download_best_answers.js

var problems_list;
fetch("https://scoreserver.ictsc.net/api/problems")
		.then( problem_json => { return problem_json.json() } )
		.then( problems => {
			problems_list = problems.data.problems;
			return problems_list.map( problem => {
				return "https://scoreserver.ictsc.net/api/problems/" + problem.id + "/answers"
			})
			.map( url => {
				return fetch(url)
			})
		})
		.then( answer_fetch => {
			return Promise.all(answer_fetch)
		})
		.then( answer_resps => {
			return answer_resps.map( answer_resp => {
				return answer_resp.json()
			})
		})
		.then( answer_jsons => {
			return Promise.all(answer_jsons)
		})
		.then( prob_answers => {
			prob_answers.map( answers => {
				return answers.data.answers.sort( (a,b) => {
					return a.point < b.point
				})[0]
			}).map( top_answer => {
				return {
					code: problems_list.find(prob => {
						return prob.id == top_answer.problem_id
					}).code,
					id: top_answer.problem_id,
					body: top_answer.body}
			}).forEach( top_answer => {
				let url = URL.createObjectURL(new Blob([top_answer.body], {
				  type: "text/markdown"
				}))
				const download_button = document.createElement("a");
				download_button.innerText = "解答ダウンロード"
				download_button.download = top_answer.code + ".md";
				download_button.href = "#";
				download_button.style.textDecoration = "underline";
				download_button.addEventListener('click', (e) => {e.target.href=url})
				document.querySelector(`li:has(a[href='/problems/${top_answer.code}'])`).appendChild(download_button)
			})
		})