package test

import (
	"testing"
	"time"

	"github.com/noahlann/nnet/internal/connection"
	"github.com/noahlann/nnet/pkg/errors"
)

func TestConnectionManager(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试添加连接
	conn := &mockConnectionInterface{id: "conn1"}
	if err := manager.Add(conn); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 测试获取连接
	retrievedConn, err := manager.Get("conn1")
	if err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	if retrievedConn.ID() != "conn1" {
		t.Error("Expected conn1")
	}

	// 测试连接数
	if manager.Count() != 1 {
		t.Errorf("Expected 1 connection, got: %d", manager.Count())
	}

	// 测试移除连接
	if err := manager.Remove("conn1"); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	if manager.Count() != 0 {
		t.Errorf("Expected 0 connections, got: %d", manager.Count())
	}
}

func TestConnectionManagerAddNil(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试添加 nil 连接
	err := manager.Add(nil)
	if err == nil {
		t.Error("Expected error for nil connection")
	}
}

func TestConnectionManagerMaxConnections(t *testing.T) {
	manager := connection.NewManager(2)

	// 添加第一个连接
	conn1 := &mockConnectionInterface{id: "conn1"}
	if err := manager.Add(conn1); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 添加第二个连接
	conn2 := &mockConnectionInterface{id: "conn2"}
	if err := manager.Add(conn2); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 尝试添加第三个连接（应该失败）
	conn3 := &mockConnectionInterface{id: "conn3"}
	err := manager.Add(conn3)
	if err == nil {
		t.Error("Expected error for exceeding max connections")
	}
}

func TestConnectionManagerGetNotFound(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试获取不存在的连接
	_, err := manager.Get("nonexistent")
	if err == nil {
		t.Error("Expected error for nonexistent connection")
	}
	if err != errors.ErrConnectionNotFound {
		t.Errorf("Expected ErrConnectionNotFound, got: %v", err)
	}
}

func TestConnectionManagerRemoveNotFound(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试移除不存在的连接
	err := manager.Remove("nonexistent")
	if err == nil {
		t.Error("Expected error for nonexistent connection")
	}
	if err != errors.ErrConnectionNotFound {
		t.Errorf("Expected ErrConnectionNotFound, got: %v", err)
	}
}

func TestConnectionManagerGetAll(t *testing.T) {
	manager := connection.NewManager(100)

	// 添加多个连接
	conn1 := &mockConnectionInterface{id: "conn1"}
	conn2 := &mockConnectionInterface{id: "conn2"}
	conn3 := &mockConnectionInterface{id: "conn3"}

	manager.Add(conn1)
	manager.Add(conn2)
	manager.Add(conn3)

	// 获取所有连接
	allConns := manager.GetAll()
	if len(allConns) != 3 {
		t.Errorf("Expected 3 connections, got: %d", len(allConns))
	}
}

func TestConnectionGroup(t *testing.T) {
	manager := connection.NewManager(100)

	conn1 := &mockConnectionInterface{id: "conn1"}
	conn2 := &mockConnectionInterface{id: "conn2"}

	manager.Add(conn1)
	manager.Add(conn2)

	// 添加到分组
	if err := manager.AddToGroup("group1", "conn1"); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	if err := manager.AddToGroup("group1", "conn2"); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 获取分组
	group := manager.GetGroup("group1")
	if len(group) != 2 {
		t.Errorf("Expected 2 connections in group, got: %d", len(group))
	}
}

func TestConnectionGroupNotFound(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试获取不存在的分组
	group := manager.GetGroup("nonexistent")
	if group != nil && len(group) != 0 {
		t.Error("Expected empty group for nonexistent group")
	}
}

func TestConnectionGroupAddToGroupNotFound(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试将不存在的连接添加到分组
	err := manager.AddToGroup("group1", "nonexistent")
	if err == nil {
		t.Error("Expected error for nonexistent connection")
	}
	if err != errors.ErrConnectionNotFound {
		t.Errorf("Expected ErrConnectionNotFound, got: %v", err)
	}
}

func TestConnectionGroupRemoveFromGroup(t *testing.T) {
	manager := connection.NewManager(100)

	conn1 := &mockConnectionInterface{id: "conn1"}
	manager.Add(conn1)

	// 添加到分组
	manager.AddToGroup("group1", "conn1")

	// 从分组中移除
	if err := manager.RemoveFromGroup("group1", "conn1"); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 验证分组为空
	group := manager.GetGroup("group1")
	if group != nil && len(group) != 0 {
		t.Error("Expected empty group after removal")
	}
}

func TestConnectionGroupRemoveFromGroupNotFound(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试从不存在的分组中移除连接
	err := manager.RemoveFromGroup("nonexistent", "conn1")
	if err != nil {
		t.Errorf("Expected no error for nonexistent group, got: %v", err)
	}
}

func TestConnectionGroupBroadcast(t *testing.T) {
	manager := connection.NewManager(100)

	conn1 := &mockConnectionInterface{id: "conn1", writeData: make(chan []byte, 1)}
	conn2 := &mockConnectionInterface{id: "conn2", writeData: make(chan []byte, 1)}

	manager.Add(conn1)
	manager.Add(conn2)

	// 添加到分组
	manager.AddToGroup("group1", "conn1")
	manager.AddToGroup("group1", "conn2")

	// 广播消息
	data := []byte("broadcast message")
	if err := manager.BroadcastToGroup("group1", data); err != nil {
		t.Errorf("Expected no error, got: %v", err)
	}

	// 验证两个连接都收到了消息
	select {
	case msg := <-conn1.writeData:
		if string(msg) != string(data) {
			t.Errorf("Expected %s, got %s", string(data), string(msg))
		}
	case <-time.After(100 * time.Millisecond):
		t.Error("Timeout waiting for message on conn1")
	}

	select {
	case msg := <-conn2.writeData:
		if string(msg) != string(data) {
			t.Errorf("Expected %s, got %s", string(data), string(msg))
		}
	case <-time.After(100 * time.Millisecond):
		t.Error("Timeout waiting for message on conn2")
	}
}

func TestConnectionGroupBroadcastEmptyGroup(t *testing.T) {
	manager := connection.NewManager(100)

	// 测试向空分组广播
	err := manager.BroadcastToGroup("empty_group", []byte("test"))
	if err != nil {
		t.Errorf("Expected no error for empty group, got: %v", err)
	}
}

func TestConnectionManagerCleanupInactive(t *testing.T) {
	manager := connection.NewManager(100)

	conn1 := &mockConnectionInterfaceWithLastActive{
		mockConnectionInterface: mockConnectionInterface{id: "conn1"},
		lastActive:              time.Now().Add(-40 * time.Second),
	}
	conn2 := &mockConnectionInterfaceWithLastActive{
		mockConnectionInterface: mockConnectionInterface{id: "conn2"},
		lastActive:              time.Now(),
	}

	manager.Add(conn1)
	manager.Add(conn2)

	// 清理非活动连接（30秒超时）
	manager.CleanupInactive(30 * time.Second)

	// 验证 conn1 被移除，conn2 保留
	if manager.Count() != 1 {
		t.Errorf("Expected 1 connection after cleanup, got: %d", manager.Count())
	}

	_, err := manager.Get("conn1")
	if err == nil {
		t.Error("Expected conn1 to be removed")
	}

	_, err = manager.Get("conn2")
	if err != nil {
		t.Error("Expected conn2 to be retained")
	}
}

func TestConnectionManagerCleanupInactiveInvalidTimeout(t *testing.T) {
	manager := connection.NewManager(100)

	conn1 := &mockConnectionInterface{id: "conn1"}
	manager.Add(conn1)

	// 测试无效的超时类型
	manager.CleanupInactive("invalid")

	// 验证连接没有被移除
	if manager.Count() != 1 {
		t.Errorf("Expected 1 connection, got: %d", manager.Count())
	}
}

// mockConnectionInterface 模拟连接接口
type mockConnectionInterface struct {
	id        string
	writeData chan []byte
}

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

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

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

func (m *mockConnectionInterface) Write(data []byte) error {
	if m.writeData != nil {
		m.writeData <- data
	}
	return nil
}

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

// mockConnectionInterfaceWithLastActive 带最后活动时间的连接
type mockConnectionInterfaceWithLastActive struct {
	mockConnectionInterface
	lastActive time.Time
}

func (m *mockConnectionInterfaceWithLastActive) LastActive() time.Time {
	return m.lastActive
}