# Python standard libraries
import json
import os

# Third-party libraries
import flask
from flask import render_template, flash
from flask import Flask, redirect, request, url_for, jsonify
from flask_login import (
    LoginManager,
    current_user,
    login_required,
    login_user,
    logout_user,
)
from random_words import RandomWords
import requests

import server.googleHandler as google

from server import login_manager, app, db
from server.forms import LoginForm, RegistrationForm, DeviceForm
import backend
from database.models import User, Calendar, Device, GoogleToken

os.environ['OAUTHLIB_INSECURE_TRANSPORT'] = '1'

@app.route("/")
def startpage():
    return flask.render_template('startpage.html')

    

@app.route("/privacy")
def privacy():
    return flask.render_template('privacy.html')

@app.route("/login")
def login():
    if current_user.is_authenticated:
        return redirect(url_for('account'))
    return flask.render_template('login.html')


@app.route("/account")
def account():
    if current_user.is_authenticated:
        calendars = []
        gCalendars, colors, token = google.fetchCalendars()
        if token != None:
            current_user.google_token.token = token
            db.session.commit()
        calendars.extend(gCalendars)
        backend.updateCalendars(current_user, calendars, colors)
        
        return (flask.render_template('account.html',
            username = current_user.username, email = current_user.email, profile_img=current_user.profile_pic
            )
        )
    else:
        return redirect(url_for("login"))

@app.route("/view")
def view():
    if not current_user.is_authenticated:
        return flask.render_template('login.html')
    else:
        return (flask.render_template('view.html'))

@app.route("/devices", methods=['GET', 'POST'])
def devices():
    if not current_user.is_authenticated:
        return flask.render_template('login.html')

    # if this is a post request from the 'unlink' submittion form
    # delete this device from the list
    form = DeviceForm()
    if request.method == 'POST':

        if request.form.get("submit") == "Unlink":
            device = db.session.query(Device).filter(Device.deviceName==request.form.get("device")).first()
            db.session.delete(device)
            db.session.commit()

    # if this is part of the device form
        elif form.validate_on_submit():
            device = db.session.query(Device).filter(Device.deviceName==form.deviceName.data).first()
            current_user.devices.append(device)
            db.session.commit()

    return flask.render_template('devices.html', 
            devices=current_user.devices,
            form=form)


@app.route("/calendar")
@login_required
def calendar():
    calendars = backend.calendarsFromDb(current_user)
    return flask.render_template('calendar.html', calendars=calendars)

@app.route('/login/email', methods=['GET', 'POST'])
def emaillogin():
    if current_user.is_authenticated:
        return redirect(url_for('account')      )
    form = LoginForm()

    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.checkPassword(form.password.data):
            flash('invalid username or password')
            return redirect(url_for('emaillogin'))
        login_user(user, remember=form.remember_me.data)
        return redirect(url_for('account'))
    return render_template('emaillogin.html', title='Sign In', form=form)


@app.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('account'))



    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(userid=form.username.data,
                    username=form.username.data, 
                    email=form.email.data)
        user.setPassword(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('Congratulations, you are now a registered user!')
        return redirect(url_for('emaillogin'))
    return flask.render_template('register.html', title='Register', form=form)

@app.route("/delete_account")
def deleteAccount():
    if not current_user.is_authenticated:
        return redirect(url_for('account'))
    if current_user.google_token != None:
        google.deleteAccount(current_user)
    
    db.session.delete(current_user)
    db.session.commit()
    logout_user()

    return redirect(url_for('account'))

@app.route("/login/google")
def googlelogin():
    if current_user.is_authenticated and current_user.google_token != None:
        return redirect(url_for('account'))

    authorization_url = google.login()

    return flask.redirect(authorization_url)

@app.route("/login/google/callback")
def callback():
    session, credentials = google.verifyResponse()
    userinfo = session.get('https://www.googleapis.com/userinfo/v2/me').json()
    
    # Create a user in your db with the information provided
    # by Google

    # Doesn't exist? Add it to the database.
    if not db.session.query(User).filter(User.userid==userinfo['id']).first():
        gc = GoogleToken(token=credentials.get("token"),
                               refresh_token=credentials.get("refresh_token"))
        db.session.add(gc)
        newser = User(
         
            userid=userinfo['id'], 
            username=userinfo['name'], 
            email=userinfo['email'], 
            profile_pic=userinfo['picture'],
            password_hash="",
            google_token = gc
        )   
        db.session.add(newser)
        db.session.commit()

    user = db.session.query(User).filter(User.userid==userinfo['id']).first()

    # Begin user session by logging the user in
    login_user(user)
    
    return flask.redirect(flask.url_for('account'))

@app.route("/logout")
@login_required
def logout():
    logout_user()
    return redirect(url_for("startpage"))


@app.route("/device/<path:device>/calendarevents.json")
def downloader(device):
    path = "/home/calendarwatch/device/" + device + "/"
    request_device = db.session.query(Device).filter(Device.deviceName==device).first()
    if request_device == None: 
        return jsonify(kind="not found")
    if request_device.user_id == None: 
        return jsonify(kind="unregistered")

    request_device.connection=True
    db.session.commit()
    request_user = db.session.query(User).filter(User.id==request_device.user_id).first()

    # TODO add test if googke token exists
    # if request_user.google_token != Null:
    # TODO only pass along google calendars form user
    startDate, endDate = backend.getTimeStamps()
    events, colors  = google.fetchCalendarEvents(request_user, request_user.calendars, startDate, endDate)
    calendarjson = backend.generateJsonFromCalendarEntries(events, colors) 
    return jsonify(calendarjson)

@app.route("/devicefingerprint.json")
def generateDeviceFingerprint():
    # Create Three Random Words
    r = RandomWords()
    while True:
        fingerprint = ""
        length = 3
        randos = r.random_words(count=length)
        for i in range(len(randos)):
            fingerprint += randos[i] 
            if i < length-1:
                fingerprint += "-"

        # check not in Device Database
        if not db.session.query(Device).filter(Device.deviceName==fingerprint).first():
            # Save as new Device
            device = Device(deviceName=fingerprint, connection=False)
            db.session.add(device)
            db.session.commit()
            break;
        
    # Send to Device
    return jsonify(deviceName=fingerprint)

# POST

@app.route('/calendar', methods = ['POST', 'DELETE'])
@login_required
def user():
    if request.method == 'POST':
        calId = request.json.get('calendar_id')
        color = request.json.get('color', None)
        toggle = request.json.get('toggle', None)
        
        if color != None:
            current_user.updateCalendar(calId, color=color)
        if toggle != None:
            current_user.updateCalendar(calId, toggle=toggle)
        # toggle specific calendar of user
        
    elif request.method == 'DELETE':
        # do nothing
        return 'NONE'
    else:
        # POST Error 405
        print("405")

    return 'OK'