#
# 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 IOU nodes.
"""

import os

from fastapi import APIRouter, WebSocket, Depends, Body, 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.iou import IOU
from gns3server.compute.iou.iou_vm import IOUVM

from .dependencies.authentication import compute_authentication, ws_compute_authentication

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

router = APIRouter(responses=responses)


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

    iou_manager = IOU.instance()
    node = iou_manager.get_node(str(node_id), project_id=str(project_id))
    return node


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

    iou = IOU.instance()
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    vm = await iou.create_node(
        node_data.pop("name"),
        str(project_id),
        node_data.get("node_id"),
        application_id=node_data.get("application_id"),
        path=node_data.get("path"),
        console=node_data.get("console"),
        console_type=node_data.get("console_type", "telnet"),
    )

    for name, value in node_data.items():
        if hasattr(vm, name) and getattr(vm, name) != value:
            if name == "application_id":
                continue  # we must ignore this to avoid overwriting the application_id allocated by the controller
            if name == "startup_config_content" and (vm.startup_config_content and len(vm.startup_config_content) > 0):
                continue
            if name == "private_config_content" and (vm.private_config_content and len(vm.private_config_content) > 0):
                continue
            if node_data.get("use_default_iou_values") and (name == "ram" or name == "nvram"):
                continue
            setattr(vm, name, value)
    return vm.asdict()


@router.get(
    "/{node_id}",
    response_model=schemas.IOU,
    dependencies=[Depends(compute_authentication)]
)
def get_iou_node(node: IOUVM = Depends(dep_node)) -> schemas.IOU:
    """
    Return an IOU node.
    """

    return node.asdict()


@router.put(
    "/{node_id}",
    response_model=schemas.IOU,
    dependencies=[Depends(compute_authentication)]
)
async def update_iou_node(node_data: schemas.IOUUpdate, node: IOUVM = Depends(dep_node)) -> schemas.IOU:
    """
    Update an IOU 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:
            if name == "application_id":
                continue  # we must ignore this to avoid overwriting the application_id allocated by the IOU manager
            setattr(node, name, value)

    if node.use_default_iou_values:
        # update the default IOU values in case the image or use_default_iou_values have changed
        # this is important to have the correct NVRAM amount in order to correctly push the configs to the NVRAM
        await node.update_default_iou_values()
    node.updated()
    return node.asdict()


@router.delete(
    "/{node_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def delete_iou_node(node: IOUVM = Depends(dep_node)) -> None:
    """
    Delete an IOU node.
    """

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


@router.post(
    "/{node_id}/duplicate",
    response_model=schemas.IOU,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(compute_authentication)]
)
async def duplicate_iou_node(
        destination_node_id: UUID = Body(..., embed=True),
        node: IOUVM = Depends(dep_node)
) -> schemas.IOU:
    """
    Duplicate an IOU node.
    """

    new_node = await IOU.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_iou_node(start_data: schemas.IOUStart, node: IOUVM = Depends(dep_node)) -> None:
    """
    Start an IOU node.
    """

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

    await node.start()


@router.post(
    "/{node_id}/stop",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def stop_iou_node(node: IOUVM = Depends(dep_node)) -> None:
    """
    Stop an IOU node.
    """

    await node.stop()


@router.post(
    "/{node_id}/suspend",
    dependencies=[Depends(compute_authentication)]
)
def suspend_iou_node(node: IOUVM = Depends(dep_node)) -> None:
    """
    Suspend an IOU node.
    """

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


@router.post(
    "/{node_id}/reload",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def reload_iou_node(node: IOUVM = Depends(dep_node)) -> None:
    """
    Reload an IOU node.
    """

    await node.reload()


@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],
    dependencies=[Depends(compute_authentication)]
)
async def create_iou_node_nio(
    adapter_number: int,
    port_number: int,
    nio_data: Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
    node: IOUVM = Depends(dep_node),
) -> Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO]:
    """
    Add a NIO (Network Input/Output) to the node.
    """

    nio = IOU.instance().create_nio(jsonable_encoder(nio_data, exclude_unset=True))
    await node.adapter_add_nio_binding(adapter_number, 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=Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
    dependencies=[Depends(compute_authentication)]
)
async def update_iou_node_nio(
    adapter_number: int,
    port_number: int,
    nio_data: Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO],
    node: IOUVM = Depends(dep_node),
) -> Union[schemas.EthernetNIO, schemas.TAPNIO, schemas.UDPNIO]:
    """
    Update a NIO (Network Input/Output) on the node.
    """

    nio = node.get_nio(adapter_number, 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.adapter_update_nio_binding(adapter_number, 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_iou_node_nio(adapter_number: int, port_number: int, node: IOUVM = Depends(dep_node)) -> None:
    """
    Delete a NIO (Network Input/Output) from the node.
    """

    await node.adapter_remove_nio_binding(adapter_number, port_number)


@router.post(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/capture/start",
    dependencies=[Depends(compute_authentication)]
)
async def start_iou_node_capture(
        adapter_number: int,
        port_number: int,
        node_capture_data: schemas.NodeCapture,
        node: IOUVM = Depends(dep_node)
) -> dict:
    """
    Start a packet capture on the node.
    """

    pcap_file_path = os.path.join(node.project.capture_working_directory(), node_capture_data.capture_file_name)
    await node.start_capture(adapter_number, port_number, pcap_file_path, node_capture_data.data_link_type)
    return {"pcap_file_path": str(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_iou_node_capture(adapter_number: int, port_number: int, node: IOUVM = Depends(dep_node)) -> None:
    """
    Stop a packet capture on the node.
    """

    await node.stop_capture(adapter_number, 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,
        port_number: int,
        node: IOUVM = Depends(dep_node)
) -> StreamingResponse:
    """
    Stream the pcap capture file.
    """

    nio = node.get_nio(adapter_number, port_number)
    stream = IOU.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: IOUVM = Depends(dep_node)
) -> None:
    """
    Console WebSocket.
    """

    if 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: IOUVM = Depends(dep_node)) -> None:

    await node.reset_console()


@router.put(
    "/{node_id}/markers/{marker_name}",
    dependencies=[Depends(compute_authentication)]
)
async def toggle_iou_marker(
    marker_name: str,
    toggle_data: schemas.MarkerToggle,
    node: IOUVM = 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_iou_markers(node: IOUVM = 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_iou_markers(node: IOUVM = 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_iou_marker_capture(
    marker_name: str,
    adapter_number: int,
    port_number: int,
    link_id: str = "",
    node: IOUVM = 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(adapter_number, 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_iou_marker(
    marker_name: str,
    rebuild_data: schemas.MarkerRebuild,
    node: IOUVM = 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}
