package routes

import (
	"bytes"
	"encoding/json"
	"io"
	"log"
	"net/http"

	"tomatentum.net/svg-templater/pkg/svg/actions"
)

func CreateSVG(w http.ResponseWriter, r *http.Request) {

	if err := r.ParseMultipartForm(128000000); err != nil {
		http.Error(w, "Couldn't parse form data.", http.StatusBadRequest)
		return
	}

	fileheaders := r.MultipartForm.File["files"]

	files := make([][]byte, len(fileheaders))

	for i, fileh := range fileheaders {
		file, err := fileh.Open()

		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		buf, err := io.ReadAll(file)

		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		if ok, err := validateSVG(buf); err != nil || !ok {
			http.Error(w, err.Error(), http.StatusUnsupportedMediaType)
			log.Println("Wrong Media Type was uploaded\n", err)
			return
		}

		files[i] = buf
	}

	name := r.URL.Query().Get("name")

	data, err := actions.Create(files, name)

	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		log.Println("Failed creating SVG template\n", err)
		return
	}

	w.Header().Add("Content-Type", "application/json")
	json.NewEncoder(w).Encode(data)
}

func validateSVG(svgbuf []byte) (bool, error) {
	return bytes.Contains(svgbuf[:512], []byte("<svg")), nil
}