using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Contains methods to handle files
/// </summary>
public class FileHandler
{
	public FileHandler()
	{
		//
		// TODO: Add constructor logic here
		//
	}

    public static bool CheckUploadedFileExists(string uploadFolderPath, string subDirName, string fileName)
    {

        string fullFilePath = "";

        if (subDirName.Length > 0)
        {
            uploadFolderPath = uploadFolderPath + "\\" + subDirName;
        }

        fullFilePath = string.Format(@"{0}\{1}", uploadFolderPath, fileName);

        if (System.IO.File.Exists(fullFilePath) == true)
        {
            return true;
        }
        else
        {
            return false;
        }

    }

    public static string UploadFile(FileUpload objectFileUpload, bool keepFileName,
        string subDirName, string addToFileName2, string addToFileName3,
        string uploadFolderPath, string rootUploadFolder, string allowedExtensions)
    {
        string userFileName = "";
        string modifiedFileName = "";
        string fileExtension = "";
        string newFileName = "";
        string newFileNamePath = "";
        bool uploadAllowed = false;
        string returnMsg = "";

        userFileName = objectFileUpload.PostedFile.FileName;
        userFileName = userFileName.Substring(userFileName.LastIndexOfAny(new char[] { Char.Parse(@"\"), Char.Parse(@"/") }) + 1);
        string userFileNameLowerCase = userFileName.ToLower();

        if (userFileName != "")
        {
            fileExtension = userFileNameLowerCase.Substring(userFileNameLowerCase.LastIndexOfAny(new char[] { Char.Parse(@".") }));

            // allowedExtensions is a comma-delimited string of allowed extensions
            // in the form ".xls,.doc,.gif,.jpg,.jpeg"
            allowedExtensions = Utilities.removeSpaces(allowedExtensions);

            // Check to see if the extension is permitted
            if (allowedExtensions.Length > 0)
            {
                int i;
                string[] extensionsAllowed = allowedExtensions.Split(',');

                for (i = 0; i < extensionsAllowed.Length; i++)
                {
                    if (fileExtension == extensionsAllowed[i].ToLower())
                    {
                        uploadAllowed = true;
                    }
                    else
                    {
                        // Format comma-delimited string so it's legible
                        allowedExtensions = Utilities.putSpaceAfterChar(allowedExtensions, ",");
                        returnMsg = "Can't upload " + userFileName + ", only " + allowedExtensions + " files allowed.";
                    }
                }
            }
        }
        else
        {
            returnMsg = "File for upload not specified";
        }

        if (uploadAllowed)
        {
            int fileSize = objectFileUpload.PostedFile.ContentLength;

            returnMsg = "";

            if (fileSize > 0)
            {
                try
                {
                    uploadFolderPath = uploadFolderPath + "\\" + subDirName;

                    // Create the dir structure if it doesn't exist
                    if (!System.IO.Directory.Exists(uploadFolderPath))
                    {
                        System.IO.Directory.CreateDirectory(uploadFolderPath);
                    }
                    System.IO.Directory.SetCurrentDirectory(uploadFolderPath);

                    modifiedFileName = "_" + userFileNameLowerCase;

                    if (!keepFileName)
                    {
                        // We are just keeping the extention
                        modifiedFileName = fileExtension;
                    }

                    // Rename the file for standardization
                    newFileName = string.Format(@"{0}{1}{2}", addToFileName2 + "_", addToFileName3, modifiedFileName);
                    newFileNamePath = string.Format(@"{0}\{1}", uploadFolderPath, newFileName);

                    // If the file already exists, delete it
                    if (System.IO.File.Exists(newFileNamePath) == true)
                    {
                        System.IO.File.Delete(newFileNamePath);
                    }

                    // Save the new file
                    objectFileUpload.PostedFile.SaveAs(newFileNamePath);

                    returnMsg = rootUploadFolder + "/" + subDirName + "/" + newFileName;
                }
                catch (Exception ex)
                {
                    returnMsg = ex.ToString();
                }
            }
            else
            {
                returnMsg = "'" + userFileName + "' contains no data, file NOT uploaded.";
            }
        }
        return returnMsg;
    }
}