import json
import os
import re
import time

import hug
import requests

import db
import dir_utils
from mattermost import MMApi


def find_codimd_files_on_mattermost():
    mattermost = MMApi()
    channels = [
        "hrx6pgfswjbttcj8nim3jrwe7w",  # bestuur-INTERN
        "uda7ax9poprduq8ob56e1fqk4e",  # bestuur
    ]

    last_fetch_time = db.get_latest_sync_time()
    current_fetch_time = int(time.time() * 1000)
    print(f"Fetching posts since: {last_fetch_time}")
    for channel_id in channels:
        print(f"Fetching posts for channel_id: {channel_id}")

        # TODO Use first statement for all posts
        posts = mattermost.get_posts_for_channel(channel_id, last_fetch_time)
        # posts = mattermost.posts.get_posts_for_channel(channel_id)

        print(f"Scraping {len(posts)} posts")
        for post_id, post in posts.items():
            urls = re.findall(r"(https?://[^\s#?]+)", post["message"])
            for url in urls:
                idx = url.find("codimd.zeus.gent")
                if idx == -1:
                    # In this case it's an url but not for codimd
                    continue

                print(url)
                db.add_discovered_file(url)

    # When everything succeeded. Save the current unix time as latest fetched moment
    db.set_latest_sync_time(current_fetch_time)


def read_note(url):
    return requests.get(f"{url}/download").text


def download_files():
    for url in db.get_discovered_files():
        with open(f'data/note-{url[url.rfind("/") + 1:]}.md', "w") as f:
            print(f"Downloading url {url}")
            f.write(read_note(url))


def validate_downloaded_files():
    path = "data"
    dir_list = os.listdir(path)

    for filename in dir_list:
        metadata = dir_utils.find_metadata("data/" + filename)
        if metadata is not None:
            db.add_valid_file(filename, metadata)

    return db._load_db()


@hug.get("/sync-mattermost")
def sync_mattermost():
    print()
    print("=======================================")
    print("== Finding urls posted on mattermost ==")
    find_codimd_files_on_mattermost()
    print()
    print("=============================")
    print("== Downloading found files ==")
    download_files()
    print()
    print("================================================")
    print("== Finding valid files in the downloaded ones ==")
    validate_downloaded_files()
    print()

    return db._load_db()