/*
 * Audio - Audio allows sound to be played during a animation.
 * 
 * Author: Phillip Piper
 * Date: 18/01/2010 5:29 PM
 *
 * Change log:
 * 2010-01-18   JPP  - Initial version
 *
 * To do:
 *
 * Copyright (C) 2010 Phillip Piper
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * If you wish to use this code in a closed source application, please contact phillip_piper@bigfoot.com.
 */

using System;
using System.Collections.Generic;
using System.Media;
using System.IO;
using System.Reflection;
using System.Threading;

namespace BrightIdeasSoftware
{
    /// <summary>
    /// Instances of this class allow sound to be played at specified
    /// points within a animation.
    /// </summary>
    /// <remarks>
    /// <para>
    /// This class uses the SoundPlayer class internally, and thus can
    /// only handle system sounds and WAV sound files.
    /// </para>
    /// <para>A sound that is already playing cannot be paused.</para>
    /// </remarks>
    public class Audio : Animateable
    {
        #region Life and death

        /// <summary>
        /// Load a sound from a named resource.
        /// </summary>
        /// <param name="resourceName">The name of the resource including the trailing ".wav"</param>
        /// <remarks>To embed a wav file, simple add it to the project, and change "Build Action"
        /// to "Embedded Resource".</remarks>
        /// <see cref="http://msdn.microsoft.com/en-us/library/ms950960.aspx"/>
        public static Audio FromResource(string resourceName) {
            Audio sound = new Audio();
            sound.ResourceName = resourceName;
            return sound;
        }

        /// <summary>
        /// Create an empty Audio object
        /// </summary>
        public Audio() {
        }

        /// <summary>
        /// Creates an Audio object that will play the given "wav" file
        /// </summary>
        /// <param name="fileName"></param>
        public Audio(string fileName) {
            this.FileName = fileName;
        }

        /// <summary>
        /// Creates an Audio object that will play the given system sound
        /// </summary>
        /// <param name="sound"></param>
        public Audio(SystemSound sound) {
            this.SystemSound = sound;
        }

        #endregion

        #region Implementation properties

        /// <summary>
        /// Gets or sets the name of the audio file that will be played.
        /// </summary>
        protected string FileName ;
        protected SoundPlayer Player ;
        protected string ResourceName ;
        protected SystemSound SystemSound ;

        #endregion

        #region Animation methods

        /// <summary>
        /// Start the sound playing
        /// </summary>
        public override void Start() {
            // If we are supposed to play an application resource, try to load it
            if (!String.IsNullOrEmpty(this.ResourceName)) {
                Assembly executingAssembly = Assembly.GetExecutingAssembly();
                string assemblyName = executingAssembly.GetName().Name;
                Stream stream = executingAssembly.GetManifestResourceStream(assemblyName + "." + this.ResourceName);
                if (stream != null) 
                    this.Player = new SoundPlayer(stream);
            }

            if (!String.IsNullOrEmpty(this.FileName)) {
                this.Player = new SoundPlayer(this.FileName);
            }

            // We could just use Play() and let the player handle the threading for us, but:
            // - there is no builtin way to know when the sound has finished
            // - on XP (at least), using Play() on a Stream gives noise -- but PlaySync() works fine.

            this.done = false;
            Thread newThread = new Thread((ThreadStart)delegate {
                if (this.SystemSound != null)
                    this.SystemSound.Play();
                else {
                    if (this.Player != null)
                        this.Player.PlaySync();
                }
                this.done = true;
            });
            newThread.Start();
        }
        bool done;

        /// <summary>
        /// Advance the audio and return if it is done.
        /// </summary>
        /// <param name="elapsed"></param>
        /// <returns></returns>
        public override bool Tick(long elapsed) {
            return !this.done;
        }

        /// <summary>
        /// Stop the sound
        /// </summary>
        public override void Stop() {
            if (this.SystemSound != null) 
                return;

            if (this.Player != null) {
                this.Player.Stop();
                this.Player.Dispose();
                this.Player = null;
            }
        }

        #endregion
    }
}