from django.shortcuts import render

from common.models import *

from alert_manager.StrategyBuilder import StrategyBuilder

import socket

from alert_manager import tasks as am_tasks

import majordome

from django.contrib.auth.decorators import login_required

@login_required

def alert_simulation(request):

    '''
        Opens a page with a button to simulate an alert
    '''

    return render(request, "alert_manager/alert_simulation.html", {})

@login_required

def alert_simulation_start(request):

    '''
        Called when the alert simulation button is pressed
        Opens a connection on the alert_listener simulation socket to unlock it (so that the workflow starts)
    '''

    Log.objects.all().delete()

    clientsocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    try:
        clientsocket.connect((am_tasks.IP, am_tasks.PORT))
        Log.objects.create(agent='Alert manager', message='Start simulation')
    except Exception as e:
        print("exception : ", e)

    return render(request, "alert_manager/alert_simulation.html", {})

@login_required

def alerts_list(request):

    '''
        Display the list of all alerts
    '''

    alerts = Alert.objects.order_by("-request__created")

    if StrategyObs.objects.filter(is_default=True).exists():
        current_default = StrategyObs.objects.filter(is_default=True)[0].name
        btn_type = "btn-primary"
    else:
        current_default = "Warning: please choose a default strategy"
        btn_type = "btn-danger"
    strat_list = StrategyObs.objects.all()
    return render(request, "alert_manager/alerts.html", locals())

@login_required
def change_default_strategy(request, strat_id):
    '''
        Changes the strategy to be used when an alert is received 
    '''

    strategies = StrategyObs.objects.all()
    if strategies.filter(id=strat_id).exists():
        for strat in strategies:
            strat.is_default = False
            strat.save()
        strat = strategies.get(id=strat_id)
        strat.is_default = True
        strat.save()

        success = True
        message = "Default strategy successfully changed"
    else:
        error = True
        message = "Could not find this strategy"

    alerts = Alert.objects.order_by("-request__created")
    if StrategyObs.objects.filter(is_default=True).exists():
        current_default = StrategyObs.objects.filter(is_default=True)[0].name
        btn_type = "btn-primary"
    else:
        current_default = "Warning: please choose a default strategy"
        btn_type = "btn-danger"
    strat_list = StrategyObs.objects.all()

    return render(request, "alert_manager/alerts.html", locals())

@login_required

def change_obs_strategy(request, alert_id):

    '''
        Open a page for a given alert, listing all the other strategies 
    '''

    alert = Alert.objects.get(id=alert_id)

    if alert.strategyobs is not None:
        strategies = StrategyObs.objects.exclude(id=alert.strategyobs.id)
    else:
        strategies = StrategyObs.objects.all()

    return render(request, "alert_manager/strategy_change.html", locals())

@login_required

def change_obs_strategy_validate(request, alert_id):

    '''
        Creates a new request with the strategy given for the selected alert
    '''

    try:
        alert = Alert.objects.get(id=alert_id)
    except Exception:
        alerts = Alert.objects.all()
        error = True
        message = "This alert doesn't exist"
        return render(request, "alert_manager/alerts.html", locals())

    strategies = StrategyObs.objects.exclude(id=alert.strategyobs.id)
    if request.method == "POST":

        strategy_id = request.POST["strategy_choice"]
        try:
            strategy = StrategyObs.objects.get(id=strategy_id)
        except Exception:
            error = True
            message = "This strategy doesn't exist"
            return render(request, "alert_manager/strategy_change.html", locals())

        if str(alert.strategyobs.id) == strategy_id:

            error = True
            message = "This is already the current strategy for this alert"
            return render(request, "alert_manager/strategy_change.html", locals())

        sb = StrategyBuilder()
        file = strategy.xml_file
        pyros_user = alert.request.pyros_user
        scientific_program = alert.request.scientific_program
        name = alert.request.name

        sb.create_request_from_strategy(file, pyros_user, scientific_program, name)
        req = sb.validate()

        alert.pk = None
        alert.strategyobs = strategy
        alert.request = req
        alert.save()
        strategies = StrategyObs.objects.exclude(id=alert.strategyobs.id)

        success = True
        message = "Strategy successfully changed. A new request was created."

    return render(request, "alert_manager/strategy_change.html", locals())