module aimpremote;

import core.sys.windows.windows;

private const wstring AIMPRemoteAccessClass = "AIMP2_RemoteInfo";
private const int AIMPRemoteAccessMapFileSize = 2048;

align(1)
private struct AIMPRemoteFileInfo
{
    DWORD deprecated1;
    BOOL active;
    DWORD bitRate;
    DWORD channels;
    DWORD duration;
    align(4) INT64 fileSize;
    DWORD fileMark;
    DWORD sampleRate;
    DWORD trackNumber;
    DWORD albumLength;
    DWORD artistLength;
    DWORD dateLength;
    DWORD fileNameLength;
    DWORD genreLength;
    DWORD titleLength;
    DWORD[6] deprecated2;
};

private enum TagItem {
    Album, Artist, Date, FileName, Genre, Title
}

public struct TrackInfo {
    wstring artist;
    wstring title;
    wstring genre;
};

public static TrackInfo getInfo() {
    import std.conv : to;
    import std.traits : EnumMembers;

    auto haimp = OpenFileMapping(FILE_MAP_READ, 0, AIMPRemoteAccessClass.ptr);
    const auto hfilemap = MapViewOfFile(haimp, FILE_MAP_READ, 0, 0, AIMPRemoteAccessMapFileSize);

    AIMPRemoteFileInfo* info = cast(AIMPRemoteFileInfo*) hfilemap;
    auto bytes = (cast(ubyte*) hfilemap)[0 .. AIMPRemoteAccessMapFileSize];

    const wcharsize = wchar.sizeof;
    auto pbuff = AIMPRemoteFileInfo.sizeof;

    DWORD[TagItem] lengthInfo;
    wstring[TagItem] trackInfo;

    lengthInfo[TagItem.Album] = info.albumLength;
    lengthInfo[TagItem.Artist] = info.artistLength;
    lengthInfo[TagItem.Date] = info.dateLength;
    lengthInfo[TagItem.FileName] = info.fileNameLength;
    lengthInfo[TagItem.Genre] = info.genreLength;
    lengthInfo[TagItem.Title] = info.titleLength;
    foreach (index, immutable item; [EnumMembers!TagItem]) {
        auto key = to!TagItem(index);
        auto length = lengthInfo[key];
        trackInfo[key] = cast(wstring)(bytes[pbuff .. (pbuff + length * wcharsize)]);
        pbuff += length * wcharsize;
    }

    TrackInfo result = {
        artist: trackInfo[TagItem.Artist],
        title: trackInfo[TagItem.Title],
        genre: trackInfo[TagItem.Genre]
    };
    return result;
}

private static HWND findPlayerWindow() {
    return FindWindow(AIMPRemoteAccessClass.ptr, null);
}

/*void main() {
    import std.stdio : writeln, write;

    auto haimp = OpenFileMapping(FILE_MAP_READ, 0, AIMPRemoteAccessClass.ptr);
    auto hfilemap = MapViewOfFile(haimp, FILE_MAP_READ, 0, 0, AIMPRemoteAccessMapFileSize);

    AIMPRemoteFileInfo* info = cast(AIMPRemoteFileInfo*) hfilemap;
    write("Bitrate: ");
    writeln(info.bitRate);
    write("Samplerate: ");
    writeln(info.sampleRate);
    write("fileSize: ");
    writeln(info.fileSize);

    auto bytes = (cast(ubyte*) hfilemap)[0 .. AIMPRemoteAccessMapFileSize];
    writeln(bytes);


    const wcharsize = wchar.sizeof;
    auto pbuff = AIMPRemoteFileInfo.sizeof;

    DWORD[TagItem] lengthInfo;
    wstring[TagItem] trackInfo;

    lengthInfo[TagItem.Album] = info.albumLength;
    lengthInfo[TagItem.Artist] = info.artistLength;
    lengthInfo[TagItem.Date] = info.dateLength;
    lengthInfo[TagItem.FileName] = info.fileNameLength;
    lengthInfo[TagItem.Genre] = info.genreLength;
    lengthInfo[TagItem.Title] = info.titleLength;
    foreach (key; TagItem.min .. TagItem.max) {
        auto length = lengthInfo[key];
        trackInfo[key] = cast(wstring)(bytes[pbuff .. (pbuff + length * wcharsize)]);
        pbuff += length * wcharsize;
    }

    foreach (key, value; trackInfo) {
        writeln(value);
    }
}*/