/**
 * @description 从扫码结果中提取打卡接口所需参数
 * @param {string} rawScanResult - 微信扫码返回的原始结果，可能是完整URL，也可能是纯查询串
 * @returns {{activityId:string, detailId:string, rawParams:Object}}
 */
export const parseScanCheckinParams = (rawScanResult = '') => {
  const normalized = String(rawScanResult || '').trim()

  if (!normalized) {
    return {
      activityId: '',
      detailId: '',
      rawParams: {},
    }
  }

  const querySource = extractQuerySource(normalized)
  const rawParams = parseQueryString(querySource)

  return {
    activityId: pickFirstAvailableValue(rawParams, ['activity_id', 'activityId', 'id']),
    detailId: pickFirstAvailableValue(rawParams, ['detail_id', 'detailId', 'stage_id', 'stageId']),
    rawParams,
  }
}

const extractQuerySource = input => {
  const questionMarkIndex = input.indexOf('?')

  if (questionMarkIndex >= 0) {
    return input.slice(questionMarkIndex + 1)
  }

  return input
}

const parseQueryString = (queryString = '') => {
  const hashRemoved = String(queryString || '').split('#')[0]
  const pairs = hashRemoved.split('&').filter(Boolean)

  return pairs.reduce((result, pair) => {
    const [rawKey, ...rest] = pair.split('=')
    const rawValue = rest.join('=')
    const key = safeDecodeURIComponent(rawKey)
    const value = safeDecodeURIComponent(rawValue)

    if (key) {
      result[key] = value
    }

    return result
  }, {})
}

const pickFirstAvailableValue = (params, keys = []) => {
  for (const key of keys) {
    const value = params?.[key]
    if (value !== '' && value !== undefined && value !== null) {
      return String(value)
    }
  }

  return ''
}

const safeDecodeURIComponent = (value = '') => {
  try {
    return decodeURIComponent(String(value || '').replace(/\+/g, '%20'))
  } catch (error) {
    return String(value || '')
  }
}