import type { HealthStatus } from '../types'

export interface HealthStatusResult {
  status: HealthStatus
  reason?: string
}

export function calculateExpectedProgress(
  startDate: Date,
  endDate: Date,
  currentDate: Date = new Date()
): number {
  if (currentDate <= startDate) return 0
  if (currentDate >= endDate) return 100
  const totalDuration = endDate.getTime() - startDate.getTime()
  const elapsed = currentDate.getTime() - startDate.getTime()
  return Math.round((elapsed / totalDuration) * 100)
}

export function calculateHealthStatus(
  progress: number,
  expectedProgress: number,
  hasBlockers: boolean = false
): HealthStatusResult {
  if (hasBlockers) return { status: 'blocked', reason: 'Has active blockers' }
  if (progress === 0 && expectedProgress > 0) return { status: 'not_started', reason: 'Work has not started' }
  if (progress - expectedProgress < -10) return { status: 'at_risk', reason: 'Behind schedule' }
  return { status: 'on_track' }
}

export function getHealthColor(status: HealthStatus): string {
  const colors: Record<HealthStatus, string> = {
    on_track: '#22c55e',
    at_risk: '#eab308',
    blocked: '#ef4444',
    not_started: '#9ca3af',
  }
  return colors[status]
}