package handlers

import (
	"encoding/json"
	"net/http"
	"path/filepath"

	"aroll/store"
)

func UploadHandler(st *store.Store) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
			return
		}

		r.Body = http.MaxBytesReader(w, r.Body, 5<<30)
		if err := r.ParseMultipartForm(32 << 20); err != nil {
			http.Error(w, "parse form: "+err.Error(), http.StatusBadRequest)
			return
		}
		defer r.MultipartForm.RemoveAll()

		file, header, err := r.FormFile("video")
		if err != nil {
			http.Error(w, "missing 'video' field", http.StatusBadRequest)
			return
		}
		defer file.Close()

		ext := filepath.Ext(header.Filename)
		if ext == "" {
			ext = ".mp4"
		}

		key, err := st.Save(file, ext)
		if err != nil {
			http.Error(w, "save: "+err.Error(), http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{"filename": key})
	}
}