package dockerclient_test

import (
	"context"
	"encoding/json"
	"errors"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"sync"
	"syscall"
	"testing"
	"time"

	"proxyctl/internal/app"
	"proxyctl/internal/dockerclient"
	"proxyctl/internal/profile"
	"proxyctl/internal/target"
	"proxyctl/internal/target/targettest"
)

func TestDetectClassifiesMalformedClientConfigurationAsFailure(t *testing.T) {
	a := newAdapter(t, nil)
	writeConfig(t, a.ConfigPath(), `{"proxies":[]}`)

	detection := a.Detect(context.Background(), activeProfile())
	if detection.Err == nil || detection.Inspection.State != target.Disabled {
		t.Fatalf("detection = %#v, want failed Disabled inspection", detection)
	}
	if got := a.Inspect(context.Background(), activeProfile()); got.State != target.Disabled {
		t.Fatalf("maintenance inspection = %#v, want established Disabled semantics", got)
	}
}

func TestAvailabilityAndDescriptionDescribeOnlyDockerClientDefaults(t *testing.T) {
	a := newAdapter(t, nil)
	availability := a.Availability(context.Background())
	if !availability.Available || !strings.Contains(availability.Evidence, "Docker client configuration") {
		t.Fatalf("availability = %#v", availability)
	}
	description := a.Description()
	for _, phrase := range []string{"new containers and builds", "not Docker daemon registry access", "existing containers"} {
		if !strings.Contains(description.Details, phrase) {
			t.Errorf("details %q do not contain %q", description.Details, phrase)
		}
	}
	if a.ID() != "docker-containers" {
		t.Fatalf("ID = %q", a.ID())
	}

	root := t.TempDir()
	outside := dockerclient.New(dockerclient.Configuration{
		ConfigFile: filepath.Join(t.TempDir(), "config.json"), RecoveryFile: filepath.Join(root, "state.json"), TrustedRoots: []string{root},
	}, nil)
	if got := outside.Availability(context.Background()); got.Available {
		t.Fatalf("path outside owning user's trusted configuration roots is available: %#v", got)
	}
}

func TestDiagnosticChecksCoverSchemaAndAuthorityWithoutMutation(t *testing.T) {
	files := &countingFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapterWithFS(t, files)
	checks := a.DiagnosticChecks(context.Background(), activeProfile())
	for _, name := range []string{"required commands", "configuration schema", "write authority"} {
		found := false
		for _, check := range checks {
			found = found || check.Name == name
		}
		if !found {
			t.Errorf("diagnostics missing %q: %#v", name, checks)
		}
	}
	if files.writes != 0 {
		t.Fatalf("diagnostics wrote Docker client state %d times", files.writes)
	}
	for _, path := range []string{a.ConfigPath(), a.RecoveryPath(), a.LockPath()} {
		if _, err := os.Stat(path); !errors.Is(err, os.ErrNotExist) {
			t.Fatalf("diagnostics created %s: %v", path, err)
		}
	}
}

func TestDiagnosticsAndEnableRejectMalformedManagedProxyTypesWithoutMutation(t *testing.T) {
	for _, document := range []string{
		`{"proxies":[]}`,
		`{"proxies":{"default":[]}}`,
		`{"proxies":{"default":{"httpProxy":42}}}`,
		`{"proxies":{"default":{"httpsProxy":false}}}`,
		`{"proxies":{"default":{"allProxy":{}}}}`,
		`{"proxies":{"default":{"noProxy":[]}}}`,
	} {
		t.Run(document, func(t *testing.T) {
			files := &countingFS{FileSystem: dockerclient.OSFileSystem{}}
			a := newAdapterWithFS(t, files)
			writeConfig(t, a.ConfigPath(), document)
			before, err := os.ReadFile(a.ConfigPath())
			if err != nil {
				t.Fatal(err)
			}
			checks := a.DiagnosticChecks(context.Background(), activeProfile())
			if checks[1].OK {
				t.Fatalf("malformed schema passed diagnostics: %#v", checks)
			}
			writesBefore := files.writes
			result := a.SetDesired(context.Background(), true, activeProfile())
			if result.Err == nil {
				t.Fatalf("enable accepted malformed schema: %#v", result)
			}
			after, err := os.ReadFile(a.ConfigPath())
			if err != nil {
				t.Fatal(err)
			}
			if string(after) != string(before) || files.writes != writesBefore {
				t.Fatalf("malformed config was modified: writes %d -> %d", writesBefore, files.writes)
			}
		})
	}
}

func TestDockerClientAdapterRunsReusableTargetContract(t *testing.T) {
	targettest.Run(t, func(t *testing.T) targettest.Fixture {
		a := newAdapter(t, nil)
		return targettest.Fixture{
			Target: a, Active: activeProfile(), Secret: "secret",
			MakeExternal: func(t *testing.T) {
				writeConfig(t, a.ConfigPath(), `{"auths":{"registry.example":{}},"proxies":{"default":{"httpProxy":"http://prior.example:3128"}}}`)
			},
			MakeDrifted: func(t *testing.T) {
				updateDefaultKey(t, a.ConfigPath(), "httpProxy", json.RawMessage(`"http://changed.example:8080"`))
			},
			PermissionFailure: func(t *testing.T) target.OperationResult {
				failed := newAdapterWithFS(t, &failingFS{FileSystem: dockerclient.OSFileSystem{}, permission: true})
				return failed.SetDesired(context.Background(), true, activeProfile())
			},
			PartialFailure: func(t *testing.T) target.OperationResult {
				failed := newAdapterWithFS(t, &failingFS{FileSystem: dockerclient.OSFileSystem{}, failConfig: true})
				return failed.SetDesired(context.Background(), true, activeProfile())
			},
			RedactionFailure: func(t *testing.T) target.OperationResult {
				failed := newAdapterWithFS(t, &failingFS{FileSystem: dockerclient.OSFileSystem{}, leak: true})
				return failed.SetDesired(context.Background(), true, activeProfile())
			},
			RecoveryRetry: func(t *testing.T) (target.OperationResult, target.OperationResult, target.OperationResult) {
				files := &failingFS{FileSystem: dockerclient.OSFileSystem{}, failRecoveryOnce: true}
				retrying := newAdapterWithFS(t, files)
				writeConfig(t, retrying.ConfigPath(), `{"proxies":{"default":{"httpProxy":"http://prior.example:3128"}}}`)
				first := retrying.SetDesired(context.Background(), true, activeProfile())
				retry := retrying.SetDesired(context.Background(), true, activeProfile())
				disabled := retrying.SetDesired(context.Background(), false, nil)
				return first, retry, disabled
			},
		}
	})
}

func TestEnableSafelyMergesAndDisableRestoresPriorDefaults(t *testing.T) {
	a := newAdapter(t, nil)
	original := `{
  "auths": {"registry.example": {"auth": "opaque"}},
  "credsStore": "pass",
  "proxies": {
    "tcp://remote.example:2376": {"httpProxy": "http://remote.example:3128"},
    "default": {
      "httpProxy": "http://prior.example:3128",
      "ftpProxy": "http://ftp.example:2121",
      "customOption": {"keep": true}
    }
  },
  "pluginSetting": [1, 2, 3]
}`
	writeConfig(t, a.ConfigPath(), original)

	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil || got.Inspection.State != target.Enabled {
		t.Fatalf("enable = %#v", got)
	}
	config := readObject(t, a.ConfigPath())
	if _, ok := config["auths"]; !ok {
		t.Fatal("auths removed")
	}
	if _, ok := config["pluginSetting"]; !ok {
		t.Fatal("unknown top-level setting removed")
	}
	proxies := nestedObject(t, config, "proxies")
	if _, ok := proxies["tcp://remote.example:2376"]; !ok {
		t.Fatal("per-daemon proxy setting removed")
	}
	defaults := nestedObject(t, proxies, "default")
	assertJSONString(t, defaults, "httpProxy", "http://alice:secret@proxy.example:8080")
	assertJSONString(t, defaults, "httpsProxy", "https://proxy.example:8443")
	assertJSONString(t, defaults, "allProxy", "socks5h://proxy.example:1080")
	assertJSONString(t, defaults, "noProxy", "localhost,.example.com,10.0.0.0/8")
	if _, ok := defaults["ftpProxy"]; !ok {
		t.Fatal("unmanaged default option removed")
	}

	// An unrelated edit made while enabled must survive restoration.
	config["detachKeys"] = json.RawMessage(`"ctrl-x,x"`)
	writeObject(t, a.ConfigPath(), config)
	if got := a.SetDesired(context.Background(), false, nil); got.Err != nil || got.Inspection.State != target.External {
		t.Fatalf("disable = %#v", got)
	}
	restored := readObject(t, a.ConfigPath())
	if _, ok := restored["detachKeys"]; !ok {
		t.Fatal("external unrelated edit was removed")
	}
	defaults = nestedObject(t, nestedObject(t, restored, "proxies"), "default")
	assertJSONString(t, defaults, "httpProxy", "http://prior.example:3128")
	for _, key := range []string{"httpsProxy", "allProxy", "noProxy"} {
		if _, ok := defaults[key]; ok {
			t.Errorf("managed key %s was not restored to absence", key)
		}
	}
	if _, ok := defaults["customOption"]; !ok {
		t.Fatal("custom default option removed")
	}
}

func TestResetDriftedDockerClientRejectsAdministratorManagedKeyEditsWithoutWritesOrCleanup(t *testing.T) {
	files := &countingFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapterWithFS(t, files)
	writeConfig(t, a.ConfigPath(), `{"auths":{"keep":{}},"proxies":{"default":{"httpProxy":"http://prior.example:3128"}}}`)
	if result := a.SetDesired(context.Background(), true, activeProfile()); result.Err != nil {
		t.Fatal(result.Err)
	}
	updateDefaultKey(t, a.ConfigPath(), "httpProxy", json.RawMessage(`"http://administrator.example:3128"`))
	configBefore := readFile(t, a.ConfigPath())
	metadataBefore := readFile(t, a.RecoveryPath())
	writesBefore := files.writes

	reset := app.NewMaintenance(profile.State{Profiles: []profile.Profile{*activeProfile()}, ActiveProfile: activeProfile().Name}, []target.Target{a}, immediateLock{}, nil).Reset(context.Background(), true)
	if reset.Err == nil || len(reset.Targets) != 1 || reset.Targets[0].Inspection.State != target.Drifted || reset.Targets[0].Err == nil {
		t.Fatalf("conflicting reset = %#v", reset)
	}
	if !strings.Contains(reset.Targets[0].Err.Error(), "changed after proxyctl applied") || files.writes != writesBefore {
		t.Fatalf("conflict outcome=%#v writes=%d->%d", reset.Targets[0], writesBefore, files.writes)
	}
	if got := readFile(t, a.ConfigPath()); got != configBefore {
		t.Fatalf("conflict rewrote config:\n%s", got)
	}
	if got := readFile(t, a.RecoveryPath()); got != metadataBefore {
		t.Fatalf("conflict changed metadata:\n%s", got)
	}
}

func TestResetDriftedDockerClientAlreadyAtOriginalOnlyCleansMetadata(t *testing.T) {
	files := &countingFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapterWithFS(t, files)
	original := `{"auths":{"keep":{}},"proxies":{"default":{"httpProxy":"http://prior.example:3128","custom":{"keep":true}}}}`
	writeConfig(t, a.ConfigPath(), original)
	if result := a.SetDesired(context.Background(), true, activeProfile()); result.Err != nil {
		t.Fatal(result.Err)
	}
	writeConfig(t, a.ConfigPath(), original)
	writesBefore := files.writes

	reset := app.NewMaintenance(profile.State{Profiles: []profile.Profile{*activeProfile()}, ActiveProfile: activeProfile().Name}, []target.Target{a}, immediateLock{}, nil).Reset(context.Background(), true)
	if reset.Err != nil || len(reset.Targets) != 1 || reset.Targets[0].Inspection.State != target.External {
		t.Fatalf("already-original reset = %#v", reset)
	}
	if files.writes != writesBefore || readFile(t, a.ConfigPath()) != original {
		t.Fatalf("already-original reset wrote config: writes=%d->%d", writesBefore, files.writes)
	}
	if _, err := os.Stat(a.RecoveryPath()); !errors.Is(err, os.ErrNotExist) {
		t.Fatalf("recovery metadata remains: %v", err)
	}
}

func TestInspectionDistinguishesAllStatesAndManagedValueEditsDrift(t *testing.T) {
	a := newAdapter(t, nil)
	assertState(t, a, target.Disabled)
	writeConfig(t, a.ConfigPath(), `{"proxies":{"default":{"ftpProxy":"http://ftp.example:2121"}}}`)
	assertState(t, a, target.External)
	writeConfig(t, a.ConfigPath(), `{"proxies":{"default":{"noProxy":"localhost"}}}`)
	assertState(t, a, target.External)
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil {
		t.Fatal(got.Err)
	}
	assertState(t, a, target.Enabled)
	updateDefaultKey(t, a.ConfigPath(), "noProxy", json.RawMessage(`"externally-edited.example"`))
	assertState(t, a, target.Drifted)
}

func TestAddingEvenAnEmptyOrInvalidManagedValueIsDrift(t *testing.T) {
	for _, value := range []json.RawMessage{json.RawMessage(`""`), json.RawMessage(`[]`)} {
		a := newAdapter(t, nil)
		p := *activeProfile()
		p.AllURL = ""
		if got := a.SetDesired(context.Background(), true, &p); got.Err != nil {
			t.Fatal(got.Err)
		}
		updateDefaultKey(t, a.ConfigPath(), "allProxy", value)
		if got := a.Inspect(context.Background(), &p); got.State != target.Drifted {
			t.Fatalf("state = %s (%s), want Drifted", got.State, got.Evidence)
		}
	}
}

func TestDocumentedBypassFormsAreRepresentedWithoutLoss(t *testing.T) {
	a := newAdapter(t, nil)
	p := *activeProfile()
	p.Bypass = []string{"host.example", ".example.com", "192.0.2.1", "2001:db8::1", "10.0.0.0/8", "2001:db8::/32"}
	if got := a.SetDesired(context.Background(), true, &p); got.Err != nil {
		t.Fatal(got.Err)
	}
	defaults := nestedObject(t, nestedObject(t, readObject(t, a.ConfigPath()), "proxies"), "default")
	assertJSONString(t, defaults, "noProxy", "host.example,.example.com,192.0.2.1,2001:db8::1,10.0.0.0/8,2001:db8::/32")
}

func TestUnsupportedProfileDataPreventsAnyMutation(t *testing.T) {
	for _, tc := range []struct {
		name string
		edit func(*profile.Profile)
		want string
	}{
		{"SOCKS HTTP proxy", func(p *profile.Profile) { p.HTTPURL = "socks5://proxy.example:1080" }, "HTTP proxy"},
		{"SOCKS HTTPS proxy", func(p *profile.Profile) { p.HTTPSURL = "socks5h://proxy.example:1080" }, "HTTPS proxy"},
		{"invalid bypass", func(p *profile.Profile) { p.Bypass = []string{"host:8080"} }, "Bypass"},
	} {
		t.Run(tc.name, func(t *testing.T) {
			a := newAdapter(t, nil)
			writeConfig(t, a.ConfigPath(), `{"auths":{"keep":{}}}`)
			before := readFile(t, a.ConfigPath())
			p := *activeProfile()
			tc.edit(&p)
			got := a.SetDesired(context.Background(), true, &p)
			if got.Err == nil || !strings.Contains(got.Err.Error(), tc.want) || got.Inspection.State != target.Disabled {
				t.Fatalf("result = %#v", got)
			}
			if after := readFile(t, a.ConfigPath()); after != before {
				t.Fatalf("configuration mutated:\nbefore %s\nafter %s", before, after)
			}
			if _, err := os.Stat(a.RecoveryPath()); !errors.Is(err, os.ErrNotExist) {
				t.Fatalf("recovery metadata created: %v", err)
			}
		})
	}
}

func TestIncompleteRecoveryMetadataPreventsUnsafeRestoration(t *testing.T) {
	a := newAdapter(t, nil)
	writeConfig(t, a.ConfigPath(), `{"proxies":{"default":{"httpProxy":"http://must-not-be-deleted.example:3128"}}}`)
	writeConfig(t, a.RecoveryPath(), `{"configPresent":true,"proxiesPresent":true,"defaultPresent":true,"original":{},"fingerprint":"invalid"}`)
	before := readFile(t, a.ConfigPath())
	got := a.SetDesired(context.Background(), false, nil)
	if got.Err == nil || got.Inspection.State != target.Drifted {
		t.Fatalf("disable = %#v", got)
	}
	if after := readFile(t, a.ConfigPath()); after != before {
		t.Fatalf("incomplete recovery metadata changed config: %s", after)
	}
}

func TestUnmergeableJSONPreventsMutation(t *testing.T) {
	for _, contents := range []string{`not json`, `[]`, `{"proxies":"wrong"}`, `{"proxies":{"default":[]}}`} {
		t.Run(contents, func(t *testing.T) {
			a := newAdapter(t, nil)
			writeConfig(t, a.ConfigPath(), contents)
			before := readFile(t, a.ConfigPath())
			if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err == nil {
				t.Fatalf("enable accepted %q", contents)
			}
			if after := readFile(t, a.ConfigPath()); after != before {
				t.Fatalf("unsafe JSON merge changed configuration to %q", after)
			}
		})
	}
}

func TestConcurrentMutationsSerializeRecoveryAndConfiguration(t *testing.T) {
	files := &interleavingFS{FileSystem: dockerclient.OSFileSystem{}, firstRecovery: make(chan struct{}), secondRecovery: make(chan struct{}), secondConfig: make(chan struct{})}
	a := newAdapterWithFS(t, files)
	first := *activeProfile()
	first.Name = "first"
	first.HTTPURL = "http://first.example:8080"
	second := *activeProfile()
	second.Name = "second"
	second.HTTPURL = "http://second.example:8080"

	firstDone := make(chan target.OperationResult, 1)
	go func() { firstDone <- a.SetDesired(context.Background(), true, &first) }()
	select {
	case <-files.firstRecovery:
	case <-time.After(5 * time.Second):
		t.Fatal("first mutation did not reach recovery write")
	}
	secondDone := make(chan target.OperationResult, 1)
	go func() { secondDone <- a.SetDesired(context.Background(), true, &second) }()

	for name, done := range map[string]<-chan target.OperationResult{"first": firstDone, "second": secondDone} {
		select {
		case result := <-done:
			if result.Err != nil {
				t.Fatalf("%s mutation: %v", name, result.Err)
			}
		case <-time.After(5 * time.Second):
			t.Fatalf("%s mutation did not complete", name)
		}
	}
	if got := a.Inspect(context.Background(), &second); got.State != target.Enabled {
		t.Fatalf("final state = %s (%s), want second mutation consistently enabled", got.State, got.Evidence)
	}
}

func TestDockerClientLockSerializesAcrossProcesses(t *testing.T) {
	if root := os.Getenv("PROXYCTL_DOCKER_LOCK_HELPER_ROOT"); root != "" {
		a := dockerclient.New(dockerclient.Configuration{
			ConfigFile: filepath.Join(root, ".docker", "config.json"), RecoveryFile: filepath.Join(root, ".state", "proxyctl", "docker-containers.json"),
		}, dockerclient.OSFileSystem{})
		if result := a.SetDesired(context.Background(), true, activeProfile()); result.Err != nil {
			t.Fatal(result.Err)
		}
		return
	}

	a := newAdapter(t, nil)
	if err := os.MkdirAll(filepath.Dir(a.LockPath()), 0o700); err != nil {
		t.Fatal(err)
	}
	lock, err := os.OpenFile(a.LockPath(), os.O_CREATE|os.O_RDWR, 0o600)
	if err != nil {
		t.Fatal(err)
	}
	defer lock.Close()
	if err := syscall.Flock(int(lock.Fd()), syscall.LOCK_EX); err != nil {
		t.Fatal(err)
	}

	root := filepath.Dir(filepath.Dir(filepath.Dir(a.RecoveryPath())))
	command := exec.Command(os.Args[0], "-test.run=^TestDockerClientLockSerializesAcrossProcesses$")
	command.Env = append(os.Environ(), "PROXYCTL_DOCKER_LOCK_HELPER_ROOT="+root)
	done := make(chan error, 1)
	go func() { done <- command.Run() }()
	select {
	case err := <-done:
		t.Fatalf("child mutation did not wait for Docker client lock: %v", err)
	case <-time.After(100 * time.Millisecond):
	}
	if err := syscall.Flock(int(lock.Fd()), syscall.LOCK_UN); err != nil {
		t.Fatal(err)
	}
	select {
	case err := <-done:
		if err != nil {
			t.Fatalf("child mutation after unlock: %v", err)
		}
	case <-time.After(5 * time.Second):
		_ = command.Process.Kill()
		t.Fatal("child mutation remained blocked after unlock")
	}
	if got := a.Inspect(context.Background(), activeProfile()); got.State != target.Enabled {
		t.Fatalf("state after serialized child mutation = %s (%s)", got.State, got.Evidence)
	}
}

func TestWritesAreOwnerOnlyAtomicAndIdempotent(t *testing.T) {
	files := &countingFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapterWithFS(t, files)
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil {
		t.Fatal(got.Err)
	}
	writes := files.writes
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil {
		t.Fatal(got.Err)
	}
	if files.writes != writes {
		t.Fatalf("idempotent enable performed %d additional writes", files.writes-writes)
	}
	for _, path := range []string{a.ConfigPath(), a.RecoveryPath(), a.LockPath()} {
		info, err := os.Stat(path)
		if err != nil {
			t.Fatal(err)
		}
		if info.Mode().Perm() != 0o600 {
			t.Errorf("%s mode = %o", path, info.Mode().Perm())
		}
		matches, _ := filepath.Glob(filepath.Join(filepath.Dir(path), ".proxyctl-*"))
		if len(matches) != 0 {
			t.Errorf("atomic temporary files remain beside %s: %v", path, matches)
		}
	}
}

func TestOwnedWritesUseConfigurationOwner(t *testing.T) {
	root := t.TempDir()
	files := &ownershipFS{FileSystem: dockerclient.OSFileSystem{}}
	a := dockerclient.New(dockerclient.Configuration{ConfigFile: filepath.Join(root, ".docker", "config.json"), RecoveryFile: filepath.Join(root, ".state", "proxyctl", "docker-containers.json"), OwnFiles: true, UID: 1234, GID: 1235}, files)
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil {
		t.Fatal(got.Err)
	}
	if len(files.owners) != 3 {
		t.Fatalf("owners = %#v", files.owners)
	}
	for _, owner := range files.owners {
		if owner == nil || owner.UID != 1234 || owner.GID != 1235 {
			t.Fatalf("owner = %#v", owner)
		}
	}
}

func TestDescriptorAnchoredWritesDoNotFollowDockerConfigSymlinks(t *testing.T) {
	root, victim := t.TempDir(), t.TempDir()
	if err := os.Symlink(victim, filepath.Join(root, ".docker")); err != nil {
		t.Fatal(err)
	}
	a := dockerclient.New(dockerclient.Configuration{ConfigFile: filepath.Join(root, ".docker", "config.json"), RecoveryFile: filepath.Join(root, "state", "docker-containers.json"), TrustedRoots: []string{root}}, nil)
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err == nil {
		t.Fatal("enable followed symlinked Docker configuration ancestor")
	}
	entries, err := os.ReadDir(victim)
	if err != nil || len(entries) != 0 {
		t.Fatalf("victim changed: %v, %v", entries, err)
	}
}

func TestErrorsRedactCredentialsIncludingRestoreFailures(t *testing.T) {
	files := &failingFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapterWithFS(t, files)
	writeConfig(t, a.ConfigPath(), `{"proxies":{"default":{"httpProxy":"http://bob:prior-secret@prior.example:3128"}}}`)
	if got := a.SetDesired(context.Background(), true, activeProfile()); got.Err != nil {
		t.Fatal(got.Err)
	}
	files.failConfig = true
	files.restoreLeak = true
	got := a.SetDesired(context.Background(), false, nil)
	if got.Err == nil || strings.Contains(got.Err.Error(), "prior-secret") || strings.Contains(got.Err.Error(), "secret") {
		t.Fatalf("unredacted restore result = %#v", got)
	}
}

func activeProfile() *profile.Profile {
	return &profile.Profile{Name: "office", Mode: profile.AdvancedMode, HTTPURL: "http://alice:secret@proxy.example:8080", HTTPSURL: "https://proxy.example:8443", AllURL: "socks5h://proxy.example:1080", Bypass: []string{"localhost", ".example.com", "10.0.0.0/8"}}
}

func newAdapter(t *testing.T, files dockerclient.FileSystem) *dockerclient.Adapter {
	t.Helper()
	if files == nil {
		files = dockerclient.OSFileSystem{}
	}
	return newAdapterWithFS(t, files)
}

func newAdapterWithFS(t *testing.T, files dockerclient.FileSystem) *dockerclient.Adapter {
	t.Helper()
	root := t.TempDir()
	return dockerclient.New(dockerclient.Configuration{ConfigFile: filepath.Join(root, ".docker", "config.json"), RecoveryFile: filepath.Join(root, ".state", "proxyctl", "docker-containers.json")}, files)
}

func writeConfig(t *testing.T, path, contents string) {
	t.Helper()
	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, []byte(contents), 0o600); err != nil {
		t.Fatal(err)
	}
}

func readFile(t *testing.T, path string) string {
	t.Helper()
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	return string(data)
}

func readObject(t *testing.T, path string) map[string]json.RawMessage {
	t.Helper()
	var object map[string]json.RawMessage
	if err := json.Unmarshal([]byte(readFile(t, path)), &object); err != nil {
		t.Fatal(err)
	}
	return object
}

func writeObject(t *testing.T, path string, object map[string]json.RawMessage) {
	t.Helper()
	data, err := json.Marshal(object)
	if err != nil {
		t.Fatal(err)
	}
	writeConfig(t, path, string(data))
}

func nestedObject(t *testing.T, parent map[string]json.RawMessage, key string) map[string]json.RawMessage {
	t.Helper()
	var object map[string]json.RawMessage
	if err := json.Unmarshal(parent[key], &object); err != nil {
		t.Fatalf("%s is not an object: %v", key, err)
	}
	return object
}

func updateDefaultKey(t *testing.T, path, key string, value json.RawMessage) {
	t.Helper()
	config := readObject(t, path)
	proxies := nestedObject(t, config, "proxies")
	defaults := nestedObject(t, proxies, "default")
	defaults[key] = value
	defaultData, err := json.Marshal(defaults)
	if err != nil {
		t.Fatal(err)
	}
	proxies["default"] = defaultData
	proxyData, err := json.Marshal(proxies)
	if err != nil {
		t.Fatal(err)
	}
	config["proxies"] = proxyData
	writeObject(t, path, config)
}

func assertJSONString(t *testing.T, object map[string]json.RawMessage, key, want string) {
	t.Helper()
	var got string
	if err := json.Unmarshal(object[key], &got); err != nil || got != want {
		t.Fatalf("%s = %q (%v), want %q", key, got, err, want)
	}
}

func assertState(t *testing.T, a *dockerclient.Adapter, want target.State) {
	t.Helper()
	got := a.Inspect(context.Background(), activeProfile())
	if got.State != want {
		t.Fatalf("state = %s (%s), want %s", got.State, got.Evidence, want)
	}
}

type immediateLock struct{}

func (immediateLock) Lock(context.Context) (func(), error) { return func() {}, nil }

type failingFS struct {
	dockerclient.FileSystem
	permission, failConfig, leak, restoreLeak, failRecoveryOnce bool
}

func (f *failingFS) AtomicWrite(path string, data []byte, mode os.FileMode, owner *dockerclient.Ownership) error {
	if f.permission {
		return os.ErrPermission
	}
	if f.failRecoveryOnce && strings.HasSuffix(path, "docker-containers.json") {
		f.failRecoveryOnce = false
		return os.ErrPermission
	}
	if f.leak {
		return errors.New("write http://alice:secret@proxy.example:8080 failed")
	}
	if f.failConfig && strings.HasSuffix(path, "config.json") {
		if f.restoreLeak {
			return errors.New("restore http://bob:prior-secret@prior.example:3128 and http://alice:secret@proxy.example:8080 failed")
		}
		return os.ErrPermission
	}
	return f.FileSystem.AtomicWrite(path, data, mode, owner)
}

type concurrentChangeFS struct {
	dockerclient.FileSystem
	configPath string
	reads      int
}

func (f *concurrentChangeFS) ReadFile(path string) ([]byte, error) {
	if path == f.configPath {
		f.reads++
		if f.reads == 3 {
			if err := os.WriteFile(path, []byte(`{"auths":{"registry.example":{"auth":"external-update"}}}`), 0o600); err != nil {
				return nil, err
			}
		}
	}
	return f.FileSystem.ReadFile(path)
}

func TestConcurrentDockerConfigChangeIsNotOverwritten(t *testing.T) {
	files := &concurrentChangeFS{FileSystem: dockerclient.OSFileSystem{}}
	a := newAdapter(t, files)
	files.configPath = a.ConfigPath()
	writeConfig(t, a.ConfigPath(), `{"auths":{"registry.example":{"auth":"original"}}}`)

	result := a.SetDesired(context.Background(), true, activeProfile())
	if result.Err == nil || !strings.Contains(result.Err.Error(), "changed concurrently") {
		t.Fatalf("concurrent update result = %#v", result)
	}
	if got := readFile(t, a.ConfigPath()); !strings.Contains(got, "external-update") || strings.Contains(got, "httpProxy") {
		t.Fatalf("external Docker config update was overwritten: %s", got)
	}
}

type countingFS struct {
	dockerclient.FileSystem
	writes int
}

func (f *countingFS) AtomicWrite(path string, data []byte, mode os.FileMode, owner *dockerclient.Ownership) error {
	f.writes++
	return f.FileSystem.AtomicWrite(path, data, mode, owner)
}

type interleavingFS struct {
	dockerclient.FileSystem
	mu                                          sync.Mutex
	recoveryWrites, configWrites                int
	firstRecovery, secondRecovery, secondConfig chan struct{}
}

func (f *interleavingFS) AtomicWrite(path string, data []byte, mode os.FileMode, owner *dockerclient.Ownership) error {
	f.mu.Lock()
	isRecovery := strings.HasSuffix(path, "docker-containers.json")
	if isRecovery {
		f.recoveryWrites++
		call := f.recoveryWrites
		if call == 1 {
			close(f.firstRecovery)
		}
	} else {
		f.configWrites++
	}
	recoveryCall, configCall := f.recoveryWrites, f.configWrites
	f.mu.Unlock()

	if isRecovery && recoveryCall == 1 {
		select {
		case <-f.secondRecovery:
		case <-time.After(100 * time.Millisecond):
		}
		err := f.FileSystem.AtomicWrite(path, data, mode, owner)
		return err
	}
	if isRecovery && recoveryCall == 2 {
		err := f.FileSystem.AtomicWrite(path, data, mode, owner)
		close(f.secondRecovery)
		return err
	}
	if !isRecovery && configCall == 1 {
		select {
		case <-f.secondConfig:
		case <-time.After(100 * time.Millisecond):
		}
		return f.FileSystem.AtomicWrite(path, data, mode, owner)
	}
	if !isRecovery && configCall == 2 {
		err := f.FileSystem.AtomicWrite(path, data, mode, owner)
		close(f.secondConfig)
		return err
	}
	return f.FileSystem.AtomicWrite(path, data, mode, owner)
}

func (f *interleavingFS) WithLock(path string, owner *dockerclient.Ownership, action func() error) error {
	return f.FileSystem.WithLock(path, owner, action)
}

type ownershipFS struct {
	dockerclient.FileSystem
	owners []*dockerclient.Ownership
}

func (f *ownershipFS) AtomicWrite(path string, data []byte, mode os.FileMode, owner *dockerclient.Ownership) error {
	f.owners = append(f.owners, owner)
	return f.FileSystem.AtomicWrite(path, data, mode, nil)
}

func (f *ownershipFS) WithLock(path string, owner *dockerclient.Ownership, action func() error) error {
	f.owners = append(f.owners, owner)
	return f.FileSystem.WithLock(path, nil, action)
}