/*
 * Minio Cloud Storage, (C) 2016 Minio, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cmd

import (
	"bytes"
	"os"
	"path/filepath"
	"testing"
)

// TestNewFS - tests initialization of all input disks
// and constructs a valid `FS` object layer.
func TestNewFS(t *testing.T) {
	// Do not attempt to create this path, the test validates
	// so that newFSObjects initializes non existing paths
	// and successfully returns initialized object layer.
	disk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
	defer removeAll(disk)

	// Setup to test errFSDiskFormat.
	disks := []string{}
	for i := 0; i < 6; i++ {
		xlDisk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
		defer removeAll(xlDisk)
		disks = append(disks, xlDisk)
	}

	// Initializes all disks with XL
	err := formatDisks(disks, nil)
	if err != nil {
		t.Fatalf("Unable to format XL %s", err)
	}
	_, err = newXLObjects(disks, nil)
	if err != nil {
		t.Fatalf("Unable to initialize XL object, %s", err)
	}

	testCases := []struct {
		disk        string
		expectedErr error
	}{
		{disk, nil},
		{disks[0], errFSDiskFormat},
	}

	for _, testCase := range testCases {
		if _, err := newFSObjects(testCase.disk); err != testCase.expectedErr {
			t.Fatalf("expected: %s, got: %s", testCase.expectedErr, err)
		}
	}
}

// TestFSShutdown - initialize a new FS object layer then calls Shutdown
// to check returned results
func TestFSShutdown(t *testing.T) {
	// Create an FS object and shutdown it. No errors expected
	disk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
	obj, err := newFSObjects(disk)
	if err != nil {
		t.Fatal("Cannot create a new FS object: ", err)
	}

	fs := obj.(fsObjects)
	fsStorage := fs.storage.(*posix)

	bucketName := "testbucket"
	objectName := "object"
	objectContent := "12345"

	obj.MakeBucket(bucketName)
	obj.PutObject(bucketName, objectName, int64(len(objectContent)), bytes.NewReader([]byte(objectContent)), nil)

	if err := fs.Shutdown(); err != nil {
		t.Fatal("Cannot shutdown the FS object: ", err)
	}

	// Create an FS and program errors with disks when shutdown is called
	for i := 1; i <= 5; i++ {
		naughty := newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
		fs.storage = naughty
		if err := fs.Shutdown(); errorCause(err) != errFaultyDisk {
			t.Fatal(i, ", Got unexpected fs shutdown error: ", err)
		}
	}

	removeAll(disk)
}