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"
)

// TestMiddlewareChain 测试中间件链
func TestMiddlewareChain(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) {
		// 创建路由分组并添加多个中间件
		group := srv.Router().Group()

		// 第一个中间件：设置值
		group.Use(func(ctx nnet.Context) error {
			ctx.Set("middleware1", "executed")
			return nil
		})

		// 第二个中间件：修改值
		group.Use(func(ctx nnet.Context) error {
			ctx.Set("middleware2", "executed")
			if val := ctx.GetString("middleware1"); val != "" {
				ctx.Set("middleware1", val+"-modified")
			}
			return nil
		})

		// 注册路由
		group.RegisterString("test", func(ctx nnet.Context) error {
			mw1 := ctx.GetString("middleware1")
			mw2 := ctx.GetString("middleware2")
			return ctx.Response().Write(map[string]any{
				"middleware1": mw1,
				"middleware2": mw2,
			})
		})
	})
	defer CleanupTestServer(t, ts)

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

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

	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, "executed-modified", result["middleware1"], "Middleware1 should be executed and modified")
	assert.Equal(t, "executed", result["middleware2"], "Middleware2 should be executed")
}

// TestGlobalMiddleware 测试全局中间件
func TestGlobalMiddleware(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) {
		// 创建路由分组并添加全局中间件
		group := srv.Router().Group()
		group.Use(func(ctx nnet.Context) error {
			ctx.Set("global", "executed")
			return nil
		})

		// 注册路由到分组
		group.RegisterString("test", func(ctx nnet.Context) error {
			global := ctx.GetString("global")
			return ctx.Response().Write(map[string]any{
				"global": global,
			})
		})
	})
	defer CleanupTestServer(t, ts)

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

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

	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, "executed", result["global"], "Global middleware should be executed")
}

// TestMiddlewareError 测试中间件错误处理
func TestMiddlewareError(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) {
		group := srv.Router().Group()

		// 中间件返回错误
		group.Use(func(ctx nnet.Context) error {
			return fmt.Errorf("middleware error")
		})

		// 注册路由（不应该被执行）
		group.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)

	// 发送请求
	resp, err := client.Request([]byte("test"), 3*time.Second)
	if err != nil {
		// 如果请求失败，这是预期的行为
		t.Logf("Request failed as expected: %v", err)
		assert.Error(t, err, "Request should fail due to middleware error")
	} else {
		// 如果收到响应，应该是错误响应
		t.Logf("Response: %q", string(resp))
		assert.NotEmpty(t, resp, "Response should not be empty")
	}
}