using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace GeneralLib
{
    public partial class FrmPLSound : Form
    {
        public FrmPLSound()
        {
            InitializeComponent();
        }

        private const int MM_MCINOTIFY = 0x3B9;

        [DllImport("winmm.dll")]
        private static extern Int32 mciSendString(String command,
            StringBuilder buffer, Int32 bufferSize, IntPtr hwndCallback);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        private static extern int GetShortPathName(string lpszLongPath,
             string shortFile,
             int cchBuffer);

        private void FrmPLSound_Load(object sender, EventArgs e)
        {

        }

        private bool IsLoop = false;
        private string PlayKey = "";
        private string PlayPath = "";

        protected override void DefWndProc(ref Message m)
        {
            base.DefWndProc(ref m);

            if (m.Msg == MM_MCINOTIFY)
            {
                if (m.WParam == (IntPtr)1)
                {
                    if (IsLoop)
                    {
                        Play(PlayKey, PlayPath, true);
                    }
                    else
                    {
                        StopKey(PlayKey);
                        //this.Close();
                    }
                }
            }
        }

        private string GetShortPath(string longPath)
        {
            string shortPath = "";
            try
            {
                shortPath = "".PadLeft(520, Convert.ToChar(" "));
                GetShortPathName(longPath, shortPath, shortPath.Length);
                int endChr = shortPath.LastIndexOf("\0");
                if (endChr >= 0)
                    shortPath = shortPath.Substring(0, endChr);
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex);
            }

            return shortPath;
        }

        public void Play(string key, string path, bool isLoop)
        {
            try
            {
                path = GetShortPath(path);

                StopKey(key);

                IsLoop = isLoop;
                PlayKey = key;
                PlayPath = path;
                
                mciSendString("open \"" + path + "\" alias " + key, null, 0, IntPtr.Zero);
                mciSendString("play " + key + " notify", null, 0, this.Handle);
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex);
            }
        }

        private void StopKey(string key)
        {
            mciSendString("stop " + key, null, 0, IntPtr.Zero);
            mciSendString("close " + key, null, 0, IntPtr.Zero);
        }

        public void Stop(string key)
        {
            IsLoop = false;
            StopKey(key);
            //this.Close();
        }

        private void FrmPLSound_FormClosing(object sender, FormClosingEventArgs e)
        {
            IsLoop = false;
            StopKey(PlayKey);
        }
    }
}