import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";

export interface BrowserConfig {
  headless: boolean;
  width: number;
  height: number;
  navigationTimeoutMs: number;
  previewChars: number;
}

export const DEFAULT_CONFIG: BrowserConfig = {
  headless: true,
  width: 1280,
  height: 800,
  navigationTimeoutMs: 30000,
  previewChars: 4000,
};

const CONFIG_PATH = path.join(os.homedir(), ".pi", "agent", "configs", "opl-browser.json");

export function loadUserConfig(configPath = CONFIG_PATH): BrowserConfig {
  let user: Partial<BrowserConfig> = {};
  try {
    user = JSON.parse(fs.readFileSync(configPath, "utf8"));
  } catch {
    user = {};
  }
  return {
    headless: user.headless ?? DEFAULT_CONFIG.headless,
    width: user.width ?? DEFAULT_CONFIG.width,
    height: user.height ?? DEFAULT_CONFIG.height,
    navigationTimeoutMs: user.navigationTimeoutMs ?? DEFAULT_CONFIG.navigationTimeoutMs,
    previewChars: user.previewChars ?? DEFAULT_CONFIG.previewChars,
  };
}