const request = require('request');
const TARGET_URL = 'https://api.line.me/v2/bot/message/push'
const MULTI_TARGET_URL = 'https://api.line.me/v2/bot/message/multicast'
const BROAD_TARGET_URL = 'https://api.line.me/v2/bot/message/broadcast'
const TOKEN = ''//Token, userid 입력후 사용
const USER_ID = '' 

const express = require('express');
const app = express();
const fetch = require('node-fetch');
const fs_apikey = require('fs');
const api_key = fs_apikey.readFileSync('apikey', 'ascii')
var cursor = ''
url2 = 'https://api.whale-alert.io/v1/transactions?api_key=' + api_key + '&cursor=' + cursor;
const options = {method: 'GET', headers: {Accept: 'application/json'}};

var TimeNow = parseInt((new Date()).getTime() / 1000)
var uts2time = new Date()

console.log(TimeNow)
fetch(url2, options) //커서값(갱신)을 얻기 위한 fetch
.then(res => res.json())
.then(json => {
    console.log(json)
    cursor = json.cursor
})
.catch((err) => {
    console.log('error : inital_fetch:'+err)
})
function chk_param(data, query_limit, callback){
    //query_limit (non_int) => return 0;
    //query_limit (int) => return query_limit;
    query_limit = parseInt(query_limit)
    if(isNaN(query_limit)){ return callback(data, 0)} 
    else {return callback(data, query_limit)}
}
function data_collector(data, limit){
    var ret = new Array();
    var str = '';

    //ret += '# of Transactions : ' + data.count + '\n'
    for(var i = 0; i < data.count; i++){
        uts2time.setTime(data.transactions[i].timestamp * 1000)
        str = /*'#' + (i+1)+*/'Time: ' + uts2time.toLocaleString() + '\nChainName: '+data.transactions[i].blockchain+'\nAmount: '+data.transactions[i].amount+' USD'
        if(data.transactions[i].amount > limit){ 
            //console.log(str)
           // ret += '\n\n' + str;
           o ={ 'type' : 'text',//message 형태에 맞춰 저장
                'text' : str}
           ret.push(o)
        }
        else{
            //console.log(str)
        }
    }
    return ret;
}
//5초 간격으로 fetch후 메시지 전송
setInterval(() => {
    fetch(url2+cursor, options)
    .then(res => res.json())
    .then(json => {
            //API usage limit
        console.log(json)
        if(json.result == 'error'){
        }
        else{
            cursor = json.cursor 
            var msg2user = chk_param(json, 0, data_collector) //fetch후 message Object 배열 리턴
            console.log('msg',msg2user)
            if(msg2user.length){
                var i = 0;
                for(i; i < msg2user.length; i++){
                    request.post(
                        {
                            url: TARGET_URL,
                            headers: {
                                'Authorization': `Bearer ${TOKEN}`
                            },
                            json: {
                                "to": `${USER_ID}`,
                                "messages":[msg2user[i]] //5개 초과하면 err나서 하나씩 넣음
                            }
                        },(error, response, body) => {
                            console.log(body, error)
                        });
                    }
                }
        }
    })
    .catch(err => {
        console.error('error: var:fu:' + err)
    })
}, 5000);