package executor

import (
	"context"
	"encoding/json"
	"fmt"
	"net"
	"net/http"
	"net/http/httptest"
	"net/url"
	"reflect"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/gorilla/websocket"
	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
	internalhome "github.com/router-for-me/CLIProxyAPI/v7/internal/home"
	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
	"github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executionregistry"
	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
)

type rejectSecondBindLifecycle struct {
	binds atomic.Int32
}

func (l *rejectSecondBindLifecycle) Bind(func() error) error {
	if l.binds.Add(1) > 1 {
		return fmt.Errorf("retry lifecycle bind rejected")
	}
	return nil
}

func (*rejectSecondBindLifecycle) End(string) {}

func TestCodexWebsocketSessionActiveChannelBelongsToConnection(t *testing.T) {
	sess := &codexWebsocketSession{}
	oldConn := &websocket.Conn{}
	newConn := &websocket.Conn{}
	oldCh := make(chan codexWebsocketRead, 1)
	newCh := make(chan codexWebsocketRead, 1)

	sess.setActive(oldConn, oldCh)
	if ch, _ := sess.activeForConn(oldConn); ch != oldCh {
		t.Fatal("old connection did not own its active channel")
	}

	sess.setActive(newConn, newCh)
	if sess.clearActive(oldConn, oldCh) {
		t.Fatal("old connection cleared the new active channel")
	}
	if ch, _ := sess.activeForConn(oldConn); ch != nil {
		t.Fatal("old connection retained access to an active channel")
	}
	if ch, _ := sess.activeForConn(newConn); ch != newCh {
		t.Fatal("new connection lost its active channel")
	}
	if !sess.clearActive(newConn, newCh) {
		t.Fatal("new connection could not clear its active channel")
	}

	closedOldCh := sess.activate(oldConn)
	if !sess.clearActive(oldConn, closedOldCh) {
		t.Fatal("old connection could not clear its active channel before retry")
	}
	close(closedOldCh)
	retryCh := sess.activate(newConn)
	if retryCh == closedOldCh {
		t.Fatal("retry reused the old connection's read channel")
	}
	select {
	case retryCh <- codexWebsocketRead{conn: newConn}:
	default:
		t.Fatal("retry read channel was not writable")
	}
}

type trackedWebsocketLifecycle struct {
	mu    sync.Mutex
	close func() error
	once  sync.Once
	ends  atomic.Int32
}

type drainDuringBindWebsocketLifecycle struct{}

func (drainDuringBindWebsocketLifecycle) Bind(closeFn func() error) error {
	if errClose := closeFn(); errClose != nil {
		return errClose
	}
	return fmt.Errorf("execution lifecycle drained during Bind")
}

func (drainDuringBindWebsocketLifecycle) End(string) {}

func (l *trackedWebsocketLifecycle) Bind(closeFn func() error) error {
	l.mu.Lock()
	l.close = closeFn
	l.mu.Unlock()
	return nil
}

func (l *trackedWebsocketLifecycle) End(string) {
	l.once.Do(func() {
		l.ends.Add(1)
		l.mu.Lock()
		closeFn := l.close
		l.mu.Unlock()
		if closeFn != nil {
			_ = closeFn()
		}
	})
}

func TestClearRetryActiveStateClearsOriginalConnection(t *testing.T) {
	sess := &codexWebsocketSession{}
	originalConn := &websocket.Conn{}
	originalCh := sess.activate(originalConn)
	if !clearRetryActiveState(sess, originalConn, originalCh) {
		t.Fatal("clearRetryActiveState() = false, want true")
	}
	if ch, done := sess.activeForConn(originalConn); ch != nil || done != nil {
		t.Fatalf("original active state = %v/%v, want nil", ch, done)
	}
}

func TestWebsocketRetryBindFailureClearsActiveSessionState(t *testing.T) {
	tests := []struct {
		name string
		run  func(t *testing.T, baseURL string) (func(cliproxyexecutor.Options) error, *codexWebsocketSession)
	}{
		{
			name: "Codex nonstream",
			run: func(t *testing.T, baseURL string) (func(cliproxyexecutor.Options) error, *codexWebsocketSession) {
				executor := NewCodexWebsocketsExecutor(&config.Config{SDKConfig: config.SDKConfig{DisableImageGeneration: config.DisableImageGenerationAll}})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				auth := &cliproxyauth.Auth{ID: "retry-bind-codex", Provider: "codex", Attributes: map[string]string{"api_key": "test-key", "base_url": baseURL}}
				req := cliproxyexecutor.Request{Model: "gpt-5-codex", Payload: []byte(`{"model":"gpt-5-codex","input":[{"type":"message","role":"user","content":"hello"}]}`)}
				primed := false
				return func(runOpts cliproxyexecutor.Options) error {
					if !primed {
						wsURL := "ws" + strings.TrimPrefix(baseURL, "http") + "/responses"
						conn, _, _, errEnsure := executor.ensureUpstreamConn(context.Background(), auth, executor.getOrCreateSession("retry-bind"), auth.ID, wsURL, http.Header{})
						if errEnsure != nil {
							return errEnsure
						}
						if errDeadline := conn.SetWriteDeadline(time.Now().Add(-time.Second)); errDeadline != nil {
							return errDeadline
						}
						primed = true
					}
					_, errExecute := executor.Execute(context.Background(), auth, req, runOpts)
					return errExecute
				}, executor.getOrCreateSession("retry-bind")
			},
		},
		{
			name: "Codex stream",
			run: func(t *testing.T, baseURL string) (func(cliproxyexecutor.Options) error, *codexWebsocketSession) {
				executor := NewCodexWebsocketsExecutor(&config.Config{SDKConfig: config.SDKConfig{DisableImageGeneration: config.DisableImageGenerationAll}})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				auth := &cliproxyauth.Auth{ID: "retry-bind-codex", Provider: "codex", Attributes: map[string]string{"api_key": "test-key", "base_url": baseURL}}
				req := cliproxyexecutor.Request{Model: "gpt-5-codex", Payload: []byte(`{"model":"gpt-5-codex","input":[{"type":"message","role":"user","content":"hello"}]}`)}
				primed := false
				return func(runOpts cliproxyexecutor.Options) error {
					if !primed {
						wsURL := "ws" + strings.TrimPrefix(baseURL, "http") + "/responses"
						conn, _, _, errEnsure := executor.ensureUpstreamConn(context.Background(), auth, executor.getOrCreateSession("retry-bind"), auth.ID, wsURL, http.Header{})
						if errEnsure != nil {
							return errEnsure
						}
						if errDeadline := conn.SetWriteDeadline(time.Now().Add(-time.Second)); errDeadline != nil {
							return errDeadline
						}
						primed = true
					}
					result, errExecute := executor.ExecuteStream(context.Background(), auth, req, runOpts)
					if errExecute != nil {
						return errExecute
					}
					for chunk := range result.Chunks {
						if chunk.Err != nil {
							return chunk.Err
						}
					}
					return nil
				}, executor.getOrCreateSession("retry-bind")
			},
		},
		{
			name: "xAI stream",
			run: func(t *testing.T, baseURL string) (func(cliproxyexecutor.Options) error, *codexWebsocketSession) {
				executor := NewXAIWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				auth := &cliproxyauth.Auth{ID: "retry-bind-xai", Provider: "xai", Attributes: map[string]string{"base_url": baseURL, "websockets": "true"}, Metadata: map[string]any{"access_token": "test-token"}}
				req := cliproxyexecutor.Request{Model: "grok-4", Payload: []byte(`{"model":"grok-4","input":[{"type":"message","role":"user","content":"hello"}]}`)}
				primed := false
				return func(runOpts cliproxyexecutor.Options) error {
					if !primed {
						wsURL := "ws" + strings.TrimPrefix(baseURL, "http") + "/responses"
						conn, _, _, errEnsure := executor.ensureUpstreamConn(context.Background(), auth, executor.getOrCreateSession("retry-bind"), auth.ID, wsURL, http.Header{})
						if errEnsure != nil {
							return errEnsure
						}
						if errDeadline := conn.SetWriteDeadline(time.Now().Add(-time.Second)); errDeadline != nil {
							return errDeadline
						}
						primed = true
					}
					result, errExecute := executor.ExecuteStream(context.Background(), auth, req, runOpts)
					if errExecute != nil {
						return errExecute
					}
					for chunk := range result.Chunks {
						if chunk.Err != nil {
							return chunk.Err
						}
					}
					return nil
				}, executor.getOrCreateSession("retry-bind")
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			upgrader := websocket.Upgrader{CheckOrigin: func(*http.Request) bool { return true }}
			var connections atomic.Int32
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				conn, errUpgrade := upgrader.Upgrade(w, r, nil)
				if errUpgrade != nil {
					t.Errorf("upgrade websocket: %v", errUpgrade)
					return
				}
				connection := connections.Add(1)
				defer func() { _ = conn.Close() }()
				if connection == 1 {
					_, _, _ = conn.ReadMessage()
					return
				}
				if connection == 2 {
					return
				}
				if _, _, errRead := conn.ReadMessage(); errRead != nil {
					return
				}
				completed := []byte(`{"type":"response.completed","response":{"id":"response-1","output":[],"usage":{"input_tokens":0,"output_tokens":0,"total_tokens":0}}}`)
				if errWrite := conn.WriteMessage(websocket.TextMessage, completed); errWrite != nil {
					t.Errorf("write websocket completion: %v", errWrite)
				}
			}))
			defer server.Close()

			lifecycle := &rejectSecondBindLifecycle{}
			opts := cliproxyexecutor.Options{SourceFormat: sdktranslator.FormatOpenAIResponse, ResponseFormat: sdktranslator.FormatOpenAIResponse, ExecutionLifecycle: lifecycle, Metadata: map[string]any{cliproxyexecutor.ExecutionSessionMetadataKey: "retry-bind"}}
			run, sess := test.run(t, server.URL)
			if errRun := run(opts); errRun == nil {
				t.Fatal("first request error = nil, want retry lifecycle bind rejection")
			}
			if got := lifecycle.binds.Load(); got != 2 {
				t.Fatalf("lifecycle binds = %d, want 2", got)
			}
			sess.activeMu.Lock()
			active := sess.activeConn != nil || sess.activeCh != nil || sess.activeDone != nil || sess.activeCancel != nil
			sess.activeMu.Unlock()
			if active {
				t.Fatal("retry bind failure left the old active websocket state")
			}

			opts.ExecutionLifecycle = nil
			if errRun := run(opts); errRun != nil {
				t.Fatalf("second request error = %v", errRun)
			}
			if got := connections.Load(); got != 3 {
				t.Fatalf("websocket connections = %d, want 3 after retry bind failure", got)
			}
		})
	}
}

func TestWebsocketSessionCloseEndsRetainedLifecycleOnce(t *testing.T) {
	exec := NewCodexWebsocketsExecutor(&config.Config{})
	exec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
	server, closed := newWebsocketTargetServer(t)
	defer server.Close()

	sess := exec.getOrCreateSession("retained-lifecycle")
	auth := &cliproxyauth.Auth{ID: "auth-a"}
	wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
	conn := ensureWebsocketTargetConn(t, exec.ensureUpstreamConn, auth, sess, auth.ID, wsURL)
	lifecycle := &trackedWebsocketLifecycle{}
	if errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: lifecycle}, conn, sess.connCloser, "model-a"); errBind != nil {
		t.Fatalf("bind execution lifecycle: %v", errBind)
	}

	exec.CloseExecutionSession("retained-lifecycle")
	lifecycle.End("duplicate_close")
	if got := lifecycle.ends.Load(); got != 1 {
		t.Fatalf("lifecycle End calls = %d, want 1", got)
	}
	if got := <-closed; got != auth.ID {
		t.Fatalf("closed server auth = %q, want %q", got, auth.ID)
	}
}

type closeCountingNetConn struct {
	net.Conn
	closes atomic.Int32
}

func (c *closeCountingNetConn) Close() error {
	c.closes.Add(1)
	return c.Conn.Close()
}

func newCloseCountingWebsocketConn(t *testing.T, rawURL string) (*websocket.Conn, *closeCountingNetConn) {
	t.Helper()
	parsed, errParse := url.Parse(rawURL)
	if errParse != nil {
		t.Fatalf("parse websocket URL: %v", errParse)
	}
	conn, errDial := net.Dial("tcp", parsed.Host)
	if errDial != nil {
		t.Fatalf("dial websocket: %v", errDial)
	}
	counting := &closeCountingNetConn{Conn: conn}
	wsConn, _, errClient := websocket.NewClient(counting, parsed, nil, 1024, 1024)
	if errClient != nil {
		_ = counting.Close()
		t.Fatalf("create websocket client: %v", errClient)
	}
	return wsConn, counting
}

func TestSessionlessWebsocketSelectionEndAndDirectCloseRaceClosesOnce(t *testing.T) {
	server, _ := newWebsocketTargetServer(t)
	defer server.Close()

	wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
	conn, physical := newCloseCountingWebsocketConn(t, wsURL)
	closer := newWebsocketConnectionCloser(conn)
	lifecycle := &trackedWebsocketLifecycle{}
	if errBind := (*codexWebsocketSession)(nil).bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: lifecycle}, conn, closer, "model-a"); errBind != nil {
		t.Fatalf("bind sessionless lifecycle: %v", errBind)
	}

	var wait sync.WaitGroup
	wait.Add(2)
	go func() {
		defer wait.Done()
		lifecycle.End("selection_ended")
	}()
	go func() {
		defer wait.Done()
		if errClose := closer.Close(); errClose != nil {
			t.Errorf("direct close: %v", errClose)
		}
	}()
	wait.Wait()

	if got := physical.closes.Load(); got != 1 {
		t.Fatalf("physical websocket closes = %d, want 1", got)
	}
}

func TestWebsocketDrainDuringBindClosesOwnedConnectionOnce(t *testing.T) {
	server, _ := newWebsocketTargetServer(t)
	defer server.Close()

	wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
	conn, physical := newCloseCountingWebsocketConn(t, wsURL)
	closer := newWebsocketConnectionCloser(conn)
	sess := &codexWebsocketSession{conn: conn, connCloser: closer, wsURL: wsURL, authID: "auth-a", readerConn: conn}

	errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: drainDuringBindWebsocketLifecycle{}}, conn, closer, "model-a")
	if errBind == nil {
		t.Fatal("bind execution lifecycle error = nil, want drain error")
	}
	closeWebsocketAfterBindFailure(sess, conn, closer)

	if got := physical.closes.Load(); got != 1 {
		t.Fatalf("physical websocket closes = %d, want 1", got)
	}
	sess.connMu.Lock()
	defer sess.connMu.Unlock()
	if sess.conn != nil || sess.connCloser != nil || sess.lifecycle != nil {
		t.Fatalf("drained session state = conn:%v closer:%v lifecycle:%v, want detached", sess.conn, sess.connCloser, sess.lifecycle)
	}
}

func TestWebsocketTargetReplacementPhysicallyClosesOwnedConnectionOnce(t *testing.T) {
	tests := []struct {
		name string
	}{
		{name: "Codex"},
		{name: "xAI"},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			serverA, _ := newWebsocketTargetServer(t)
			defer serverA.Close()
			serverB, _ := newWebsocketTargetServer(t)
			defer serverB.Close()

			var ensure func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error)
			var closeSession func(string)
			var sess *codexWebsocketSession
			switch test.name {
			case "Codex":
				exec := NewCodexWebsocketsExecutor(&config.Config{})
				exec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				ensure = exec.ensureUpstreamConn
				closeSession = exec.CloseExecutionSession
				sess = exec.getOrCreateSession("counted-target-change")
			case "xAI":
				exec := NewXAIWebsocketsExecutor(&config.Config{})
				exec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				ensure = exec.ensureUpstreamConn
				closeSession = exec.CloseExecutionSession
				sess = exec.getOrCreateSession("counted-target-change")
			}
			defer closeSession("counted-target-change")

			wsURLA := "ws" + strings.TrimPrefix(serverA.URL, "http")
			wsURLB := "ws" + strings.TrimPrefix(serverB.URL, "http")
			connA, physical := newCloseCountingWebsocketConn(t, wsURLA)
			sess.connMu.Lock()
			sess.conn = connA
			sess.connCloser = newWebsocketConnectionCloser(connA)
			sess.wsURL = wsURLA
			sess.authID = "auth-a"
			sess.readerConn = connA
			sess.connMu.Unlock()
			lifecycle := &trackedWebsocketLifecycle{}
			if errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: lifecycle}, connA, sess.connCloser, "model-a"); errBind != nil {
				t.Fatalf("bind execution lifecycle: %v", errBind)
			}

			if _, _, _, errEnsure := ensure(context.Background(), &cliproxyauth.Auth{ID: "auth-b"}, sess, "auth-b", wsURLB, nil); errEnsure != nil {
				t.Fatalf("replace websocket target: %v", errEnsure)
			}
			if got := physical.closes.Load(); got != 1 {
				t.Fatalf("physical websocket closes = %d, want 1", got)
			}
		})
	}
}

func TestWebsocketLifecycleEndThenInvalidateAndCloseAllPhysicallyClosesOnce(t *testing.T) {
	tests := []struct {
		name string
		run  func(*codexWebsocketSession, *websocket.Conn, *trackedWebsocketLifecycle)
	}{
		{
			name: "Codex",
			run: func(sess *codexWebsocketSession, conn *websocket.Conn, lifecycle *trackedWebsocketLifecycle) {
				exec := NewCodexWebsocketsExecutor(&config.Config{})
				exec.store = &codexWebsocketSessionStore{sessions: map[string]*codexWebsocketSession{sess.sessionID: sess}}
				lifecycle.End("lifecycle_ended")
				exec.invalidateUpstreamConn(sess, conn, "invalidated", nil)
				exec.CloseExecutionSession(cliproxyauth.CloseAllExecutionSessionsID)
			},
		},
		{
			name: "xAI",
			run: func(sess *codexWebsocketSession, conn *websocket.Conn, lifecycle *trackedWebsocketLifecycle) {
				exec := NewXAIWebsocketsExecutor(&config.Config{})
				exec.store = &codexWebsocketSessionStore{sessions: map[string]*codexWebsocketSession{sess.sessionID: sess}}
				lifecycle.End("lifecycle_ended")
				exec.invalidateUpstreamConn(sess, conn, "invalidated", nil)
				exec.CloseExecutionSession(cliproxyauth.CloseAllExecutionSessionsID)
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			server, _ := newWebsocketTargetServer(t)
			defer server.Close()
			wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
			conn, physical := newCloseCountingWebsocketConn(t, wsURL)
			sess := &codexWebsocketSession{sessionID: "counted-lifecycle", conn: conn, connCloser: newWebsocketConnectionCloser(conn), wsURL: wsURL, authID: "auth-a", readerConn: conn}
			lifecycle := &trackedWebsocketLifecycle{}
			if errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: lifecycle}, conn, sess.connCloser, "model-a"); errBind != nil {
				t.Fatalf("bind execution lifecycle: %v", errBind)
			}

			test.run(sess, conn, lifecycle)
			if got := physical.closes.Load(); got != 1 {
				t.Fatalf("physical websocket closes = %d, want 1", got)
			}
		})
	}
}

func TestWebsocketExecutorsReconnectWhenSessionTargetChanges(t *testing.T) {
	t.Run("Codex", func(t *testing.T) {
		exec := NewCodexWebsocketsExecutor(&config.Config{})
		exec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
		testWebsocketExecutorReconnectsWhenSessionTargetChanges(
			t,
			exec.UpstreamDisconnectChan,
			exec.getOrCreateSession,
			exec.ensureUpstreamConn,
			exec.CloseExecutionSession,
		)
	})

	t.Run("xAI", func(t *testing.T) {
		exec := NewXAIWebsocketsExecutor(&config.Config{})
		exec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
		testWebsocketExecutorReconnectsWhenSessionTargetChanges(
			t,
			exec.UpstreamDisconnectChan,
			exec.getOrCreateSession,
			exec.ensureUpstreamConn,
			exec.CloseExecutionSession,
		)
	})
}

func testWebsocketExecutorReconnectsWhenSessionTargetChanges(
	t *testing.T,
	disconnectChan func(string) <-chan error,
	getSession func(string) *codexWebsocketSession,
	ensureConn func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error),
	closeSession func(string),
) {
	t.Helper()

	serverA, closedA := newWebsocketTargetServer(t)
	defer serverA.Close()
	serverB, closedB := newWebsocketTargetServer(t)
	defer serverB.Close()

	sessionID := "target-switch-session"
	disconnectCh := disconnectChan(sessionID)
	sess := getSession(sessionID)
	if sess == nil {
		t.Fatal("expected websocket session")
	}
	defer closeSession(sessionID)

	authA := &cliproxyauth.Auth{ID: "auth-a"}
	authB := &cliproxyauth.Auth{ID: "auth-b"}
	wsURLA := "ws" + strings.TrimPrefix(serverA.URL, "http")
	wsURLB := "ws" + strings.TrimPrefix(serverB.URL, "http")

	connA := ensureWebsocketTargetConn(t, ensureConn, authA, sess, authA.ID, wsURLA)
	connAReused := ensureWebsocketTargetConn(t, ensureConn, authA, sess, authA.ID, wsURLA)
	if connAReused != connA {
		t.Fatal("matching websocket target did not reuse the existing connection")
	}

	connURLB := ensureWebsocketTargetConn(t, ensureConn, authA, sess, authA.ID, wsURLB)
	if connURLB == connA {
		t.Fatal("websocket URL change reused the existing connection")
	}
	if got := <-closedA; got != authA.ID {
		t.Fatalf("closed server A auth = %q, want %q", got, authA.ID)
	}

	connAuthB := ensureWebsocketTargetConn(t, ensureConn, authB, sess, authB.ID, wsURLB)
	if connAuthB == connURLB {
		t.Fatal("websocket auth change reused the existing connection")
	}
	if got := <-closedB; got != authA.ID {
		t.Fatalf("first closed server B auth = %q, want %q", got, authA.ID)
	}

	sess.connMu.Lock()
	gotAuthID := sess.authID
	gotURL := sess.wsURL
	sess.connMu.Unlock()
	if gotAuthID != authB.ID || gotURL != wsURLB {
		t.Fatalf("session target = {%q %q}, want {%q %q}", gotAuthID, gotURL, authB.ID, wsURLB)
	}

	select {
	case errDisconnect := <-disconnectCh:
		t.Fatalf("controlled websocket target switch notified downstream: %v", errDisconnect)
	default:
	}
}

func ensureWebsocketTargetConn(
	t *testing.T,
	ensureConn func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error),
	auth *cliproxyauth.Auth,
	sess *codexWebsocketSession,
	authID string,
	wsURL string,
) *websocket.Conn {
	t.Helper()
	headers := http.Header{"X-Test-Auth": []string{authID}}
	conn, _, resp, errEnsure := ensureConn(context.Background(), auth, sess, authID, wsURL, headers)
	if resp != nil && resp.Body != nil {
		defer func() {
			if errClose := resp.Body.Close(); errClose != nil {
				t.Errorf("close handshake response body: %v", errClose)
			}
		}()
	}
	if errEnsure != nil {
		t.Fatalf("ensure websocket connection: %v", errEnsure)
	}
	if conn == nil {
		t.Fatal("ensure websocket connection returned nil")
	}
	return conn
}

func newWebsocketTargetServer(t *testing.T) (*httptest.Server, <-chan string) {
	t.Helper()
	closed := make(chan string, 4)
	upgrader := websocket.Upgrader{CheckOrigin: func(*http.Request) bool { return true }}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		authID := r.Header.Get("X-Test-Auth")
		conn, errUpgrade := upgrader.Upgrade(w, r, nil)
		if errUpgrade != nil {
			t.Errorf("upgrade websocket: %v", errUpgrade)
			return
		}
		defer func() {
			if errClose := conn.Close(); errClose != nil {
				t.Errorf("close upstream websocket: %v", errClose)
			}
			closed <- authID
		}()
		for {
			if _, _, errRead := conn.ReadMessage(); errRead != nil {
				return
			}
		}
	}))
	return server, closed
}

type registryDrainWebsocketLifecycle struct {
	scope *executionregistry.Scope
	ends  atomic.Int32
}

func (l *registryDrainWebsocketLifecycle) Bind(closeFn func() error) error {
	return l.scope.Bind(closeFn)
}

func (l *registryDrainWebsocketLifecycle) End(string) {
	l.ends.Add(1)
	l.scope.End("websocket_closed")
}

func (l *registryDrainWebsocketLifecycle) Retain() {}

type websocketHomeDispatcher struct {
	provider string
}

func (d websocketHomeDispatcher) HeartbeatOK() bool { return true }

func (d websocketHomeDispatcher) RPopAuth(context.Context, string, string, http.Header, int) ([]byte, error) {
	return json.Marshal(map[string]any{"auth": map[string]any{
		"id":       "home-websocket-auth",
		"provider": d.provider,
		"status":   "active",
		"attributes": map[string]string{
			"api_key": "home-key",
		},
	}})
}

func (websocketHomeDispatcher) AbortAmbiguousDispatch() {}

type accountedWebsocketHomeDispatcher struct {
	provider string
	baseURL  string
	calls    atomic.Int32
	releases atomic.Int32
	before   atomic.Bool
}

func (*accountedWebsocketHomeDispatcher) HeartbeatOK() bool { return true }

func (d *accountedWebsocketHomeDispatcher) RPopAuth(_ context.Context, model string, _ string, _ http.Header, _ int) ([]byte, error) {
	call := d.calls.Add(1)
	if call > 1 && d.releases.Load() != call-1 {
		d.before.Store(false)
	} else if call > 1 {
		d.before.Store(true)
	}
	upstreamModel := "model-a"
	if strings.Contains(strings.ToLower(model), "(custom)") {
		upstreamModel = "model-a(custom)"
	}
	return json.Marshal(map[string]any{
		"model":      upstreamModel,
		"auth_index": "accounted-websocket-auth",
		"auth": map[string]any{
			"id":       "accounted-websocket-auth",
			"provider": d.provider,
			"status":   "active",
			"attributes": map[string]string{
				"api_key":    "test-key",
				"base_url":   d.baseURL,
				"websockets": "true",
			},
		},
		"concurrency": map[string]any{
			"accounted":     true,
			"credential_id": "accounted-websocket-auth",
			"model":         upstreamModel,
		},
	})
}

func (*accountedWebsocketHomeDispatcher) AbortAmbiguousDispatch() {}

func TestAuditAccountedCodexXAIReconnectReuseAndTargetChange(t *testing.T) {
	tests := []struct {
		name        string
		provider    string
		newExecutor func() cliproxyauth.ProviderExecutor
	}{
		{
			name:     "Codex",
			provider: "codex",
			newExecutor: func() cliproxyauth.ProviderExecutor {
				executor := NewCodexWebsocketsExecutor(&config.Config{SDKConfig: config.SDKConfig{DisableImageGeneration: config.DisableImageGenerationAll}})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				return executor
			},
		},
		{
			name:     "xAI",
			provider: "xai",
			newExecutor: func() cliproxyauth.ProviderExecutor {
				executor := NewXAIWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				executor.idStore = &xaiWebsocketIDStateStore{sessions: make(map[string]*xaiWebsocketIDState)}
				return executor
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			upgrader := websocket.Upgrader{CheckOrigin: func(*http.Request) bool { return true }}
			var connections atomic.Int32
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				conn, errUpgrade := upgrader.Upgrade(w, r, nil)
				if errUpgrade != nil {
					t.Errorf("upgrade websocket: %v", errUpgrade)
					return
				}
				connections.Add(1)
				defer func() { _ = conn.Close() }()
				for {
					if _, _, errRead := conn.ReadMessage(); errRead != nil {
						return
					}
					completed := []byte(`{"type":"response.completed","response":{"id":"response-1","output":[],"usage":{"input_tokens":0,"output_tokens":0,"total_tokens":0}}}`)
					if errWrite := conn.WriteMessage(websocket.TextMessage, completed); errWrite != nil {
						return
					}
				}
			}))
			defer server.Close()

			registry := executionregistry.New()
			dispatcher := &accountedWebsocketHomeDispatcher{provider: test.provider, baseURL: server.URL}
			var releaseGroups []executionregistry.ReleaseGroup
			registry.SetReleaseSink(func(group executionregistry.ReleaseGroup, _ int64) {
				dispatcher.releases.Add(1)
				releaseGroups = append(releaseGroups, group)
			})
			manager := cliproxyauth.NewManager(nil, nil, nil)
			manager.SetConfig(&config.Config{Home: config.HomeConfig{Enabled: true}})
			manager.PublishHomeDispatch(dispatcher, registry, 1)
			manager.RegisterExecutor(test.newExecutor())
			t.Cleanup(func() { manager.CloseExecutionSession("accounted-websocket-session") })

			ctx := cliproxyexecutor.WithDownstreamWebsocket(context.Background())
			opts := cliproxyexecutor.Options{
				Stream:         true,
				SourceFormat:   sdktranslator.FormatOpenAIResponse,
				ResponseFormat: sdktranslator.FormatOpenAIResponse,
				Metadata: map[string]any{
					cliproxyexecutor.ExecutionSessionMetadataKey: "accounted-websocket-session",
					cliproxyexecutor.PinnedAuthMetadataKey:       "accounted-websocket-auth",
				},
			}
			execute := func(model string) {
				t.Helper()
				result, errExecute := manager.ExecuteStream(ctx, []string{test.provider}, cliproxyexecutor.Request{Model: model, Payload: []byte(`{"model":"model-a","input":[]}`)}, opts)
				if errExecute != nil {
					t.Fatalf("ExecuteStream(%q) error = %v", model, errExecute)
				}
				for chunk := range result.Chunks {
					if chunk.Err != nil {
						t.Fatalf("ExecuteStream(%q) chunk error = %v", model, chunk.Err)
					}
				}
			}

			execute(" MODEL-A(HIGH) ")
			execute("model-a")
			if got := dispatcher.calls.Load(); got != 1 {
				t.Fatalf("Home RPOP calls = %d, want 1 for canonical retained reuse", got)
			}
			manager.CloseExecutionSession("accounted-websocket-session")
			execute("model-a")
			execute("model-a(custom)")
			if got := dispatcher.calls.Load(); got != 3 {
				t.Fatalf("Home RPOP calls = %d, want 3 after reconnect and target change", got)
			}
			if !dispatcher.before.Load() {
				t.Fatal("previous accounted selection was not released before redispatch")
			}
			manager.CloseExecutionSession("accounted-websocket-session")
			wantGroups := []executionregistry.ReleaseGroup{
				{CredentialID: "accounted-websocket-auth", Model: "model-a"},
				{CredentialID: "accounted-websocket-auth", Model: "model-a"},
				{CredentialID: "accounted-websocket-auth", Model: "model-a(custom)"},
			}
			if !reflect.DeepEqual(releaseGroups, wantGroups) {
				t.Fatalf("release groups = %#v, want %#v", releaseGroups, wantGroups)
			}
			if got := connections.Load(); got != 3 {
				t.Fatalf("upstream websocket connections = %d, want 3", got)
			}
		})
	}
}

func TestHomeSelectionRegistryDrainClosesRealWebsocketSessions(t *testing.T) {
	tests := []struct {
		name        string
		provider    string
		newExecutor func() (cliproxyauth.ProviderExecutor, func(string) *codexWebsocketSession, func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error))
	}{
		{
			name:     "Codex",
			provider: "codex",
			newExecutor: func() (cliproxyauth.ProviderExecutor, func(string) *codexWebsocketSession, func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error)) {
				executor := NewCodexWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				return executor, executor.getOrCreateSession, executor.ensureUpstreamConn
			},
		},
		{
			name:     "xAI",
			provider: "xai",
			newExecutor: func() (cliproxyauth.ProviderExecutor, func(string) *codexWebsocketSession, func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error)) {
				executor := NewXAIWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				return executor, executor.getOrCreateSession, executor.ensureUpstreamConn
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			server, closed := newWebsocketTargetServer(t)
			defer server.Close()

			executor, getSession, ensureConn := test.newExecutor()
			registry := executionregistry.New()
			manager := cliproxyauth.NewManager(nil, nil, nil)
			manager.SetConfig(&config.Config{Home: config.HomeConfig{Enabled: true}})
			manager.PublishHomeDispatch(websocketHomeDispatcher{provider: test.provider}, registry, 1)
			manager.RegisterExecutor(executor)
			selection, errSelect := manager.SelectHomeAuthByKind(context.Background(), test.provider, "model-a", cliproxyauth.AuthKindAPIKey, cliproxyexecutor.Options{})
			if errSelect != nil {
				t.Fatalf("SelectHomeAuthByKind() error = %v", errSelect)
			}
			auth := selection.CloneAuth()
			sess := getSession("real-home-drain")
			wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
			conn := ensureWebsocketTargetConn(t, ensureConn, auth, sess, auth.ID, wsURL)
			if errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: selection}, conn, sess.connCloser, "model-a"); errBind != nil {
				t.Fatalf("bind execution lifecycle: %v", errBind)
			}

			drainCtx, cancelDrain := context.WithTimeout(context.Background(), time.Second)
			defer cancelDrain()
			if errDrain := registry.Drain(drainCtx); errDrain != nil {
				t.Fatalf("Drain() error = %v", errDrain)
			}
			if selection.Active() {
				t.Fatal("registry drain did not end the Home dispatch selection")
			}
			if got := <-closed; got != auth.ID {
				t.Fatalf("closed server auth = %q, want %q", got, auth.ID)
			}
		})
	}
}

type codex426RetryDispatcher struct {
	calls                    atomic.Int32
	baseURLs                 []string
	websockets               []bool
	releases                 atomic.Int32
	releasedBeforeSecondRPop atomic.Bool
}

func (d *codex426RetryDispatcher) HeartbeatOK() bool { return true }

func (d *codex426RetryDispatcher) RPopAuth(_ context.Context, model string, _ string, _ http.Header, _ int) ([]byte, error) {
	call := int(d.calls.Add(1))
	if call > len(d.baseURLs) {
		return nil, fmt.Errorf("unexpected Home dispatch %d", call)
	}
	if call == 2 {
		d.releasedBeforeSecondRPop.Store(d.releases.Load() == 1)
	}
	credentialID := "codex-home-" + strconv.Itoa(call)
	attributes := map[string]string{
		"api_key":  "home-key",
		"base_url": d.baseURLs[call-1],
	}
	if call <= len(d.websockets) && d.websockets[call-1] {
		attributes["websockets"] = "true"
	}
	return json.Marshal(map[string]any{
		"model":      model,
		"auth_index": credentialID,
		"auth": map[string]any{
			"id":         credentialID,
			"provider":   "codex",
			"status":     "active",
			"attributes": attributes,
		},
		"concurrency": map[string]any{
			"accounted":     true,
			"credential_id": credentialID,
			"model":         model,
		},
	})
}

func (*codex426RetryDispatcher) AbortAmbiguousDispatch() {}

func TestAuditHomeCodex426WebsocketToHTTPFreshSelection(t *testing.T) {
	upgradeRequired := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		http.Error(w, "websocket upgrade required", http.StatusUpgradeRequired)
	}))
	defer upgradeRequired.Close()

	var httpFallbackCalls atomic.Int32
	httpFallback := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost || r.URL.Path != "/responses" {
			http.Error(w, "unexpected fallback request", http.StatusBadRequest)
			return
		}
		httpFallbackCalls.Add(1)
		w.Header().Set("Content-Type", "text/event-stream")
		_, _ = w.Write([]byte("data: {\"type\":\"response.completed\",\"response\":{\"id\":\"response-1\",\"output\":[],\"usage\":{\"input_tokens\":0,\"output_tokens\":0,\"total_tokens\":0}}}\n\n"))
	}))
	defer httpFallback.Close()

	executor := NewCodexAutoExecutor(&config.Config{SDKConfig: config.SDKConfig{DisableImageGeneration: config.DisableImageGenerationAll}})
	executor.wsExec.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
	dispatcher := &codex426RetryDispatcher{
		baseURLs:   []string{upgradeRequired.URL, httpFallback.URL},
		websockets: []bool{true, false},
	}
	registry := executionregistry.New()
	var releaseGroups []executionregistry.ReleaseGroup
	var releaseGroupsMu sync.Mutex
	releaseFlusher := internalhome.NewReleaseFlusher(func() config.CredentialConcurrencyConfig {
		return config.CredentialConcurrencyConfig{
			ReleaseFlushInterval: time.Millisecond,
			ReleaseMaxBackoff:    10 * time.Millisecond,
		}
	}, func(_ context.Context, frame internalhome.ConcurrencyReleaseFrame) error {
		dispatcher.releases.Add(1)
		releaseGroupsMu.Lock()
		releaseGroups = append(releaseGroups, executionregistry.ReleaseGroup{CredentialID: frame.CredentialID, Model: frame.Model})
		releaseGroupsMu.Unlock()
		return nil
	})
	registry.SetReleaseSink(releaseFlusher.MarkDirty)
	releaseCtx, cancelRelease := context.WithCancel(context.Background())
	releaseDone := make(chan struct{})
	go func() {
		defer close(releaseDone)
		releaseFlusher.Run(releaseCtx)
	}()
	defer func() {
		cancelRelease()
		<-releaseDone
	}()
	manager := cliproxyauth.NewManager(nil, nil, nil)
	manager.SetConfig(&config.Config{Home: config.HomeConfig{Enabled: true}})
	manager.PublishHomeDispatch(dispatcher, registry, 1)
	manager.RegisterExecutor(executor)

	ctx := cliproxyexecutor.WithDownstreamWebsocket(context.Background())
	result, errExecute := manager.ExecuteStream(ctx, []string{"codex"}, cliproxyexecutor.Request{Model: "gpt-5-codex", Payload: []byte(`{"model":"gpt-5-codex","input":[{"type":"message","role":"user","content":"hello"}]}`)}, cliproxyexecutor.Options{Stream: true, SourceFormat: sdktranslator.FormatOpenAIResponse, ResponseFormat: sdktranslator.FormatOpenAIResponse, Metadata: map[string]any{cliproxyexecutor.ExecutionSessionMetadataKey: "home-426"}})
	if errExecute != nil {
		t.Fatalf("ExecuteStream() error = %v", errExecute)
	}
	if !dispatcher.releasedBeforeSecondRPop.Load() {
		t.Fatal("first accounted selection was not released before the 426 retry RPOP")
	}
	if got := dispatcher.releases.Load(); got != 1 {
		t.Fatalf("accounted releases before response completion = %d, want 1", got)
	}
	for chunk := range result.Chunks {
		if chunk.Err != nil {
			t.Fatalf("stream chunk error = %v", chunk.Err)
		}
	}
	if got := dispatcher.calls.Load(); got != 2 {
		t.Fatalf("Home RPOP calls = %d, want 2 after 426", got)
	}
	if got := httpFallbackCalls.Load(); got != 1 {
		t.Fatalf("HTTP fallback calls = %d, want 1 on the fresh Home selection", got)
	}
	deadline := time.NewTimer(time.Second)
	defer deadline.Stop()
	for dispatcher.releases.Load() != 2 {
		select {
		case <-deadline.C:
			t.Fatalf("accounted releases after response completion = %d, want 2", dispatcher.releases.Load())
		case <-time.After(time.Millisecond):
		}
	}
	releaseGroupsMu.Lock()
	gotReleaseGroups := append([]executionregistry.ReleaseGroup(nil), releaseGroups...)
	releaseGroupsMu.Unlock()
	wantReleaseGroups := []executionregistry.ReleaseGroup{
		{CredentialID: "codex-home-1", Model: "gpt-5-codex"},
		{CredentialID: "codex-home-2", Model: "gpt-5-codex"},
	}
	if !reflect.DeepEqual(gotReleaseGroups, wantReleaseGroups) {
		t.Fatalf("accounted release groups = %#v, want %#v", gotReleaseGroups, wantReleaseGroups)
	}
}

func TestWebsocketRegistryDrainClosesAndEndsRetainedSession(t *testing.T) {
	tests := []struct {
		name       string
		getSession func(string) *codexWebsocketSession
		ensureConn func(context.Context, *cliproxyauth.Auth, *codexWebsocketSession, string, string, http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error)
	}{
		{
			name: "Codex",
			getSession: func(sessionID string) *codexWebsocketSession {
				executor := NewCodexWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				return executor.getOrCreateSession(sessionID)
			},
			ensureConn: func(ctx context.Context, auth *cliproxyauth.Auth, sess *codexWebsocketSession, authID, wsURL string, headers http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error) {
				executor := NewCodexWebsocketsExecutor(&config.Config{})
				return executor.ensureUpstreamConn(ctx, auth, sess, authID, wsURL, headers)
			},
		},
		{
			name: "xAI shared session",
			getSession: func(sessionID string) *codexWebsocketSession {
				executor := NewXAIWebsocketsExecutor(&config.Config{})
				executor.store = &codexWebsocketSessionStore{sessions: make(map[string]*codexWebsocketSession)}
				return executor.getOrCreateSession(sessionID)
			},
			ensureConn: func(ctx context.Context, auth *cliproxyauth.Auth, sess *codexWebsocketSession, authID, wsURL string, headers http.Header) (*websocket.Conn, *websocketConnectionCloser, *http.Response, error) {
				executor := NewXAIWebsocketsExecutor(&config.Config{})
				return executor.ensureUpstreamConn(ctx, auth, sess, authID, wsURL, headers)
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			server, closed := newWebsocketTargetServer(t)
			defer server.Close()

			registry := executionregistry.New()
			pending, errBegin := registry.BeginDispatch()
			if errBegin != nil {
				t.Fatalf("BeginDispatch() error = %v", errBegin)
			}
			scope, errInstall := registry.Install(pending, executionregistry.ScopeSpec{Kind: "websocket"})
			if errInstall != nil {
				t.Fatalf("Install() error = %v", errInstall)
			}
			lifecycle := &registryDrainWebsocketLifecycle{scope: scope}
			auth := &cliproxyauth.Auth{ID: "auth-a"}
			wsURL := "ws" + strings.TrimPrefix(server.URL, "http")
			sess := test.getSession("drain-retained-session")
			conn := ensureWebsocketTargetConn(t, test.ensureConn, auth, sess, auth.ID, wsURL)
			if errBind := sess.bindExecutionLifecycle(cliproxyexecutor.Options{ExecutionLifecycle: lifecycle}, conn, sess.connCloser, "model-a"); errBind != nil {
				t.Fatalf("bind execution lifecycle: %v", errBind)
			}

			drainCtx, cancelDrain := context.WithTimeout(context.Background(), time.Second)
			defer cancelDrain()
			if errDrain := registry.Drain(drainCtx); errDrain != nil {
				t.Fatalf("Drain() error = %v", errDrain)
			}
			if got := lifecycle.ends.Load(); got != 1 {
				t.Fatalf("lifecycle End calls = %d, want 1", got)
			}
			if got := <-closed; got != auth.ID {
				t.Fatalf("closed server auth = %q, want %q", got, auth.ID)
			}
		})
	}
}