package observability_test

import (
	"context"
	"testing"
	"time"

	"github.com/AmaniQuery/amaniquery/pkg/observability"
)

// TestNewLogger tests logger creation
func TestNewLogger_Info(t *testing.T) {
	logger, err := observability.NewLogger("info", "json")
	if err != nil {
		t.Fatalf("NewLogger failed: %v", err)
	}
	if logger == nil {
		t.Fatal("Expected non-nil logger")
	}
	logger.Sync()
}

// TestNewLogger_Debug tests debug level logger
func TestNewLogger_Debug(t *testing.T) {
	logger, err := observability.NewLogger("debug", "console")
	if err != nil {
		t.Fatalf("NewLogger failed: %v", err)
	}
	if logger == nil {
		t.Fatal("Expected non-nil logger")
	}
	logger.Sync()
}

// TestNewLogger_Error tests error level logger
func TestNewLogger_Error(t *testing.T) {
	logger, err := observability.NewLogger("error", "json")
	if err != nil {
		t.Fatalf("NewLogger failed: %v", err)
	}
	if logger == nil {
		t.Fatal("Expected non-nil logger")
	}
	logger.Sync()
}

// TestNewLogger_InvalidLevel tests invalid log level fallback
func TestNewLogger_InvalidLevel(t *testing.T) {
	// Should default to info level on invalid input
	logger, err := observability.NewLogger("invalid", "json")
	if err != nil {
		t.Fatalf("NewLogger failed: %v", err)
	}
	if logger == nil {
		t.Fatal("Expected non-nil logger")
	}
	logger.Sync()
}

// TestInitProvider tests tracing provider initialization
func TestInitProvider_Disabled(t *testing.T) {
	cfg := observability.Config{
		ServiceName:    "test-service",
		ServiceVersion: "1.0.0",
		TracingEnabled: false, // Disabled
		MetricsEnabled: false,
	}

	shutdown, err := observability.InitProvider(cfg)
	if err != nil {
		t.Fatalf("InitProvider failed: %v", err)
	}

	if shutdown != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := shutdown(ctx); err != nil {
			t.Errorf("Shutdown failed: %v", err)
		}
	}
}

// TestStartMetricsServer tests metrics server startup
func TestStartMetricsServer(t *testing.T) {
	// Use a random high port to avoid conflicts
	server := observability.StartMetricsServer(0) // Port 0 for auto-assign
	if server == nil {
		t.Fatal("Expected non-nil server")
	}

	// Give it a moment to start
	time.Sleep(100 * time.Millisecond)

	// Shutdown
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := server.Shutdown(ctx); err != nil {
		t.Errorf("Shutdown failed: %v", err)
	}
}

// TestUnaryServerInterceptor tests gRPC unary interceptor
func TestUnaryServerInterceptor(t *testing.T) {
	interceptor := observability.UnaryServerInterceptor()
	if interceptor == nil {
		t.Fatal("Expected non-nil interceptor")
	}
}

// TestStreamServerInterceptor tests gRPC stream interceptor
func TestStreamServerInterceptor(t *testing.T) {
	interceptor := observability.StreamServerInterceptor()
	if interceptor == nil {
		t.Fatal("Expected non-nil interceptor")
	}
}

// TestRecordQuery tests query metric recording
func TestRecordQuery(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordQuery("success", true, "vector", 100*time.Millisecond)
	observability.RecordQuery("error", false, "hybrid", 50*time.Millisecond)
}

// TestRecordRetrieval tests retrieval metric recording
func TestRecordRetrieval(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordRetrieval("vector", 50*time.Millisecond)
	observability.RecordRetrieval("keyword", 30*time.Millisecond)
	observability.RecordRetrieval("hybrid", 80*time.Millisecond)
}

// TestRecordGeneration tests generation metric recording
func TestRecordGeneration(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordGeneration(200 * time.Millisecond)
	observability.RecordGeneration(100 * time.Millisecond)
}

// TestRecordTokens tests token usage metric recording
func TestRecordTokens(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordTokens("input", 100)
	observability.RecordTokens("output", 50)
}

// TestRecordCacheHit tests cache hit metric recording
func TestRecordCacheHit(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordCacheHit("local")
	observability.RecordCacheHit("redis")
}

// TestRecordCacheMiss tests cache miss metric recording
func TestRecordCacheMiss(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordCacheMiss("local")
	observability.RecordCacheMiss("redis")
}

// TestRecordDocumentIndexed tests document indexed metric recording
func TestRecordDocumentIndexed(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordDocumentIndexed()
}

// TestRecordError tests error metric recording
func TestRecordError(t *testing.T) {
	// Just verify it doesn't panic
	observability.RecordError("api_error", "gateway")
	observability.RecordError("timeout", "retriever")
}

// TestIncrementDecrementConnections tests connection tracking
func TestIncrementDecrementConnections(t *testing.T) {
	// Just verify it doesn't panic
	observability.IncrementConnections()
	observability.IncrementConnections()
	observability.DecrementConnections()
}

// BenchmarkRecordQuery benchmarks query recording
func BenchmarkRecordQuery(b *testing.B) {
	for i := 0; i < b.N; i++ {
		observability.RecordQuery("success", true, "vector", time.Millisecond)
	}
}

// BenchmarkRecordRetrieval benchmarks retrieval recording
func BenchmarkRecordRetrieval(b *testing.B) {
	for i := 0; i < b.N; i++ {
		observability.RecordRetrieval("vector", time.Millisecond)
	}
}

// BenchmarkRecordCacheHit benchmarks cache hit recording
func BenchmarkRecordCacheHit(b *testing.B) {
	for i := 0; i < b.N; i++ {
		observability.RecordCacheHit("local")
	}
}