import {readFileSync, writeFileSync, existsSync} from 'node:fs'
import path from 'node:path'
import {paths} from './paths'

const CONFIG_FILE = path.join(paths.root, 'config.json')

function readConfig(): Record<string, string> {
  if (!existsSync(CONFIG_FILE)) return {}
  try {
    return JSON.parse(readFileSync(CONFIG_FILE, 'utf-8'))
  } catch {
    return {}
  }
}

export function writeConfig(values: Record<string, string>): void {
  const existing = readConfig()
  const merged = {...existing, ...values}
  writeFileSync(CONFIG_FILE, JSON.stringify(merged, null, 2) + '\n')
}

export function notionToken(): string | null {
  return process.env.NOTION_API_TOKEN ?? readConfig().NOTION_API_TOKEN ?? null
}

export function notionWorkspacePageId(): string | null {
  return (
    process.env.NOTION_WORKSPACE_PAGE_ID ??
    readConfig().NOTION_WORKSPACE_PAGE_ID ??
    null
  )
}