/**

* DEC (Digital Equipment Corporation) Private Mode Sequences

*

* DEC private modes use CSI ? N h (set) and CSI ? N l (reset) format.

* These are terminal-specific extensions to the ANSI standard.

*/

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

/**

* DEC private mode numbers

*/

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

/** Generate CSI ? N h sequence (set mode) */

export function decset(mode: number): string {

return csi(`?${mode}h`)

}

/** Generate CSI ? N l sequence (reset mode) */

export function decreset(mode: number): string {

return csi(`?${mode}l`)

}

// Pre-generated sequences for common modes

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: 1000 reports button press/release/wheel, 1002 adds drag

// events (button-motion), 1003 adds all-motion (no button held — for

// hover), 1006 uses SGR format (CSI < btn;col;row M/m) instead of legacy

// X10 bytes. Combined: wheel + click/drag for selection + hover.

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)