const RESET = '\x1b[0m'
const BOLD = '\x1b[1m'
const DIM = '\x1b[2m'
const BRAND_BLUE = '\x1b[38;2;42;95;255m'
const GREEN = '\x1b[38;5;84m'
const RED = '\x1b[38;5;203m'

function paint(code: string, value: string): string {
  if (!process.stdout.isTTY || process.env.NO_COLOR !== undefined) return value
  return `${code}${value}${RESET}`
}

export function accent(value: string): string {
  return paint(BRAND_BLUE, value)
}

export function bold(value: string): string {
  return paint(BOLD, value)
}

export function muted(value: string): string {
  return paint(DIM, value)
}

export function success(value: string): string {
  return paint(GREEN, value)
}

export function failure(value: string): string {
  return paint(RED, value)
}

export function printBrand(subtitle?: string): void {
  console.log()
  console.log(`  ${accent('◤◢')} ${bold('rnx')}`)
  if (subtitle) console.log(`  ${muted(subtitle)}`)
}

export function printPromptBlock(title: string, description: string[]): void {
  console.log(`\n  ${accent('◆')} ${bold(title)}`)
  for (const line of description) console.log(`    ${muted(line)}`)
}

export async function withSpinner<T>(label: string, run: () => Promise<T>): Promise<T> {
  if (!process.stdout.isTTY) {
    console.log(`  ${label}...`)
    return run()
  }

  const frames = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏']
  let index = 0
  const draw = () => {
    process.stdout.write(`\r\x1b[2K  ${accent(frames[index++ % frames.length])} ${label}`)
  }
  draw()
  const timer = setInterval(draw, 80)

  try {
    const result = await run()
    clearInterval(timer)
    process.stdout.write(`\r\x1b[2K  ${success('✓')} ${label}\n`)
    return result
  } catch (error) {
    clearInterval(timer)
    process.stdout.write(`\r\x1b[2K  ${failure('×')} ${label}\n`)
    throw error
  }
}