#!/usr/bin/env python
#
# Copyright (C) 2016 GNS3 Technologies Inc.
#
# 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 <http://www.gnu.org/licenses/>.

import os
import json
import uuid
import asyncio
import zipfile
import aiohttp

from ..config import Config


"""
Handle the import of project from a .gns3project
"""

@asyncio.coroutine
def import_project(controller, project_id, stream, gns3vm=True):
    """
    Import a project contain in a zip file

    You need to handle OSerror exceptions

    :param stream: A io.BytesIO of the zipfile
    :param gns3vm: True move Docker, IOU and Qemu to the GNS3 VM
    :returns: Project
    """
    server_config = Config.instance().get_section_config("Server")
    projects_path = os.path.expanduser(server_config.get("projects_path", "~/GNS3/projects"))
    os.makedirs(projects_path, exist_ok=True)

    with zipfile.ZipFile(stream) as myzip:

        try:
            topology = json.loads(myzip.read("project.gns3").decode())
            # If the project name is already used we generate a new one
            topology["name"] = controller.get_free_project_name(topology["name"])
        except KeyError:
            raise aiohttp.web.HTTPConflict(text="Can't import topology the .gns3 is corrupted or missing")

        path = os.path.join(projects_path, topology["name"])
        os.makedirs(path)
        myzip.extractall(path)

        dot_gns3_path = os.path.join(path, topology["name"] + ".gns3")
        # We change the project_id to avoid erasing the project
        topology["project_id"] = project_id
        with open(dot_gns3_path, "w+") as f:
            json.dump(topology, f, indent=4)
        os.remove(os.path.join(path, "project.gns3"))

    project = yield from controller.load_project(dot_gns3_path)
    return project