// arr-tui for webOS: the shell with the views, the status of the services,
// the remote's hints and its buttons.

import { app } from "./app.ts";
import { applyTheme } from "./theme.ts";
import { h, replace } from "./ui/dom.ts";
import { current, focus, focusFirst, initFocus, Keys } from "./ui/focus.ts";
import { button, confirmDialog, toast } from "./ui/widgets.ts";
import { CalendarView } from "./views/calendar.ts";
import { DownloadsView, watchDownloads } from "./views/downloads.ts";
import { LibraryView } from "./views/library.ts";
import { LogView } from "./views/log.ts";
import { SearchView } from "./views/search.ts";
import { SettingsView } from "./views/settings.ts";
import type { Hint, View } from "./views/view.ts";

interface Entry {
  name: string;
  view: View;
  tab: HTMLButtonElement;
}

function start(): void {
  applyTheme(app.cfg.ui.theme);
  const content = h("main.content");
  const hints = h("div.footer-hints");
  const dots = h("div.status-dots");
  const tabs = h("nav.tabs.fgroup");
  const entries: Entry[] = [];
  let cur: Entry | null = null;
  let switchTimer = 0;

  const show = (e: Entry, focusView: boolean) => {
    if (cur === e) {
      if (focusView) focusFirst(e.view.el);
      return;
    }
    cur?.view.hide();
    cur?.tab.classList.remove("on");
    cur = e;
    e.tab.classList.add("on");
    replace(content, e.view.el);
    renderHints(e.view.hints);
    e.view.show();
    if (!focusView && current() !== e.tab) focus(e.tab);
  };

  const views: [string, View][] = [
    ["Movies", new SearchView("movie")],
    ["Series", new SearchView("series")],
    ["Library", new LibraryView()],
    ["Downloads", new DownloadsView()],
    ["Calendar", new CalendarView()],
    ["Settings", new SettingsView()],
    ["Log", new LogView()],
  ];
  views.forEach(([name, view], i) => {
    const tab = button(`${i + 1} ${name}`, () => show(entry, true), "tab");
    const entry: Entry = { name, view, tab };
    // Moving along the tabs switches views once the focus rests there.
    tab.addEventListener("focus", () => {
      clearTimeout(switchTimer);
      switchTimer = window.setTimeout(() => {
        if (document.activeElement === tab) show(entry, false);
      }, 250);
    });
    entries.push(entry);
    tabs.appendChild(tab);
  });

  function renderHints(list: Hint[]): void {
    replace(hints, ...list.map(([b, text]) => h("span.hint", h(`span.key.${b}` as "span", b === "ok" ? "OK" : b === "back" ? "Back" : ""), text)),
      h("span.hint", h("span.key.back", "Back"), "back"));
  }

  function renderDots(): void {
    replace(dots, ...(["Radarr", "Sonarr", "SABnzbd", "Trakt"] as const).map((name) => {
      const configured = name === "Radarr" ? app.radarr.configured() : name === "Sonarr" ? app.sonarr.configured()
        : name === "SABnzbd" ? app.sab.configured() : app.trakt.configured();
      const err = app.status[name];
      return h(`span.status-dot.${!configured ? "off" : err ? "bad" : "ok"}` as "span", { title: err || name }, name);
    }));
  }
  app.onStatus.push(renderDots);
  app.onConfig.push(renderDots);
  renderDots();

  const root = h("div.app",
    h("header.topbar", h("div.brand", "arr-tui"), tabs, dots),
    content,
    h("footer.footer", hints),
  );
  document.getElementById("root")!.appendChild(root);

  // Back: from a view to its tab; on the tabs, ask before leaving the app.
  const back = () => {
    const el = current();
    if (cur && el && !tabs.contains(el)) {
      focus(cur.tab);
      return;
    }
    confirmDialog("Leave arr-tui?", "Leave", () => window.close());
  };

  const keys = (ev: KeyboardEvent): boolean => {
    // 1-7 open a view.
    const n = ev.keyCode >= 49 && ev.keyCode <= 57 ? ev.keyCode - 49 : ev.keyCode >= 97 && ev.keyCode <= 105 ? ev.keyCode - 97 : -1;
    if (n >= 0 && n < entries.length) {
      show(entries[n], true);
      return true;
    }
    // Desktop browsers: F1-F4 stand in for the colour buttons.
    const code = ({ 112: Keys.red, 113: Keys.green, 114: Keys.yellow, 115: Keys.blue } as Record<number, number>)[ev.keyCode] ?? ev.keyCode;
    return !!cur?.view.keys?.(code);
  };
  initFocus(root, back, keys);

  const first = app.radarr.configured() || app.sonarr.configured() || app.sab.configured() ? 0 : 5; // nothing set up: Settings
  show(entries[first], false);
  watchDownloads();
  if (first === 5) toast("Nothing is configured yet: enter the addresses and API keys of your services.", "warn");

  // Check the services once at start, for the status dots.
  for (const [name, check] of [
    ["Radarr", () => app.radarr.systemStatus()],
    ["Sonarr", () => app.sonarr.systemStatus()],
    ["SABnzbd", () => app.sab.version()],
  ] as const) {
    const configured = name === "Radarr" ? app.radarr.configured() : name === "Sonarr" ? app.sonarr.configured() : app.sab.configured();
    if (configured) check().then(() => app.setStatus(name, null), (e) => app.setStatus(name, e));
  }
}

if (document.readyState === "loading") document.addEventListener("DOMContentLoaded", start);
else start();