// The fullscreen page (registered as the /punktfunk route) — Hosts / Settings / About tabs.
import {
  ConfirmModal,
  DialogButton,
  Field,
  Focusable,
  ModalRoot,
  Navigation,
  Spinner,
  Tabs,
  showModal,
  staticClasses,
} from "@decky/ui";
import { RowActions, actionButton, iconButton } from "./ui";
import { toaster } from "@decky/api";
import { CSSProperties, FC, useState } from "react";
import {
  FaArrowLeft,
  FaDownload,
  FaExternalLinkAlt,
  FaInfoCircle,
  FaLock,
  FaLockOpen,
  FaPen,
  FaPlay,
  FaPlus,
  FaSyncAlt,
  FaThLarge,
  FaTrashAlt,
} from "react-icons/fa";
import { UpdateInfo, forgetHost, killStream } from "./backend";
import { PluginErrorBoundary } from "./boundary";
import {
  DOCS_URL,
  HostView,
  PinsApi,
  applyUpdate,
  checkForUpdatesNow,
  hasUpdate,
  mergeHosts,
  needsPair,
  pinIsOnline,
  resetAll,
  startStream,
  toHost,
  useHosts,
  usePins,
  useSavedHosts,
  useUpdate,
} from "./hooks";
import { AddHostModal, EditHostModal, mutationError } from "./hostmgmt";
import { GamePickerModal, storeLabel, streamPin } from "./library";
import { PairModal } from "./pair";
import { SettingsSection } from "./settings";
import { stopStream } from "./steam";

export const ROUTE = "/punktfunk";

// Bottom inset so the last control clears Gaming Mode's footer hint bar. Routed pages render
// *under* that bar otherwise — that's why the last Stream-settings row was getting hidden. The
// value is generous on purpose (and harmless where the tab area already insets); tune to taste.
const SAFE_BOTTOM = "80px";

// Each tab is its own scroll area so long content is always reachable above the footer.
const tabScroll: CSSProperties = {
  height: "100%",
  overflowY: "auto",
  padding: "0.5em 2.5em",
  paddingBottom: SAFE_BOTTOM,
  boxSizing: "border-box",
};

// The one-line status under a host name: address, live presence, and trust state.
function hostSubtitle(v: HostView): string {
  const parts = [`${v.addr}:${v.port}`, v.online ? "online" : "offline"];
  if (needsPair(v)) {
    parts.push("pairing required");
  } else if (v.paired) {
    parts.push("paired");
  } else if (v.saved) {
    parts.push("trusted");
  }
  return parts.join(" · ");
}

/** Confirm + forget a saved host, then refresh the list. */
function confirmForget(v: HostView, refresh: () => void): void {
  const selector = v.fp || `${v.addr}:${v.port}`;
  showModal(
    <ConfirmModal
      strTitle={`Forget ${v.name}?`}
      strDescription="You'll need to pair or trust it again to reconnect."
      strOKButtonText="Forget"
      bDestructiveWarning
      onOK={async () => {
        const r = await forgetHost(selector);
        toaster.toast({
          title: "Punktfunk",
          body: r.ok ? `Forgot ${v.name}` : mutationError(r),
        });
        refresh();
      }}
    />,
  );
}

// ----------------------------------------------------------------------------------------
// Host details — everything we know, plus (for a saved host) rename / edit / forget.
// ----------------------------------------------------------------------------------------
const HostDetailsModal: FC<{
  host: HostView;
  onChanged: () => void;
  closeModal?: () => void;
}> = ({ host, onChanged, closeModal }) => {
  const fp = host.fp ? (host.fp.match(/.{1,4}/g) ?? [host.fp]).join(" ") : "not known yet";
  return (
    <ModalRoot closeModal={closeModal}>
      <div style={{ fontWeight: "bold", fontSize: "1.3em", marginBottom: "0.4em" }}>
        {host.name}
      </div>
      <Field focusable={false} label="Address">
        {host.addr}:{host.port}
      </Field>
      <Field focusable={false} label="Presence">
        {host.online ? "Online" : "Offline"}
      </Field>
      <Field focusable={false} label="This Deck">
        {host.paired ? "Paired" : host.fp ? "Trusted" : "Not paired yet"}
      </Field>
      <Field
        focusable={false}
        label="Certificate fingerprint (SHA-256)"
        description={
          <span
            style={{ fontFamily: "monospace", fontSize: "0.85em", wordBreak: "break-word" }}
          >
            {fp}
          </span>
        }
      />
      {host.saved && (
        <Field label="Manage" childrenContainerWidth="max">
          <RowActions>
            <DialogButton
              style={actionButton}
              onClick={() => {
                closeModal?.();
                showModal(<EditHostModal host={host} onDone={onChanged} />);
              }}
            >
              <FaPen style={{ marginRight: "0.4em" }} />
              Edit
            </DialogButton>
            <DialogButton
              style={actionButton}
              onClick={() => {
                closeModal?.();
                confirmForget(host, onChanged);
              }}
            >
              <FaTrashAlt style={{ marginRight: "0.4em" }} />
              Forget
            </DialogButton>
          </RowActions>
        </Field>
      )}
    </ModalRoot>
  );
};

// ----------------------------------------------------------------------------------------
// One host row: status icon + address, details / pair / stream actions.
// ----------------------------------------------------------------------------------------
const HostRow: FC<{
  host: HostView;
  onChanged: () => void;
  onGames: () => void;
}> = ({ host, onChanged, onGames }) => {
  const pair = needsPair(host);
  const h = toHost(host);
  return (
    <Field
      label={
        <span style={{ display: "inline-flex", alignItems: "center", gap: "0.4em" }}>
          {pair ? <FaLock /> : <FaLockOpen />}
          {host.name}
        </span>
      }
      description={hostSubtitle(host)}
      childrenContainerWidth="max"
    >
      <RowActions>
        <DialogButton
          style={iconButton}
          onClick={() => showModal(<HostDetailsModal host={host} onChanged={onChanged} />)}
        >
          <FaInfoCircle />
        </DialogButton>
        {/* Labeled, not icon-only: this is the entry to the game picker AND the on-screen
            library browser, and controller nav has no hover tooltip to explain a bare icon. */}
        <DialogButton style={actionButton} onClick={onGames}>
          <FaThLarge style={{ marginRight: "0.4em" }} />
          Games
        </DialogButton>
        {pair && (
          <DialogButton
            style={actionButton}
            onClick={() => showModal(<PairModal host={h} onPaired={onChanged} />)}
          >
            Pair
          </DialogButton>
        )}
        <DialogButton
          style={actionButton}
          onClick={() =>
            pair
              ? showModal(<PairModal host={h} onPaired={() => startStream(h)} />)
              : startStream(h)
          }
        >
          <FaPlay style={{ marginRight: "0.4em" }} />
          Stream
        </DialogButton>
      </RowActions>
    </Field>
  );
};

const HostsTab: FC<{
  hosts: HostView[];
  scanning: boolean;
  refresh: () => void;
  pins: PinsApi;
  clientUpdatePending: boolean;
}> = ({ hosts, scanning, refresh, pins, clientUpdatePending }) => (
  <div style={tabScroll}>
    <Field
      label="Hosts"
      description={
        scanning
          ? "Scanning the LAN…"
          : `${hosts.length} host${hosts.length === 1 ? "" : "s"} — saved and on your network`
      }
      childrenContainerWidth="max"
      bottomSeparator={hosts.length ? "standard" : "none"}
    >
      <RowActions>
        <DialogButton
          style={actionButton}
          onClick={() => showModal(<AddHostModal onDone={refresh} />)}
        >
          <FaPlus style={{ marginRight: "0.5em" }} />
          Add
        </DialogButton>
        <DialogButton style={actionButton} disabled={scanning} onClick={refresh}>
          {scanning ? (
            <Spinner style={{ height: "1em", marginRight: "0.5em" }} />
          ) : (
            <FaSyncAlt style={{ marginRight: "0.5em" }} />
          )}
          {scanning ? "Scanning…" : "Refresh"}
        </DialogButton>
      </RowActions>
    </Field>

    {hosts.length === 0 && !scanning && (
      <Field
        focusable={false}
        label="No hosts yet"
        description="Add one by address with +, or start a Punktfunk host on this network and refresh. The setup guide (About tab) covers installing a host."
      />
    )}
    {hosts.map((h) => (
      <HostRow
        key={h.fp || `${h.addr}:${h.port}`}
        host={h}
        onChanged={refresh}
        onGames={() =>
          showModal(
            <GamePickerModal
              host={toHost(h)}
              pins={pins}
              clientUpdatePending={clientUpdatePending}
            />,
          )
        }
      />
    ))}

    {/* Pinned games — also the cleanup surface for pins whose host is gone from the scan. */}
    {pins.pins.length > 0 && (
      <>
        <Field
          focusable={false}
          label="Pinned games"
          description="One-tap streams — they also live in the quick-access menu"
          bottomSeparator="standard"
        />
        {pins.pins.map((pin) => {
          const online = pinIsOnline(pin, hosts);
          return (
            <Field
              key={`${pin.host_fp}:${pin.game_id}`}
              label={pin.title}
              description={`${storeLabel(pin.store)} · ${pin.host_name}${
                online ? "" : " · offline?"
              }${pin.paired ? "" : " · pairing required"}`}
              childrenContainerWidth="max"
            >
              <RowActions>
                <DialogButton
                  style={actionButton}
                  onClick={() => streamPin(pin, hosts.map(toHost), pins)}
                >
                  <FaPlay style={{ marginRight: "0.4em" }} />
                  Play
                </DialogButton>
                <DialogButton
                  style={actionButton}
                  onClick={() => pins.removePin(pin.host_fp, pin.game_id)}
                >
                  Remove
                </DialogButton>
              </RowActions>
            </Field>
          );
        })}
      </>
    )}
  </div>
);

const SettingsTab: FC = () => (
  <div style={tabScroll}>
    <SettingsSection />
  </div>
);

// ----------------------------------------------------------------------------------------
// About — plugin version + explicit update check, docs link, stream-exit help, force-stop,
// and the destructive "reset everything" action.
// ----------------------------------------------------------------------------------------
async function forceStopStream(): Promise<void> {
  stopStream(); // ask Steam to end the "game" first (clean path)
  const res = await killStream(); // then the flatpak-level hammer for a wedged client
  toaster.toast({
    title: "Punktfunk",
    body: res.ok ? "Stream client stopped." : "Couldn’t stop the stream client.",
  });
}

function confirmReset(refreshers: Array<() => void | Promise<void>>): void {
  showModal(
    <ConfirmModal
      strTitle="Reset Punktfunk?"
      strDescription="Clears every saved host, your stream settings, and all pinned games on this Deck. Your client identity is kept, so you'll re-pair hosts to reconnect. This can't be undone."
      strOKButtonText="Reset"
      bDestructiveWarning
      onOK={() => void resetAll(refreshers)}
    />,
  );
}

const AboutTab: FC<{
  update: UpdateInfo | null;
  checking: boolean;
  check: (force: boolean) => Promise<UpdateInfo | null>;
  onReset: () => void;
}> = ({ update, checking, check, onReset }) => (
  <div style={tabScroll}>
    <Field
      label="Version"
      description={
        update
          ? `v${update.current}${
              update.channel ? ` · ${update.channel} channel` : " · development build"
            }`
          : "…"
      }
      childrenContainerWidth="max"
    >
      <RowActions>
        <DialogButton
          style={actionButton}
          disabled={checking}
          onClick={() => void checkForUpdatesNow(check)}
        >
          {checking ? <Spinner style={{ height: "1em" }} /> : "Check for updates"}
        </DialogButton>
      </RowActions>
    </Field>
    {hasUpdate(update) && (
      <Field
        label={
          update!.update_available
            ? `Plugin update — v${update!.latest}${
                update!.client_update_available ? " + client" : ""
              }`
            : "Client update available"
        }
        description="Installing can take a couple of minutes; Decky reloads the plugin when done"
        childrenContainerWidth="max"
      >
        <RowActions>
          <DialogButton style={actionButton} onClick={() => applyUpdate(update!, check)}>
            <FaDownload style={{ marginRight: "0.4em" }} />
            Update
          </DialogButton>
        </RowActions>
      </Field>
    )}
    <Field
      label="Setup guide"
      description="Hosts, pairing, controllers, and troubleshooting — docs.punktfunk.unom.io"
      childrenContainerWidth="max"
    >
      <RowActions>
        <DialogButton
          style={actionButton}
          onClick={() => Navigation.NavigateToExternalWeb(DOCS_URL)}
        >
          <FaExternalLinkAlt style={{ marginRight: "0.4em" }} />
          Open
        </DialogButton>
      </RowActions>
    </Field>
    <Field
      focusable={false}
      label="Leaving a stream"
      description="Hold L1 + R1 + Start + Select inside the stream, or close the “game” from the Steam overlay — either returns you to Gaming Mode."
    />
    <Field
      label="Stream stuck?"
      description="Force-stop the stream client if a session wedges"
      childrenContainerWidth="max"
    >
      <RowActions>
        <DialogButton style={actionButton} onClick={() => void forceStopStream()}>
          Force-stop
        </DialogButton>
      </RowActions>
    </Field>
    <Field
      label="Reset Punktfunk"
      description="Clear saved hosts, stream settings, and pinned games on this Deck (keeps your client identity)"
      childrenContainerWidth="max"
    >
      <RowActions>
        <DialogButton style={actionButton} onClick={onReset}>
          <FaTrashAlt style={{ marginRight: "0.4em" }} />
          Reset
        </DialogButton>
      </RowActions>
    </Field>
  </div>
);

const PunktfunkPage: FC = () => {
  const { hosts: discovered, scanning, refresh: refreshDiscovered } = useHosts();
  const { saved, loading: loadingSaved, refresh: refreshSaved } = useSavedHosts();
  const { info: update, checking, check } = useUpdate();
  const pins = usePins();
  const [tab, setTab] = useState("hosts");

  const hosts = mergeHosts(saved, discovered);
  // A host action (pair/add/edit/forget) can change either store, so refresh both.
  const refreshHosts = () => {
    void refreshDiscovered();
    void refreshSaved();
  };

  return (
    <div
      style={{
        marginTop: "40px",
        height: "calc(100% - 40px)",
        display: "flex",
        flexDirection: "column",
      }}
    >
      {/* Header is title + back only — updates live on the About tab (and the QAM banner). */}
      <Focusable
        style={{
          display: "flex",
          alignItems: "center",
          gap: "1em",
          padding: "0 2.5em",
          marginBottom: "0.4em",
          flexShrink: 0,
        }}
      >
        <DialogButton style={iconButton} onClick={() => Navigation.NavigateBack()}>
          <FaArrowLeft />
        </DialogButton>
        <div className={staticClasses?.Title} style={{ flex: 1, margin: 0 }}>
          Punktfunk
        </div>
      </Focusable>

      {/* Two things fight each other on an L1/R1 tab switch:
          1. Valve's Tabs slides the incoming panel in from the right with a CSS transform.
          2. `autoFocusContents` then focuses a control inside that still-offscreen panel, which
             fires scrollIntoView. Because the panel is offset by a *transform* (not by scroll
             position), scrollIntoView can't satisfy it by scrolling any one ancestor, so it walks
             up and pans the whole page — the "screen jumps right, then animates back" glitch.
          Dropping autoFocusContents removes the scrollIntoView entirely, so nothing fights the
          slide. L1/R1 still cycles tabs (that handler lives on the Tabs focus scope, active while
          focus is anywhere inside — including the tab strip); after a switch, focus stays on the
          strip and Down enters the content, which is how Steam's own tabbed pages behave.
          The overflow:hidden clip stays as defense-in-depth against any stray horizontal pan. */}
      <div style={{ flex: 1, minHeight: 0, overflow: "hidden" }}>
        <Tabs
          activeTab={tab}
          onShowTab={(id: string) => setTab(id)}
          tabs={[
            {
              id: "hosts",
              title: "Hosts",
              content: (
                <HostsTab
                  hosts={hosts}
                  scanning={scanning || loadingSaved}
                  refresh={refreshHosts}
                  pins={pins}
                  clientUpdatePending={!!update?.client_update_available}
                />
              ),
            },
            {
              id: "settings",
              title: "Settings",
              content: <SettingsTab />,
            },
            {
              id: "about",
              title: "About",
              content: (
                <AboutTab
                  update={update}
                  checking={checking}
                  check={check}
                  onReset={() => confirmReset([refreshHosts, pins.refresh])}
                />
              ),
            },
          ]}
        />
      </div>
    </div>
  );
};

// Full page behind the boundary — registered as the /punktfunk route.
export const PunktfunkRoute: FC = () => (
  <PluginErrorBoundary>
    <PunktfunkPage />
  </PluginErrorBoundary>
);