import { type Static, Type } from "@sinclair/typebox";
import type { AgentTool, AgentToolResult } from "../../src/types.js";

export interface GetCurrentTimeResult extends AgentToolResult<{
  utcTimestamp: number;
}> {}

export async function getCurrentTime(
  timezone?: string,
): Promise<GetCurrentTimeResult> {
  const date = new Date();
  if (timezone) {
    try {
      const timeStr = date.toLocaleString("en-US", {
        timeZone: timezone,
        dateStyle: "full",
        timeStyle: "long",
      });
      return {
        content: [{ type: "text", text: timeStr }],
        details: { utcTimestamp: date.getTime() },
      };
    } catch (_e) {
      throw new Error(
        `Invalid timezone: ${timezone}. Current UTC time: ${date.toISOString()}`,
      );
    }
  }
  const timeStr = date.toLocaleString("en-US", {
    dateStyle: "full",
    timeStyle: "long",
  });
  return {
    content: [{ type: "text", text: timeStr }],
    details: { utcTimestamp: date.getTime() },
  };
}

const getCurrentTimeSchema = Type.Object({
  timezone: Type.Optional(
    Type.String({
      description:
        "Optional timezone (e.g., 'America/New_York', 'Europe/London')",
    }),
  ),
});

type GetCurrentTimeParams = Static<typeof getCurrentTimeSchema>;

export const getCurrentTimeTool: AgentTool<
  typeof getCurrentTimeSchema,
  { utcTimestamp: number }
> = {
  label: "Current Time",
  name: "get_current_time",
  description: "Get the current date and time",
  parameters: getCurrentTimeSchema,
  execute: async (_toolCallId: string, args: GetCurrentTimeParams) => {
    return getCurrentTime(args.timezone);
  },
};