# -*- coding: utf-8 -*-
"""
The views
"""
import logging
from datetime import timedelta, datetime

import requests
import short_url
from flask import Blueprint, redirect, request, flash, make_response, current_app, render_template
from pygments import highlight
from pygments.formatters.html import HtmlFormatter
from pygments.lexers import get_lexer_by_name, get_all_lexers
from sqlalchemy import or_

from stickynotes.db import session
from stickynotes.models import StickyNote


log = logging.getLogger(__name__)
views = Blueprint('views', __name__)


EXPIRY_DELTAS = {
    '10min': timedelta(minutes=10),
    '1d': timedelta(days=1),
    '1w': timedelta(days=7),
    '2w': timedelta(days=14),
    '1m': timedelta(days=30)
}


def _is_recaptcha_valid(secret, response, remote_ip=None):
    """
    POST to the recaptcha service to check if the recaptcha is valid
    """
    data = {'secret': secret, 'response': response}
    if remote_ip:
        data['remoteip'] = remote_ip
    response = requests.post('https://www.google.com/recaptcha/api/siteverify', data=data)
    try:
        json_response = response.json()
        return json_response['success']
    except ValueError:
        return False


@views.route('/', methods=['GET'])
def index():
    """
    Add a new sticky note
    """
    all_lexers = [(lexer[1][0], lexer[0]) for lexer in get_all_lexers() if len(lexer) > 1 and len(lexer[1]) > 0]
    all_lexers.sort(key=lambda x: x[1].lower())
    recaptcha_site_key = current_app.config.get('RECAPTCHA_SITE_KEY')
    return render_template('index.html', lexers=all_lexers, recaptcha_site_key=recaptcha_site_key)


@views.route('/notes', methods=['GET'])
def notes():
    """
    Show a list of recent notes
    """
    recent_notes = StickyNote.query\
        .filter(or_(StickyNote.expiry == None, StickyNote.expiry < datetime.utcnow()))\
        .filter(~StickyNote.private)\
        .order_by(StickyNote.created.desc())\
        .limit(10)                                                                              # noqa
    return render_template('notes.html', recent=recent_notes)


@views.route('/about', methods=['GET'])
def about():
    """
    Show the about page
    """
    return render_template('about.html')


@views.route('/', methods=['POST'])
def save():
    """
    Save a sticky note
    """
    # Check if the recaptcha is valid
    recaptcha_secret_key = current_app.config.get('RECAPTCHA_SECRET_KEY')
    if recaptcha_secret_key:
        is_recaptcha_valid = False
        try:
            is_recaptcha_valid = _is_recaptcha_valid(recaptcha_secret_key, request.form['g-recaptcha-response'])
        except KeyError:
            flash('Unable to verify you, don\'t forget to complete the captcha.', 'danger')
            print('No form variable')
    else:
        is_recaptcha_valid = True
    if not is_recaptcha_valid:
        return redirect('/')
    # Save the note
    try:
        created = datetime.utcnow()
        expiry = EXPIRY_DELTAS.get(request.form['expiry'])
        if expiry:
            expiry = created + expiry
        source = request.form['source']
        lexer = request.form['language']
        title = request.form.get('title', '')
        private = True if request.form.get('private') else False
        string_id = ''.join([source, lexer, title, created.isoformat()])
        url = short_url.encode_url(sum([ord(char) for char in string_id]), min_length=8)
        note = StickyNote(
            title=title,
            source=source,
            lexer=lexer,
            created=created,
            expiry=expiry,
            private=private,
            url=url
        )
        session.add(note)
        session.commit()
        return redirect('/' + note.url)
    except Exception as e:
        flash(str(e), 'danger')
        session.rollback()
        return redirect('/')


@views.route('/<string:note_url>', methods=['GET'])
def view(note_url):
    """
    Show a sticky note

    :param note_url: The note to show
    """
    note = StickyNote.query.filter(StickyNote.url == note_url).scalar()
    if not note:
        flash('That note does not exist', 'danger')
        return redirect('/')

    lexer = get_lexer_by_name(note.lexer)
    formatter = HtmlFormatter(linenos=True, cssclass='source')
    result = highlight(note.source, lexer, formatter)
    return render_template('view.html', note=note, source=result)


@views.route('/raw/<string:note_url>', methods=['GET'])
def raw(note_url):
    """
    Show the raw version of a  sticky note

    :param note_url: The note to show
    """
    note = StickyNote.query.filter(StickyNote.url == note_url).scalar()
    if not note:
        flash('That note does not exist', 'danger')
        return redirect('/')
    return render_template('raw.html', source=note.source), 200, {'Content-Type': 'text/plain; charset=utf-8'}


@views.route('/pygments.css', methods=['GET'])
def pygments_css():
    """
    Return the Pygments CSS to the browser
    """
    response = make_response(HtmlFormatter(style='nord').get_style_defs())
    response.headers['Content-Type'] = 'text/css'
    return response