feat: implement Iteration 1 — AI recipe recommendations
Backend:
- Add Groq LLM client (llama-3.3-70b) for recipe generation with JSON
retry strategy (retries only on parse errors, not API errors)
- Add Pexels client for parallel photo search per recipe
- Add saved_recipes table (migration 004) with JSONB fields
- Add GET /recommendations endpoint (profile-aware prompt building)
- Add POST/GET/GET{id}/DELETE /saved-recipes CRUD endpoints
- Wire gemini, pexels, recommendation, savedrecipe packages in main.go
Flutter:
- Add Recipe, SavedRecipe models with json_serializable
- Add RecipeService (getRecommendations, getSavedRecipes, save, delete)
- Add RecommendationsNotifier and SavedRecipesNotifier (Riverpod)
- Add RecommendationsScreen with skeleton loading and refresh FAB
- Add RecipeDetailScreen (SliverAppBar, nutrition tooltip, steps with timer)
- Add SavedRecipesScreen with Dismissible swipe-to-delete and empty state
- Update RecipesScreen to TabBar (Recommendations / Saved)
- Add /recipe-detail route outside ShellRoute (no bottom nav)
- Extend ApiClient with getList() and deleteVoid()
Project:
- Add CLAUDE.md with English-only rule for comments and commit messages
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
dbastrikin
186
backend/internal/gemini/recipe.go
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186
backend/internal/gemini/recipe.go
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package gemini
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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)
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// RecipeGenerator generates recipes using the Gemini AI.
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type RecipeGenerator interface {
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GenerateRecipes(ctx context.Context, req RecipeRequest) ([]Recipe, error)
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}
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// RecipeRequest contains parameters for recipe generation.
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type RecipeRequest struct {
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UserGoal string // "weight_loss" | "maintain" | "gain"
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DailyCalories int
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Restrictions []string // e.g. ["gluten_free", "vegetarian"]
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CuisinePrefs []string // e.g. ["russian", "asian"]
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Count int
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}
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// Recipe is a recipe returned by Gemini.
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type Recipe struct {
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Title string `json:"title"`
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Description string `json:"description"`
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Cuisine string `json:"cuisine"`
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Difficulty string `json:"difficulty"`
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PrepTimeMin int `json:"prep_time_min"`
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CookTimeMin int `json:"cook_time_min"`
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Servings int `json:"servings"`
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ImageQuery string `json:"image_query"`
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ImageURL string `json:"image_url"`
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Ingredients []Ingredient `json:"ingredients"`
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Steps []Step `json:"steps"`
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Tags []string `json:"tags"`
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Nutrition NutritionInfo `json:"nutrition_per_serving"`
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}
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// Ingredient is a single ingredient in a recipe.
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type Ingredient struct {
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Name string `json:"name"`
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Amount float64 `json:"amount"`
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Unit string `json:"unit"`
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}
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// Step is a single preparation step.
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type Step struct {
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Number int `json:"number"`
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Description string `json:"description"`
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TimerSeconds *int `json:"timer_seconds"`
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}
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// NutritionInfo contains approximate nutritional information per serving.
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type NutritionInfo struct {
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Calories float64 `json:"calories"`
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ProteinG float64 `json:"protein_g"`
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FatG float64 `json:"fat_g"`
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CarbsG float64 `json:"carbs_g"`
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Approximate bool `json:"approximate"`
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}
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// GenerateRecipes generates recipes using the Gemini AI.
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// Retries up to maxRetries times only when the response is not valid JSON.
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// API-level errors (rate limits, auth, etc.) are returned immediately.
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func (c *Client) GenerateRecipes(ctx context.Context, req RecipeRequest) ([]Recipe, error) {
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prompt := buildRecipePrompt(req)
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// OpenAI-compatible messages format used by Groq.
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messages := []map[string]string{
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{"role": "user", "content": prompt},
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}
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var lastErr error
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for attempt := 0; attempt < maxRetries; attempt++ {
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if attempt > 0 {
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messages = []map[string]string{
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{"role": "user", "content": prompt},
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{"role": "user", "content": "Предыдущий ответ не был валидным JSON. Верни ТОЛЬКО массив JSON без какого-либо текста до или после."},
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}
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}
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text, err := c.generateContent(ctx, messages)
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if err != nil {
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// API-level error (4xx/5xx): no point retrying immediately.
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return nil, err
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}
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recipes, err := parseRecipesJSON(text)
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if err != nil {
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// Malformed JSON from the model — retry with a clarifying message.
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lastErr = fmt.Errorf("attempt %d parse JSON: %w", attempt+1, err)
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continue
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}
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for i := range recipes {
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recipes[i].Nutrition.Approximate = true
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}
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return recipes, nil
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}
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return nil, fmt.Errorf("failed to parse valid JSON after %d attempts: %w", maxRetries, lastErr)
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}
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func buildRecipePrompt(req RecipeRequest) string {
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goalRu := map[string]string{
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"weight_loss": "похудение",
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"maintain": "поддержание веса",
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"gain": "набор массы",
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}
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goal := goalRu[req.UserGoal]
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if goal == "" {
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goal = "поддержание веса"
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}
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restrictions := "нет"
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if len(req.Restrictions) > 0 {
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restrictions = strings.Join(req.Restrictions, ", ")
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}
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cuisines := "любые"
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if len(req.CuisinePrefs) > 0 {
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cuisines = strings.Join(req.CuisinePrefs, ", ")
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}
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count := req.Count
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if count <= 0 {
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count = 5
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}
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perMealCalories := req.DailyCalories / 3
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if perMealCalories <= 0 {
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perMealCalories = 600
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}
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return fmt.Sprintf(`Ты — диетолог-повар. Предложи %d рецептов на русском языке.
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Профиль пользователя:
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- Цель: %s
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- Дневная норма калорий: %d ккал
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- Ограничения: %s
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- Предпочтения: %s
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Требования к каждому рецепту:
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- Калорийность на порцию: не более %d ккал
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- Время приготовления: до 60 минут
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- Укажи КБЖУ на порцию (приблизительно)
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ВАЖНО: поле image_query заполняй ТОЛЬКО на английском языке — оно используется для поиска фото.
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Верни ТОЛЬКО валидный JSON-массив без markdown-обёртки:
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[{
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"title": "Название",
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"description": "2-3 предложения",
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"cuisine": "russian|asian|european|mediterranean|american|other",
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"difficulty": "easy|medium|hard",
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"prep_time_min": 10,
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"cook_time_min": 20,
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"servings": 2,
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"image_query": "chicken breast vegetables healthy (ENGLISH ONLY, used for photo search)",
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"ingredients": [{"name": "Куриная грудка", "amount": 300, "unit": "г"}],
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"steps": [{"number": 1, "description": "...", "timer_seconds": null}],
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"tags": ["высокий белок"],
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"nutrition_per_serving": {
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"calories": 420, "protein_g": 48, "fat_g": 12, "carbs_g": 18
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}
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}]`, count, goal, req.DailyCalories, restrictions, cuisines, perMealCalories)
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}
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func parseRecipesJSON(text string) ([]Recipe, error) {
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text = strings.TrimSpace(text)
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// Strip potential markdown code fences
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if strings.HasPrefix(text, "```") {
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text = strings.TrimPrefix(text, "```json")
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text = strings.TrimPrefix(text, "```")
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text = strings.TrimSuffix(text, "```")
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text = strings.TrimSpace(text)
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}
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var recipes []Recipe
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if err := json.Unmarshal([]byte(text), &recipes); err != nil {
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return nil, err
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}
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return recipes, nil
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}
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