hermes/ui-tui/src/theme.ts

export interface ThemeColors {
  gold: string
  amber: string
  bronze: string
  cornsilk: string
  dim: string
  completionBg: string
  completionCurrentBg: string

  label: string
  ok: string
  error: string
  warn: string

  statusBg: string
  statusFg: string
  statusGood: string
  statusWarn: string
  statusBad: string
  statusCritical: string
  selectionBg: string

  diffAdded: string
  diffRemoved: string
  diffAddedWord: string
  diffRemovedWord: string

  shellDollar: string
}

export interface ThemeBrand {
  name: string
  icon: string
  prompt: string
  welcome: string
  goodbye: string
  tool: string
}

export interface Theme {
  color: ThemeColors
  brand: ThemeBrand
  bannerLogo: string
  bannerHero: string
}

// ── Color math ───────────────────────────────────────────────────────

function parseHex(h: string): [number, number, number] | null {
  const m = /^#?([0-9a-f]{6})$/i.exec(h)

  if (!m) {
    return null
  }

  const n = parseInt(m[1]!, 16)

  return [(n >> 16) & 0xff, (n >> 8) & 0xff, n & 0xff]
}

function mix(a: string, b: string, t: number) {
  const pa = parseHex(a)
  const pb = parseHex(b)

  if (!pa || !pb) {
    return a
  }

  const lerp = (i: 0 | 1 | 2) => Math.round(pa[i] + (pb[i] - pa[i]) * t)

  return '#' + ((1 << 24) | (lerp(0) << 16) | (lerp(1) << 8) | lerp(2)).toString(16).slice(1)
}

// ── Defaults ─────────────────────────────────────────────────────────

export const DEFAULT_THEME: Theme = {
  color: {
    gold: '#FFD700',
    amber: '#FFBF00',
    bronze: '#CD7F32',
    cornsilk: '#FFF8DC',
    dim: '#B8860B',
    completionBg: '#FFFFFF',
    completionCurrentBg: mix('#FFFFFF', '#FFBF00', 0.25),

    label: '#DAA520',
    ok: '#4caf50',
    error: '#ef5350',
    warn: '#ffa726',

    statusBg: '#1a1a2e',
    statusFg: '#C0C0C0',
    statusGood: '#8FBC8F',
    statusWarn: '#FFD700',
    statusBad: '#FF8C00',
    statusCritical: '#FF6B6B',
    // muted navy — sits under gold/amber fg without fighting it, swaps
    // cleanly with SGR-inverse that fragmented per fg color
    selectionBg: '#3a3a55',

    diffAdded: 'rgb(220,255,220)',
    diffRemoved: 'rgb(255,220,220)',
    diffAddedWord: 'rgb(36,138,61)',
    diffRemovedWord: 'rgb(207,34,46)',
    shellDollar: '#4dabf7'
  },

  brand: {
    name: 'Hermes Agent',
    icon: '⚕',
    prompt: '❯',
    welcome: 'Type your message or /help for commands.',
    goodbye: 'Goodbye! ⚕',
    tool: '┊'
  },

  bannerLogo: '',
  bannerHero: ''
}

// ── Skin → Theme ─────────────────────────────────────────────────────

export function fromSkin(
  colors: Record<string, string>,
  branding: Record<string, string>,
  bannerLogo = '',
  bannerHero = ''
): Theme {
  const d = DEFAULT_THEME
  const c = (k: string) => colors[k]

  const accent = c('banner_accent') ?? c('banner_title') ?? d.color.amber

  return {
    color: {
      gold: c('banner_title') ?? d.color.gold,
      amber: c('banner_accent') ?? d.color.amber,
      bronze: c('banner_border') ?? d.color.bronze,
      cornsilk: c('banner_text') ?? d.color.cornsilk,
      dim: c('banner_dim') ?? d.color.dim,
      completionBg: c('completion_menu_bg') ?? '#FFFFFF',
      completionCurrentBg: c('completion_menu_current_bg') ?? mix('#FFFFFF', accent, 0.25),

      label: c('ui_label') ?? d.color.label,
      ok: c('ui_ok') ?? d.color.ok,
      error: c('ui_error') ?? d.color.error,
      warn: c('ui_warn') ?? d.color.warn,

      statusBg: d.color.statusBg,
      statusFg: d.color.statusFg,
      statusGood: c('ui_ok') ?? d.color.statusGood,
      statusWarn: c('ui_warn') ?? d.color.statusWarn,
      statusBad: d.color.statusBad,
      statusCritical: d.color.statusCritical,
      selectionBg: c('selection_bg') ?? d.color.selectionBg,

      diffAdded: d.color.diffAdded,
      diffRemoved: d.color.diffRemoved,
      diffAddedWord: d.color.diffAddedWord,
      diffRemovedWord: d.color.diffRemovedWord,
      shellDollar: c('shell_dollar') ?? d.color.shellDollar
    },

    brand: {
      name: branding.agent_name ?? d.brand.name,
      icon: d.brand.icon,
      prompt: branding.prompt_symbol ?? d.brand.prompt,
      welcome: branding.welcome ?? d.brand.welcome,
      goodbye: branding.goodbye ?? d.brand.goodbye,
      tool: d.brand.tool
    },

    bannerLogo,
    bannerHero
  }
}