#!/usr/bin/env python
# coding=utf-8
from __future__ import print_function

import argparse
import os

# List of files which must be loaded first
PRELOAD = (
    'random/random.js',
    'random/mersennetwister.js',
    'utils/init.js',
    'utils/platform.js',
    'logging/console.js',
    'make/init.js'
)


def argparser():
    parser = argparse.ArgumentParser()
    parser.add_argument('-l', '--libs', required=True,
                        help='Directory containing the octo libraries.')
    parser.add_argument('-d', '--deploy', required=True,
                        help='Directory where the combined octo library will be built.')
    args = parser.parse_args()

    if not os.path.isdir(args.libs):
        parser.error("Lib directory doesn't exist!")
    if not os.path.isdir(args.deploy):
        parser.error("Deploy directory doesn't exist!")

    return args


def main():
    args = argparser()

    data = []
    loaded = set()

    for filename in PRELOAD:
        path = os.path.join(args.libs, filename)
        if not os.path.isfile(path):
            raise Exception("Unable to find file in preload: {0}".format(path))
        print("Adding path: {0}".format(path))
        with open(path, 'rb') as f:
            data.append(f.read())
            loaded.add(path)

    for root, _, files in os.walk(args.libs):
        for filename in files:
            path = os.path.join(root, filename)
            if path.endswith('.js') and path not in loaded:
                print("Adding path: {0}".format(path))
                with open(path, 'rb') as f:
                    data.append(f.read())

    octo_path = os.path.join(args.deploy, 'octo.js')
    with open(octo_path, 'wb') as f:
        f.write(b'\n\n'.join(data))


if __name__ == "__main__":
    main()