// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Tests that involve both reading and writing.

package zip

import (
	"bytes"
	"fmt"
	"io"
	"reflect"
	"testing"
	"time"
)

type stringReaderAt string

func (s stringReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
	if off >= int64(len(s)) {
		return 0, io.EOF
	}
	n = copy(p, s[off:])
	return
}

func TestOver65kFiles(t *testing.T) {
	if testing.Short() {
		t.Logf("slow test; skipping")
		return
	}
	buf := new(bytes.Buffer)
	w := NewWriter(buf)
	const nFiles = (1 << 16) + 42
	for i := 0; i < nFiles; i++ {
		_, err := w.Create(fmt.Sprintf("%d.dat", i))
		if err != nil {
			t.Fatalf("creating file %d: %v", i, err)
		}
	}
	if err := w.Close(); err != nil {
		t.Fatalf("Writer.Close: %v", err)
	}
	rat := stringReaderAt(buf.String())
	zr, err := NewReader(rat, int64(len(rat)))
	if err != nil {
		t.Fatalf("NewReader: %v", err)
	}
	if got := len(zr.File); got != nFiles {
		t.Fatalf("File contains %d files, want %d", got, nFiles)
	}
	for i := 0; i < nFiles; i++ {
		want := fmt.Sprintf("%d.dat", i)
		if zr.File[i].Name != want {
			t.Fatalf("File(%d) = %q, want %q", i, zr.File[i].Name, want)
		}
	}
}

func TestModTime(t *testing.T) {
	var testTime = time.Date(2009, time.November, 10, 23, 45, 58, 0, time.UTC)
	fh := new(FileHeader)
	fh.SetModTime(testTime)
	outTime := fh.ModTime()
	if !outTime.Equal(testTime) {
		t.Errorf("times don't match: got %s, want %s", outTime, testTime)
	}
}

func TestFileHeaderRoundTrip(t *testing.T) {
	fh := &FileHeader{
		Name:             "foo.txt",
		UncompressedSize: 987654321,
		ModifiedTime:     1234,
		ModifiedDate:     5678,
	}
	fi := fh.FileInfo()
	fh2, err := FileInfoHeader(fi)

	// Ignore these fields:
	fh2.CreatorVersion = 0
	fh2.ExternalAttrs = 0

	if !reflect.DeepEqual(fh, fh2) {
		t.Errorf("mismatch\n input=%#v\noutput=%#v\nerr=%v", fh, fh2, err)
	}
	if sysfh, ok := fi.Sys().(*FileHeader); !ok && sysfh != fh {
		t.Errorf("Sys didn't return original *FileHeader")
	}
}