/**
 * C-001: MCP Server Framework — stdio transport for Gateway compatibility.
 */

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { z } from "zod";
import * as tools from "./tools.js";

export function createServer(): McpServer {
  const server = new McpServer({ name: "yuzu-gca-device", version: "0.1.0" });

  server.tool("file_list",   "List directory contents", { path: z.string(), recursive: z.boolean().optional() }, async a => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.file_list(a)) }] }));
  server.tool("file_read",   "Read file content",       { path: z.string(), encoding: z.string().optional(), offset: z.number().optional(), limit: z.number().optional() }, async a => ({ content: [{ type: "text" as const, text: (await tools.file_read(a)).content }] }));
  server.tool("file_write",  "Write file content",      { path: z.string(), content: z.string(), encoding: z.string().optional() }, async a => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.file_write(a)) }] }));
  server.tool("file_move",   "Move/rename file",        { from: z.string(), to: z.string() }, async a => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.file_move(a)) }] }));
  server.tool("exec",        "Execute shell command",   { command: z.string(), cwd: z.string().optional(), timeout: z.number().optional() }, async a => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.exec(a)) }] }));
  server.tool("process_list","List running processes",  { filter: z.string().optional() }, async a => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.process_list(a)) }] }));
  server.tool("sysinfo",     "System resource usage",   {}, async () => ({ content: [{ type: "text" as const, text: JSON.stringify(await tools.sysinfo({})) }] }));

  return server;
}

export async function startServer(server: McpServer): Promise<void> {
  const transport = new StdioServerTransport();
  await server.connect(transport);
  console.error("[Yuzu-GCA] MCP Server ready (stdio)");
}

export async function bootstrap(): Promise<McpServer> {
  const server = createServer();
  await startServer(server);
  return server;
}