package frontend

import (
	"encoding/json"
	"html/template"
	"log"
	"net/http"

	b "streifling.com/jason/cpolis/cmd/backend"
)

func UploadEasyMDEImage(c *b.Config, s map[string]*Session) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if _, err := ManageSession(w, r, c, s); err != nil {
			http.Error(w, "Die Session ist abgelaufen. Bitte erneut anmelden.", http.StatusUnauthorized)
			return
		}

		file, _, err := r.FormFile("article-image")
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		defer file.Close()

		filename, err := b.SaveImage(file, c.MaxImgHeight, c.MaxImgWidth, c.PicsDir+"/")
		if err != nil {
			if err == b.ErrUnsupportedFormat {
				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
				return
			}
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		url := c.Domain + "/image/serve/" + filename
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(url)
	}
}

func UploadImage(c *b.Config, s map[string]*Session, fileKey, htmlFile, htmlTemplate string) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if _, err := ManageSession(w, r, c, s); err != nil {
			http.Error(w, "Die Session ist abgelaufen. Bitte erneut anmelden.", http.StatusUnauthorized)
			return
		}

		file, _, err := r.FormFile(fileKey)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		defer file.Close()

		filename, err := b.SaveImage(file, c.MaxBannerHeight, c.MaxBannerWidth, c.PicsDir+"/")
		if err != nil {
			if err == b.ErrUnsupportedFormat {
				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
				return
			}
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		data := new(struct{ Image string })
		data.Image = filename

		tmpl, err := template.ParseFiles(c.WebDir + "/templates/" + htmlFile)
		if err = template.Must(tmpl, err).ExecuteTemplate(w, htmlTemplate, data); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}