from django.shortcuts import render

from common.models import *

from alert_manager.StrategyBuilder import StrategyBuilder

import socket

import majordome

from django.contrib.auth.decorators import login_required

import alert_manager.tasks

import os, time, shutil

TEST_FILE = "unittest_voevent.xml"

TEST_FILE_PATH = os.path.join(alert_manager.tasks.VOEVENTS_PATH, TEST_FILE)

VOEVENTS_TO_SEND_PATH = "alert_manager/events_to_send"

@login_required

def start_simulation(request):

    '''
        Called when the alert simulation button is pressed

        Deletes then copies the test voevent file from the events_received folder

    '''

    if os.path.isfile(TEST_FILE_PATH):
        os.remove(TEST_FILE_PATH)
        print("================== DELETE FILE ==================")
        time.sleep(3)

    print("================== COPY FILE ==================")
    shutil.copyfile(os.path.join(VOEVENTS_TO_SEND_PATH, TEST_FILE),
                        TEST_FILE_PATH)
    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()

    success = True
    message = "Simulation started successfully"
    return render(request, "alert_manager/alerts.html", locals())

@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_id = req
        alert.__dict__.update(req.__dict__)

        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())