#
# 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 Qemu 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 import qemu
from gns3server.compute.qemu import Qemu
from gns3server.compute.qemu.qemu_vm import QemuVM
from .dependencies.authentication import compute_authentication, ws_compute_authentication

import logging
log = logging.getLogger(__name__)

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

router = APIRouter(responses=responses)


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

    qemu_manager = Qemu.instance()
    node = qemu_manager.get_node(str(node_id), project_id=str(project_id))
    return node


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

    qemu = Qemu.instance()
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    vm = await qemu.create_node(
        node_data.pop("name"),
        str(project_id),
        node_data.pop("node_id", None),
        linked_clone=node_data.get("linked_clone", True),
        qemu_path=node_data.pop("qemu_path", None),
        console=node_data.pop("console", None),
        console_type=node_data.pop("console_type", "telnet"),
        aux=node_data.get("aux"),
        aux_type=node_data.pop("aux_type", "none"),
        platform=node_data.pop("platform", None),
    )

    # update the disk image with the backing file if provided
    # this is needed when duplicating a node that uses backed disk images
    drives = ["a", "b", "c", "d"]
    for disk_index, drive in enumerate(drives):
        disk_image_backing_file = node_data.get(f"hd{drive}_disk_image_backing_file")
        if disk_image_backing_file:
            log.debug(f"Updating disk image for drive {drive} with backing file {disk_image_backing_file}")
            node_data[f"hd{drive}_disk_image"] = disk_image_backing_file

    for name, value in node_data.items():
        if hasattr(vm, name) and getattr(vm, name) != value:
            setattr(vm, name, value)

    return vm.asdict()


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

    return node.asdict()


@router.put(
    "/{node_id}",
    response_model=schemas.Qemu,
    dependencies=[Depends(compute_authentication)]
)
async def update_qemu_node(node_data: schemas.QemuUpdate, node: QemuVM = Depends(dep_node)) -> schemas.Qemu:
    """
    Update a Qemu node.
    """

    node_data = jsonable_encoder(node_data, exclude_unset=True)
    # update the console first to avoid issue if updating console type
    node.console = node_data.pop("console", node.console)
    for name, value in node_data.items():
        if hasattr(node, name) and getattr(node, name) != value:
            await node.update_property(name, value)
    node.updated()
    return node.asdict()


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

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


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

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


@router.post(
    "/{node_id}/disk_image/{disk_name}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def create_qemu_disk_image(
        disk_name: str,
        disk_data: schemas.QemuDiskImageCreate,
        node: QemuVM = Depends(dep_node)
) -> None:
    """
    Create a Qemu disk image.
    """

    options = jsonable_encoder(disk_data, exclude_unset=True)
    await node.create_disk_image(disk_name, options)


@router.put(
    "/{node_id}/disk_image/{disk_name}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def update_qemu_disk_image(
        disk_name: str,
        disk_data: schemas.QemuDiskImageUpdate,
        node: QemuVM = Depends(dep_node)
) -> None:
    """
    Update a Qemu disk image.
    """

    if disk_data.extend:
        await node.resize_disk_image(disk_name, disk_data.extend)


@router.delete(
    "/{node_id}/disk_image/{disk_name}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def delete_qemu_disk_image(
        disk_name: str,
        node: QemuVM = Depends(dep_node)
) -> None:
    """
    Delete a Qemu disk image.
    """

    node.delete_disk_image(disk_name)


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

    await node.start()


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

    await node.stop()


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

    await node.reload()


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

    await node.suspend()


@router.post(
    "/{node_id}/resume",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def resume_qemu_node(node: QemuVM = Depends(dep_node)) -> None:
    """
    Resume a Qemu node.
    """

    await node.resume()


@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_qemu_node_nio(
        *,
        adapter_number: int,
        port_number: int = Path(..., ge=0, le=0),
        nio_data: schemas.UDPNIO,
        node: QemuVM = Depends(dep_node)
) -> schemas.UDPNIO:
    """
    Add a NIO (Network Input/Output) to the node.
    The port number on the Qemu node is always 0.
    """

    nio = Qemu.instance().create_nio(jsonable_encoder(nio_data, exclude_unset=True))
    await node.adapter_add_nio_binding(adapter_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_qemu_node_nio(
        *,
        adapter_number: int,
        port_number: int = Path(..., ge=0, le=0),
        nio_data: schemas.UDPNIO,
        node: QemuVM = Depends(dep_node)
) -> schemas.UDPNIO:
    """
    Update a NIO (Network Input/Output) on the node.
    The port number on the Qemu node is always 0.
    """

    nio = node.get_nio(adapter_number)
    nio.filters.clear()
    if nio_data.filters:
        nio.filters = nio_data.filters
    nio.suspend = nio_data.suspend
    nio.markers = nio_data.markers or {}
    await node.adapter_update_nio_binding(adapter_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_qemu_node_nio(
        adapter_number: int,
        port_number: int = Path(..., ge=0, le=0),
        node: QemuVM = Depends(dep_node)
) -> None:
    """
    Delete a NIO (Network Input/Output) from the node.
    The port number on the Qemu node is always 0.
    """

    await node.adapter_remove_nio_binding(adapter_number)


@router.post(
    "/{node_id}/adapters/{adapter_number}/ports/{port_number}/capture/start",
    dependencies=[Depends(compute_authentication)]
)
async def start_qemu_node_capture(
        *,
        adapter_number: int,
        port_number: int = Path(..., ge=0, le=0),
        node_capture_data: schemas.NodeCapture,
        node: QemuVM = Depends(dep_node)
) -> dict:
    """
    Start a packet capture on the node.
    The port number on the Qemu 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": 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_qemu_node_capture(
        adapter_number: int,
        port_number: int = Path(..., ge=0, le=0),
        node: QemuVM = Depends(dep_node)
) -> None:
    """
    Stop a packet capture on the node.
    The port number on the Qemu node is always 0.
    """

    await node.stop_capture(adapter_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 = Path(..., ge=0, le=0),
        node: QemuVM = Depends(dep_node)) -> StreamingResponse:
    """
    Stream the pcap capture file.
    The port number on the Qemu node is always 0.
    """

    nio = node.get_nio(adapter_number)
    stream = Qemu.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: QemuVM = Depends(dep_node)
) -> None:
    """
    Console WebSocket.
    """

    if websocket:
        await node.start_websocket_console(websocket)


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

    if websocket:
        await node.start_vnc_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: QemuVM = Depends(dep_node)) -> None:

    await node.reset_console()


@router.put(
    "/{node_id}/markers/{marker_name}",
    dependencies=[Depends(compute_authentication)]
)
async def toggle_qemu_marker(
    marker_name: str,
    toggle_data: schemas.MarkerToggle,
    node: QemuVM = 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_qemu_markers(node: QemuVM = 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_qemu_markers(node: QemuVM = 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_qemu_marker_capture(
    marker_name: str,
    adapter_number: int,
    port_number: int = Path(..., ge=0, le=0),
    link_id: str = "",
    node: QemuVM = 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)
    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_qemu_marker(
    marker_name: str,
    rebuild_data: schemas.MarkerRebuild,
    node: QemuVM = 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}
