#! /usr/bin/env python3

__author__ = "Oleg Broytman <phd@phdru.name>"
__copyright__ = "Copyright (C) 2020-2024 PhiloSoft Design"

import os
from blog_db import blog_root, load_blog
blog = load_blog()

# Run a loop over the blog posts:
# for every post note its previous and next posts
# and compare timestamps of previous and next HTML
# with the timestamp of the current template;
# if HTMLs are older - remove them,
# they will be regenerated with the corrected back/forth links.


def fullpath(key, post):
    return os.path.join(*(blog_root,) + key + (post[0],))


def html(tmpl):
    return tmpl[:-len('tmpl')] + 'html'


prev_key = prev_blog_post = current_key = current_blog_post = \
    next_key = next_blog_post = None
for key in sorted(blog):
    for blog_post in sorted(blog[key]):
        if current_blog_post:
            prev_key = current_key
            prev_blog_post = current_blog_post
        if next_blog_post:
            current_key = next_key
            current_blog_post = next_blog_post
        next_key = key
        next_blog_post = blog_post

        if current_key:
            current_tmpl = fullpath(current_key, current_blog_post)
            try:
                current_mtime = os.path.getmtime(current_tmpl)
            except OSError:
                current_mtime = None

        if prev_key:
            prev_html = html(fullpath(prev_key, prev_blog_post))
            try:
                prev_mtime = os.path.getmtime(prev_html)
            except OSError:
                pass
            else:
                if current_mtime is not None and (prev_mtime < current_mtime):
                    os.remove(prev_html)
        if current_key and next_key:
            next_html = html(fullpath(next_key, next_blog_post))
            try:
                next_mtime = os.path.getmtime(next_html)
            except OSError:
                pass
            else:
                if current_mtime is not None and (next_mtime < current_mtime):
                    os.remove(next_html)

if blog:
    current_tmpl = fullpath(key, blog_post)
    try:
        current_mtime = os.path.getmtime(current_tmpl)
    except OSError:
        pass
    else:
        current_mtime = None

    prev_html = html(fullpath(current_key, current_blog_post))
    try:
        prev_mtime = os.path.getmtime(prev_html)
    except OSError:
        pass
    else:
        if current_mtime is not None and (prev_mtime < current_mtime):
            os.remove(prev_html)