export type Container = {
  id: string
  image: string
  command: string
  created: string
  status: string
  ports: string
  name: string
}

// Parse the fixed-width table output of `docker ps --format table`
export function parseDockerPs(output: string): Container[] {
  const lines = output.trim().split('\n').filter(Boolean)
  if (lines.length < 2) return []

  const header = lines[0]

  const COLS = ['CONTAINER ID', 'IMAGE', 'COMMAND', 'CREATED', 'STATUS', 'PORTS', 'NAMES'] as const
  const positions = COLS.map((col) => header.indexOf(col))

  // Must find at least NAMES (last) to produce useful output
  if (positions[6] === -1) return []

  const extract = (line: string, i: number): string => {
    const start = positions[i]
    if (start === -1) return ''
    const nextIdx = positions.slice(i + 1).find((p) => p !== -1)
    return line.slice(start, nextIdx).trim()
  }

  return lines.slice(1).map((line) => ({
    id: extract(line, 0),
    image: extract(line, 1),
    command: extract(line, 2),
    created: extract(line, 3),
    status: extract(line, 4),
    ports: extract(line, 5),
    name: extract(line, 6),
  }))
}