import type { KpiStatus } from '../components/KpiCard.tsx';

/**
 * Daily mortality % of DOC thresholds (manager operational rules):
 * - <= 0.05%: Normal / OK (green)
 * - > 0.05% and < 0.10%: Warning (yellow)
 * - >= 0.10%: Critical (red)
 */
export const DAILY_MORTALITY_DOC_THRESHOLDS = {
  warning_pct: 0.05,
  critical_pct: 0.1,
} as const;

/**
 * Calculates daily mortality percentage relative to initial DOC count.
 */
export function getDailyMortalityPct(
  mortalityToday: number | null | undefined,
  docInCount: number | null | undefined
): number | null {
  if (mortalityToday == null || docInCount == null || docInCount <= 0) {
    return null;
  }
  return (mortalityToday / docInCount) * 100;
}

/**
 * Evaluates the KPI status for daily mortality based on DOC thresholds.
 * - 'na' when data is unavailable
 * - 'critical' when daily mortality >= 0.10%
 * - 'warning' when daily mortality > 0.05%
 * - 'ok' when daily mortality <= 0.05%
 */
export function getDailyMortalityStatus(
  mortalityToday: number | null | undefined,
  docInCount: number | null | undefined
): KpiStatus {
  if (mortalityToday == null) return 'na';
  if (docInCount == null || docInCount <= 0) return 'ok';

  const dailyPct = (mortalityToday / docInCount) * 100;
  if (dailyPct >= DAILY_MORTALITY_DOC_THRESHOLDS.critical_pct) {
    return 'critical';
  }
  if (dailyPct > DAILY_MORTALITY_DOC_THRESHOLDS.warning_pct) {
    return 'warning';
  }
  return 'ok';
}