/** DEC private-mode sequences (`CSI ? N h` / `CSI ? N l`). */

import { csi } from './csi.js'

/** DEC private mode numbers we care about. */
export const DEC = {
  CURSOR_VISIBLE: 25,
  ALT_SCREEN: 47,
  ALT_SCREEN_CLEAR: 1049,
  MOUSE_NORMAL: 1000,
  MOUSE_BUTTON: 1002,
  MOUSE_ANY: 1003,
  MOUSE_SGR: 1006,
  FOCUS_EVENTS: 1004,
  BRACKETED_PASTE: 2004,
  SYNCHRONIZED_UPDATE: 2026,
} as const

/** Build a set-private-mode sequence: `CSI ? N h`. */
export function decset(mode: number): string {
  return csi(`?${mode}h`)
}

/** Build a reset-private-mode sequence: `CSI ? N l`. */
export function decreset(mode: number): string {
  return csi(`?${mode}l`)
}

// Pre-generated sequences for the modes the renderer toggles every frame.
// Computing them once at module load saves the `csi` allocation per write.
export const BSU = decset(DEC.SYNCHRONIZED_UPDATE)
export const ESU = decreset(DEC.SYNCHRONIZED_UPDATE)
export const EBP = decset(DEC.BRACKETED_PASTE)
export const DBP = decreset(DEC.BRACKETED_PASTE)
export const EFE = decset(DEC.FOCUS_EVENTS)
export const DFE = decreset(DEC.FOCUS_EVENTS)
export const SHOW_CURSOR = decset(DEC.CURSOR_VISIBLE)
export const HIDE_CURSOR = decreset(DEC.CURSOR_VISIBLE)
export const ENTER_ALT_SCREEN = decset(DEC.ALT_SCREEN_CLEAR)
export const EXIT_ALT_SCREEN = decreset(DEC.ALT_SCREEN_CLEAR)

/** Mouse tracking enable bundle. */
export const ENABLE_MOUSE_TRACKING =
  decset(DEC.MOUSE_NORMAL) +
  decset(DEC.MOUSE_BUTTON) +
  decset(DEC.MOUSE_ANY) +
  decset(DEC.MOUSE_SGR)
export const DISABLE_MOUSE_TRACKING =
  decreset(DEC.MOUSE_SGR) +
  decreset(DEC.MOUSE_ANY) +
  decreset(DEC.MOUSE_BUTTON) +
  decreset(DEC.MOUSE_NORMAL)