'use strict'
const AntCloudClient = require('./base.js')

const b64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const b64pad = "=";
const BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz";
function int2char(n) { return BI_RM.charAt(n); }

// convert a base64 string to hex
function b64tohex(s) {
  let ret = ""
  let i;
  let k = 0; // b64 state, 0-3
  let slop;
  let v;
  for(i = 0; i < s.length; ++i) {
    if(s.charAt(i) == b64pad) break;
    v = b64map.indexOf(s.charAt(i));
    if(v < 0) continue;
    if(k == 0) {
      ret += int2char(v >> 2);
      slop = v & 3;
      k = 1;
    }
    else if(k == 1) {
      ret += int2char((slop << 2) | (v >> 4));
      slop = v & 0xf;
      k = 2;
    }
    else if(k == 2) {
      ret += int2char(slop);
      ret += int2char(v >> 2);
      slop = v & 3;
      k = 3;
    }
    else {
      ret += int2char((slop << 2) | (v >> 4));
      ret += int2char(v & 0xf);
      k = 0;
    }
  }
  if(k == 1)
    ret += int2char(slop << 2);
  return ret;
}

module.exports = async (ctx) => {
  const args = ctx.args || {}
  const bizid = args.bizid || ''
  const method = args.method || ''
  const param = args.param || {}

  const user = await ctx.basement.openapi.alipay.exec('alipay.user.info.share')
  const userId = user.userId

  // 初始化客户端
  const client = new AntCloudClient({
    endpoint: 'https://prodapigw.cloud.alipay.com/gateway.do',
    accessKey: '${accessKey}',
    accessSecret: '${accessSecret}'
  })

  // 构建请求
  const request = {
    version: '1.0',
    // product_instance_id: 'baas-account-prod',
    // region_name: 'CN-HANGZHOU-FINANCE',
  }

  if (method === 'create') {
    return client.execute({
      account: {
        bizid: bizid,
        entity_info_type: '0',
        entity_info_value: userId,
        full_name: userId,
        status: '1',
        target_name: userId,
        type: '0',
        uid: userId,
      },
      method: 'baas.account.mapping.start',
      product_instance_id: 'baas-account-prod',
      region_name: 'CN-HANGZHOU-FINANCE',
      ...request
    })
  }

  // 验证用户是否有账户映射
  return client.execute({
    bizid: bizid,
    uid: userId,
    method: 'baas.account.mapping.query',
    product_instance_id: 'baas-account-prod',
    region_name: 'CN-HANGZHOU-FINANCE',
    ...request
  }).then((resp) => {
    if (resp.result_code === 'ACCOUNT_NOT_MAPPING' || 
    (resp.result_code === 'OK' && resp.data && resp.data.binding_status !== 2)) {
      // 给用户创建账户映射
      return client.execute({
        account: {
          bizid: bizid,
          entity_info_type: '0',
          entity_info_value: userId,
          full_name: userId,
          status: '1',
          target_name: userId,
          type: '0',
          uid: userId,
        },
        method: 'baas.account.mapping.start',
        product_instance_id: 'baas-account-prod',
        region_name: 'CN-HANGZHOU-FINANCE',
        ...request
      })
    }
    return resp
  }).then(() => {
    const sdkData = param.data || {params: {transaction: null}}
    const transaction = sdkData.params.transaction
    let P = null
    if (param.isSign && transaction) {
      // 通过账户映射签名
      P = client.execute({
        bizid: bizid,
        uid: userId,
        algorithm: 'ecdsa',
        data: transaction.hash || '',
        method: 'baas.account.signature.start',
        product_instance_id: 'baas-account-prod',
        region_name: 'CN-HANGZHOU-FINANCE',
        ...request
      }).then((resp) => {
        if (resp.result_code === 'OK') {
          transaction.signature = [b64tohex(resp.signature)]
          sdkData.params.transaction = transaction
        }
        return sdkData
      })
    } else {
      P = new Promise((resolve) => {
        resolve(sdkData)
      })
    }
    return P
  })
  .then((sdkData) => {
    // 调用合约代理接口
    return client.execute({
      bizid: bizid,
      body: JSON.stringify(sdkData),
      method: 'baas.contract.delegate.exec',
      product_instance_id: 'contract-dev-prod',
      // region_name: 'CN-HANGZHOU-FINANCE',
      ...request
    })
  })
  .then((resp) => {
    return resp
  })
}