using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace RushMidiLibrary {
    public static class MidiApiWindows {
        [DllImport("winmm.dll")]
        public static extern uint midiOutGetNumDevs();
        [DllImport("winmm.dll")]
        public static extern uint midiInGetNumDevs();

        public enum MMRESULT : uint {
            MMSYSERR_BASE = 0,
            MMSYSERR_NOERROR = MMSYSERR_BASE + 0,
            MMSYSERR_ERROR = MMSYSERR_BASE + 1,
            MMSYSERR_BADDEVICEID = MMSYSERR_BASE + 2,
            MMSYSERR_NOTENABLED = MMSYSERR_BASE + 3,
            MMSYSERR_ALLOCATED = MMSYSERR_BASE + 4,
            MMSYSERR_INVALHANDLE = MMSYSERR_BASE + 5,
            MMSYSERR_NODRIVER = MMSYSERR_BASE + 6,
            MMSYSERR_NOMEM = MMSYSERR_BASE + 7,
            MMSYSERR_NOTSUPPORTED = MMSYSERR_BASE + 8,
            MMSYSERR_BADERRNUM = MMSYSERR_BASE + 9,
            MMSYSERR_INVALFLAG = MMSYSERR_BASE + 10,
            MMSYSERR_INVALPARAM = MMSYSERR_BASE + 11,
            MMSYSERR_HANDLEBUSY = MMSYSERR_BASE + 12,
            MMSYSERR_INVALIDALIAS = MMSYSERR_BASE + 13,
            MMSYSERR_BADDB = MMSYSERR_BASE + 14,
            MMSYSERR_KEYNOTFOUND = MMSYSERR_BASE + 15,
            MMSYSERR_READERROR = MMSYSERR_BASE + 16,
            MMSYSERR_WRITEERROR = MMSYSERR_BASE + 17,
            MMSYSERR_DELETEERROR = MMSYSERR_BASE + 18,
            MMSYSERR_VALNOTFOUND = MMSYSERR_BASE + 19,
            MMSYSERR_NODRIVERCB = MMSYSERR_BASE + 20,
            MMSYSERR_MOREDATA = MMSYSERR_BASE + 21,
            MMSYSERR_LASTERROR = MMSYSERR_BASE + 21,


            MIDIERR_BASE = 64,
            MIDIERR_UNPREPARED = MIDIERR_BASE + 0,
            MIDIERR_STILLPLAYING = MIDIERR_BASE + 1,
            MIDIERR_NOMAP = MIDIERR_BASE + 2,
            MIDIERR_NOTREADY = MIDIERR_BASE + 3,
            MIDIERR_NODEVICE = MIDIERR_BASE + 4,
            MIDIERR_INVALIDSETUP = MIDIERR_BASE + 5,
            MIDIERR_BADOPENMODE = MIDIERR_BASE + 6,
            MIDIERR_DONT_CONTINUE = MIDIERR_BASE + 7,
            MIDIERR_LASTERROR = MIDIERR_BASE + 7
        }


        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInGetErrorText(MMRESULT errCode, StringBuilder message, uint sizeOfMessage);

        public static MMRESULT midiInGetErrorText(MMRESULT mmrError, StringBuilder lpText) {
            return midiInGetErrorText(mmrError, lpText, (UInt32)lpText.Capacity);
        }



        [DllImport("winmm.dll")]
        private static extern MMRESULT midiInGetDevCaps(UIntPtr uDeviceID, out MIDIINCAPS caps, uint sizeOfMidiInCaps);
        public static MMRESULT midiInGetDevCaps(UIntPtr uDeviceID, out MIDIINCAPS caps) {
            return midiInGetDevCaps(uDeviceID, out caps, (uint)Marshal.SizeOf<MIDIINCAPS>());
        }


        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInOpen(out HMIDIIN phmi, UIntPtr uDeviceID, MidiInProc dwCallback, UIntPtr dwInstance, MidiOpenFlags fdwOpen);

        public static MMRESULT midiInOpen(out HMIDIIN phmi, UIntPtr uDeviceID, MidiInProc dwCallback, UIntPtr dwInstance) {
            return midiInOpen(out phmi, uDeviceID, dwCallback, dwInstance, dwCallback == null ? MidiOpenFlags.CALLBACK_NULL : MidiOpenFlags.CALLBACK_FUNCTION);
        }


        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInClose(HMIDIIN hmi);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInStart(HMIDIIN hmi);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInStop(HMIDIIN hmi);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInReset(HMIDIIN hmi);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInAddBuffer(HMIDIIN hmi, ref MIDIHDR lpMidiHeader, uint wSize);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInPrepareHeader(HMIDIIN handle, ref MIDIHDR lpMidiHeader, uint wSize);
        [DllImport("winmm.dll")]
        public static extern MMRESULT midiInUnprepareHeader(HMIDIIN handle, ref MIDIHDR lpMidiHeader, uint wSize);


        [DllImport("Kernel32.dll", CallingConvention = CallingConvention.Winapi)]
        public static extern void GetSystemTimePreciseAsFileTime(out long filetime);


        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
        public delegate void MidiInProc(HMIDIIN handle, MidiInMessage wMsg, UIntPtr dwInstance, UIntPtr dwParam1, UIntPtr dwParam2);


        public struct HMIDIIN {
            public IntPtr handle;
        }

        public struct HMIDIOUT {
            public IntPtr handle;
        }

        public enum MidiInMessage : uint {
            MIM_OPEN = 0x3C1,
            MIM_CLOSE = 0x3C2,
            MIM_DATA = 0x3C3,
            MIM_LONGDATA = 0x3C4,
            MIM_ERROR = 0x3C5,
            MIM_LONGERROR = 0x3C6,
            MIM_MOREDATA = 0x3CC
        }

        public enum MidiOpenFlags : uint {
            CALLBACK_TYPEMASK = 0x70000,
            CALLBACK_NULL     = 0x00000,
            CALLBACK_WINDOW   = 0x10000,
            CALLBACK_TASK     = 0x20000,
            CALLBACK_FUNCTION = 0x30000,
            CALLBACK_THREAD   = CALLBACK_TASK,
            CALLBACK_EVENT    = 0x50000,
            MIDI_IO_STATUS    = 0x00020
        }


        [StructLayout(LayoutKind.Sequential)]
        public struct MIDIINCAPS {
            public ushort wMid;
            public ushort wPid;
            public uint vDriverVersion;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string szPname;
            public uint dwSupport;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MIDIHDR {
            public UIntPtr lpData;
            public uint dwBufferLength;
            public uint dwBytesRecorded;
            public UIntPtr dwUser;
            public uint dwFlags;
            public UIntPtr lpNext;
            public UIntPtr reserved;
            public uint dwOffset;
            public UIntPtr dwReserved0;
            public UIntPtr dwReserved1;
            public UIntPtr dwReserved2;
            public UIntPtr dwReserved3;
            public UIntPtr dwReserved4;
            public UIntPtr dwReserved5;
            public UIntPtr dwReserved6;
            public UIntPtr dwReserved7;
        }
    }
}