from flask import Flask,render_template,session,redirect,url_for,flash
from flask_script import Manager
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from datetime import datetime
from flask_wtf import Form
from wtforms import StringField,SubmitField
from wtforms.validators import  Required
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_mail import Mail,Message
from threading import Thread
import os

basedir = os.path.abspath(os.path.dirname(__file__))
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir,'data.sqlite')
app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True
app.config['SECRET_KEY'] = 'very easy to guess!'

app.config['MAIL_SERVER'] = 'smtp.qq.com'
app.config['MAIL_PORT'] = 465
app.config['MAIL_USE_SSL'] = True
app.config['MAIL_USERNAME'] = os.environ.get("MAIL_USERNAME")
app.config['MAIL_PASSWORD'] = os.environ.get("MAIL_PASSWORD")
app.config['FLASKY_MAIL_SUBJECT_PREFIX'] = '[Flasky]'
app.config['FLASKY_MAIL_SENDER'] = 'Flasky Admin <<EMAIL>>'
app.config['FLASK_ADMIN'] = os.environ.get("FLASK_ADMIN")

mail = Mail(app)
db = SQLAlchemy(app)
migrate = Migrate(app,db)
manager = Manager(app)
bootstrap = Bootstrap(app)
moment = Moment(app)

class NameForm(Form):
    name = StringField('what your name?',validators=[Required()])
    submit = SubmitField('submit')

class Role(db.Model):
    __tablename__ = 'roles'
    id = db.Column(db.Integer,primary_key=True)
    name = db.Column(db.String(64),unique=True)
    users = db.relationship('User',backref='role',lazy='dynamic')

    def __repr__(self):
        return '<Role %r>'%self.name

class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer,primary_key=True)
    username = db.Column(db.String(64),unique=True,index=True)
    role_id = db.Column(db.Integer,db.ForeignKey('roles.id'))

    def __repr__(self):
        return '<User %r>'%self.username

def send_asnyc_email(app,msg):
    with app.app_context():
        mail.send(msg)

def send_email(to,subject,template,**kwargs):
    msg = Message(app.config['FLASKY_MAIL_SUBJECT_PREFIX']+subject,
                    sender=app.config['FLASKY_MAIL_SENDER'],recipients=[to])
    msg.body = render_template(template + '.txt',**kwargs)
    msg.html = render_template(template + '.html',**kwargs)
    thr = Thread(target=send_asnyc_email,args=(app,msg))
    thr.start()
    return thr

@app.shell_context_processor
def make_shell_context():
    return dict(db=db,User=User,Role=Role)

@app.route('/',methods=["GET","POST"])
def index():
    form = NameForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.name.data).first()
        if user is None:
            user = User(username=form.name.data)
            db.session.add(user)
            db.session.commit()
            session['known'] = False
            if app.config['FLASK_ADMIN']:
                send_email(app.config['FLASK_ADMIN'],'New User','mail/new_user',user=user)
        else:
            session['known'] = True
        session['name'] = form.name.data
        form.name.data = ''
        return redirect(url_for('index'))
    return render_template("index.html",current_time=datetime.utcnow(),form=form,name=session.get('name'),
                            known=session.get('known',False))

@app.route('/user/<name>')
def user(name):
    #return "<h1>Hello,%s!</h1>"%name
    return render_template('user.html',name=name)

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'),404

if __name__ == '__main__':
    manager.run()