from __future__ import annotations

from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.responses import Response
from pydantic import BaseModel
from sqlalchemy.engine import Connection

from core.servers.schemas import (
    CreateServerRequest, StopServerRequest, UpdateServerRequest,
)
from core.servers.service import ServerService
from database import get_db
from dependencies import get_current_user, require_admin

router = APIRouter(prefix="/servers", tags=["servers"])


def _ok(data):
    return {"success": True, "data": data, "error": None}


class SendCommandRequest(BaseModel):
    command: str


# ── Server CRUD ──────────────────────────────────────────────────────────────

@router.get("")
def list_servers(
    game_type: str | None = None,
    db: Annotated[Connection, Depends(get_db)] = None,
    _user: Annotated[dict, Depends(get_current_user)] = None,
):
    return _ok(ServerService(db).list_servers(game_type))


@router.post("", status_code=201)
def create_server(
    body: CreateServerRequest,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).create_server(
        name=body.name,
        game_type=body.game_type,
        exe_path=body.exe_path,
        game_port=body.game_port,
        rcon_port=body.rcon_port,
        description=body.description,
        auto_restart=body.auto_restart,
        max_restarts=body.max_restarts,
    ))


@router.get("/{server_id}")
def get_server(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _user: Annotated[dict, Depends(get_current_user)] = None,
):
    return _ok(ServerService(db).get_server(server_id))


@router.put("/{server_id}")
def update_server(
    server_id: int,
    body: UpdateServerRequest,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).update_server(server_id, **body.model_dump(exclude_none=True)))


@router.delete("/{server_id}", status_code=204)
def delete_server(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    ServerService(db).delete_server(server_id)
    return Response(status_code=204)


# ── Lifecycle ────────────────────────────────────────────────────────────────

@router.post("/{server_id}/start")
def start_server(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).start(server_id))


@router.post("/{server_id}/stop")
def stop_server(
    server_id: int,
    body: StopServerRequest = None,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    force = body.force if body else False
    return _ok(ServerService(db).stop(server_id, force=force))


@router.post("/{server_id}/restart")
def restart_server(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).restart(server_id))


@router.post("/{server_id}/kill")
def kill_server(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).kill(server_id))


# ── Config ───────────────────────────────────────────────────────────────────

@router.get("/{server_id}/config")
def get_config(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _user: Annotated[dict, Depends(get_current_user)] = None,
):
    return _ok(ServerService(db).get_config(server_id))


@router.get("/{server_id}/config/preview")
def get_config_preview(
    server_id: int,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    return _ok(ServerService(db).get_config_preview(server_id))


@router.get("/{server_id}/config/{section}")
def get_config_section(
    server_id: int,
    section: str,
    db: Annotated[Connection, Depends(get_db)] = None,
    _user: Annotated[dict, Depends(get_current_user)] = None,
):
    return _ok(ServerService(db).get_config_section(server_id, section))


@router.put("/{server_id}/config/{section}")
def update_config_section(
    server_id: int,
    section: str,
    body: dict,  # Dynamic — adapter-specific fields
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    expected_version = body.pop("config_version", None)
    return _ok(ServerService(db).update_config_section(
        server_id, section, body, expected_version
    ))


# ── RCon ──────────────────────────────────────────────────────────────────────

@router.post("/{server_id}/rcon/command")
def send_rcon_command(
    server_id: int,
    body: SendCommandRequest,
    db: Annotated[Connection, Depends(get_db)] = None,
    _admin: Annotated[dict, Depends(require_admin)] = None,
):
    """Send an RCon command to a running server."""
    from adapters.registry import GameAdapterRegistry
    from adapters.exceptions import RemoteAdminError
    from core.dal.config_repository import ConfigRepository
    from core.dal.server_repository import ServerRepository

    server = ServerRepository(db).get_by_id(server_id)
    if server is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail={"code": "NOT_FOUND", "message": f"Server {server_id} not found"},
        )

    adapter = GameAdapterRegistry.get(server["game_type"])
    if not adapter.has_capability("remote_admin"):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail={"code": "NOT_SUPPORTED", "message": f"Game type {server['game_type']} does not support RCon"},
        )

    # Get RCon password from config
    remote_admin_factory = adapter.get_remote_admin()
    config_gen = adapter.get_config_generator()
    sensitive = config_gen.get_sensitive_fields("rcon") if "rcon" in config_gen.get_sections() else []
    config_repo = ConfigRepository(db)
    rcon_section = config_repo.get_section(server_id, "rcon", sensitive)
    if not rcon_section or not rcon_section.get("password"):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail={"code": "NO_RCON_PASSWORD", "message": "RCon password not configured for this server"},
        )
    password = rcon_section["password"]

    rcon_port = server.get("rcon_port") or (server["game_port"] + 3)
    client = remote_admin_factory.create_client(
        host="127.0.0.1",
        port=rcon_port,
        password=password,
    )
    try:
        client.connect()
        result = client.send_command(body.command)
        client.disconnect()
    except RemoteAdminError as exc:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail={"code": "RCON_ERROR", "message": f"RCon command failed: {exc}"},
        )
    except Exception as exc:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail={"code": "RCON_ERROR", "message": f"RCon connection failed: {exc}"},
        )

    return _ok({"response": result})