package integration

import (
	"fmt"
	"net"
	"strings"
	"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"
)

// TestLargeMessage 测试大消息处理
func TestLargeMessage(t *testing.T) {
	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),
		Codec: &nnet.CodecConfig{
			DefaultCodec: "json",
		},
	}

	ts := StartTestServerWithRoutes(t, cfg, func(srv nnet.Server) {
		srv.Router().RegisterString("large", func(ctx nnet.Context) error {
			// 返回大消息
			largeData := strings.Repeat("x", 10000)
			return ctx.Response().Write(map[string]any{
				"size": len(largeData),
				"data": largeData,
			})
		})
	})
	defer CleanupTestServer(t, ts)

	client := NewTestClient(t, ts.Addr, nil)
	defer CleanupTestClient(t, client)

	ConnectTestClient(t, client)
	time.Sleep(100 * time.Millisecond)

	// 发送请求
	resp := RequestWithTimeout(t, client, []byte("large"), 5*time.Second)
	t.Logf("Response size: %d bytes", len(resp))
	assert.Greater(t, len(resp), 1000, "Response should be large")
}

// TestMultipleMessages 测试多个消息处理
func TestMultipleMessages(t *testing.T) {
	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),
	}

	ts := StartTestServerWithRoutes(t, cfg, func(srv nnet.Server) {
		srv.Router().RegisterString("test", func(ctx nnet.Context) error {
			return ctx.Response().WriteBytes([]byte("ok\n"))
		})
	})
	defer CleanupTestServer(t, ts)

	client := NewTestClient(t, ts.Addr, nil)
	defer CleanupTestClient(t, client)

	ConnectTestClient(t, client)
	time.Sleep(100 * time.Millisecond)

	// 发送多个请求
	const numRequests = 10
	for i := 0; i < numRequests; i++ {
		resp := RequestWithTimeout(t, client, []byte("test"), 3*time.Second)
		assert.Contains(t, string(resp), "ok", "Request %d should succeed", i)
	}
}

// TestUnpacker 测试粘包拆包
func TestUnpacker(t *testing.T) {
	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,
		},
	}

	server, err := nnet.NewServer(cfg)
	require.NoError(t, err)

	// 注册协议
	pm := server.ProtocolManager()
	proto := internalprotocol.NewNNetProtocol("1.0")
	require.NoError(t, pm.Register(proto), "Should register protocol")

	var messageCount int
	server.Router().RegisterString("test", func(ctx nnet.Context) error {
		messageCount++
		return ctx.Response().WriteBytes([]byte("ok\n"))
	})

	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")
	time.Sleep(200 * time.Millisecond)

	defer CleanupTestServer(t, ts)

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

	ConnectTestClient(t, client)
	time.Sleep(100 * time.Millisecond)

	// 发送多个消息（粘包）
	testData := []byte("test")
	packet1, _ := proto.Encode(testData, nil)
	packet2, _ := proto.Encode(testData, nil)
	combinedPacket := append(packet1, packet2...)

	// 发送合并的数据包
	err = client.Send(combinedPacket)
	require.NoError(t, err, "Send should succeed")

	// 等待处理
	time.Sleep(200 * time.Millisecond)

	// 验证消息被正确拆包
	assert.GreaterOrEqual(t, messageCount, 1, "At least one message should be processed")
	t.Logf("Processed %d messages", messageCount)
}