# -*- 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 __future__ import unicode_literals

from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from django.shortcuts import get_object_or_404, redirect
from django.utils.encoding import force_text
from django.utils.html import escape
from django.utils.http import urlencode
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext as _
from django.views.decorators.cache import never_cache

from weblate.formats.exporters import list_exporters
from weblate.lang.models import Language
from weblate.trans.forms import (
    AutoForm,
    BulkStateForm,
    ComponentMoveForm,
    ComponentRenameForm,
    DeleteForm,
    DownloadForm,
    NewUnitForm,
    ProjectRenameForm,
    ReplaceForm,
    ReportsForm,
    SearchForm,
    WhiteboardForm,
    get_new_language_form,
    get_upload_form,
)
from weblate.trans.models import Change, ComponentList, Translation, Unit
from weblate.trans.util import render, sort_objects, sort_unicode
from weblate.utils import messages
from weblate.utils.stats import prefetch_stats
from weblate.utils.views import (
    get_component,
    get_paginator,
    get_project,
    get_translation,
    try_set_language,
)


def optional_form(form, perm_user, perm, perm_obj, **kwargs):
    if not perm_user.has_perm(perm, perm_obj):
        return None
    return form(**kwargs)


@never_cache
def list_projects(request):
    """List all projects"""

    return render(
        request,
        'projects.html',
        {
            'allow_index': True,
            'projects': prefetch_stats(request.user.allowed_projects),
            'title': _('Projects'),
        },
    )


def show_engage(request, project, lang=None):
    # Get project object, skipping ACL
    obj = get_project(request, project, skip_acl=True)

    # Handle language parameter
    if lang is not None:
        language = get_object_or_404(Language, code=lang)
    else:
        language = None
    full_stats = obj.stats
    if language:
        try_set_language(lang)
        stats_obj = full_stats.get_single_language_stats(language)
    else:
        stats_obj = full_stats

    return render(
        request,
        'engage.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj,
            'full_stats': full_stats,
            'languages': stats_obj.languages,
            'total': obj.stats.source_strings,
            'percent': stats_obj.translated_percent,
            'language': language,
            'project_link': mark_safe(
                '<a href="{}">{}</a>'.format(
                    escape(obj.get_absolute_url()), escape(obj.name)
                )
            ),
            'title': _('Get involved in {0}!').format(obj),
        },
    )


@never_cache
def show_project(request, project):
    obj = get_project(request, project)
    user = request.user

    last_changes = Change.objects.prefetch().order().filter(project=obj)[:10]

    language_stats = sort_unicode(
        obj.stats.get_language_stats(), lambda x: force_text(x.language)
    )

    # Paginate components of project.
    all_components = obj.component_set.prefetch().order()
    components = prefetch_stats(get_paginator(request, all_components))

    return render(
        request,
        'project.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj,
            'last_changes': last_changes,
            'reports_form': ReportsForm(),
            'last_changes_url': urlencode({'project': obj.slug}),
            'language_stats': language_stats,
            'search_form': SearchForm(request.user),
            'whiteboard_form': optional_form(WhiteboardForm, user, 'project.edit', obj),
            'delete_form': optional_form(
                DeleteForm, user, 'project.edit', obj, obj=obj
            ),
            'rename_form': optional_form(
                ProjectRenameForm,
                user,
                'project.edit',
                obj,
                request=request,
                instance=obj,
            ),
            'replace_form': optional_form(ReplaceForm, user, 'unit.edit', obj),
            'bulk_state_form': optional_form(
                BulkStateForm, user, 'translation.auto', obj, user=user, obj=obj
            ),
            'components': components,
            'licenses': ', '.join(sorted(obj.get_licenses())),
        },
    )


@never_cache
def show_component(request, project, component):
    obj = get_component(request, project, component)
    user = request.user

    last_changes = Change.objects.prefetch().order().filter(component=obj)[:10]

    return render(
        request,
        'component.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj.project,
            'translations': sort_objects(
                prefetch_stats(obj.translation_set.prefetch())
            ),
            'reports_form': ReportsForm(),
            'last_changes': last_changes,
            'last_changes_url': urlencode(
                {'component': obj.slug, 'project': obj.project.slug}
            ),
            'language_count': Language.objects.filter(translation__component=obj)
            .distinct()
            .count(),
            'replace_form': optional_form(ReplaceForm, user, 'unit.edit', obj),
            'bulk_state_form': optional_form(
                BulkStateForm, user, 'translation.auto', obj, user=user, obj=obj
            ),
            'whiteboard_form': optional_form(
                WhiteboardForm, user, 'component.edit', obj
            ),
            'delete_form': optional_form(
                DeleteForm, user, 'component.edit', obj, obj=obj
            ),
            'rename_form': optional_form(
                ComponentRenameForm,
                user,
                'component.edit',
                obj,
                request=request,
                instance=obj,
            ),
            'move_form': optional_form(
                ComponentMoveForm,
                user,
                'component.edit',
                obj,
                request=request,
                instance=obj,
            ),
            'search_form': SearchForm(request.user),
            'alerts': obj.all_alerts,
        },
    )


@never_cache
def show_translation(request, project, component, lang):
    obj = get_translation(request, project, component, lang)
    obj.stats.ensure_all()
    last_changes = Change.objects.prefetch().order().filter(translation=obj)[:10]
    user = request.user

    # Get form
    form = get_upload_form(user, obj)

    search_form = SearchForm(request.user)

    return render(
        request,
        'translation.html',
        {
            'allow_index': True,
            'object': obj,
            'project': obj.component.project,
            'form': form,
            'download_form': DownloadForm(),
            'autoform': optional_form(
                AutoForm, user, 'translation.auto', obj, obj=obj.component
            ),
            'search_form': search_form,
            'replace_form': optional_form(ReplaceForm, user, 'unit.edit', obj),
            'bulk_state_form': optional_form(
                BulkStateForm, user, 'translation.auto', obj, user=user, obj=obj
            ),
            'new_unit_form': NewUnitForm(
                user, initial={'value': Unit(translation=obj, id_hash=-1)}
            ),
            'whiteboard_form': optional_form(
                WhiteboardForm, user, 'component.edit', obj
            ),
            'delete_form': optional_form(
                DeleteForm, user, 'translation.delete', obj, obj=obj
            ),
            'last_changes': last_changes,
            'last_changes_url': urlencode(obj.get_reverse_url_kwargs()),
            'other_translations': prefetch_stats(
                Translation.objects.prefetch()
                .filter(component__project=obj.component.project, language=obj.language)
                .exclude(pk=obj.pk)
            ),
            'exporters': list_exporters(obj),
        },
    )


@never_cache
def data_project(request, project):
    obj = get_project(request, project)
    return render(
        request,
        'data.html',
        {'object': obj, 'components': obj.component_set.order(), 'project': obj},
    )


@never_cache
@login_required
def new_language(request, project, component):
    obj = get_component(request, project, component)

    form_class = get_new_language_form(request, obj)
    can_add = obj.can_add_new_language(request)

    if request.method == 'POST':
        form = form_class(obj, request.POST)

        if form.is_valid():
            langs = form.cleaned_data['lang']
            kwargs = {
                'user': request.user,
                'author': request.user,
                'component': obj,
                'details': {},
            }
            for language in Language.objects.filter(code__in=langs):
                kwargs['details']['language'] = language.code
                if can_add:
                    translation = obj.add_new_language(language, request)
                    if translation:
                        kwargs['translation'] = translation
                        if len(langs) == 1:
                            obj = translation
                        Change.objects.create(
                            action=Change.ACTION_ADDED_LANGUAGE, **kwargs
                        )
                elif obj.new_lang == 'contact':
                    Change.objects.create(
                        action=Change.ACTION_REQUESTED_LANGUAGE, **kwargs
                    )
                    messages.success(
                        request,
                        _(
                            "A request for a new translation has been "
                            "sent to the project's maintainers."
                        ),
                    )
            return redirect(obj)
        messages.error(request, _('Please fix errors in the form.'))
    else:
        form = form_class(obj)

    return render(
        request,
        'new-language.html',
        {'object': obj, 'project': obj.project, 'form': form, 'can_add': can_add},
    )


@never_cache
def healthz(request):
    """Simple health check endpoint"""
    return HttpResponse('ok')


@never_cache
def show_component_list(request, name):
    obj = get_object_or_404(ComponentList, slug=name)

    return render(
        request,
        'component-list.html',
        {
            'object': obj,
            'components': obj.components.filter(
                project__in=request.user.allowed_projects
            ),
        },
    )
