import mastodon
from mastodon import Mastodon
from mastodon.Mastodon import MastodonAPIError
from model import MastodonApp, Account, OAuthToken, Post
from requests import head
from app import db
from math import inf
import iso8601

def get_or_create_app(instance_url, callback, website):
    instance_url = instance_url
    app = MastodonApp.query.get(instance_url)
    try:
        head('https://{}'.format(instance_url)).raise_for_status()
        proto = 'https'
    except Exception:
        head('http://{}'.format(instance_url)).raise_for_status()
        proto = 'http'

    if not app:
        client_id, client_secret = Mastodon.create_app('forget',
                scopes=('read', 'write'),
                api_base_url='{}://{}'.format(proto, instance_url),
                redirect_uris=callback,
                website=website,
            )
        app = MastodonApp()
        app.instance = instance_url
        app.client_id = client_id
        app.client_secret = client_secret
        app.protocol = proto
    return app

def anonymous_api(app):
    return Mastodon(app.client_id,
            client_secret = app.client_secret,
            api_base_url='{}://{}'.format(app.protocol, app.instance),
            )

def login_url(app, callback):
    return anonymous_api(app).auth_request_url(
            redirect_uris=callback,
            scopes=('read', 'write',)
            )

def receive_code(code, app, callback):
    api = anonymous_api(app)
    access_token = api.log_in(
            code=code,
            scopes=('read', 'write'),
            redirect_uri=callback,
            )

    remote_acc = api.account_verify_credentials()
    acc = account_from_api_object(remote_acc, app.instance)
    acc = db.session.merge(acc)
    token = OAuthToken(token = access_token)
    token = db.session.merge(token)
    token.account = acc

    return token


def get_api_for_acc(account):
    app = MastodonApp.query.get(account.mastodon_instance)
    for token in account.tokens:
        api = Mastodon(app.client_id,
                client_secret = app.client_secret,
                api_base_url = '{}://{}'.format(app.protocol, app.instance),
                access_token = token.token,
                ratelimit_method = 'throw',
                #debug_requests = True,
            )

        # api.verify_credentials()
        # doesnt error even if the token is revoked lol
        # https://github.com/tootsuite/mastodon/issues/4637
        # so we have to do this:
        tl = api.timeline()
        if 'error' in tl:
            db.session.delete(token)
            continue
        return api

    account.force_log_out()


def fetch_acc(acc, cursor=None):
    api = get_api_for_acc(acc)
    if not api:
        print('no access, aborting')
        return None

    newacc = account_from_api_object(api.account_verify_credentials(), acc.mastodon_instance)
    acc = db.session.merge(newacc)

    kwargs = dict(limit = 40)
    if cursor:
        kwargs.update(cursor)

    if 'max_id' not in kwargs:
        most_recent_post = Post.query.with_parent(acc).order_by(db.desc(Post.created_at)).first()
        if most_recent_post:
            kwargs['since_id'] = most_recent_post.mastodon_id

    statuses = api.account_statuses(acc.mastodon_id, **kwargs)

    if statuses:
        kwargs['max_id'] = +inf

        for status in statuses:
            post = post_from_api_object(status, acc.mastodon_instance)
            db.session.merge(post)
            kwargs['max_id'] = min(kwargs['max_id'], status['id'])

    else:
        kwargs = None

    db.session.commit()

    return kwargs

def post_from_api_object(obj, instance):
    return Post(
            mastodon_instance = instance,
            mastodon_id = obj['id'],
            favourite = obj['favourited'],
            has_media = 'media_attachments' in obj and bool(obj['media_attachments']),
            created_at = iso8601.parse_date(obj['created_at']),
            author_id = account_from_api_object(obj['account'], instance).id,
            direct = obj['visibility'] == 'direct',
        )

def account_from_api_object(obj, instance):
    return Account(
            mastodon_instance = instance,
            mastodon_id = obj['id'],
            screen_name = obj['username'],
            display_name = obj['display_name'],
            avatar_url = obj['avatar'],
            reported_post_count = obj['statuses_count'],
        )

def refresh_posts(posts):
    acc = posts[0].author
    api = get_api_for_acc(acc)
    if not api:
        raise Exception('no access')

    new_posts = list()
    for post in posts:
        try:
            status = api.status(post.mastodon_id)
            new_post = db.session.merge(post_from_api_object(status, post.mastodon_instance))
            new_posts.append(new_post)
        except MastodonAPIError as e:
            if str(e) == 'Endpoint not found.':
                db.session.delete(post)
            else:
                raise e

    return new_posts

def delete(post):
    api = get_api_for_acc(post.author)
    api.status_delete(post.mastodon_id)
    db.session.delete(post)