"""Cleanup old posts that did not have any interactions"""

# ----- imports ----- #

from dotenv import load_dotenv
from mastodon import Mastodon, MastodonRatelimitError
from os import getenv

def cleanup(offset: int = 200, limit: int = 40, id: int | None = None):
    """Delete old posts without any interactions.

    Args:
        offset (int, optional): After how many posts should the function start. Defaults to 200.
        limit (int, optional): Size of posts batches. Defaults to 40.
        id (int | None, optional): Post ID from where to start cleanup. If this value is set, the offset will be ignored. Defaults to None.
    """
    # ----- initialization ----- #

    # load .env
    load_dotenv()

    # initialize mastodon
    mastodon = Mastodon(
        access_token = getenv("MASTODON_USER_SECRET"),
        api_base_url = getenv("MASTODON_URL"),
        ratelimit_method="throw"
    )

    # ----- go *limit* posts into the past, if manual id is not set ----- #

    def get_account_statuses(max_id: int, limit: int = 40) -> list:
        if id_oldest_of_last_posts == -1:
            return mastodon.account_statuses(getenv("MASTODON_USER_ID"), exclude_replies=True, limit=limit)
        else:
            return mastodon.account_statuses(getenv("MASTODON_USER_ID"), exclude_replies=True, max_id=max_id, limit=limit)

    if id is None:
        last_posts = []
        id_oldest_of_last_posts = -1
        iterations = offset // 40
        remainder = offset % 40
        # get latest posts until offset is reached
        for i in range(iterations):
            last_posts = get_account_statuses(max_id=id_oldest_of_last_posts, limit=40)
            if len(last_posts) == 0:
                print("Offset is higher than the number of posts in the past.")
                return
            id_oldest_of_last_posts = last_posts[-1]["id"]
            print(f"Currently at offset {(i + 1) * 40}, last ignored post: {last_posts[-1]['url']}")
        if remainder != 0:
            last_posts = get_account_statuses(max_id=id_oldest_of_last_posts, limit=remainder)
            if len(last_posts) == 0:
                print("Offset is higher than the number of posts in the past.")
                return
            id_oldest_of_last_posts = last_posts[-1]["id"]
            print(f"Currently at offset {iterations * 40 + remainder}, last ignored post: {last_posts[-1]['url']}")
    else:
        id_oldest_of_last_posts = id
        last_posts = mastodon.account_statuses(getenv("MASTODON_USER_ID"), exclude_replies=True, max_id=id, limit=limit)
        # return if there are no posts to check
        if len(last_posts) == 0:
            print("There are no older posts than the given id.")
            return

    # ----- delete old inactive posts ----- #

    # default: check 100 batches of 40 posts
    # this usually tries until the rate limit is triggered or there are no more posts
    # if hitting the rate limit is undesired, reduce the number of iterations
    for i in range(100):
        # skip getting new batch in the first iteration if the id was set manually
        if i != 0 or id is None:
            # find id of the currently oldest post
            last_post = last_posts[-1]
            if last_post["favourites_count"] != 0 or last_post["reblogs_count"] != 0 or last_post["replies_count"] != 0:
                id_oldest_of_last_posts = last_post["id"]
            # get next batch of posts
            last_posts = mastodon.account_statuses(getenv("MASTODON_USER_ID"), exclude_replies=True, max_id=id_oldest_of_last_posts, limit=limit)

        # return if there are no more posts to check
        if len(last_posts) == 0:
            return

        # delete all old posts of the current batch
        for submission in last_posts:
            # if post has no favorites, boosts or replies, delete it
            if submission["favourites_count"] == 0 and submission["reblogs_count"] == 0 and submission["replies_count"] == 0:
                print("Deleting post:", submission["url"])
                try:
                    mastodon.status_delete(submission["id"])
                except MastodonRatelimitError:
                    print("Hit rate limit while trying to delete post:", submission["url"])
                    return
            else:
                print("Ignoring post:", submission["url"])

if __name__ == "__main__":
    cleanup(offset=200, limit=40, id=None)