using System;
using System.Drawing;
using System.Windows.Forms;

namespace KSTools.Licensing
{
    /// <summary>
    /// 授權啟用對話框
    /// 提供用戶友好的授權碼輸入界面
    /// </summary>
    public partial class LicenseActivationDialog : Form
    {
        /// <summary>
        /// 用戶輸入的授權碼
        /// </summary>
        public string LicenseCode { get; private set; }
        
        private TextBox txtLicenseCode;
        private TextBox txtHardwareId;
        private Button btnActivate;
        private Button btnCancel;
        private Button btnCopyHardwareId;
        private Label lblInstructions;
        private Label lblHardwareId;
        private Label lblLicenseCode;
        private PictureBox picIcon;
        
        /// <summary>
        /// 初始化授權啟用對話框
        /// </summary>
        /// <param name="hardwareId">硬體指紋ID</param>
        public LicenseActivationDialog(string hardwareId)
        {
            InitializeComponent();
            txtHardwareId.Text = hardwareId;
            
            // 設定對話框屬性
            this.StartPosition = FormStartPosition.CenterScreen;
            this.FormBorderStyle = FormBorderStyle.FixedDialog;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.ShowInTaskbar = false;
        }
        
        /// <summary>
        /// 初始化組件
        /// </summary>
        private void InitializeComponent()
        {
            this.txtLicenseCode = new TextBox();
            this.txtHardwareId = new TextBox();
            this.btnActivate = new Button();
            this.btnCancel = new Button();
            this.btnCopyHardwareId = new Button();
            this.lblInstructions = new Label();
            this.lblHardwareId = new Label();
            this.lblLicenseCode = new Label();
            this.picIcon = new PictureBox();
            
            ((System.ComponentModel.ISupportInitialize)(this.picIcon)).BeginInit();
            this.SuspendLayout();
            
            // 
            // picIcon
            // 
            this.picIcon.Location = new Point(12, 12);
            this.picIcon.Size = new Size(48, 48);
            this.picIcon.SizeMode = PictureBoxSizeMode.StretchImage;
            // 這裡可以設定圖示，例如：this.picIcon.Image = Properties.Resources.KSToolsIcon;
            
            // 
            // lblInstructions
            // 
            this.lblInstructions.AutoSize = false;
            this.lblInstructions.Location = new Point(76, 12);
            this.lblInstructions.Size = new Size(380, 60);
            this.lblInstructions.Text = "歡迎使用 KSTools！\n\n" +
                                      "請將下方的硬體 ID 提供給管理員以取得授權碼，\n" +
                                      "然後在下方輸入授權碼進行啟用。";
            this.lblInstructions.Font = new Font("Microsoft JhengHei", 9F, FontStyle.Regular);
            
            // 
            // lblHardwareId
            // 
            this.lblHardwareId.AutoSize = true;
            this.lblHardwareId.Location = new Point(12, 85);
            this.lblHardwareId.Size = new Size(68, 15);
            this.lblHardwareId.Text = "硬體 ID：";
            this.lblHardwareId.Font = new Font("Microsoft JhengHei", 9F, FontStyle.Bold);
            
            // 
            // txtHardwareId
            // 
            this.txtHardwareId.Location = new Point(12, 105);
            this.txtHardwareId.Size = new Size(350, 25);
            this.txtHardwareId.ReadOnly = true;
            this.txtHardwareId.BackColor = Color.LightGray;
            this.txtHardwareId.Font = new Font("Consolas", 9F, FontStyle.Regular);
            
            // 
            // btnCopyHardwareId
            // 
            this.btnCopyHardwareId.Location = new Point(370, 105);
            this.btnCopyHardwareId.Size = new Size(75, 25);
            this.btnCopyHardwareId.Text = "複製";
            this.btnCopyHardwareId.UseVisualStyleBackColor = true;
            this.btnCopyHardwareId.Click += new EventHandler(this.btnCopyHardwareId_Click);
            
            // 
            // lblLicenseCode
            // 
            this.lblLicenseCode.AutoSize = true;
            this.lblLicenseCode.Location = new Point(12, 145);
            this.lblLicenseCode.Size = new Size(68, 15);
            this.lblLicenseCode.Text = "授權碼：";
            this.lblLicenseCode.Font = new Font("Microsoft JhengHei", 9F, FontStyle.Bold);
            
            // 
            // txtLicenseCode
            // 
            this.txtLicenseCode.Location = new Point(12, 165);
            this.txtLicenseCode.Size = new Size(433, 25);
            this.txtLicenseCode.Font = new Font("Consolas", 10F, FontStyle.Regular);
            this.txtLicenseCode.CharacterCasing = CharacterCasing.Upper;
            this.txtLicenseCode.MaxLength = 50;
            this.txtLicenseCode.TextChanged += new EventHandler(this.txtLicenseCode_TextChanged);
            this.txtLicenseCode.KeyPress += new KeyPressEventHandler(this.txtLicenseCode_KeyPress);
            
            // 
            // btnActivate
            // 
            this.btnActivate.Location = new Point(280, 210);
            this.btnActivate.Size = new Size(80, 30);
            this.btnActivate.Text = "啟用";
            this.btnActivate.UseVisualStyleBackColor = true;
            this.btnActivate.Enabled = false;
            this.btnActivate.Font = new Font("Microsoft JhengHei", 9F, FontStyle.Bold);
            this.btnActivate.Click += new EventHandler(this.btnActivate_Click);
            
            // 
            // btnCancel
            // 
            this.btnCancel.Location = new Point(370, 210);
            this.btnCancel.Size = new Size(80, 30);
            this.btnCancel.Text = "取消";
            this.btnCancel.UseVisualStyleBackColor = true;
            this.btnCancel.DialogResult = DialogResult.Cancel;
            
            // 
            // LicenseActivationDialog
            // 
            this.AcceptButton = this.btnActivate;
            this.CancelButton = this.btnCancel;
            this.ClientSize = new Size(467, 260);
            this.Controls.Add(this.btnCancel);
            this.Controls.Add(this.btnActivate);
            this.Controls.Add(this.txtLicenseCode);
            this.Controls.Add(this.lblLicenseCode);
            this.Controls.Add(this.btnCopyHardwareId);
            this.Controls.Add(this.txtHardwareId);
            this.Controls.Add(this.lblHardwareId);
            this.Controls.Add(this.lblInstructions);
            this.Controls.Add(this.picIcon);
            this.Font = new Font("Microsoft JhengHei", 9F, FontStyle.Regular);
            this.Text = "KSTools 授權啟用";
            
            ((System.ComponentModel.ISupportInitialize)(this.picIcon)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();
        }
        
        /// <summary>
        /// 複製硬體ID到剪貼簿
        /// </summary>
        private void btnCopyHardwareId_Click(object sender, EventArgs e)
        {
            try
            {
                Clipboard.SetText(txtHardwareId.Text);
                MessageBox.Show("硬體 ID 已複製到剪貼簿！", "複製成功", 
                              MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"複製失敗：{ex.Message}", "錯誤", 
                              MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        
        /// <summary>
        /// 授權碼文字變更事件
        /// </summary>
        private void txtLicenseCode_TextChanged(object sender, EventArgs e)
        {
            // 檢查授權碼格式並啟用/停用啟用按鈕
            string licenseCode = txtLicenseCode.Text.Trim();
            
            // 基本格式檢查：以KS開頭且長度合適
            bool isValidFormat = licenseCode.StartsWith("KS") && licenseCode.Length >= 8 && licenseCode.Length <= 20;
            
            btnActivate.Enabled = isValidFormat;
            
            // 變更文字顏色提示
            if (string.IsNullOrEmpty(licenseCode))
            {
                txtLicenseCode.ForeColor = Color.Black;
            }
            else if (isValidFormat)
            {
                txtLicenseCode.ForeColor = Color.Green;
            }
            else
            {
                txtLicenseCode.ForeColor = Color.Red;
            }
        }
        
        /// <summary>
        /// 授權碼按鍵事件
        /// </summary>
        private void txtLicenseCode_KeyPress(object sender, KeyPressEventArgs e)
        {
            // 只允許英數字元
            if (!char.IsLetterOrDigit(e.KeyChar) && !char.IsControl(e.KeyChar))
            {
                e.Handled = true;
            }
        }
        
        /// <summary>
        /// 啟用按鈕點擊事件
        /// </summary>
        private void btnActivate_Click(object sender, EventArgs e)
        {
            string licenseCode = txtLicenseCode.Text.Trim().ToUpper();
            
            if (string.IsNullOrEmpty(licenseCode))
            {
                MessageBox.Show("請輸入授權碼！", "輸入錯誤", 
                              MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtLicenseCode.Focus();
                return;
            }
            
            if (!licenseCode.StartsWith("KS"))
            {
                MessageBox.Show("授權碼格式錯誤！授權碼必須以 'KS' 開頭。", "格式錯誤", 
                              MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtLicenseCode.Focus();
                return;
            }
            
            // 確認對話框
            var confirmResult = MessageBox.Show(
                $"確定要使用授權碼 '{licenseCode}' 進行啟用嗎？\n\n" +
                $"授權碼將與此電腦的硬體 ID 綁定，無法轉移到其他電腦使用。",
                "確認啟用",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Question);
            
            if (confirmResult == DialogResult.Yes)
            {
                this.LicenseCode = licenseCode;
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
        }
        
        /// <summary>
        /// 表單載入事件
        /// </summary>
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            
            // 聚焦到授權碼輸入框
            txtLicenseCode.Focus();
            
            // 設定提示訊息
            this.ShowTips();
        }
        
        /// <summary>
        /// 顯示使用提示
        /// </summary>
        private void ShowTips()
        {
            var tips = "使用提示：\n\n" +
                      "1. 請將上方的硬體 ID 提供給系統管理員\n" +
                      "2. 管理員會為您生成專屬的授權碼\n" +
                      "3. 在授權碼輸入框中輸入完整的授權碼\n" +
                      "4. 授權碼格式：KS + 數字字母組合\n" +
                      "5. 每個授權碼只能在一台電腦上使用\n\n" +
                      "如有問題請聯絡技術支援。";
            
            // 可以在這裡顯示提示，或者加入幫助按鈕
        }
    }
}