/**
 * Shared CWMP event normalization and priority resolution utilities.
 * Single source of truth for event code handling (fixes MINEUR-9).
 */

export const EVENT_PRIORITY: Record<string, number> = {
  'BOOTSTRAP': 100,
  'BOOT': 90,
  'CONNECTION REQUEST': 80,
  'PERIODIC': 70,
  'VALUE CHANGE': 60,
  'DIAGNOSTICS COMPLETE': 50,
  'TRANSFER COMPLETE': 40,
  'SCHEDULE': 30,
}

/**
 * Normalize an EventCode from an Inform message.
 * Strips numeric prefix and normalizes the label.
 * Examples: '0 BOOTSTRAP' → 'BOOTSTRAP', '1 BOOT' → 'BOOT', '6' → 'CONNECTION REQUEST'
 */
export function normalizeEventCode(raw: string): string {
  const trimmed = raw.trim().toUpperCase()

  // Already a known label without numeric prefix
  if (EVENT_PRIORITY[trimmed] !== undefined) return trimmed

  // Full format like "0 BOOTSTRAP" → strip numeric prefix
  const match = trimmed.match(/^\d+\s+(.+)$/)
  if (match) return match[1]

  // Numeric-only → expand to standard label
  switch (trimmed) {
    case '0': return 'BOOTSTRAP'
    case '1': return 'BOOT'
    case '2': return 'PERIODIC'
    case '3': return 'SCHEDULED'
    case '4': return 'VALUE CHANGE'
    case '5': return 'KICKED'
    case '6': return 'CONNECTION REQUEST'
    case '7': return 'TRANSFER COMPLETE'
    case '8': return 'DIAGNOSTICS COMPLETE'
    default: return trimmed
  }
}

/**
 * Resolve the highest priority event from a list of raw event codes.
 * Returns the normalized name of the highest-priority event.
 */
export function resolveHighestPriorityEvent(events: string[]): string {
  if (events.length === 0) return ''

  let highest = ''
  let highestPriority = -1

  for (const raw of events) {
    const normalized = normalizeEventCode(raw)
    const priority = EVENT_PRIORITY[normalized] ?? 0
    if (priority > highestPriority) {
      highestPriority = priority
      highest = normalized
    }
  }

  return highest
}