// ============================================================================
// SVELTUI - CURSOR MODULE
// Controls native terminal cursor visibility and style
//
// Note: Native cursor COLOR cannot be controlled via ANSI - that's set by
// the terminal emulator. For custom colored cursors, use the <Cursor> component.
//
// Usage:
//   import { cursor } from 'sveltui'
//   cursor.hide()
//   cursor.show()
//   cursor.setStyle('bar')
// ============================================================================

import { writeStdout } from '../utils/bun-output.ts'
import * as ANSI from '../utils/ansi-codes.ts'

// ============================================================================
// TYPES
// ============================================================================

export type CursorStyle = 'block' | 'underline' | 'bar' | 'default'
export type CursorVisibility = 'visible' | 'hidden'

export interface CursorOptions {
  /** Initial visibility - 'visible' or 'hidden' */
  visibility?: CursorVisibility
  /** Cursor style - 'block', 'underline', 'bar', or 'default' */
  style?: CursorStyle
  /** Whether cursor blinks (terminal native blink) */
  blink?: boolean
}

// ============================================================================
// STATE
// ============================================================================

let _visible = true
let _style: CursorStyle = 'default'
let _blink = true

// ============================================================================
// STYLE MAPPING
// ============================================================================

function getStyleCode(style: CursorStyle, blink: boolean): string {
  switch (style) {
    case 'block':
      return blink ? ANSI.CURSOR_BLOCK_BLINK : ANSI.CURSOR_BLOCK
    case 'underline':
      return blink ? ANSI.CURSOR_UNDERLINE_BLINK : ANSI.CURSOR_UNDERLINE
    case 'bar':
      return blink ? ANSI.CURSOR_BAR_BLINK : ANSI.CURSOR_BAR
    case 'default':
    default:
      return ANSI.CURSOR_DEFAULT
  }
}

// ============================================================================
// PUBLIC API
// ============================================================================

/**
 * Hide the native terminal cursor
 */
export function hide(): void {
  _visible = false
  writeStdout(ANSI.HIDE_CURSOR)
}

/**
 * Show the native terminal cursor
 */
export function show(): void {
  _visible = true
  writeStdout(ANSI.SHOW_CURSOR)
}

/**
 * Toggle cursor visibility
 */
export function toggle(): void {
  if (_visible) {
    hide()
  } else {
    show()
  }
}

/**
 * Set cursor style (block, underline, bar, or default)
 */
export function setStyle(style: CursorStyle): void {
  _style = style
  writeStdout(getStyleCode(_style, _blink))
}

/**
 * Set cursor blink on/off
 */
export function setBlink(blink: boolean): void {
  _blink = blink
  writeStdout(getStyleCode(_style, _blink))
}

/**
 * Configure cursor with multiple options at once
 */
export function configure(options: CursorOptions): void {
  if (options.style !== undefined) {
    _style = options.style
  }
  if (options.blink !== undefined) {
    _blink = options.blink
  }
  if (options.visibility !== undefined) {
    _visible = options.visibility === 'visible'
  }

  // Apply style first, then visibility
  writeStdout(getStyleCode(_style, _blink))
  writeStdout(_visible ? ANSI.SHOW_CURSOR : ANSI.HIDE_CURSOR)
}

/**
 * Reset cursor to default terminal style and show it
 */
export function reset(): void {
  _style = 'default'
  _blink = true
  _visible = true
  writeStdout(ANSI.CURSOR_DEFAULT)
  writeStdout(ANSI.SHOW_CURSOR)
}

/**
 * Get current cursor state (for debugging/introspection)
 */
export function getState(): { visible: boolean; style: CursorStyle; blink: boolean } {
  return {
    visible: _visible,
    style: _style,
    blink: _blink,
  }
}

// ============================================================================
// EXPORT AS OBJECT (cursor.hide(), cursor.show(), etc.)
// ============================================================================

export const cursor = {
  hide,
  show,
  toggle,
  setStyle,
  setBlink,
  configure,
  reset,
  getState,

  // Getters for current state
  get visible() {
    return _visible
  },
  get style() {
    return _style
  },
  get blink() {
    return _blink
  },
}