recipes2/internal/http-server/handlers/recipesByCategory/recipesByCategory.go

package recipes_by_category

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"recipes/internal/domain/models"
	resp "recipes/internal/lib/api/response"
	"recipes/internal/lib/logger/sl"
	"recipes/internal/storage"

	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/render"
	"github.com/go-playground/validator/v10"
)

type Request struct {
	Page     uint   `json:"page" validate:"required,gt=0"`
	Category string `json:"category" validate:"required"`
}

type Response struct {
	resp.Response
	Recipes []models.Recipe `json:"recipes"`
}

//go:generate go run github.com/vektra/mockery/v2@v2.40.1 --name=RecipesProvider
type RecipesProvider interface {
	GetRecipesByCategory(ctx context.Context, offset, limit int, category string) ([]models.Recipe, error)
}

const GetRecipesLimit int = 16

func New(log *slog.Logger, recipesProvider RecipesProvider) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		const op = "http-server.handlers.recipesByCategory.New"

		log := log.With(
			slog.String("op", op),
			slog.String("request_id", middleware.GetReqID(r.Context())),
		)

		var req Request
		// decode request
		err := render.DecodeJSON(r.Body, &req)
		if err != nil {
			log.Error("failed to decode request body", sl.Err(err))
			render.JSON(w, r, resp.Error("failed to decode request"))
			return
		}
		log.Debug("request body decoded", slog.Any("request", req))
		// validate request
		if err := validator.New().Struct(req); err != nil {
			validateErr := err.(validator.ValidationErrors)

			log.Error("invalid request", sl.Err(err))
			render.JSON(w, r, resp.ValidationError(validateErr))
			return
		}
		// get recipes from storage
		recipes, err := recipesProvider.GetRecipesByCategory(r.Context(), GetRecipesLimit*(int(req.Page)-1), GetRecipesLimit, req.Category)
		if err != nil {
			if errors.Is(err, storage.ErrCategoryNotFound) {
				log.Error("failed to get recipes by category from storage", sl.Err(err))
				render.JSON(w, r, resp.Error("category not found"))
				return
			}
			log.Error("failed to get recipes from storage", sl.Err(err))
			render.JSON(w, r, resp.Error("failed to get recipes"))
			return
		}
		// return
		render.JSON(w, r, Response{
			Response: resp.OK(),
			Recipes:  recipes,
		})
	}
}