import { Type } from "@sinclair/typebox";

import type { ClawdbotConfig } from "../../config/config.js";
import { scheduleGatewaySigusr1Restart } from "../../infra/restart.js";
import { type AnyAgentTool, jsonResult, readStringParam } from "./common.js";
import { callGatewayTool } from "./gateway.js";

const GATEWAY_ACTIONS = [
  "restart",
  "config.get",
  "config.schema",
  "config.apply",
  "update.run",
] as const;

type GatewayAction = (typeof GATEWAY_ACTIONS)[number];

// NOTE: Using a flattened object schema instead of Type.Union([Type.Object(...), ...])
// because Claude API on Vertex AI rejects nested anyOf schemas as invalid JSON Schema.
// The discriminator (action) determines which properties are relevant; runtime validates.
const GatewayToolSchema = Type.Object({
  action: Type.Unsafe<GatewayAction>({
    type: "string",
    enum: [...GATEWAY_ACTIONS],
  }),
  // restart
  delayMs: Type.Optional(Type.Number()),
  reason: Type.Optional(Type.String()),
  // config.get, config.schema, config.apply, update.run
  gatewayUrl: Type.Optional(Type.String()),
  gatewayToken: Type.Optional(Type.String()),
  timeoutMs: Type.Optional(Type.Number()),
  // config.apply
  raw: Type.Optional(Type.String()),
  // config.apply, update.run
  sessionKey: Type.Optional(Type.String()),
  note: Type.Optional(Type.String()),
  restartDelayMs: Type.Optional(Type.Number()),
});
// Keep top-level object schemas while enforcing conditional requirements.
(GatewayToolSchema as typeof GatewayToolSchema & { allOf?: unknown[] }).allOf =
  [
    {
      if: {
        properties: {
          action: { const: "config.apply" },
        },
        required: ["action"],
      },
      // biome-ignore lint/suspicious/noThenProperty: JSON Schema keyword.
      then: { required: ["raw"] },
    },
  ];

export function createGatewayTool(opts?: {
  agentSessionKey?: string;
  config?: ClawdbotConfig;
}): AnyAgentTool {
  return {
    label: "Gateway",
    name: "gateway",
    description:
      "Restart, apply config, or update the gateway in-place (SIGUSR1). Use config.apply/update.run to write config or run updates with validation and restart.",
    parameters: GatewayToolSchema,
    execute: async (_toolCallId, args) => {
      const params = args as Record<string, unknown>;
      const action = readStringParam(params, "action", { required: true });
      if (action === "restart") {
        if (opts?.config?.commands?.restart !== true) {
          throw new Error(
            "Gateway restart is disabled. Set commands.restart=true to enable.",
          );
        }
        const delayMs =
          typeof params.delayMs === "number" && Number.isFinite(params.delayMs)
            ? Math.floor(params.delayMs)
            : undefined;
        const reason =
          typeof params.reason === "string" && params.reason.trim()
            ? params.reason.trim().slice(0, 200)
            : undefined;
        console.info(
          `gateway tool: restart requested (delayMs=${delayMs ?? "default"}, reason=${reason ?? "none"})`,
        );
        const scheduled = scheduleGatewaySigusr1Restart({
          delayMs,
          reason,
        });
        return jsonResult(scheduled);
      }

      const gatewayUrl =
        typeof params.gatewayUrl === "string" && params.gatewayUrl.trim()
          ? params.gatewayUrl.trim()
          : undefined;
      const gatewayToken =
        typeof params.gatewayToken === "string" && params.gatewayToken.trim()
          ? params.gatewayToken.trim()
          : undefined;
      const timeoutMs =
        typeof params.timeoutMs === "number" &&
        Number.isFinite(params.timeoutMs)
          ? Math.max(1, Math.floor(params.timeoutMs))
          : undefined;
      const gatewayOpts = { gatewayUrl, gatewayToken, timeoutMs };

      if (action === "config.get") {
        const result = await callGatewayTool("config.get", gatewayOpts, {});
        return jsonResult({ ok: true, result });
      }
      if (action === "config.schema") {
        const result = await callGatewayTool("config.schema", gatewayOpts, {});
        return jsonResult({ ok: true, result });
      }
      if (action === "config.apply") {
        const raw = readStringParam(params, "raw", { required: true });
        const sessionKey =
          typeof params.sessionKey === "string" && params.sessionKey.trim()
            ? params.sessionKey.trim()
            : opts?.agentSessionKey?.trim() || undefined;
        const note =
          typeof params.note === "string" && params.note.trim()
            ? params.note.trim()
            : undefined;
        const restartDelayMs =
          typeof params.restartDelayMs === "number" &&
          Number.isFinite(params.restartDelayMs)
            ? Math.floor(params.restartDelayMs)
            : undefined;
        const result = await callGatewayTool("config.apply", gatewayOpts, {
          raw,
          sessionKey,
          note,
          restartDelayMs,
        });
        return jsonResult({ ok: true, result });
      }
      if (action === "update.run") {
        const sessionKey =
          typeof params.sessionKey === "string" && params.sessionKey.trim()
            ? params.sessionKey.trim()
            : opts?.agentSessionKey?.trim() || undefined;
        const note =
          typeof params.note === "string" && params.note.trim()
            ? params.note.trim()
            : undefined;
        const restartDelayMs =
          typeof params.restartDelayMs === "number" &&
          Number.isFinite(params.restartDelayMs)
            ? Math.floor(params.restartDelayMs)
            : undefined;
        const result = await callGatewayTool("update.run", gatewayOpts, {
          sessionKey,
          note,
          restartDelayMs,
          timeoutMs,
        });
        return jsonResult({ ok: true, result });
      }

      throw new Error(`Unknown action: ${action}`);
    },
  };
}