#
# 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 Docker nodes.
"""

import os

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

from gns3server import schemas
from gns3server.compute.docker import Docker
from gns3server.compute.docker.docker_vm import DockerVM
from .dependencies.authentication import compute_authentication, ws_compute_authentication

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

router = APIRouter(responses=responses)


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

    docker_manager = Docker.instance()
    node = docker_manager.get_node(str(node_id), project_id=str(project_id))
    return node


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

    docker_manager = Docker.instance()
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    container = await docker_manager.create_node(
        node_data.pop("name"),
        str(project_id),
        node_data.get("node_id"),
        image=node_data.pop("image"),
        start_command=node_data.get("start_command"),
        environment=node_data.get("environment"),
        adapters=node_data.get("adapters"),
        mac_address=node_data.get("mac_address"),
        console=node_data.get("console"),
        console_type=node_data.get("console_type"),
        console_resolution=node_data.get("console_resolution", "1024x768"),
        console_http_port=node_data.get("console_http_port", 80),
        console_http_path=node_data.get("console_http_path", "/"),
        aux=node_data.get("aux"),
        aux_type=node_data.pop("aux_type", "none"),
        extra_hosts=node_data.get("extra_hosts"),
        extra_volumes=node_data.get("extra_volumes"),
        extra_configs=node_data.get("extra_configs"),
        memory=node_data.get("memory", 0),
        cpus=node_data.get("cpus", 0),
    )
    # Pop keys already consumed by create_node above so the setattr
    # fallback loop below only applies truly extra keys and does not
    # re-trigger console/aux port setter logging.
    for key in (
        "console", "console_type", "console_resolution", "console_http_port",
        "console_http_path", "aux", "aux_type", "start_command", "environment",
        "adapters", "mac_address", "extra_hosts", "extra_volumes", "extra_configs",
        "memory", "cpus",
    ):
        node_data.pop(key, None)
    for name, value in node_data.items():
        if name != "node_id":
            if hasattr(container, name) and getattr(container, name) != value:
                setattr(container, name, value)

    return container.asdict()


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

    return node.asdict()


@router.put(
    "/{node_id}",
    response_model=schemas.Docker,
    dependencies=[Depends(compute_authentication)]
)
async def update_docker_node(node_data: schemas.DockerUpdate, node: DockerVM = Depends(dep_node)) -> schemas.Docker:
    """
    Update a Docker node.
    """

    props = [
        "name",
        "console",
        "console_type",
        "aux",
        "aux_type",
        "console_resolution",
        "console_http_port",
        "console_http_path",
        "start_command",
        "environment",
        "adapters",
        "mac_address",
        "custom_adapters",
        "extra_hosts",
        "extra_volumes",
        "extra_configs",
        "memory",
        "cpus",
    ]

    changed = False
    node_data = jsonable_encoder(node_data, exclude_unset=True)
    for prop in props:
        if prop in node_data and node_data[prop] != getattr(node, prop):
            setattr(node, prop, node_data[prop])
            changed = True
    # We don't call container.update for nothing because it will restart the container
    if changed:
        await node.update()
    node.updated()
    return node.asdict()


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

    await node.start()


@router.post(
    "/{node_id}/stop",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def stop_docker_node(node: DockerVM = Depends(dep_node)) -> None:
    """
    Stop a Docker node. This is the explicit user stop — the only path that
    asks for a graceful SIGTERM shutdown (vendor NOS override); internal
    paths (delete/update/close) keep the immediate kill.
    """

    await node.stop(graceful=True)


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

    await node.pause()


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

    await node.restart()


@router.post(
    "/{node_id}/pause",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def pause_docker_node(node: DockerVM = Depends(dep_node)) -> None:
    """
    Pause a Docker node.
    """

    await node.pause()


@router.post(
    "/{node_id}/unpause",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(compute_authentication)]
)
async def unpause_docker_node(node: DockerVM = Depends(dep_node)) -> None:
    """
    Unpause a Docker node.
    """

    await node.unpause()


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

    await node.delete()
    await node.project.remove_node(node)


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

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


@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_docker_node_nio(
    adapter_number: int, port_number: int, nio_data: schemas.UDPNIO, node: DockerVM = Depends(dep_node)
) -> schemas.UDPNIO:
    """
    Add a NIO (Network Input/Output) to the node.
    The port number on the Docker node is always 0.
    """

    nio = Docker.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_docker_node_nio(
    adapter_number: int, port_number: int, nio_data: schemas.UDPNIO, node: DockerVM = Depends(dep_node)
) -> schemas.UDPNIO:
    """
    Update a NIO (Network Input/Output) on the node.
    The port number on the Docker node is always 0.
    """

    nio = node.get_nio(adapter_number)
    nio.filters.clear()
    if nio_data.filters:
        nio.filters = nio_data.filters
    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_docker_node_nio(
        adapter_number: int,
        port_number: int,
        node: DockerVM = Depends(dep_node)
) -> None:
    """
    Delete a NIO (Network Input/Output) from the node.
    The port number on the Docker 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_docker_node_capture(
        adapter_number: int,
        port_number: int,
        node_capture_data: schemas.NodeCapture,
        node: DockerVM = Depends(dep_node)
) -> dict:
    """
    Start a packet capture on the node.
    The port number on the Docker 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_docker_node_capture(
        adapter_number: int,
        port_number: int,
        node: DockerVM = Depends(dep_node)
) -> None:
    """
    Stop a packet capture on the node.
    The port number on the Docker 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,
        node: DockerVM = Depends(dep_node)
) -> StreamingResponse:
    """
    Stream the pcap capture file.
    The port number on the Docker node is always 0.
    """

    nio = node.get_nio(adapter_number)
    stream = Docker.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: DockerVM = 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: DockerVM = 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: DockerVM = Depends(dep_node)) -> None:

    await node.reset_console()


@router.put(
    "/{node_id}/markers/{marker_name}",
    dependencies=[Depends(compute_authentication)]
)
async def toggle_docker_marker(
    marker_name: str,
    toggle_data: schemas.MarkerToggle,
    node: DockerVM = 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_docker_markers(node: DockerVM = 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_docker_markers(node: DockerVM = 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_docker_marker_capture(
    marker_name: str,
    adapter_number: int,
    port_number: int,
    link_id: str = "",
    node: DockerVM = 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_docker_marker(
    marker_name: str,
    rebuild_data: schemas.MarkerRebuild,
    node: DockerVM = 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}