(function () {
  var POLL_MS = 30000;

  function cookieEdition() {
    var m = document.cookie.match(/(?:^|; )tdpd_edition=([^;]*)/);
    if (!m) return "flask";
    try {
      return decodeURIComponent(m[1]) || "flask";
    } catch (e) {
      return "flask";
    }
  }

  function esc(s) {
    return String(s)
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;");
  }

  /** ISO → "YYYY-MM-DD HH:MM" (date required; clock-only was misleading across days). */
  function shortTime(iso) {
    if (!iso) return "";
    var m = String(iso).match(
      /^(\d{4}-\d{2}-\d{2})T(\d{2}:\d{2})(?::\d{2})?/
    );
    if (m) return m[1] + " " + m[2];
    return String(iso).slice(0, 16).replace("T", " ");
  }

  function fmtBuildSec(sec) {
    if (sec == null || sec === "") return "";
    var n = Number(sec);
    if (!isFinite(n)) return "";
    if (n < 10) return n.toFixed(1) + "s";
    return Math.round(n) + "s";
  }

  function metaHtml(row) {
    var tip = row.tip || "";
    var tipTime = row.tip_time || "";
    var builtAt = row.built_at || "";
    var buildSec = row.build_seconds;
    var parts = [];
    if (tip) parts.push(esc("@" + tip));
    if (tipTime) parts.push(esc("tip " + shortTime(tipTime)));
    if (buildSec != null && buildSec !== "")
      parts.push(esc("build " + fmtBuildSec(buildSec)));
    if (builtAt) parts.push(esc("at " + shortTime(builtAt)));
    // vs main: +grün / −rot (omit on main / when both zero absent)
    var plus = row.vs_main_plus;
    var minus = row.vs_main_minus;
    if (plus != null || minus != null) {
      var p = plus == null ? 0 : Number(plus);
      var m = minus == null ? 0 : Number(minus);
      if (isFinite(p) && isFinite(m) && (p > 0 || m > 0 || row.branch !== "main")) {
        parts.push(
          '<span class="diff-plus">+' +
            esc(String(p)) +
            '</span> <span class="diff-minus">−' +
            esc(String(m)) +
            "</span>"
        );
      }
    }
    return parts.join(" · ");
  }

  function rowTitle(row, buildSec) {
    var tip = row.tip || "";
    var tipTime = row.tip_time || "";
    var plus = row.vs_main_plus;
    var minus = row.vs_main_minus;
    var vs = "";
    if (plus != null || minus != null) {
      vs =
        " vs main +" +
        String(plus == null ? 0 : plus) +
        "/−" +
        String(minus == null ? 0 : minus);
    }
    return (
      "Switch build to " +
      (row.branch || "") +
      (tip ? " @ " + tip : "") +
      (tipTime ? " tip=" + tipTime : "") +
      (buildSec != null && buildSec !== ""
        ? " build=" + fmtBuildSec(buildSec)
        : "") +
      vs
    );
  }

  function structureKey(list) {
    var parts = [];
    for (var i = 0; i < list.length; i++) {
      var row = list[i];
      parts.push(
        (row.edition || "") +
          "\t" +
          (row.branch || "") +
          "\t" +
          (row.prefix || "") +
          "\t" +
          (row.parent || "")
      );
    }
    return parts.join("\n");
  }

  function markActive(root, edition) {
    var links = root.querySelectorAll("a[data-edition]");
    for (var i = 0; i < links.length; i++) {
      var a = links[i];
      var ed = a.getAttribute("data-edition");
      var on =
        ed === edition ||
        (edition === "flask" && a.getAttribute("data-default") === "1");
      if (on) {
        a.classList.add("is-active");
        a.setAttribute("aria-current", "page");
      } else {
        a.classList.remove("is-active");
        a.removeAttribute("aria-current");
      }
    }
  }

  function timingText(timing, listLen) {
    if (!timing || timing.wall_seconds == null) return "";
    return (
      "last full pass ~" +
      String(timing.wall_seconds) +
      "s · built " +
      String(timing.built || 0) +
      " / skipped " +
      String(timing.skipped || 0) +
      " / " +
      String(timing.branches || listLen)
    );
  }

  function updateValues(mount, data) {
    var list = (data && data.branches) || [];
    var defaultBranch = (data && data.default_branch) || "feat/website-views";
    var timing = (data && data.rebuild_timing) || null;
    var rows = mount.querySelectorAll("a.cascade-tree-row[data-edition]");
    if (rows.length !== list.length) return false;
    for (var i = 0; i < list.length; i++) {
      var row = list[i];
      var a = rows[i];
      if (a.getAttribute("data-edition") !== (row.edition || "")) return false;
      if (a.getAttribute("data-branch") !== (row.branch || "")) return false;
      var tipHtml = metaHtml(row);
      var tipEl = a.querySelector(".tip");
      var wantTip = tipHtml ? " " + tipHtml : "";
      if (tipEl) {
        if (tipEl.innerHTML !== wantTip) tipEl.innerHTML = wantTip;
      } else if (wantTip) {
        tipEl = document.createElement("span");
        tipEl.className = "tip";
        tipEl.innerHTML = wantTip;
        a.appendChild(tipEl);
      }
      var defEl = a.querySelector(".cascade-default");
      var isDefault = (row.branch || "") === defaultBranch;
      if (isDefault && !defEl) {
        defEl = document.createElement("span");
        defEl.className = "cascade-default";
        defEl.textContent = " · default";
        a.appendChild(defEl);
      } else if (!isDefault && defEl) {
        defEl.parentNode.removeChild(defEl);
      }
      a.setAttribute("title", rowTitle(row, row.build_seconds));
    }
    var timingEl = mount.querySelector(".cascade-timing");
    var t = timingText(timing, list.length);
    if (t) {
      if (!timingEl) {
        timingEl = document.createElement("div");
        timingEl.className = "cascade-timing";
        mount.appendChild(timingEl);
      }
      if (timingEl.textContent !== t) timingEl.textContent = t;
    } else if (timingEl) {
      timingEl.parentNode.removeChild(timingEl);
    }
    markActive(mount, cookieEdition());
    return true;
  }

  function renderTree(data, soft) {
    var mount = document.getElementById("cascade-tree");
    if (!mount) return;
    var list = (data && data.branches) || [];
    if (!list.length) {
      mount.textContent = "No branches in branch-status.json";
      return;
    }
    if (soft && mount.getAttribute("data-structure") === structureKey(list)) {
      if (updateValues(mount, data)) return;
    }
    var defaultBranch = (data && data.default_branch) || "feat/website-views";
    var timing = (data && data.rebuild_timing) || null;
    var html = [];
    html.push('<div class="cascade-tree-lines" role="group">');
    for (var i = 0; i < list.length; i++) {
      var row = list[i];
      var edition = row.edition || "";
      var branch = row.branch || "";
      var tip = row.tip || "";
      var prefix = row.prefix || "";
      var parent = row.parent || "";
      var tipTime = row.tip_time || "";
      var buildSec = row.build_seconds;
      var isDefault = branch === defaultBranch;
      var tipHtml = metaHtml(row);
      var label =
        esc(prefix) +
        "<code>" +
        esc(branch) +
        "</code>" +
        (tipHtml ? '<span class="tip"> ' + tipHtml + "</span>" : "") +
        (isDefault ? '<span class="cascade-default"> · default</span>' : "");
      html.push(
        '<a class="cascade-tree-row" role="treeitem" href="/_cascade/use/' +
          esc(edition) +
          '" data-edition="' +
          esc(edition) +
          '" data-branch="' +
          esc(branch) +
          '"' +
          (parent ? ' data-parent="' + esc(parent) + '"' : "") +
          (isDefault ? ' data-default="1"' : "") +
          ' title="' +
          esc(rowTitle(row, buildSec)) +
          '">' +
          label +
          "</a>"
      );
    }
    html.push("</div>");
    var t = timingText(timing, list.length);
    if (t) {
      html.push('<div class="cascade-timing">' + esc(t) + "</div>");
    }
    mount.innerHTML = html.join("");
    mount.setAttribute("data-structure", structureKey(list));
    markActive(mount, cookieEdition());
  }

  function loadStatus(soft) {
    var mount = document.getElementById("cascade-tree");
    return fetch("/branch-status.json", { cache: "no-store" })
      .then(function (res) {
        if (!res.ok) throw new Error("status");
        return res.json();
      })
      .then(function (data) {
        renderTree(data, !!soft);
      })
      .catch(function () {
        if (!soft && mount && !mount.querySelector("a[data-edition]")) {
          mount.innerHTML =
            '<a class="cascade-tree-row" href="/_cascade/use/flask" data-edition="flask" data-branch="flask"><code>flask</code></a>' +
            '<span class="tip"> (branch-status unavailable)</span>';
          markActive(mount, cookieEdition());
        }
      });
  }

  loadStatus(false);
  setInterval(function () {
    loadStatus(true);
  }, POLL_MS);
})();