/**
 * System tray + minimize-to-tray (Phase O). When Settings.minimizeToTray is on,
 * closing the window hides it to the tray instead of quitting; the tray's "Quit"
 * really exits. The tray gives the app a background presence (a natural home for
 * the watched-source sync) and a quick show/quit menu.
 */
import { app, Tray, Menu, nativeImage, type BrowserWindow } from 'electron'
import { getAppIconPath } from './binaries'
import { FALLBACK_TRAY_PNGS } from './trayFallbackIcons'

let tray: Tray | null = null
// True once the user has chosen to really quit (tray menu, or app.quit from the
// updater) — lets the window 'close' handler tell "hide to tray" from "exit".
let quitting = false

export function isQuitting(): boolean {
  return quitting
}

export function markQuitting(): void {
  quitting = true
}

function show(getWindow: () => BrowserWindow | null): void {
  const win = getWindow()
  if (!win) return
  if (win.isMinimized()) win.restore()
  win.show()
  win.focus()
}

/** Create the tray icon + menu once. No-op if it already exists or the icon is missing. */
export function createTray(getWindow: () => BrowserWindow | null): void {
  if (tray) return
  // Prefer the real app icon; fall back to the embedded multi-resolution glyph
  // when no icon.ico ships, so minimize-to-tray always has a tray to restore
  // from — and stays crisp at 150%/200% DPI (W12). Without any icon the tray is
  // skipped (an empty image makes an invisible/unclickable Windows tray entry),
  // which would strand a minimized-to-tray window with no way back.
  let icon = nativeImage.createFromPath(getAppIconPath())
  if (icon.isEmpty()) {
    icon = nativeImage.createEmpty()
    for (const [scaleFactor, b64] of FALLBACK_TRAY_PNGS) {
      // dataURL (not `buffer`) so the PNG is decoded — `buffer` is raw bitmap data.
      icon.addRepresentation({ scaleFactor, dataURL: `data:image/png;base64,${b64}` })
    }
  }
  if (icon.isEmpty()) return

  tray = new Tray(icon)
  tray.setToolTip('AeroFetch')
  tray.setContextMenu(
    Menu.buildFromTemplate([
      { label: 'Show AeroFetch', click: () => show(getWindow) },
      { type: 'separator' },
      {
        label: 'Quit AeroFetch',
        click: () => {
          quitting = true
          app.quit()
        }
      }
    ])
  )
  tray.on('click', () => show(getWindow))
}