import machine
from microdot import Microdot, redirect, send_file

app = Microdot()


@app.route('/', methods=['GET', 'POST'])
def index(request):
    form_cookie = None
    message_cookie = None
    if request.method == 'POST':
        form_cookie = '{pin},{pull}'.format(pin=request.form['pin'],
                                            pull=request.form['pull'])
        if 'read' in request.form:
            pull = None
            if request.form['pull'] == 'pullup':
                pull = machine.Pin.PULL_UP
            elif request.form['pull'] == 'pulldown':
                pull = machine.Pin.PULL_DOWN
            pin = machine.Pin(int(request.form['pin']), machine.Pin.IN, pull)
            message_cookie = 'Input pin {pin} is {state}.'.format(
                pin=request.form['pin'],
                state='high' if pin.value() else 'low')
        else:
            pin = machine.Pin(int(request.form['pin']), machine.Pin.OUT)
            value = 0 if 'set-low' in request.form else 1
            pin.value(value)
            message_cookie = 'Output pin {pin} is now {state}.'.format(
                pin=request.form['pin'],
                state='high' if value else 'low')
        response = redirect('/')
    else:
        if 'message' not in request.cookies:
            message_cookie = 'Select a pin and an operation below.'
        response = send_file('gpio.html')
    if form_cookie:
        response.set_cookie('form', form_cookie)
    if message_cookie:
        response.set_cookie('message', message_cookie)
    return response


app.run(debug=True)