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86 lines
2.5 KiB
86 lines
2.5 KiB
const googt = require('google-trends-api');
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const Promise = require('promise');
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const DAY = 1000 * 60 * 60 * 24; // 1 day in milliseconds
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const YEAR = DAY * 365; // 1 year in milliseconds
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const GEO = 'US'; //the scope of the trends
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/**
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desc: helper function for getYearStats, gets list of popularity for days in
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the month.
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*/
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function getMonthStats(word, month){
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return new Promise(function(resolve, reject){
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//set up query for 1 month length
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googt.interestOverTime({
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keyword:word,
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startTime:new Date(Date.now() - (YEAR * month/12)),
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endTime:new Date(Date.now() - (YEAR * (month-1)/12))
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}).then(function(results){
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//parse the json, fill return array w tuples of date + value
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var times = JSON.parse(results).default.timelineData;
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var ret = [];
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for(var i = 0; i < times.length; ++i){
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var tup = new Object();
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tup.time = times[i].formattedTime;
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tup.value = times[i].value[0];
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ret[i] = tup;
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}
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resolve(ret);
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});
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});
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}
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module.exports=
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{
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/*
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desc: returns an integer score for the word over the day
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*/
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getPopularity: function(word)
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{
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//must be a promise since call to trends API is async
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return new Promise(function(resolve, reject){
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//specifies the keyword, time interval, granularity, and region
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googt.interestOverTime({keyword:word,
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startTime:new Date(Date.now() - DAY),granularTimeResolution:true,
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geo:GEO
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})
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.then(function(results){
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//turn into json object
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data = JSON.parse(results).default.timelineData;
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//add up values
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var total = 0;
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data.forEach(function(element){
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total += element.value[0];
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})
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//tell function to return
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resolve(total);
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}).catch(function(err){
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reject("Google Trends Query Failed");
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});
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});
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},
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/**
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desc: returns a list of tuples (date, value) representing word's
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popularity for the past year
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*/
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getYearStats: async function(word){
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var ret = [];
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for (var i = 9; i > 0; --i) {
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await getMonthStats(word,i).then(function(data){
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ret = ret.concat(data);
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});
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console.log(i);
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}
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return ret;
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}
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};
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