package integration

import (
	"fmt"
	"net"
	"sync"
	"testing"
	"time"

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

// TestConcurrentRequests 测试并发请求
func TestConcurrentRequests(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)

	// 并发发送多个请求
	const numRequests = 10
	var wg sync.WaitGroup
	wg.Add(numRequests)

	results := make([]bool, numRequests)
	for i := 0; i < numRequests; i++ {
		go func(idx int) {
			defer wg.Done()
			resp, err := client.Request([]byte("test"), 3*time.Second)
			if err != nil {
				t.Logf("Request %d failed: %v", idx, err)
				results[idx] = false
			} else {
				results[idx] = string(resp) == "ok\n"
			}
		}(i)
	}

	wg.Wait()

	// 验证所有请求都成功
	successCount := 0
	for i, success := range results {
		if success {
			successCount++
		} else {
			t.Logf("Request %d failed", i)
		}
	}

	assert.Greater(t, successCount, numRequests/2, "At least half of requests should succeed")
	t.Logf("Success rate: %d/%d", successCount, numRequests)
}

// TestConcurrentClients 测试并发客户端
func TestConcurrentClients(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)

	// 并发创建多个客户端
	const numClients = 5
	var wg sync.WaitGroup
	wg.Add(numClients)

	clients := make([]nnet.Client, numClients)
	for i := 0; i < numClients; i++ {
		go func(idx int) {
			defer wg.Done()
			client := NewTestClient(t, ts.Addr, nil)
			err := client.Connect()
			if err != nil {
				t.Logf("Client %d failed to connect: %v", idx, err)
			} else {
				clients[idx] = client
			}
		}(i)
	}

	wg.Wait()
	time.Sleep(100 * time.Millisecond)

	// 所有客户端都应该能够发送请求
	successCount := 0
	for i, client := range clients {
		if client != nil && client.IsConnected() {
			resp, err := client.Request([]byte("test"), 3*time.Second)
			if err == nil && string(resp) == "ok\n" {
				successCount++
			} else {
				t.Logf("Client %d request failed: %v", i, err)
			}
		}
	}

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

	assert.Greater(t, successCount, 0, "At least one client should succeed")
	t.Logf("Success rate: %d/%d", successCount, numClients)
}

// TestServerStop 测试服务器停止
func TestServerStop(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"))
		})
	})

	// 创建客户端并发送请求
	client := NewTestClient(t, ts.Addr, nil)
	ConnectTestClient(t, client)

	time.Sleep(100 * time.Millisecond)

	// 发送请求
	resp := RequestWithTimeout(t, client, []byte("test"), 3*time.Second)
	assert.Contains(t, string(resp), "ok", "Request should succeed")

	// 停止服务器
	CleanupTestServer(t, ts)

	// 等待服务器停止
	require.Eventually(t, func() bool {
		return !ts.Server.Started()
	}, 3*time.Second, 50*time.Millisecond, "Server should stop")

	// 客户端应该断开连接
	require.Eventually(t, func() bool {
		return !client.IsConnected()
	}, 2*time.Second, 50*time.Millisecond, "Client should disconnect")

	CleanupTestClient(t, client)
}