#/bin/python3

import os
import subprocess

import sys

from config.config import *

from utils import utils

from generators import generators


def generate(args):
    """Wrapper for generate_blog(fresh=False)."""
    # pylint: disable=unused-argument
    exit(generators.generate_blog(fresh=False))


def regenerate(args):
    """Wrapper for generate_blog(fresh=True)."""
    # pylint: disable=unused-argument
    exit(generators.generate_blog(fresh=True))


def edit_post_with_editor(path):
    """Launch text editor to edit post at a given path.

    Text editor is $VISUAL, then if empty, $EDITOR, then if still empty,
    vi.

    """
    if "VISUAL" in os.environ:
        editor = os.environ["VISUAL"]
    elif "EDITOR" in os.environ:
        editor = os.environ["EDITOR"]
    else:
        editor = "vi"
    subprocess.call([editor, path])


def new_post(title):
    """Create a new post with metadata pre-filled.

    The path to the new post is printed to stdout.

    Returns
    -------
    0
        On success.

    """
    date = utils.current_datetime()
    filename_date = date.strftime("%Y-%m-%d")
    iso_date = date.isoformat()
    display_date = "%s %d, %d" % (date.strftime("%B"), date.day, date.year)
    title_sanitized = utils.sanitize(title)
    filename = "%s-%s.md" % (filename_date, title_sanitized)
    fullpath = os.path.join(POSTSDIR, filename)
    if not os.path.isdir(POSTSDIR):
        if os.path.exists(POSTSDIR):
            os.remove(POSTSDIR)
        os.mkdir(POSTSDIR, mode=0o755)
    if os.path.exists(fullpath):
        sys.stderr.write("%serror: '%s' already exists, please pick a different title%s\n" %
                         (RED, fullpath, RESET))
        return 1
    with open(fullpath, 'w', encoding='utf-8') as newpost:
        newpost.write("---\n")
        newpost.write('title: "%s"\n' % title)
        newpost.write("date: %s\n" % iso_date)
        newpost.write("date_display: %s\n" % display_date)
        newpost.write("---\n\n")
    sys.stderr.write("New post created in:\n")
    print(fullpath)
    edit_post_with_editor(fullpath)

    return 0