/*
 * 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 (
	"reflect"
	"testing"
)

// Test for reduceErrs, reduceErr reduces collection
// of errors into a single maximal error with in the list.
func TestReduceErrs(t *testing.T) {
	// List all of all test cases to validate various cases of reduce errors.
	testCases := []struct {
		errs        []error
		ignoredErrs []error
		err         error
	}{
		// Validate if have reduced properly.
		{[]error{
			errDiskNotFound,
			errDiskNotFound,
			errDiskFull,
		}, []error{}, errDiskNotFound},
		// Validate if have no consensus.
		{[]error{
			errDiskFull,
			errDiskNotFound,
			nil, nil,
		}, []error{}, nil},
		// Validate if have consensus and errors ignored.
		{[]error{
			errVolumeNotFound,
			errVolumeNotFound,
			errVolumeNotFound,
			errDiskNotFound,
			errDiskNotFound,
		}, []error{errDiskNotFound}, errVolumeNotFound},
		{[]error{}, []error{}, nil},
	}
	// Validates list of all the testcases for returning valid errors.
	for i, testCase := range testCases {
		gotErr := reduceErrs(testCase.errs, testCase.ignoredErrs)
		if testCase.err != gotErr {
			t.Errorf("Test %d : expected %s, got %s", i+1, testCase.err, gotErr)
		}
	}
}

// TestHashOrder - test order of ints in array
func TestHashOrder(t *testing.T) {
	testCases := []struct {
		objectName  string
		hashedOrder []int
	}{
		// cases which should pass the test.
		// passing in valid object name.
		{"object", []int{15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}},
		{"The Shining Script <v1>.pdf", []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}},
		{"Cost Benefit Analysis (2009-2010).pptx", []int{15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}},
		{"117Gn8rfHL2ACARPAhaFd0AGzic9pUbIA/5OCn5A", []int{3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1, 2}},
		{"SHØRT", []int{11, 12, 13, 14, 15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}},
		{"There are far too many object names, and far too few bucket names!", []int{15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}},
		{"a/b/c/", []int{3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1, 2}},
		{"/a/b/c", []int{7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1, 2, 3, 4, 5, 6}},
		{string([]byte{0xff, 0xfe, 0xfd}), []int{15, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}},
	}

	// Tests hashing order to be consistent.
	for i, testCase := range testCases {
		hashedOrder := hashOrder(testCase.objectName, 16)
		if !reflect.DeepEqual(testCase.hashedOrder, hashedOrder) {
			t.Errorf("Test case %d: Expected \"%#v\" but failed \"%#v\"", i+1, testCase.hashedOrder, hashedOrder)
		}
	}

	// Tests hashing order to fail for when order is '-1'.
	if hashedOrder := hashOrder("This will fail", -1); hashedOrder != nil {
		t.Errorf("Test: Expect \"nil\" but failed \"%#v\"", hashedOrder)
	}
}