/* Progressive enhancement only: every page works without this file. */
(function () {
  "use strict";
  /* The band's active tab: the longest link that prefixes the path. */
  var p = location.pathname, best = null;
  document.querySelectorAll(".band a").forEach(function (a) {
    var h = a.getAttribute("href");
    if (h !== "/" && (p === h || p.indexOf(h + "/") === 0) && (!best || h.length > best.getAttribute("href").length)) best = a;
  });
  if (best) best.classList.add("on");

  /* Off-the-shelf editors, loaded only where a page asks for them:
     CodeMirror 6 over textarea.code, EasyMDE over textarea.md. */
  function load(src, css) {
    return new Promise(function (ok) {
      if (css) { var l = document.createElement("link"); l.rel = "stylesheet"; l.href = css; document.head.appendChild(l); }
      var s = document.createElement("script"); s.src = src; s.onload = ok; document.head.appendChild(s);
    });
  }
  if (document.querySelector("textarea.code")) load("/static/vendor/editor.js");
  var mds = document.querySelectorAll("textarea.md");
  if (mds.length) load("/static/vendor/easymde.min.js", "/static/vendor/easymde.min.css").then(function () {
    var E = window.EasyMDE;
    function b(name, action, text, title) { return { name: name, action: action, text: text, title: title, className: "mde-btn" }; }
    var toolbar = [b("bold", E.toggleBold, "B", "Bold"), b("italic", E.toggleItalic, "I", "Italic"), b("heading", E.toggleHeadingSmaller, "H", "Heading"), "|",
      b("code", E.toggleCodeBlock, "</>", "Code"), b("quote", E.toggleBlockquote, "“", "Quote"), b("ul", E.toggleUnorderedList, "•", "List"), b("ol", E.toggleOrderedList, "1.", "Numbered list"), "|",
      b("link", E.drawLink, "link", "Link"), "|", b("preview", E.togglePreview, "preview", "Preview")];
    mds.forEach(function (t) { new E({ element: t, spellChecker: false, status: false, forceSync: true, autoDownloadFontAwesome: false, toolbar: toolbar }); });
  });

  /* Theme switch in the header: dark, light, auto (follows the system); kept in the theme cookie. */
  var toggle = document.querySelector("[data-theme-toggle]");
  if (toggle) {
    var root = document.documentElement, order = ["dark", "light", "auto"], glyph = { dark: "◐", light: "☀", auto: "◑" };
    var show = function () {
      var p = root.dataset.themePref || "dark";
      toggle.title = "Theme: " + p + " (click to change)";
      toggle.setAttribute("aria-label", toggle.title);
      toggle.firstElementChild.textContent = glyph[p];
    };
    show();
    toggle.addEventListener("click", function () {
      var p = order[(order.indexOf(root.dataset.themePref || "dark") + 1) % order.length];
      document.cookie = "theme=" + p + "; path=/; max-age=31536000; samesite=lax";
      root.dataset.themePref = p;
      root.dataset.theme = p === "auto" ? (window.matchMedia && matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark") : p;
      show();
    });
  }

  /* Diffs: unified or split (remembered in the diff cookie), collapse all. */
  var diffs = document.querySelectorAll("table.code.diff");
  if (diffs.length) {
    var pane = function (tr, col, side) {
      var n = document.createElement("td"), t = document.createElement("td");
      n.className = "n"; t.className = "t" + (side === "right" ? " mid" : "");
      if (!tr) { n.className += " none"; t.className += " none"; return [n, t]; }
      var kind = tr.classList.contains("add") ? "add" : tr.classList.contains("del") ? "del" : "ctx";
      if (kind !== "ctx") { n.className += " " + kind; t.className += " " + kind; }
      n.textContent = tr.cells[col].textContent;
      t.innerHTML = tr.cells[3].innerHTML;
      // Line comments belong to the projected (right) side only.
      if (side === "left") t.querySelectorAll(".linecomment").forEach(function (d) { d.remove(); });
      return [n, t];
    };
    var split = function (table) {
      var s = document.createElement("table");
      s.className = "code diff split";
      s.innerHTML = '<colgroup><col class="n"><col><col class="n"><col></colgroup>';
      var rows = [].slice.call(table.rows), i = 0;
      var add = function (l, r) {
        var tr = s.insertRow();
        pane(l, 0, "left").concat(pane(r, 1, "right")).forEach(function (c) { tr.appendChild(c); });
      };
      while (i < rows.length) {
        var r = rows[i];
        if (r.classList.contains("del") || r.classList.contains("add")) {
          var dels = [], adds = [];
          while (i < rows.length && rows[i].classList.contains("del")) dels.push(rows[i++]);
          while (i < rows.length && rows[i].classList.contains("add")) adds.push(rows[i++]);
          for (var k = 0; k < Math.max(dels.length, adds.length); k++) add(dels[k], adds[k]);
          continue;
        }
        if (r.classList.contains("gap") || r.querySelector("td.thread")) {
          var tr = s.insertRow(), td = tr.insertCell();
          tr.className = r.className; td.colSpan = 4; td.className = r.cells[r.cells.length - 1].className;
          td.innerHTML = r.cells[r.cells.length - 1].innerHTML;
        } else {
          add(r, r);
        }
        i++;
      }
      return s;
    };
    var cookieMode = (document.cookie.match(/(?:^|; )diff=(split|unified)/) || [])[1] || "unified";
    var apply = function (mode) {
      diffs.forEach(function (t) {
        if (mode === "split" && !t._split) { t._split = split(t); t.parentNode.insertBefore(t._split, t.nextSibling); }
        t.hidden = mode === "split";
        if (t._split) t._split.hidden = mode !== "split";
      });
      document.querySelectorAll("[data-diff-mode]").forEach(function (a) { a.classList.toggle("on", a.getAttribute("data-diff-mode") === mode); });
    };
    document.querySelectorAll("[data-diff-modes], [data-diff-collapse]").forEach(function (e) { e.hidden = false; });
    document.querySelectorAll("[data-diff-mode]").forEach(function (a) {
      a.addEventListener("click", function (ev) {
        ev.preventDefault();
        var mode = a.getAttribute("data-diff-mode");
        document.cookie = "diff=" + mode + "; path=/; max-age=31536000; samesite=lax";
        apply(mode);
      });
    });
    document.querySelectorAll("[data-diff-collapse]").forEach(function (a) {
      a.addEventListener("click", function (ev) {
        ev.preventDefault();
        var files = document.querySelectorAll("details.file-diff"), anyOpen = [].some.call(files, function (d) { return d.open; });
        files.forEach(function (d) { d.open = !anyOpen; });
        a.textContent = anyOpen ? "expand all" : "collapse all";
      });
    });
    apply(cookieMode);
  }

  /* Settings pages: mark the section in view in the list of sections. */
  var navLinks = document.querySelectorAll(".section-nav a[href^='#']");
  if (navLinks.length && "IntersectionObserver" in window) {
    var byId = {};
    navLinks.forEach(function (a) { byId[a.getAttribute("href").slice(1)] = a; });
    var io = new IntersectionObserver(function (entries) {
      entries.forEach(function (e) {
        if (e.isIntersecting && byId[e.target.id]) {
          navLinks.forEach(function (a) { a.classList.remove("on"); });
          byId[e.target.id].classList.add("on");
        }
      });
    }, { rootMargin: "0px 0px -70% 0px" });
    Object.keys(byId).forEach(function (id) { var el = document.getElementById(id); if (el) io.observe(el); });
  }

  /* Copy buttons. */
  document.querySelectorAll("[data-copy]").forEach(function (b) {
    b.addEventListener("click", function () {
      navigator.clipboard.writeText(b.getAttribute("data-copy")).then(function () {
        var t = b.textContent; b.textContent = "copied"; setTimeout(function () { b.textContent = t; }, 1200);
      });
    });
  });

  /* Tree rows: the last change per entry, fetched after the page paints. */
  var tree = document.querySelector("table.tree[data-last]");
  if (tree) {
    var paths = [].map.call(tree.querySelectorAll("tr[data-path]"), function (r) { return r.getAttribute("data-path"); });
    if (paths.length) {
      fetch(tree.getAttribute("data-last") + "?paths=" + encodeURIComponent(paths.join(",")), { credentials: "same-origin" })
        .then(function (r) { return r.json(); })
        .then(function (rows) {
          rows.forEach(function (c) {
            var tr = tree.querySelector('tr[data-path="' + CSS.escape(c.path) + '"]');
            if (!tr) return;
            var a = tr.querySelector("td.last a"), t = tr.querySelector("td.age");
            if (a) { a.textContent = c.title; a.href = tree.getAttribute("data-change") + c.hash; }
            if (t) { t.textContent = c.ago; t.title = c.when; }
          });
        }).catch(function () {});
    }
  }

  /* Line anchors: #L12 or #L12-L20 highlight a range and clicking a number selects. */
  function mark() {
    var m = location.hash.match(/^#L(\d+)(?:-L(\d+))?$/);
    document.querySelectorAll("tr.hl").forEach(function (r) { r.classList.remove("hl"); });
    if (!m) { showBar(0, 0); return; }
    var a = +m[1], b = +(m[2] || m[1]);
    for (var i = Math.min(a, b); i <= Math.max(a, b); i++) {
      var row = document.getElementById("L" + i);
      if (row) row.classList.add("hl");
    }
    var first = document.getElementById("L" + Math.min(a, b));
    if (first && !mark.done) { first.scrollIntoView({ block: "center" }); mark.done = true; }
    showBar(Math.min(a, b), Math.max(a, b));
  }
  /* The bar for a selected range: copy its text, or a permalink to it. */
  var bar = document.querySelector(".linebar");
  function showBar(a, b) {
    if (!bar) return;
    bar.hidden = !a;
    if (!a) return;
    bar.querySelector("[data-linebar-label]").textContent = a === b ? "Line " + a : "Lines " + a + "–" + b;
    bar.setAttribute("data-range", a + "-" + b);
  }
  function flash(btn) { var t = btn.textContent; btn.textContent = "Copied"; setTimeout(function () { btn.textContent = t; }, 1200); }
  if (bar) {
    bar.querySelector("[data-copy-lines]").addEventListener("click", function (ev) {
      var r = bar.getAttribute("data-range").split("-"), out = [];
      for (var i = +r[0]; i <= +r[1]; i++) { var row = document.getElementById("L" + i); if (row) out.push(row.querySelector("td.t").textContent); }
      navigator.clipboard.writeText(out.join("\n") + "\n").then(function () { flash(ev.target); });
    });
    var pl = bar.querySelector("[data-copy-permalink]");
    if (pl) pl.addEventListener("click", function () {
      navigator.clipboard.writeText(new URL(document.body.getAttribute("data-permalink"), location.href).href + location.hash).then(function () { flash(pl); });
    });
  }
  function permalink() { var p = document.body.getAttribute("data-permalink"); return p ? p + location.hash : null; }
  window.addEventListener("hashchange", mark);
  mark();
  document.querySelectorAll("table.code td.n").forEach(function (td) {
    td.addEventListener("click", function (e) {
      var n = td.parentNode.id;
      if (e.shiftKey && location.hash.match(/^#L(\d+)/)) location.hash = location.hash.replace(/^#(L\d+).*/, "$1-" + n);
      else location.hash = n;
    });
  });

  /* Flow run page: statuses and new log lines while the run is live. */
  var liveUrl = document.body.getAttribute("data-flow-live");
  if (liveUrl) {
    var tick = function () {
      var after = [].map.call(document.querySelectorAll("details[data-job]"), function (d) {
        return d.getAttribute("data-job") + ":" + d.querySelector("[data-log]").getAttribute("data-seq");
      }).join(",");
      fetch(liveUrl + "?after=" + after, { headers: { accept: "application/json" } })
        .then(function (r) { return r.json(); })
        .then(function (s) {
          s.jobs.forEach(function (j) {
            var cls = "st-" + j.status;
            var node = document.querySelector("[data-job-node='" + j.id + "']");
            if (node) {
              node.setAttribute("class", "node " + cls);
              node.querySelector("[data-glyph]").textContent = j.glyph;
              node.querySelector("[data-meta]").textContent = j.status + " · " + j.duration;
            }
            var d = document.querySelector("details[data-job='" + j.id + "']");
            if (!d) return;
            d.className = "panel flow-job " + cls;
            var g = d.querySelector("summary [data-glyph]");
            g.className = "flow-glyph " + cls; g.textContent = j.glyph;
            d.querySelector("summary [data-meta]").textContent = j.status + (j.exit_code !== null ? " · exit " + j.exit_code : "") + " · " + j.duration;
            if (j.status === "running" || j.status === "failed") d.open = true;
            var log = d.querySelector("[data-log]");
            var stick = log.scrollTop + log.clientHeight >= log.scrollHeight - 4;
            j.lines.forEach(function (l) {
              var ln = document.createElement("span"); ln.className = "ln s-" + l.stream;
              var t = document.createElement("span"); t.className = "t"; t.textContent = (l.t / 1000).toFixed(1) + "s";
              ln.appendChild(t); ln.appendChild(document.createTextNode(l.text));
              log.appendChild(ln); log.appendChild(document.createTextNode("\n"));
              log.setAttribute("data-seq", l.seq);
            });
            if (stick && j.lines.length) log.scrollTop = log.scrollHeight;
          });
          var st = document.querySelector("[data-run-status]"); if (st) st.textContent = s.status;
          if (s.live) setTimeout(tick, 1500); else setTimeout(function () { location.reload(); }, 800);
        })
        .catch(function () { setTimeout(tick, 5000); });
    };
    setTimeout(tick, 1500);
  }

  /* Keyboard: / focuses search; g c / g p / g i jump; ? shows the sheet. */
  var pending = null;
  document.addEventListener("keydown", function (e) {
    if (e.target && /^(INPUT|TEXTAREA|SELECT)$/.test(e.target.tagName)) return;
    if (e.key === "/") { var s = document.querySelector("input[name=q]"); if (s) { e.preventDefault(); s.focus(); } return; }
    if (e.key === "y" && !e.ctrlKey && !e.metaKey && !e.altKey && permalink()) { history.replaceState(null, "", permalink()); pending = null; return; }
    if (e.key === "?") { var k = document.getElementById("keys"); if (k) k.hidden = !k.hidden; return; }
    var repo = document.body.getAttribute("data-repo");
    if (pending === "g" && repo) {
      var to = { c: "", p: "/proposals", i: "/issues", h: "/changes/" + (document.body.getAttribute("data-ref") || "main"), b: "/bookmarks", t: "/trust" }[e.key];
      if (to !== undefined) location.href = repo + to;
      pending = null; return;
    }
    pending = e.key === "g" ? "g" : null;
  });

  // Live conflict resolution (hub spec §6.10): who else is resolving this
  // conflict, their choices region by region (the last one wins), and the
  // resolution when someone commits it.
  var live = document.querySelector("[data-resolve-live]");
  if (live && window.EventSource && window.fetch) {
    var url = live.getAttribute("data-resolve-live"), csrf = live.getAttribute("data-csrf");
    var client = Math.random().toString(36).slice(2) + Date.now().toString(36);
    var present = document.querySelector("[data-live-present]"), landed = document.querySelector("[data-live-landed]");
    var applying = false;
    var fieldsOf = function (region) {
      return region === "keep"
        ? { radios: live.querySelectorAll('input[name="keep"]'), text: null }
        : { radios: live.querySelectorAll('input[name="r' + region + '"]'), text: live.querySelector('textarea[name="t' + region + '"]') };
    };
    var apply = function (region, c) {
      var f = fieldsOf(region);
      applying = true;
      f.radios.forEach(function (r) { r.checked = r.value === c.choice; });
      if (f.text && c.choice === "text") f.text.value = c.text;
      applying = false;
      var sec = f.radios.length ? f.radios[0].closest("section") : null;
      if (sec) sec.setAttribute("title", "chosen by " + c.by);
    };
    var send = function (region, choice, text) {
      fetch(url, { method: "POST", headers: { "content-type": "application/json" }, credentials: "same-origin",
        body: JSON.stringify({ _csrf: csrf, client: client, region: region, choice: choice, text: text || "" }) });
    };
    var timers = {};
    live.addEventListener("change", function (ev) {
      var t = ev.target;
      if (applying || !t.name || t.type !== "radio") return;
      var region = t.name === "keep" ? "keep" : t.name.slice(1);
      var ta = live.querySelector('textarea[name="t' + region + '"]');
      send(region, t.value, t.value === "text" && ta ? ta.value : "");
    });
    live.addEventListener("input", function (ev) {
      var t = ev.target;
      if (applying || t.tagName !== "TEXTAREA") return;
      var region = t.name.slice(1);
      live.querySelectorAll('input[name="r' + region + '"]').forEach(function (r) { r.checked = r.value === "text"; });
      clearTimeout(timers[region]);
      timers[region] = setTimeout(function () { send(region, "text", t.value); }, 400);
    });
    var es = new EventSource(url + "?client=" + encodeURIComponent(client));
    var showPresent = function (names) {
      present.hidden = names.length < 2;
      present.textContent = "Resolving together: " + names.join(", ") + ". Choices are shared as you make them; the last choice for a conflict wins.";
    };
    es.addEventListener("snapshot", function (e) {
      var d = JSON.parse(e.data);
      showPresent(d.present);
      Object.keys(d.choices).forEach(function (r) { apply(r, d.choices[r]); });
      if (d.keep) apply("keep", d.keep);
    });
    es.addEventListener("presence", function (e) { showPresent(JSON.parse(e.data).present); });
    es.addEventListener("choice", function (e) {
      var d = JSON.parse(e.data);
      if (d.client !== client) apply(d.region, d.choice);
    });
    es.addEventListener("landed", function (e) {
      var d = JSON.parse(e.data);
      es.close();
      landed.hidden = false;
      landed.textContent = "";
      landed.appendChild(document.createTextNode(d.by + " committed the resolution: "));
      var a = document.createElement("a");
      a.href = d.url;
      a.textContent = "see the change";
      landed.appendChild(a);
      live.querySelectorAll("input, textarea, button").forEach(function (x) { x.disabled = true; });
    });
  }

  // Swimlanes of a proposal's bookmark (hub spec §6.7): drag a change onto
  // another to plan a squash or a rebase. The hub only writes the plan;
  // the author's client carries it out and signs it.
  var plan = document.querySelector("[data-plan]");
  if (plan && window.fetch) {
    var panel = document.querySelector("[data-plan-panel]"), from = null, moved = false;
    plan.querySelectorAll("[data-change]").forEach(function (a) {
      a.style.cursor = "grab";
      a.addEventListener("pointerdown", function (ev) { from = a.getAttribute("data-change"); moved = false; ev.preventDefault(); });
      a.addEventListener("pointermove", function () { if (from) moved = true; });
      a.addEventListener("click", function (ev) { if (moved) ev.preventDefault(); });
    });
    document.addEventListener("pointerup", function (ev) {
      var start = from;
      from = null;
      if (!start) return;
      var el = document.elementFromPoint(ev.clientX, ev.clientY), onto = el && el.closest ? el.closest("[data-change]") : null;
      if (!onto || onto.getAttribute("data-change") === start) return;
      var body = new URLSearchParams({ _csrf: plan.getAttribute("data-csrf"), change: start, target: onto.getAttribute("data-change") });
      fetch(plan.getAttribute("data-plan"), { method: "POST", credentials: "same-origin", body: body })
        .then(function (r) { return r.json(); })
        .then(function (d) {
          panel.hidden = false;
          panel.textContent = "";
          if (d.error) { panel.textContent = d.error; return; }
          d.options.forEach(function (o) {
            var p = document.createElement("p");
            p.appendChild(document.createTextNode(o.summary + " "));
            var a = document.createElement("a");
            a.href = o.vscode;
            a.textContent = "Apply in VS Code";
            p.appendChild(a);
            var code = document.createElement("pre");
            code.className = "snippet";
            code.textContent = o.command;
            panel.appendChild(p);
            panel.appendChild(code);
          });
        });
    });
  }
})();