package main

// autotitle_test.go — needsAutoTitle gating, firstUserText extraction,
// requestTitle against a fake ZAI endpoint, apply path renames + broadcasts.

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func userMsgEndFrame(sid string, seq int64, text string) []byte {
	b, _ := json.Marshal(map[string]any{
		"v": 1, "sessionId": sid, "seq": seq, "ts": 1, "type": "message_end",
		"message": map[string]any{"role": "user", "id": "u", "text": text,
			"thinking": nil, "toolCalls": []any{}, "toolCallId": nil},
	})
	return b
}

func TestNeedsAutoTitleGating(t *testing.T) {
	_, _, hub := newTestServerHub(t)
	f := frame{typ: evMessageEnd, sessionID: "s-a", raw: userMsgEndFrame("s-a", 1, "hello")}
	if !hub.needsAutoTitle(f) {
		t.Fatal("first unnamed user message must want a title")
	}
	if hub.needsAutoTitle(f) {
		t.Fatal("second attempt for same session must be gated")
	}
	// assistant frames never trigger
	fa := frame{typ: evMessageEnd, sessionID: "s-b", raw: []byte(`{"message":{"role":"assistant"}}`)}
	if hub.needsAutoTitle(fa) {
		t.Fatal("assistant message must not trigger")
	}
	// named session never triggers (persisted via UpsertSession)
	if err := hub.store.UpsertSession(SessionInfo{ID: "s-c", Name: strPtr("named")}); err != nil {
		t.Fatal(err)
	}
	fc := frame{typ: evMessageEnd, sessionID: "s-c", raw: userMsgEndFrame("s-c", 1, "hi")}
	if hub.needsAutoTitle(fc) {
		t.Fatal("named session must not trigger")
	}
}

func strPtr(s string) *string { return &s }

func dummyTitleServer(t *testing.T) string {
	t.Helper()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte(`{"choices":[{"message":{"content":"Auto generated title"}}]}`))
	}))
	t.Cleanup(srv.Close)
	return srv.URL
}

func TestFirstUserText(t *testing.T) {
	if got := firstUserText(userMsgEndFrame("s", 1, "build me a thing")); got != "build me a thing" {
		t.Fatalf("got %q", got)
	}
	if got := firstUserText([]byte("garbage")); got != "" {
		t.Fatalf("garbage -> %q", got)
	}
}

func TestRequestTitle(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Messages []struct {
				Content string `json:"content"`
			} `json:"messages"`
		}
		_ = json.NewDecoder(r.Body).Decode(&req)
		if len(req.Messages) == 0 || req.Messages[0].Content == "" {
			w.WriteHeader(http.StatusBadRequest)
			return
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"choices": []any{map[string]any{
				"message": map[string]string{"content": "  \"Fix login timeout bug\".\n"},
			}},
		})
	}))
	t.Cleanup(srv.Close)

	t.Setenv("LVMH_AUTOTITLE_URL", srv.URL)
	got, err := requestTitle("the login page times out after 5s in production")
	if err != nil {
		t.Fatalf("requestTitle: %v", err)
	}
	if got != "Fix login timeout bug" {
		t.Fatalf("title = %q", got)
	}
}

func TestAutoTitleAppliesRename(t *testing.T) {
	_, _, hub := newTestServerHub(t)
	t.Setenv("LVMH_AUTOTITLE_URL", dummyTitleServer(t))
	if err := hub.store.UpsertSession(SessionInfo{ID: "s-t"}); err != nil {
		t.Fatal(err)
	}
	hub.autoTitle("s-t", "anything")
	rows, err := hub.store.Sessions()
	if err != nil {
		t.Fatal(err)
	}
	for _, row := range rows {
		if row.Info.ID == "s-t" {
			if row.Info.Name == nil || *row.Info.Name == "" {
				t.Fatal("name not applied")
			}
			return
		}
	}
	t.Fatal("session row missing")
}