#
# This file is part of FreedomBox.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
"""
Django views for Gitweb.
"""

from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin
from django.http import Http404
from django.shortcuts import redirect
from django.template.response import TemplateResponse
from django.urls import reverse_lazy
from django.utils.translation import ugettext as _
from django.views.generic import FormView

from plinth import actions, views
from plinth.errors import ActionError
from plinth.modules import gitweb

from .forms import CreateRepoForm, EditRepoForm


class GitwebAppView(views.AppView):
    """Serve configuration page."""

    clients = gitweb.clients
    name = gitweb.name
    description = gitweb.description
    diagnostics_module_name = 'gitweb'
    app_id = 'gitweb'
    show_status_block = False
    template_name = 'gitweb_configure.html'
    icon_filename = gitweb.icon_filename

    def get_context_data(self, *args, **kwargs):
        """Add repositories to the context data."""
        context = super().get_context_data(*args, **kwargs)
        repos = gitweb.app.get_repo_list()
        context['repos'] = repos
        context['cloning'] = any('clone_progress' in repo for repo in repos)
        return context


class CreateRepoView(SuccessMessageMixin, FormView):
    """View to create a new repository."""

    form_class = CreateRepoForm
    prefix = 'gitweb'
    template_name = 'gitweb_create_edit.html'
    success_url = reverse_lazy('gitweb:index')
    success_message = _('Repository created.')

    def get_context_data(self, **kwargs):
        """Return additional context for rendering the template."""
        context = super().get_context_data(**kwargs)
        context['title'] = _('Create Repository')
        return context

    def form_valid(self, form):
        """Create the repository on valid form submission."""
        form_data = {}
        for key, value in form.cleaned_data.items():
            if value is None:
                form_data[key] = ''
            else:
                form_data[key] = value
        try:
            gitweb.create_repo(form_data['name'], form_data['description'],
                               form_data['owner'], form_data['is_private'])
        except ActionError:
            messages.error(
                self.request,
                _('An error occurred while creating the repository.'))
        gitweb.app.update_service_access()

        return super().form_valid(form)


class EditRepoView(SuccessMessageMixin, FormView):
    """View to edit an existing repository."""

    form_class = EditRepoForm
    prefix = 'gitweb'
    template_name = 'gitweb_create_edit.html'
    success_url = reverse_lazy('gitweb:index')
    success_message = _('Repository edited.')

    def get_context_data(self, **kwargs):
        """Return additional context for rendering the template."""
        context = super().get_context_data(**kwargs)
        context['title'] = _('Edit repository')
        return context

    def get_initial(self):
        """Load information about repository being edited."""
        name = self.kwargs['name']
        for repo in gitweb.app.get_repo_list():
            if repo['name'] == name and 'clone_progress' not in repo:
                break
        else:
            raise Http404

        return gitweb.repo_info(name)

    def form_valid(self, form):
        """Edit the repo on valid form submission."""
        if form.initial != form.cleaned_data:
            form_data = {}
            for key, value in form.cleaned_data.items():
                if value is None:
                    form_data[key] = ''
                else:
                    form_data[key] = value

            try:
                gitweb.edit_repo(form.initial, form_data)
            except ActionError:
                messages.error(self.request,
                               _('An error occurred during configuration.'))
        gitweb.app.update_service_access()

        return super().form_valid(form)


def delete(request, name):
    """Handle deleting repositories, showing a confirmation dialog first.

    On GET, display a confirmation page.
    On POST, delete the repository.
    """
    for repo in gitweb.app.get_repo_list():
        if repo['name'] == name and 'clone_progress' not in repo:
            break
    else:
        raise Http404

    if request.method == 'POST':
        try:
            gitweb.delete_repo(name)
            messages.success(request, _('{name} deleted.').format(name=name))
        except actions.ActionError as error:
            messages.error(
                request,
                _('Could not delete {name}: {error}').format(
                    name=name, error=error),
            )
        gitweb.app.update_service_access()

        return redirect(reverse_lazy('gitweb:index'))

    return TemplateResponse(request, 'gitweb_delete.html', {
        'title': gitweb.name,
        'name': name
    })