import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

// Calculate expected value
export function calculateExpectedValue(tcv: number | null | undefined, winProbability: number | null | undefined): number | null {
  if (!tcv || !winProbability) return null
  return tcv * (winProbability / 100)
}

// Calculate expected gross profit
export function calculateExpectedGrossProfit(
  tcv: number | null | undefined,
  marginPercent: number | null | undefined,
  winProbability: number | null | undefined
): number | null {
  if (!tcv || !marginPercent || !winProbability) return null
  return tcv * (marginPercent / 100) * (winProbability / 100)
}

// Calculate RFP Value Score (0-100)
export function calculateValueScore(rfp: {
  scoreNewLogo: number
  scoreRegionExpansion: number
  scoreCaseStudy: number
  scoreReusableAssets: number
  scoreCompetitivePosition: number
  scoreRelationship: number
  scorePartnerCoSell: number
  estimatedTCV?: number | null
  expectedMarginPercent?: number | null
  winProbabilityPercent?: number | null
}): number {
  // Financial: 40 points (normalized from TCV and expected value)
  let financialScore = 0
  if (rfp.estimatedTCV) {
    // Normalize TCV to 0-20 (assuming $10M is max for 20 points)
    financialScore += Math.min(20, (rfp.estimatedTCV / 10000000) * 20)
  }
  if (rfp.expectedMarginPercent && rfp.winProbabilityPercent) {
    // Add margin × win% as additional 20 points
    financialScore += ((rfp.expectedMarginPercent / 100) * (rfp.winProbabilityPercent / 100)) * 20
  }

  // Strategic: 35 points (7 items × 5 points each = 35 max)
  const strategicScore = (
    rfp.scoreNewLogo +
    rfp.scoreRegionExpansion +
    rfp.scoreCaseStudy +
    rfp.scoreReusableAssets +
    rfp.scoreCompetitivePosition
  ) * (35 / 25) // Normalize 25 points (5 items × 5) to 35

  // Partnership: 25 points (2 items × 5 = 10, normalize to 25)
  const partnershipScore = (
    rfp.scoreRelationship +
    rfp.scorePartnerCoSell
  ) * (25 / 10)

  return Math.min(100, Math.round(financialScore + strategicScore + partnershipScore))
}

// Get value tier based on score
export function getValueTier(score: number): string {
  if (score >= 80) return 'Must Pursue'
  if (score >= 60) return 'Pursue if capacity'
  return 'Watchlist / No-Go'
}

// Calculate ROI Index
export function calculateROIIndex(valueScore: number | null | undefined, bidEffortHours: number | null | undefined): number | null {
  if (!valueScore || !bidEffortHours || bidEffortHours === 0) return null
  return valueScore / bidEffortHours
}

// Format currency
export function formatCurrency(amount: number | null | undefined): string {
  if (!amount) return '$0'
  return new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency: 'USD',
    minimumFractionDigits: 0,
    maximumFractionDigits: 0,
  }).format(amount)
}

// Format date
export function formatDate(date: Date | string | null | undefined): string {
  if (!date) return 'N/A'
  return new Date(date).toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
  })
}

// Calculate days until deadline
export function daysUntilDeadline(deadline: Date | string | null | undefined): number | null {
  if (!deadline) return null
  const now = new Date()
  const deadlineDate = new Date(deadline)
  const diffTime = deadlineDate.getTime() - now.getTime()
  const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24))
  return diffDays
}

// Get certification status badge color
export function getCertStatusColor(status: string): string {
  switch (status) {
    case 'Valid':
    case 'Available & valid':
      return 'bg-green-100 text-green-800'
    case 'Expiring Soon':
    case 'Available but expiring soon':
      return 'bg-yellow-100 text-yellow-800'
    case 'Expired':
    case 'Missing':
      return 'bg-red-100 text-red-800'
    default:
      return 'bg-gray-100 text-gray-800'
  }
}

// Get status badge color
export function getStatusColor(status: string): string {
  switch (status) {
    case 'Done':
    case 'Submitted':
      return 'bg-green-100 text-green-800'
    case 'In Progress':
    case 'Writing':
    case 'Review':
      return 'bg-blue-100 text-blue-800'
    case 'Blocked':
      return 'bg-red-100 text-red-800'
    case 'Not Started':
    case 'Intake':
      return 'bg-gray-100 text-gray-800'
    case 'Final QA':
      return 'bg-purple-100 text-purple-800'
    default:
      return 'bg-gray-100 text-gray-800'
  }
}

// Get Go/No-Go status color
export function getGoNoGoColor(status: string): string {
  switch (status) {
    case 'Go':
      return 'bg-green-100 text-green-800'
    case 'No-Go':
      return 'bg-red-100 text-red-800'
    case 'Watchlist':
      return 'bg-yellow-100 text-yellow-800'
    case 'Pending':
      return 'bg-gray-100 text-gray-800'
    default:
      return 'bg-gray-100 text-gray-800'
  }
}

// Get risk level color
export function getRiskColor(risk: string): string {
  switch (risk) {
    case 'High':
      return 'bg-red-100 text-red-800'
    case 'Med':
    case 'Medium':
      return 'bg-yellow-100 text-yellow-800'
    case 'Low':
      return 'bg-green-100 text-green-800'
    default:
      return 'bg-gray-100 text-gray-800'
  }
}