import datetime
import praw
import os
import json
import requests

client_id = os.environ["REDDIT_CLIENT_ID"]
client_secret = os.environ["REDDIT_CLIENT_SECRET"]
reddit_pass = os.environ["REDDIT_PASSWORD"]
username = os.environ["REDDIT_USERNAME"]
user_agent = "Community Roundup Post"
token = os.environ["GIST_TOKEN"]
gist_id = os.environ["GIST_ID"]
sub = "developersIndia"


def is_last_day_of_month():
    today = datetime.date.today()
    tomorrow = today + datetime.timedelta(days=1)
    return tomorrow.day == 1

def get_posts_by_flair(subreddit, flair):
    current_year = datetime.date.today().year
    current_month = datetime.date.today().month
    posts = []
    for post in subreddit.search(f'flair_name:"{flair}"', time_filter='month'):
        post_date = datetime.datetime.fromtimestamp(post.created_utc)
        if post_date.year == current_year and post_date.month == current_month:
            posts.append(post)

    posts = sorted(posts, key=lambda post: post.created_utc, reverse=True)
    return posts


def get_weekly_discussion_posts(subreddit):
    flair = next(
        filter(
            lambda flair: "Weekly Discussion" in flair["flair_text"],
            subreddit.flair.link_templates.user_selectable(),
        )
    )

    return get_posts_by_flair(subreddit, flair["flair_text"])


def get_i_made_this_posts(subreddit):
    flair = next(
        filter(
            lambda flair: "I Made This" in flair["flair_text"],
            subreddit.flair.link_templates.user_selectable(),
        )
    )

     # Get all posts with the specified flair
    posts = get_posts_by_flair(subreddit, flair["flair_text"])

    # Sort the posts by upvotes and then comments in descending order
    posts = sorted(posts, key=lambda post: (post.score, post.num_comments), reverse=True)

    # Return only the top 10 posts
    return posts[:10]


def get_gist_content(gist_id):
    headers = {
        "Authorization": f"token {token}",
        "Accept": "application/vnd.github.v3+json",
    }
    response = requests.get(f"https://api.github.com/gists/{gist_id}", headers=headers)
    gist = response.json()
    filename = list(gist["files"].keys())[0]
    return gist["files"][filename]["content"]


def get_monthly_roundup():
    saved_collection_posts = json.loads(get_gist_content(gist_id))
    # filter posts for this month & year
    saved_collection_posts = list(
        filter(
            lambda post: datetime.datetime.strptime(
                post["created_at"], "%Y-%m-%dT%H:%M:%S"
            ).year == datetime.date.today().year and
            datetime.datetime.strptime(
                post["created_at"], "%Y-%m-%dT%H:%M:%S"
            ).month == datetime.date.today().month,
            saved_collection_posts["posts"],
        )
    )
    return saved_collection_posts


def create_community_roundup_post(subreddit, posts, i_made_this_posts, weekly_discussion_posts):
    flair = next(
        filter(
            lambda flair: "Community Roundup" in flair["flair_text"],
            subreddit.flair.link_templates.user_selectable(),
        )
    )

    title = "Community Roundup: List of must read posts & discussions that happened this month - {month} {year}".format(
        month=datetime.date.today().strftime("%B"), year=datetime.date.today().year
    )

    text = "\n## Community Threads\n|S.No|Discussions started by members|"
    text += "\n|--------|--------|\n"
    footer_text = """\n\n
---

**Community Roundup is posted on the last day of each month. To explore a compilation of all interesting posts and community threads over time, [visit our wiki](https://www.reddit.com/r/developersIndia/wiki/community-threads/).**\n
The collection is curated by our volunteer team & is independent of the number of upvotes and comments (except for "I made This" posts). If you believe we may have overlooked any engaging posts or discussions, please share them with us via [modmail](https://reddit.com/message/compose?to=r/developersIndia&subject=Community%20Threads%20Collection%20Suggestion&message=Hey%20folks%2C%0A%0A%3Cpost%20link%3E).\n
"""
    posts_counter = 0
    for post in posts:
        posts_counter += 1
        text += f"| {posts_counter} | [**{post['title']}**]({post['url']}) |\n"

    text += "\n## Weekly Discussions\n|Started by Volunteer/Mod Team|\n|--------|\n"
    for post in weekly_discussion_posts:
        text += f"| [**{post.title}**]({post.url}) |\n"


    text += "## I Made This\n|Top 10 posts|\n|--------|\n"
    for post in i_made_this_posts:
        text += f"| [**{post.title}**]({post.url}) |\n"


    text = text + footer_text

    submission = subreddit.submit(
        title,
        selftext=text,
        flair_id=flair["flair_template_id"],
    )
    submission.mod.approve()
    submission.mod.sticky()
    submission.mod.distinguish()
    submission.mod.lock()

    return submission


def main():
    reddit = praw.Reddit(
        client_id=client_id,
        client_secret=client_secret,
        username=username,
        password=reddit_pass,
        user_agent=user_agent,
    )

    subreddit = reddit.subreddit(sub)

    if is_last_day_of_month():
        posts = get_monthly_roundup()
        if len(posts) == 0:
            print("No posts found in the collection for this month. Skipping")
            return
        i_made_this_posts = get_i_made_this_posts(subreddit)
        weekly_discussion_posts = get_weekly_discussion_posts(subreddit)
        create_community_roundup_post(subreddit, posts, i_made_this_posts, weekly_discussion_posts)
        print("Community Roundup post created successfully!")
    else:
        print("Skipping. Not the last day of the month")


if __name__ == "__main__":
    main()