export function fmtPct(v: number | null, decimals = 0): string {
  if (v === null) return '—'
  return `${(v * 100).toFixed(decimals)}%`
}

export function fmtNum(v: number | null, decimals = 4): string {
  if (v === null) return '—'
  return v.toFixed(decimals)
}

/* Score scale: green → light green → amber → red */
export function lucColor(v: number | null): string {
  if (v === null) return 'var(--text-3)'
  if (v >= 0.9) return '#22C55E'
  if (v >= 0.75) return '#4ADE80'
  if (v >= 0.6) return '#F0A030'
  return '#F4333D'
}

export function ragColor(v: number | null): string {
  if (v === null) return 'var(--text-3)'
  if (v >= 0.65) return '#22C55E'
  if (v >= 0.5) return '#4ADE80'
  if (v >= 0.35) return '#F0A030'
  return '#F4333D'
}

export function fairnessColor(avg: number | null): string {
  if (avg === null) return 'var(--text-3)'
  if (avg <= 0.1) return '#22C55E'
  if (avg <= 0.2) return '#4ADE80'
  if (avg <= 0.4) return '#F0A030'
  return '#F4333D'
}

export const CREATOR_COLORS: Record<string, string> = {
  Anthropic: '#e07040',
  Google: '#4285f5',
  OpenAI: '#5ac8a8',
  xAI: '#000000',
  Meta: '#1877f2',
  DeepSeek: '#8b7fff',
  Moonshot: '#ff9bb0',
  Alibaba: '#ff8800',
  zAI: '#3B5CEB',
  'MiniMax AI': '#E8441A',
}

export function creatorColor(creator: string): string {
  return CREATOR_COLORS[creator] ?? '#6b7280'
}

export const GUARDRAIL_CREATOR_COLORS: Record<string, string> = {
  GovTech: '#CC2984',
  Microsoft: '#00A4EF',
  Amazon: '#FF9900',
  Meta: '#1877f2',
  OpenAI: '#5ac8a8',
}

export function guardrailCreatorColor(creator: string): string {
  return GUARDRAIL_CREATOR_COLORS[creator] ?? CREATOR_COLORS[creator] ?? '#6b7280'
}

export function inferModelSize(model: string): 'Small' | 'Medium' | 'Large' {
  const n = model.toLowerCase()

  // Small: lightweight / edge tier (≤10B open-weight, or Haiku/Nano/Lite families)
  if (/haiku|nano|\blite\b|\bsmall\b/.test(n)) return 'Small'

  // Explicit parameter count in the name (e.g. "70B", "235B", "20B")
  const paramMatch = n.match(/(\d+)b\b/)
  if (paramMatch) {
    const params = parseInt(paramMatch[1], 10)
    if (params <= 10) return 'Small'
    if (params <= 40) return 'Medium'
    return 'Large'
  }

  // Medium: mid-tier commercial families or mid-size open-weight
  if (/\bmini\b|sonnet|\bflash\b|\bplus\b|\bchat\b|\bfast\b|gemma/.test(n)) return 'Medium'

  // Large: flagship / pro / opus, or any unmatched model (defaults to Large)
  return 'Large'
}

export function normalizedFairness(avg: number | null, maxAvg: number): number | null {
  if (avg === null || maxAvg === 0) return null
  return Math.max(0, 1 - avg / maxAvg)
}