# SPDX-License-Identifier: GPL-3.0-or-later

# Proxy web UI packages loading.
#
# This file is part of Hydrilla&Haketilo.
#
# Copyright (C) 2022 Wojtek Kosior
#
# 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/>.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this
# file's license. Although I request that you do not make use of this
# code in a proprietary program, I am not going to enforce this in
# court.

"""
.....
"""

# Enable using with Python 3.7.
from __future__ import annotations

import tempfile
import zipfile
import typing as t

from pathlib import Path

import flask
import werkzeug

from ...exceptions import HaketiloException
from ...translations import smart_gettext as _
from ... import item_infos
from .. import state as st
from . import _app


bp = flask.Blueprint('items', __package__)

@bp.route('/load_from_disk', methods=['GET'])
def load_from_disk(errors: t.Mapping[str, bool] = {}) -> werkzeug.Response:
    html = flask.render_template('items/load_from_disk.html.jinja', **errors)
    return flask.make_response(html, 200)

@bp.route('/load_from_disk', methods=['POST'])
def load_from_disk_post() -> werkzeug.Response:
    zip_file_storage = flask.request.files.get('items_zipfile')
    if zip_file_storage is None:
        return load_from_disk()

    with tempfile.TemporaryDirectory() as tmpdir_str:
        tmpdir = Path(tmpdir_str)
        tmpdir_child = tmpdir / 'childdir'
        tmpdir_child.mkdir()

        try:
            with zipfile.ZipFile(zip_file_storage) as zip_file:
                zip_file.extractall(tmpdir_child)
        except:
            return load_from_disk({'uploaded_file_not_zip': True})

        extracted_top_level_files = tuple(tmpdir_child.iterdir())
        if extracted_top_level_files == ():
            return load_from_disk({'invalid_uploaded_malcontent': True})

        if len(extracted_top_level_files) == 1 and \
           extracted_top_level_files[0].is_dir():
            malcontent_dir_path = extracted_top_level_files[0]
        else:
            malcontent_dir_path = tmpdir_child

        try:
            _app.get_haketilo_state().import_items(malcontent_dir_path)
        except:
            return load_from_disk({'invalid_uploaded_malcontent': True})

    return flask.redirect(flask.url_for('.packages'))

@bp.route('/packages')
def packages() -> werkzeug.Response:
    store = _app.get_haketilo_state().mapping_store()

    html = flask.render_template(
        'items/packages.html.jinja',
        display_infos = store.get_display_infos()
    )
    return flask.make_response(html, 200)

@bp.route('/libraries')
def libraries() -> werkzeug.Response:
    store = _app.get_haketilo_state().resource_store()

    html = flask.render_template(
        'items/libraries.html.jinja',
        display_infos = store.get_display_infos()
    )
    return flask.make_response(html, 200)

def item_store(state: st.HaketiloState, item_type: item_infos.ItemType) \
    -> t.Union[st.MappingStore, st.ResourceStore]:
        if item_type == item_infos.ItemType.RESOURCE:
            return state.resource_store()
        else:
            return state.mapping_store()

def show_item(item_id: str, item_type: item_infos.ItemType) \
    -> werkzeug.Response:
    try:
        store = item_store(_app.get_haketilo_state(), item_type)
        display_info = store.get(str(item_id)).get_display_info()

        html = flask.render_template(
            f'items/{item_type.alt_name}_view.html.jinja',
            display_info = display_info
        )
        return flask.make_response(html, 200)
    except st.MissingItemError:
        flask.abort(404)


@bp.route('/libraries/view/<string:item_id>')
def show_library(item_id: str) -> werkzeug.Response:
    return show_item(item_id, item_infos.ItemType.RESOURCE)

@bp.route('/packages/view/<string:item_id>')
def show_package(item_id: str) -> werkzeug.Response:
    return show_item(item_id, item_infos.ItemType.MAPPING)

ItemVersionDisplayInfo = t.Union[
    st.MappingVersionDisplayInfo,
    st.ResourceVersionDisplayInfo
]

def item_version_store(
        state:     st.HaketiloState,
        item_type: item_infos.ItemType
) -> t.Union[st.MappingVersionStore, st.ResourceVersionStore]:
        if item_type == item_infos.ItemType.RESOURCE:
            return state.resource_version_store()
        else:
            return state.mapping_version_store()

def show_item_version(
        item_version_id: str,
        item_type:          item_infos.ItemType,
        errors:             t.Mapping[str, bool] = {}
) -> werkzeug.Response:
    try:
        store = item_version_store(_app.get_haketilo_state(), item_type)
        version_ref = store.get(item_version_id)
        display_info = version_ref.get_item_display_info()

        this_info:   t.Optional[ItemVersionDisplayInfo] = None

        for info in display_info.all_versions:
            if info.ref == version_ref:
                this_info = info

        assert this_info is not None

        html = flask.render_template(
            f'items/{item_type.alt_name}_viewversion.html.jinja',
            display_info         = display_info,
            version_display_info = this_info,
            **errors
        )
        return flask.make_response(html, 200)
    except st.MissingItemError:
        flask.abort(404)

@bp.route('/libraries/viewversion/<string:item_version_id>')
def show_library_version(item_version_id: str) -> werkzeug.Response:
    return show_item_version(item_version_id, item_infos.ItemType.RESOURCE)

@bp.route('/packages/viewversion/<string:item_version_id>')
def show_package_version(item_version_id: str) -> werkzeug.Response:
    return show_item_version(item_version_id, item_infos.ItemType.MAPPING)

def alter_item_version(item_version_id: str, item_type: item_infos.ItemType) \
    -> werkzeug.Response:
    form_data = flask.request.form
    action = form_data['action']

    try:
        store = item_version_store(_app.get_haketilo_state(), item_type)
        item_version_ref = store.get(item_version_id)

        if action == 'disable_item':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(st.EnabledStatus.DISABLED)
        elif action == 'unenable_item':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(st.EnabledStatus.NO_MARK)
        elif action == 'enable_item_version':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(
                enabled = st.EnabledStatus.ENABLED,
                frozen  = st.FrozenStatus.EXACT_VERSION,
            )
        elif action == 'unfreeze_item':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(
                enabled = st.EnabledStatus.ENABLED,
                frozen  = st.FrozenStatus.NOT_FROZEN,
            )
        elif action == 'freeze_to_repo':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(
                enabled = st.EnabledStatus.ENABLED,
                frozen  = st.FrozenStatus.REPOSITORY,
            )
        elif action == 'freeze_to_version':
            assert isinstance(item_version_ref, st.MappingVersionRef)
            item_version_ref.update_mapping_status(
                enabled = st.EnabledStatus.ENABLED,
                frozen  = st.FrozenStatus.EXACT_VERSION,
            )
        elif action == 'install_item_version':
            item_version_ref.install()
        elif action == 'uninstall_item_version':
            item_version_ref_after = item_version_ref.uninstall()
            if item_version_ref_after is None:
                url = flask.url_for(f'.{item_type.alt_name_plural}')
                return flask.redirect(url)
            else:
                return show_item_version(item_version_id, item_type)
        else:
            raise ValueError()
    except st.RepoCommunicationError:
        return show_item_version(
            item_version_id = item_version_id,
            item_type       = item_type,
            errors          = {'repo_communication_error': True}
        )
    except st.FileInstallationError:
        return show_item_version(
            item_version_id = item_version_id,
            item_type       = item_type,
            errors          = {'file_installation_error': True}
        )
    except st.ImpossibleSituation:
        return show_item_version(
            item_version_id = item_version_id,
            item_type       = item_type,
            errors          = {'uninstall_disallowed': True}
        )
    except st.MissingItemError:
        flask.abort(404)

    return flask.redirect(
        flask.url_for(
            f'.show_{item_type.alt_name}_version',
            item_version_id = item_version_id
        )
    )

@bp.route('/libraries/viewversion/<string:item_version_id>', methods=['POST'])
def alter_library_version(item_version_id: str) -> werkzeug.Response:
    return alter_item_version(item_version_id, item_infos.ItemType.RESOURCE)

@bp.route('/packages/viewversion/<string:item_version_id>', methods=['POST'])
def alter_package_version(item_version_id: str) -> werkzeug.Response:
    return alter_item_version(item_version_id, item_infos.ItemType.MAPPING)