/** Status implied by a fact's leading "Yes"/"No" token, if any. */
export type FactStatus = 'yes' | 'no' | 'neutral'

export interface ParsedFact {
  status: FactStatus
  /** The value with any leading "Yes:"/"No:" token stripped, ready to render next to a status icon. */
  text: string
}

// The negative lookahead (?![a-zA-Z]) requires the "Yes"/"No" token to end at a word
// boundary, so values like "Not documented" or "Not publicly documented" (which start
// with the letters "No" but aren't the boolean token) fall through to 'neutral' instead
// of being misread as a "No" status. The separator group accepts either a colon
// ("Yes: ...") or a comma ("Yes, but ...") since both are used throughout the dataset.
const STATUS_PREFIX = /^(Yes|No)(?![a-zA-Z])(?:[:,]\s*)?(.*)$/s

/**
 * Splits a {@link Fact.value} string into a status (for a compact icon) and
 * the remaining descriptive text. Every fact in `apps/sim/lib/compare/data`
 * that represents a yes/no capability is written as `"Yes: ..."` / `"No: ..."`,
 * or occasionally `"Yes, ..."` / `"No, ..."` as a more natural continuation.
 * This is the single place that convention is parsed, so the comparison table
 * and the key-differences strip render it identically.
 */
export function parseFactValue(value: string): ParsedFact {
  const match = value.match(STATUS_PREFIX)
  if (!match) {
    return { status: 'neutral', text: value }
  }
  const [, token, rest] = match
  const trimmedRest = rest.trim()
  return {
    status: token === 'Yes' ? 'yes' : 'no',
    text: trimmedRest.length > 0 ? trimmedRest : token,
  }
}