/**
 * 单次「点击打印」任务的时间线（仅 JS，不依赖改 AAR）。
 * Logcat 搜关键词: [print-diag]
 * 预览页打印中可点「Log」弹窗整段复制截图。
 */

let t0 = 0
const lines: string[] = []
const MAX_LINES = 120

export function startPrintRunDiagnostics (): void {
  t0 = Date.now()
  lines.length = 0
  printRunDiag('session_start')
}

export function printRunDiag (msg: string, extra?: Record<string, string | number | boolean | undefined>): void {
  const dt = Date.now() - t0
  let s = `[+${dt}ms] ${msg}`
  if (extra && Object.keys(extra).length) {
    s += ` | ${Object.entries(extra)
      .filter(([, v]) => v !== undefined && v !== '')
      .map(([k, v]) => `${k}=${String(v)}`)
      .join(' ')}`
  }
  lines.push(s)
  if (lines.length > MAX_LINES) {
    lines.splice(0, lines.length - MAX_LINES)
  }
  try {
    console.warn('[print-diag]', s)
  } catch (_) {}
}

export function getPrintRunDiagnosticsText (): string {
  return lines.join('\n')
}

/** 弹窗安全长度（避免部分机型 showModal 截断过长无提示） */
export function getPrintRunDiagnosticsTextForModal (maxChars = 3800): string {
  const full = getPrintRunDiagnosticsText()
  if (full.length <= maxChars) return full
  return `...(start omitted, ${full.length - maxChars} chars)\n\n${full.slice(-maxChars)}`
}

const STORAGE_LAST_PRINT_DIAG = 'lastPrintRunDiagnostics'
const STORAGE_LAST_PRINT_DIAG_AT = 'lastPrintRunDiagnosticsAt'

/** 打印结束后写入 storage，Printer 页可查看最近一次任务时间线 */
export function persistPrintRunDiagnostics (): void {
  try {
    uni.setStorageSync(STORAGE_LAST_PRINT_DIAG, getPrintRunDiagnosticsText())
    uni.setStorageSync(STORAGE_LAST_PRINT_DIAG_AT, String(Date.now()))
  } catch (_) {}
}

export function getPersistedPrintRunDiagnostics (): string {
  try {
    return String(uni.getStorageSync(STORAGE_LAST_PRINT_DIAG) || '')
  } catch (_) {
    return ''
  }
}

export function getPersistedPrintRunDiagnosticsAt (): number {
  try {
    return Number(uni.getStorageSync(STORAGE_LAST_PRINT_DIAG_AT) || 0) || 0
  } catch (_) {
    return 0
  }
}