import logging
import os
import time

import redis
import rethinkdb as rdb
from flask import Flask, request, render_template, url_for, redirect, flash, session
from flask.ext.bcrypt import Bcrypt
from flask.ext.login import LoginManager, login_user, logout_user
from flask.ext.assets import Environment
from recaptcha.client import captcha
from werkzeug.routing import BaseConverter

from session import RedisSessionInterface
import config
from wiki import Wiki
from util import to_canonical, remove_ext, mkdir_safe, gravatar_url


class RegexConverter(BaseConverter):
    def __init__(self, url_map, *items):
        super(RegexConverter, self).__init__(url_map)
        self.regex = items[0]

app = Flask(__name__)
app.config.update(config.flask)
app.debug = (config.ENV is not 'PROD')
app.secret_key = config.secret_key
app.static_path = os.sep + 'static'
app.session_interface = RedisSessionInterface()
app.url_map.converters['regex'] = RegexConverter

bcrypt = Bcrypt(app)

login_manager = LoginManager()
login_manager.init_app(app)

assets = Environment(app)
assets.url = app.static_url_path
assets.directory = app.static_folder

cache = redis.StrictRedis(host=config.cache['host'], port=config.cache['port'])

conn = rdb.connect(config.db['host'], config.db['port'], db=config.db['dbname'])

if not config.db['dbname'] in rdb.db_list().run(conn) and config.ENV is not 'PROD':
    # Create default db and repo
    print "Creating DB %s" % config.db['dbname']
    rdb.db_create(config.db['dbname']).run(conn)
    for tbl in ['sites', 'users', 'pages']:
        rdb.table_create(tbl).run(conn)

main_repo_dir = config.repos['main']
repo_dir = config.repos['dir']

# This is down here because of dependencies above
from models import Site, User, CurrentUser


@login_manager.user_loader
def load_user(user_id):
    return CurrentUser(user_id)


w = Wiki(main_repo_dir)


def redirect_url():
    return request.args.get('next') or request.referrer or url_for('index')


def validate_captcha():
    response = captcha.submit(
        request.form['recaptcha_challenge_field'],
        request.form['recaptcha_response_field'],
        app.config['RECAPTCHA_PRIVATE_KEY'],
        request.remote_addr)
    return response.is_valid

@app.template_filter('datetime')
def _jinja2_filter_datetime(ts):
    return time.strftime('%b %d, %Y %I:%M %p', time.localtime(ts))


@app.errorhandler(404)
def page_not_found(e):
    return render_template('errors/404.html'), 404


@app.errorhandler(500)
def page_error(e):
    logging.exception(e)
    return render_template('errors/500.html'), 500


@app.route("/")
def root():
    return render('home')
    #return redirect('/home')


@app.route("/account/")
def account():
    return render_template('account/index.html')


@app.route("/_new/", methods=['GET', 'POST'])
def new_wiki():
    if request.method == 'POST':
        # TODO validate wiki name
        wiki_name = request.form['name']
        s = Site()
        if s.get_by_name(wiki_name):
            flash("Site already exists")
            return redirect(redirect_url())
        else:
            Wiki(repo_dir + "/" + wiki_name)
            return redirect('http://%s.%s' % (wiki_name, config.hostname))
    else:
        return render_template('_new/index.html')


@app.route("/logout/")
def logout():
    logout_user()
    del session['user']
    return redirect(url_for('root'))

@app.route("/commit/<sha>/<name>")
def commit_sha(name, sha):
    cname = to_canonical(name)

    data = w.get_page(cname, sha=sha)
    if data:
        return render_template('page/page.html', page=data)
    else:
        return redirect('/create/'+cname)


@app.route("/compare/<name>/<regex('[^.]+'):fsha><regex('\.{2,3}'):dots><regex('.+'):lsha>")
def compare(name, fsha, dots, lsha):
    diff = w.compare(name, fsha, lsha)
    return render_template('page/compare.html', name=name, diff=diff)


@app.route("/register", methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        user = User()
        if user.get_by_email(request.form['email']):
            flash('Email is already taken')
            return redirect('/register')
        if user.get_by_username(request.form['username']):
            flash('Username is already taken')
            return redirect('/register')

        email = request.form['email'].lower()
        # Create user and login
        u = User.create(email=email,
                        username=request.form['username'],
                        password=bcrypt.generate_password_hash(request.form['password']),
                        avatar=gravatar_url(email))
        login_user(CurrentUser(u.id))
        return redirect("/")
    else:
        return render_template('account/register.html')


@app.route("/login", methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        if User.auth(request.form['email'], request.form['password']):
            return redirect("/")
        else:
            flash("Email or Password invalid")
            return redirect("/login")
    else:
        return render_template('account/login.html')


@app.route("/history/<name>")
def history(name):
    history = w.get_history(name)
    return render_template('page/history.html', name=name, history=history)


@app.route("/edit/<name>", methods=['GET', 'POST'])
def edit(name):
    data = w.get_page(name)
    cname = to_canonical(name)
    if request.method == 'POST':
        edit_cname = to_canonical(request.form['name'])
        if edit_cname != cname:
            w.rename_page(cname, edit_cname)
        w.write_page(edit_cname, request.form['content'], message=request.form['message'])
        return redirect("/" + edit_cname)
    else:
        if data:
            name = remove_ext(data['name'])
            content = data['data']
            return render_template('page/edit.html', name=name, content=content)
        else:
            return redirect('/create/'+cname)


@app.route("/delete/<name>", methods=['POST'])
def delete(name):
    pass


@app.route("/create/", methods=['GET', 'POST'])
@app.route("/create/<name>", methods=['GET', 'POST'])
def create(name=None):
    cname = ""
    if name:
        cname = to_canonical(name)
        if w.get_page(cname):
            # Page exists, edit instead
            return redirect("/edit/" + cname)
    if request.method == 'POST':
        w.write_page(request.form['name'], request.form['content'],  message=request.form['message'], create=True)
        return redirect("/" + cname)
    else:
        return render_template('page/edit.html', name=cname, content="")


@app.route("/<name>")
def render(name):
    cname = to_canonical(name)
    if cname != name:
        return redirect('/' + cname)

    data = w.get_page(cname)
    if data:
        return render_template('page/page.html', name=cname, page=data)
    else:
        return redirect('/create/'+cname)

import ratelimit