nex/backend/internal/handler/proxy_handler_test.go

package handler

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"nex/backend/internal/conversion"
	"nex/backend/internal/conversion/anthropic"
	"nex/backend/internal/conversion/openai"
	"nex/backend/internal/domain"
	"nex/backend/internal/provider"
	appErrors "nex/backend/pkg/errors"
)

func init() {
	gin.SetMode(gin.TestMode)
}

type mockProxyProviderClient struct {
	sendFn      func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error)
	sendStreamFn func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error)
}

func (m *mockProxyProviderClient) Send(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
	if m.sendFn != nil {
		return m.sendFn(ctx, spec)
	}
	return &conversion.HTTPResponseSpec{
		StatusCode: 200,
		Headers:    map[string]string{"Content-Type": "application/json"},
		Body:       []byte(`{"id":"resp-1","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"hi"},"finish_reason":"stop"}],"usage":{"prompt_tokens":1,"completion_tokens":1,"total_tokens":2}}`),
	}, nil
}

func (m *mockProxyProviderClient) SendStream(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
	if m.sendStreamFn != nil {
		return m.sendStreamFn(ctx, spec)
	}
	ch := make(chan provider.StreamEvent, 10)
	go func() {
		defer close(ch)
		ch <- provider.StreamEvent{Data: []byte("data: {\"id\":\"1\",\"choices\":[{\"delta\":{\"content\":\"hi\"}}]}\n\n")}
		ch <- provider.StreamEvent{Data: []byte("data: [DONE]\n\n")}
		ch <- provider.StreamEvent{Done: true}
	}()
	return ch, nil
}

type mockProxyRoutingService struct {
	result *domain.RouteResult
	err    error
}

func (m *mockProxyRoutingService) RouteByModelName(providerID, modelName string) (*domain.RouteResult, error) {
	return m.result, m.err
}

type mockProxyProviderService struct {
	providers       []domain.Provider
	err             error
	enabledModels   []domain.Model
	modelByProvName *domain.Model
}

func (m *mockProxyProviderService) ListEnabledModels() ([]domain.Model, error) {
	return m.enabledModels, nil
}

func (m *mockProxyProviderService) GetModelByProviderAndName(providerID, modelName string) (*domain.Model, error) {
	return m.modelByProvName, nil
}

func (m *mockProxyProviderService) Create(p *domain.Provider) error                              { return nil }
func (m *mockProxyProviderService) Get(id string, maskKey bool) (*domain.Provider, error)        { return nil, nil }
func (m *mockProxyProviderService) List() ([]domain.Provider, error)                             { return m.providers, m.err }
func (m *mockProxyProviderService) Update(id string, updates map[string]interface{}) error        { return nil }
func (m *mockProxyProviderService) Delete(id string) error                                       { return nil }

type mockProxyStatsService struct{}

func (m *mockProxyStatsService) Record(providerID, modelName string) error                                         { return nil }
func (m *mockProxyStatsService) Get(providerID, modelName string, startDate, endDate *time.Time) ([]domain.UsageStats, error) { return nil, nil }
func (m *mockProxyStatsService) Aggregate(stats []domain.UsageStats, groupBy string) []map[string]interface{}      { return nil }

func setupProxyEngine(t *testing.T) *conversion.ConversionEngine {
	t.Helper()
	registry := conversion.NewMemoryRegistry()
	engine := conversion.NewConversionEngine(registry, nil)
	require.NoError(t, registry.Register(openai.NewAdapter()))
	require.NoError(t, registry.Register(anthropic.NewAdapter()))
	return engine
}

func newTestProxyHandler(engine *conversion.ConversionEngine, client *mockProxyProviderClient, routingSvc *mockProxyRoutingService, providerSvc *mockProxyProviderService) *ProxyHandler {
	return NewProxyHandler(
		engine,
		client,
		routingSvc,
		providerSvc,
		&mockProxyStatsService{},
	)
}

func TestProxyHandler_HandleProxy_MissingProtocol(t *testing.T) {
	engine := setupProxyEngine(t)
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("POST", "/", bytes.NewReader([]byte(`{}`)))

	h.HandleProxy(c)
	assert.Equal(t, 400, w.Code)
}

func TestProxyHandler_HandleProxy_NonStreamSuccess(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body: []byte(`{"id":"resp-1","object":"chat.completion","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"Hello"},"finish_reason":"stop"}],"usage":{"prompt_tokens":5,"completion_tokens":3,"total_tokens":8}}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	var resp map[string]any
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "resp-1", resp["id"])
}

func TestProxyHandler_HandleProxy_RoutingError_WithBody(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"unknown","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 404, w.Code)
}

func TestProxyHandler_HandleProxy_ConversionError(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return nil, context.DeadlineExceeded
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleProxy_ClientSendError(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return nil, context.DeadlineExceeded
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleProxy_StreamSuccess(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendStreamFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
			ch := make(chan provider.StreamEvent, 10)
			go func() {
				defer close(ch)
				ch <- provider.StreamEvent{Data: []byte("data: {\"id\":\"1\",\"object\":\"chat.completion.chunk\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\"}}]}\n\n")}
				ch <- provider.StreamEvent{Data: []byte("data: {\"id\":\"1\",\"object\":\"chat.completion.chunk\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"Hello\"}}]}\n\n")}
				ch <- provider.StreamEvent{Data: []byte("data: [DONE]\n\n")}
				ch <- provider.StreamEvent{Done: true}
			}()
			return ch, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "text/event-stream", w.Header().Get("Content-Type"))
	assert.Contains(t, w.Body.String(), "Hello")
}

func TestProxyHandler_HandleProxy_StreamError(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendStreamFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
			return nil, context.DeadlineExceeded
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_ForwardPassthrough_GET(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"object":"list","data":[{"id":"gpt-4","object":"model"}]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

func TestProxyHandler_ForwardPassthrough_UnsupportedProtocol(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "unknown"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/unknown/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 400, w.Code)
}

func TestProxyHandler_ForwardPassthrough_NoProviders(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{providers: []domain.Provider{}}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	// Models 接口现在本地聚合，返回空列表 200
	assert.Equal(t, 200, w.Code)
}

func TestExtractHeaders(t *testing.T) {
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("POST", "/", nil)
	c.Request.Header.Set("Authorization", "Bearer test")
	c.Request.Header.Set("Content-Type", "application/json")

	headers := extractHeaders(c)
	assert.Equal(t, "Bearer test", headers["Authorization"])
	assert.Equal(t, "application/json", headers["Content-Type"])
}

func TestProxyHandler_HandleProxy_ProviderProtocolDefault(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Body:       []byte(`{"id":"r1","object":"chat.completion","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"ok"},"finish_reason":"stop"}],"usage":{"prompt_tokens":1,"completion_tokens":1,"total_tokens":2}}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

func TestProxyHandler_WriteConversionError_NonConversionError(t *testing.T) {
	engine := setupProxyEngine(t)
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("POST", "/", nil)

	h.writeConversionError(c, context.DeadlineExceeded, "openai")
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_WriteConversionError_ConversionError(t *testing.T) {
	engine := setupProxyEngine(t)
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("POST", "/", nil)

	convErr := conversion.NewConversionError(conversion.ErrorCodeInvalidInput, "bad request")
	h.writeConversionError(c, convErr, "openai")
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleProxy_EmptyBody(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Body:       []byte(`{"object":"list","data":[]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

func TestProxyHandler_HandleStream_MidStreamError(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendStreamFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
			ch := make(chan provider.StreamEvent, 10)
			go func() {
				defer close(ch)
				ch <- provider.StreamEvent{Data: []byte("data: {\"id\":\"1\",\"object\":\"chat.completion.chunk\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"Hello\"}}]}\n\n")}
				ch <- provider.StreamEvent{Error: fmt.Errorf("connection reset by peer")}
			}()
			return ch, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "text/event-stream", w.Header().Get("Content-Type"))
	body := w.Body.String()
	assert.Contains(t, body, "Hello")
}

func TestProxyHandler_HandleStream_FlushOutput(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendStreamFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
			ch := make(chan provider.StreamEvent, 10)
			go func() {
				defer close(ch)
				ch <- provider.StreamEvent{Data: []byte("data: {\"id\":\"1\",\"object\":\"chat.completion.chunk\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"Hi\"}}]}\n\n")}
				ch <- provider.StreamEvent{Data: []byte("data: [DONE]\n\n")}
				ch <- provider.StreamEvent{Done: true}
			}()
			return ch, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "text/event-stream", w.Header().Get("Content-Type"))
	assert.Equal(t, "no-cache", w.Header().Get("Cache-Control"))
	assert.Equal(t, "keep-alive", w.Header().Get("Connection"))
	body := w.Body.String()
	assert.Contains(t, body, "Hi")
	assert.Contains(t, body, "[DONE]")
}

func TestProxyHandler_HandleStream_CreateStreamConverterError(t *testing.T) {
	registry := conversion.NewMemoryRegistry()
	engine := conversion.NewConversionEngine(registry, nil)
	err := registry.Register(openai.NewAdapter())
	require.NoError(t, err)

	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "nonexistent", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleStream_ConvertRequestError(t *testing.T) {
	registry := conversion.NewMemoryRegistry()
	engine := conversion.NewConversionEngine(registry, nil)
	require.NoError(t, registry.Register(openai.NewAdapter()))

	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "nonexistent", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleNonStream_ConvertResponseError(t *testing.T) {
	registry := conversion.NewMemoryRegistry()
	engine := conversion.NewConversionEngine(registry, nil)
	require.NoError(t, registry.Register(openai.NewAdapter()))
	require.NoError(t, registry.Register(anthropic.NewAdapter()))

	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "anthropic", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "claude-3", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`invalid json`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"claude-3","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 500, w.Code)
}

func TestProxyHandler_HandleNonStream_ResponseHeaders(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "p1", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json", "X-Custom": "test-value"},
				Body:       []byte(`{"id":"r1","object":"chat.completion","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"ok"},"finish_reason":"stop"}],"usage":{"prompt_tokens":1,"completion_tokens":1,"total_tokens":2}}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "test-value", w.Header().Get("X-Custom"))
	assert.Equal(t, "application/json", w.Header().Get("Content-Type"))
}

func TestProxyHandler_ForwardPassthrough_CrossProtocol(t *testing.T) {
	registry := conversion.NewMemoryRegistry()
	engine := conversion.NewConversionEngine(registry, nil)
	require.NoError(t, registry.Register(openai.NewAdapter()))

	anthropicAdapter := anthropic.NewAdapter()
	require.NoError(t, registry.Register(anthropicAdapter))

	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "anthropic"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"object":"list","data":[]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

func TestProxyHandler_ForwardPassthrough_NoBody_NoModel(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"object":"list","data":[{"id":"gpt-4","object":"model"}]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

func TestIsStreamRequest_EdgeCases(t *testing.T) {
	engine := setupProxyEngine(t)
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, &mockProxyProviderService{})

	tests := []struct {
		name     string
		body     string
		path     string
		expected bool
	}{
		{"stream at end of JSON", `{"messages":[],"stream":true}`, "/v1/chat/completions", true},
		{"stream with spaces", `{"stream" :  true}`, "/v1/chat/completions", true},
		{"stream embedded in string value", `{"model":"stream:true"}`, "/v1/chat/completions", false},
		{"empty body", "", "/v1/chat/completions", false},
		{"stream true embeddings", `{"model":"text-emb","stream":true}`, "/v1/embeddings", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := h.isStreamRequest([]byte(tt.body), "openai", tt.path)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestProxyHandler_WriteError_RouteError(t *testing.T) {
	engine := setupProxyEngine(t)
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest("POST", "/", nil)

	h.writeError(c, fmt.Errorf("model not found"), "openai")
	assert.Equal(t, 404, w.Code)
}

func TestProxyHandler_HandleProxy_RouteEmptyBody_NoModel(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Body:       []byte(`{"object":"list","data":[]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

// ============ isStreamRequest 测试 ============

func TestIsStreamRequest(t *testing.T) {
	engine := setupProxyEngine(t)
	h := &ProxyHandler{engine: engine}

	tests := []struct {
		name           string
		body           []byte
		clientProtocol string
		nativePath     string
		expected       bool
	}{
		{
			name:           "stream true",
			body:           []byte(`{"model": "gpt-4", "stream": true}`),
			clientProtocol: "openai",
			nativePath:     "/v1/chat/completions",
			expected:       true,
		},
		{
			name:           "stream false",
			body:           []byte(`{"model": "gpt-4", "stream": false}`),
			clientProtocol: "openai",
			nativePath:     "/v1/chat/completions",
			expected:       false,
		},
		{
			name:           "no stream field",
			body:           []byte(`{"model": "gpt-4"}`),
			clientProtocol: "openai",
			nativePath:     "/v1/chat/completions",
			expected:       false,
		},
		{
			name:           "invalid json",
			body:           []byte(`{invalid}`),
			clientProtocol: "openai",
			nativePath:     "/v1/chat/completions",
			expected:       false,
		},
		{
			name:           "not chat endpoint",
			body:           []byte(`{"model": "gpt-4", "stream": true}`),
			clientProtocol: "openai",
			nativePath:     "/v1/models",
			expected:       false,
		},
		{
			name:           "anthropic stream",
			body:           []byte(`{"model": "claude-3", "stream": true}`),
			clientProtocol: "anthropic",
			nativePath:     "/v1/messages",
			expected:       true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := h.isStreamRequest(tt.body, tt.clientProtocol, tt.nativePath)
			assert.Equal(t, tt.expected, result)
		})
	}
}

// ============ Models / ModelInfo 本地聚合测试 ============

func TestProxyHandler_HandleProxy_Models_LocalAggregation(t *testing.T) {
	engine := setupProxyEngine(t)
	providerSvc := &mockProxyProviderService{
		enabledModels: []domain.Model{
			{ID: "m1", ProviderID: "openai", ModelName: "gpt-4", Enabled: true},
			{ID: "m2", ProviderID: "anthropic", ModelName: "claude-3", Enabled: true},
		},
	}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	data, ok := resp["data"].([]interface{})
	require.True(t, ok)
	assert.Len(t, data, 2)

	// 验证统一模型 ID 格式
	first := data[0].(map[string]interface{})
	assert.Equal(t, "openai/gpt-4", first["id"])
}

func TestProxyHandler_HandleProxy_ModelInfo_LocalQuery(t *testing.T) {
	engine := setupProxyEngine(t)
	providerSvc := &mockProxyProviderService{
		modelByProvName: &domain.Model{ID: "m1", ProviderID: "openai", ModelName: "gpt-4", Enabled: true},
	}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, &mockProxyRoutingService{}, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models/openai/gpt-4"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models/openai/gpt-4", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "openai/gpt-4", resp["id"])
}

func TestProxyHandler_HandleProxy_Models_EmptySuffix_ForwardPassthrough(t *testing.T) {
	engine := setupProxyEngine(t)
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Body:       []byte(`{"object":"list","data":[]}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, &mockProxyRoutingService{err: appErrors.ErrModelNotFound}, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/models/"}}
	c.Request = httptest.NewRequest("GET", "/openai/v1/models/", nil)

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
}

// ============ Smart Passthrough 统一模型 ID 路由测试 ============

func TestProxyHandler_HandleProxy_SmartPassthrough_UnifiedID(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "openai_p", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "openai_p", ModelName: "gpt-4", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			// 验证请求体中的 model 已被改写为上游模型名
			var req map[string]interface{}
			json.Unmarshal(spec.Body, &req)
			assert.Equal(t, "gpt-4", req["model"])

			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"id":"resp-1","object":"chat.completion","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"Hello"},"finish_reason":"stop"}],"usage":{"prompt_tokens":5,"completion_tokens":3,"total_tokens":8}}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	// 客户端发送统一模型 ID
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"openai_p/gpt-4","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	// 验证响应中的 model 已被改写为统一模型 ID
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "openai_p/gpt-4", resp["model"])
}

// ============ 跨协议统一模型 ID 路由测试 ============

func TestProxyHandler_HandleProxy_CrossProtocol_NonStream_UnifiedID(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "anthropic_p", Name: "Anthropic", APIKey: "sk-test", BaseURL: "https://api.anthropic.com", Protocol: "anthropic", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "anthropic_p", ModelName: "claude-3", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"id":"msg-1","type":"message","role":"assistant","model":"claude-3","content":[{"type":"text","text":"Hello"}],"stop_reason":"end_turn","usage":{"input_tokens":5,"output_tokens":3}}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	// OpenAI 客户端使用统一模型 ID 路由到 Anthropic 供应商
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"anthropic_p/claude-3","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	// 验证跨协议转换后响应中的 model 被覆写为统一模型 ID
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "anthropic_p/claude-3", resp["model"])
}

func TestProxyHandler_HandleProxy_CrossProtocol_Stream_UnifiedID(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "anthropic_p", Name: "Anthropic", APIKey: "sk-test", BaseURL: "https://api.anthropic.com", Protocol: "anthropic", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "anthropic_p", ModelName: "claude-3", Enabled: true},
		},
	}
	client := &mockProxyProviderClient{
		sendStreamFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (<-chan provider.StreamEvent, error) {
			ch := make(chan provider.StreamEvent, 10)
			go func() {
				defer close(ch)
				ch <- provider.StreamEvent{Data: []byte(`event: message_start
data: {"type":"message_start","message":{"id":"msg-1","type":"message","role":"assistant","model":"claude-3","content":[]}}

`)}
				ch <- provider.StreamEvent{Data: []byte(`event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hi"}}

`)}
				ch <- provider.StreamEvent{Data: []byte(`event: message_stop
data: {"type":"message_stop"}

`)}
				ch <- provider.StreamEvent{Done: true}
			}()
			return ch, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"anthropic_p/claude-3","messages":[{"role":"user","content":"hi"}],"stream":true}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)
	assert.Equal(t, "text/event-stream", w.Header().Get("Content-Type"))

	body := w.Body.String()
	// 验证跨协议流式中 model 被覆写为统一模型 ID
	assert.Contains(t, body, "anthropic_p/claude-3", "跨协议流式响应中 model 应被覆写为统一模型 ID")
}

func TestProxyHandler_HandleProxy_SmartPassthrough_Fidelity(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{
		result: &domain.RouteResult{
			Provider: &domain.Provider{ID: "openai_p", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai", Enabled: true},
			Model:    &domain.Model{ID: "m1", ProviderID: "openai_p", ModelName: "gpt-4", Enabled: true},
		},
	}
	var capturedRequestBody []byte
	client := &mockProxyProviderClient{
		sendFn: func(ctx context.Context, spec conversion.HTTPRequestSpec) (*conversion.HTTPResponseSpec, error) {
			capturedRequestBody = spec.Body
			return &conversion.HTTPResponseSpec{
				StatusCode: 200,
				Headers:    map[string]string{"Content-Type": "application/json"},
				Body:       []byte(`{"id":"resp-1","object":"chat.completion","model":"gpt-4","choices":[{"index":0,"message":{"role":"assistant","content":"Hello"},"finish_reason":"stop"}],"usage":{"prompt_tokens":5,"completion_tokens":3,"total_tokens":8},"unknown_field":"preserved"}`),
			}, nil
		},
	}
	h := newTestProxyHandler(engine, client, routingSvc, &mockProxyProviderService{})

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	// 包含未知参数，验证 Smart Passthrough 保真性
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"openai_p/gpt-4","messages":[{"role":"user","content":"hi"}],"custom_param":"should_be_preserved"}`)))

	h.HandleProxy(c)
	assert.Equal(t, 200, w.Code)

	// 验证请求中 model 被改写为上游模型名，但未知参数保留
	var reqBody map[string]interface{}
	require.NoError(t, json.Unmarshal(capturedRequestBody, &reqBody))
	assert.Equal(t, "gpt-4", reqBody["model"], "请求中 model 应被改写为上游模型名")
	assert.Equal(t, "should_be_preserved", reqBody["custom_param"], "Smart Passthrough 应保留未知参数")

	// 验证响应中 model 被改写为统一模型 ID，但未知参数保留
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "openai_p/gpt-4", resp["model"], "响应中 model 应被改写为统一模型 ID")
	assert.Equal(t, "preserved", resp["unknown_field"], "Smart Passthrough 应保留未知响应字段")
}

func TestProxyHandler_HandleProxy_UnifiedID_ModelNotFound(t *testing.T) {
	engine := setupProxyEngine(t)
	routingSvc := &mockProxyRoutingService{err: appErrors.ErrModelNotFound}
	providerSvc := &mockProxyProviderService{
		providers: []domain.Provider{
			{ID: "p1", Name: "Test", APIKey: "sk-test", BaseURL: "https://api.test.com", Protocol: "openai"},
		},
	}
	h := newTestProxyHandler(engine, &mockProxyProviderClient{}, routingSvc, providerSvc)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "protocol", Value: "openai"}, {Key: "path", Value: "/chat/completions"}}
	// 使用统一模型 ID 格式但模型不存在
	c.Request = httptest.NewRequest("POST", "/openai/v1/chat/completions", bytes.NewReader([]byte(`{"model":"unknown/model","messages":[{"role":"user","content":"hi"}]}`)))

	h.HandleProxy(c)
	assert.Equal(t, 404, w.Code)

	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Contains(t, resp, "error")
}