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

basedir =os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SECRET_KEY'] = '695c713e-d8c0-4df2-be4a-b29cfa910a73'
app.config['SQLALCHEMY_DATABASE_URI'] ="mysql+pymysql://root:passw0rd@localhost/flasky?charset=UTF8MB4"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['MAIL_SERVER'] ='smtp.163.com'
app.config['MAIL_PORT'] = 465
app.config['MAIL_USE_SSL'] = True
#app.config['MAIL_USERNAME'] = 'dongf9527@163.com'
#app.config['MAIL_PASSWORD'] = 'Godsaveme04'
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<flasky@example.com>'
app.config['FLASKY_MAIL_SENDER']='dongf9527@163.com'
#收件人可设置为其他邮箱
app.config['FLASKY_ADMIN'] ='dongf952702@163.com'

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

def send_async_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_async_email, args=[app,msg])
    thr.start()
    return thr
    
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

class NameForm(FlaskForm):
    name=StringField('What is your name?', validators=[DataRequired() ])
    submit =SubmitField('Submit')

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

@app.route('/user/<name>')
def user(name):
    return render_template('user.html',name=name)

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

@app.errorhandler(500)
def internal_server_error(e):
    return render_template('500.html'),500

@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['FLASKY_ADMIN']:
                send_email(app.config['FLASKY_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', form=form, name=session.get('name'),
        known=session.get('known', False))