import random
import operator
import json
import datetime
from functools import wraps
from flask import Flask, Response, redirect, url_for, request, session, abort, render_template
from flask_login import LoginManager
import sqlalchemy
from sqlalchemy.sql import select, text
from dateutil.parser import parse
app = Flask(__name__)

#config
app.config.update(
   DEBUG = True,
   SECRET_KEY = 'secret_xxx',
   SESSION_TYPE = 'memcached'
)

db_engine = {}
db_metadata = {}
meals = {}

def connect(user, password, db, host='localhost', port=5432):
	url = 'postgresql://{}:{}@{}:{}/{}'
	url = url.format(user, password, host, port, db)
	con = sqlalchemy.create_engine(url, client_encoding='utf8')
	meta = sqlalchemy.MetaData(bind=con, reflect=True)
	return con, meta

def check_auth(username, password):
	query = "select id, password from users where username=:usrnm;"
	r = db_engine.execute(text(query), usrnm=username)
	results = []
	for row in r:
		results.append(dict(row))
	r.close()
	if len(results)!=1:
		return False;

	#TODO: REMOVE TEMPORARY PASSWORD OVERRIDE VECTOR 1==1.
	if results[0]['password']==password or 1==1:
		session['uid'] = results[0]['id']
		print (session['uid'])
		return True
	else:
		return False

def authenticate():
	return Response('Could not verify access level. Please retry', 401, {'WWW-Authenticate' :  'Basic realm="Login Required"'})

def requires_auth(f):
	@wraps(f)
	def decorated(*args, **kwargs):
		auth = request.authorization
		if not auth or not check_auth(auth.username, auth.password):
			return authenticate()
		return f(*args, **kwargs)
	return decorated

def getLeaderboard():
	s = 'select u.username as name, u.score as score, max(m.meal_date) as last_meal from users as u left join meals as m on m.kuk = u.id group by u.id order by score, last_meal;'
	r = db_engine.execute(text(s))
	leaders=[]
	for row in r:
		leaders.append(dict(row))
	r.close()
	return leaders

def getUpcomingMeals():
	# meals = []
	# meals.append({'id':1, 'kuk':'davide', 'eaters':['marek','sven','wille'], 'flavor_text':'Pizza', 'date':'Tuesday 21st of November', 'selection_deadline':'23 hours 14 minutes', 'status':0})
	# meals.append({'id':2, 'kuk':'marek', 'eaters':['davide','sven','david', 'wille'], 'flavor_text':'Grzybowa', 'date':'Friday 23rd of November', 'selection_deadline':'3 Days 23 hours', 'status':0})
	# meals.append({'id':2, 'kuk':'marek', 'eaters':['davide','sven','david', 'wille'], 'flavor_text':'Grzybowa', 'date':'Friday 23rd of November', 'selection_deadline':'3 Days 23 hours', 'status':0})
	# meals.append({'id':2, 'kuk':'marek', 'eaters':['davide','sven','david', 'wille'], 'flavor_text':'Grzybowa', 'date':'Sunday 25rd of November', 'selection_deadline':'3 Days 23 hours', 'status':0})
	# meals.append({'id':2, 'kuk':'marek', 'eaters':['davide','sven','david', 'wille'], 'flavor_text':'Grzybowa', 'date':'Sunday 25rd of November', 'selection_deadline':'3 Days 23 hours', 'status':0})
	# meals.append({'id':2, 'kuk':'marek', 'eaters':['davide','sven','david', 'wille'], 'flavor_text':'Grzybowa', 'date':'Monday 26rd of November', 'selection_deadline':'3 Days 23 hours', 'status':0})
	query = 'select username as kuk, meal_date, array_agg as eaters, selection_deadline from (select kuk, meal_date, selection_deadline, array_agg(username) from meals join users on users.id = any(meals.eaters) where meals.status=0 group by meals.id order by meal_date) as foo join users on kuk=users.id;'
	r = db_engine.execute(text(query))
	meals = []
	for row in r:
		meals.append(dict(row))
		seconds_to_deadline = (meals[-1]['selection_deadline'] - datetime.datetime.now()).total_seconds()
		if seconds_to_deadline < 0:
			meals[-1]['selection_deadline'] = 'Deadline passed'
		elif seconds_to_deadline > 3600:
			hours_td = round(seconds_to_deadline / 3600)
			days_td = int(hours_td / 24)
			hours_td = hours_td % 24
			meals[-1]['selection_deadline'] = str(days_td) + ' days ' + str(hours_td) + ' hours'
		else:
			meals[-1]['selection_deadline'] = str(round(seconds_to_deadline / 60)) + ' minutes'
		meals[-1]['meal_time'] = meals[-1]['meal_date'].strftime('%H:%M')
		meals[-1]['meal_date'] = meals[-1]['meal_date'].strftime('%A %d %B')
	r.close()
	return meals

# adding to meal
@app.route("/addme")
@requires_auth
def addme():
	meal_id = request.args.get('meal')
	query = 'select :user_id = any (eaters) from meals where id =:meal_id;'
	r = db_engine.execute(text(query), user_id=session['uid'], meal_id = meal_id)
	results = []
	for row in r:
		results.append(dict(row))
	
	if 1==1:
		return render_template('appresponse.html', message='Have a nice meal ' + meal_id + " mister " + str(session['uid']) )
	else:
		return render_template('appresponse.html', message='Only one meal per person!')

@app.route('/')
def index():
	print (getUpcomingMeals())
	return render_template('meal_list.html', leaderboard=getLeaderboard(), meals=getUpcomingMeals(), current_user_name='Wille')

with open('admin.json') as f:
	postgres_credentials = json.load(f)
	db_engine, db_metadata = connect(postgres_credentials['username'], postgres_credentials['password'], 'kuk_app')
	meals = sqlalchemy.Table('meals', db_metadata)

if __name__ == '__main__':
	app.run('0.0.0.0')