package cli

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	appcore "GoNavi-Wails/internal/app"
	"GoNavi-Wails/internal/connection"
	"GoNavi-Wails/internal/mcpserver"
	"GoNavi-Wails/internal/sqlaudit"
)

type fakeBackend struct {
	closed       bool
	saveCalls    int
	resolveCalls int

	connections []connection.SavedConnectionView
	resolveErr  error
	queryResult connection.QueryResult
	batchResult connection.QueryResult

	queryConfig           connection.ConnectionConfig
	querySQL              string
	queryOptions          appcore.HeadlessQueryOptions
	savedConnectionParams string
	batchConfig           connection.ConnectionConfig
	batchFile             string
	batchOptions          appcore.HeadlessSQLFileOptions
	auditFilter           sqlaudit.Filter
	auditFormat           string
	auditPath             string
	auditOverwrite        bool
}

func (backend *fakeBackend) Close() { backend.closed = true }

func (backend *fakeBackend) GetSavedConnections() ([]connection.SavedConnectionView, error) {
	return backend.connections, nil
}

func (backend *fakeBackend) SaveConnection(input connection.SavedConnectionInput) (connection.SavedConnectionView, error) {
	backend.saveCalls++
	backend.savedConnectionParams = input.Config.ConnectionParams
	return connection.SavedConnectionView{ID: input.ID, Name: input.Name, Config: input.Config}, nil
}

func (backend *fakeBackend) ImportLegacyConnections(items []connection.LegacySavedConnection) ([]connection.SavedConnectionView, error) {
	result := make([]connection.SavedConnectionView, 0, len(items))
	for _, item := range items {
		result = append(result, connection.SavedConnectionView{ID: item.ID, Name: item.Name, Config: item.Config})
	}
	return result, nil
}

func (backend *fakeBackend) ResolveSavedConnection(selector string) (connection.SavedConnectionView, error) {
	backend.resolveCalls++
	if backend.resolveErr != nil {
		return connection.SavedConnectionView{}, backend.resolveErr
	}
	for _, item := range backend.connections {
		if item.ID == selector || item.Name == selector {
			return item, nil
		}
	}
	return connection.SavedConnectionView{}, errors.New("saved connection not found")
}

func (backend *fakeBackend) Query(_ context.Context, config connection.ConnectionConfig, _ string, sql string, options appcore.HeadlessQueryOptions) connection.QueryResult {
	backend.queryConfig = config
	backend.querySQL = sql
	backend.queryOptions = options
	return backend.queryResult
}

func (backend *fakeBackend) ExportQueryToPath(context.Context, connection.ConnectionConfig, string, string, string, appcore.ExportFileOptions, bool) connection.QueryResult {
	return connection.QueryResult{Success: true}
}

func (backend *fakeBackend) ExecuteSQLFile(_ context.Context, config connection.ConnectionConfig, _ string, filePath string, options appcore.HeadlessSQLFileOptions) connection.QueryResult {
	backend.batchConfig = config
	backend.batchFile = filePath
	backend.batchOptions = options
	return backend.batchResult
}

func (backend *fakeBackend) ExportSQLAuditToPath(filter sqlaudit.Filter, format string, path string, overwrite bool) connection.QueryResult {
	backend.auditFilter = filter
	backend.auditFormat = format
	backend.auditPath = path
	backend.auditOverwrite = overwrite
	return connection.QueryResult{Success: true}
}

func runWithBackend(t *testing.T, fake *fakeBackend, args ...string) (int, string, string) {
	t.Helper()
	previous := newBackend
	newBackend = func(context.Context, appcore.HeadlessRuntimeOptions) (backend, error) {
		return fake, nil
	}
	t.Cleanup(func() { newBackend = previous })

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Run(context.Background(), args, &stdout, &stderr)
	return code, stdout.String(), stderr.String()
}

func TestRunVersionAcceptsFlagForm(t *testing.T) {
	var stdout bytes.Buffer
	var stderr bytes.Buffer
	if code := Run(context.Background(), []string{"--version"}, &stdout, &stderr); code != ExitSuccess {
		t.Fatalf("Run(--version) = %d, stderr=%s", code, stderr.String())
	}
	if !strings.Contains(stdout.String(), `"version":"`) {
		t.Fatalf("version output missing JSON payload: %s", stdout.String())
	}
}

func TestRunVersionRejectsExtraArguments(t *testing.T) {
	var stdout bytes.Buffer
	var stderr bytes.Buffer
	if code := Run(context.Background(), []string{"version", "extra"}, &stdout, &stderr); code != ExitUsage {
		t.Fatalf("Run(version extra) = %d, stderr=%s, want usage exit=%d", code, stderr.String(), ExitUsage)
	}
	if stdout.Len() != 0 || !strings.Contains(stderr.String(), `"code":"usage"`) {
		t.Fatalf("version extra output mismatch: stdout=%q stderr=%q", stdout.String(), stderr.String())
	}
}

func TestRunAuditWithoutSubcommandRejectsBeforeBackendInitialization(t *testing.T) {
	previous := newBackend
	started := false
	newBackend = func(context.Context, appcore.HeadlessRuntimeOptions) (backend, error) {
		started = true
		return nil, errors.New("runtime should not start for invalid audit command")
	}
	t.Cleanup(func() { newBackend = previous })

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Run(context.Background(), []string{"audit"}, &stdout, &stderr)
	if code != ExitUsage || started || stdout.Len() != 0 || !strings.Contains(stderr.String(), `"code":"usage"`) {
		t.Fatalf("audit exit=%d started=%t stdout=%q stderr=%q", code, started, stdout.String(), stderr.String())
	}
}

func TestRunCommandHelpSkipsRuntimeInitialization(t *testing.T) {
	previous := newBackend
	started := false
	newBackend = func(context.Context, appcore.HeadlessRuntimeOptions) (backend, error) {
		started = true
		return nil, errors.New("runtime should not start for help")
	}
	t.Cleanup(func() { newBackend = previous })

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	code := Run(context.Background(), []string{"query", "--help"}, &stdout, &stderr)
	if code != ExitSuccess || started || !strings.Contains(stdout.String(), "Usage: gonavi query") {
		t.Fatalf("help exit=%d started=%t stdout=%s stderr=%s", code, started, stdout.String(), stderr.String())
	}
}

func TestRunDataRootOverrideUsesActiveRootResolution(t *testing.T) {
	root := t.TempDir()
	t.Setenv("GONAVI_DATA_ROOT", "existing-root")

	previous := newBackend
	var receivedOptions appcore.HeadlessRuntimeOptions
	var receivedRoot string
	newBackend = func(_ context.Context, options appcore.HeadlessRuntimeOptions) (backend, error) {
		receivedOptions = options
		receivedRoot = os.Getenv("GONAVI_DATA_ROOT")
		return &fakeBackend{}, nil
	}
	t.Cleanup(func() { newBackend = previous })

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	if code := Run(context.Background(), []string{"--data-root", root, "list-connections"}, &stdout, &stderr); code != ExitSuccess {
		t.Fatalf("Run returned %d, stderr=%s", code, stderr.String())
	}
	if receivedOptions.DataRoot != "" {
		t.Fatalf("CLI bypassed ResolveActiveRoot with DataRoot=%q", receivedOptions.DataRoot)
	}
	if receivedRoot != root {
		t.Fatalf("GONAVI_DATA_ROOT during backend initialization = %q, want %q", receivedRoot, root)
	}
	if restored := os.Getenv("GONAVI_DATA_ROOT"); restored != "existing-root" {
		t.Fatalf("GONAVI_DATA_ROOT after invocation = %q, want existing-root", restored)
	}
}

func TestRunQueryForwardsMutatingAcknowledgementAndTimeout(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production", Config: connection.ConnectionConfig{ID: "conn-1", Type: "mysql"}}},
		queryResult: connection.QueryResult{Success: true, Data: []connection.ResultSetData{{Columns: []string{"id"}, Rows: []map[string]any{{"id": 1}}}}},
	}
	code, stdout, stderr := runWithBackend(t, fake,
		"query", "--conn", "production", "--allow-mutating", "--query-timeout", "17", "UPDATE account SET active = 1",
	)
	if code != ExitSuccess {
		t.Fatalf("query exit = %d, stderr=%s", code, stderr)
	}
	if !fake.queryOptions.AllowMutating || fake.queryConfig.QueryTimeout != 17 || !strings.Contains(fake.querySQL, "UPDATE") {
		t.Fatalf("query options not forwarded: %#v, %#v, %q", fake.queryOptions, fake.queryConfig, fake.querySQL)
	}
	if !strings.Contains(stdout, `"success":true`) {
		t.Fatalf("query stdout missing result: %s", stdout)
	}
}

func TestRunQueryDefaultsToJSONLResultSetsRowsAndSummary(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production", Config: connection.ConnectionConfig{ID: "conn-1", Type: "mysql"}}},
		queryResult: connection.QueryResult{
			Success: true,
			QueryID: "query-1",
			Data: []connection.ResultSetData{
				{Columns: []string{"id"}, Rows: []map[string]any{{"id": 1}}},
				{Columns: []string{"name"}, Rows: []map[string]any{{"name": "GoNavi"}}},
			},
		},
	}
	code, stdout, stderr := runWithBackend(t, fake, "query", "--conn", "production", "SELECT 1; SELECT 'GoNavi'")
	if code != ExitSuccess {
		t.Fatalf("query exit = %d, stderr=%s", code, stderr)
	}
	lines := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(lines) != 5 {
		t.Fatalf("JSONL lines = %d, want 5: %s", len(lines), stdout)
	}
	types := make([]string, 0, len(lines))
	for _, line := range lines {
		var event map[string]any
		if err := json.Unmarshal([]byte(line), &event); err != nil {
			t.Fatalf("invalid JSONL event %q: %v", line, err)
		}
		types = append(types, event["type"].(string))
	}
	if got, want := strings.Join(types, ","), "result_set,row,result_set,row,summary"; got != want {
		t.Fatalf("event order = %s, want %s", got, want)
	}
	if !strings.Contains(lines[4], `"queryId":"query-1"`) || !strings.Contains(lines[4], `"resultSets":2`) || !strings.Contains(lines[4], `"rows":2`) {
		t.Fatalf("summary is incomplete: %s", lines[4])
	}
}

func TestRunQueryJSONLSummarizesSuccessfulNonTabularWrite(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production", Config: connection.ConnectionConfig{ID: "conn-1", Type: "mysql"}}},
		queryResult: connection.QueryResult{
			Success: true,
			QueryID: "write-1",
			Data:    map[string]int64{"affectedRows": 3},
		},
	}
	code, stdout, stderr := runWithBackend(t, fake, "query", "--conn", "production", "--allow-write", "UPDATE account SET active = 1")
	if code != ExitSuccess {
		t.Fatalf("query exit = %d, stderr=%s", code, stderr)
	}
	var summary map[string]any
	if err := json.Unmarshal([]byte(strings.TrimSpace(stdout)), &summary); err != nil {
		t.Fatalf("non-tabular JSONL summary is invalid: %v; stdout=%s", err, stdout)
	}
	if summary["type"] != "summary" || summary["success"] != true || summary["queryId"] != "write-1" {
		t.Fatalf("unexpected non-tabular summary: %#v", summary)
	}
	if summary["resultSets"] != float64(0) || summary["rows"] != float64(0) {
		t.Fatalf("unexpected non-tabular counts: %#v", summary)
	}
	data, ok := summary["data"].(map[string]any)
	if !ok || data["affectedRows"] != float64(3) {
		t.Fatalf("affectedRows metadata missing from summary: %#v", summary["data"])
	}
}

func TestRunQueryFormatJSONKeepsEnvelopeCompatibility(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
		queryResult: connection.QueryResult{Success: true, Data: []connection.ResultSetData{{Columns: []string{"id"}, Rows: []map[string]any{{"id": 1}}}}},
	}
	code, stdout, stderr := runWithBackend(t, fake, "query", "--conn", "production", "--format", "json", "SELECT 1")
	if code != ExitSuccess {
		t.Fatalf("query exit = %d, stderr=%s", code, stderr)
	}
	if !strings.Contains(stdout, `"success":true`) || !strings.Contains(stdout, `"data"`) || strings.Contains(stdout, `"type":"summary"`) {
		t.Fatalf("json envelope changed unexpectedly: %s", stdout)
	}
}

func TestRunQueryAcceptsAllowWriteAndLegacyAlias(t *testing.T) {
	for _, flagName := range []string{"--allow-write", "--allow-mutating"} {
		t.Run(flagName, func(t *testing.T) {
			fake := &fakeBackend{
				connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
				queryResult: connection.QueryResult{Success: true, Data: []connection.ResultSetData{}},
			}
			code, _, stderr := runWithBackend(t, fake, "query", "--conn", "production", flagName, "UPDATE account SET active = 1")
			if code != ExitSuccess || !fake.queryOptions.AllowMutating {
				t.Fatalf("query exit=%d allow=%t stderr=%s", code, fake.queryOptions.AllowMutating, stderr)
			}
		})
	}
}

func TestRunQueryUsesTemporaryConnectionFileWithoutSavedConnectionLookup(t *testing.T) {
	path := filepath.Join(t.TempDir(), "temporary-connection.json")
	contents := []byte(`{"type":"postgres","host":"db.example.test","port":5432,"user":"cli","password":"temporary-secret","database":"app"}`)
	if err := os.WriteFile(path, contents, 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Chmod(path, 0o600); err != nil {
		t.Fatal(err)
	}
	fake := &fakeBackend{
		queryResult: connection.QueryResult{Success: true, Data: []connection.ResultSetData{}},
	}
	code, _, stderr := runWithBackend(t, fake, "query", "--connection-file", path, "SELECT 1")
	if code != ExitSuccess {
		t.Fatalf("query exit=%d stderr=%s", code, stderr)
	}
	if fake.queryConfig.ID != "" || fake.queryConfig.SavePassword || fake.queryConfig.Password != "temporary-secret" || fake.queryConfig.Type != "postgres" {
		t.Fatalf("temporary config was not isolated: %#v", fake.queryConfig)
	}
	if fake.resolveCalls != 0 || fake.saveCalls != 0 {
		t.Fatalf("temporary config touched saved connections: resolve=%d save=%d", fake.resolveCalls, fake.saveCalls)
	}
}

func TestRunConnectionAddKeepsSensitiveConnectionParamsOutOfArgv(t *testing.T) {
	t.Run("rejects sensitive argv parameters without leaking them", func(t *testing.T) {
		fake := &fakeBackend{}
		code, _, stderr := runWithBackend(t, fake,
			"connection", "add", "--name", "production", "--type", "postgres",
			"--connection-params", "application_name=gonavi&password=argv-secret",
		)
		if code != ExitUsage || fake.saveCalls != 0 {
			t.Fatalf("connection add exit=%d saves=%d stderr=%s", code, fake.saveCalls, stderr)
		}
		if !strings.Contains(stderr, "--connection-params-env") || strings.Contains(stderr, "argv-secret") {
			t.Fatalf("sensitive argv rejection leaked or omitted remediation: %s", stderr)
		}
	})

	t.Run("accepts public argv parameters", func(t *testing.T) {
		fake := &fakeBackend{}
		code, _, stderr := runWithBackend(t, fake,
			"connection", "add", "--name", "production", "--type", "postgres",
			"--connection-params", "application_name=gonavi&connect_timeout=10",
		)
		if code != ExitSuccess || fake.saveCalls != 1 {
			t.Fatalf("connection add exit=%d saves=%d stderr=%s", code, fake.saveCalls, stderr)
		}
	})

	t.Run("accepts complete sensitive parameters from environment", func(t *testing.T) {
		t.Setenv("GONAVI_CLI_CONNECTION_PARAMS", "application_name=gonavi&password=environment-secret")
		fake := &fakeBackend{}
		code, _, stderr := runWithBackend(t, fake,
			"connection", "add", "--name", "production", "--type", "postgres",
			"--connection-params-env", "GONAVI_CLI_CONNECTION_PARAMS",
		)
		if code != ExitSuccess || fake.saveCalls != 1 {
			t.Fatalf("connection add exit=%d saves=%d stderr=%s", code, fake.saveCalls, stderr)
		}
		if got := fake.savedConnectionParams; got != "application_name=gonavi&password=environment-secret" {
			t.Fatalf("connection parameters from environment = %q", got)
		}
	})

	t.Run("rejects conflicting direct and environment sources", func(t *testing.T) {
		t.Setenv("GONAVI_CLI_CONNECTION_PARAMS", "password=environment-secret")
		fake := &fakeBackend{}
		code, _, stderr := runWithBackend(t, fake,
			"connection", "add", "--name", "production", "--type", "postgres",
			"--connection-params", "application_name=gonavi",
			"--connection-params-env", "GONAVI_CLI_CONNECTION_PARAMS",
		)
		if code != ExitUsage || fake.saveCalls != 0 || !strings.Contains(stderr, "either --connection-params or --connection-params-env") {
			t.Fatalf("conflicting parameter sources exit=%d saves=%d stderr=%s", code, fake.saveCalls, stderr)
		}
	})
}

func TestLoadTemporaryConnectionConfigRejectsInsecurePermissions(t *testing.T) {
	if cliGOOS() == "windows" {
		t.Skip("Windows ACLs are not represented by os.FileMode")
	}
	path := filepath.Join(t.TempDir(), "temporary-connection.json")
	if err := os.WriteFile(path, []byte(`{"type":"mysql"}`), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Chmod(path, 0o644); err != nil {
		t.Fatal(err)
	}
	_, err := loadTemporaryConnectionConfig(path)
	if err == nil || !strings.Contains(err.Error(), "permissions") {
		t.Fatalf("loadTemporaryConnectionConfig error = %v, want permission rejection", err)
	}

	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake, "query", "--connection-file", path, "SELECT 1")
	if code != ExitConnection || fake.querySQL != "" || !strings.Contains(stderr, `"code":"connection_file_invalid"`) {
		t.Fatalf("insecure connection file exit=%d sql=%q stderr=%s", code, fake.querySQL, stderr)
	}
}

func TestLoadTemporaryConnectionConfigAccepts0600AndRejectsSymlink(t *testing.T) {
	if cliGOOS() == "windows" {
		t.Skip("Windows ACLs and symlinks differ from POSIX mode checks")
	}
	directory := t.TempDir()
	path := filepath.Join(directory, "temporary-connection.json")
	if err := os.WriteFile(path, []byte(`{"type":"mysql","password":"temporary-secret"}`), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Chmod(path, 0o600); err != nil {
		t.Fatal(err)
	}
	config, err := loadTemporaryConnectionConfig(path)
	if err != nil || config.Password != "temporary-secret" {
		t.Fatalf("0600 connection file = %#v, %v", config, err)
	}

	linkPath := filepath.Join(directory, "connection-link.json")
	if err := os.Symlink(path, linkPath); err != nil {
		t.Fatal(err)
	}
	if _, err := loadTemporaryConnectionConfig(linkPath); err == nil || !strings.Contains(err.Error(), "symbolic link") {
		t.Fatalf("symlink error = %v, want rejection", err)
	}
}

func TestRunQueryRejectsConnectionSelectorAndFileTogether(t *testing.T) {
	path := filepath.Join(t.TempDir(), "temporary-connection.json")
	if err := os.WriteFile(path, []byte(`{"type":"mysql"}`), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Chmod(path, 0o600); err != nil {
		t.Fatal(err)
	}
	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake, "query", "--conn", "saved", "--connection-file", path, "SELECT 1")
	if code != ExitUsage || fake.querySQL != "" || fake.resolveCalls != 0 {
		t.Fatalf("query exit=%d sql=%q resolve=%d stderr=%s", code, fake.querySQL, fake.resolveCalls, stderr)
	}
	if !strings.Contains(stderr, `"code":"usage"`) {
		t.Fatalf("connection source conflict was not a usage error: %s", stderr)
	}
}

func TestRunHelpUsesAllowWriteAsPrimaryFlag(t *testing.T) {
	for _, args := range [][]string{{"query", "--help"}, {"batch", "--help"}} {
		var stdout bytes.Buffer
		var stderr bytes.Buffer
		if code := Run(context.Background(), args, &stdout, &stderr); code != ExitSuccess {
			t.Fatalf("Run(%v) = %d, stderr=%s", args, code, stderr.String())
		}
		if !strings.Contains(stdout.String(), "--allow-write") || strings.Contains(stdout.String(), "--allow-mutating") {
			t.Fatalf("help did not make --allow-write primary: %s", stdout.String())
		}
	}
}

func TestRunQueryRejectsInvalidFormatBeforeExecution(t *testing.T) {
	fake := &fakeBackend{connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}}}
	code, _, stderr := runWithBackend(t, fake, "query", "--conn", "production", "--format", "xlsx", "SELECT 1")
	if code != ExitUsage || fake.querySQL != "" {
		t.Fatalf("query exit=%d sql=%q stderr=%s", code, fake.querySQL, stderr)
	}
}

func TestRunQueryReportsAmbiguousConnectionWithoutExecutingSQL(t *testing.T) {
	fake := &fakeBackend{
		resolveErr: &appcore.AmbiguousConnectionNameError{Name: "production", IDs: []string{"conn-1", "conn-2"}},
	}
	code, _, stderr := runWithBackend(t, fake, "query", "--conn", "production", "SELECT 1")
	if code != ExitConnection || fake.querySQL != "" {
		t.Fatalf("query exit=%d sql=%q stderr=%s", code, fake.querySQL, stderr)
	}
	if !strings.Contains(stderr, `"code":"connection_ambiguous"`) || !strings.Contains(stderr, "conn-1") || !strings.Contains(stderr, "conn-2") {
		t.Fatalf("ambiguous connection report lost structured candidates: %s", stderr)
	}
}

func TestRunQuerySanitizesFailure(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
		queryResult: connection.QueryResult{Success: false, Message: "connect postgres://alice:driver-secret@example.test/db password=top-secret"},
	}
	code, _, stderr := runWithBackend(t, fake, "query", "--conn", "production", "SELECT 1")
	if code != ExitExecution {
		t.Fatalf("query exit = %d, stderr=%s", code, stderr)
	}
	if strings.Contains(stderr, "driver-secret") || strings.Contains(stderr, "top-secret") {
		t.Fatalf("secret leaked in stderr: %s", stderr)
	}
}

func TestRunQueryMapsStructuredPolicyFailureToExitFour(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
		queryResult: connection.QueryResult{
			Success: false,
			Message: "SQL is blocked by AI safety level readonly",
			Data:    map[string]any{"errorKind": "policy"},
		},
	}
	code, _, stderr := runWithBackend(t, fake, "query", "--conn", "production", "--allow-write", "UPDATE account SET active = 1")
	if code != ExitPolicyDenied || !strings.Contains(stderr, `"code":"policy_denied"`) {
		t.Fatalf("query policy exit=%d stderr=%s", code, stderr)
	}
}

func TestRunBatchRequiresAcknowledgementBeforeFileOrConnectionAccess(t *testing.T) {
	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake, "batch", "--conn", "production", "--file", "/missing.sql")
	if code != ExitPolicyDenied {
		t.Fatalf("batch exit = %d, stderr=%s", code, stderr)
	}
	if fake.batchFile != "" {
		t.Fatalf("batch unexpectedly executed %q", fake.batchFile)
	}
}

func TestRunBatchUnknownOutcomeHasDedicatedExitCode(t *testing.T) {
	directory := t.TempDir()
	filePath := filepath.Join(directory, "migration.sql")
	if err := os.WriteFile(filePath, []byte("UPDATE account SET active = 1;"), 0o600); err != nil {
		t.Fatal(err)
	}
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production", Config: connection.ConnectionConfig{ID: "conn-1"}}},
		batchResult: connection.QueryResult{Success: false, Message: "connection dropped after dispatch", Data: map[string]any{"outcomeUnknown": true}},
	}
	code, _, stderr := runWithBackend(t, fake, "batch", "--conn", "production", "--file", filePath, "--allow-mutating", "--stop-on-error")
	if code != ExitUnknownOutcome || !strings.Contains(stderr, `"code":"outcome_unknown"`) {
		t.Fatalf("batch exit=%d stderr=%s", code, stderr)
	}
	if !fake.batchOptions.AllowMutating || fake.batchOptions.TransactionMode != appcore.HeadlessSQLTransactionModeSingle || fake.batchFile != filePath {
		t.Fatalf("batch options not forwarded: %#v file=%q", fake.batchOptions, fake.batchFile)
	}
}

func TestFailResultUsesStructuredCancellationAndPreservesUnknownOutcomePriority(t *testing.T) {
	tests := []struct {
		name     string
		data     map[string]any
		wantExit int
		wantCode string
	}{
		{
			name:     "cancelled",
			data:     map[string]any{"cancelled": true},
			wantExit: ExitCancelled,
			wantCode: `"code":"cancelled"`,
		},
		{
			name:     "unknown outcome after cancellation",
			data:     map[string]any{"cancelled": true, "outcomeUnknown": true},
			wantExit: ExitUnknownOutcome,
			wantCode: `"code":"outcome_unknown"`,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			var stderr bytes.Buffer
			code := failResult(context.Background(), &stderr, connection.QueryResult{
				Success: false,
				Message: "执行已取消",
				Data:    test.data,
			})
			if code != test.wantExit || !strings.Contains(stderr.String(), test.wantCode) {
				t.Fatalf("failResult exit=%d stderr=%s, want exit=%d code=%s", code, stderr.String(), test.wantExit, test.wantCode)
			}
		})
	}
}

func TestFailResultPrefersStructuredPolicyOverCancellationText(t *testing.T) {
	var stderr bytes.Buffer
	result := connection.QueryResult{
		Success: false,
		Message: "policy denied: cancellation command is not permitted",
		Data:    map[string]any{"errorKind": "policy"},
	}
	if code := failResult(context.Background(), &stderr, result); code != ExitPolicyDenied {
		t.Fatalf("failResult exit=%d stderr=%s, want policy exit=%d", code, stderr.String(), ExitPolicyDenied)
	}
	if !strings.Contains(stderr.String(), `"code":"policy_denied"`) {
		t.Fatalf("structured policy code missing: %s", stderr.String())
	}
}

func TestFailResultMapsStructuredConnectionFailure(t *testing.T) {
	var stderr bytes.Buffer
	result := connection.QueryResult{
		Success: false,
		Message: "authentication failed",
		Data:    map[string]any{"errorKind": "connection"},
	}
	if code := failResult(context.Background(), &stderr, result); code != ExitConnection {
		t.Fatalf("failResult exit=%d stderr=%s, want connection exit=%d", code, stderr.String(), ExitConnection)
	}
	if !strings.Contains(stderr.String(), `"code":"connection_failed"`) {
		t.Fatalf("structured connection code missing: %s", stderr.String())
	}
}

func TestFailResultDoesNotTreatOrdinaryCancellationTextAsCancellation(t *testing.T) {
	var stderr bytes.Buffer
	result := connection.QueryResult{
		Success: false,
		Message: `column "cancellation_reason" does not exist`,
	}
	if code := failResult(context.Background(), &stderr, result); code != ExitExecution {
		t.Fatalf("failResult exit=%d stderr=%s, want execution exit=%d", code, stderr.String(), ExitExecution)
	}
	if !strings.Contains(stderr.String(), `"code":"execution_failed"`) {
		t.Fatalf("ordinary database error was not classified as execution failure: %s", stderr.String())
	}
}

func TestRunBatchOnlyAllowsContinueOnErrorWithTransactionOff(t *testing.T) {
	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake,
		"batch", "--conn", "production", "--file", "/missing.sql", "--allow-write", "--continue-on-error",
	)
	if code != ExitUsage || fake.batchFile != "" || !strings.Contains(stderr, "--transaction=off") {
		t.Fatalf("batch exit=%d file=%q stderr=%s", code, fake.batchFile, stderr)
	}
}

func TestRunBatchForwardsTransactionOff(t *testing.T) {
	directory := t.TempDir()
	filePath := filepath.Join(directory, "migration.sql")
	if err := os.WriteFile(filePath, []byte("UPDATE account SET active = 1;"), 0o600); err != nil {
		t.Fatal(err)
	}
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
		batchResult: connection.QueryResult{Success: true},
	}
	code, _, stderr := runWithBackend(t, fake,
		"batch", "--conn", "production", "--file", filePath, "--allow-write", "--transaction=off", "--continue-on-error",
	)
	if code != ExitSuccess || !fake.batchOptions.ContinueOnError || fake.batchOptions.TransactionMode != appcore.HeadlessSQLTransactionModeOff {
		t.Fatalf("batch exit=%d options=%#v stderr=%s", code, fake.batchOptions, stderr)
	}
}

func TestRunAuditExportParsesTimestampAndFilters(t *testing.T) {
	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake,
		"audit", "export", "--output", "audit.json", "--source", "cli", "--from", "2026-08-10T00:00:00Z", "--to", "123",
	)
	if code != ExitSuccess {
		t.Fatalf("audit exit=%d stderr=%s", code, stderr)
	}
	if fake.auditFormat != "json" || fake.auditPath != "audit.json" || fake.auditFilter.Source != "cli" || fake.auditFilter.FromTimestamp == 0 || fake.auditFilter.ToTimestamp != 123 {
		t.Fatalf("audit args not forwarded: format=%q path=%q filter=%#v", fake.auditFormat, fake.auditPath, fake.auditFilter)
	}
}

func TestRunAuditExportRejectsUnsupportedFormatBeforeBackendCall(t *testing.T) {
	fake := &fakeBackend{}
	code, _, stderr := runWithBackend(t, fake, "audit", "export", "--output", "audit.out", "--format", "yaml")
	if code != ExitUsage {
		t.Fatalf("audit exit=%d stderr=%s, want usage exit=%d", code, stderr, ExitUsage)
	}
	if fake.auditFormat != "" {
		t.Fatalf("unsupported audit format reached backend: %q", fake.auditFormat)
	}
	if !strings.Contains(stderr, `"code":"usage"`) {
		t.Fatalf("unsupported audit format was not reported as usage error: %s", stderr)
	}
}

func TestRunMCPMapsInvocationTerminationToCancelledExit(t *testing.T) {
	t.Run("stdio cancellation error", func(t *testing.T) {
		previousStdio := runMCPStdioServer
		t.Cleanup(func() { runMCPStdioServer = previousStdio })
		ctx, cancel := context.WithCancel(context.Background())
		cancel()
		runMCPStdioServer = func(received context.Context) error {
			if received != ctx {
				t.Fatal("stdio runner received a different invocation context")
			}
			return received.Err()
		}

		var stdout bytes.Buffer
		var stderr bytes.Buffer
		if code := runMCP(ctx, []string{"stdio"}, &stdout, &stderr); code != ExitCancelled || !strings.Contains(stderr.String(), `"code":"cancelled"`) {
			t.Fatalf("stdio cancellation exit=%d stdout=%s stderr=%s", code, stdout.String(), stderr.String())
		}
	})

	t.Run("http graceful deadline shutdown", func(t *testing.T) {
		previousHTTP := runMCPHTTPServer
		t.Cleanup(func() { runMCPHTTPServer = previousHTTP })
		ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(-time.Second))
		defer cancel()
		runMCPHTTPServer = func(received context.Context, _ mcpserver.HTTPServerOptions) error {
			if received != ctx {
				t.Fatal("http runner received a different invocation context")
			}
			// The real HTTP server treats a context-triggered graceful shutdown as
			// a nil server error, which must still map to ExitCancelled.
			return nil
		}

		var stdout bytes.Buffer
		var stderr bytes.Buffer
		if code := runMCP(ctx, []string{"http", "--token", "test-token"}, &stdout, &stderr); code != ExitCancelled || !strings.Contains(stderr.String(), `"code":"cancelled"`) {
			t.Fatalf("http deadline exit=%d stdout=%s stderr=%s", code, stdout.String(), stderr.String())
		}
	})

	t.Run("ordinary server failure remains execution failure", func(t *testing.T) {
		previousStdio := runMCPStdioServer
		t.Cleanup(func() { runMCPStdioServer = previousStdio })
		runMCPStdioServer = func(context.Context) error { return errors.New("MCP transport failed") }
		var stdout bytes.Buffer
		var stderr bytes.Buffer
		if code := runMCP(context.Background(), nil, &stdout, &stderr); code != ExitExecution || !strings.Contains(stderr.String(), `"code":"mcp_failed"`) {
			t.Fatalf("MCP failure exit=%d stdout=%s stderr=%s", code, stdout.String(), stderr.String())
		}
	})
}

type failingWriter struct {
	err error
}

func (writer failingWriter) Write([]byte) (int, error) {
	return 0, writer.err
}

func TestRunReportsStdoutWriteFailureOnStderr(t *testing.T) {
	fake := &fakeBackend{
		connections: []connection.SavedConnectionView{{ID: "conn-1", Name: "production"}},
		queryResult: connection.QueryResult{
			Success: true,
			Data:    []connection.ResultSetData{{Columns: []string{"id"}, Rows: []map[string]any{{"id": 1}}}},
		},
	}
	previous := newBackend
	newBackend = func(context.Context, appcore.HeadlessRuntimeOptions) (backend, error) {
		return fake, nil
	}
	t.Cleanup(func() { newBackend = previous })

	var stderr bytes.Buffer
	code := Run(context.Background(), []string{"query", "--conn", "production", "SELECT 1"}, failingWriter{err: errors.New("stdout sink unavailable")}, &stderr)
	if code != ExitExecution {
		t.Fatalf("query exit=%d stderr=%s, want execution exit=%d", code, stderr.String(), ExitExecution)
	}
	if !strings.Contains(stderr.String(), `"code":"output_failed"`) || !strings.Contains(stderr.String(), "stdout sink unavailable") {
		t.Fatalf("stdout failure did not produce a structured stderr diagnostic: %s", stderr.String())
	}
}