package apitokens

import (
	"slices"
	"testing"
	"time"

	"git.julianfamily.org/keepassgo/internal/vault"
)

func TestTokenEntryRoundTripsThroughVaultEntry(t *testing.T) {
	t.Parallel()

	expiresAt := time.Date(2026, 4, 1, 12, 0, 0, 0, time.UTC)
	token := Token{
		ID:         "token-1",
		Name:       "Browser Connector",
		ClientName: "browser-extension",
		SecretHash: "deadbeef",
		CreatedAt:  time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC),
		ExpiresAt:  &expiresAt,
		Disabled:   true,
		Policies: []PolicyRule{
			{Effect: EffectAllow, Operation: OperationListEntries, Resource: Resource{Kind: ResourceGroup, Path: []string{"Root", "Internet"}}},
			{Effect: EffectDeny, Operation: OperationCopyPassword, Resource: Resource{Kind: ResourceEntry, EntryID: "bank-token"}},
		},
	}

	entry := token.Entry([]string{"Root", "API Tokens"})
	if entry.Fields[FieldType] != EntryTypeAPIToken {
		t.Fatalf("FieldType = %q, want %q", entry.Fields[FieldType], EntryTypeAPIToken)
	}

	got, ok, err := TokenFromEntry(entry)
	if err != nil {
		t.Fatalf("TokenFromEntry() error = %v", err)
	}
	if !ok {
		t.Fatal("TokenFromEntry() ok = false, want true")
	}
	if got.ID != token.ID || got.Name != token.Name || got.ClientName != token.ClientName || got.SecretHash != token.SecretHash || !got.Disabled {
		t.Fatalf("TokenFromEntry() = %#v, want %#v", got, token)
	}
	if got.ExpiresAt == nil || !got.ExpiresAt.Equal(expiresAt) {
		t.Fatalf("ExpiresAt = %#v, want %v", got.ExpiresAt, expiresAt)
	}
	if len(got.Policies) != 2 {
		t.Fatalf("len(Policies) = %d, want 2", len(got.Policies))
	}
}

func TestEntriesFiltersOnlyAPITokens(t *testing.T) {
	t.Parallel()

	model := vault.Model{
		Entries: []vault.Entry{
			{ID: "entry-1", Title: "Ordinary Entry"},
			Token{ID: "token-1", Name: "CLI", SecretHash: "hash-1", CreatedAt: time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC)}.Entry([]string{"Root", "API Tokens"}),
			Token{ID: "token-2", Name: "Browser", SecretHash: "hash-2", CreatedAt: time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC)}.Entry([]string{"Root", "API Tokens"}),
		},
	}

	got, err := Entries(model)
	if err != nil {
		t.Fatalf("Entries() error = %v", err)
	}
	if len(got) != 2 {
		t.Fatalf("len(Entries()) = %d, want 2", len(got))
	}
	if got[0].Name != "Browser" || got[1].Name != "CLI" {
		t.Fatalf("Entries() = %#v, want Browser then CLI by name sort", got)
	}
}

func TestUpsertCreatesAndUpdatesVaultTokenEntry(t *testing.T) {
	t.Parallel()

	model := vault.Model{}
	token := Token{
		ID:         "token-1",
		Name:       "CLI",
		ClientName: "grpc-cli",
		SecretHash: "hash-1",
		CreatedAt:  time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC),
	}

	Upsert(&model, token)
	if len(model.Entries) != 1 {
		t.Fatalf("len(model.Entries) = %d, want 1", len(model.Entries))
	}
	if got := model.ChildGroups([]string{"Root"}); !slices.Equal(got, []string{"API Tokens"}) {
		t.Fatalf("ChildGroups(Root) = %v, want [API Tokens]", got)
	}

	token.ClientName = "rotated-client"
	token.Disabled = true
	Upsert(&model, token)

	got, err := Find(model, "token-1")
	if err != nil {
		t.Fatalf("Find() error = %v", err)
	}
	if got.ClientName != "rotated-client" || !got.Disabled {
		t.Fatalf("Find() = %#v, want updated client name and disabled state", got)
	}
}

func TestDeleteRemovesTokenEntryByTokenID(t *testing.T) {
	t.Parallel()

	model := vault.Model{
		Entries: []vault.Entry{
			Token{ID: "token-1", Name: "CLI", SecretHash: "hash-1", CreatedAt: time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC)}.Entry(EntryPath),
			{ID: "entry-1", Title: "Regular Entry"},
		},
	}

	if err := Delete(&model, "token-1"); err != nil {
		t.Fatalf("Delete() error = %v", err)
	}
	if len(model.Entries) != 1 || model.Entries[0].ID != "entry-1" {
		t.Fatalf("model.Entries after Delete = %#v, want only regular entry", model.Entries)
	}
	if err := Delete(&model, "missing"); err != ErrTokenNotFound {
		t.Fatalf("Delete(missing) error = %v, want %v", err, ErrTokenNotFound)
	}
}

func TestIssueRotateDisableAndRevokeToken(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC)
	token, secret, err := Issue("Browser Connector", "browser-extension", nil, now)
	if err != nil {
		t.Fatalf("Issue() error = %v", err)
	}
	if token.ID == "" || secret == "" {
		t.Fatalf("Issue() returned empty token or secret: %#v %q", token, secret)
	}
	if token.SecretHash == secret {
		t.Fatal("SecretHash should not equal cleartext secret")
	}
	if token.Disabled {
		t.Fatal("Disabled = true, want false after Issue")
	}

	rotated, newSecret, err := Rotate(token, now.Add(time.Hour))
	if err != nil {
		t.Fatalf("Rotate() error = %v", err)
	}
	if rotated.ID != token.ID {
		t.Fatalf("Rotate() changed ID from %q to %q", token.ID, rotated.ID)
	}
	if newSecret == secret {
		t.Fatal("Rotate() returned the same cleartext secret, want a new one")
	}
	if rotated.SecretHash == token.SecretHash {
		t.Fatal("Rotate() left SecretHash unchanged")
	}

	disabled := Disable(rotated)
	if !disabled.Disabled {
		t.Fatal("Disable() did not set Disabled")
	}
	revoked := Revoke(disabled, now.Add(2*time.Hour))
	if !revoked.Disabled {
		t.Fatal("Revoke() should leave token disabled")
	}
	if revoked.RevokedAt == nil || !revoked.RevokedAt.Equal(now.Add(2*time.Hour)) {
		t.Fatalf("RevokedAt = %#v, want %v", revoked.RevokedAt, now.Add(2*time.Hour))
	}
}

func TestAuthenticateRejectsDisabledExpiredAndWrongSecret(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC)
	valid, secret, err := Issue("CLI", "cli-tool", nil, now)
	if err != nil {
		t.Fatalf("Issue() error = %v", err)
	}
	expired, expiredSecret, err := Issue("Expired", "cli-tool", nil, now)
	if err != nil {
		t.Fatalf("Issue(expired) error = %v", err)
	}
	expiredAt := now.Add(-time.Minute)
	expired.ExpiresAt = &expiredAt
	disabled, disabledSecret, err := Issue("Disabled", "cli-tool", nil, now)
	if err != nil {
		t.Fatalf("Issue(disabled) error = %v", err)
	}
	disabled = Disable(disabled)

	tokens := []Token{expired, disabled, valid}
	if _, err := Authenticate(tokens, "wrong-secret", now); err != ErrInvalidToken {
		t.Fatalf("Authenticate(wrong-secret) error = %v, want %v", err, ErrInvalidToken)
	}
	if _, err := Authenticate([]Token{expired}, expiredSecret, now); err != ErrExpiredToken {
		t.Fatalf("Authenticate(expired) error = %v, want %v", err, ErrExpiredToken)
	}
	if _, err := Authenticate([]Token{disabled}, disabledSecret, now); err != ErrDisabledToken {
		t.Fatalf("Authenticate(disabled) error = %v, want %v", err, ErrDisabledToken)
	}
	got, err := Authenticate(tokens, secret, now)
	if err != nil {
		t.Fatalf("Authenticate(valid) error = %v", err)
	}
	if got.ID != valid.ID {
		t.Fatalf("Authenticate(valid).ID = %q, want %q", got.ID, valid.ID)
	}
}

func TestEvaluatePolicyDistinguishesAllowDenyAndPrompt(t *testing.T) {
	t.Parallel()

	token := Token{
		ID: "token-1",
		Policies: []PolicyRule{
			{Effect: EffectAllow, Operation: OperationListEntries, Resource: Resource{Kind: ResourceGroup, Path: []string{"Root", "Internet"}}},
			{Effect: EffectDeny, Operation: OperationCopyPassword, Resource: Resource{Kind: ResourceEntry, EntryID: "amazon"}},
		},
	}

	decision := Evaluate(token, OperationListEntries, Resource{Kind: ResourceGroup, Path: []string{"Root", "Internet"}})
	if decision != DecisionAllow {
		t.Fatalf("Evaluate(allow) = %q, want %q", decision, DecisionAllow)
	}

	decision = Evaluate(token, OperationCopyPassword, Resource{Kind: ResourceEntry, EntryID: "amazon", Path: []string{"Root", "Internet"}})
	if decision != DecisionDeny {
		t.Fatalf("Evaluate(deny) = %q, want %q", decision, DecisionDeny)
	}

	decision = Evaluate(token, OperationCopyPassword, Resource{Kind: ResourceEntry, EntryID: "github", Path: []string{"Root", "Internet"}})
	if decision != DecisionPrompt {
		t.Fatalf("Evaluate(prompt) = %q, want %q", decision, DecisionPrompt)
	}
}

func TestEntryScopedDenyOverridesGroupAllow(t *testing.T) {
	t.Parallel()

	token := Token{
		ID: "token-1",
		Policies: []PolicyRule{
			{Effect: EffectAllow, Operation: OperationCopyPassword, Resource: Resource{Kind: ResourceGroup, Path: []string{"Root", "Internet"}}},
			{Effect: EffectDeny, Operation: OperationCopyPassword, Resource: Resource{Kind: ResourceEntry, EntryID: "bank", Path: []string{"Root", "Internet"}}},
		},
	}

	allowed := Evaluate(token, OperationCopyPassword, Resource{Kind: ResourceEntry, EntryID: "forum", Path: []string{"Root", "Internet"}})
	denied := Evaluate(token, OperationCopyPassword, Resource{Kind: ResourceEntry, EntryID: "bank", Path: []string{"Root", "Internet"}})
	if allowed != DecisionAllow || denied != DecisionDeny {
		t.Fatalf("Evaluate() allow/deny = %q/%q, want %q/%q", allowed, denied, DecisionAllow, DecisionDeny)
	}
}

func TestTokenEntryKeepsPoliciesStableAcrossRoundTripOrdering(t *testing.T) {
	t.Parallel()

	token := Token{
		ID:         "token-1",
		Name:       "CLI",
		ClientName: "cli",
		SecretHash: "hash",
		CreatedAt:  time.Date(2026, 3, 29, 12, 0, 0, 0, time.UTC),
		Policies: []PolicyRule{
			{Effect: EffectDeny, Operation: OperationCopyPassword, Resource: Resource{Kind: ResourceEntry, EntryID: "bank"}},
			{Effect: EffectAllow, Operation: OperationListEntries, Resource: Resource{Kind: ResourceGroup, Path: []string{"Root", "Internet"}}},
		},
	}

	got, ok, err := TokenFromEntry(token.Entry([]string{"Root", "API Tokens"}))
	if err != nil || !ok {
		t.Fatalf("TokenFromEntry() error = %v, ok=%v", err, ok)
	}
	if !slices.EqualFunc(got.Policies, token.Policies, func(a, b PolicyRule) bool {
		return a.Effect == b.Effect && a.Operation == b.Operation && a.Resource.Kind == b.Resource.Kind && a.Resource.EntryID == b.Resource.EntryID && slices.Equal(a.Resource.Path, b.Resource.Path)
	}) {
		t.Fatalf("Policies after round trip = %#v, want %#v", got.Policies, token.Policies)
	}
}