import os

from django.http import HttpResponse, Http404

from django.shortcuts import redirect, render_to_response

from django.contrib.auth.models import User

from django.contrib.auth.decorators import login_required

from pytask.taskapp.models import Task, Profile, Request

from pytask.taskapp.events.request import reply_to_request

from pytask.taskapp.forms.user import UserProfileEditForm, UserChoiceForm

from pytask.taskapp.utilities.request import get_request, create_request

from pytask.taskapp.utilities.notification import get_notification, create_notification

from pytask.taskapp.utilities.user import get_user

about = {

    "addmentors": "about/addmentors.html",

    "mentor": "about/mentor.html", 

    "starthere": "about/starthere.html",

    "task": "about/task.html",

    "tasklife": "about/tasklife.html",

    "developer": "about/developer.html",

    "notification": "about/notification.html",

    "request": "about/request.html",

    "manager": "about/manager.html",

    "admin": "about/admin.html",

}

def show_msg(user, message, redirect_url=None, url_desc=None):

    """ simply redirect to homepage """

    return render_to_response('show_msg.html',{'user':user, 'message':message, 'redirect_url':redirect_url, 'url_desc':url_desc})

def homepage(request):

    """ check for authentication and display accordingly. """

    user = request.user

    is_guest = False

    is_mentor = False

    can_create_task = False

    task_list = []

    if not user.is_authenticated():

        is_guest = True

        disp_num = 10

        task_list = Task.objects.exclude(status="UP").exclude(status="CD").exclude(status="CM").order_by('published_datetime').reverse()[:10]

        return render_to_response('index.html', {'user':user, 'is_guest':is_guest, 'task_list':task_list})

    else:

        user = get_user(request.user)

        user_profile = user.get_profile()

        is_mentor = True if user.task_mentors.all() else False

        can_create_task = False if user_profile.rights == u"CT" else True

        context = {'user':user,

                   'is_guest':is_guest,

                   'is_mentor':is_mentor,

                   'task_list':task_list,

                   'can_create_task':can_create_task,

                   }

        context["unpublished_tasks"] = user.task_mentors.filter(status="UP")

        context["mentored_tasks"] = user.task_mentors.exclude(status="UP").exclude(status="CM").exclude(status="CD").exclude(status="DL")

        context["claimed_tasks"] = user.task_claimed_users.exclude(status="UP").exclude(status="CM").exclude(status="CD").exclude(status="DL")

        context["working_tasks"] = user.task_assigned_users.filter(status="WR")

        return render_to_response('index.html', context)

@login_required

def learn_more(request, what):

    """ depending on what was asked for, we render different pages.

    """

    user = get_user(request.user)

    disp_template = about.get(what, None)

    if not disp_template:

        raise Http404

    else:

        return render_to_response(disp_template, {'user':user})

@login_required

def view_my_profile(request,uid=None):

    """ allows the user to view the profiles of users """

    user = get_user(request.user)

    if uid == None:

        edit_profile = True

        profile = Profile.objects.get(user = request.user)

        return render_to_response('user/my_profile.html', {'edit_profile':edit_profile,'profile':profile, 'user':user})

    edit_profile = True if request.user == User.objects.get(pk=uid) else False

    try:

        profile = Profile.objects.get(user = User.objects.get(pk=uid))

    except Profile.DoesNotExist:

        raise Http404

    return render_to_response('user/my_profile.html', {'edit_profile':edit_profile,'profile':profile, 'user':user})

@login_required

def edit_my_profile(request):

    """ enables the user to edit his/her user profile """

    user = get_user(request.user)

    if request.method == 'POST':

    else:

        edit_profile_form = UserProfileEditForm(instance = profile)

        return render_to_response('user/edit_profile.html',{'edit_profile_form' : edit_profile_form, 'user':user})

@login_required

def browse_requests(request):

    user = get_user(request.user)

    active_reqs = user.request_sent_to.filter(is_replied=False).exclude(is_valid=False)

    reqs = active_reqs.order_by('creation_date').reverse()

    context = {

        'user':user,

        'reqs':reqs,

    }

    return render_to_response('user/browse_requests.html', context)

@login_required

def view_request(request, rid):

    """ please note that request variable in this method is that of django.

    our app request is called user_request.

    """

    user = get_user(request.user)

    user_rights = user.get_profile().rights

    newest, newer, user_request, older, oldest = get_request(rid, user)

    if not user_request:

        raise Http404

    user_request.is_read = True

    user_request.save()

    context = {

        'user':user,

        'req':user_request,

        'sent_users':user_request.sent_to.all(),

        'newest':newest,

        'newer':newer,

        'older':older,

        'oldest':oldest,

    }

    return render_to_response('user/view_request.html', context)

@login_required

def process_request(request, rid, reply):

    """ check if the method is post and then update the request.

    if it is get, display a 404 error.

    """

    user = get_user(request.user)

    browse_request_url= '/user/requests'

    newest, newer, req_obj, older, oldest = get_request(rid, user)

    if not req_obj:

        return show_msg(user, "Your reply has been processed", browse_request_url, "view other requests")

    if request.method=="POST":

        reply = True if reply == "yes" else False

        req_obj.remarks = request.POST.get('remarks', "")

        req_obj.save()

        reply_to_request(req_obj, reply, user)

        return redirect('/user/requests/')

        return show_msg(user, "Your reply has been processed", browse_request_url, "view other requests")

    else:

        return show_msg(user, "You are not authorised to do this", browse_request_url, "view other requests")

@login_required

def browse_notifications(request):

    """ get the list of notifications that are not deleted and display in datetime order.

    """

    user = get_user(request.user)

    active_notifications = user.notification_sent_to.filter(is_deleted=False).order_by('sent_date').reverse()

    context = {

        'user':user,

        'notifications':active_notifications,

    }

    return render_to_response('user/browse_notifications.html', context)

@login_required

def view_notification(request, nid):

    """ get the notification depending on nid.

    Display it.

    """

    user = get_user(request.user)

    newest, newer, notification, older, oldest = get_notification(nid, user)

    if not notification:

        raise Http404

    notification.is_read = True

    notification.save()

    context = {

        'user':user,

        'notification':notification,

        'newest':newest,

        'newer':newer,

        'older':older,

        'oldest':oldest,

    }

    return render_to_response('user/view_notification.html', context)

@login_required

def edit_notification(request, nid, action):

    """ if action is delete, set is_deleted.

    if it is unread, unset is_read.

    save the notification and redirect to browse_notifications.

    """

    user = get_user(request.user)

    newest, newer, notification, older, oldest = get_notification(nid, user)

    if not notification:

        raise Http404

    notifications_url = "/user/notifications/"

    if request.method == "POST":

        if action == "delete":

            notification.is_deleted = True

        elif action == "unread":

            notification.is_read = False

        notification.save()

        if older:

            return redirect('/user/notifications/nid=%s'%older.id)

        else:

            return redirect(notifications_url)

    else:

        return show_msg(user, 'This is wrong', notification_url, "view the notification")

@login_required

def change_rights(request, role):

    """ check if the current user has privileges to do this.

    """

    user = get_user(request.user)

    role = role.upper()

    user_profile = user.get_profile()

    user_rights = user_profile.rights

    user_can_view = True if user_rights == "AD" or ( user_rights == "MG" and role in ["MG", "DV"] ) else False

    if user_can_view:

        if role == "DV":

            current_contributors = list(User.objects.filter(is_active=True,profile__rights="CT"))

            pending_requests = user.request_sent_by.filter(is_replied=False,is_valid=True)

            pending_dv_requests = pending_requests.filter(role="DV")

            ## one cannot make same request many times

            for req in pending_dv_requests:

                current_contributors.remove(req.sent_to.all()[0])

            choices = [ (_.id,_.username ) for _ in current_contributors ]

        elif role == "MG":

            active_users = User.objects.filter(is_active=True)

            dv_ct_users = list(active_users.filter(profile__rights="CT") | active_users.filter(profile__rights="DV"))

            pending_requests = user.request_sent_by.filter(is_replied=False,is_valid=True)

            pending_mg_requests = pending_requests.filter(role="MG")

            ## same logic here. you cannot make another request exactly the same.

            ## but iam still not decided whether someone who requests a user to be admin,

            ## can be given a chance to request the same user to be a manager or developer

            for req in pending_mg_requests:

                dv_ct_users.remove(req.sent_to.all()[0])

            choices = [ (_.id, _.username ) for _ in dv_ct_users ]

        elif role == "AD":

            active_users = User.objects.filter(is_active=True)

            non_ad_users = list(active_users.exclude(profile__rights="AD"))

            pending_requests = user.request_sent_by.filter(is_replied=False,is_valid=True)

            pending_ad_requests = pending_requests.filter(role="AD")

            ## we filter out users who have already been requested by the user to be an admin

            for req in pending_ad_requests:

                non_ad_users.remove(req.sent_to.all()[0])

            choices = [ (_.id,_.username ) for _ in non_ad_users ]

        form = UserChoiceForm(choices)

        context = {

            'user':user,

            'form':form,

        }

        if request.method=="POST":

            data = request.POST

            form = UserChoiceForm(choices, data)

            if form.is_valid():

                user_to_change = User.objects.get(id=form.cleaned_data['user'])

                create_request(sent_by=user, role=role, sent_to=user_to_change)

                return show_msg(user, "A request has been sent", "/", "return to home page")

            else:

                raise Http404

        else:

            return render_to_response('user/changerole.html', context)

    else:

        raise Http404