#
# 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 VPCS nodes.
"""

import os

from fastapi import APIRouter, WebSocket, Depends, Body, 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.vpcs import VPCS
from gns3server.compute.vpcs.vpcs_vm import VPCSVM
from .dependencies.authentication import compute_authentication, ws_compute_authentication

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

router = APIRouter(responses=responses)


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

    vpcs_manager = VPCS.instance()
    node = vpcs_manager.get_node(str(node_id), project_id=str(project_id))
    return node


@router.post(
    "",
    response_model=schemas.VPCS,
    status_code=status.HTTP_201_CREATED,
    responses={409: {"model": schemas.ErrorMessage, "description": "Could not create VMware node"}},
    dependencies=[Depends(compute_authentication)]
)
async def create_vpcs_node(project_id: UUID, node_data: schemas.VPCSCreate) -> schemas.VPCS:
    """
    Create a new VPCS node.
    """

    vpcs = VPCS.instance()
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    vm = await vpcs.create_node(
        node_data["name"],
        str(project_id),
        node_data.get("node_id"),
        console=node_data.get("console"),
        console_type=node_data.get("console_type", "telnet"),
        startup_script=node_data.get("startup_script"),
    )

    return vm.asdict()


@router.get(
    "/{node_id}",
    response_model=schemas.VPCS,
    dependencies=[Depends(compute_authentication)]
)
def get_vpcs_node(node: VPCSVM = Depends(dep_node)) -> schemas.VPCS:
    """
    Return a VPCS node.
    """

    return node.asdict()


@router.put(
    "/{node_id}",
    response_model=schemas.VPCS,
    dependencies=[Depends(compute_authentication)]
)
async def update_vpcs_node(node_data: schemas.VPCSUpdate, node: VPCSVM = Depends(dep_node)) -> schemas.VPCS:
    """
    Update a VPCS node.
    """

    node_data = jsonable_encoder(node_data, exclude_unset=True)
    name = node_data.get("name", node.name)
    if node.name != name:
        node.name = name
    console = node_data.get("console", node.console)
    if node.console != console:
        node.console = console
    console_type = node_data.get("console_type", node.console_type)
    if node.console_type != console_type:
        node.console_type = console_type
    node.updated()
    return node.asdict()


@router.delete(
    "/{node_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def delete_vpcs_node(node: VPCSVM = Depends(dep_node)) -> None:
    """
    Delete a VPCS node.
    """

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


@router.post(
    "/{node_id}/duplicate",
    response_model=schemas.VPCS,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(compute_authentication)]
)
async def duplicate_vpcs_node(
        destination_node_id: UUID = Body(..., embed=True),
        node: VPCSVM = Depends(dep_node)) -> None:
    """
    Duplicate a VPCS node.
    """

    new_node = await VPCS.instance().duplicate_node(node.id, str(destination_node_id))
    return new_node.asdict()


@router.post(
    "/{node_id}/start",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def start_vpcs_node(node: VPCSVM = Depends(dep_node)) -> None:
    """
    Start a VPCS node.
    """

    await node.start()


@router.post(
    "/{node_id}/stop",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def stop_vpcs_node(node: VPCSVM = Depends(dep_node)) -> None:
    """
    Stop a VPCS node.
    """

    await node.stop()


@router.post(
    "/{node_id}/suspend",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def suspend_vpcs_node(node: VPCSVM = Depends(dep_node)) -> None:
    """
    Suspend a VPCS node.
    """

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


@router.post(
    "/{node_id}/reload",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def reload_vpcs_node(node: VPCSVM = Depends(dep_node)) -> None:
    """
    Reload a VPCS node.
    """

    await node.reload()


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

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


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

    nio = node.get_nio(port_number)
    nio.filters.clear()
    if nio_data.filters:
        nio.filters = nio_data.filters
    nio.markers = nio_data.markers or {}
    await node.port_update_nio_binding(port_number, nio)
    return nio.asdict()


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

    await node.port_remove_nio_binding(port_number)


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

    pcap_file_path = os.path.join(node.project.capture_working_directory(), node_capture_data.capture_file_name)
    await node.start_capture(adapter_number, pcap_file_path)
    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,
    dependencies=[Depends(compute_authentication)]
)
async def stop_vpcs_node_capture(
        *,
        adapter_number: int = Path(..., ge=0, le=0),
        port_number: int,
        node: VPCSVM = Depends(dep_node)
) -> None:
    """
    Stop a packet capture on the node.
    The adapter number on the VPCS node is always 0.
    """

    await node.stop_capture(port_number)



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

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


@router.websocket(
    "/{node_id}/console/ws"
)
async def console_ws(
        websocket: Union[None, WebSocket] = Depends(ws_compute_authentication),
        node: VPCSVM = Depends(dep_node)) -> None:
    """
    Console WebSocket.
    """

    await node.start_websocket_console(websocket)


@router.post(
    "/{node_id}/console/reset",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def reset_console(node: VPCSVM = Depends(dep_node)) -> None:

    await node.reset_console()


@router.put(
    "/{node_id}/markers/{marker_name}",
    dependencies=[Depends(compute_authentication)]
)
async def toggle_vpcs_marker(
    marker_name: str,
    toggle_data: schemas.MarkerToggle,
    node: VPCSVM = 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,
    dependencies=[Depends(compute_authentication)]
)
async def pause_vpcs_markers(node: VPCSVM = Depends(dep_node)) -> None:

    await node._ubridge_marker_pause()


@router.post(
    "/{node_id}/markers/resume",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def resume_vpcs_markers(node: VPCSVM = 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,
    dependencies=[Depends(compute_authentication)]
)
async def delete_vpcs_marker_capture(
    *,
    marker_name: str,
    adapter_number: int = Path(..., ge=0, le=0),
    port_number: int,
    link_id: str = "",
    node: VPCSVM = 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",
    dependencies=[Depends(compute_authentication)]
)
async def rebuild_vpcs_marker(
    marker_name: str,
    rebuild_data: schemas.MarkerRebuild,
    node: VPCSVM = 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}