/*
 * Minio Cloud Storage, (C) 2015, 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 main

import (
	"io/ioutil"
	"os"
	"testing"
)

const (
	// singleNodeTestStr is the string which is used as notation for Single node ObjectLayer in the unit tests.
	singleNodeTestStr string = "SingleNode"
	// xLTestStr is the string which is used as notation for XL ObjectLayer in the unit tests.
	xLTestStr string = "XL"
)

// ExecObjectLayerTest - executes object layer tests.
// Creates single node and XL ObjectLayer instance and runs test for both the layers.
func ExecObjectLayerTest(t *testing.T, objTest func(obj ObjectLayer, instanceType string, t *testing.T)) {

	// getXLObjectLayer - Instantiates XL object layer and returns it.
	getXLObjectLayer := func() (ObjectLayer, []string, error) {
		var nDisks = 16 // Maximum disks.
		var erasureDisks []string
		for i := 0; i < nDisks; i++ {
			path, err := ioutil.TempDir(os.TempDir(), "minio-")
			if err != nil {
				return nil, nil, err
			}
			erasureDisks = append(erasureDisks, path)
		}
		objLayer, err := newXLObjects(erasureDisks)
		if err != nil {
			return nil, nil, err
		}
		return objLayer, erasureDisks, nil
	}

	// getSingleNodeObjectLayer - Instantiates single node object layer and returns it.
	getSingleNodeObjectLayer := func() (ObjectLayer, string, error) {
		// Make a temporary directory to use as the obj.
		fsDir, err := ioutil.TempDir("", "minio-")
		if err != nil {
			return nil, "", err
		}

		// Create the obj.
		objLayer, err := newFSObjects(fsDir)
		if err != nil {
			return nil, "", err
		}
		return objLayer, fsDir, nil
	}

	// removeRoots - Cleans up initialized directories during tests.
	removeRoots := func(roots []string) {
		for _, root := range roots {
			os.RemoveAll(root)
		}
	}

	objLayer, fsDir, err := getSingleNodeObjectLayer()
	if err != nil {
		t.Fatalf("Initialization of object layer failed for single node setup: %s", err.Error())
	}
	// Executing the object layer tests for single node setup.
	objTest(objLayer, singleNodeTestStr, t)
	initNSLock()
	objLayer, fsDirs, err := getXLObjectLayer()
	if err != nil {
		t.Fatalf("Initialization of object layer failed for XL setup: %s", err.Error())
	}
	// Executing the object layer tests for XL.
	objTest(objLayer, xLTestStr, t)
	defer removeRoots(append(fsDirs, fsDir))
}