from django.core.urlresolvers import reverse
from django.http import Http404
from django.shortcuts import redirect
from django.template import RequestContext
from django.utils.translation import ugettext as _
from misago.apps.errors import error403, error404
from misago.conf import settings
from misago import messages
from misago.models import Rank, User
from misago.shortcuts import render_to_response
from misago.utils.strings import slugify
from misago.utils.pagination import make_pagination
from misago.apps.profiles.forms import QuickFindUserForm

def list(request, slug=None, page=0):
    ranks = Rank.objects.filter(as_tab=1).order_by('order')

    # Find active rank
    default_rank = False
    active_rank = None
    if slug:
        for rank in ranks:
            if rank.slug == slug:
                active_rank = rank
        if not active_rank:
            return error404(request)
        if ranks and active_rank.slug == ranks[0].slug:
            return redirect(reverse('users'))
    elif ranks:
        default_rank = True
        active_rank = ranks[0]

    # Empty Defaults
    message = None
    users = []
    items_total = 0
    pagination = None
    in_search = False

    # Users search?
    if request.method == 'POST':
        if not request.acl.users.can_search_users():
            return error403(request)
        in_search = True
        active_rank = None
        search_form = QuickFindUserForm(request.POST, request=request)
        if search_form.is_valid():
            # Direct hit?
            username = search_form.cleaned_data['username']
            try:
                user = User.objects
                if settings.PROFILE_EXTENSIONS_PRELOAD:
                    user = user.select_related(*settings.PROFILE_EXTENSIONS_PRELOAD)
                user = user.get(username__iexact=username)
                return redirect(reverse('user', args=(user.username_slug, user.pk)))
            except User.DoesNotExist:
                pass

            # Looks like well have to find near match
            if len(username) > 6:
                username = username[0:-3]
            elif len(username) > 5:
                username = username[0:-2]
            elif len(username) > 4:
                username = username[0:-1]
            username = slugify(username.strip())

            # Go for rought match
            if len(username) > 0:
                users = User.objects
                if settings.PROFILE_EXTENSIONS_PRELOAD:
                    users = users.select_related(*settings.PROFILE_EXTENSIONS_PRELOAD)
                users = users.filter(username_slug__startswith=username).order_by('username_slug')[:10]
        elif 'username' in search_form.errors:
            message = messages.Message(_("To search users you have to enter username in search field."), messages.ERROR)
        else:
            message = messages.Message(search_form.non_field_errors()[0], messages.ERROR)
    else:
        search_form = QuickFindUserForm(request=request)
        if active_rank:
            users = User.objects.filter(rank=active_rank)
            items_total = users.count()
            try:
                pagination = make_pagination(page, items_total, settings.profiles_per_list)
            except Http404:
                if not default_rank and active_rank:
                    return redirect(reverse('users', kwargs={'slug': active_rank.slug}))
                return redirect(reverse('users'))
            if settings.PROFILE_EXTENSIONS_PRELOAD:
                users = users.select_related(*settings.PROFILE_EXTENSIONS_PRELOAD)
            users = users.order_by('username_slug')[pagination['start']:pagination['stop']]

    return render_to_response('profiles/list.html',
                              {
                              'message': message,
                              'search_form': search_form,
                              'in_search': in_search,
                              'active_rank': active_rank,
                              'default_rank': default_rank,
                              'items_total': items_total,
                              'ranks': ranks,
                              'users': users,
                              'pagination': pagination,
                              },
                              context_instance=RequestContext(request));