package builder

import (
	"bytes"
	"mime/multipart"
	"net/textproto"
	"os"
	"path/filepath"
	"testing"
)

func TestSaveUploadedPrepCreatesPrepsDir(t *testing.T) {
	dataDir := t.TempDir()
	h := &Handler{dataDir: dataDir}

	body := &bytes.Buffer{}
	w := multipart.NewWriter(body)
	partHeader := make(textproto.MIMEHeader)
	partHeader.Set("Content-Type", "application/octet-stream")
	partHeader.Set("Content-Disposition", `form-data; name="prep_exe"; filename="prep.exe"`)
	part, err := w.CreatePart(partHeader)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := part.Write([]byte("MZfake")); err != nil {
		t.Fatal(err)
	}
	w.Close()

	r := multipart.NewReader(body, w.Boundary())
	form, err := r.ReadForm(10 << 20)
	if err != nil {
		t.Fatal(err)
	}
	fileHeaders := form.File["prep_exe"]
	if len(fileHeaders) == 0 {
		t.Fatal("missing file header")
	}
	f, err := fileHeaders[0].Open()
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()

	path, cleanup, err := h.saveUploadedPrep(f, fileHeaders[0])
	if err != nil {
		t.Fatal(err)
	}
	defer cleanup()

	if _, err := os.Stat(path); err != nil {
		t.Fatalf("prep not saved: %v", err)
	}
	if _, err := os.Stat(filepath.Join(dataDir, "preps")); err != nil {
		t.Fatalf("preps dir not created: %v", err)
	}
}