package integration

import (
	"encoding/json"
	"fmt"
	"net"
	"testing"
	"time"

	"github.com/noahlann/nnet/pkg/nnet"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// TestUDPServerClient 测试UDP服务器-客户端通信
// 注意：UDP测试可能需要特殊处理，暂时跳过
func TestUDPServerClient(t *testing.T) {
	t.Skip("UDP test needs further investigation - gnet UDP handling")
	// 获取随机端口
	listener, err := net.ListenPacket("udp", "127.0.0.1:0")
	require.NoError(t, err)
	addr := listener.LocalAddr().(*net.UDPAddr)
	port := addr.Port
	listener.Close()

	cfg := &nnet.Config{
		Addr: fmt.Sprintf("udp://127.0.0.1:%d", port),
		Codec: &nnet.CodecConfig{
			DefaultCodec:         "json",
			EnableProtocolEncode: false,
		},
	}

	// 创建UDP服务器
	server, err := nnet.NewUDPServer(cfg)
	require.NoError(t, err)

	// 注册路由
	server.Router().RegisterString("hello", func(ctx nnet.Context) error {
		return ctx.Response().Write(map[string]any{
			"message": "hello from udp server",
		})
	})

	// 启动服务器
	ts := &TestServer{
		Server: server,
		Addr:   cfg.Addr,
		stopCh: make(chan struct{}),
	}

	ts.wg.Add(1)
	go func() {
		defer ts.wg.Done()
		if err := server.Start(); err != nil {
			t.Logf("Server error: %v", err)
		}
	}()

	require.Eventually(t, func() bool {
		return server.Started()
	}, 3*time.Second, 50*time.Millisecond, "Server should start within 3 seconds")
	time.Sleep(200 * time.Millisecond)

	defer CleanupTestServer(t, ts)

	// 创建UDP客户端
	client := NewTestClient(t, ts.Addr, &nnet.ClientConfig{
		TransportProtocol: "udp",
	})
	defer CleanupTestClient(t, client)

	ConnectTestClient(t, client)

	// 等待服务器准备好
	time.Sleep(100 * time.Millisecond)

	// 发送请求
	resp := RequestWithTimeout(t, client, []byte("hello"), 3*time.Second)
	t.Logf("Response: %q", string(resp))

	var result map[string]any
	err = json.Unmarshal(resp, &result)
	assert.NoError(t, err, "Response should be valid JSON")
	assert.Equal(t, "hello from udp server", result["message"], "Message should match")
}

// TestUDPMultipleClients 测试UDP多个客户端
// 注意：UDP测试可能需要特殊处理，暂时跳过
func TestUDPMultipleClients(t *testing.T) {
	t.Skip("UDP test needs further investigation - gnet UDP handling")
	listener, err := net.ListenPacket("udp", "127.0.0.1:0")
	require.NoError(t, err)
	addr := listener.LocalAddr().(*net.UDPAddr)
	port := addr.Port
	listener.Close()

	cfg := &nnet.Config{
		Addr: fmt.Sprintf("udp://127.0.0.1:%d", port),
		Codec: &nnet.CodecConfig{
			DefaultCodec: "json",
		},
	}

	ts := StartTestServerWithRoutes(t, cfg, func(srv nnet.Server) {
		srv.Router().RegisterString("test", func(ctx nnet.Context) error {
			return ctx.Response().Write(map[string]any{
				"status": "ok",
			})
		})
	})
	defer CleanupTestServer(t, ts)

	// 创建多个UDP客户端
	clients := make([]nnet.Client, 3)
	for i := 0; i < 3; i++ {
		client := NewTestClient(t, ts.Addr, &nnet.ClientConfig{
			TransportProtocol: "udp",
		})
		ConnectTestClient(t, client)
		clients[i] = client
	}

	time.Sleep(100 * time.Millisecond)

	// 所有客户端都应该能够发送请求
	for i, client := range clients {
		resp := RequestWithTimeout(t, client, []byte("test"), 3*time.Second)
		t.Logf("Response for client %d: %q", i, string(resp))

		var result map[string]any
		err := json.Unmarshal(resp, &result)
		assert.NoError(t, err, "Response should be valid JSON")
		assert.Equal(t, "ok", result["status"], "Status should be ok")
	}

	// 清理所有客户端
	for _, client := range clients {
		CleanupTestClient(t, client)
	}
}