package dish

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

	"github.com/go-chi/chi/v5"
)

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

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

// List handles GET /dishes — returns all dishes (no recipe variants).
func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
	dishes, err := h.repo.List(r.Context())
	if err != nil {
		slog.Error("list dishes", "err", err)
		writeError(w, http.StatusInternalServerError, "failed to list dishes")
		return
	}
	if dishes == nil {
		dishes = []*Dish{}
	}
	writeJSON(w, http.StatusOK, map[string]any{"dishes": dishes})
}

// GetByID handles GET /dishes/{id} — returns a dish with all recipe variants.
func (h *Handler) GetByID(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	dish, err := h.repo.GetByID(r.Context(), id)
	if err != nil {
		slog.Error("get dish", "id", id, "err", err)
		writeError(w, http.StatusInternalServerError, "failed to get dish")
		return
	}
	if dish == nil {
		writeError(w, http.StatusNotFound, "dish not found")
		return
	}
	writeJSON(w, http.StatusOK, dish)
}

// --- helpers ---

type errorResponse struct {
	Error string `json:"error"`
}

func writeError(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)
}