import {
  DQ_HIGH, DQ_MEDIUM,
  CONF_HIGH, CONF_MEDIUM,
  SCORE_STRONG, SCORE_MODERATE,
  PROB_HIGH, PROB_MEDIUM,
} from './constants'

// ── Formatting ────────────────────────────────────────────────────────────────

export function formatCHF(amount: number, decimals = 0): string {
  return new Intl.NumberFormat('de-CH', {
    style: 'currency',
    currency: 'CHF',
    minimumFractionDigits: decimals,
    maximumFractionDigits: decimals,
  }).format(amount)
}

export function formatArea(sqm: number): string {
  return `${new Intl.NumberFormat('de-CH').format(sqm)} m²`
}

export function formatPercent(value: number, decimals = 0): string {
  return `${(value * 100).toFixed(decimals)} %`
}

export function formatDate(iso: string): string {
  return new Intl.DateTimeFormat('de-CH', { day: '2-digit', month: '2-digit', year: 'numeric' }).format(new Date(iso))
}

export function formatRelativeDate(iso: string): string {
  const diff = Date.now() - new Date(iso).getTime()
  const hours = Math.floor(diff / 3_600_000)
  if (hours < 1) return 'Gerade eben'
  if (hours < 24) return `vor ${hours} Stunde${hours === 1 ? '' : 'n'}`
  const days = Math.floor(hours / 24)
  if (days < 7) return `vor ${days} Tag${days === 1 ? '' : 'en'}`
  return formatDate(iso)
}

// ── Color helpers (return MUI color token strings) ────────────────────────────

export function dataQualityColor(score: number): 'success' | 'warning' | 'error' {
  if (score >= DQ_HIGH) return 'success'
  if (score >= DQ_MEDIUM) return 'warning'
  return 'error'
}

export function confidenceColor(score: number): 'success' | 'primary' | 'warning' {
  if (score >= CONF_HIGH) return 'success'
  if (score >= CONF_MEDIUM) return 'primary'
  return 'warning'
}

export function matchScoreColor(score: number): 'success' | 'warning' | 'error' {
  if (score >= SCORE_STRONG) return 'success'
  if (score >= SCORE_MODERATE) return 'warning'
  return 'error'
}

export function probabilityColor(prob: number): 'success' | 'warning' | 'error' {
  if (prob >= PROB_HIGH) return 'success'
  if (prob >= PROB_MEDIUM) return 'warning'
  return 'error'
}

// Hex color variants for use in sx (when MUI color tokens aren't enough)
export function dataQualityHex(score: number): string {
  if (score >= DQ_HIGH) return '#1a7a4a'
  if (score >= DQ_MEDIUM) return '#d97706'
  return '#c0392b'
}

export function confidenceHex(score: number): string {
  if (score >= CONF_HIGH) return '#1a7a4a'
  if (score >= CONF_MEDIUM) return '#1e3a5f'
  return '#d97706'
}

export function probabilityHex(prob: number): string {
  if (prob >= PROB_HIGH) return '#1a7a4a'
  if (prob >= PROB_MEDIUM) return '#d97706'
  return '#c0392b'
}

// ── Misc ──────────────────────────────────────────────────────────────────────

export function clamp(value: number, min: number, max: number): number {
  return Math.min(Math.max(value, min), max)
}

export function average(values: number[]): number {
  if (values.length === 0) return 0
  return values.reduce((a, b) => a + b, 0) / values.length
}

export function truncate(str: string, maxLen: number): string {
  return str.length <= maxLen ? str : str.slice(0, maxLen - 1) + '…'
}