//go:build e2e
// +build e2e

package main

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

	expect "github.com/Netflix/go-expect"
	tfe "github.com/hashicorp/go-tfe"
	"github.com/hashicorp/terraform/internal/e2e"
	tfversion "github.com/hashicorp/terraform/version"
)

func Test_migrate_tfc_to_tfc_single_workspace(t *testing.T) {
	t.Parallel()
	skipWithoutRemoteTerraformVersion(t)
	ctx := context.Background()

	cases := map[string]struct {
		setup       func(t *testing.T) (string, func())
		operations  []operationSets
		validations func(t *testing.T, orgName string)
	}{
		"migrating from name to name": {
			setup: func(t *testing.T) (string, func()) {
				organization, cleanup := createOrganization(t)
				return organization.Name, cleanup
			},
			operations: []operationSets{
				{
					prep: func(t *testing.T, orgName, dir string) {
						wsName := "prod"
						// Creating the workspace here instead of it being created
						// dynamically in the Cloud StateMgr because we want to ensure that
						// the terraform version selected for the workspace matches the
						// terraform version of this current branch.
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("prod"),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendName(orgName, wsName)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init"},
							expectedCmdOutput: `Terraform Cloud has been successfully initialized!`,
						},
						{
							command:           []string{"workspace", "show"},
							expectedCmdOutput: `prod`, // this comes from the `prep` function
						},
						{
							command:           []string{"apply"},
							expectedCmdOutput: `Do you want to perform these actions in workspace "prod"?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Apply complete!`},
						},
					},
				},
				{
					prep: func(t *testing.T, orgName, dir string) {
						wsName := "dev"
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String(wsName),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendName(orgName, wsName)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init", "-migrate-state", "-ignore-remote-version"},
							expectedCmdOutput: `Do you want to copy existing state to Terraform Cloud?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Terraform Cloud has been successfully initialized!`},
						},
						{
							command:           []string{"workspace", "show"},
							expectedCmdOutput: `dev`, // this comes from the `prep` function
						},
					},
				},
			},
			validations: func(t *testing.T, orgName string) {
				wsList, err := tfeClient.Workspaces.List(ctx, orgName, tfe.WorkspaceListOptions{})
				if err != nil {
					t.Fatal(err)
				}
				// this workspace name is what exists in the cloud backend configuration block
				if len(wsList.Items) != 2 {
					t.Fatal("Expected number of workspaces to be 2")
				}
			},
		},
		"migrating from name to tags": {
			setup: func(t *testing.T) (string, func()) {
				organization, cleanup := createOrganization(t)
				return organization.Name, cleanup
			},
			operations: []operationSets{
				{
					prep: func(t *testing.T, orgName, dir string) {
						wsName := "prod"
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("prod"),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendName(orgName, wsName)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init"},
							expectedCmdOutput: `Terraform Cloud has been successfully initialized!`,
						},
						{
							command:           []string{"apply"},
							expectedCmdOutput: `Do you want to perform these actions in workspace "prod"?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Apply complete!`},
						},
					},
				},
				{
					prep: func(t *testing.T, orgName, dir string) {
						tag := "app"
						tfBlock := terraformConfigCloudBackendTags(orgName, tag)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init", "-migrate-state", "-ignore-remote-version"},
							expectedCmdOutput: `Terraform Cloud requires all workspaces to be given an explicit name.`,
							userInput:         []string{"new-workspace", "yes"},
							postInputOutput: []string{
								`Do you want to copy existing state to Terraform Cloud?`,
								`Terraform Cloud has been successfully initialized!`},
						},
						{
							command:           []string{"workspace", "show"},
							expectedCmdOutput: `new-workspace`, // this comes from the `prep` function
						},
					},
				},
			},
			validations: func(t *testing.T, orgName string) {
				wsList, err := tfeClient.Workspaces.List(ctx, orgName, tfe.WorkspaceListOptions{
					Tags: tfe.String("app"),
				})
				if err != nil {
					t.Fatal(err)
				}
				// this workspace name is what exists in the cloud backend configuration block
				if len(wsList.Items) != 1 {
					t.Fatal("Expected number of workspaces to be 1")
				}
			},
		},
		"migrating from name to tags without ignore-version flag": {
			setup: func(t *testing.T) (string, func()) {
				organization, cleanup := createOrganization(t)
				return organization.Name, cleanup
			},
			operations: []operationSets{
				{
					prep: func(t *testing.T, orgName, dir string) {
						wsName := "prod"
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("prod"),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendName(orgName, wsName)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init"},
							expectedCmdOutput: `Terraform Cloud has been successfully initialized!`,
						},
						{
							command:           []string{"apply"},
							expectedCmdOutput: `Do you want to perform these actions in workspace "prod"?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Apply complete!`},
						},
					},
				},
				{
					prep: func(t *testing.T, orgName, dir string) {
						tag := "app"
						// This is only here to ensure that the updated terraform version is
						// present in the workspace, and it does not default to a lower
						// version that does not support `cloud`.
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("new-workspace"),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendTags(orgName, tag)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init", "-migrate-state"},
							expectedCmdOutput: `Terraform Cloud requires all workspaces to be given an explicit name.`,
							expectError:       true,
							userInput:         []string{"new-workspace", "yes"},
						},
					},
				},
			},
			validations: func(t *testing.T, orgName string) {
				wsList, err := tfeClient.Workspaces.List(ctx, orgName, tfe.WorkspaceListOptions{
					Tags: tfe.String("app"),
				})
				if err != nil {
					t.Fatal(err)
				}
				// The migration never occured, so we have no workspaces with this tag.
				if len(wsList.Items) != 0 {
					t.Fatalf("Expected number of workspaces to be 0, but got %d", len(wsList.Items))
				}
			},
		},
	}

	for name, tc := range cases {
		t.Log("Test: ", name)
		exp, err := expect.NewConsole(expect.WithStdout(os.Stdout), expect.WithDefaultTimeout(expectConsoleTimeout))
		if err != nil {
			t.Fatal(err)
		}
		defer exp.Close()

		tmpDir, err := ioutil.TempDir("", "terraform-test")
		if err != nil {
			t.Fatal(err)
		}
		defer os.RemoveAll(tmpDir)

		tf := e2e.NewBinary(terraformBin, tmpDir)
		defer tf.Close()
		tf.AddEnv("TF_LOG=INFO")
		tf.AddEnv(cliConfigFileEnv)

		orgName, cleanup := tc.setup(t)
		defer cleanup()
		for _, op := range tc.operations {
			op.prep(t, orgName, tf.WorkDir())
			for _, tfCmd := range op.commands {
				t.Log("Running commands: ", tfCmd.command)
				cmd := tf.Cmd(tfCmd.command...)
				cmd.Stdin = exp.Tty()
				cmd.Stdout = exp.Tty()
				cmd.Stderr = exp.Tty()

				err = cmd.Start()
				if err != nil {
					t.Fatal(err)
				}

				if tfCmd.expectedCmdOutput != "" {
					_, err := exp.ExpectString(tfCmd.expectedCmdOutput)
					if err != nil {
						t.Fatal(err)
					}
				}

				lenInput := len(tfCmd.userInput)
				lenInputOutput := len(tfCmd.postInputOutput)
				if lenInput > 0 {
					for i := 0; i < lenInput; i++ {
						input := tfCmd.userInput[i]
						exp.SendLine(input)
						// use the index to find the corresponding
						// output that matches the input.
						if lenInputOutput-1 >= i {
							output := tfCmd.postInputOutput[i]
							_, err := exp.ExpectString(output)
							if err != nil {
								t.Fatal(err)
							}
						}
					}
				}

				err = cmd.Wait()
				if err != nil && !tfCmd.expectError {
					t.Fatal(err.Error())
				}
			}
		}

		if tc.validations != nil {
			tc.validations(t, orgName)
		}
	}
}

func Test_migrate_tfc_to_tfc_multiple_workspace(t *testing.T) {
	t.Parallel()
	skipWithoutRemoteTerraformVersion(t)

	ctx := context.Background()

	cases := map[string]struct {
		setup       func(t *testing.T) (string, func())
		operations  []operationSets
		validations func(t *testing.T, orgName string)
	}{
		"migrating from multiple workspaces via tags to name": {
			setup: func(t *testing.T) (string, func()) {
				organization, cleanup := createOrganization(t)
				return organization.Name, cleanup
			},
			operations: []operationSets{
				{
					prep: func(t *testing.T, orgName, dir string) {
						tag := "app"
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("app-prod"),
							Tags:             []*tfe.Tag{{Name: tag}},
							TerraformVersion: tfe.String(tfversion.String()),
						})
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("app-staging"),
							Tags:             []*tfe.Tag{{Name: tag}},
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendTags(orgName, tag)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init"},
							expectedCmdOutput: `The currently selected workspace (default) does not exist.`,
							userInput:         []string{"1"},
							postInputOutput:   []string{`Terraform Cloud has been successfully initialized!`},
						},
						{
							command:           []string{"apply"},
							expectedCmdOutput: `Do you want to perform these actions in workspace "app-prod"?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Apply complete!`},
						},
						{
							command:           []string{"workspace", "select", "app-staging"},
							expectedCmdOutput: `Switched to workspace "app-staging".`,
						},
						{
							command:           []string{"apply"},
							expectedCmdOutput: `Do you want to perform these actions in workspace "app-staging"?`,
							userInput:         []string{"yes"},
							postInputOutput:   []string{`Apply complete!`},
						},
						{
							command:           []string{"output"},
							expectedCmdOutput: `tag_val = "app"`,
						},
					},
				},
				{
					prep: func(t *testing.T, orgName, dir string) {
						name := "service"
						// Doing this here instead of relying on dynamic workspace creation
						// because we want to set the terraform version here so that it is
						// using the right version for post init operations.
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String(name),
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendName(orgName, name)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init", "-migrate-state", "-ignore-remote-version"},
							expectedCmdOutput: `Do you want to copy only your current workspace?`,
							userInput:         []string{"yes", "yes"},
							postInputOutput: []string{
								`Do you want to copy existing state to Terraform Cloud?`,
								`Terraform Cloud has been successfully initialized!`},
						},
						{
							command:           []string{"workspace", "show"},
							expectedCmdOutput: `service`, // this comes from the `prep` function
						},
						{
							command:           []string{"output"},
							expectedCmdOutput: `tag_val = "app"`,
						},
					},
				},
			},
			validations: func(t *testing.T, orgName string) {
				ws, err := tfeClient.Workspaces.Read(ctx, orgName, "service")
				if err != nil {
					t.Fatal(err)
				}
				if ws == nil {
					t.Fatal("Expected to workspace not be empty")
				}
			},
		},
		"migrating from multiple workspaces via tags to other tags": {
			setup: func(t *testing.T) (string, func()) {
				organization, cleanup := createOrganization(t)
				return organization.Name, cleanup
			},
			operations: []operationSets{
				{
					prep: func(t *testing.T, orgName, dir string) {
						tag := "app"
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("app-prod"),
							Tags:             []*tfe.Tag{{Name: tag}},
							TerraformVersion: tfe.String(tfversion.String()),
						})
						_ = createWorkspace(t, orgName, tfe.WorkspaceCreateOptions{
							Name:             tfe.String("app-staging"),
							Tags:             []*tfe.Tag{{Name: tag}},
							TerraformVersion: tfe.String(tfversion.String()),
						})
						tfBlock := terraformConfigCloudBackendTags(orgName, tag)
						writeMainTF(t, tfBlock, dir)
					},
					commands: []tfCommand{
						{
							command:           []string{"init"},
							expectedCmdOutput: `The currently selected workspace (default) does not exist.`,
							userInput:         []string{"1"},
							postInputOutput:   []string{`Terraform Cloud has been successfully initialized!`},
						},
						{
							command:           []string{"apply", "-auto-approve"},
							expectedCmdOutput: `Apply complete!`,
						},
						{
							command:           []string{"workspace", "select", "app-staging"},
							expectedCmdOutput: `Switched to workspace "app-staging".`,
						},
						{
							command:           []string{"apply", "-auto-approve"},
							expectedCmdOutput: `Apply complete!`,
						},
					},
				},
				{
					prep: func(t *testing.T, orgName, dir string) {
						tag := "billing"
						tfBlock := terraformConfigCloudBackendTags(orgName, tag)
						writeMainTF(t, tfBlock, dir)
						t.Log(orgName)
					},
					commands: []tfCommand{
						{
							command:           []string{"init", "-migrate-state", "-ignore-remote-version"},
							expectedCmdOutput: `Would you like to rename your workspaces?`,
							userInput:         []string{"1", "new-*", "1"},
							postInputOutput: []string{
								`What pattern would you like to add to all your workspaces?`,
								`The currently selected workspace (app-staging) does not exist.`,
								`Terraform Cloud has been successfully initialized!`},
						},
					},
				},
			},
			validations: func(t *testing.T, orgName string) {
				wsList, err := tfeClient.Workspaces.List(ctx, orgName, tfe.WorkspaceListOptions{
					Tags: tfe.String("billing"),
				})
				if err != nil {
					t.Fatal(err)
				}
				if len(wsList.Items) != 2 {
					t.Logf("Expected the number of workspaces to be 2, but got %d", len(wsList.Items))
				}
				_, empty := getWorkspace(wsList.Items, "new-app-prod")
				if empty {
					t.Fatalf("expected workspaces to include 'new-app-prod' but didn't.")
				}
				_, empty = getWorkspace(wsList.Items, "new-app-staging")
				if empty {
					t.Fatalf("expected workspaces to include 'new-app-staging' but didn't.")
				}
			},
		},
	}

	for name, tc := range cases {
		t.Log("Test: ", name)
		exp, err := expect.NewConsole(expect.WithStdout(os.Stdout), expect.WithDefaultTimeout(expectConsoleTimeout))
		if err != nil {
			t.Fatal(err)
		}
		defer exp.Close()

		tmpDir, err := ioutil.TempDir("", "terraform-test")
		if err != nil {
			t.Fatal(err)
		}
		defer os.RemoveAll(tmpDir)

		tf := e2e.NewBinary(terraformBin, tmpDir)
		defer tf.Close()
		tf.AddEnv("TF_LOG=INFO")
		tf.AddEnv(cliConfigFileEnv)

		orgName, cleanup := tc.setup(t)
		defer cleanup()
		for _, op := range tc.operations {
			op.prep(t, orgName, tf.WorkDir())
			for _, tfCmd := range op.commands {
				t.Log("Running commands: ", tfCmd.command)
				cmd := tf.Cmd(tfCmd.command...)
				cmd.Stdin = exp.Tty()
				cmd.Stdout = exp.Tty()
				cmd.Stderr = exp.Tty()

				err = cmd.Start()
				if err != nil {
					t.Fatal(err)
				}

				if tfCmd.expectedCmdOutput != "" {
					_, err := exp.ExpectString(tfCmd.expectedCmdOutput)
					if err != nil {
						t.Fatal(err)
					}
				}

				lenInput := len(tfCmd.userInput)
				lenInputOutput := len(tfCmd.postInputOutput)
				if lenInput > 0 {
					for i := 0; i < lenInput; i++ {
						input := tfCmd.userInput[i]
						exp.SendLine(input)
						// use the index to find the corresponding
						// output that matches the input.
						if lenInputOutput-1 >= i {
							output := tfCmd.postInputOutput[i]
							_, err := exp.ExpectString(output)
							if err != nil {
								t.Fatal(err)
							}
						}
					}
				}

				t.Log(cmd.Stderr)
				err = cmd.Wait()
				if err != nil {
					t.Fatal(err.Error())
				}
			}
		}

		if tc.validations != nil {
			tc.validations(t, orgName)
		}
	}
}