#! /usr/bin/env python3

import re
import sys

import yaml


RENAME_REGEX = re.compile(r'\.(markdown|md)')
FRONT_MATTER_REGEX = re.compile(r'^---\n([\s\S]+?)\n---', re.MULTILINE)

def convert(filename):
    org_filename = re.sub(RENAME_REGEX, '.org', filename)

    with open(filename) as md_file:
        markdown = md_file.read()

    filename = re.sub(RENAME_REGEX, '', filename)

    # Get the front matter
    m = re.match(FRONT_MATTER_REGEX, markdown)
    if not m:
        print(f'No front matter found in {filename}')

        return

    front_matter = m.groups()[0]
    markdown = markdown[len(front_matter) + 10:]
    front_matter = yaml.load(front_matter)

    markdown = '\n'.join('  ' + line if line else '' for line in markdown.split('\n'))

    tags = ''
    permalink = ''
    date = front_matter['date'].isoformat().replace('T', ' ')

    if 'tags' in front_matter:
        tags = '  :' + ':'.join(front_matter['tags']) + ':'

    if 'permalink' in front_matter:
        permalink = f'  :PERMALINK: {front_matter["permalink"]}\n'

    markdown = markdown.replace('`', '~')

    org_content = f'''* {front_matter['title']}{tags}
  CLOSED: [{date}]
  :PROPERTIES:
  :EXPORT_FILENAME: {filename}
{permalink}  :END:

{markdown}'''

    with open(org_filename, 'w') as org_file:
        org_file.write(org_content)

if __name__ == '__main__':
    for filename in sys.argv[1:]:
        convert(filename)