# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 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 aiohttp.web import HTTPConflict

from ....web.route import Route
from ....hypervisor.docker import Docker

from ....schemas.docker import (
    DOCKER_CREATE_SCHEMA,
    DOCKER_OBJECT_SCHEMA,
    DOCKER_UPDATE_SCHEMA,
    DOCKER_LIST_IMAGES_SCHEMA
)
from ....schemas.vm import VM_CAPTURE_SCHEMA
from ....schemas.nio import NIO_SCHEMA


class DockerHandler:
    """API entry points for Docker."""

    @classmethod
    @Route.get(
        r"/docker/images",
        status_codes={
            200: "Success",
        },
        output=DOCKER_LIST_IMAGES_SCHEMA,
        description="Get all available Docker images")
    def show(request, response):
        docker_manager = Docker.instance()
        images = yield from docker_manager.list_images()
        response.json(images)

    @classmethod
    @Route.post(
        r"/projects/{project_id}/docker/vms",
        parameters={
            "project_id": "UUID for the project"
        },
        status_codes={
            201: "Instance created",
            400: "Invalid request",
            409: "Conflict"
        },
        description="Create a new Docker container",
        input=DOCKER_CREATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def create(request, response):
        docker_manager = Docker.instance()
        container = yield from docker_manager.create_vm(
            request.json.pop("name"),
            request.match_info["project_id"],
            request.json.get("vm_id"),
            image=request.json.pop("image"),
            start_command=request.json.get("start_command"),
            environment=request.json.get("environment"),
            adapters=request.json.get("adapters"),
            console=request.json.get("console"),
            console_type=request.json.get("console_type"),
            aux=request.json.get("aux")
        )
        for name, value in request.json.items():
            if name != "_vm_id":
                if hasattr(container, name) and getattr(container, name) != value:
                    setattr(container, name, value)

        response.set_status(201)
        response.json(container)

    @classmethod
    @Route.post(
        r"/projects/{project_id}/docker/vms/{id}/start",
        parameters={
            "project_id": "UUID of the project",
            "id": "ID of the container"
        },
        status_codes={
            204: "Instance started",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Start a Docker container",
        input=DOCKER_CREATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def start(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["id"],
            project_id=request.match_info["project_id"])
        yield from container.start()
        response.set_status(204)

    @classmethod
    @Route.post(
        r"/projects/{project_id}/docker/vms/{id}/stop",
        parameters={
            "project_id": "UUID of the project",
            "id": "ID of the container"
        },
        status_codes={
            204: "Instance stopped",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Stop a Docker container",
        input=DOCKER_CREATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def stop(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["id"],
            project_id=request.match_info["project_id"])
        yield from container.stop()
        response.set_status(204)

    @classmethod
    @Route.post(
        r"/projects/{project_id}/docker/vms/{id}/reload",
        parameters={
            "project_id": "UUID of the project",
            "id": "ID of the container"
        },
        status_codes={
            204: "Instance restarted",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Restart a Docker container",
        input=DOCKER_CREATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def reload(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["id"],
            project_id=request.match_info["project_id"])
        yield from container.restart()
        response.set_status(204)

    @classmethod
    @Route.delete(
        r"/projects/{project_id}/docker/vms/{id}",
        parameters={
            "id": "ID for the container",
            "project_id": "UUID for the project"
        },
        status_codes={
            204: "Instance deleted",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Delete a Docker container")
    def delete(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["id"],
            project_id=request.match_info["project_id"])
        yield from container.delete()
        response.set_status(204)

    @classmethod
    @Route.post(
        r"/projects/{project_id}/docker/vms/{id}/suspend",
        parameters={
            "project_id": "UUID of the project",
            "id": "ID of the container"
        },
        status_codes={
            204: "Instance paused",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Pause a Docker container",
        input=DOCKER_CREATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def suspend(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["id"],
            project_id=request.match_info["project_id"])
        yield from container.pause()
        response.set_status(204)

    @Route.post(
        r"/projects/{project_id}/docker/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio",
        parameters={
            "project_id": "UUID for the project",
            "id": "ID of the container",
            "adapter_number": "Adapter where the nio should be added",
            "port_number": "Port on the adapter"
        },
        status_codes={
            201: "NIO created",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Add a NIO to a Docker container",
        input=NIO_SCHEMA,
        output=NIO_SCHEMA)
    def create_nio(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["vm_id"],
            project_id=request.match_info["project_id"])
        nio_type = request.json["type"]
        if nio_type not in ("nio_udp"):
            raise HTTPConflict(
                text="NIO of type {} is not supported".format(nio_type))
        nio = docker_manager.create_nio(
            int(request.match_info["adapter_number"]), request.json)
        adapter = container._ethernet_adapters[
            int(request.match_info["adapter_number"])
        ]
        yield from container.adapter_add_nio_binding(
            int(request.match_info["adapter_number"]), nio)
        response.set_status(201)
        response.json(nio)

    @classmethod
    @Route.delete(
        r"/projects/{project_id}/docker/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio",
        parameters={
            "project_id": "UUID for the project",
            "id": "ID of the container",
            "adapter_number": "Adapter where the nio should be added",
            "port_number": "Port on the adapter"
        },
        status_codes={
            204: "NIO deleted",
            400: "Invalid request",
            404: "Instance doesn't exist"
        },
        description="Remove a NIO from a Docker container")
    def delete_nio(request, response):
        docker_manager = Docker.instance()
        container = docker_manager.get_vm(
            request.match_info["vm_id"],
            project_id=request.match_info["project_id"])
        yield from container.adapter_remove_nio_binding(
            int(request.match_info["adapter_number"]))
        response.set_status(204)

    @classmethod
    @Route.put(
        r"/projects/{project_id}/docker/vms/{vm_id}",
        parameters={
            "project_id": "UUID for the project",
            "vm_id": "UUID for the instance"
        },
        status_codes={
            200: "Instance updated",
            400: "Invalid request",
            404: "Instance doesn't exist",
            409: "Conflict"
        },
        description="Update a Docker instance",
        input=DOCKER_UPDATE_SCHEMA,
        output=DOCKER_OBJECT_SCHEMA)
    def update(request, response):

        docker_manager = Docker.instance()
        vm = docker_manager.get_vm(request.match_info["vm_id"], project_id=request.match_info["project_id"])
        vm.name = request.json.get("name", vm.name)
        vm.console = request.json.get("console", vm.console)
        vm.start_command = request.json.get("start_command", vm.start_command)
        vm.environment = request.json.get("environment", vm.environment)
        yield from vm.update()
        response.json(vm)

    @Route.post(
        r"/projects/{project_id}/docker/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/start_capture",
        parameters={
            "project_id": "UUID for the project",
            "vm_id": "UUID for the instance",
            "adapter_number": "Adapter to start a packet capture",
            "port_number": "Port on the adapter"
        },
        status_codes={
            200: "Capture started",
            400: "Invalid request",
            404: "Instance doesn't exist",
            409: "VM not started"
        },
        description="Start a packet capture on a IOU VM instance",
        input=VM_CAPTURE_SCHEMA)
    def start_capture(request, response):

        docker_manager = Docker.instance()
        vm = docker_manager.get_vm(request.match_info["vm_id"], project_id=request.match_info["project_id"])
        adapter_number = int(request.match_info["adapter_number"])
        pcap_file_path = os.path.join(vm.project.capture_working_directory(), request.json["capture_file_name"])

        if not vm.is_running():
            raise HTTPConflict(text="Cannot capture traffic on a non started VM")
        yield from vm.start_capture(adapter_number, pcap_file_path)
        response.json({"pcap_file_path": str(pcap_file_path)})

    @Route.post(
        r"/projects/{project_id}/docker/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/stop_capture",
        parameters={
            "project_id": "UUID for the project",
            "vm_id": "UUID for the instance",
            "adapter_number": "Adapter to stop a packet capture",
            "port_number": "Port on the adapter (always 0)"
        },
        status_codes={
            204: "Capture stopped",
            400: "Invalid request",
            404: "Instance doesn't exist",
            409: "VM not started"
        },
        description="Stop a packet capture on a IOU VM instance")
    def stop_capture(request, response):

        docker_manager = Docker.instance()
        vm = docker_manager.get_vm(request.match_info["vm_id"], project_id=request.match_info["project_id"])

        if not vm.is_running():
            raise HTTPConflict(text="Cannot capture traffic on a non started VM")

        adapter_number = int(request.match_info["adapter_number"])
        yield from vm.stop_capture(adapter_number)
        response.set_status(204)