package ingredient

import (
	"encoding/json"
	"log/slog"
	"net/http"
	"strconv"
)

// Handler handles ingredient HTTP requests.
type Handler struct {
	repo *Repository
}

// NewHandler creates a new Handler.
func NewHandler(repo *Repository) *Handler {
	return &Handler{repo: repo}
}

// Search handles GET /ingredients/search?q=&limit=10.
func (h *Handler) Search(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query().Get("q")
	if q == "" {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte("[]"))
		return
	}

	limit := 10
	if s := r.URL.Query().Get("limit"); s != "" {
		if n, err := strconv.Atoi(s); err == nil && n > 0 && n <= 50 {
			limit = n
		}
	}

	mappings, err := h.repo.Search(r.Context(), q, limit)
	if err != nil {
		slog.Error("search ingredients", "q", q, "err", err)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		_, _ = w.Write([]byte(`{"error":"search failed"}`))
		return
	}

	if mappings == nil {
		mappings = []*IngredientMapping{}
	}

	w.Header().Set("Content-Type", "application/json")
	_ = json.NewEncoder(w).Encode(mappings)
}