/**
 * System info utilities — replaces deprecated uni.getSystemInfoSync()
 * with the recommended granular APIs.
 */

interface SystemLayout {
  /** Status bar height in px */
  readonly statusBarHeight: number
  /** Window width in px */
  readonly windowWidth: number
  /** Custom nav bar height in px (status bar + title bar) */
  readonly navBarHeight: number
}

let cached: SystemLayout | null = null

/**
 * Returns layout dimensions using the new granular APIs.
 * Falls back to getSystemInfoSync only if the new APIs are unavailable.
 * Results are cached since these values never change during a session.
 */
export function getSystemLayout(): SystemLayout {
  if (cached) return cached

  let statusBarHeight = 20
  let windowWidth = 375

  try {
    // New recommended APIs (WeChat base lib >= 2.25.3)
    const windowInfo = uni.getWindowInfo()
    const deviceInfo = uni.getDeviceInfo()

    statusBarHeight = windowInfo.statusBarHeight ?? 20
    windowWidth = windowInfo.windowWidth ?? 375

    // Silence unused var — deviceInfo is here for future use
    void deviceInfo
  } catch {
    // Fallback for older base lib versions
    try {
      const sysInfo = uni.getSystemInfoSync()
      statusBarHeight = sysInfo.statusBarHeight ?? 20
      windowWidth = sysInfo.windowWidth ?? 375
    } catch {
      // Use defaults
    }
  }

  const navTitlePx = 88 * (windowWidth / 750)
  const navBarHeight = Math.round(statusBarHeight + navTitlePx)

  cached = { statusBarHeight, windowWidth, navBarHeight }
  return cached
}