# -*- coding: utf-8 -*-
#
# Copyright © 2012 - 2020 Michal Čihař <michal@cihar.com>
#
# This file is part of Weblate <https://weblate.org/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

from django.contrib.auth.decorators import login_required
from django.core.exceptions import PermissionDenied
from django.http import JsonResponse
from django.shortcuts import get_object_or_404, redirect
from django.utils.translation import ugettext as _
from django.views.decorators.http import require_POST

from weblate.trans.forms import (
    ComponentMoveForm,
    ComponentRenameForm,
    DeleteForm,
    ProjectRenameForm,
    WhiteboardForm,
)
from weblate.trans.models import Change, WhiteboardMessage
from weblate.trans.tasks import component_removal, project_removal
from weblate.trans.util import redirect_param, render
from weblate.utils import messages
from weblate.utils.views import (
    get_component,
    get_project,
    get_translation,
    show_form_errors,
)


@login_required
@require_POST
def remove_translation(request, project, component, lang):
    obj = get_translation(request, project, component, lang)

    if not request.user.has_perm('translation.delete', obj):
        raise PermissionDenied()

    form = DeleteForm(obj, request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#delete')

    obj.remove(request.user)
    messages.success(request, _('Translation has been removed.'))

    return redirect(obj.component)


@login_required
@require_POST
def remove_component(request, project, component):
    obj = get_component(request, project, component)

    if not request.user.has_perm('component.edit', obj):
        raise PermissionDenied()

    form = DeleteForm(obj, request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#delete')

    component_removal.delay(obj.pk, request.user.pk)
    messages.success(
        request, _('Translation component was scheduled for removal.')
    )

    return redirect(obj.project)


@login_required
@require_POST
def remove_project(request, project):
    obj = get_project(request, project)

    if not request.user.has_perm('project.edit', obj):
        raise PermissionDenied()

    form = DeleteForm(obj, request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#delete')

    project_removal.delay(obj.pk, request.user.pk)
    messages.success(request, _('Project was scheduled for removal.'))
    return redirect('home')


def perform_rename(form_cls, request, obj, perm, **kwargs):
    if not request.user.has_perm(perm, obj):
        raise PermissionDenied()

    form = form_cls(request, request.POST, instance=obj)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#delete')

    # Invalidate old stats
    obj.stats.invalidate()

    obj = form.save()
    # Invalidate new stats
    obj.stats.invalidate()

    Change.objects.create(
        user=request.user,
        author=request.user,
        **kwargs
    )

    return redirect(obj)


@login_required
@require_POST
def rename_component(request, project, component):
    obj = get_component(request, project, component)
    return perform_rename(
        ComponentRenameForm, request, obj, 'component.edit',
        component=obj, target=obj.slug, action=Change.ACTION_RENAME_COMPONENT
    )


@login_required
@require_POST
def move_component(request, project, component):
    obj = get_component(request, project, component)
    return perform_rename(
        ComponentMoveForm, request, obj, 'project.edit',
        component=obj, target=obj.project.slug,
        action=Change.ACTION_MOVE_COMPONENT
    )


@login_required
@require_POST
def rename_project(request, project):
    obj = get_project(request, project)
    return perform_rename(
        ProjectRenameForm, request, obj, 'project.edit',
        project=obj, target=obj.slug, action=Change.ACTION_RENAME_PROJECT
    )


@login_required
@require_POST
def whiteboard_translation(request, project, component, lang):
    obj = get_translation(request, project, component, lang)

    if not request.user.has_perm('component.edit', obj):
        raise PermissionDenied()

    form = WhiteboardForm(request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#whiteboard')

    WhiteboardMessage.objects.create(
        project=obj.component.project,
        component=obj.component,
        language=obj.language,
        **form.cleaned_data
    )

    return redirect(obj)


@login_required
@require_POST
def whiteboard_component(request, project, component):
    obj = get_component(request, project, component)

    if not request.user.has_perm('component.edit', obj):
        raise PermissionDenied()

    form = WhiteboardForm(request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#whiteboard')

    WhiteboardMessage.objects.create(
        project=obj.project,
        component=obj,
        **form.cleaned_data
    )

    return redirect(obj)


@login_required
@require_POST
def whiteboard_project(request, project):
    obj = get_project(request, project)

    if not request.user.has_perm('project.edit', obj):
        raise PermissionDenied()

    form = WhiteboardForm(request.POST)
    if not form.is_valid():
        show_form_errors(request, form)
        return redirect_param(obj, '#whiteboard')

    WhiteboardMessage.objects.create(
        project=obj,
        **form.cleaned_data
    )

    return redirect(obj)


@login_required
@require_POST
def whiteboard_delete(request, pk):
    whiteboard = get_object_or_404(WhiteboardMessage, pk=pk)

    if (request.user.has_perm('component.edit', whiteboard.component)
            or request.user.has_perm('project.edit', whiteboard.project)):
        whiteboard.delete()

    return JsonResponse({'responseStatus': 200})


@login_required
def component_progress(request, project, component):
    obj = get_component(request, project, component)
    return_url = 'component' if 'info' in request.GET else 'guide'
    if not obj.in_progress():
        return redirect(return_url, **obj.get_reverse_url_kwargs())

    progress, log = obj.get_progress()

    return render(
        request,
        'component-progress.html',
        {
            'object': obj,
            'progress': progress,
            'log': '\n'.join(log),
            'return_url': return_url,
        }
    )


@require_POST
@login_required
def component_progress_terminate(request, project, component):
    obj = get_component(request, project, component)

    if obj.in_progress and request.user.has_perm('component.edit', obj):
        obj.background_task.revoke(terminate=True)

    return redirect(obj)


@login_required
def component_progress_js(request, project, component):
    obj = get_component(request, project, component)
    progress, log = obj.get_progress()
    return JsonResponse({
        'in_progress': obj.in_progress(),
        'progress': progress,
        'log': '\n'.join(log)
    })
