package integration

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

	internalprotocol "git.noahlan.cn/noahlan/nnet/v2/internal/protocol/nnet"
	"git.noahlan.cn/noahlan/nnet/v2/pkg/nnet"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// TestProtocolFrameHeader 测试协议帧头匹配
func TestProtocolFrameHeader(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")

	// 注册帧头匹配路由：nnet帧头包含magic/version/length/checksum等字段。
	server.Router().RegisterFrameHeader("version", "==", byte(1), func(ctx nnet.Context) error {
		return ctx.Response().Write(map[string]any{
			"op":     "pong",
			"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)

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

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

	pingData := []byte(`{"op":"ping"}`)
	resp := RequestWithTimeout(t, client, pingData, 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, "pong", result["op"], "Op should be pong")
	assert.Equal(t, "ok", result["status"], "Status should be ok")
}

// TestProtocolFrameData 测试协议帧数据匹配
func TestProtocolFrameData(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")

	// 注册帧数据匹配路由
	server.Router().RegisterFrameData("action", "==", "test", func(ctx nnet.Context) error {
		return ctx.Response().Write(map[string]any{
			"action": "test",
			"result": "success",
		})
	})

	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)

	testData := []byte(`{"action":"test"}`)
	resp := RequestWithTimeout(t, client, testData, 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, "test", result["action"], "Action should be test")
	assert.Equal(t, "success", result["result"], "Result should be success")
}