/*
Copyright 2018 the Velero contributors.

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 clientmgmt

import (
	"testing"

	"github.com/pkg/errors"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/require"

	"github.com/vmware-tanzu/velero/pkg/plugin/framework"
)

type mockClientProtocol struct {
	mock.Mock
}

func (cp *mockClientProtocol) Close() error {
	args := cp.Called()
	return args.Error(0)
}

func (cp *mockClientProtocol) Dispense(name string) (interface{}, error) {
	args := cp.Called(name)
	return args.Get(0), args.Error(1)
}

func (cp *mockClientProtocol) Ping() error {
	args := cp.Called()
	return args.Error(0)
}

type mockClientDispenser struct {
	mock.Mock
}

func (cd *mockClientDispenser) ClientFor(name string) interface{} {
	args := cd.Called(name)
	return args.Get(0)
}

func TestDispense(t *testing.T) {
	tests := []struct {
		name            string
		missingKeyName  bool
		dispenseError   error
		clientDispenser bool
		expectedError   string
	}{
		{
			name:          "protocol client dispense error",
			dispenseError: errors.Errorf("protocol client dispense"),
			expectedError: "protocol client dispense",
		},
		{
			name: "plugin lister, no error",
		},
		{
			name:            "client dispenser, missing key name",
			clientDispenser: true,
			missingKeyName:  true,
			expectedError:   "ObjectStore plugin requested but name is missing",
		},
		{
			name:            "client dispenser, have key name",
			clientDispenser: true,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			p := new(process)
			protocolClient := new(mockClientProtocol)
			defer protocolClient.AssertExpectations(t)
			p.protocolClient = protocolClient

			clientDispenser := new(mockClientDispenser)
			defer clientDispenser.AssertExpectations(t)

			var client interface{}

			key := kindAndName{}
			if tc.clientDispenser {
				key.kind = framework.PluginKindObjectStore
				protocolClient.On("Dispense", key.kind.String()).Return(clientDispenser, tc.dispenseError)

				if !tc.missingKeyName {
					key.name = "aws"
					client = &framework.BackupItemActionGRPCClient{}
					clientDispenser.On("ClientFor", key.name).Return(client)
				}
			} else {
				key.kind = framework.PluginKindPluginLister
				client = &framework.PluginListerGRPCClient{}
				protocolClient.On("Dispense", key.kind.String()).Return(client, tc.dispenseError)
			}

			dispensed, err := p.dispense(key)

			if tc.expectedError != "" {
				assert.EqualError(t, err, tc.expectedError)
				return
			}
			require.NoError(t, err)
			assert.Equal(t, client, dispensed)
		})
	}
}
