// Maroochydore sea temperature widget, for Scriptable (https://scriptable.app). Paste this into a new Scriptable script
// and choose it for a widget: it downloads the widget's code from the site each time it runs, so the widget updates
// itself. Instructions: https://maroochydore.seatemp.eliza.house/iphone
//
// It keeps the last copy of the code that ran without an error, and runs that when the site can't be reached, or when
// a new copy fails (a broken deploy then leaves the previous version on the widget instead of an error).
// Lives in dom/sea_temp as widget/loader.js.

const CODE = "https://maroochydore.seatemp.eliza.house/seatemp-widget.js";
const fm = FileManager.local();
const saved = fm.joinPath(fm.documentsDirectory(), `seatemp-widget-code-${CODE.split("/")[2]}.js`);   // one per place
const AsyncFunction = Object.getPrototypeOf(async function () {}).constructor;

async function download() {
  try {
    const req = new Request(CODE);
    req.timeoutInterval = 15;
    const text = await req.loadString();
    // Only something that is the widget: an error or login page must never replace a working copy.
    return req.response.statusCode === 200 && text.startsWith("// SEATEMP-WIDGET") ? text : null;
  } catch (e) {
    return null;
  }
}

async function main() {
  const fresh = await download();
  let failure = null;
  if (fresh) {
    try {
      await new AsyncFunction(fresh)();
      fm.writeString(saved, fresh);
      return;
    } catch (e) {
      failure = e;
    }
  }
  if (fm.fileExists(saved)) {
    await new AsyncFunction(fm.readString(saved))();
    return;
  }
  const w = new ListWidget();
  w.addText("Sea temperature").font = Font.semiboldSystemFont(13);
  w.addText(failure ? `The widget failed: ${failure.message}` : "Couldn't download the widget yet: check the connection.").font = Font.systemFont(11);
  if (config.runsInWidget) Script.setWidget(w);
  else await w.presentSmall();
  Script.complete();
}

await main();