using UnityEngine;
#if UNITY_STANDALONE_WIN
using System.Runtime.InteropServices;
#endif 
using System;

namespace GeneralTools
{
    public class SoundManager : SingletonBaseAttribute<SoundManager>
    {
#if UNITY_STANDALONE_WIN
        public override void IStart()
        {
            base.IStart();
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.PageUp, () => { SystemVolumeUp(); }, "增加系统音量", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.PageDown, () => { SystemVolumeDown(); }, "降低系统音量", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.Pause, () => { SystemMute(); }, "静音/恢复系统音量", false, 0);
        }
        #region System
        [DllImport("user32.dll")]
        static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

        [DllImport("user32.dll")]
        static extern byte MapVirtualKey(uint uCode, uint uMapType);

        private const byte VK_VOLUME_MUTE = 0xAD;
        private const byte VK_VOLUME_DOWN = 0xAE;
        private const byte VK_VOLUME_UP = 0xAF;
        private const uint KEYEVENTF_EXTENDEDKEY = 0x0001;
        private const uint KEYEVENTF_KEYUP = 0x0002;

        /// <summary>
        /// 改变系统音量大小，增加
        /// </summary>
        public void SystemVolumeUp()
        {
            keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY, 0);
            keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
        }

        /// <summary>
        /// 改变系统音量大小，减小
        /// </summary>
        public void SystemVolumeDown()
        {
            keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY, 0);
            keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
        }

        /// <summary>
        /// 改变系统音量大小，静音
        /// </summary>
        public void SystemMute()
        {
            keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY, 0);
            keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
        }
        #endregion
#endif
    }
}