// Unreal Engine Tools — official plugin.
// The core app keeps the build engine (UnrealBuildTool / MSBuild), the build
// overlay and the log reader; this plugin is just the Unreal-facing surface.
// It renders natively: the actions sit in the working-folder right-click menu
// with the host's Unreal + hammer icons, and the log is a bottom-dock tab —
// exactly where these lived before, just delivered as a plugin. Reached through
// the permission-gated `host.ue` bridge.

export function activate(host) {
  const ue = host.ue;
  if (!ue) { host.log("no ue bridge — plugin.json needs the \"ue\" permission"); return; }

  // Right-click the working folder → Launch / Build, shown only on a UE project.
  // Prefer the native folder-context slot (host ≥ 0.3.7); fall back to the top
  // menu on older hosts so the actions are always reachable.
  const addAction = (label, run, icon) => {
    if (host.ui.addFolderContextItem) host.ui.addFolderContextItem(label, run, { icon, visible: () => ue.hasProject() });
    else host.ui.addMenuItem(label, () => { if (!ue.hasProject()) { host.flash("No Unreal project in the current working folder.", true); return; } run(); }, { icon });
  };
  addAction("Launch Unreal Engine", () => ue.launch(), "ue");
  addAction("Build Solution (.sln)", () => ue.build(), "hammer");

  // Bottom-dock "Unreal" tab — tails the editor log (Saved/Logs), refreshing live.
  // Native dock panel on host ≥ 0.3.7; a modal view as a fallback on older hosts.
  const mountLog = (el) => {
      el.style.cssText = "display:flex;flex-direction:column;height:100%";
      const pre = document.createElement("pre");
      pre.style.cssText =
        "flex:1;margin:0;padding:10px 14px;overflow:auto;white-space:pre-wrap;word-break:break-word;" +
        "font:11.5px/1.6 var(--mono,ui-monospace,monospace);color:var(--muted,#9a9aa8)";
      el.appendChild(pre);
      let alive = true;
      async function tick() {
        if (!alive) return;
        try {
          if (!ue.hasProject()) { pre.textContent = "No Unreal project in the current working folder."; return; }
          const atBottom = pre.scrollTop + pre.clientHeight >= pre.scrollHeight - 30;
          const txt = await ue.readLog(200000);
          pre.textContent = txt || "No Unreal log yet. It shows here when the editor writes to Saved/Logs — i.e. while Unreal is running.";
          if (atBottom) pre.scrollTop = pre.scrollHeight;
        } catch (e) { pre.textContent = String(e); }
      }
      tick();
      const id = setInterval(tick, 1500);
      return () => { alive = false; clearInterval(id); };
  };
  if (host.ui.addDockPanel) host.ui.addDockPanel({ id: "unreal", title: "Unreal", icon: "ue", render: mountLog });
  else host.ui.addView({ id: "unreal-log", title: "Unreal Log", render: mountLog });

  host.log("Unreal Engine Tools activated");
}