#!/usr/bin/env python

import json
import sys
from argparse import ArgumentParser
from os.path import expanduser, isfile, isdir


def args_cmd():
    """Parse the command line arguments via argparse"""
    parser = ArgumentParser(description='Convert tool from txt to json format')
    parser.add_argument(
        '--input', '-i', default=expanduser('~/.workstamps.txt'),
        help='Input filename (default ~/.workstamps.txt')
    parser.add_argument(
        '--output', '-o', default=expanduser('~/.workstamps.json'),
        help='Input filename (default: ~/.workstamps.json)')
    return parser.parse_args()


def itemify(line):
    """Split a line, returning date and the rest of data"""
    line = line.strip()
    end_time = line[:16]
    info = line[17:]
    return(line[:16], line[17:])


if __name__ == '__main__':
    args = args_cmd()

    stamps = []

    with open(args.input, 'r') as infile:

        for line in infile:
            time, info = itemify(line)

            if info == 'start':
                customer = None
                action = None
                start_time = time
                end_time = None

            elif time == 'restarttotals':
                continue

            else:
                info_items = info.split(' ', 1)
                customer = info_items[0]
                action = ''
                if len(info_items) > 1:
                    action = info_items[1].lstrip('- ')
                # if the previous line was not a start line, took the previous
                # line end time as start time
                if end_time is not None:
                    start_time = end_time
                end_time = time

            stamps.append({
                'start': start_time,
                'end': end_time,
                'customer': customer,
                'action': action,
            })

    if isfile(args.output):
        print('[warning] %(out)s already exist'
              % {'out': args.output})
        confirm = raw_input('overwrite? (y/n) ')
        while confirm not in ['y','n','Y','N']:
            confirm = raw_input('overwrite? (y/n) ')
        if confirm in ['n', 'N']:
            print('[warning] exiting without converting')
            sys.exit()

    elif isdir(args.output):
        print('[error] %(out)s is a directory, remove it first'
              % {'out': args.output})
        sys.exit(1)

    with open(args.output, 'w') as stamps_file:
        json.dump(stamps, stamps_file, indent=4)