#!/usr/bin/env python

from git import Repo
import os
import sys
import yaml

# constants
CONFIG_FILE = 'sfm.yaml'

# reads configuration and returns the dictionary
def read_config():
    f = open(CONFIG_FILE, 'r')
    conf = yaml.load(f)
    f.close()

    return conf

# makes the formulas directory if it doesn't exist
def check_formula_dir(conf):
    # check if the formulas directory is actually a directory
    if not os.path.isdir(conf['formulas_dir']):
        # check if it's a file
        if os.path.exists(conf['formulas_dir']):
            print(str(conf['formulas_dir']) + ' exists but is not a directory. Please fix this.')
            sys.exit(1)
        # create it if not
        else:
            os.makedirs(conf['formulas_dir'])

# loops through the array of repos and downloads them
def get_formulas(conf):
    for formula in conf['formulas']:
        if isinstance(formula, dict):
            print('Downloading ' + str(formula['url']) + ' into ' + str(conf['formulas_dir']) + '/' + str(formula['name']))
        elif isinstance(formula, str):
            print('Downloading ' + str(conf['formulas_url']) + str(formula) + '-formula into ' + str(conf['formulas_dir']) + '/' + str(formula) + '-formula')

# main program
def main():
    # read configuration settings
    conf = read_config()

    # make sure the formulas directory exists
    check_formula_dir(conf)

    # do the formula stuff
    get_formulas(conf)

# run main
main()