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"
)

// TestCodecResolver 测试Codec解析器链
func TestCodecResolver(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",
		},
	}

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

	// 获取Codec注册表（用于验证）
	codecRegistry := server.CodecRegistry()
	require.NotNil(t, codecRegistry, "Codec registry should not be nil")

	// 注意：Codec解析器链的注册需要通过内部实现
	// 这里只测试默认的解析器链行为
	_ = codecRegistry

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

	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, nil)
	defer CleanupTestClient(t, client)

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

	// 发送请求
	resp := RequestWithTimeout(t, client, []byte("test"), 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, "ok", result["status"], "Status should be ok")
}

// TestCodecAutoDetection 测试Codec自动检测
func TestCodecAutoDetection(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("test", func(ctx nnet.Context) error {
			// 返回请求的数据类型
			data := ctx.Request().Data()
			return ctx.Response().Write(map[string]any{
				"data":   data,
				"status": "ok",
			})
		})
	})
	defer CleanupTestServer(t, ts)

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

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

	// 发送JSON数据
	jsonData := `{"test":"data"}`
	resp := RequestWithTimeout(t, client, []byte(jsonData), 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, "ok", result["status"], "Status should be ok")
}