package intent

import (
	"context"
	"sync"
	"testing"
	"testing/fstest"
)

// TestConcurrentRecognizeAndReload 验证快照原子替换：识别与 Reload 并发时，
// 每次 Recognize 都拿到完整一致的快照（-race 下运行）。
func TestConcurrentRecognizeAndReload(t *testing.T) {
	fsys := fstest.MapFS{"specs/a.json": &fstest.MapFile{Data: []byte(
		`{"intents": [
		  {"id": "demo.run.status_query", "domain": "demo", "version": 1, "matcher": {"includes_any": ["进度"]}}
		]}`)}}
	b := newTestBuilder()
	if err := b.Register(demoGuardSpec()); err != nil {
		t.Fatal(err)
	}
	reg, err := b.BuildFS(context.Background(), fsys, "specs")
	if err != nil {
		t.Fatal(err)
	}
	rec := NewRecognizer(Options{}, nil, nil)
	inputs := []string{"查询任务进度", "你好", "帮我改网关", ""}

	var wg sync.WaitGroup
	for i := 0; i < 8; i++ {
		wg.Add(1)
		go func(seed int) {
			defer wg.Done()
			for j := 0; j < 200; j++ {
				in := inputs[(seed+j)%len(inputs)]
				if _, err := rec.Recognize(context.Background(), in, reg.Snapshot()); err != nil {
					t.Errorf("recognize: %v", err)
					return
				}
			}
		}(i)
	}
	wg.Add(1)
	go func() {
		defer wg.Done()
		for j := 0; j < 50; j++ {
			if _, err := reg.Reload(context.Background()); err != nil {
				t.Errorf("reload: %v", err)
				return
			}
		}
	}()
	wg.Wait()

	if got := reg.Snapshot().Revision(); got < 51 {
		t.Fatalf("expected revision >= 51, got %d", got)
	}
}