package openai

import (
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/go-chi/chi/v5"
	chimw "github.com/go-chi/chi/v5/middleware"

	"ds2api/internal/auth"
)

type streamStatusAuthStub struct{}

func (streamStatusAuthStub) Determine(_ *http.Request) (*auth.RequestAuth, error) {
	return &auth.RequestAuth{
		UseConfigToken: false,
		DeepSeekToken:  "direct-token",
		CallerID:       "caller:test",
		TriedAccounts:  map[string]bool{},
	}, nil
}

func (streamStatusAuthStub) DetermineCaller(_ *http.Request) (*auth.RequestAuth, error) {
	return &auth.RequestAuth{
		UseConfigToken: false,
		DeepSeekToken:  "direct-token",
		CallerID:       "caller:test",
		TriedAccounts:  map[string]bool{},
	}, nil
}

func (streamStatusAuthStub) Release(_ *auth.RequestAuth) {}

type streamStatusDSStub struct {
	resp *http.Response
}

func (m streamStatusDSStub) CreateSession(_ context.Context, _ *auth.RequestAuth, _ int) (string, error) {
	return "session-id", nil
}

func (m streamStatusDSStub) GetPow(_ context.Context, _ *auth.RequestAuth, _ int) (string, error) {
	return "pow", nil
}

func (m streamStatusDSStub) CallCompletion(_ context.Context, _ *auth.RequestAuth, _ map[string]any, _ string, _ int) (*http.Response, error) {
	return m.resp, nil
}

func (m streamStatusDSStub) DeleteAllSessionsForToken(_ context.Context, _ string) error {
	return nil
}

func makeOpenAISSEHTTPResponse(lines ...string) *http.Response {
	body := strings.Join(lines, "\n")
	if !strings.HasSuffix(body, "\n") {
		body += "\n"
	}
	return &http.Response{
		StatusCode: http.StatusOK,
		Header:     make(http.Header),
		Body:       io.NopCloser(strings.NewReader(body)),
	}
}

func captureStatusMiddleware(statuses *[]int) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			ww := chimw.NewWrapResponseWriter(w, r.ProtoMajor)
			next.ServeHTTP(ww, r)
			*statuses = append(*statuses, ww.Status())
		})
	}
}

func TestChatCompletionsStreamStatusCapturedAs200(t *testing.T) {
	statuses := make([]int, 0, 1)
	h := &Handler{
		Store: mockOpenAIConfig{wideInput: true},
		Auth:  streamStatusAuthStub{},
		DS:    streamStatusDSStub{resp: makeOpenAISSEHTTPResponse(`data: {"p":"response/content","v":"hello"}`, "data: [DONE]")},
	}
	r := chi.NewRouter()
	r.Use(captureStatusMiddleware(&statuses))
	RegisterRoutes(r, h)

	reqBody := `{"model":"deepseek-chat","messages":[{"role":"user","content":"hi"}],"stream":true}`
	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(reqBody))
	req.Header.Set("Authorization", "Bearer direct-token")
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()
	r.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", rec.Code, rec.Body.String())
	}
	if len(statuses) != 1 {
		t.Fatalf("expected one captured status, got %d", len(statuses))
	}
	if statuses[0] != http.StatusOK {
		t.Fatalf("expected captured status 200 (not 000), got %d", statuses[0])
	}
}

func TestResponsesStreamStatusCapturedAs200(t *testing.T) {
	statuses := make([]int, 0, 1)
	h := &Handler{
		Store: mockOpenAIConfig{wideInput: true},
		Auth:  streamStatusAuthStub{},
		DS:    streamStatusDSStub{resp: makeOpenAISSEHTTPResponse(`data: {"p":"response/content","v":"hello"}`, "data: [DONE]")},
	}
	r := chi.NewRouter()
	r.Use(captureStatusMiddleware(&statuses))
	RegisterRoutes(r, h)

	reqBody := `{"model":"deepseek-chat","input":"hi","stream":true}`
	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(reqBody))
	req.Header.Set("Authorization", "Bearer direct-token")
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()
	r.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", rec.Code, rec.Body.String())
	}
	if len(statuses) != 1 {
		t.Fatalf("expected one captured status, got %d", len(statuses))
	}
	if statuses[0] != http.StatusOK {
		t.Fatalf("expected captured status 200 (not 000), got %d", statuses[0])
	}
}

func TestResponsesNonStreamMixedProseToolPayloadHandlerPath(t *testing.T) {
	statuses := make([]int, 0, 1)
	content, _ := json.Marshal(map[string]any{
		"p": "response/content",
		"v": "我来调用工具\n{\"tool_calls\":[{\"name\":\"read_file\",\"input\":{\"path\":\"README.MD\"}}]}",
	})
	h := &Handler{
		Store: mockOpenAIConfig{wideInput: true},
		Auth:  streamStatusAuthStub{},
		DS:    streamStatusDSStub{resp: makeOpenAISSEHTTPResponse("data: "+string(content), "data: [DONE]")},
	}
	r := chi.NewRouter()
	r.Use(captureStatusMiddleware(&statuses))
	RegisterRoutes(r, h)

	reqBody := `{"model":"deepseek-chat","input":"请调用工具","tools":[{"type":"function","function":{"name":"read_file","description":"read","parameters":{"type":"object","properties":{"path":{"type":"string"}}}}}],"stream":false}`
	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(reqBody))
	req.Header.Set("Authorization", "Bearer direct-token")
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()
	r.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", rec.Code, rec.Body.String())
	}
	if len(statuses) != 1 || statuses[0] != http.StatusOK {
		t.Fatalf("expected captured status 200, got %#v", statuses)
	}

	var out map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &out); err != nil {
		t.Fatalf("decode response failed: %v body=%s", err, rec.Body.String())
	}
	outputText, _ := out["output_text"].(string)
	if outputText != "" {
		t.Fatalf("expected output_text hidden for mixed prose tool payload, got %q", outputText)
	}
	output, _ := out["output"].([]any)
	if len(output) != 1 {
		t.Fatalf("expected one output item, got %#v", output)
	}
	first, _ := output[0].(map[string]any)
	if first["type"] != "function_call" {
		t.Fatalf("expected function_call output item, got %#v", output)
	}
}