import json
import logging
import os
from pathlib import Path
from urllib.parse import quote_plus

import cachecontrol
import flask
import jinja2
import requests
import tableschema
from cachetools.func import ttl_cache

import opendataschema

from . import config

log = logging.getLogger(__name__)


@ttl_cache(maxsize=24, ttl=5*60)
def schema_from_url(url):
    return tableschema.Schema(url)


# And load schema catalogs which urls are found in config.json
schema_catalog_map = {}
if config.HOMEPAGE_CONFIG:
    log.info("Initializing homepage sections...")
    caching_session = cachecontrol.CacheControl(requests.Session())
    for section in config.HOMEPAGE_CONFIG['sections']:
        if isinstance(section['catalog'], str) and section['catalog'].startswith('http'):
            code = section['code']
            url = section['catalog']
            schema_catalog_map[code] = opendataschema.SchemaCatalog(url, session=caching_session)

# Flask things
app = flask.Flask(__name__)
app.secret_key = config.SECRET_KEY


# Jinja2 url_quote_plus custom filter
# https://stackoverflow.com/questions/12288454/how-to-import-custom-jinja2-filters-from-another-file-and-using-flask
blueprint = flask.Blueprint('filters', __name__)


@jinja2.contextfilter
@blueprint.app_template_filter()
def urlencode(context, value):
    return quote_plus(value)


# Keep this import after app initialisation (to avoid cyclic imports)
from . import views  # noqa isort:skip