#
# Copyright (C) 2020 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/>.

"""
API routes for cloud nodes.
"""

import os

from fastapi import APIRouter, Depends, Path, status, HTTPException
from fastapi.encoders import jsonable_encoder
from fastapi.responses import StreamingResponse
from typing import Union
from uuid import UUID

from gns3server import schemas
from gns3server.compute.builtin import Builtin
from gns3server.compute.builtin.nodes.cloud import Cloud

responses = {404: {"model": schemas.ErrorMessage, "description": "Could not find project or cloud node"}}

router = APIRouter(responses=responses)


def dep_node(project_id: UUID, node_id: UUID) -> Cloud:
    """
    Dependency to retrieve a node.
    """

    builtin_manager = Builtin.instance()
    node = builtin_manager.get_node(str(node_id), project_id=str(project_id))
    return node


@router.post(
    "",
    response_model=schemas.Cloud,
    status_code=status.HTTP_201_CREATED,
    responses={409: {"model": schemas.ErrorMessage, "description": "Could not create cloud node"}},
)
async def create_cloud(project_id: UUID, node_data: schemas.CloudCreate) -> schemas.Cloud:
    """
    Create a new cloud node.
    """

    builtin_manager = Builtin.instance()
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    node = await builtin_manager.create_node(
        node_data.pop("name"),
        str(project_id),
        node_data.get("node_id"),
        node_type="cloud",
        ports=node_data.get("ports_mapping"),
    )

    # add the remote console settings
    node.remote_console_host = node_data.get("remote_console_host", node.remote_console_host)
    node.remote_console_port = node_data.get("remote_console_port", node.remote_console_port)
    node.remote_console_type = node_data.get("remote_console_type", node.remote_console_type)
    node.remote_console_http_path = node_data.get("remote_console_http_path", node.remote_console_http_path)
    node.usage = node_data.get("usage", "")
    return node.asdict()


@router.get("/{node_id}", response_model=schemas.Cloud)
def get_cloud(node: Cloud = Depends(dep_node)) -> schemas.Cloud:
    """
    Return a cloud node.
    """

    return node.asdict()


@router.put("/{node_id}", response_model=schemas.Cloud)
async def update_cloud(node_data: schemas.CloudUpdate, node: Cloud = Depends(dep_node)) -> schemas.Cloud:
    """
    Update a cloud node.
    """

    node_data = jsonable_encoder(node_data, exclude_unset=True)
    for name, value in node_data.items():
        if hasattr(node, name) and getattr(node, name) != value:
            setattr(node, name, value)
    node.updated()
    return node.asdict()


@router.delete("/{node_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_cloud(node: Cloud = Depends(dep_node)) -> None:
    """
    Delete a cloud node.
    """

    await Builtin.instance().delete_node(node.id)


@router.post("/{node_id}/start", status_code=status.HTTP_204_NO_CONTENT)
async def start_cloud(node: Cloud = Depends(dep_node)) -> None:
    """
    Start a cloud node.
    """

    await node.start()


@router.post("/{node_id}/stop", status_code=status.HTTP_204_NO_CONTENT)
async def stop_cloud(node: Cloud = Depends(dep_node)) -> None:
    """
    Stop a cloud node.
    """

    raise HTTPException(
        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
        detail="Stop is not supported for cloud nodes"
    )


@router.post("/{node_id}/suspend", status_code=status.HTTP_204_NO_CONTENT)
async def suspend_cloud(node: Cloud = Depends(dep_node)) -> None:
    """
    Suspend a cloud node.
    This endpoint results in no action since cloud nodes cannot be suspended.
    """

    raise HTTPException(
        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
        detail="Suspend is not supported for cloud nodes"
    )


@router.post(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/nio",
    status_code=status.HTTP_201_CREATED,
    response_model=Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
)
async def create_cloud_nio(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        nio_data: Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
        node: Cloud = Depends(dep_node),
) -> Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO]:
    """
    Add a NIO (Network Input/Output) to the node.
    The adapter number on the cloud is always 0.
    """

    nio = Builtin.instance().create_nio(jsonable_encoder(nio_data, exclude_unset=True))
    await node.add_nio(nio, port_number)
    return nio.asdict()


@router.put(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/nio",
    status_code=status.HTTP_201_CREATED,
    response_model=Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
)
async def update_cloud_nio(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        nio_data: Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
        node: Cloud = Depends(dep_node),
) -> Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO]:
    """
    Update a NIO (Network Input/Output) to the node.
    The adapter number on the cloud is always 0.
    """

    nio = node.get_nio(port_number)
    nio.filters.clear()
    if nio_data.filters:
        nio.filters = nio_data.filters
    # NIO type is a Union (Ethernet/TAP/UDP); only UDPNIO carries markers.
    nio.markers = getattr(nio_data, "markers", None) or {}
    await node.update_nio(port_number, nio)
    return nio.asdict()


@router.delete("/{node_id}/adapters/{adapter_number}/ports/{port_number}/nio", status_code=status.HTTP_204_NO_CONTENT)
async def delete_cloud_nio(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        node: Cloud = Depends(dep_node)
) -> None:
    """
    Remove a NIO (Network Input/Output) from the node.
    The adapter number on the cloud is always 0.
    """

    await node.remove_nio(port_number)


@router.post("/{node_id}/adapters/{adapter_number}/ports/{port_number}/capture/start")
async def start_cloud_capture(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        node_capture_data: schemas.NodeCapture,
        node: Cloud = Depends(dep_node)
) -> dict:
    """
    Start a packet capture on the node.
    The adapter number on the cloud is always 0.
    """

    pcap_file_path = os.path.join(node.project.capture_working_directory(), node_capture_data.capture_file_name)
    await node.start_capture(port_number, pcap_file_path, node_capture_data.data_link_type)
    return {"pcap_file_path": pcap_file_path}


@router.post(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/capture/stop", status_code=status.HTTP_204_NO_CONTENT
)
async def stop_cloud_capture(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        node: Cloud = Depends(dep_node)
) -> None:
    """
    Stop a packet capture on the node.
    The adapter number on the cloud is always 0.
    """

    await node.stop_capture(port_number)


@router.get("/{node_id}/adapters/{adapter_number}/ports/{port_number}/capture/stream")
async def stream_pcap_file(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        node: Cloud = Depends(dep_node)
) -> StreamingResponse:
    """
    Stream the pcap capture file.
    The adapter number on the cloud is always 0.
    """

    nio = node.get_nio(port_number)
    stream = Builtin.instance().stream_pcap_file(nio, node.project.id)
    return StreamingResponse(stream, media_type="application/vnd.tcpdump.pcap")


@router.put(
    "/{node_id}/markers/{marker_name}"
)
async def toggle_cloud_marker(
    marker_name: str,
    toggle_data: schemas.MarkerToggle,
    node: Cloud = Depends(dep_node)
) -> dict:
    """
    Toggle a marker filter on/off without an NIO rebuild (ubridge contract §3.2).
    """

    if not any(n == marker_name for (n, lid) in node._marker_filter_bridges):
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Marker '{marker_name}' is not installed on this node",
        )
    await node._ubridge_set_marker_filter_state(marker_name, toggle_data.enabled)
    return {"marker_name": marker_name, "enabled": toggle_data.enabled}


@router.post(
    "/{node_id}/markers/pause",
    status_code=status.HTTP_204_NO_CONTENT
)
async def pause_cloud_markers(node: Cloud = Depends(dep_node)) -> None:

    await node._ubridge_marker_pause()


@router.post(
    "/{node_id}/markers/resume",
    status_code=status.HTTP_204_NO_CONTENT
)
async def resume_cloud_markers(node: Cloud = Depends(dep_node)) -> None:

    await node._ubridge_marker_resume()


@router.delete(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/markers/{marker_name}",
    status_code=status.HTTP_204_NO_CONTENT
)
async def delete_cloud_marker_capture(
    *,
    marker_name: str,
    adapter_number: int = Path(..., ge=0, le=0),
    port_number: int,
    link_id: str = "",
    node: Cloud = Depends(dep_node)
) -> None:
    """
    Delete a marker's capture pcap (called by the controller when the marker is
    removed) so the file is cleaned up even with the node stopped. Also drops
    the marker from the port NIO's cached spec so a node restart won't reinstall
    it (and recreate an empty pcap).
    """

    nio = node.get_nio(port_number)
    await node.delete_marker_capture(marker_name, link_id, nio)


@router.put("/{node_id}/markers/{marker_name}/rebuild")
async def rebuild_cloud_marker(
    marker_name: str,
    rebuild_data: schemas.MarkerRebuild,
    node: Cloud = Depends(dep_node)
) -> dict:
    """
    Re-install a single marker filter with new BPF/tag/direction (delete + add,
    no bridge reset) so sibling markers' pcaps stay open.
    """

    await node.rebuild_marker_filter(
        marker_name, rebuild_data.link_id, rebuild_data.bpf,
        rebuild_data.tag, rebuild_data.direction, rebuild_data.enabled,
    )
    return {"marker_name": marker_name}