#!/usr/bin/env python3

import assetmgr
import json
import os

def main():
    fd = open('src/assets/%s/sequences.json' % os.environ['ROMID'], 'r')
    data = fd.read()
    fd.close()

    rows = json.loads(data)

    make_object(rows)
    make_header(rows)

def make_header(rows):
    typename = 'music'
    enums = [row['id'] for row in rows]
    filename = 'sequences.h'
    terminator = 'MUSIC_END'
    assetmgr.write_enums(typename, enums, filename, terminator)

def make_object(rows):
    binary = len(rows).to_bytes(2, 'big') + b'\x00\x00'
    datasection = bytes()
    pos = 4 + len(rows) * 8

    for row in rows:
        contents = getcontents('src/assets/%s/sequences/%s' % (os.environ['ROMID'], row['file']))
        zipped = assetmgr.zip(contents)

        if len(zipped) % 2:
            zipped += b'\x0a'

        binary += pos.to_bytes(4, 'big')
        binary += len(contents).to_bytes(2, 'big')
        binary += len(zipped).to_bytes(2, 'big')

        datasection += zipped
        pos += len(zipped)

    binary += datasection

    assetmgr.write_object(binary, 'sequences.o')

def getcontents(filename):
    with open(filename, 'rb') as fd:
        return fd.read()

main()