import type { Difficulty, MachineCategory, ReleasePhase } from '@/types/catalogue';

export function formatNumber(value: number): string {
  return new Intl.NumberFormat('en', {
    maximumFractionDigits: 0
  }).format(value);
}

export function pluralize(count: number, singular: string, plural = `${singular}s`): string {
  return `${formatNumber(count)} ${count === 1 ? singular : plural}`;
}

export function partCountLabel(count: number): string {
  return pluralize(count, 'part');
}

export function difficultyToTone(
  difficulty: Difficulty,
): 'success' | 'warm' | 'accent' | 'neutral' {
  switch (difficulty) {
    case 'Beginner':
      return 'success';
    case 'Intermediate':
      return 'warm';
    case 'Advanced':
      return 'accent';
    default:
      return 'neutral';
  }
}

export function difficultyDescription(difficulty: Difficulty): string {
  switch (difficulty) {
    case 'Beginner':
      return 'Conceptual model with accessible motion and minimal prerequisites.';
    case 'Intermediate':
      return 'Requires comfort with basic kinematics, pressure, or gear terminology.';
    case 'Advanced':
      return 'Multi-domain system with coupled timing, flow, thermal, or control effects.';
    default:
      return 'Engineering reference difficulty.';
  }
}

export function phaseLabel(phase: ReleasePhase): string {
  return phase === 'core' ? 'Core' : 'Stretch';
}

export function phaseDescription(phase: ReleasePhase): string {
  return phase === 'core'
    ? 'Part of the Phase 1 machine catalogue.'
    : 'Architecture-supported stretch machine for later 3D expansion.';
}

export function categoryToSlug(category: MachineCategory): string {
  return category
    .toLowerCase()
    .replace(/&/g, 'and')
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/(^-|-$)/g, '');
}

export function categoryShortLabel(category: MachineCategory): string {
  switch (category) {
    case 'Gearboxes & Drives':
      return 'Drives';
    case 'Pumps & Fluid Systems':
      return 'Fluids';
    case 'Structural / Other':
      return 'Structural';
    default:
      return category;
  }
}