import {
  CheckCircle2,
  AlertTriangle,
  AlertCircle,
  CircleDashed,
  type LucideIcon,
} from 'lucide-react'

/**
 * Shared status vocabulary for the SystemHealth blocks (768w.16.8.2).
 *
 * Every health signal collapses to one of four tones. The tone is always
 * encoded REDUNDANTLY — a colored dot AND an icon AND a text label — so the
 * signal never depends on color alone (accessibility), matching the rest of the
 * @startsimpli/ui dashboard kit's static semantic palette.
 */
export type HealthStatus = 'ok' | 'warn' | 'critical' | 'neutral'

export interface HealthTone {
  /** Default human label for the tone (composers may override). */
  label: string
  /** Solid dot / bar fill. */
  dot: string
  /** Foreground text for the tone. */
  text: string
  /** Soft background for pills / accents. */
  softBg: string
  /** Left-accent border color for HealthCard. */
  border: string
  /** The lucide icon that stands in for the tone. */
  Icon: LucideIcon
}

export const HEALTH_TONE: Record<HealthStatus, HealthTone> = {
  ok: {
    label: 'Healthy',
    dot: 'bg-emerald-500',
    text: 'text-emerald-700',
    softBg: 'bg-emerald-50',
    border: 'border-l-emerald-500',
    Icon: CheckCircle2,
  },
  warn: {
    label: 'Needs attention',
    dot: 'bg-amber-500',
    text: 'text-amber-700',
    softBg: 'bg-amber-50',
    border: 'border-l-amber-500',
    Icon: AlertTriangle,
  },
  critical: {
    label: 'Critical',
    dot: 'bg-red-500',
    text: 'text-red-700',
    softBg: 'bg-red-50',
    border: 'border-l-red-500',
    Icon: AlertCircle,
  },
  neutral: {
    label: 'No data',
    dot: 'bg-gray-400',
    text: 'text-gray-600',
    softBg: 'bg-gray-50',
    border: 'border-l-gray-300',
    Icon: CircleDashed,
  },
}

const SEVERITY: Record<HealthStatus, number> = { neutral: 0, ok: 1, warn: 2, critical: 3 }

/**
 * Roll several signals up to the single worst tone — the accent a HealthCard
 * shows. `critical` beats `warn` beats `ok`; `neutral` (no data) only wins when
 * there is nothing else to report.
 */
export function worstStatus(statuses: HealthStatus[]): HealthStatus {
  if (statuses.length === 0) return 'neutral'
  return statuses.reduce((worst, s) => (SEVERITY[s] > SEVERITY[worst] ? s : worst), 'neutral')
}