package web

import (
	"bytes"
	"io"
	"mime/multipart"
	"net/http"

	p "github.com/ajswis/go-pkparse-server/pokemon"
	"github.com/ajswis/go-pkparse-server/pokemon-parsing"
	"github.com/gin-gonic/gin"
)

/*
  curl -X POST http://localhost:8080/parse \
	  -F "pkmn=@/path/to/test/file1" \
	  -F "pkmn=@/path/to/test/file2" \
	  -H "Content-Type: multipart/form-data"
*/

// parse grabs multipart file uploads under the key `pkmn`, aggregates them, and
// delegates work to the parser.
// NOTE: This can probably be improved by 1) parallelizing upload reads, or 2)
// not accepting file uploads, preferring to service binary data as encoded
// strings
func (s *Server) parse(c *gin.Context) {
	form, err := c.MultipartForm()
	if err != nil {
		render(c, http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	var rawPokemon []p.RawPokemon
	var files []*multipart.FileHeader = form.File["pkmn"]
	for _, file := range files {
		var err error
		var src multipart.File

		src, err = file.Open()
		if err != nil {
			render(c, http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
		defer src.Close()

		buf := bytes.NewBuffer(nil)
		if _, err = io.Copy(buf, src); err != nil {
			render(c, http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		rawPokemon = append(rawPokemon, buf.Bytes())
	}

	pkmn, err := pokemonparsing.ParseAll(rawPokemon)
	if err != nil {
		render(c, http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}

	render(c, http.StatusOK, gin.H{"pkmn": pkmn})
}