package view

import (
	"net/http"
	"sort"

	"xengineering.eu/ceres/model"
)

func RecipeRead(db *model.DB) http.Handler {
	return http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			var data struct {
				Recipe         model.Recipe
				HasIngredients bool
				Summary        []model.Ingredient
			}

			data.Recipe.Id = r.PathValue("id")

			var obj model.Object = &data.Recipe
			err := db.Transaction(obj.Read)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}

			data.HasIngredients = false
			for _, step := range data.Recipe.Steps {
				if len(step.Ingredients) > 0 {
					data.HasIngredients = true
				}
				for _, ingredient := range step.Ingredients {
					data.Summary = append(data.Summary, ingredient)
				}
			}

			sort.Slice(data.Summary, func(i, j int) bool {
				return data.Summary[i].Type < data.Summary[j].Type
			})

			template := "recipe"
			view, ok := r.URL.Query()["view"]
			if ok {
				if len(view) > 1 {
					http.Error(w, "More than one 'view' parameter given in URL", http.StatusBadRequest)
					return
				}
				template = view[0]
			}

			is_valid := false
			valid_templates := []string{
				"recipe",
				"recipe-edit",
				"recipe-confirm-deletion",
			}
			for _, v := range valid_templates {
				if template == v {
					is_valid = true
				}
			}
			if !is_valid {
				http.Error(w, "Unsupported view: "+template, http.StatusBadRequest)
				return
			}

			err = html.ExecuteTemplate(w, template, data)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
		},
	)
}

func RecipeCreate() http.Handler {
	return http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			var data struct {
				Recipe model.Recipe
			}

			err := html.ExecuteTemplate(w, "recipe-edit", data)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
		},
	)
}