// ==UserScript==
// @name         CF解题难度数据可视化
// @name:en      codeforces analytics 
// @namespace    https://codeforces.com/profile/tongwentao
// @version      1.0.0
// @description  显示某人Codeforces每个难度过了多少题
// @description:en Analyse Codeforces profiles
// @author       tongwentao
// @match        https://codeforces.com/profile/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// @require https://cdn.jsdelivr.net/npm/echarts@5.4.2/dist/echarts.min.js
// @license MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    function drawChart(res){
        var div='<div class="roundbox userActivityRoundBox borderTopRound borderBottomRound" id="twtschart" style="height:400px;"></div>';
        document.getElementById('pageContent').insertAdjacentHTML('beforeend',div);

        var chartDom = document.getElementById('twtschart');
        var myChart = echarts.init(chartDom);
        var option;

        var xData=[];
        var yData=[];
        xData=Object.keys(res);
        for(var key in xData){
            yData.push(res[xData[key]]);
        }
        option = {
            tooltip: {
                trigger: 'axis',
                axisPointer: {
                  type: 'shadow'
                }
              },
              grid: {
                left: '3%',
                right: '4%',
                bottom: '3%',
                containLabel: true
              },
              xAxis: [
                {
                  type: 'category',
                  data: xData,
                  axisTick: {
                    alignWithLabel: true
                  }
                }
              ],
              yAxis: [
                {
                  type: 'value'
                }
              ],
              series: [
                {
                  name: 'solved',
                  type: 'bar',
                  barWidth: '60%',
                  data: yData
                }
              ]
        };

        option && myChart.setOption(option);
    }

    var pathname = window.location.pathname;
    var handle = pathname.substring(pathname.lastIndexOf('/') + 1, pathname.length);
    var httpRequest = new XMLHttpRequest();
        httpRequest.open('GET', 'https://codeforces.com/api/user.status?handle='+handle, true);
        httpRequest.send();
        httpRequest.onreadystatechange = function () {
            if (httpRequest.readyState == 4 && httpRequest.status == 200) {
                var json=JSON.parse(httpRequest.responseText);
                var result=[];
                result=json.result;;
                var res={};
                for(var key in result){
                    if(result[key].verdict==="OK"){
                        var rating=result[key].problem.rating;
                        if(rating in res)
                            res[rating]++;
                        else
                            res[rating]=1;
                    }
                }
                console.log(res);
                drawChart(res);
            }
        };


})();