using System.IO;
using System.Text;

namespace Chernobyl.TextWriters
{
    /// <summary>
    /// This class is used to write text to
    /// a file dynamically. More specifically, 
    /// it was created to redirect console output 
    /// to a file and ensure that the file was 
    /// kept up-to-date. This prevents errors from 
    /// interfering with the results of the output.
    /// </summary>
    public class DynamicFileTextWriter : TextWriter
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="fileStream">The FileStream to write
        /// the output to.</param>
        public DynamicFileTextWriter(FileStream fileStream)
        {
            File = fileStream;
        }

        /// <summary>
        /// Writes a line of text out which is 
        /// ended with a newline.
        /// </summary>
        /// <param name="value">The string to write to the file.</param>
        public override void WriteLine(string value)
        {
            // append a newline, write to the file, and force
            // the file write.
            value += System.Environment.NewLine;
            Write(value);
        }

        /// <summary>
        /// Writes the string to the file.
        /// </summary>
        /// <param name="value">The string to write to the file.</param>
        public override void Write(string value)
        {
            File.Write(System.Text.ASCIIEncoding.ASCII.GetBytes(value), 0, value.Length);
            File.Flush();
        }


        /// <summary>
        /// When overridden in a derived class, returns the 
        /// <see cref="T:System.Text.Encoding"/> in which the output is written.
        /// </summary>
        /// <value>The encoding in which the output is written.</value>
        /// <returns>The Encoding in which the output is written.</returns>
        public override Encoding Encoding
        {
            get { return Encoding.ASCII; }
        }

        /// <summary>
        /// The file to write the output to.
        /// </summary>
        FileStream File {get; set;}
    }
}