// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

package selector

import (
	"errors"
	"fmt"
	"testing"

	"github.com/aws/copilot-cli/internal/pkg/aws/ec2"
	"github.com/aws/copilot-cli/internal/pkg/term/selector/mocks"
	"github.com/golang/mock/gomock"
	"github.com/stretchr/testify/require"
)

type ec2SelectMocks struct {
	prompt *mocks.MockPrompter
	ec2Svc *mocks.MockVPCSubnetLister
}

func TestEc2Select_VPC(t *testing.T) {
	mockErr := errors.New("some error")
	testCases := map[string]struct {
		setupMocks func(mocks ec2SelectMocks)

		wantErr error
		wantVPC string
	}{
		"return error if fail to list VPCs": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCs().Return(nil, mockErr)

			},
			wantErr: fmt.Errorf("list VPC ID: some error"),
		},
		"return error if no VPC found": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCs().Return([]ec2.VPC{}, nil)

			},
			wantErr: ErrVPCNotFound,
		},
		"return error if fail to select a VPC": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCs().Return([]ec2.VPC{
					{
						Resource: ec2.Resource{
							ID: "mockVPC1",
						},
					},
					{
						Resource: ec2.Resource{
							ID: "mockVPC2",
						},
					},
				}, nil)
				m.prompt.EXPECT().SelectOne("Select a VPC", "Help text", []string{"mockVPC1", "mockVPC2"}, gomock.Any()).
					Return("", mockErr)

			},
			wantErr: fmt.Errorf("select VPC: some error"),
		},
		"success": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCs().Return([]ec2.VPC{
					{
						Resource: ec2.Resource{
							ID: "mockVPCID1",
						},
					},
					{
						Resource: ec2.Resource{
							ID:   "mockVPCID2",
							Name: "mockVPC2Name",
						},
					},
				}, nil)
				m.prompt.EXPECT().SelectOne("Select a VPC", "Help text", []string{"mockVPCID1", "mockVPCID2 (mockVPC2Name)"}, gomock.Any()).
					Return("mockVPC1", nil)

			},
			wantVPC: "mockVPC1",
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			ctrl := gomock.NewController(t)
			defer ctrl.Finish()

			mockec2Svc := mocks.NewMockVPCSubnetLister(ctrl)
			mockprompt := mocks.NewMockPrompter(ctrl)
			mocks := ec2SelectMocks{
				ec2Svc: mockec2Svc,
				prompt: mockprompt,
			}
			tc.setupMocks(mocks)

			sel := EC2Select{
				prompt: mockprompt,
				ec2Svc: mockec2Svc,
			}
			vpc, err := sel.VPC("Select a VPC", "Help text")
			if tc.wantErr != nil {
				require.EqualError(t, tc.wantErr, err.Error())
			} else {
				require.Equal(t, tc.wantVPC, vpc)
			}
		})
	}
}

func TestEc2Select_Subnets(t *testing.T) {
	mockErr := errors.New("some error")
	mockVPC := "mockVPC"
	testCases := map[string]struct {
		setupMocks func(mocks ec2SelectMocks)

		wantErr     error
		wantSubnets []string
	}{
		"return error if fail to list subnets": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCSubnets(mockVPC).Return(nil, mockErr)
			},
			wantErr: fmt.Errorf("list subnets for VPC mockVPC: some error"),
		},
		"return error if no subnets found": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCSubnets(mockVPC).Return(&ec2.VPCSubnets{
					Private: []ec2.Subnet{
						{
							Resource: ec2.Resource{
								ID: "mockSubnetID",
							},
						},
					},
				}, nil)
			},
			wantErr: ErrSubnetsNotFound,
		},
		"return error if fail to select": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCSubnets(mockVPC).Return(&ec2.VPCSubnets{
					Public: []ec2.Subnet{
						{
							Resource: ec2.Resource{
								ID: "mockSubnetID",
							},
						},
					},
				}, nil)
				m.prompt.EXPECT().MultiSelect("Select a subnet", "Help text", gomock.Any(), nil, gomock.Any()).
					Return(nil, mockErr)
			},
			wantErr: fmt.Errorf("some error"),
		},
		"success": {
			setupMocks: func(m ec2SelectMocks) {
				m.ec2Svc.EXPECT().ListVPCSubnets(mockVPC).Return(&ec2.VPCSubnets{
					Private: []ec2.Subnet{
						{
							Resource: ec2.Resource{
								ID: "mockSubnetID1",
							},
						},
					},
					Public: []ec2.Subnet{
						{
							Resource: ec2.Resource{
								ID: "mockSubnetID2",
							},
						},
						{
							Resource: ec2.Resource{
								ID:   "mockSubnetID3",
								Name: "mockSubnetName3",
							},
						},
					},
				}, nil)
				m.prompt.EXPECT().MultiSelect("Select a subnet", "Help text", []string{"mockSubnetID2", "mockSubnetID3 (mockSubnetName3)"}, nil, gomock.Any()).
					Return([]string{"mockSubnetID2", "mockSubnetID3 (mockSubnetName3)"}, nil)
			},
			wantSubnets: []string{"mockSubnetID2", "mockSubnetID3"},
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			ctrl := gomock.NewController(t)
			defer ctrl.Finish()

			mockec2Svc := mocks.NewMockVPCSubnetLister(ctrl)
			mockprompt := mocks.NewMockPrompter(ctrl)
			mocks := ec2SelectMocks{
				ec2Svc: mockec2Svc,
				prompt: mockprompt,
			}
			tc.setupMocks(mocks)

			sel := EC2Select{
				prompt: mockprompt,
				ec2Svc: mockec2Svc,
			}
			mockInput := SubnetsInput{
				Msg:      "Select a subnet",
				Help:     "Help text",
				VPCID:    mockVPC,
				IsPublic: true,
			}
			subnets, err := sel.selectFromVPCSubnets(mockInput)
			if tc.wantErr != nil {
				require.EqualError(t, tc.wantErr, err.Error())
			} else {
				require.Equal(t, tc.wantSubnets, subnets)
			}
		})
	}
}