from struct import unpack_from, calcsize

FMT = dict(
    char='c',
    int8='b',
    uint8='B',
    int16='h',
    uint16='H',
    int32='i',
    uint32='I',
    int64='q',
    uint64='Q',
    float='f',
    double='d'
)


def parse(buf, offs, ty, order='>'):
    pattern = FMT[ty]
    size = calcsize(pattern)
    value = unpack_from(order + pattern, buf, offs)[0]
    return value, offs + size


def parse_d(buf, offs):
    d1, offs = parse(buf, offs, "int64")

    d2_size, offs = parse(buf, offs, 'uint32')
    d2_offset, offs = parse(buf, offs, 'uint16')
    d2 = []

    for _ in range(d2_size):
        val, d2_offset = parse(buf, d2_offset, "uint32")
        d2.append(val)

    d3, offs = parse(buf, offs, "uint8")
    d4, offs = parse(buf, offs, "int8")

    d5_size, offs = parse(buf, offs, 'uint32')
    d5_offset, offs = parse(buf, offs, 'uint32')
    d5 = []

    for _ in range(d5_size):
        val, d5_offset = parse(buf, d5_offset, "int64")
        d5.append(val)

    return dict(D1=d1, D2=d2, D3=d3, D4=d4, D5=d5), offs


def parse_c(buf, offs):
    c1, offs = parse(buf, offs, 'float')
    c2, offs = parse(buf, offs, 'float')
    return dict(C1=c1, C2=c2), offs


def parse_b(buf, offs):
    b1_size, offs = parse(buf, offs, 'uint32')
    b1_offset, offs = parse(buf, offs, 'uint16')
    b1 = []
    for _ in range(b1_size):
        val, b1_offset = parse_c(buf, b1_offset)
        b1.append(val)

    b2 = []
    for _ in range(5):
        val, offs = parse(buf, offs, "uint16")
        b2.append(val)

    b3, offs = parse(buf, offs, "uint32")
    b4, offs = parse(buf, offs, "uint64")
    b5, offs = parse(buf, offs, "uint16")

    b6, _ = parse_d(buf, offs)

    return dict(B1=b1, B2=b2, B3=b3, B4=b4, B5=b5, B6=b6, ), offs


def parse_a(buf, offs):
    a1, offs = parse(buf, offs, 'uint64')
    a2, offs = parse(buf, offs, 'double')
    a3, offs = parse(buf, offs, 'uint8')
    a4, offs = parse(buf, offs, 'uint8')
    a5, offs = parse(buf, offs, 'int32')

    a6_offset, offs = parse(buf, offs, 'uint32')
    a6, _ = parse_b(buf, a6_offset)
    return dict(A1=a1, A2=a2, A3=a3, A4=a4, A5=a5, A6=a6), offs


def main(stream):
    return parse_a(stream, 5)[0]