import { type AimuxUserConfig, resolveConfig, type ResolvedConfig } from '@brimveyn/aimux-config'
import { join } from 'node:path'

import { logDebug } from '../debug/input-log'
import { getProfileConfigDir } from '../profile-paths'

const CONFIG_FILENAMES = ['aimux.config.ts', 'aimux.config.js']

/**
 * Load the user's aimux.config.ts (or .js), merge with defaults, and return
 * a resolved config. Falls back to pure defaults if no config file exists.
 */
export async function loadUserConfig(): Promise<ResolvedConfig> {
  const configDir = getProfileConfigDir()

  for (const filename of CONFIG_FILENAMES) {
    const configPath = join(configDir, filename)

    try {
      const file = Bun.file(configPath)
      if (!(await file.exists())) continue

      const mod = await import(configPath)
      const userConfig: AimuxUserConfig = mod.default ?? mod

      logDebug('config.user.loaded', { path: configPath })
      return resolveConfig(userConfig)
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error)
      logDebug('config.user.error', { error: message, path: configPath })
      // Fall through to try next filename or use defaults
    }
  }

  return resolveConfig({})
}