import fs from "node:fs";
import { ConfigError, loadConfig } from "../../lib/config/load";
import { isPortFree } from "../lib/network";
import { resolveConfigPath } from "../lib/paths";

export interface DoctorOptions {
  config?: string;
}

export async function doctorCommand(opts: DoctorOptions): Promise<void> {
  const rows: [string, string][] = [];

  rows.push(["Node.js", process.version]);

  const configPath = resolveConfigPath(opts.config);
  const exists = fs.existsSync(configPath);
  rows.push([
    "Config path",
    `${configPath} ${exists ? "(exists)" : "(not found)"}`,
  ]);

  if (exists) {
    try {
      const { config } = loadConfig(configPath);
      const portFree = await isPortFree(config.server.host, config.server.port);
      rows.push([
        "Port available",
        portFree
          ? "yes"
          : `no (${config.server.host}:${config.server.port} in use)`,
      ]);
      rows.push(["Scripts configured", String(config.scripts.length)]);
      rows.push(["Auth enabled", String(config.auth.enabled)]);
    } catch (error) {
      if (error instanceof ConfigError) {
        rows.push(["Config", error.message]);
      } else {
        throw error;
      }
    }
  }

  const labelWidth = Math.max(...rows.map(([label]) => label.length));
  for (const [label, value] of rows) {
    console.log(`${label.padEnd(labelWidth)}  ${value}`);
  }
}