from django.http import Http404, HttpResponseNotAllowed

from django.shortcuts import render, redirect, get_object_or_404

from django.contrib.auth.decorators import login_required

from django.contrib import messages

from symposion.utils.mail import send_email

from symposion.teams.forms import TeamInvitationForm

from symposion.teams.models import Team, Membership

#

# @@@ these can be moved

def can_join(team, user):

    state = team.get_state_for_user(user)

    if team.access == "open" and state is None:

        return True

    elif state == "invited":

        return True

    elif user.is_staff and state is None:

        return True

    else:

    else:

        return False

def can_invite(team, user):

    state = team.get_state_for_user(user)

    if team.access == "invitation":

        if state == "manager" or user.is_staff:

            return True

    return False

@login_required

def team_detail(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

    if team.access == "invitation" and state is None and not request.user.is_staff:

        raise Http404()

    if can_invite(team, request.user):

        if request.method == "POST":

            form = TeamInvitationForm(request.POST, team=team)

            if form.is_valid():

                form.invite()

                send_email([form.user.email], "teams_user_invited", context={"team": team})

                messages.success(request, "Invitation created.")

                return redirect("team_detail", slug=slug)

        else:

            form = TeamInvitationForm(team=team)

    else:

        form = None

    return render(request, "teams/team_detail.html", {

        "team": team,

        "state": state,

        "invite_form": form,

        "can_join": can_join(team, request.user),

        "can_leave": can_leave(team, request.user),

        "can_apply": can_apply(team, request.user),

    })

@login_required

def team_join(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

    if team.access == "invitation" and state is None and not request.user.is_staff:

        raise Http404()

    if can_join(team, request.user) and request.method == "POST":

        membership, created = Membership.objects.get_or_create(team=team, user=request.user)

        membership.state = "member"

        membership.save()

        messages.success(request, "Joined team.")

        return redirect("team_detail", slug=slug)

    else:

        return redirect("team_detail", slug=slug)

@login_required

def team_leave(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

    if team.access == "invitation" and state is None and not request.user.is_staff:

        raise Http404()

    if can_leave(team, request.user) and request.method == "POST":

        membership = Membership.objects.get(team=team, user=request.user)

        membership.delete()

        messages.success(request, "Left team.")

        return redirect("dashboard")

    else:

        return redirect("team_detail", slug=slug)

@login_required

def team_apply(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

    if team.access == "invitation" and state is None and not request.user.is_staff:

        raise Http404()

    if can_apply(team, request.user) and request.method == "POST":

        membership, created = Membership.objects.get_or_create(team=team, user=request.user)

        membership.state = "applied"

        membership.save()

        managers = [m.user.email for m in team.managers()]

        send_email(managers, "teams_user_applied", context={

            "team": team,

            "user": request.user

        })

        messages.success(request, "Applied to join team.")

        return redirect("team_detail", slug=slug)

    else: