#!/usr/bin/env python3
"""
Database tools and functions.
"""
import string
import urllib
import functools

import bleach
from flask import session, request, abort, redirect, url_for, render_template
from flask import Blueprint

import database as db

views = Blueprint("views", __name__)

def login_required(url=None):
	"""
	A decorator function to protect certain endpoints by requiring the user
	to either pass a valid session cookie, or pass thier username and
	password along with the request to login.
	"""
	def actual_decorator(func):
		@functools.wraps(func)
		def _nop(*args, **kwargs):
			username = session.get("username")
			if db.verify_username(username):
				return func(*args, **kwargs)

			username = request.form.get("user")
			password = request.form.get("pass")
			if db.verify_password(username, password):
				return func(*args, **kwargs)

			if url:
				return redirect(url_for(url))
			else:
				abort(401)
		return _nop 
	return actual_decorator


def sanitize_title(canon_title):
	"""
	Sanitizes the given canonical title for a quest and returns a
	url-friendly version.
	"""
	ident_title = canon_title.lower().replace(" ", "-")
	ident_title = urllib.parse.quote(ident_title)
	return ident_title


@views.route("/quest/<path:quest_title>")
def quest(quest_title):
	"""
	An arbituary quest page.
	"""
	quest_title, _, extra = quest_title.partition("/")
	res = db._DB.execute("SELECT * FROM `quests` WHERE `ident_title` = %s",
		(quest_title,))
	data = res.fetchone()
	if not data:
		abort(404)
	quest_id, quest_title, _, owner_id, quest_data = data

	messages = db.get_chat_messages(quest_id)
	return render_template('quest.html',
		quest_title=quest_title,
		quest_body=quest_data,
		room_id=quest_id,
		messages=messages)


@views.route("/create_quest", methods=["GET", "POST"])
@login_required("login")
def create_quest():
	"""
	Starts a new quest.
	"""
	if request.method == "GET":
		return render_template("create_quest.html")
	canon_title = request.form.get("quest_title")
	quest_body = request.form.get("quest_body")

	ident_title = sanitize_title(canon_title)
	quest_body = bleach.clean(quest_body.strip())
	quest_body = quest_body.replace("\n", "<br />")

	db._DB.execute(
		"INSERT INTO `quests` (`canon_title`, `ident_title`, `quest_data`) " \
		"VALUES (%s, %s, %s)", (canon_title, ident_title, quest_body))
	return redirect(url_for('views.quest', quest_title=ident_title))


@views.route("/login", methods=["GET", "POST"])
def login():
	"""
	Logs the user in.
	"""
	if request.method == "GET":
		return render_template("login.html")

	username = request.form.get("user")
	password = request.form.get("pass")

	if db.verify_password(username, password):
		session["username"] = username
		return redirect(url_for("views.index"))
	else:
		abort(401)


@views.route("/signup", methods=["GET", "POST"])
def signup():
	"""
	Create a new account.
	"""
	if request.method == "GET":
		return render_template("signup.html")

	username = request.form.get("user")
	password = request.form.get("pass")
	password_verify = request.form.get("pass_verify")

	if len(username) > 20:
		"username_too_long"
	elif len(username) < 3:
		"username_too_short"
	chrs = [c not in string.ascii_letters + string.digits for c in username]
	if any(chrs):
		"username_bad_chars"
	if db.verify_username(username):
		"username_taken"
	
	if len(password) > 1024:
		"password_too_long"
	elif len(password) < 8:
		"password_too_short"
	
	if password != password_verify:
		"passwords_dont_match"

	res = db.add_user(username, password)
	return redirect(url_for("views.index"))


@views.route("/")
def index():
	"""
	The index page.
	"""
	return render_template("index.html")