import praw
import os
import os.path
import json
import time


# Helper to get env var or default
def env_or_default(var, default):
    return os.environ.get(var, default)


# Create config/config.py from environment if missing or empty
default_config_path = os.path.join('config', 'config.py')


def write_config_from_env():
    os.makedirs('config', exist_ok=True)
    with open(default_config_path, 'w') as f:
        f.write(
            f'username = "{env_or_default("USERNAME", "")}"\n'
            f'password = "{env_or_default("PASSWORD", "")}"\n'
            f'client_id = "{env_or_default("CLIENT_ID", "")}"\n'
            f'client_secret = "{env_or_default("CLIENT_SECRET", "")}"\n'
            f'user_agent = "{env_or_default("USER_AGENT", "Flair Timer ModMail Bot")}"\n'
            '\n'
            f'subreddit = "{env_or_default("SUBREDDIT", "")}"\n'
            f'interval = {env_or_default("INTERVAL", "30")}\n'
            f'searchlimit = {env_or_default("SEARCHLIMIT", "600")}\n'
        )
    print(f"Configuration file auto-populated from environment variables at {default_config_path}.")


# Check if config file exists and is non-empty, else generate from env
def config_needs_populating():
    if not os.path.exists(default_config_path):
        return True
    try:
        with open(default_config_path, 'r') as f:
            content = f.read().strip()
            return len(content) == 0
    except Exception:
        return True


if config_needs_populating():
    write_config_from_env()


# Import main config
import config


# Create default flairconfig.py if missing
flair_config_path = os.path.join('config', 'flairconfig.py')


def write_default_flairconfig():
    if not os.path.exists(flair_config_path):
        os.makedirs(os.path.dirname(flair_config_path), exist_ok=True)
        with open(flair_config_path, 'w') as f:
            f.write('# flairconfig.py\n')
            f.write('# This file defines the list of flair time configs for the bot.\n')
            f.write('flair_times = [\n')
            f.write('    {\n')
            f.write('        "flair_text": "Waiting for OP",\n')
            f.write('        "hours": 48,\n')
            f.write('        "messagetitle": "Modmail Notification",\n')
            f.write('    },\n')
            f.write(']\n')
        print(f"Default flairconfig.py created at {flair_config_path}.")


write_default_flairconfig()


# Load flair_times from flairconfig.py
import importlib.util
spec = importlib.util.spec_from_file_location("flairconfig", flair_config_path)
flairconfig = importlib.util.module_from_spec(spec)
spec.loader.exec_module(flairconfig)
flair_times = getattr(flairconfig, "flair_times", [])
 
def authentication():
    print("Authenticating...")
    reddit = praw.Reddit(
        username=config.username,
        password=config.password,
        client_id=config.client_id,
        client_secret=config.client_secret,
        user_agent=config.user_agent
    )
    print("Authenticated as {}.".format(reddit.user.me()))
    return reddit


def main(reddit, all_posts: dict):
    # all_posts structure: {flair_text: {submission_id: timestamp}}
    while True:
        for flair_cfg in flair_times:
            flair_text = flair_cfg["flair_text"]
            hours = flair_cfg["hours"]
            messagetitle = flair_cfg.get("messagetitle", "Modmail Notification")

            # Ensure posts dict for this flair
            posts = all_posts.setdefault(flair_text, {})

            for submission in reddit.subreddit(config.subreddit).new(limit=config.searchlimit):
                if not submission.saved:
                    if submission.id not in posts and submission.link_flair_text == flair_text:
                        posts[submission.id] = time.time()
                        print(f"Post {submission} has been flaired {flair_text}")
                    if submission.id in posts and submission.link_flair_text != flair_text:
                        posts.pop(submission.id)
                        print(f"Post {submission} has been unflaired {flair_text}")

            expired = []
            for submission_id, flair_time in posts.items():
                if time.time() > flair_time + (hours * 60 * 60):
                    expired.append(submission_id)

            for submission_id in expired:
                posts.pop(submission_id)
                subm = reddit.submission(submission_id)
                subm.save()
                data = {
                    "subject": messagetitle,
                    "text": f"It has been {hours/24} day/s since this was flaired [{flair_text}](https://old.reddit.com{subm.permalink})",
                    "to": "/r/{}".format(config.subreddit),
                }
                reddit.post("api/compose/", data=data)
                print(f"Post {submission_id} has been flaired {flair_text} for {hours} hours, sent modmail")

        save_posts(all_posts)
        time.sleep(config.interval)
 
def load_posts():
    if not os.path.exists("config/posts.json"):
        with open("config/posts.json", "w+") as file:
            json.dump({}, file)
    with open("config/posts.json", "r+") as file:
        data = json.load(file)
        # Ensure structure: {flair_text: {submission_id: timestamp}}
        if not isinstance(data, dict):
            return {}
        return data


def save_posts(data):
    with open('config/posts.json', 'w+') as file:
        json.dump(data, file)


while True:
    try:
        posts = load_posts()
        main(reddit=authentication(), all_posts=posts)
    except Exception as e:
        print(e)