#!/usr/bin/env python

from __future__ import print_function
import argparse
import os
import sys
import yaml


def convert_yaml_to_rosinstall(yaml_file, rosinstall_file):
    data = yaml.safe_load(open(yaml_file, 'r'))
    data = convert_yaml_data_to_rosinstall_data(data)
    with open(rosinstall_file, 'w') as out_file:
        yaml.dump(data, out_file, default_flow_style=False)


def convert_yaml_data_to_rosinstall_data(data):
    rosinstall_data = []
    for name in sorted(data['repositories'].keys()):
        values = data['repositories'][name]
        repo = {}
        repo['local-name'] = name
        repo['uri'] = values['url']
        if 'version' in values:
            repo['version'] = values['version']
        # fallback type is git for gbp repositories
        vcs_type = values['type'] if 'type' in values else 'git'
        rosinstall_data.append({vcs_type: repo})
    return rosinstall_data


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Convert a .yaml file into a .rosinstall file.')
    parser.add_argument('yaml_file', help='The .yaml file to convert')
    parser.add_argument('rosinstall_file', nargs='?', help='The generated .rosinstall file (default: same name as .yaml file except extension)')
    args = parser.parse_args()

    if args.rosinstall_file is None:
        path_without_ext, _ = os.path.splitext(args.yaml_file)
        args.rosinstall_file = path_without_ext + '.rosinstall'

    try:
        convert_yaml_to_rosinstall(args.yaml_file, args.rosinstall_file)
    except Exception as e:
        print(str(e), file=sys.stderr)
        exit(1)