// Copyright (c) The OpenTofu Authors
// SPDX-License-Identifier: MPL-2.0
// Copyright (c) 2023 HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package arguments

import (
	"strings"
	"testing"

	"github.com/hashicorp/hcl/v2"
	"github.com/opentofu/opentofu/internal/command/flags"
	"github.com/opentofu/opentofu/internal/tfdiags"

	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
	"github.com/opentofu/opentofu/internal/addrs"
	"github.com/opentofu/opentofu/internal/plans"
)

func TestParseApply_basicValid(t *testing.T) {
	testCases := map[string]struct {
		args []string
		want *Apply
	}{
		"defaults": {
			nil,
			&Apply{
				AutoApprove: false,
				ViewOptions: ViewOptions{
					InputEnabled: true,
					ViewType:     ViewHuman,
				},
				PlanPath: "",
				State:    &State{Lock: true},
				Vars:     &Vars{},
				Operation: &Operation{
					PlanMode:    plans.NormalMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
		"auto-approve, disabled input, and plan path": {
			[]string{"-auto-approve", "-input=false", "saved.tfplan"},
			&Apply{
				AutoApprove: true,
				ViewOptions: ViewOptions{
					InputEnabled: false,
					ViewType:     ViewHuman,
				},
				PlanPath: "saved.tfplan",
				State:    &State{Lock: true},
				Vars:     &Vars{},
				Operation: &Operation{
					PlanMode:    plans.NormalMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
		"destroy mode": {
			[]string{"-destroy"},
			&Apply{
				AutoApprove: false,
				ViewOptions: ViewOptions{
					InputEnabled: true,
					ViewType:     ViewHuman,
				},
				PlanPath: "",
				State:    &State{Lock: true},
				Vars:     &Vars{},
				Operation: &Operation{
					PlanMode:    plans.DestroyMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
		"JSON view disables input": {
			[]string{"-json", "-auto-approve"},
			&Apply{
				AutoApprove: true,
				ViewOptions: ViewOptions{
					InputEnabled: false,
					ViewType:     ViewJSON,
				},
				PlanPath: "",
				State:    &State{Lock: true},
				Vars:     &Vars{},
				Operation: &Operation{
					PlanMode:    plans.NormalMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
	}

	cmpOpts := cmpopts.IgnoreUnexported(Operation{}, Vars{}, State{}, ViewOptions{})

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)
			if len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			}
			if diff := cmp.Diff(tc.want, got, cmpOpts); diff != "" {
				t.Errorf("unexpected result\n%s", diff)
			}
		})
	}
}

func TestParseApply_json(t *testing.T) {
	testCases := map[string]struct {
		args        []string
		wantSuccess bool
	}{
		"-json": {
			[]string{"-json"},
			false,
		},
		"-json -auto-approve": {
			[]string{"-json", "-auto-approve"},
			true,
		},
		"-json saved.tfplan": {
			[]string{"-json", "saved.tfplan"},
			true,
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)

			if tc.wantSuccess {
				if len(diags) > 0 {
					t.Errorf("unexpected diags: %v", diags)
				}
			} else {
				if got, want := diags.Err().Error(), "Plan file or auto-approve required"; !strings.Contains(got, want) {
					t.Errorf("wrong diags\n got: %s\nwant: %s", got, want)
				}
			}

			if got.ViewOptions.ViewType != ViewJSON {
				t.Errorf("unexpected view type. got: %#v, want: %#v", got.ViewOptions.ViewType, ViewJSON)
			}
		})
	}
}

func TestParseApply_invalid(t *testing.T) {
	got, _, diags := ParseApply([]string{"-frob"})
	if len(diags) == 0 {
		t.Fatal("expected diags but got none")
	}
	if got, want := diags.Err().Error(), "flag provided but not defined"; !strings.Contains(got, want) {
		t.Fatalf("wrong diags\n got: %s\nwant: %s", got, want)
	}
	if got.ViewOptions.ViewType != ViewHuman {
		t.Fatalf("wrong view type, got %#v, want %#v", got.ViewOptions.ViewType, ViewHuman)
	}
}

func TestParseApply_tooManyArguments(t *testing.T) {
	got, _, diags := ParseApply([]string{"saved.tfplan", "please"})
	if len(diags) == 0 {
		t.Fatal("expected diags but got none")
	}
	if got, want := diags.Err().Error(), "Too many command line arguments"; !strings.Contains(got, want) {
		t.Fatalf("wrong diags\n got: %s\nwant: %s", got, want)
	}
	if got.ViewOptions.ViewType != ViewHuman {
		t.Fatalf("wrong view type, got %#v, want %#v", got.ViewOptions.ViewType, ViewHuman)
	}
}

func TestParseApply_targets(t *testing.T) {
	foobarbaz, _ := addrs.ParseTargetStr("foo_bar.baz")
	boop, _ := addrs.ParseTargetStr("module.boop")
	testCases := map[string]struct {
		args    []string
		want    []addrs.Targetable
		wantErr string
	}{
		"no targets by default": {
			args: nil,
			want: nil,
		},
		"one target": {
			args: []string{"-target=foo_bar.baz"},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"two targets": {
			args: []string{"-target=foo_bar.baz", "-target", "module.boop"},
			want: []addrs.Targetable{foobarbaz.Subject, boop.Subject},
		},
		"invalid traversal": {
			args:    []string{"-target=foo."},
			want:    nil,
			wantErr: "Dot must be followed by attribute name",
		},
		"invalid target": {
			args:    []string{"-target=data[0].foo"},
			want:    nil,
			wantErr: "A data source name is required",
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)
			if tc.wantErr == "" && len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			} else if tc.wantErr != "" {
				if len(diags) == 0 {
					t.Fatalf("expected diags but got none")
				} else if got := diags.Err().Error(); !strings.Contains(got, tc.wantErr) {
					t.Fatalf("wrong diags\n got: %s\nwant: %s", got, tc.wantErr)
				}
			}
			if !cmp.Equal(got.Operation.Targets, tc.want) {
				t.Fatalf("unexpected result\n%s", cmp.Diff(got.Operation.Targets, tc.want))
			}
		})
	}
}

func TestParseApply_targetFile(t *testing.T) {
	foobarbaz, _ := addrs.ParseTargetStr("foo_bar.baz")
	boop, _ := addrs.ParseTargetStr("module.boop")
	barbaz, _ := addrs.ParseTargetStr("bar.baz")
	testCases := map[string]struct {
		files []mockFile
		want  []addrs.Targetable
	}{
		"target file no targets": {
			files: []mockFile{},
			want:  nil,
		},
		"target file valid single target": {
			files: []mockFile{
				{fileContent: "foo_bar.baz"}},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"target file valid multiple targets": {
			files: []mockFile{
				{fileContent: "foo_bar.baz\nmodule.boop"},
			},
			want: []addrs.Targetable{foobarbaz.Subject, boop.Subject},
		},
		"target file invalid target": {
			files: []mockFile{
				{
					fileContent: "foo.",
					diags: hcl.Diagnostics{
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Attribute name required",
							Detail:   "Dot must be followed by attribute name.",
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
								End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
							},
							Context: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 1},
								End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
							},
						},
					},
				},
			},
			want: nil,
		},
		"multiple files valid targets": {
			files: []mockFile{
				{fileContent: "foo_bar.baz"},
				{fileContent: "module.boop"},
			},
			want: []addrs.Targetable{foobarbaz.Subject, boop.Subject},
		},
		"multiple files invalid target": {
			files: []mockFile{
				{fileContent: "foo_bar.baz"},
				{
					fileContent: "modu(le.boop",
					diags: hcl.Diagnostics{
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Invalid character",
							Detail:   `Expected an attribute access or an index operator.`,
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
							},
							Context: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 1},
								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
							},
						},
					},
				},
			},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"multiple files multiple invalid targets": {
			files: []mockFile{
				{
					fileContent: "modu(le.boop",
					diags: hcl.Diagnostics{
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Invalid character",
							Detail:   "Expected an attribute access or an index operator.",
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
							},
							Context: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 1},
								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
							},
						},
					},
				},
				{fileContent: "foo_bar.baz"},
				{
					fileContent: "bar^.baz",
					diags: []*hcl.Diagnostic{
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Unsupported operator",
							Detail:   `Bitwise operators are not supported.`,
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 4, Byte: 3},
								End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
							},
						},
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Invalid character",
							Detail:   "Expected an attribute access or an index operator.",
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 4, Byte: 3},
								End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
							},
							Context: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 1},
								End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
							},
						},
					},
				},
			},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"target file valid comment": {
			files: []mockFile{
				{fileContent: "#foo_bar.baz"},
			},
			want: nil,
		},
		"target file valid spaces": {
			files: []mockFile{
				{fileContent: "   foo_bar.baz"},
			},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"target file valid tab": {
			files: []mockFile{
				{fileContent: "\tfoo_bar.baz"},
			},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"target file valid complicated": {
			files: []mockFile{
				{fileContent: "\tmodule.boop\n#foo_bar.baz\nbar.baz"},
			},
			want: []addrs.Targetable{boop.Subject, barbaz.Subject},
		},
		"target file invalid bracket with spaces": {
			files: []mockFile{
				{
					fileContent: `    [boop]`,
					diags: hcl.Diagnostics{
						&hcl.Diagnostic{
							Severity: hcl.DiagError,
							Summary:  "Variable name required",
							Detail:   `Must begin with a variable name.`,
							Subject: &hcl.Range{
								Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
								End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
							},
						},
					},
				},
			},
			want: nil,
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			targetFileArguments := []string{}
			wantDiags := tfdiags.Diagnostics{}
			for _, mockFile := range tc.files {
				mockFile.tempFileWriter(t)
				targetFileArguments = append(targetFileArguments, "-target-file="+mockFile.filePath)

				// for setting the correct filePath on each wantDiag
				if len(mockFile.diags) > 0 {
					for _, diag := range mockFile.diags {
						diag.Subject.Filename = mockFile.filePath
						if diag.Context != nil {
							diag.Context.Filename = mockFile.filePath
						}
						wantDiags = wantDiags.Append(diag)
					}
				}
			}

			wantDiagsExported := wantDiags.ForRPC()

			got, _, gotDiags := ParseApply(targetFileArguments)
			gotDiagsExported := gotDiags.ForRPC()

			if len(wantDiagsExported) != 0 || len(gotDiags) != 0 {
				if len(gotDiags) == 0 {
					t.Fatalf("expected diags but got none")
				}
				if len(wantDiagsExported) == 0 {
					t.Fatalf("got diags but didn't want any: %v", gotDiags.ErrWithWarnings())
				}

				if diff := cmp.Diff(gotDiagsExported, wantDiagsExported); diff != "" {
					t.Fatalf("diff between want(+) and got(-) diagnostics\n%s", diff)
				}
			}
			if !cmp.Equal(got.Operation.Targets, tc.want) {
				t.Fatalf("diff between want(+) and got(-) targets\n%s", cmp.Diff(got.Operation.Targets, tc.want))
			}
		})
	}
}

func TestParseApply_excludes(t *testing.T) {
	foobarbaz, _ := addrs.ParseTargetStr("foo_bar.baz")
	boop, _ := addrs.ParseTargetStr("module.boop")
	testCases := map[string]struct {
		args    []string
		want    []addrs.Targetable
		wantErr string
	}{
		"no excludes by default": {
			args: nil,
			want: nil,
		},
		"one exclude": {
			args: []string{"-exclude=foo_bar.baz"},
			want: []addrs.Targetable{foobarbaz.Subject},
		},
		"two excludes": {
			args: []string{"-exclude=foo_bar.baz", "-exclude", "module.boop"},
			want: []addrs.Targetable{foobarbaz.Subject, boop.Subject},
		},
		"invalid traversal": {
			args:    []string{"-exclude=foo."},
			want:    nil,
			wantErr: "Dot must be followed by attribute name",
		},
		"invalid target": {
			args:    []string{"-exclude=data[0].foo"},
			want:    nil,
			wantErr: "A data source name is required",
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)
			if tc.wantErr == "" && len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			} else if tc.wantErr != "" {
				if len(diags) == 0 {
					t.Fatalf("expected diags but got none")
				} else if got := diags.Err().Error(); !strings.Contains(got, tc.wantErr) {
					t.Fatalf("wrong diags\n got: %s\nwant: %s", got, tc.wantErr)
				}
			}
			if !cmp.Equal(got.Operation.Excludes, tc.want) {
				t.Fatalf("unexpected result\n%s", cmp.Diff(got.Operation.Targets, tc.want))
			}
		})
	}
}

func TestParseApply_excludeFile(t *testing.T) {
	testCasesTest := map[string][]mockFile{
		"exclude file no targets": {
			{fileContent: "foo_bar.baz"},
		},
		"exclude file valid single target": {
			{fileContent: "foo_bar.baz"},
		},
		"exclude file valid multiple targets": {
			{fileContent: "foo_bar.baz\nmodule.boop"},
		},
		"exclude file invalid target": {
			{
				fileContent: "foo.",
				diags: hcl.Diagnostics{
					&hcl.Diagnostic{
						Severity: hcl.DiagError,
						Summary:  "Attribute name required",
						Detail:   "Dot must be followed by attribute name.",
						Subject: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
							End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
						},
						Context: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 1},
							End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
						},
					},
				},
			},
		},
		"multiple files multiple invalid targets": {
			{
				fileContent: "modu(le.boop",
				diags: hcl.Diagnostics{
					&hcl.Diagnostic{
						Severity: hcl.DiagError,
						Summary:  "Invalid character",
						Detail:   "Expected an attribute access or an index operator.",
						Subject: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 5, Byte: 4},
							End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
						},
						Context: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 1},
							End:   hcl.Pos{Line: 1, Column: 6, Byte: 5},
						},
					},
				},
			},
			{fileContent: "foo_bar.baz"},
			{
				fileContent: "wow^.ham",
				diags: []*hcl.Diagnostic{
					&hcl.Diagnostic{
						Severity: hcl.DiagError,
						Summary:  "Unsupported operator",
						Detail:   `Bitwise operators are not supported.`,
						Subject: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 4, Byte: 3},
							End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
						},
					},
					&hcl.Diagnostic{
						Severity: hcl.DiagError,
						Summary:  "Invalid character",
						Detail:   "Expected an attribute access or an index operator.",
						Subject: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 4, Byte: 3},
							End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
						},
						Context: &hcl.Range{
							Start: hcl.Pos{Line: 1, Column: 1},
							End:   hcl.Pos{Line: 1, Column: 5, Byte: 4},
						},
					},
				},
			},
		},
		"exclude file valid comment": {
			{fileContent: "#foo_bar.baz"},
		},
	}
	for name, tc := range testCasesTest {
		t.Run(name, func(t *testing.T) {
			excludeFileArguments := []string{}
			wantDiags := tfdiags.Diagnostics{}
			for _, mockFile := range tc {
				mockFile.tempFileWriter(t)
				excludeFileArguments = append(excludeFileArguments, "-exclude-file="+mockFile.filePath)

				// for setting the correct filePath on each wantDiag
				if len(mockFile.diags) > 0 {
					for _, diag := range mockFile.diags {
						diag.Subject.Filename = mockFile.filePath
						if diag.Context != nil {
							diag.Context.Filename = mockFile.filePath
						}
						wantDiags = wantDiags.Append(diag)
					}
				}
			}

			wantDiagsExported := wantDiags.ForRPC()

			got, _, gotDiags := ParseApply(excludeFileArguments)
			gotDiagsExported := gotDiags.ForRPC()

			if len(wantDiagsExported) != 0 || len(gotDiags) != 0 {
				if len(gotDiags) == 0 {
					t.Fatalf("expected diags but got none")
				}
				if len(wantDiagsExported) == 0 {
					t.Fatalf("got diags but didn't want any: %v", gotDiags.ErrWithWarnings())
				}

				if diff := cmp.Diff(gotDiagsExported, wantDiagsExported); diff != "" {
					t.Fatalf("diff between want(+) and got(-) diagnostics\n%s", diff)
				}
			}
			if len(got.Operation.Targets) > 0 {
				t.Fatalf("got targeted resources, but exclude-targets should not contain the targets\n%s", got.Operation.Targets)
			}
		})
	}
}

func TestParseApply_excludeAndTarget(t *testing.T) {
	got, _, gotDiags := ParseApply([]string{"-exclude=foo_bar.baz", "-target=foo_bar.bar"})
	if len(gotDiags) == 0 {
		t.Fatalf("expected error, but there was none")
	}

	wantDiags := tfdiags.Diagnostics{
		tfdiags.Sourceless(
			tfdiags.Error,
			"Invalid combination of arguments",
			"The target and exclude planning options are mutually-exclusive. Each plan must use either only the target options or only the exclude options.",
		),
	}
	if diff := cmp.Diff(wantDiags.ForRPC(), gotDiags.ForRPC()); diff != "" {
		t.Errorf("wrong diagnostics\n%s", diff)
	}
	if len(got.Operation.Targets) > 0 {
		t.Errorf("Did not expect operation to parse targets, but it parsed %d targets", len(got.Operation.Targets))
	}
	if len(got.Operation.Excludes) > 0 {
		t.Errorf("Did not expect operation to parse excludes, but it parsed %d targets", len(got.Operation.Excludes))
	}
}

func TestParseApply_replace(t *testing.T) {
	foobarbaz, _ := addrs.ParseAbsResourceInstanceStr("foo_bar.baz")
	foobarbeep, _ := addrs.ParseAbsResourceInstanceStr("foo_bar.beep")
	testCases := map[string]struct {
		args    []string
		want    []addrs.AbsResourceInstance
		wantErr string
	}{
		"no addresses by default": {
			args: nil,
			want: nil,
		},
		"one address": {
			args: []string{"-replace=foo_bar.baz"},
			want: []addrs.AbsResourceInstance{foobarbaz},
		},
		"two addresses": {
			args: []string{"-replace=foo_bar.baz", "-replace", "foo_bar.beep"},
			want: []addrs.AbsResourceInstance{foobarbaz, foobarbeep},
		},
		"non-resource-instance address": {
			args:    []string{"-replace=module.boop"},
			want:    nil,
			wantErr: "A resource instance address is required here.",
		},
		"data resource address": {
			args:    []string{"-replace=data.foo.bar"},
			want:    nil,
			wantErr: "Only managed resources can be used",
		},
		"invalid traversal": {
			args:    []string{"-replace=foo."},
			want:    nil,
			wantErr: "Dot must be followed by attribute name",
		},
		"invalid address": {
			args:    []string{"-replace=data[0].foo"},
			want:    nil,
			wantErr: "A data source name is required",
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)
			if tc.wantErr == "" && len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			} else if tc.wantErr != "" {
				if len(diags) == 0 {
					t.Fatalf("expected diags but got none")
				} else if got := diags.Err().Error(); !strings.Contains(got, tc.wantErr) {
					t.Fatalf("wrong diags\n got: %s\nwant: %s", got, tc.wantErr)
				}
			}
			if !cmp.Equal(got.Operation.ForceReplace, tc.want) {
				t.Fatalf("unexpected result\n%s", cmp.Diff(got.Operation.ForceReplace, tc.want))
			}
		})
	}
}

func TestParseApply_vars(t *testing.T) {
	testCases := map[string]struct {
		args []string
		want []flags.RawFlag
	}{
		"no var flags by default": {
			args: nil,
			want: nil,
		},
		"one var": {
			args: []string{"-var", "foo=bar"},
			want: []flags.RawFlag{
				{Name: "-var", Value: "foo=bar"},
			},
		},
		"one var-file": {
			args: []string{"-var-file", "cool.tfvars"},
			want: []flags.RawFlag{
				{Name: "-var-file", Value: "cool.tfvars"},
			},
		},
		"ordering preserved": {
			args: []string{
				"-var", "foo=bar",
				"-var-file", "cool.tfvars",
				"-var", "boop=beep",
			},
			want: []flags.RawFlag{
				{Name: "-var", Value: "foo=bar"},
				{Name: "-var-file", Value: "cool.tfvars"},
				{Name: "-var", Value: "boop=beep"},
			},
		},
	}

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApply(tc.args)
			if len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			}
			if vars := got.Vars.All(); !cmp.Equal(vars, tc.want) {
				t.Fatalf("unexpected result\n%s", cmp.Diff(vars, tc.want))
			}
			if got, want := got.Vars.Empty(), len(tc.want) == 0; got != want {
				t.Fatalf("expected Empty() to return %t, but was %t", want, got)
			}
		})
	}
}

func TestParseApplyDestroy_basicValid(t *testing.T) {
	testCases := map[string]struct {
		args []string
		want *Apply
	}{
		"defaults": {
			nil,
			&Apply{
				AutoApprove: false,
				ViewOptions: ViewOptions{
					InputEnabled: true,
					ViewType:     ViewHuman,
				},
				State: &State{Lock: true},
				Vars:  &Vars{},
				Operation: &Operation{
					PlanMode:    plans.DestroyMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
		"auto-approve and disabled input": {
			[]string{"-auto-approve", "-input=false"},
			&Apply{
				AutoApprove: true,
				ViewOptions: ViewOptions{
					InputEnabled: false,
					ViewType:     ViewHuman,
				},
				State: &State{Lock: true},
				Vars:  &Vars{},
				Operation: &Operation{
					PlanMode:    plans.DestroyMode,
					Parallelism: 10,
					Refresh:     true,
				},
			},
		},
	}

	cmpOpts := cmpopts.IgnoreUnexported(Operation{}, Vars{}, State{}, ViewOptions{})

	for name, tc := range testCases {
		t.Run(name, func(t *testing.T) {
			got, _, diags := ParseApplyDestroy(tc.args)
			if len(diags) > 0 {
				t.Fatalf("unexpected diags: %v", diags)
			}
			if diff := cmp.Diff(tc.want, got, cmpOpts); diff != "" {
				t.Errorf("unexpected result\n%s", diff)
			}
		})
	}
}

func TestParseApplyDestroy_invalid(t *testing.T) {
	t.Run("explicit destroy mode", func(t *testing.T) {
		got, _, diags := ParseApplyDestroy([]string{"-destroy"})
		if len(diags) == 0 {
			t.Fatal("expected diags but got none")
		}
		if got, want := diags.Err().Error(), "Invalid mode option:"; !strings.Contains(got, want) {
			t.Fatalf("wrong diags\n got: %s\nwant: %s", got, want)
		}
		if got.ViewOptions.ViewType != ViewHuman {
			t.Fatalf("wrong view type, got %#v, want %#v", got.ViewOptions.ViewType, ViewHuman)
		}
	})
}
