package integration

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

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

// TestProtocolVersion 测试协议版本管理
func TestProtocolVersion(t *testing.T) {
	// 获取随机端口
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	require.NoError(t, err)
	port := listener.Addr().(*net.TCPAddr).Port
	listener.Close()

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

	// 创建服务器并在启动前注册协议和路由
	server, err := nnet.NewServer(cfg)
	require.NoError(t, err)

	// 注册多个版本的协议
	pm := server.ProtocolManager()

	// 注册 v1.0 版本
	protoV1 := internalprotocol.NewNNetProtocol("1.0")
	require.NoError(t, pm.Register(protoV1), "Should register protocol v1.0")

	// 注册 v2.0 版本
	protoV2 := internalprotocol.NewNNetProtocol("2.0")
	require.NoError(t, pm.Register(protoV2), "Should register protocol v2.0")

	// 设置默认协议版本为 v1.0
	require.NoError(t, pm.SetDefault("nnet", "1.0"), "Should set default protocol")

	// 注册路由
	server.Router().RegisterString("version", func(ctx nnet.Context) error {
		proto := pm.GetDefault()
		if proto != nil {
			return ctx.Response().Write(map[string]any{
				"protocol": proto.Name(),
				"version":  proto.Version(),
			})
		}
		return ctx.Response().Write(map[string]any{
			"protocol": "unknown",
			"version":  "unknown",
		})
	})

	// 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")
	
	// 等待服务器准备好
	require.Eventually(t, func() bool {
		testConn, err := net.DialTimeout("tcp", fmt.Sprintf("127.0.0.1:%d", port), 500*time.Millisecond)
		if err != nil {
			return false
		}
		testConn.Close()
		return true
	}, 5*time.Second, 100*time.Millisecond, "Server should be ready")

	defer CleanupTestServer(t, ts)

	client := NewTestClient(t, ts.Addr, &nnet.ClientConfig{
		ApplicationProtocol: "nnet",
	})
	defer CleanupTestClient(t, client)

	ConnectTestClient(t, client)

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

	// 使用nnet协议编码请求
	requestPacket, err := protoV1.Encode([]byte("version"), nil)
	require.NoError(t, err, "Failed to encode request with nnet protocol")

	respPacket := RequestWithTimeout(t, client, requestPacket, 3*time.Second)
	t.Logf("Response for version (raw): %q", string(respPacket))

	// 解码响应
	_, respPayload, err := protoV1.Decode(respPacket)
	require.NoError(t, err, "Failed to decode response packet")

	var result map[string]any
	err = json.Unmarshal(respPayload, &result)
	assert.NoError(t, err, "Response should be valid JSON")
	assert.Equal(t, "nnet", result["protocol"], "Protocol should be nnet")
	assert.Equal(t, "1.0", result["version"], "Version should be 1.0")
}