#!/usr/bin/env python3.6
from flask import make_response
from flask import render_template, url_for, redirect, request
from flask_login import login_user, login_required, current_user, logout_user
from werkzeug.exceptions import HTTPException
from werkzeug.security import generate_password_hash, check_password_hash
import hashlib
import datetime
import time

import fetchDUALIS
import fetchRAPLA
import requesthelpers
from fetchRAPLA import *
from calendar_generation import getWeek
from init import *


@app.route("/")
def index():
    """
    Leitet den normalen Website-Aufruf zum Login weiter.
    :return HTML:
    """
    return redirect(url_for("login"))


@app.route("/welcome")
@login_required
def welcome():
    """
    Interim Homepage
    :return HTML:
    """
    kurs = current_user.kurs
    name = current_user.name
    return render_template('index.html', headermessage='DualHub', message="Hallo, "
                                                                          + name + " (" + kurs + ")")


@app.route("/backendpoc/noten")
@login_required
def displayNoten():
    """
    Zeigt die Noten aus Dualis an. Hierfür ist ein aktives Token nötig.
    :return HTML:
    """
    d = Dualis.query.filter_by(uid=current_user.id).first()
    t = d.token
    sem = d.result_list
    c = request.cookies.get("cnsc")
    timeout = fetchDUALIS.timeOut(d, c, "displayNoten")
    if timeout:
        return timeout
    res = fetchDUALIS.getResults(t, c, sem)
    return render_template("noten.html", noten=res, semester=fetchDUALIS.getSem(t, c), sel=sem)


@app.route("/backendpoc/plan", methods=["GET"])
@login_required
def displayRapla():
    """
    Zeigt den Stundenplan für eingeloggte User an. \n
    TODO: Persönliche Filter, Notizen, Essensvorlieben etc. berücksichtigen.
    :return HTML:
    """
    week = request.args.get("week")
    if week:
        week = datetime.datetime.strptime(week, "%Y-%m-%d")
    else:
        week = "today"
    samstag = request.args.get("samstag")
    if not samstag:
        samstag = False
    events = getWeek(week, fetchRAPLA.getIcal(current_user.kurs), samstag)
    return render_template("plan.html", events=events[0], eventdays=events[1])


@app.route("/backendpoc/plan/<string:kurs>")
def displayPlan(kurs):
    """
    Zeigt den Stundenplan ohne Login an. \n
    Präferenzen werden nicht berücksichtigt.
    :param kurs:
    :return HTML:
    """
    week = request.args.get("week")
    if week:
        week = datetime.datetime.strptime(week, "%Y-%m-%d")
    else:
        week = "today"
    try:
        if current_user.kurs == kurs.upper():
            return redirect(url_for("displayRapla"))
    except AttributeError:
        pass
    plan = fetchRAPLA.getIcal(kurs.upper())
    if plan:
        samstag = request.args.get("samstag")
        if not samstag:
            samstag = False
        events = getWeek(week, plan, samstag)
        return render_template("plan-anon.html", events=events[0], eventdays=events[1])
    else:
        return redirect(url_for("login"))


@app.route("/backendpoc/set-up")
def redKurs():
    """
    Setup beginnt mit Kurs.
    :return HTML:
    """
    return redirect(url_for("getKurs"))


@app.route("/backendpoc/set-up/kurs")
@login_required
def getKurs():
    """
    Automatische Kurs-Auswahl. \n
    Aktives Dualis-Token benötigt.
    :return HTML:
    """
    d = Dualis.query.filter_by(uid=current_user.id).first()
    if d:
        cookie = request.cookies.get("cnsc")
        timeout = fetchDUALIS.timeOut(d, cookie, "getKurs")
        if timeout:
            return timeout
        e = False
        if not current_user.kurs:
            kurs = fetchDUALIS.getKurs(d.token, cookie)
            if kurs != 0:
                current_user.kurs = kurs
                db.session.commit()
            else:
                e = True
        else:
            kurs = current_user.kurs
            current_user.kurs = kurs
            db.session.commit()
    else:
        e = True
        kurs = ""
    return render_template('kurs.html', detected=(kurs, e))


@app.route("/backendpoc/set-up/semester")
@login_required
def getSemester():
    """
    Manuelle Semester-Auswahl.
    :return HTML:
    """
    t = Dualis.query.filter_by(uid=current_user.id).first().token
    c = request.cookies.get("cnsc")

    return render_template("semester.html", semester=fetchDUALIS.getSem(t, c))


@app.route("/backendpoc/set-up/semester", methods=["POST"])
@login_required
def setSemester():
    """
    Speichern der Semester-Auswahl.
    :return HTML:
    """
    n = request.args.get("next")
    if not n:
        n = url_for("welcome")
    d = Dualis.query.filter_by(uid=current_user.id).first()
    d.result_list = request.form.get("sem")
    db.session.commit()
    return redirect(n)


@app.route("/backendpoc/set-up/rapla")
@login_required
def chooseRaplas():
    """
    Manuelle Rapla-Auswahl.
    :return HTML:
    """
    r = getRaplas()
    return render_template("rapla.html", raplas=r)


@app.route("/backendpoc/set-up/rapla", methods=["POST"])
@login_required
def getRapla():
    """
    Verarbeitet die Eingabe von chooseRaplas().
    :return HTML:
    """
    file = str(request.form.get("file"))
    url = str(request.form.get("url"))
    if file == url == "None":
        return redirect(url_for("chooseRaplas"))
    if file != "None":
        User.query.filter_by(id=current_user.id).first().kurs = file[5:-5]
        db.session.commit()
    elif url != "None":
        file = getNewRapla(url)
        if type(file) is not int:
            User.query.filter_by(id=current_user.id).first().kurs = file[5:-5]
            db.session.commit()
        else:
            return redirect(url_for("error", ecode=file + 900))
    return redirect(url_for("welcome"))


@app.route("/backendpoc/log-in")
def login():
    """
    Login-Maske.
    :return HTML:
    """
    return render_template("login.html")


@app.route("/backendpoc/log-in", methods=["POST"])
def login_post():
    """
    Verarbeitet die Eingabe von login(). \n
    Falls der User schon angelegt ist, wird das Passwort verglichen. \n
    Falls nicht, wird ein neuer angelegt.
    :return HTML:
    """
    email = request.form.get("email")
    password = request.form.get("password")
    n = request.args.get("next")
    if n:
        success = make_response(redirect(n))
    else:
        success = make_response(redirect(url_for("getKurs")))

    user = User.query.filter_by(email=email).first()
    newcookie = ""
    if user:
        dualis = Dualis.query.filter_by(uid=user.id).first()
        if check_password_hash(user.password, password):
            cookie = request.cookies.get("cnsc")
            if not dualis.token or not fetchDUALIS.checkLifetime(dualis.token_created) or not cookie:
                new_token = fetchDUALIS.checkUser(email, password)
                dualis.token = new_token[0]
                newcookie = requesthelpers.getCookie(new_token[1].cookies)
                dualis.token_created = time.time()
                db.session.commit()
        else:
            t = fetchDUALIS.checkUser(email, password)
            if t[0] == -2:
                return redirect(url_for("login", code=-2))
            else:
                user.password = generate_password_hash(password, method="pbkdf2:sha256")
                dualis.token = t[0]
                newcookie = requesthelpers.getCookie(t[1].cookies)
                dualis.token_created = time.time()
                db.session.commit()
        login_user(user)
        if user.kurs:
            if not n:
                success = make_response(redirect(url_for("welcome")))
            success.set_cookie("cnsc", value=newcookie, httponly=True, secure=True)
        return success

    t = fetchDUALIS.checkUser(email, password)
    if t[0] == -2:
        return redirect(url_for("login", code=-2))

    hashid = int(hashlib.sha1(email.encode("utf-8")).hexdigest(), 16) % (10 ** 8)
    hashpw = generate_password_hash(password, method="pbkdf2:sha256")
    pname = email.find(".") + 1
    ename = min(email[pname:].find("."), email[pname:].find("@"))
    name = email[pname:pname + ename].capitalize()
    new_user = User(email=email, password=hashpw, name=name, id=hashid)
    db.session.add(new_user)

    cookie = requesthelpers.getCookie(t[1].cookies)

    new_dualis = Dualis(uid=hashid, token=t[0], token_created=int(time.time()))
    db.session.add(new_dualis)
    db.session.commit()
    login_user(new_user)
    newcookie = cookie
    success.set_cookie("cnsc", value=newcookie, httponly=True, secure=True)
    return success


@app.route("/backendpoc/log-out")
@login_required
def logout():
    """
    Loggt den User aus.
    :return Empty Token:
    """
    cookie = request.cookies.get("cnsc")
    dualis = Dualis.query.filter_by(uid=current_user.id).first()
    fetchDUALIS.logOut(dualis.token, cookie)
    dualis.token = None
    db.session.commit()
    logout_user()
    red = make_response(redirect(url_for("login", code=1, next=url_for("welcome"))))
    red.set_cookie("cnsc", value="Logged out! Your temporary token "
                                 "on our server and the cookie on your device have been deleted.", httponly=True,
                   secure=True)
    return red


@app.route("/backendpoc/error<int:ecode>")
def error(ecode):
    """
    Error Page für custom-Errors. \n
    TODO: Funktion depreciaten. Ersetzen durch Errors auf den entsprechenden Seiten.
    :param ecode:
    :return:
    """
    if ecode == 900:
        msg = "Ungültige RAPLA-URL! Sicher, dass der Link zum DHBW-Rapla führt?"
    elif ecode == 899:
        msg = "Der Kalender wurde nicht gefunden! Sicher, dass der Link korrekt ist?"
    else:
        msg = "Unbekannter Fehler!"
    return render_template('index.html', message=msg, headermessage="DualHub")


@app.errorhandler(HTTPException)
def handle(e):
    """"
    HTTP-Exception-Handler
    """
    return render_template('index.html', message=e, headermessage="DualHub")


if __name__ == "__main__":
    app.run(host='0.0.0.0', port=2024, debug=True)