package recipes

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

	"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"`
}

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

type RecipeProvider interface {
	GetRecipes(ctx context.Context, offset, limit int) ([]models.Recipe, error)
}

const getRecipesLimit int = 16

func New(log *slog.Logger, recipeProvider RecipeProvider) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		const op = "http-server.handlers.recipes.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 from storage
		recipes, err := recipeProvider.GetRecipes(r.Context(), getRecipesLimit*(int(req.Page)-1), getRecipesLimit)
		if err != nil {
			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,
		})
	}
}