package llm

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

// TestOpenAIChatBodyReasoningSplit 验证 Client.ReasoningSplit 置位时
// openai-chat 请求体带 "reasoning_split": true，未置位时不带（未知字段
// 不外溢给别的提供商）。
func TestOpenAIChatBodyReasoningSplit(t *testing.T) {
	var bodies []string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		raw, _ := io.ReadAll(r.Body)
		bodies = append(bodies, string(raw))
		w.Header().Set("Content-Type", "text/event-stream")
		_, _ = io.WriteString(w, "data: [DONE]\n\n")
	}))
	defer srv.Close()

	drain := func(c *Client) {
		for range c.Stream(context.Background(), "MiniMax-M3",
			[]Message{{Role: RoleUser, Content: "hi"}}, nil, StreamOptions{}) {
		}
	}

	drain(&Client{BaseURL: srv.URL, APIKey: "k"})
	drain(&Client{BaseURL: srv.URL, APIKey: "k", ReasoningSplit: true})
	if len(bodies) != 2 {
		t.Fatalf("requests = %d", len(bodies))
	}
	if strings.Contains(bodies[0], "reasoning_split") {
		t.Fatalf("flag off must not leak the field: %s", bodies[0])
	}
	var got map[string]any
	if err := json.Unmarshal([]byte(bodies[1]), &got); err != nil {
		t.Fatal(err)
	}
	if v, ok := got["reasoning_split"].(bool); !ok || !v {
		t.Fatalf("flag on must set reasoning_split=true: %s", bodies[1])
	}
}