#!/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 pytest
import asyncio
from unittest.mock import MagicMock


from gns3server.controller.link import Link
from gns3server.controller.node import Node
from gns3server.controller.compute import Compute
from gns3server.controller.project import Project

from tests.utils import AsyncioBytesIO


@pytest.fixture
def project(controller):
    return Project(controller=controller)


@pytest.fixture
def compute():
    return Compute("example.com", controller=MagicMock())


@pytest.fixture
def link(async_run, project, compute):
    node1 = Node(project, compute, "node1")
    node2 = Node(project, compute, "node2")

    link = Link(project)
    async_run(link.add_node(node1, 0, 4))
    async_run(link.add_node(node2, 1, 3))
    return link


def test_addNode(async_run, project, compute):
    node1 = Node(project, compute, "node1")

    link = Link(project)
    async_run(link.add_node(node1, 0, 4))
    assert link._nodes == [
        {
            "node": node1,
            "adapter_number": 0,
            "port_number": 4
        }
    ]


def test_json(async_run, project, compute):
    node1 = Node(project, compute, "node1")
    node2 = Node(project, compute, "node2")

    link = Link(project)
    async_run(link.add_node(node1, 0, 4))
    async_run(link.add_node(node2, 1, 3))
    assert link.__json__() == {
        "link_id": link.id,
        "project_id": project.id,
        "nodes": [
            {
                "node_id": node1.id,
                "adapter_number": 0,
                "port_number": 4
            },
            {
                "node_id": node2.id,
                "adapter_number": 1,
                "port_number": 3
            }
        ],
        "capturing": False,
        "capture_file_name": None,
        "capture_file_path": None
    }


def test_start_streaming_pcap(link, async_run, tmpdir, project):
    @asyncio.coroutine
    def fake_reader():
        output = AsyncioBytesIO()
        yield from output.write(b"hello")
        output.seek(0)
        return output

    link._capture_file_name = "test.pcap"
    link._capturing = True
    link.read_pcap_from_source = fake_reader
    async_run(link._start_streaming_pcap())
    with open(os.path.join(project.captures_directory, "test.pcap"), "rb") as f:
        c = f.read()
        assert c == b"hello"


def test_default_capture_file_name(project, compute, async_run):
    node1 = Node(project, compute, "Hello@")
    node2 = Node(project, compute, "w0.rld")

    link = Link(project)
    async_run(link.add_node(node1, 0, 4))
    async_run(link.add_node(node2, 1, 3))
    assert link.default_capture_file_name() == "Hello_0-4_to_w0rld_1-3.pcap"


def test_start_capture(link, async_run, tmpdir, project, controller):
    @asyncio.coroutine
    def fake_reader():
        return AsyncioBytesIO()

    link.read_pcap_from_source = fake_reader
    controller._notification = MagicMock()
    async_run(link.start_capture(capture_file_name="test.pcap"))
    assert link._capturing
    assert link._capture_file_name == "test.pcap"
    controller._notification.emit.assert_called_with("link.updated", link.__json__())


def test_stop_capture(link, async_run, tmpdir, project, controller):
    link._capturing = True
    controller._notification = MagicMock()
    async_run(link.stop_capture())
    assert link._capturing is False
    controller._notification.emit.assert_called_with("link.updated", link.__json__())