export type ActiveState = 'active' | 'inactive' | 'failed' | 'activating' | 'deactivating' | 'unknown'

export interface UnitStatus {
  activeState: ActiveState
  subState: string
  uptime: string
  description: string
}

const KNOWN_STATES = new Set(['active', 'inactive', 'failed', 'activating', 'deactivating'])

export function parseSystemctlStatus(output: string, unitName: string): UnitStatus {
  let activeState: ActiveState = 'unknown'
  let subState = ''
  let uptime = ''
  let description = unitName

  for (const line of output.split('\n')) {
    // Header line: "● scrum4me-web.service - Description text"
    const headerMatch = line.match(/^\s*[●○×◉]\s+\S+\s+-\s+(.+)/)
    if (headerMatch) description = headerMatch[1].trim()

    // Active line: "     Active: active (running) since Tue 2025-01-13...; 2h 30min ago"
    const activeMatch = line.match(/\bActive:\s+(\w+)(?:\s+\(([^)]+)\))?(?:.*?;\s+(.+?ago))?/)
    if (activeMatch) {
      const state = activeMatch[1].toLowerCase()
      activeState = KNOWN_STATES.has(state) ? (state as ActiveState) : 'unknown'
      subState = activeMatch[2] ?? ''
      uptime = activeMatch[3] ?? ''
    }
  }

  return { activeState, subState, uptime, description }
}