import type { ParsedKey } from '../parse-keypress.js'
import { TerminalEvent } from './terminal-event.js'

/** Keyboard event dispatched through the rendered tree via capture / bubble. */
export class KeyboardEvent extends TerminalEvent {
  readonly key: string
  readonly ctrl: boolean
  readonly shift: boolean
  readonly meta: boolean
  readonly superKey: boolean
  readonly fn: boolean

  constructor(parsedKey: ParsedKey) {
    super('keydown', { bubbles: true, cancelable: true })

    this.key = keyFromParsed(parsedKey)
    this.ctrl = parsedKey.ctrl
    this.shift = parsedKey.shift
    // Meta and Option both come over the wire as ESC-prefixed sequences
    // that parseKeypress can't always distinguish; we collapse them so
    // user code doesn't have to branch on the source terminal.
    this.meta = parsedKey.meta || parsedKey.option
    this.superKey = parsedKey.super
    this.fn = parsedKey.fn
  }
}

/** Pick the right `key` value out of a parsed keypress. */
function keyFromParsed(parsed: ParsedKey): string {
  const seq = parsed.sequence ?? ''
  const name = parsed.name ?? ''

  if (parsed.ctrl) return name

  if (seq.length === 1) {
    const code = seq.charCodeAt(0)
    if (code >= 0x20 && code !== 0x7f) return seq
  }

  return name || seq
}