// This file is part of MinIO Console Server
// Copyright (c) 2020 MinIO, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package restapi

import (
	"context"
	"errors"
	"fmt"
	"testing"

	"time"

	"github.com/go-openapi/swag"
	"github.com/minio/console/models"
	"github.com/minio/minio-go/v7"
	"github.com/minio/minio/pkg/madmin"
	"github.com/stretchr/testify/assert"
)

// assigning mock at runtime instead of compile time
var minioListBucketsWithContextMock func(ctx context.Context) ([]minio.BucketInfo, error)
var minioMakeBucketWithContextMock func(ctx context.Context, bucketName, location string) error
var minioSetBucketPolicyWithContextMock func(ctx context.Context, bucketName, policy string) error
var minioRemoveBucketMock func(bucketName string) error
var minioGetBucketPolicyMock func(bucketName string) (string, error)

// Define a mock struct of minio Client interface implementation
type minioClientMock struct {
}

// mock function of listBucketsWithContext()
func (mc minioClientMock) listBucketsWithContext(ctx context.Context) ([]minio.BucketInfo, error) {
	return minioListBucketsWithContextMock(ctx)
}

// mock function of makeBucketsWithContext()
func (mc minioClientMock) makeBucketWithContext(ctx context.Context, bucketName, location string) error {
	return minioMakeBucketWithContextMock(ctx, bucketName, location)
}

// mock function of setBucketPolicyWithContext()
func (mc minioClientMock) setBucketPolicyWithContext(ctx context.Context, bucketName, policy string) error {
	return minioSetBucketPolicyWithContextMock(ctx, bucketName, policy)
}

// mock function of removeBucket()
func (mc minioClientMock) removeBucket(ctx context.Context, bucketName string) error {
	return minioRemoveBucketMock(bucketName)
}

// imock function of getBucketPolicy()
func (mc minioClientMock) getBucketPolicy(ctx context.Context, bucketName string) (string, error) {
	return minioGetBucketPolicyMock(bucketName)
}

var minioAccountUsageInfoMock func(ctx context.Context) (madmin.AccountUsageInfo, error)

// mock function of dataUsageInfo() needed for list bucket's usage
func (ac adminClientMock) accountUsageInfo(ctx context.Context) (madmin.AccountUsageInfo, error) {
	return minioAccountUsageInfoMock(ctx)
}

func TestListBucket(t *testing.T) {
	assert := assert.New(t)
	adminClient := adminClientMock{}
	ctx := context.Background()
	// Test-1 : getaAcountUsageInfo() Get response from minio client with two buckets
	mockBucketList := madmin.AccountUsageInfo{
		AccountName: "test",
		Buckets: []madmin.BucketUsageInfo{
			{Name: "bucket-1", Created: time.Now(), Size: 1024},
			{Name: "bucket-2", Created: time.Now().Add(time.Hour * 1), Size: 0},
		},
	}
	// mock function response from listBucketsWithContext(ctx)
	minioAccountUsageInfoMock = func(ctx context.Context) (madmin.AccountUsageInfo, error) {
		return mockBucketList, nil
	}
	// get list buckets response this response should have Name, CreationDate, Size and Access
	// as part of of each bucket
	function := "getaAcountUsageInfo()"
	bucketList, err := getaAcountUsageInfo(ctx, adminClient)
	if err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}
	// verify length of buckets is correct
	assert.Equal(len(mockBucketList.Buckets), len(bucketList), fmt.Sprintf("Failed on %s: length of bucket's lists is not the same", function))
	for i, b := range bucketList {
		assert.Equal(mockBucketList.Buckets[i].Name, *b.Name)
		assert.Equal(mockBucketList.Buckets[i].Created.String(), b.CreationDate)
		assert.Equal(mockBucketList.Buckets[i].Name, *b.Name)
		assert.Equal(int64(mockBucketList.Buckets[i].Size), b.Size)
	}

	// Test-2 : getaAcountUsageInfo() Return and see that the error is handled correctly and returned
	minioAccountUsageInfoMock = func(ctx context.Context) (madmin.AccountUsageInfo, error) {
		return madmin.AccountUsageInfo{}, errors.New("error")
	}
	_, err = getaAcountUsageInfo(ctx, adminClient)
	if assert.Error(err) {
		assert.Equal("error", err.Error())
	}
}

func TestMakeBucket(t *testing.T) {
	assert := assert.New(t)
	// mock minIO client
	minClient := minioClientMock{}
	function := "makeBucket()"
	ctx := context.Background()
	// Test-1: makeBucket() create a bucket
	// mock function response from makeBucketWithContext(ctx)
	minioMakeBucketWithContextMock = func(ctx context.Context, bucketName, location string) error {
		return nil
	}
	if err := makeBucket(ctx, minClient, "bucktest1"); err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}

	// Test-2 makeBucket() make sure errors are handled correctly when error on MakeBucketWithContext
	minioMakeBucketWithContextMock = func(ctx context.Context, bucketName, location string) error {
		return errors.New("error")
	}
	if err := makeBucket(ctx, minClient, "bucktest1"); assert.Error(err) {
		assert.Equal("error", err.Error())
	}
}

func TestDeleteBucket(t *testing.T) {
	assert := assert.New(t)
	// mock minIO client
	minClient := minioClientMock{}
	function := "removeBucket()"

	// Test-1: removeBucket() delete a bucket
	// mock function response from removeBucket(bucketName)
	minioRemoveBucketMock = func(bucketName string) error {
		return nil
	}
	if err := removeBucket(minClient, "bucktest1"); err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}

	// Test-2: removeBucket() make sure errors are handled correctly when error on DeleteBucket()
	// mock function response from removeBucket(bucketName)
	minioRemoveBucketMock = func(bucketName string) error {
		return errors.New("error")
	}
	if err := removeBucket(minClient, "bucktest1"); assert.Error(err) {
		assert.Equal("error", err.Error())
	}
}

func TestBucketInfo(t *testing.T) {
	assert := assert.New(t)
	// mock minIO client
	minClient := minioClientMock{}
	function := "getBucketInfo()"

	// Test-1: getBucketInfo() get a bucket with PRIVATE access
	// if not policy set on bucket, access should be PRIVATE
	mockPolicy := ""
	minioGetBucketPolicyMock = func(bucketName string) (string, error) {
		return mockPolicy, nil
	}
	bucketToSet := "csbucket"
	outputExpected := &models.Bucket{
		Name:         swag.String(bucketToSet),
		Access:       models.BucketAccessPRIVATE,
		CreationDate: "", // to be implemented
		Size:         0,  // to be implemented
	}
	bucketInfo, err := getBucketInfo(minClient, bucketToSet)
	if err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}
	assert.Equal(outputExpected.Name, bucketInfo.Name)
	assert.Equal(outputExpected.Access, bucketInfo.Access)
	assert.Equal(outputExpected.CreationDate, bucketInfo.CreationDate)
	assert.Equal(outputExpected.Size, bucketInfo.Size)

	// Test-2: getBucketInfo() get a bucket with PUBLIC access
	// mock policy for bucket csbucket with readWrite access (should return PUBLIC)
	mockPolicy = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetBucketLocation\",\"s3:ListBucket\",\"s3:ListBucketMultipartUploads\"],\"Resource\":[\"arn:aws:s3:::csbucket\"]},{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetObject\",\"s3:ListMultipartUploadParts\",\"s3:PutObject\",\"s3:AbortMultipartUpload\",\"s3:DeleteObject\"],\"Resource\":[\"arn:aws:s3:::csbucket/*\"]}]}"
	minioGetBucketPolicyMock = func(bucketName string) (string, error) {
		return mockPolicy, nil
	}
	bucketToSet = "csbucket"
	outputExpected = &models.Bucket{
		Name:         swag.String(bucketToSet),
		Access:       models.BucketAccessPUBLIC,
		CreationDate: "", // to be implemented
		Size:         0,  // to be implemented
	}
	bucketInfo, err = getBucketInfo(minClient, bucketToSet)
	if err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}
	assert.Equal(outputExpected.Name, bucketInfo.Name)
	assert.Equal(outputExpected.Access, bucketInfo.Access)
	assert.Equal(outputExpected.CreationDate, bucketInfo.CreationDate)
	assert.Equal(outputExpected.Size, bucketInfo.Size)

	// Test-3: getBucketInfo() get a bucket with CUSTOM access
	// if bucket has a custom policy set it should return CUSTOM
	mockPolicy = "{\"Version\":\"2012-10-17\",\"Statement\":[]}"
	minioGetBucketPolicyMock = func(bucketName string) (string, error) {
		return mockPolicy, nil
	}
	bucketToSet = "csbucket"
	outputExpected = &models.Bucket{
		Name:         swag.String(bucketToSet),
		Access:       models.BucketAccessCUSTOM,
		CreationDate: "", // to be implemented
		Size:         0,  // to be implemented
	}
	bucketInfo, err = getBucketInfo(minClient, bucketToSet)
	if err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}
	assert.Equal(outputExpected.Name, bucketInfo.Name)
	assert.Equal(outputExpected.Access, bucketInfo.Access)
	assert.Equal(outputExpected.CreationDate, bucketInfo.CreationDate)
	assert.Equal(outputExpected.Size, bucketInfo.Size)

	// Test-4: getBucketInfo() returns an error while parsing invalid policy
	mockPolicy = "policyinvalid"
	minioGetBucketPolicyMock = func(bucketName string) (string, error) {
		return mockPolicy, nil
	}
	bucketToSet = "csbucket"
	outputExpected = &models.Bucket{
		Name:         swag.String(bucketToSet),
		Access:       models.BucketAccessCUSTOM,
		CreationDate: "", // to be implemented
		Size:         0,  // to be implemented
	}
	_, err = getBucketInfo(minClient, bucketToSet)
	if assert.Error(err) {
		assert.Equal("invalid character 'p' looking for beginning of value", err.Error())
	}

	// Test-4: getBucketInfo() handle GetBucketPolicy error correctly
	mockPolicy = ""
	minioGetBucketPolicyMock = func(bucketName string) (string, error) {
		return "", errors.New("error")
	}
	bucketToSet = "csbucket"
	outputExpected = &models.Bucket{
		Name:         swag.String(bucketToSet),
		Access:       models.BucketAccessCUSTOM,
		CreationDate: "", // to be implemented
		Size:         0,  // to be implemented
	}
	_, err = getBucketInfo(minClient, bucketToSet)
	if assert.Error(err) {
		assert.Equal("error", err.Error())
	}
}

func TestSetBucketAccess(t *testing.T) {
	assert := assert.New(t)
	ctx := context.Background()
	// mock minIO client
	minClient := minioClientMock{}

	function := "setBucketAccessPolicy()"
	// Test-1: setBucketAccessPolicy() set a bucket's access policy
	// mock function response from setBucketPolicyWithContext(ctx)
	minioSetBucketPolicyWithContextMock = func(ctx context.Context, bucketName, policy string) error {
		return nil
	}
	if err := setBucketAccessPolicy(ctx, minClient, "bucktest1", models.BucketAccessPUBLIC); err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}

	// Test-2: setBucketAccessPolicy() set private access
	if err := setBucketAccessPolicy(ctx, minClient, "bucktest1", models.BucketAccessPRIVATE); err != nil {
		t.Errorf("Failed on %s:, error occurred: %s", function, err.Error())
	}

	// Test-3: setBucketAccessPolicy() set invalid access, expected error
	if err := setBucketAccessPolicy(ctx, minClient, "bucktest1", "other"); assert.Error(err) {
		assert.Equal("access: `other` not supported", err.Error())
	}

	// Test-4: setBucketAccessPolicy() set access on empty bucket name, expected error
	if err := setBucketAccessPolicy(ctx, minClient, "", models.BucketAccessPRIVATE); assert.Error(err) {
		assert.Equal("error: bucket name not present", err.Error())
	}

	// Test-5: setBucketAccessPolicy() set empty access on bucket, expected error
	if err := setBucketAccessPolicy(ctx, minClient, "bucktest1", ""); assert.Error(err) {
		assert.Equal("error: bucket access not present", err.Error())
	}

	// Test-5: setBucketAccessPolicy() handle error on setPolicy call
	minioSetBucketPolicyWithContextMock = func(ctx context.Context, bucketName, policy string) error {
		return errors.New("error")
	}
	if err := setBucketAccessPolicy(ctx, minClient, "bucktest1", models.BucketAccessPUBLIC); assert.Error(err) {
		assert.Equal("error", err.Error())
	}

}