'''
Created on 2021-01-08

This is a demo application for https://github.com/WolfgangFahl/pyFlaskBootstrap4

@author: wf
'''
from fb4.app import AppWrap
from flask import render_template

class HelloWeb(AppWrap):
    '''
    a sample web application
    '''

    def __init__(self):
        '''
        Constructor
        '''
        super().__init__()
        
    def home(self):
        '''
        render the home page of the HelloWeb application
        '''
        html = render_template("bootstrap.html", title="HelloWeb demo application",content="Welcome to the Flask + Bootstrap4 Demo web application",error=None)
        return html
    
helloWeb=HelloWeb()
app=helloWeb.app 
@app.route('/')
def home():
    return helloWeb.home()

if __name__ == '__main__':
    parser=helloWeb.getParser("Flask + Bootstrap4 Demo Web Application")
    args=parser.parse_args()
    helloWeb.optionalDebug(args)
    helloWeb.run(args)

...
        @app.route('/events')
        def test_events():
            return self.eventExample()
        
        @app.route('/eventfeed')
        def test_eventFeed():
            return self.eventFeed()
        
        @app.route('/progressfeed')
        def test_progressFeed():
            return self.progressFeed()
...
    def getTimeEvent(self):
        '''
        get the next time stamp
        '''
        time.sleep(1.0)
        s=datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S')
        return s    
    
    def progressFeed(self):
        '''
        feed progress info as json 
        '''
        self.pc=0
        def progress():
            time.sleep(0.5)
            self.pc=(self.pc+5) % 100
            pcdict={"progress":self.pc}
            return json.dumps(pcdict)
            
        sse=self.sseBluePrint
        return sse.streamFunc(progress) 
    
    def eventFeed(self):
        '''
        create a Server Sent Event Feed
        '''
        sse=self.sseBluePrint
        # stream from the given function
        return sse.streamFunc(self.getTimeEvent)
                
    def eventExample(self):
        return render_template("event.html")