import lvgl as lv


def esp32fs_open_cb( fs_file, path, mode):

    print("Info: opening file '{}'".format(path))

    p_mode = 'rb' if mode & 0x2 else ''
    p_mode = 'wb' if mode & 0x1 else ''
    p_mode = 'rb+' if mode & 0x3 else ''

    if p_mode == '':
        print("Warn: open mode error: {}".format(mode))
        return 11

    with open(path, p_mode) as f:
        fs_file.file_d = { 'file': f }
        print("Info: File {} opened".format(path))
        return 0

    print("Warn: Opening file {} failed".format(path)) 
    return 4


def esp32fs_close_cb( fs_file):

    print("Info: called close()")
    d = fs_file.file_d.cast()

    try:
        d['file'].close()
    except:
        print("Warn: exception while closing file")
        return 12

    print("Info: File descriptor closed")
    return 0


def esp32fs_read_cb( fs_file, buf, btr, br):
    print("Info: called read()")
    d = fs_file.file_d.cast()

    try:
        buf = d['file'].read(btr)
    except:
        print("Warn: read exception")
        return 3

    br = len(buf)

    print("Info: read {}B".format(br))
    return 0


def esp32fs_seek_cb( fs_file, pos):
    print("Info: called seek()")
    d = fs_file.file_d.cast()

    try:
        d['file'].seek( pos, 0)
    except:
        print("Warn: seek exception")
        return 3

    print("Info: seek to position {}".format(pos))
    return 0


def esp32fs_tell_cb( fs_file, pos):
    print("Info: called tell()")
    d = fs_file.file_d.cast()

    try:
        pos = d['file'].tell()
    except:
        print("Warn: tell exception")
        return 3

    print("Info: position is {}".format(pos))
    return 0


def esp32fs_write_cb( fs_file, buf, btw, bw):
    print("Info: called write()")
    d = fs_file.file_d.cast()

    try:
        d['file'].write(buf)
    except:
        print("Warn: write exception")
        return 3

    bw = btw

    print("Info: write {}B".format(bw))
    return 0