category, &p.StorageDays, &p.AddedAt, &p.ExpiresAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+	computeDaysLeft(&p)
+	return &p, nil
+}
+
+func collectProducts(rows pgx.Rows) ([]*Product, error) {
+	var result []*Product
+	for rows.Next() {
+		var p Product
+		if err := rows.Scan(
+			&p.ID, &p.UserID, &p.MappingID, &p.Name, &p.Quantity, &p.Unit,
+			&p.Category, &p.StorageDays, &p.AddedAt, &p.ExpiresAt,
+		); err != nil {
+			return nil, fmt.Errorf("scan product: %w", err)
+		}
+		computeDaysLeft(&p)
+		result = append(result, &p)
+	}
+	return result, rows.Err()
+}
+
+func computeDaysLeft(p *Product) {
+	d := int(time.Until(p.ExpiresAt).Hours() / 24)
+	if d < 0 {
+		d = 0
+	}
+	p.DaysLeft = d
+	p.ExpiringSoon = d <= 3
+}