"""Scrape mastodon tag searches and feed into your search."""
import sys
import urllib.robotparser
import urllib.parse

import yaml
import requests


def fetch_toots(conf):
    toots = set()
    for instance in conf.get("instances", []):
        for tag in conf.get("tags", []):
            try:
                uri = f"https://{instance}/tags/{tag}.json"
                if _check_path_allowed(uri):
                    curr_posts = requests.get(
                       uri 
                    ).json()
            except Exception as e:
                print("Got some error fetching toots, continuing...")
                print(e)
            for post in curr_posts.get("orderedItems", []):
                toots.add(post)
    return toots


def search_for(toots):
    for toot in toots:
        headers = {
            "Authorization": f"Bearer {config.get('own_bearer_token', '')}"
        }
        print(f"searching for {toot}...")
        try:
            requests.get(f"https://{config.get('own_instance', '')}/api/v2/search?type=statuses&resolve=true&q={toot}", headers=headers, timeout=30)
        except Exception as e:
            print(f"Searching for {toot} failed *shrug*")
            print(e)


def _check_path_allowed(uri):
    rp = urllib.robotparser.RobotFileParser()
    scheme, netloc, _, _, _, _ = urllib.parse.urlparse(uri)
    rp.set_url(f"{scheme}://{netloc}/robots.txt")
    rp.read()
    return rp.can_fetch('*', uri)


def __check_lst_of_str(a):
    return bool(a) and isinstance(a, list) and all(isinstance(elem, str) for elem in a)


def __check_str(a):
    return bool(a) and isinstance(a, str)


def __check_nonplain_host(a):
    return 1 in [c in a for c in {':', '/'}]


if __name__ == "__main__":
    try:
        config = yaml.full_load(open('config.yaml', encoding="utf-8").read())
    except Exception as e:
        print("Couldn't open config.yaml. Please check that"
              "it exists and is readable")
        print(e)

    if not __check_lst_of_str(config.get('instances', [])):
        print("*instances* configuration must be a list of strings")
        sys.exit(-1)
    if any(__check_nonplain_host(instance)
           for instance in config.get('instances', [])):
        print("all *instances* must be plain hostnames, no"
              "paths or protcol")
        sys.exit(-1)

    if not __check_lst_of_str(config.get('tags', [])):
        print("*tags* configuration must be a list of strings")
        sys.exit(-1)
    if any('#' in tag for tag in config.get('tags', '')):
        print("*tags* must not contain # charactger")
        sys.exit(-1)

    if not __check_str(config.get('own_instance', "")):
        print("*own_instance* configuration must be a string")
        sys.exit(-1)
    if __check_nonplain_host(config.get('own_instance', '')):
        print("*own_instance* must only contain your instances hostname, no"
              "paths or protocol")
        sys.exit(-1)

    if not __check_str(config.get('own_bearer_token', "")):
        print("*own_bearer_token* configuration must be a string")
        sys.exit(-1)

    toots = fetch_toots(config)
    search_for(toots)