#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
import argparse
import re

# parse arguments and return arguments list.
def get_args():
    parser = argparse.ArgumentParser(
    formatter_class=argparse.RawDescriptionHelpFormatter,
    description="""\
Create Context for CbC code. Default output is stdout.
    """)
    parser.add_argument('input_file',\
                        nargs=None,\
                        type=str,\
                        help='input file path.')
    parser.add_argument('-o', dest='output',\
                        nargs=1,\
                        type=str,\
                        metavar='<file>',\
                        help='write output to <file>')
                        
    return parser.parse_args()

# parse input file and create meta connection list
def create_context(lines, file):
    code_list = []
    for l in lines:
        # get code segment name except for stub and meta
        if re.search(r"^ *__code",l) is not None:
            regexed_l = re.search(r"[a-zA-Z0-9_]+ *\(",l)
            cs_name = regexed_l.group(0).rstrip('(')
            if re.search(r"^ *meta_*|stub$",cs_name) is None:
                code_list.append(cs_name.capitalize())
        

    write_context(code_list, file)
    

def write_context(code_list, file):
    file.write('/*-- created by script --*/\n')
    file.write('enum Code {\n')
    for c in code_list:
        file.write('    {0:s},\n'.format(c))
    file.write('    Exit,\n')
    file.write('};\n')


def main():
    args = get_args()
    output = sys.stdout
    try:
        f = open(args.input_file,'r')
    except IOError:
        print("cannot open file %s" % input_file)
    if args.output is not None:
        try:
            output = open(args.output[0],'w')
        except IOError:
            print("cannot open file %s" % args.output)
        
    lines = f.readlines()
    connect_list = create_context(lines, output)
    
main()