// apps/desktop/src/renderer/utils/format-hotkey.ts
// HotkeyBinding → 플랫폼별 표시 라벨 (segments + 결합 문자열).
// macOS: ⌘/⌥/⌃/⇧ + key, Windows/Linux: Ctrl/Alt/Win/Shift + key.
//
// 기존 binding.displayLabel은 키 녹화 시 만들어진 정적 문자열이라
// 플랫폼이 다르면 잘못 보임 — 이 헬퍼가 단일 진입점.

import type { HotkeyBinding } from '@d3ro/core/types'

export type Platform = 'darwin' | 'win32' | 'linux'

export function getPlatform(): Platform {
  const p = (window as { electronAPI?: { platform?: string } }).electronAPI?.platform
  if (p === 'darwin' || p === 'win32' || p === 'linux') return p
  // 폴백: SSR/테스트 환경에서는 navigator.platform로 추정.
  if (typeof navigator !== 'undefined' && /Mac/i.test(navigator.platform)) return 'darwin'
  return 'win32'
}

// keyCode → 키명. Windows VK_* 기준 + 일부 macOS 분기.
export function keyCodeToName(keyCode: number, platform: Platform = getPlatform()): string {
  // Modifier 표기 — 플랫폼별
  if (platform === 'darwin') {
    if (keyCode === 16 || keyCode === 160 || keyCode === 161) return '⇧'
    if (keyCode === 17 || keyCode === 162 || keyCode === 163) return '⌃'
    if (keyCode === 18 || keyCode === 164 || keyCode === 165) return '⌥'
    if (keyCode === 91 || keyCode === 92) return '⌘'
  } else {
    if (keyCode === 16 || keyCode === 160 || keyCode === 161) return 'Shift'
    if (keyCode === 17 || keyCode === 162 || keyCode === 163) return 'Ctrl'
    if (keyCode === 18 || keyCode === 164 || keyCode === 165) return 'Alt'
    if (keyCode === 91 || keyCode === 92) return 'Win'
  }

  // 공통 키
  switch (keyCode) {
    case 8: return 'Backspace'
    case 9: return 'Tab'
    case 13: return platform === 'darwin' ? '↩' : 'Enter'
    case 19: return 'Pause'
    case 20: return 'CapsLock'
    case 27: return 'Esc'
    case 32: return 'Space'
    case 33: return 'PgUp'
    case 34: return 'PgDn'
    case 35: return 'End'
    case 36: return 'Home'
    case 37: return '←'
    case 38: return '↑'
    case 39: return '→'
    case 40: return '↓'
    case 45: return 'Insert'
    case 46: return platform === 'darwin' ? '⌫' : 'Delete'
    case 186: return ';'
    case 187: return '='
    case 188: return ','
    case 189: return '-'
    case 190: return '.'
    case 191: return '/'
    case 192: return '`'
    case 219: return '['
    case 220: return '\\'
    case 221: return ']'
    case 222: return "'"
    default: break
  }

  // F1~F24
  if (keyCode >= 112 && keyCode <= 135) return `F${keyCode - 111}`
  // Numpad
  if (keyCode >= 96 && keyCode <= 105) return `Num${keyCode - 96}`
  // 알파벳/숫자
  if ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90)) {
    return String.fromCharCode(keyCode)
  }

  return `Key${keyCode}`
}

/**
 * binding을 플랫폼별 segment 배열로 변환.
 * 예) Mac: ['⌘', '⇧', '1'],  Win: ['Win', 'Shift', '1']
 *
 * 순서:
 * - macOS: ⌃ ⌥ ⇧ ⌘ + key (Apple 표준)
 * - Win/Linux: Ctrl Win Alt Shift + key
 */
export function formatHotkeySegments(binding: HotkeyBinding | null): string[] {
  if (!binding) return []
  const platform = getPlatform()
  const segments: string[] = []

  if (platform === 'darwin') {
    if (binding.ctrl) segments.push('⌃')
    if (binding.alt) segments.push('⌥')
    if (binding.shift) segments.push('⇧')
    if (binding.meta) segments.push('⌘')
  } else {
    if (binding.ctrl) segments.push('Ctrl')
    if (binding.meta) segments.push('Win')
    if (binding.alt) segments.push('Alt')
    if (binding.shift) segments.push('Shift')
  }

  segments.push(keyCodeToName(binding.keyCode, platform))
  return segments
}

/**
 * 사람이 읽기 위한 단일 문자열 형태.
 * macOS: '⌘⇧1' (구분자 없음 — Apple 표준)
 * Win/Linux: 'Ctrl + Shift + 1'
 */
export function formatHotkeyLabel(binding: HotkeyBinding | null): string {
  const segments = formatHotkeySegments(binding)
  if (segments.length === 0) return ''
  const platform = getPlatform()
  return platform === 'darwin' ? segments.join('') : segments.join(' + ')
}