import type { IntentId } from '@/lib/interactive-demo/types'

/**
 * Desaturated palette — one set for light, one for dark (P11).
 * No free hex in demo JSON; app maps intents here.
 */
export const INTENT_PALETTE_LIGHT: Record<IntentId | 'neutral', string> = {
  neutral: '#5c5c5c',
  highlight: '#5a7a9a', // prune / slate-blue
  flow: '#4a7d68',
  cache: '#7a6a8a',
  compute: '#8a6b4a',
  output: '#4a7a8a',
  warning: '#9a6548',
}

export const INTENT_PALETTE_DARK: Record<IntentId | 'neutral', string> = {
  neutral: '#a8a8a8',
  highlight: '#8aabca',
  flow: '#7ab89a',
  cache: '#a898b8',
  compute: '#c0a080',
  output: '#7ab0c0',
  warning: '#d09070',
}

/** Light: ~35% readable on white; dark: ~20% as spec. */
export const DIM_OPACITY_LIGHT = 0.35
export const DIM_OPACITY_DARK = 0.2

export function intentColor(
  intent: IntentId | null | undefined,
  dark: boolean
): string {
  const palette = dark ? INTENT_PALETTE_DARK : INTENT_PALETTE_LIGHT
  if (!intent) return palette.neutral
  return palette[intent] ?? palette.neutral
}

export function spotlightColor(dark: boolean): string {
  return intentColor('highlight', dark)
}

export function dimOpacity(dark: boolean): number {
  return dark ? DIM_OPACITY_DARK : DIM_OPACITY_LIGHT
}

export const CIRCLED_NUMBERS = ['①', '②', '③', '④', '⑤', '⑥', '⑦', '⑧', '⑨', '⑩'] as const

export function badgeGlyph(index: number): string {
  if (index >= 1 && index <= CIRCLED_NUMBERS.length) {
    return CIRCLED_NUMBERS[index - 1]!
  }
  return String(index)
}

/** Writing rule for generation prompts (not enforced in renderer). */
export const SPEAK_WRITING_GUIDE = {
  maxWordsApprox: 25,
  sentences: '1–2',
  note: 'Demo tempo is decided at writing time, not at render.',
} as const