#!/usr/bin/env python3
# @python3
# @author Kalman Olah <hello@kalmanolah.net>
"""pdoc - a puppet documentation generator thingy."""
import os
import re
import fnmatch
import click
from datetime import datetime

__VERSION__ = '0.0.1'
__DOC_TEMPLATE__ = """
# == {type}: {name}
#
# Full description of {type} {name} here.
#
# === Parameters
#{parameters}
# === Examples
#
#  class {{ 'ntp':
#    servers => [ 'pool.ntp.org', 'ntp.local.company.com' ],
#  }}
#
# === Authors
#
# {author} <{email}>
#
# === Copyright
#
# Copyright {year} {author}, unless otherwise noted.
#
"""
__PARAM_TEMPLATE__ = """
# [*{key}*]
#   Explanation of what this parameter affects.
#   Defaults to {value}.
#
"""


def show_version(ctx, value):
    """Print version information and exit."""
    if not value:
        return

    click.echo('pdoc %s' % __VERSION__)
    ctx.exit()


@click.command()
@click.option('--version', '-v', is_flag=True, help='Print version information and exit.',
              callback=show_version, expose_value=False, is_eager=True)
@click.option('--really', '-r', is_flag=True, help='Really apply changes.')
@click.option('--author', '-a', default='John Doe', help='Author name to use in generated documentation.')
@click.option('--email', '-e', default='john.doe@domain.com', help='Author email to use in generated documentation.')
@click.argument('path', type=click.Path(exists=False, file_okay=True, dir_okay=True,
                writable=True, readable=True, resolve_path=True), default='./')
@click.pass_context
def pdoc(ctx, really, author, email, path):
    """pdoc - a puppet documentation generator thingy."""
    # If path if a file stick it into a paths list, if not perform some mad
    # globbing
    if os.path.isfile(path):
        paths = (path) if path.endswith('.pp') else ()
    else:
        paths = [os.path.join(dirpath, f)
                 for dirpath, dirnames, files in os.walk(path)
                 for f in fnmatch.filter(files, '*.pp')]

    click.echo('Found %s puppet manifests; iterating..' % click.style(str(len(paths)), fg='green', bold=True))

    for p in paths:
        # Read first character of the file: if it's a hashtag it means we have
        # docs; if it's not, we should add docs
        with open(p, 'r') as file:
            first = file.read(1)

        # If the first character is a hashtag, do nothing
        if first is '#':
            continue

        click.echo('Adding documentation to %s' % click.style(p, fg='blue', bold=True))

        # Grab file contents so we can do matching and stuff
        with open(p, 'r') as file:
            content = file.read()

        # Try to extract type, name and parameters
        pattern = re.compile(r"\s*(\w+)\s+([\w:]+)[\s\w:]*([\"'\w\s,=\$\(\):]*)\s*{.*}\s*", re.DOTALL)
        matches = re.match(pattern, content)

        type = 'type' if matches.group(1) is 'define' else matches.group(1)
        name = matches.group(2)

        parameters = ''
        params = re.sub(r"[\s\(\)]", '', matches.group(3))
        params = re.split(',', params)

        for param in params:
            split = re.split('=', param)
            value = split[1] if len(split) > 1 else 'undef'
            parameters += __PARAM_TEMPLATE__.rstrip().format(key=split[0], value=value)

        docs = __DOC_TEMPLATE__.strip().format(
            type=type,
            name=name,
            parameters=parameters,
            author=author,
            email=email,
            year=datetime.utcnow().year
        )

        if really:
            with open(p, 'w') as file:
                file.write(docs + '\n' + content)

    click.echo(click.style('Done!', fg='green', bold=True))

"""Standard import guard."""
if __name__ == '__main__':
    pdoc(obj={}, auto_envvar_prefix='PDOC')