import json
import os
import re
import time
import traceback
from pprint import pprint

import hug
import requests

import db
import dir_utils
import mattermost_client
import mattermost_communication
import sync_gitea as sync
from config import config
from utils import id_to_url, url_to_id


def find_codimd_files_on_mattermost():
    mattermost = mattermost_client.MMApi()
    channels = config["mattermost"]["scrape_channel_ids"]

    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():
            # old: r"(https?://[^\s#?]+)"
            url_regex = r"https?:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)"
            urls = re.findall(url_regex, 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

                # Remove everything after the # of ?
                for char in ["#", "?"]:
                    cut_idx = url.rfind(char) if url.rfind(char) != -1 else len(url)
                    url = url[:cut_idx]

                # pprint(post)
                print(url)
                db.add_discovered_url(url, post)

    # 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 file_id, file_info in db.get_files().items():
        local_file_path = f"data/note-{file_id}.md"
        url = file_info["source_url"]
        with open(local_file_path, "w") as f:
            print(f"Downloading url {url}")
            f.write(read_note(url))
            db.set_local_file_path(file_id, local_file_path)


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

    for file_id, file_info in db.get_files().items():
        file_path = file_info["local_file_path"]
        metadata = dir_utils.find_metadata(file_path)
        if metadata is not None:
            is_new_file, new_file_info = db.mark_file_valid(file_id, metadata)
            if is_new_file:
                mattermost_communication.report_newly_found_file(file_id, new_file_info)
        else:
            changed, new_file_info = db.mark_file_invalid(file_id)
            if changed and post_mattermost_hint:
                mattermost_communication.report_newly_found_but_invalid_file(
                    file_id, new_file_info
                )

    return db._load_db()


def sync_files_to_gitea():
    repo, api_handler = sync.init_sync()
    for file_id, file_info in db.get_files().items():
        if file_info["valid"]:
            local_file_path = file_info["local_file_path"]
            sync_to = file_info["metadata"]["sync-to"]
            try:
                sync.sync_file(repo, api_handler, local_file_path, sync_to)
            except Exception as e:
                print("Critical error: Failed to sync file to Gitea")
                traceback.print_exc()


@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(post_mattermost_hint=True)
    print()
    print("================================================")
    print("== Syncing files to git ==")
    sync_files_to_gitea()
    print()

    # return db._load_db()