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

from flask import Blueprint, redirect, request, flash, make_response, current_app
from flask.ext.mako import 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_
import requests
import short_url

from models import StickyNote, get_session

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

EXPIRY_DELTAS = {
    u'10min': timedelta(minutes=10),
    u'1d': timedelta(days=1),
    u'1w': timedelta(days=7),
    u'2w': timedelta(days=14),
    u'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 = {u'secret': secret, u'response': response}
    if remote_ip:
        data[u'remoteip'] = remote_ip
    response = requests.post(u'https://www.google.com/recaptcha/api/siteverify', data=data)
    try:
        json_response = response.json()
        print(json_response)
        return json_response[u'success']
    except ValueError:
        print response
        return False


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


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


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


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


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

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

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


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

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


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