import { homedir } from 'node:os'
import { resolve as resolvePath } from 'node:path'

export interface SynthesisConfig {
  bridgePort: number
  channelWsPort: number
  permissionMode: string
  idleKillMs: number
  maxProcesses: number
  mappingDbPath: string
  channelName: string
}

const DEFAULTS: SynthesisConfig = {
  bridgePort: 18900,
  channelWsPort: 18901,
  permissionMode: 'bypassPermissions',
  idleKillMs: 3_600_000,
  maxProcesses: 16,
  mappingDbPath: '~/.openclaw/synthesis/sessions.json',
  channelName: 'synthesis',
}

function expand(p: string): string {
  if (p.startsWith('~')) return resolvePath(homedir(), p.slice(2))
  return resolvePath(p)
}

export function normalizeConfig(raw: unknown): SynthesisConfig {
  const r = (raw ?? {}) as Partial<SynthesisConfig>
  const merged: SynthesisConfig = {
    bridgePort: typeof r.bridgePort === 'number' ? r.bridgePort : DEFAULTS.bridgePort,
    channelWsPort: typeof r.channelWsPort === 'number' ? r.channelWsPort : DEFAULTS.channelWsPort,
    permissionMode: typeof r.permissionMode === 'string' && r.permissionMode ? r.permissionMode : DEFAULTS.permissionMode,
    idleKillMs: typeof r.idleKillMs === 'number' ? r.idleKillMs : DEFAULTS.idleKillMs,
    maxProcesses: typeof r.maxProcesses === 'number' ? r.maxProcesses : DEFAULTS.maxProcesses,
    mappingDbPath: typeof r.mappingDbPath === 'string' && r.mappingDbPath ? r.mappingDbPath : DEFAULTS.mappingDbPath,
    channelName: typeof r.channelName === 'string' && r.channelName ? r.channelName : DEFAULTS.channelName,
  }
  merged.mappingDbPath = expand(merged.mappingDbPath)
  return merged
}