AtCoder: All Samples At Once

Adds buttons to copy sample inputs/outputs
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// ==UserScript==
// @name         AtCoder: All Samples At Once
// @namespace    https://atcoder.jp/
// @version      2.2
// @name:ja      AtCoder: すべての入出力を一度でコピー
// @license MIT
// @description  Adds buttons to copy sample inputs/outputs
// @description:ja サンプル入出力を一度にコピーできるボタンを追加します
// @match        https://atcoder.jp/contests/*/tasks/*
// @grant        GM_setClipboard
// ==/UserScript==

(() => {
  'use strict';

  function g(t) {
    return [...document.querySelectorAll("h3")]
      .filter(h => h.textContent.includes(t))
      .map(h => {
        const p = h.parentElement.querySelector("pre");
        return p ? p.innerText.trim() : "";
      })
      .filter(Boolean);
  }

  function c(text) {
    if (typeof GM_setClipboard !== "undefined") {
      GM_setClipboard(text);
    } else {
      navigator.clipboard.writeText(text);
    }
  }

  function btn(title, text) {
    const b = document.createElement("button");
    b.textContent = title + " Copy";
    b.className = "btn btn-default btn-sm";
    b.onclick = () => {
      c(text);
      b.textContent = "Copied!";
      setTimeout(() => (b.textContent = title + " Copy"), 1000);
    };
    return b;
  }

  function findInsertPoint() {
    const headers = [...document.querySelectorAll("h3")];
    const inputHeader = headers.find(h => h.textContent.trim() === "入力");
    const outputHeader = headers.find(h => h.textContent.trim() === "出力");

    return outputHeader
      ? outputHeader.nextElementSibling
      : (inputHeader ? inputHeader.nextElementSibling : document.querySelector("#task-statement"));
  }

  const target = document.querySelector("#task-statement");
  if (!target || document.querySelector("#sample-copy-buttons")) return;

  const ins = g("入力例");
  const outs = g("出力例");

  const allIn = ins.length + "\n" + ins.join("\n");
  const allOut = "==========\n" + outs.join("\n==========\n") + "\n==========";

  const wrap = document.createElement("div");
  wrap.id = "sample-copy-buttons";
  wrap.style.margin = "10px 0";
  wrap.style.padding = "8px";
  wrap.style.border = "1px solid #ddd";
  wrap.style.background = "#fff";
  wrap.style.display = "flex";
  wrap.style.gap = "10px";
  wrap.style.alignItems = "center";

  wrap.appendChild(btn("Inputs", allIn));
  wrap.appendChild(btn("Outputs", allOut));

  // ----------------------------
  // Submit button (fixed)
  // ----------------------------

  const submit = document.createElement("a");
  submit.textContent = "Submit";
  submit.className = "btn btn-default btn-sm";
  submit.style.textDecoration = "none";
  submit.style.display = "inline-flex";
  submit.style.alignItems = "center";

  const contestMatch = location.href.match(/contests\/([^/]+)\//);
  const contest = contestMatch ? contestMatch[1] : "";

  // Reliable task detection (FIX)
  const taskInput = document.querySelector('input[name="data.TaskScreenName"]');
  const task = taskInput ? taskInput.value : "";

  submit.href = `https://atcoder.jp/contests/${contest}/submit?taskScreenName=${task}`;

  wrap.appendChild(submit);

  const insertPoint = findInsertPoint();

  if (insertPoint && insertPoint.parentNode) {
    insertPoint.parentNode.insertBefore(wrap, insertPoint.nextSibling);
  } else {
    target.appendChild(wrap);
  }

  // ----------------------------
  // Ctrl + Enter shortcut
  // ----------------------------

  document.addEventListener("keydown", (e) => {
    if (e.ctrlKey && e.key === "Enter") {
      const active = document.activeElement;
      const isTyping =
        active &&
        (active.tagName === "TEXTAREA" || active.tagName === "INPUT");

      if (isTyping) return;

      e.preventDefault();
      location.href = submit.href;
    }
  });

})();