import type { PaseoApi } from "@getpaseo/client";
import type { z } from "zod";
import type { PluginHookAgent } from "./lifecycle.js";

export interface AgentToolContext {
  agent: PluginHookAgent;
  paseo: PaseoApi;
  signal: AbortSignal;
}

export interface AgentToolResult {
  text?: string;
  structuredContent?: unknown;
  isError?: boolean;
}

export interface AgentToolDefinition {
  name: string;
  title?: string;
  description: string;
  input: z.ZodType;
  execute(input: unknown, context: AgentToolContext): AgentToolResult | Promise<AgentToolResult>;
}

export function defineAgentTool<Input extends z.ZodType>(tool: {
  name: string;
  title?: string;
  description: string;
  input: Input;
  execute(
    input: z.output<Input>,
    context: AgentToolContext,
  ): AgentToolResult | Promise<AgentToolResult>;
}): AgentToolDefinition {
  if (!/^[a-z][a-z0-9_]*$/.test(tool.name) || tool.name.length > 64) {
    throw new Error(`Invalid agent tool name: ${tool.name}`);
  }
  return tool;
}