using System;
using System.Windows.Forms;
using System.IO;
using nsoftware.SecureBlackbox;

namespace PKCS11CertificateStorage
{
	/// <summary>
	/// Summary description for ProcessorForm.
	/// </summary>
	public class frmProcessor : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lbInputFile;
		private System.Windows.Forms.TextBox edInputFile;
		private System.Windows.Forms.Button btnSelectInput;
		private System.Windows.Forms.Button btnSelectOutput;
		private System.Windows.Forms.TextBox edOutputFile;
		private System.Windows.Forms.Label lbOutputFile;
		private System.Windows.Forms.Button btnSign;
		private System.Windows.Forms.Button btnVerify;
		private System.Windows.Forms.OpenFileDialog dlgOpen;
		private System.Windows.Forms.SaveFileDialog dlgSave;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Certificate Cert;
		private PDFSigner signer;
        private Button btnClose;
        private PDFVerifier verifier;

		public frmProcessor()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
			signer = new PDFSigner();
            verifier = new PDFVerifier();
        }

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
					signer.Dispose();
					verifier.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
            this.lbInputFile = new System.Windows.Forms.Label();
            this.edInputFile = new System.Windows.Forms.TextBox();
            this.btnSelectInput = new System.Windows.Forms.Button();
            this.btnSelectOutput = new System.Windows.Forms.Button();
            this.edOutputFile = new System.Windows.Forms.TextBox();
            this.lbOutputFile = new System.Windows.Forms.Label();
            this.btnSign = new System.Windows.Forms.Button();
            this.btnVerify = new System.Windows.Forms.Button();
            this.dlgOpen = new System.Windows.Forms.OpenFileDialog();
            this.dlgSave = new System.Windows.Forms.SaveFileDialog();
            this.btnClose = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // lbInputFile
            // 
            this.lbInputFile.Location = new System.Drawing.Point(16, 16);
            this.lbInputFile.Name = "lbInputFile";
            this.lbInputFile.Size = new System.Drawing.Size(100, 16);
            this.lbInputFile.TabIndex = 0;
            this.lbInputFile.Text = "Input File:";
            // 
            // edInputFile
            // 
            this.edInputFile.Location = new System.Drawing.Point(16, 32);
            this.edInputFile.Name = "edInputFile";
            this.edInputFile.Size = new System.Drawing.Size(261, 20);
            this.edInputFile.TabIndex = 1;
            // 
            // btnSelectInput
            // 
            this.btnSelectInput.Location = new System.Drawing.Point(283, 30);
            this.btnSelectInput.Name = "btnSelectInput";
            this.btnSelectInput.Size = new System.Drawing.Size(75, 23);
            this.btnSelectInput.TabIndex = 2;
            this.btnSelectInput.Text = "Browse...";
            this.btnSelectInput.Click += new System.EventHandler(this.btnSelectInput_Click);
            // 
            // btnSelectOutput
            // 
            this.btnSelectOutput.Location = new System.Drawing.Point(283, 78);
            this.btnSelectOutput.Name = "btnSelectOutput";
            this.btnSelectOutput.Size = new System.Drawing.Size(75, 23);
            this.btnSelectOutput.TabIndex = 5;
            this.btnSelectOutput.Text = "Browse...";
            this.btnSelectOutput.Click += new System.EventHandler(this.btnSelectOutput_Click);
            // 
            // edOutputFile
            // 
            this.edOutputFile.Location = new System.Drawing.Point(16, 80);
            this.edOutputFile.Name = "edOutputFile";
            this.edOutputFile.Size = new System.Drawing.Size(261, 20);
            this.edOutputFile.TabIndex = 4;
            // 
            // lbOutputFile
            // 
            this.lbOutputFile.Location = new System.Drawing.Point(16, 64);
            this.lbOutputFile.Name = "lbOutputFile";
            this.lbOutputFile.Size = new System.Drawing.Size(100, 16);
            this.lbOutputFile.TabIndex = 3;
            this.lbOutputFile.Text = "Output File:";
            // 
            // btnSign
            // 
            this.btnSign.Location = new System.Drawing.Point(202, 125);
            this.btnSign.Name = "btnSign";
            this.btnSign.Size = new System.Drawing.Size(75, 23);
            this.btnSign.TabIndex = 6;
            this.btnSign.Text = "Sign";
            this.btnSign.Click += new System.EventHandler(this.btnSign_Click);
            // 
            // btnVerify
            // 
            this.btnVerify.Location = new System.Drawing.Point(283, 125);
            this.btnVerify.Name = "btnVerify";
            this.btnVerify.Size = new System.Drawing.Size(75, 23);
            this.btnVerify.TabIndex = 7;
            this.btnVerify.Text = "Verify";
            this.btnVerify.Click += new System.EventHandler(this.btnVerify_Click);
            // 
            // dlgOpen
            // 
            this.dlgOpen.Filter = "All files (*.*)|*.*";
            // 
            // dlgSave
            // 
            this.dlgSave.DefaultExt = "All files (*.*)|*.*";
            // 
            // btnClose
            // 
            this.btnClose.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.btnClose.Location = new System.Drawing.Point(283, 166);
            this.btnClose.Name = "btnClose";
            this.btnClose.Size = new System.Drawing.Size(75, 23);
            this.btnClose.TabIndex = 10;
            this.btnClose.Text = "Close";
            // 
            // frmProcessor
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(375, 201);
            this.Controls.Add(this.btnClose);
            this.Controls.Add(this.btnVerify);
            this.Controls.Add(this.btnSign);
            this.Controls.Add(this.btnSelectOutput);
            this.Controls.Add(this.edOutputFile);
            this.Controls.Add(this.lbOutputFile);
            this.Controls.Add(this.btnSelectInput);
            this.Controls.Add(this.edInputFile);
            this.Controls.Add(this.lbInputFile);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "frmProcessor";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
            this.Text = "File processor";
            this.ResumeLayout(false);
            this.PerformLayout();

		}
		#endregion

		private void btnSelectInput_Click(object sender, System.EventArgs e)
		{
			if (dlgOpen.ShowDialog() == DialogResult.OK)
				edInputFile.Text = dlgOpen.FileName;
		}

		private void btnSelectOutput_Click(object sender, System.EventArgs e)
		{
			if (dlgSave.ShowDialog() == DialogResult.OK)
				edOutputFile.Text = dlgSave.FileName;
		}

		private void btnSign_Click(object sender, System.EventArgs e)
		{
            signer.InputFile = edInputFile.Text;
            signer.OutputFile = edOutputFile.Text;

            signer.SigningCertificate = Cert;

            if (signer.SigningCertificate.KeyAlgorithm.Contains("id-dsa"))
            {
                MessageBox.Show("The certificate was found to contain a DSA key. The hash algorithm has been switched to SHA1.");

                signer.NewSignature.HashAlgorithm = "SHA1";
            }

            signer.NewSignature.Level = PAdESSignatureLevels.paslBES;
            signer.Widget.Invisible = false;
            signer.IgnoreChainValidationErrors = true;

            try
            {
                signer.Sign();

                MessageBox.Show("PDF file successfully signed");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            signer.SigningCertificate = null;
        }

		private void btnVerify_Click(object sender, System.EventArgs e)
		{
            try
            {
                verifier.InputFile = edInputFile.Text;
                verifier.IgnoreChainValidationErrors = true;
                verifier.KnownCertificates.Clear();
                verifier.KnownCertificates.Add(Cert);

                verifier.Verify();

                DisplaySignaturesInfo();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void DisplaySignaturesInfo()
        {
            ValidationResultForm dlg = new ValidationResultForm();
            dlg.Init(verifier);
            dlg.ShowDialog();
        }
    }
}