# -*- coding: utf-8 -*-
#
# 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

from gns3server.web.route import Route
from gns3server.schemas.node import NODE_CAPTURE_SCHEMA
from gns3server.schemas.nio import NIO_SCHEMA
from gns3server.compute.builtin import Builtin
from aiohttp.web import HTTPConflict

from gns3server.schemas.nat import (
    NAT_CREATE_SCHEMA,
    NAT_OBJECT_SCHEMA,
    NAT_UPDATE_SCHEMA
)


class NatHandler:

    """
    API entry points for nat
    """

    @Route.post(
        r"/projects/{project_id}/nat/nodes",
        parameters={
            "project_id": "Project UUID"
        },
        status_codes={
            201: "Instance created",
            400: "Invalid request",
            409: "Conflict"
        },
        description="Create a new nat instance",
        input=NAT_CREATE_SCHEMA,
        output=NAT_OBJECT_SCHEMA)
    async def create(request, response):

        builtin_manager = Builtin.instance()
        node = await builtin_manager.create_node(request.json.pop("name"),
                                                      request.match_info["project_id"],
                                                      request.json.get("node_id"),
                                                      node_type="nat",
                                                      ports=request.json.get("ports_mapping"))
        response.set_status(201)
        response.json(node)

    @Route.get(
        r"/projects/{project_id}/nat/nodes/{node_id}",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            200: "Success",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Get a nat instance",
        output=NAT_OBJECT_SCHEMA)
    def show(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        response.json(node)

    @Route.put(
        r"/projects/{project_id}/nat/nodes/{node_id}",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            200: "Instance updated",
            400: "Invalid request",
            404: "Instance doesn't exist",
            409: "Conflict"
        },
        description="Update a nat instance",
        input=NAT_UPDATE_SCHEMA,
        output=NAT_OBJECT_SCHEMA)
    def update(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        for name, value in request.json.items():
            if hasattr(node, name) and getattr(node, name) != value:
                setattr(node, name, value)
        node.updated()
        response.json(node)

    @Route.delete(
        r"/projects/{project_id}/nat/nodes/{node_id}",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            204: "Instance deleted",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Delete a nat instance")
    async def delete(request, response):

        builtin_manager = Builtin.instance()
        await builtin_manager.delete_node(request.match_info["node_id"])
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/start",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            204: "Instance started",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Start a nat")
    def start(request, response):

        Builtin.instance().get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/stop",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            204: "Instance stopped",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Stop a nat")
    def stop(request, response):

        Builtin.instance().get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/suspend",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID"
        },
        status_codes={
            204: "Instance suspended",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Suspend a nat (does nothing)")
    def suspend(request, response):

        Builtin.instance().get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Adapter on the nat (always 0)",
            "port_number": "Port on the nat"
        },
        status_codes={
            201: "NIO created",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Add a NIO to a nat instance",
        input=NIO_SCHEMA,
        output=NIO_SCHEMA)
    async def create_nio(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        nio = builtin_manager.create_nio(request.json)
        port_number = int(request.match_info["port_number"])
        await node.add_nio(nio, port_number)
        response.set_status(201)
        response.json(nio)

    @Route.put(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Network adapter where the nio is located",
            "port_number": "Port from where the nio should be updated"
        },
        status_codes={
            201: "NIO updated",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        input=NIO_SCHEMA,
        output=NIO_SCHEMA,
        description="Update a NIO on a NAT instance")
    async def update_nio(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        port_number = int(request.match_info["port_number"])
        nio = node.get_nio(port_number)
        if "filters" in request.json:
            nio.filters = request.json["filters"]
        await node.update_nio(port_number, nio)
        response.set_status(201)
        response.json(request.json)

    @Route.delete(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Adapter on the nat (always 0)",
            "port_number": "Port on the nat"
        },
        status_codes={
            204: "NIO deleted",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Remove a NIO from a nat instance")
    async def delete_nio(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        port_number = int(request.match_info["port_number"])
        await node.remove_nio(port_number)
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/start_capture",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Adapter on the nat (always 0)",
            "port_number": "Port on the nat"
        },
        status_codes={
            200: "Capture started",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Start a packet capture on a nat instance",
        input=NODE_CAPTURE_SCHEMA)
    async def start_capture(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        port_number = int(request.match_info["port_number"])
        pcap_file_path = os.path.join(node.project.capture_working_directory(), request.json["capture_file_name"])
        await node.start_capture(port_number, pcap_file_path, request.json["data_link_type"])
        response.json({"pcap_file_path": pcap_file_path})

    @Route.post(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/stop_capture",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Adapter on the nat (always 0)",
            "port_number": "Port on the nat"
        },
        status_codes={
            204: "Capture stopped",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Stop a packet capture on a nat instance")
    async def stop_capture(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        port_number = int(request.match_info["port_number"])
        await node.stop_capture(port_number)
        response.set_status(204)

    @Route.get(
        r"/projects/{project_id}/nat/nodes/{node_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/pcap",
        description="Stream the pcap capture file",
        parameters={
            "project_id": "Project UUID",
            "node_id": "Node UUID",
            "adapter_number": "Adapter to steam a packet capture (always 0)",
            "port_number": "Port on the nat"
        },
        status_codes={
            200: "File returned",
            403: "Permission denied",
            404: "The file doesn't exist"
        })
    async def stream_pcap_file(request, response):

        builtin_manager = Builtin.instance()
        node = builtin_manager.get_node(request.match_info["node_id"], project_id=request.match_info["project_id"])
        port_number = int(request.match_info["port_number"])
        nio = node.get_nio(port_number)
        await builtin_manager.stream_pcap_file(nio, node.project.id, request, response)
