package upload

import (
	"fmt"
	"net/http"

	"github.com/rs/zerolog/log"

	"librapi/forms"
	"librapi/services"
	"librapi/templates"
)

const (
	URL = "/upload"
)

func Handler(a services.IAuthenticate, s services.IStore) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case http.MethodGet:
			getUploadFile(w, r)
		case http.MethodPost:
			postUploadFile(w, r, a, s)
		default:
			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		}
	}
}

func postUploadFile(w http.ResponseWriter, r *http.Request, a services.IAuthenticate, s services.IStore) {
	if !a.IsLogged(r) {
		tmpl, err := templates.ExecuteUploadFormTmpl(&forms.UploadForm{Error: services.ErrUnauthorized.Error()}, w)
		if err != nil {
			log.Err(err).Msg("unable to generate upload template")
			return
		}

		w.WriteHeader(http.StatusUnauthorized)
		fmt.Fprint(w, tmpl)
		return
	}

	uf := forms.UploadFormFromRequest(r)
	tmpl, err := templates.ExecuteUploadFormTmpl(&uf, w)
	if err != nil {
		log.Err(err).Msg("unable to generate upload template")
		return
	}

	if uf.HasErrors() {
		w.WriteHeader(http.StatusBadRequest)
		fmt.Fprint(w, tmpl)
		return
	}

	filename := uf.File.Value.GetFilename()
	log.Info().Str("filename", filename).Msg("file uploaded")

	resource := uf.IntoResource()

	if err := s.Create(resource); err != nil {
		uf.Error = err.Error()

		tmpl, err := templates.ExecuteUploadFormTmpl(&uf, w)
		if err != nil {
			log.Err(err).Msg("unable to generate upload template")
			return
		}

		w.WriteHeader(http.StatusInternalServerError)
		fmt.Fprint(w, tmpl)
		return
	}

	tmpl, err = templates.ExecuteUploadFormTmpl(&forms.UploadForm{Method: http.MethodPost}, w)
	if err != nil {
		log.Err(err).Msg("unable to generate upload template")
		return
	}

	fmt.Fprint(w, tmpl)
}

func getUploadFile(w http.ResponseWriter, _ *http.Request) {
	tmpl, err := templates.ExecuteUploadFormTmpl(&forms.UploadForm{}, w)
	if err != nil {
		log.Err(err).Msg("unable to generate upload template")
		return
	}

	fmt.Fprint(w, tmpl)
}