# Copyright (c) 2018 iliana weller
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import botocore.session
import operator
import requests
import urllib.parse

from flask import Flask, redirect, render_template, request, url_for

app = Flask(__name__)

class ForbiddenEndpointError(Exception):
    pass

@app.route('/<domain>')
def emojo(domain):
    if request.args.get('show_all', '') == 'on':
        show_all = True
    else:
        show_all = False
    if request.args.get('show_animated', '') == 'on':
        show_animated = True
    else:
        show_animated = False

    try:
        url = urllib.parse.urlunsplit(('https', domain, '/api/v1/custom_emojis', '', ''))
        response = requests.get(url)
        if response.status_code == 401:
            raise ForbiddenEndpointError

        if show_all:
            emojo = sorted(response.json(), key=operator.itemgetter('shortcode'))
        else:
            emojo = sorted(filter(lambda x: x.get('visible_in_picker', True), response.json()),
                           key=operator.itemgetter('shortcode'))
        return render_template('emojo.html', domain=domain, emojo=emojo, show_animated=show_animated)
    except requests.exceptions.RequestException as e:
        return render_template('oh_no.html', domain=domain)
    except ForbiddenEndpointError:
        return render_template('forbidden.html', domain=domain)


@app.route('/favicon.ico')
@app.route('/robots.txt')
def no_content():
    return ('', 204)


@app.route('/code')
def code():
    context = request.environ.get('lambda.context')
    session = botocore.session.get_session()
    # region name is detected from lambda environment
    client = session.create_client('lambda')
    code = client.get_function(FunctionName=context.function_name, Qualifier=context.function_version)
    return redirect(code['Code']['Location'], code=303)


@app.route('/', methods=('GET', 'POST'))
def index():
    if request.method == 'POST':
        if 'instance' in request.form:
            show_all = request.form.get('show_all')
            show_animated = request.form.get('show_animated')
            return redirect(
                url_for('emojo', domain=request.form['instance'], show_all=show_all, show_animated=show_animated))
        else:
            return redirect(url_for('index'))
    else:
        return render_template('index.html')