"""DHCP server tools: leases, server config, static mappings."""

from __future__ import annotations

import json
from typing import Any

from mcp.server.fastmcp import FastMCP

from pfsense_mcp.audit import audit_log
from pfsense_mcp.client import get_client
from pfsense_mcp.config import settings
from pfsense_mcp.guards import is_dry_run_response, require_writes


def register(mcp: FastMCP) -> None:
    @mcp.tool()
    def pfsense_list_dhcp_leases(limit: int = 200, offset: int = 0, query: str = "", target: str = "", url: str = "", api_key: str = "", verify_ssl: bool | None = None) -> str:
        """List DHCP leases. query example: 'hostname__contains=nas' or 'ip__contains=10.77'."""
        client = get_client(target=target, url=url, api_key=api_key, verify_ssl=verify_ssl)
        result = client.get(
            "status/dhcp_server/leases", params=client.list_params(limit, offset, query)
        )
        return json.dumps(result, indent=2, default=str)

    @mcp.tool()
    def pfsense_list_dhcp_servers(limit: int = 50, offset: int = 0, target: str = "", url: str = "", api_key: str = "", verify_ssl: bool | None = None) -> str:
        """List DHCP server configurations per interface (ranges, options, enabled state)."""
        client = get_client(target=target, url=url, api_key=api_key, verify_ssl=verify_ssl)
        result = client.get("services/dhcp_servers", params={"limit": limit, "offset": offset})
        return json.dumps(result, indent=2, default=str)

    @mcp.tool()
    def pfsense_list_dhcp_static_mappings(
        interface_id: str, limit: int = 200, offset: int = 0,
        target: str = "", url: str = "", api_key: str = "", verify_ssl: bool | None = None,
    ) -> str:
        """List DHCP static mappings (reservations) for a DHCP server. interface_id: parent interface (e.g. 'lan')."""
        client = get_client(target=target, url=url, api_key=api_key, verify_ssl=verify_ssl)
        result = client.get(
            "services/dhcp_server/static_mappings",
            params={"parent_id": interface_id, "limit": limit, "offset": offset},
        )
        return json.dumps(result, indent=2, default=str)

    @mcp.tool()
    def pfsense_add_dhcp_static_mapping(
        interface_id: str,
        mac: str,
        ip: str,
        hostname: str = "",
        description: str = "",
        target: str = "",
        url: str = "",
        api_key: str = "",
        verify_ssl: bool | None = None,
    ) -> str:
        """Add a DHCP static mapping (reservation) on an interface's DHCP server."""
        payload: dict[str, Any] = {
            "parent_id": interface_id,
            "mac": mac,
            "ipaddr": ip,
            "hostname": hostname,
            "descr": description,
        }
        if settings.dry_run:
            return json.dumps(is_dry_run_response("add_dhcp_static_mapping", payload), indent=2)
        require_writes("add_dhcp_static_mapping", payload)
        client = get_client(target=target, url=url, api_key=api_key, verify_ssl=verify_ssl)
        result = client.post("services/dhcp_server/static_mapping", data=payload)
        audit_log("add_dhcp_static_mapping", payload | {"result": result})
        return json.dumps(result, indent=2, default=str)

    @mcp.tool()
    def pfsense_delete_dhcp_static_mapping(interface_id: str, mapping_id: int, target: str = "", url: str = "", api_key: str = "", verify_ssl: bool | None = None) -> str:
        """Delete a DHCP static mapping by id."""
        payload = {"parent_id": interface_id, "id": mapping_id}
        if settings.dry_run:
            return json.dumps(is_dry_run_response("delete_dhcp_static_mapping", payload), indent=2)
        require_writes("delete_dhcp_static_mapping", payload)
        client = get_client(target=target, url=url, api_key=api_key, verify_ssl=verify_ssl)
        result = client.delete("services/dhcp_server/static_mapping", params=payload)
        audit_log("delete_dhcp_static_mapping", payload | {"result": result})
        return json.dumps(result, indent=2, default=str)