package interceptor

import (
	"errors"
	"testing"

	"github.com/noahlann/nnet/internal/codec"
	"github.com/noahlann/nnet/internal/request"
	"github.com/noahlann/nnet/internal/response"
	ctxpkg "github.com/noahlann/nnet/pkg/context"
	interceptorpkg "github.com/noahlann/nnet/pkg/interceptor"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestInterceptorChain(t *testing.T) {
	// 创建测试Context
	conn := &mockConnection{id: "test-conn"}
	req := request.New([]byte("test"), nil)
	codecRegistry := codec.NewRegistry()
	resp := response.New(conn, nil, codecRegistry, "json")
	ctx := ctxpkg.New(nil, conn, req, resp)

	// 创建拦截器链
	callOrder := make([]int, 0)
	interceptor1 := interceptorpkg.HandlerFunc(func(data []byte, ctx ctxpkg.Context, next interceptorpkg.Chain) ([]byte, bool, error) {
		callOrder = append(callOrder, 1)
		return next.Next(data, ctx)
	})
	interceptor2 := interceptorpkg.HandlerFunc(func(data []byte, ctx ctxpkg.Context, next interceptorpkg.Chain) ([]byte, bool, error) {
		callOrder = append(callOrder, 2)
		return next.Next(data, ctx)
	})

	chain := NewChain(interceptor1, interceptor2)

	// 执行拦截器链
	data := []byte("test")
	result, continue_, err := chain.Next(data, ctx)
	require.NoError(t, err, "Expected no error")
	assert.True(t, continue_, "Expected continue to be true")
	assert.Equal(t, data, result, "Expected data to be unchanged")

	// 验证执行顺序
	assert.Equal(t, []int{1, 2}, callOrder, "Expected call order to be 1, 2")
}

func TestInterceptorChainEmpty(t *testing.T) {
	conn := &mockConnection{id: "test-conn"}
	req := request.New([]byte("test"), nil)
	codecRegistry := codec.NewRegistry()
	resp := response.New(conn, nil, codecRegistry, "json")
	ctx := ctxpkg.New(nil, conn, req, resp)

	chain := NewChain()

	// 空的拦截器链应该直接返回数据
	data := []byte("test")
	result, continue_, err := chain.Next(data, ctx)
	require.NoError(t, err, "Expected no error")
	assert.True(t, continue_, "Expected continue to be true")
	assert.Equal(t, data, result, "Expected data to be unchanged")
}

func TestInterceptorChainError(t *testing.T) {
	conn := &mockConnection{id: "test-conn"}
	req := request.New([]byte("test"), nil)
	codecRegistry := codec.NewRegistry()
	resp := response.New(conn, nil, codecRegistry, "json")
	ctx := ctxpkg.New(nil, conn, req, resp)

	// 创建会返回错误的拦截器
	testError := errors.New("interceptor error")
	interceptor1 := interceptorpkg.HandlerFunc(func(data []byte, ctx ctxpkg.Context, next interceptorpkg.Chain) ([]byte, bool, error) {
		return nil, false, testError
	})

	chain := NewChain(interceptor1)

	// 执行拦截器链（应该返回错误）
	data := []byte("test")
	_, continue_, err := chain.Next(data, ctx)
	assert.Error(t, err, "Expected error from interceptor")
	assert.False(t, continue_, "Expected continue to be false")
	assert.Equal(t, testError, err, "Expected interceptor error")
}

func TestInterceptorChainStop(t *testing.T) {
	conn := &mockConnection{id: "test-conn"}
	req := request.New([]byte("test"), nil)
	codecRegistry := codec.NewRegistry()
	resp := response.New(conn, nil, codecRegistry, "json")
	ctx := ctxpkg.New(nil, conn, req, resp)

	// 创建会停止链的拦截器
	interceptor1 := interceptorpkg.HandlerFunc(func(data []byte, ctx ctxpkg.Context, next interceptorpkg.Chain) ([]byte, bool, error) {
		return []byte("modified"), false, nil // 停止链，返回修改后的数据
	})

	chain := NewChain(interceptor1)

	// 执行拦截器链
	data := []byte("test")
	result, continue_, err := chain.Next(data, ctx)
	require.NoError(t, err, "Expected no error")
	assert.False(t, continue_, "Expected continue to be false")
	assert.Equal(t, []byte("modified"), result, "Expected modified data")
}

func TestExecute(t *testing.T) {
	conn := &mockConnection{id: "test-conn"}
	req := request.New([]byte("test"), nil)
	codecRegistry := codec.NewRegistry()
	resp := response.New(conn, nil, codecRegistry, "json")
	ctx := ctxpkg.New(nil, conn, req, resp)

	interceptor1 := interceptorpkg.HandlerFunc(func(data []byte, ctx ctxpkg.Context, next interceptorpkg.Chain) ([]byte, bool, error) {
		return next.Next(data, ctx)
	})

	data := []byte("test")
	result, continue_, err := Execute(data, ctx, interceptor1)
	require.NoError(t, err)
	assert.True(t, continue_)
	assert.Equal(t, data, result)
}

// mockConnection 模拟连接
type mockConnection struct {
	id string
}

func (m *mockConnection) ID() string {
	return m.id
}

func (m *mockConnection) RemoteAddr() string {
	return "127.0.0.1:6995"
}

func (m *mockConnection) LocalAddr() string {
	return "127.0.0.1:6995"
}

func (m *mockConnection) Write(data []byte) error {
	return nil
}

func (m *mockConnection) Close() error {
	return nil
}