using System;
using System.Text;
using System.Windows.Forms;
using System.Management;
using System.Net.NetworkInformation;
using System.Collections.Generic;
using System.IO;
using System.Configuration;
using System.Linq;
using CnasSynchronousCommon;

namespace CNAS_DBSync
{
    public partial class ActivationForm : Form
    {
        private const string ACTIVATION_FILE = "activation.config";
        
        public bool IsActivated { get; private set; }

        public ActivationForm()
        {
            InitializeComponent();
            IsActivated = false;
        }

        // 检查是否已激活
        public   bool CheckActivation()
        {
            try
            {
                string activationPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, ACTIVATION_FILE);
                if (File.Exists(activationPath))
                {
                    string machineCode = MachieCodeHelper.GetMachineCode();
                    string savedMachineCode = File.ReadAllText(activationPath);
                    return machineCode == savedMachineCode;
                }
            }
            catch
            {
                // 如果读取失败，返回未激活状态
            }
            return false;
        }

        private  void SaveActivation()
        {
            try
            {
                string activationPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, ACTIVATION_FILE);
                File.WriteAllText(activationPath, MachieCodeHelper.GetMachineCode());
            }
            catch (Exception ex)
            {
                MessageBox.Show($"保存激活状态失败：{ex.Message}", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }

        private void btnActivate_Click(object sender, EventArgs e)
        {
            string activationCode = txtActivationCode.Text.Trim();
            if (string.IsNullOrEmpty(activationCode))
            {
                MessageBox.Show("请输入激活码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            try
            {
                //绕过验证
                if (ValidateActivationCode(activationCode))
                {
                    IsActivated = true;
                    SaveActivation(); // 保存激活状态
                    this.DialogResult = DialogResult.OK;
                    this.Close();
                }
                else
                {
                    MessageBox.Show("激活码无效！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"激活失败：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void lnkDownloadCode_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            try
            {
                string machineCode = MachieCodeHelper.GetMachineCode();
                
                // 创建保存文件对话框
                var saveFileDialog = new SaveFileDialog
                {
                    FileName = $"机器码_{DateTime.Now:yyyyMMdd}",
                    DefaultExt = ".txt",
                    Filter = "文本文件|*.txt"
                };

                if (saveFileDialog.ShowDialog() == DialogResult.OK)
                {
                    File.WriteAllText(saveFileDialog.FileName, machineCode);
                    MessageBox.Show("机器码已成功保存！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"获取机器码失败：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

      

        private bool ValidateActivationCode(string activationCode)
        {
            // 使用实际的机器码来验证
            string machineCode = MachieCodeHelper.GetMachineCode();
            return GenerateActivationCode(machineCode) == activationCode;
        }

        private string GenerateActivationCode(string machineCode)
        {
            // 这里实现激活码生成算法
            // 示例：简单的加密算法，实际应用中应该使用更安全的加密方式
            using (var md5 = System.Security.Cryptography.MD5.Create())
            {
                // 加入时间戳使得生成的激活码具有时效性
                string input = machineCode + DateTime.Now.ToString("yyyyMMdd");
                byte[] inputBytes = Encoding.UTF8.GetBytes(input);
                byte[] hashBytes = md5.ComputeHash(inputBytes);

                // 转换为16进制字符串
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i++)
                {
                    sb.Append(hashBytes[i].ToString("X2"));
                    // 每4个字符添加一个分隔符，提高可读性
                    if ((i + 1) % 4 == 0 && i != hashBytes.Length - 1)
                    {
                        sb.Append("-");
                    }
                }
                return sb.ToString();
            }
        }
    }
}