enfusion-mcp

import { readFileSync, existsSync } from "node:fs";
import { resolve, dirname } from "node:path";
import { fileURLToPath } from "node:url";
import { homedir } from "node:os";
import { logger } from "./utils/logger.js";

export interface Config {
  /** Path to "Arma Reforger Tools" installation */
  workbenchPath: string;
  /** Default project directory for project_browse */
  projectPath: string;
  /** Directory containing scraped data index */
  dataDir: string;
  /** Directory containing mod pattern definitions */
  patternsDir: string;
}

const DEFAULTS: Config = {
  workbenchPath:
    "C:\\Program Files (x86)\\Steam\\steamapps\\common\\Arma Reforger Tools",
  projectPath: "",
  dataDir: resolve(
    dirname(fileURLToPath(import.meta.url)),
    "..",
    "data"
  ),
  patternsDir: resolve(
    dirname(fileURLToPath(import.meta.url)),
    "..",
    "data",
    "patterns"
  ),
};

function loadJsonFile(path: string): Partial<Config> {
  try {
    if (existsSync(path)) {
      const raw = readFileSync(path, "utf-8");
      return JSON.parse(raw) as Partial<Config>;
    }
  } catch (e) {
    logger.warn(`Failed to load config from ${path}: ${e}`);
  }
  return {};
}

export function loadConfig(): Config {
  // 1. Start with defaults
  const config = { ...DEFAULTS };

  // 2. Package-local config file
  const localConfigPath = resolve(
    dirname(fileURLToPath(import.meta.url)),
    "..",
    "enfusion-mcp.config.json"
  );
  Object.assign(config, loadJsonFile(localConfigPath));

  // 3. User home config
  const homeConfigPath = resolve(homedir(), ".enfusion-mcp", "config.json");
  Object.assign(config, loadJsonFile(homeConfigPath));

  // 4. Environment variables override everything
  if (process.env.ENFUSION_WORKBENCH_PATH) {
    config.workbenchPath = process.env.ENFUSION_WORKBENCH_PATH;
  }
  if (process.env.ENFUSION_PROJECT_PATH) {
    config.projectPath = process.env.ENFUSION_PROJECT_PATH;
  }
  if (process.env.ENFUSION_MCP_DATA_DIR) {
    config.dataDir = process.env.ENFUSION_MCP_DATA_DIR;
  }

  logger.debug("Config loaded", config);
  return config;
}