package executor

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

	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
	cliproxyauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/executor"
	sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
	"github.com/tidwall/gjson"
)

func TestOpenAICompatExecutorCompactPassthrough(t *testing.T) {
	var gotPath string
	var gotBody []byte
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		body, _ := io.ReadAll(r.Body)
		gotBody = body
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"id":"resp_1","object":"response.compaction","usage":{"input_tokens":1,"output_tokens":2,"total_tokens":3}}`))
	}))
	defer server.Close()

	executor := NewOpenAICompatExecutor("openai-compatibility", &config.Config{})
	auth := &cliproxyauth.Auth{Attributes: map[string]string{
		"base_url": server.URL + "/v1",
		"api_key":  "test",
	}}
	payload := []byte(`{"model":"gpt-5.1-codex-max","input":[{"role":"user","content":"hi"}]}`)
	resp, err := executor.Execute(context.Background(), auth, cliproxyexecutor.Request{
		Model:   "gpt-5.1-codex-max",
		Payload: payload,
	}, cliproxyexecutor.Options{
		SourceFormat: sdktranslator.FromString("openai-response"),
		Alt:          "responses/compact",
		Stream:       false,
	})
	if err != nil {
		t.Fatalf("Execute error: %v", err)
	}
	if gotPath != "/v1/responses/compact" {
		t.Fatalf("path = %q, want %q", gotPath, "/v1/responses/compact")
	}
	if !gjson.GetBytes(gotBody, "input").Exists() {
		t.Fatalf("expected input in body")
	}
	if gjson.GetBytes(gotBody, "messages").Exists() {
		t.Fatalf("unexpected messages in body")
	}
	if string(resp.Payload) != `{"id":"resp_1","object":"response.compaction","usage":{"input_tokens":1,"output_tokens":2,"total_tokens":3}}` {
		t.Fatalf("payload = %s", string(resp.Payload))
	}
}

func TestOpenAICompatExecutorPayloadOverrideWinsOverThinkingSuffix(t *testing.T) {
	var gotBody []byte
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		body, _ := io.ReadAll(r.Body)
		gotBody = body
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"id":"chatcmpl_1","object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"ok"},"finish_reason":"stop"}],"usage":{"prompt_tokens":1,"completion_tokens":1,"total_tokens":2}}`))
	}))
	defer server.Close()

	executor := NewOpenAICompatExecutor("openai-compatibility", &config.Config{
		Payload: config.PayloadConfig{
			Override: []config.PayloadRule{
				{
					Models: []config.PayloadModelRule{
						{Name: "custom-openai", Protocol: "openai"},
					},
					Params: map[string]any{
						"reasoning_effort": "low",
					},
				},
			},
		},
	})
	auth := &cliproxyauth.Auth{Attributes: map[string]string{
		"base_url": server.URL + "/v1",
		"api_key":  "test",
	}}
	payload := []byte(`{"model":"custom-openai(high)","messages":[{"role":"user","content":"hi"}]}`)
	_, err := executor.Execute(context.Background(), auth, cliproxyexecutor.Request{
		Model:   "custom-openai(high)",
		Payload: payload,
	}, cliproxyexecutor.Options{
		SourceFormat: sdktranslator.FromString("openai"),
		Stream:       false,
	})
	if err != nil {
		t.Fatalf("Execute error: %v", err)
	}
	if got := gjson.GetBytes(gotBody, "reasoning_effort").String(); got != "low" {
		t.Fatalf("reasoning_effort = %q, want %q; body=%s", got, "low", string(gotBody))
	}
}

func TestOpenAICompatExecutorStreamRejectsPlainJSONAfterBlankLines(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/event-stream")
		_, _ = w.Write([]byte("\n\n: openrouter processing\n\nevent: error\n"))
		_, _ = w.Write([]byte(`{"error":{"message":"upstream failed","type":"server_error"}}` + "\n"))
	}))
	defer server.Close()

	executor := NewOpenAICompatExecutor("openai-compatibility", &config.Config{})
	auth := &cliproxyauth.Auth{Attributes: map[string]string{
		"base_url": server.URL + "/v1",
		"api_key":  "test",
	}}
	result, err := executor.ExecuteStream(context.Background(), auth, cliproxyexecutor.Request{
		Model:   "openrouter-model",
		Payload: []byte(`{"model":"openrouter-model","messages":[{"role":"user","content":"hi"}],"stream":true}`),
	}, cliproxyexecutor.Options{
		SourceFormat: sdktranslator.FromString("openai"),
		Stream:       true,
	})
	if err != nil {
		t.Fatalf("ExecuteStream error: %v", err)
	}

	var gotErr error
	for chunk := range result.Chunks {
		if chunk.Err != nil {
			gotErr = chunk.Err
			break
		}
	}
	if gotErr == nil {
		t.Fatalf("expected plain JSON stream error")
	}
	if status, ok := gotErr.(interface{ StatusCode() int }); !ok || status.StatusCode() != http.StatusBadGateway {
		t.Fatalf("stream error status = %v, want %d", gotErr, http.StatusBadGateway)
	}
	if !strings.Contains(gotErr.Error(), "upstream failed") {
		t.Fatalf("stream error = %v", gotErr)
	}
}

func TestOpenAICompatExecutorStreamSkipsKeepAliveUntilDataLine(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/event-stream")
		_, _ = w.Write([]byte("\n\n: openrouter processing\n\nevent: ping\nid: 1\nretry: 1000\n"))
		_, _ = w.Write([]byte(`data: {"id":"chatcmpl_1","object":"chat.completion.chunk","choices":[{"index":0,"delta":{"content":"hello"},"finish_reason":null}]}` + "\n"))
	}))
	defer server.Close()

	executor := NewOpenAICompatExecutor("openai-compatibility", &config.Config{})
	auth := &cliproxyauth.Auth{Attributes: map[string]string{
		"base_url": server.URL + "/v1",
		"api_key":  "test",
	}}
	result, err := executor.ExecuteStream(context.Background(), auth, cliproxyexecutor.Request{
		Model:   "openrouter-model",
		Payload: []byte(`{"model":"openrouter-model","messages":[{"role":"user","content":"hi"}],"stream":true}`),
	}, cliproxyexecutor.Options{
		SourceFormat: sdktranslator.FromString("openai"),
		Stream:       true,
	})
	if err != nil {
		t.Fatalf("ExecuteStream error: %v", err)
	}

	var got strings.Builder
	for chunk := range result.Chunks {
		if chunk.Err != nil {
			t.Fatalf("unexpected stream error: %v", chunk.Err)
		}
		got.Write(chunk.Payload)
	}
	if gjson.Get(got.String(), "choices.0.delta.content").String() != "hello" {
		t.Fatalf("stream payload = %s", got.String())
	}
}