package image

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

var fileTypes = map[string]string{
	"image/jpeg": "jpg",
	"image/png":  "png",
}

// Handler image handler interface
type Handler interface {
	GetImage(w http.ResponseWriter, r *http.Request)
	PostImage(w http.ResponseWriter, r *http.Request)
}

// NewHandler create image handler struct
func NewHandler(service Servicer) Handler {
	return &imageHandler{service}
}

type imageHandler struct {
	service Servicer
}

func (h *imageHandler) GetImage(w http.ResponseWriter, r *http.Request) {
	log.Print("serving image")
	http.ServeFile(w, r, "foo.jpg")
}

// PostImage handler for creating an image post
func (h *imageHandler) PostImage(w http.ResponseWriter, r *http.Request) {
	// max size
	r.ParseMultipartForm(10 << 20)
	file, handler, err := r.FormFile("file")
	if err != nil {
		log.Printf("%s", err)
	}
	defer file.Close()
	fileBytes, err := ioutil.ReadAll(file)
	if err != nil {
		log.Printf("%s", err)
		log.Printf("unsupported filetype")
		w.WriteHeader(400)
		w.Write([]byte("Incorrect Content Type"))
		return
	}
	fileType := http.DetectContentType(fileBytes)
	if fileType != handler.Header.Get("Content-Type") {
		log.Printf("file type and content type do not match")
		w.WriteHeader(400)
		w.Write([]byte("Incorrect Content Type"))
		return
	}
	extension, exists := fileTypes[fileType]
	if !exists {
		log.Printf("unsupported filetype")
		w.WriteHeader(400)
		w.Write([]byte("Incorrect Content Type"))
		return
	}
	fileID, err := h.service.NewID()
	fileName := fmt.Sprintf("%s.%s", fileID, extension)
	h.service.AddFile(fileName, fileBytes)
	w.WriteHeader(201)
	w.Write([]byte("ok"))
}