#!/usr/bin/env python3
"""
Database tools and functions.
"""
import time
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
import tools

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


@views.route("/quest/<path:quest_title>")
def quest(quest_title):
	"""
	An arbituary quest page.
	"""
	ident_title, _, extra = quest_title.partition("/")
	data = db.get_quest_meta(ident_title=ident_title)
	if not data:
		abort(404)
	quest_id = data[0]
	quest_title = data[1]
	owner_id = data[3]
	quest_posts = db.get_quest_data(quest_id)
	messages = db.get_chat_messages(quest_id)
	return render_template('quest.html',
		quest_title=quest_title,
		ident_title=ident_title,
		quest_posts=quest_posts,
		owner_id=owner_id,
		room_id=quest_id,
		messages=messages)


@views.route("/profile/<path:username>")
def profile(username):
	"""
	Shows the profile page of the specified user.
	"""
	data = db.get_user_info(username)
	if not data:
		return "user_not_found"
	user_id, signup_date = data
	quests = db.get_user_quests(user_id)
	return render_template("profile.html",
		username=username,
		signup_date=signup_date,
		num_quests=len(quests))


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

	owner_id = session.get("user_id")
	timestamp = int(time.time())

	quest_id = db.insert_quest(canon_title, ident_title, owner_id)
	db.insert_quest_post(quest_id, quest_body, timestamp)

	return redirect(url_for('.quest', quest_title=ident_title))


@views.route("/quest/<path:quest_title>/edit_quest", methods=["GET", "POST"])
def edit_quest(quest_title):
	"""
	Allows the quest owner to edit the quest.
	"""
	ident_title = quest_title
	data = db.get_quest_meta(ident_title=ident_title)
	if not data:
		abort(404)
	quest_id = data[0]
	quest_title = data[1]
	if request.method == "GET":
		return render_template("edit_quest.html",
			quest_title=quest_title,
			ident_title=ident_title)
	return redirect(url_for(".quest", quest_title=ident_title))


@views.route("/set_session")
def set_session():
	"""
	Allows certain session values to be set by the client.
	"""
	hide_header = request.args.get("hide_header")
	if hide_header == "on":
		session["hide_header"] = True
	elif hide_header == "off":
		session["hide_header"] = False
	return ""


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

	timestamp = int(time.time())
	res = db.add_user(username, password, timestamp)
	return redirect(url_for(".index"))


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