# lumbung.space hashtag publishing bot
# © 2021 roel roscam abbing agplv3
# Makes Hugo posts out of hashtag feeds on Mastodon.
# Requires an account on the Mastodon instance configured.
# Currently does not do any thread recreation and only handles images

import os
import shutil
from pathlib import Path

import jinja2
import requests
from mastodon import Mastodon

# Which instance to login to
instance = "https://social.lumbung.space"

# n.b. if it is the first time you use this script
# You need to register the app:
# https://mastodonpy.readthedocs.io/en/stable/#module-mastodon

# Login credentials for bot account
email = ""
password = ""

# Which hashtags to publish
hashtags = ["jalansesama"]

# your Hugo content directory
output_dir = os.environ.get("OUTPUT_DIR", "path/to/hugo/content")


def login_mastodon_bot():
    mastodon = Mastodon(
        client_id="publishbot_clientcred.secret",
        api_base_url=instance,
    )

    mastodon.log_in(
        email,
        password,
        to_file="publishbot_usercred.secret",
        scopes=["read"],
    )

    return mastodon


def create_frontmatter(post_metadata):
    """
    Parse post metadata and return it as HUGO frontmatter
    """

    frontmatter = ""
    return frontmatter


def download_media(post_directory, media_attachments):
    """
    Download media attached to posts. N.b. currently only images
    See: https://mastodonpy.readthedocs.io/en/stable/#media-dicts
    """

    for item in media_attachments:
        if item["type"] == "image":
            image = localize_media_url(item["url"])
            # TODO check whether this needs to handle delete & redraft with different images
            if not os.path.exists(os.path.join(post_directory, image)):
                # download image
                response = requests.get(item["url"], stream=True)
                with open(os.path.join(post_directory, image), "wb") as img_file:
                    shutil.copyfileobj(response.raw, img_file)
                    print("Downloaded cover image", image)


def create_post(post_directory, post_metadata):
    """
    Create Hugo posts based on Toots/posts retuned in timeline.
    See: https://mastodonpy.readthedocs.io/en/stable/#toot-dicts
    """

    if not os.path.exists(post_directory):
        os.mkdir(post_directory)

    with open(os.path.join(post_directory, "index.html"), "w") as f:
        post = template.render(post_metadata=post_metadata)
        f.write(post)

    download_media(post_directory, post_metadata["media_attachments"])


def localize_media_url(url):
    """
    Returns the filename, used also as custom jinja filter
    """
    return url.split("/")[-1]


def filter_mastodon_urls(content):
    """
    Filters out Mastodon generated URLS for tags
    e.g. <a href="https://social.lumbung.space/tags/jalankita" class="mention hashtag" rel="tag">
    Used also as custom jinja filter
    """
    # TODO
    return content


mastodon = login_mastodon_bot()

output_dir = output_dir


template_dir = os.path.join(Path(__file__).parent.resolve(), "templates")
env = jinja2.Environment(loader=jinja2.FileSystemLoader(template_dir))

env.filters["localize_media_url"] = localize_media_url
env.filters["filter_mastodon_urls"] = filter_mastodon_urls

template = env.get_template("hashtag.md")


if not os.path.exists(output_dir):
    os.mkdir(output_dir)


for hashtag in hashtags:

    hashtag_dir = os.path.join(output_dir, hashtag)
    if not os.path.exists(hashtag_dir):
        os.mkdir(hashtag_dir)

    existing_posts = os.listdir(hashtag_dir)  # list all existing posts

    timeline = mastodon.timeline_hashtag(
        hashtag, local=True, only_media=True
    )  # returns max 20 queries and only with media
    timeline = mastodon.fetch_remaining(
        timeline
    )  # returns all the rest n.b. can take a while because of rate limit

    for post_metadata in timeline:
        post_dir = os.path.join(hashtag_dir, str(post_metadata["id"]))

        # if there is a post in the feed we dont already have locally, make it
        if str(post_metadata["id"]) not in existing_posts:

            if not post_metadata[
                "local_only"
            ]:  # if you get an error here then you are using vanilla Mastodon, this is a Hometown or Glitch only feature
                create_post(post_dir, post_metadata)

        # if we already have the post do nothing, possibly update
        elif str(post_metadata["id"]) in existing_posts:
            # update_post(post_dir, post_metadata)
            existing_posts.remove(
                str(post_metadata["id"])
            )  # create list of posts which have not been returned in the feed

    for post in existing_posts:
        print("deleted", post)  # rm posts that exist but are no longer returned in feed
        shutil.rmtree(os.path.join(hashtag_dir, post))