const STORAGE_KEY = 'app_runtime_logs'
const MAX_LOGS = 800

let logs = []
let installed = false
let persistTimer = null
const nativeConsole = {
  log: typeof console.log === 'function' ? console.log.bind(console) : () => {},
  info: typeof console.info === 'function' ? console.info.bind(console) : null,
  warn: typeof console.warn === 'function' ? console.warn.bind(console) : null,
  error: typeof console.error === 'function' ? console.error.bind(console) : null,
}

const loadFromStorage = () => {
  try {
    const raw = uni.getStorageSync(STORAGE_KEY)
    if (!raw) {
      logs = []
      return
    }
    const parsed = typeof raw === 'string' ? JSON.parse(raw) : raw
    logs = Array.isArray(parsed) ? parsed : []
  } catch (error) {
    logs = []
  }
}

const persistNow = () => {
  if (persistTimer) {
    clearTimeout(persistTimer)
    persistTimer = null
  }
  try {
    uni.setStorageSync(STORAGE_KEY, JSON.stringify(logs))
  } catch (error) {
    // ignore persist errors
  }
}

const schedulePersist = () => {
  if (persistTimer) return
  persistTimer = setTimeout(() => {
    persistTimer = null
    persistNow()
  }, 300)
}

const formatArg = (arg) => {
  if (arg === null) return 'null'
  if (arg === undefined) return 'undefined'
  if (typeof arg === 'string') return arg
  if (typeof arg === 'number' || typeof arg === 'boolean') return String(arg)
  try {
    return JSON.stringify(arg)
  } catch (error) {
    return String(arg)
  }
}

const pad = (n) => String(n).padStart(2, '0')

const formatTime = (date = new Date()) => {
  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}.${String(date.getMilliseconds()).padStart(3, '0')}`
}

export const appendLog = (level, args) => {
  const message = (Array.isArray(args) ? args : [args])
    .map(formatArg)
    .join(' ')
  logs.push({
    time: formatTime(),
    level: level || 'log',
    message,
  })
  if (logs.length > MAX_LOGS) {
    logs = logs.slice(logs.length - MAX_LOGS)
  }
  schedulePersist()
}

/** 业务关键日志：写入本地日志，同时输出到原生 console（避免二次拦截） */
export const appLog = (level, ...args) => {
  const lv = level || 'info'
  appendLog(lv, args)
  const printer = nativeConsole[lv] || nativeConsole.log || (() => {})
  try {
    printer(...args)
  } catch (error) {
    // ignore
  }
}

export const flushLogs = () => {
  persistNow()
}

export const getLogs = () => {
  if (!logs.length) {
    loadFromStorage()
  }
  return logs.slice()
}

export const getLogsText = () => {
  return getLogs()
    .map((item) => `[${item.time}] [${item.level}] ${item.message}`)
    .join('\n')
}

export const clearLogs = () => {
  logs = []
  try {
    uni.removeStorageSync(STORAGE_KEY)
  } catch (error) {
    // ignore
  }
}

export const installAppLogger = () => {
  if (installed) return
  installed = true
  loadFromStorage()

  nativeConsole.log = console.log.bind(console)
  nativeConsole.info = console.info ? console.info.bind(console) : nativeConsole.log
  nativeConsole.warn = console.warn.bind(console)
  nativeConsole.error = console.error.bind(console)

  const wrap = (level, original) => {
    return (...args) => {
      try {
        appendLog(level, args)
      } catch (error) {
        // ignore logger errors
      }
      if (typeof original === 'function') {
        return original.apply(console, args)
      }
    }
  }

  console.log = wrap('log', nativeConsole.log)
  console.info = wrap('info', nativeConsole.info)
  console.warn = wrap('warn', nativeConsole.warn)
  console.error = wrap('error', nativeConsole.error)

  appLog('info', '[appLog] logger installed')
}