import { OA_H5_ORIGIN } from './config.js'
import { getToken } from './auth.js'

function trimSlash(s) {
  return String(s || '').replace(/\/$/, '')
}

/** 小程序基础库未必有 URLSearchParams，用手写 query 更稳 */
function buildQuery(params) {
  const parts = []
  Object.keys(params || {}).forEach((k) => {
    const v = params[k]
    if (v == null || v === '') return
    parts.push(encodeURIComponent(k) + '=' + encodeURIComponent(String(v)))
  })
  return parts.join('&')
}

function withQuery(path, params) {
  const base = trimSlash(OA_H5_ORIGIN) + path
  const qs = buildQuery(params)
  return qs ? base + '?' + qs : base
}

/** 水槽页 URL（须带小程序登录 token，供 OA H5 调 /api） */
export function buildFormSinkUrl() {
  const token = getToken()
  return withQuery('/oa-form-sink', token ? { token } : {})
}

/**
 * 关闭 web-view 失败时的小程序回退路径（须以 /pages/ 开头）。
 * 优先 query.returnPath；否则取页面栈上一页。
 */
export function resolveOaReturnPath(query) {
  const fromQuery = String((query && query.returnPath) || '').trim()
  if (fromQuery.indexOf('/pages/') === 0) return fromQuery
  try {
    const pages = typeof getCurrentPages === 'function' ? getCurrentPages() : []
    if (pages && pages.length >= 2) {
      const prev = pages[pages.length - 2]
      const route = prev && prev.route
      if (route) return '/' + String(route).replace(/^\//, '')
    }
  } catch (_) {
    /* ignore */
  }
  return '/pages/index/index'
}

/** 正式发起页 URL（与水槽同一套拼法，仅多 appId/draftId/fromInstanceId） */
export function buildOaStartUrl({ appId, draftId, fromInstanceId, returnPath } = {}) {
  const token = getToken()
  const params = {}
  if (appId) params.appId = appId
  if (draftId) params.draftId = draftId
  if (fromInstanceId) params.fromInstanceId = fromInstanceId
  if (returnPath) params.returnPath = returnPath
  if (token) params.token = token
  return withQuery('/oa-start', params)
}

/** 审批详情页 URL（须带 token；mode 为 view | approve；autoPrint=1 加载后自动调打印） */
export function buildOaDetailUrl({
  instanceId,
  taskId,
  mode,
  autoPrint,
  returnPath
} = {}) {
  const token = getToken()
  const params = {}
  if (instanceId) params.instanceId = instanceId
  if (taskId) params.taskId = taskId
  if (mode) params.mode = mode // view | approve
  if (autoPrint) params.autoPrint = '1'
  if (returnPath) params.returnPath = returnPath
  if (token) params.token = token
  return withQuery('/oa-detail', params)
}

const TITLE_KEY = 'oa_start_nav_title'

/** 跳转前缓存流程名（勿把中文放进 navigateTo / web-view URL，微信易白屏） */
export function stashOaStartTitle(name) {
  const t = String(name || '').trim()
  try {
    if (t) uni.setStorageSync(TITLE_KEY, t)
    else uni.removeStorageSync(TITLE_KEY)
  } catch (_) {
    /* ignore */
  }
}

export function takeOaStartTitle() {
  try {
    const t = String(uni.getStorageSync(TITLE_KEY) || '').trim()
    uni.removeStorageSync(TITLE_KEY)
    return t
  } catch (_) {
    return ''
  }
}

const DETAIL_TITLE_KEY = 'oa_detail_nav_title'

/** 跳转前缓存详情标题（勿把中文放进 navigateTo / web-view URL） */
export function stashOaDetailTitle(name) {
  const t = String(name || '').trim()
  try {
    if (t) uni.setStorageSync(DETAIL_TITLE_KEY, t)
    else uni.removeStorageSync(DETAIL_TITLE_KEY)
  } catch (_) {
    /* ignore */
  }
}

export function takeOaDetailTitle() {
  try {
    const t = String(uni.getStorageSync(DETAIL_TITLE_KEY) || '').trim()
    uni.removeStorageSync(DETAIL_TITLE_KEY)
    return t
  } catch (_) {
    return ''
  }
}