#pragma once
#include <helpers/ui/DisplayDriver.h>
#include <helpers/ui/UIScreen.h>
#include <Arduino.h>
#include <math.h>
#include "icons.h"
#include "InfoKit.h"
#include "PopupMenu.h"
#include "TabBar.h"
#include "../MyMesh.h"
#include "../ui-core/SiteQr.h"
#include "../ui-core/ContactQr.h"
#include "../ui-core/Diagnostics.h"
#include "../ui-core/Battery.h"
#if ENV_INCLUDE_GPS == 1 && defined(GPS_SKYVIEW)
  #include "SkyView.h"
  #define STATUS_HAS_SKY 1
#elif ENV_INCLUDE_GPS == 1
  #include <helpers/sensors/GpsSky.h>   // the type only: no receiver data without GPS_SKYVIEW
#endif

extern MyMesh the_mesh;

// Home › Status (Enter on the Status page): what the device can tell about
// itself, one tab per subject. LEFT/RIGHT switches tabs, UP/DOWN scrolls a
// tab by whole blocks.
//   Radio  -- frequency, SF / BW / CR, TX power, the noise floor with its
//             last half hour, the last packet's signal.
//   GPS    -- on / off (Enter toggles), fix, satellites, position, altitude,
//             speed, precision, time to first fix.
//   Sky    -- the sky plot or the signal bars (SkyView.h); Enter swaps them.
//   Power  -- battery level, voltage, source, its trend, then any sensors.
//   Mesh   -- packet counts with a traffic line, nodes heard, contacts.
//             Hold Enter resets the counters.
//   System -- uptime, firmware, device, memory, queue, errors, a font card.
//             Enter shows the QR code of the Solo site; any key closes it.
// Replaces Tools › Diagnostics and Tools › Satellites. Drawn with InfoKit.h.
class StatusScreen : public UIScreen {
public:
  enum Tab : uint8_t { TAB_RADIO, TAB_GPS, TAB_SKY, TAB_POWER, TAB_MESH, TAB_SYSTEM, TAB_ALL };

private:
  UITask* _task;
  uint8_t _tabs[TAB_ALL];          // the tabs this board has, in order
  const char* _labels[TAB_ALL];
  uint8_t _count = 0;
  uint8_t _cur = 0;                // index into _tabs
  int  _scroll = 0;                // blocks scrolled off the top
  bool _more = false;              // the last frame cut blocks off at the bottom
  bool _signal = false;            // Sky: the bars instead of the plot
  // System: a QR code full screen -- your contact, then (Enter) the manual.
  enum : uint8_t { QR_NONE, QR_CONTACT, QR_MANUAL };
  uint8_t _qr = QR_NONE;
  contactqr::Code _contact_qr;
  PopupMenu _reset_menu;           // Mesh, Hold Enter -> confirm
  CayenneLPP _lpp;
  unsigned long _lpp_at = 0;

  // History lines (ui-core/StatusHistory.h), one sample a minute (32 min).
  // E-ink draws them as charts (chartBlock()) over a longer span: a sample
  // every 5 minutes, 8 hours. Its Radio chart also has the SNR of the last
  // 32 packets.
public:
  static const int HIST_N = Features::IS_EINK ? 96 : 32;
private:
  static constexpr const char* HIST_SPAN = Features::IS_EINK ? "8 h ago" : "32 min";
  uicore::StatusHistory<HIST_N, Features::IS_EINK ? 300000UL : 60000UL> _hist;

  // A chart as a block (e-ink): `title` with the value now on its line, the
  // chart under it.
  template <int N>
  void chartBlock(DisplayDriver& d, info::Flow& f, int rsv, const char* title, const char* now,
                  const info::History<N>& hs, int min_span, bool bars, const char* span,
                  info::ChartAxisFmt axis) {
    const int lh = d.getLineHeight(), ch = 3 * lh;
    if (!f.place(d.lineStep() + info::chartH(d, ch) + 2)) return;
    info::valueRow(d, f.at, title, now, false, rsv, 1);
    info::chart(d, 1, f.at + d.lineStep(), d.width() - rsv - 3, ch, hs, min_span, bars, span, "now", axis);
  }

  void addTab(uint8_t t, const char* label) { _tabs[_count] = t; _labels[_count] = label; _count++; }
  uint8_t tab() const { return _tabs[_cur]; }

public:
  static uint32_t totalRx() {
    uint32_t n = 0;
    for (uint8_t t = 0; t < 16; t++) n += the_mesh.getNumRecvByType(t);
    return n;
  }
  static uint32_t totalTx() {
    uint32_t n = 0;
    for (uint8_t t = 0; t < 16; t++) n += the_mesh.getNumSentByType(t);
    return n;
  }
private:

  int battMv() const { return _task->getBattMilliVolts(); }
  int battPct() const {
    NodePrefs* p = the_mesh.getNodePrefs();
    return battery::percent(battMv(), p ? (int)p->low_batt_mv : 0);
  }
  bool imperial() const {
    NodePrefs* p = the_mesh.getNodePrefs();
    return p && p->units_imperial;
  }

  // One label/value row as a block.
  // A long value takes the line under its label (no cursor here to scroll it).
  void row(DisplayDriver& d, info::Flow& f, int reserve, const char* label, const char* value) {
    if (f.place(info::rowH(d, label, value, reserve))) info::rowWrapped(d, f.at, label, value, reserve);
  }
  void section(DisplayDriver& d, info::Flow& f, int reserve, const char* label) {
    if (f.place(d.lineStep())) info::section(d, f.at, label, reserve);
  }

  // ── tabs ──────────────────────────────────────────────────────────────
  void tabRadio(DisplayDriver& d, info::Flow& f, int rsv) {
    NodePrefs* p = the_mesh.getNodePrefs();
    char a[24], b[24];
    const int lh = d.getLineHeight();
    if (f.place(info::bigH(d) + 2)) {
      snprintf(a, sizeof(a), "%.3f", p ? p->freq : 0.0f);
      info::big(d, 1, f.at, a, "MHz");
    }
    if (f.place(lh + 5)) {
      int x = 1;
      snprintf(a, sizeof(a), "SF%u", p ? (unsigned)p->sf : 0);      x = info::chip(d, x, f.at, a);
      snprintf(a, sizeof(a), "BW%g", p ? p->bw : 0.0f);              x = info::chip(d, x, f.at, a);
      snprintf(a, sizeof(a), "CR%u", p ? (unsigned)p->cr : 0);       info::chip(d, x, f.at, a);
    }
    snprintf(a, sizeof(a), "%d dBm", (int)radio_driver.getTxPower());
    row(d, f, rsv, "TX power", a);
    const int nf = (int)radio_driver.getNoiseFloor();
    if (nf) snprintf(a, sizeof(a), "%d dBm", nf); else strcpy(a, "-");
    if (Features::IS_EINK) {
      chartBlock(d, f, rsv, "Noise", a, _hist.noise, 6, false, HIST_SPAN, info::axisPlain);
    } else if (f.place(d.lineStep())) {   // label, the last half hour, the value now
      info::valueRow(d, f.at, "Noise", a, false, rsv, 1);
      const int x0 = 1 + d.getTextWidth("Noise") + 6;
      const int x1 = d.width() - rsv - 2 - d.getTextWidth(a) - 6;
      if (x1 - x0 > 12) info::spark(d, x0, f.at, x1 - x0, lh - 1, _hist.noise);
    }
    if (f.place(d.lineStep())) {
      const float snr = radio_driver.getLastSNR();
      snprintf(b, sizeof(b), "%d dBm", (int)radio_driver.getLastRSSI());
      info::valueRow(d, f.at, "Last RX", b, false, rsv, 1);
      drawSignalBars(d, d.width() - rsv - 2 - d.getTextWidth(b) - 5, f.at, (int)(snr * 4));
    }
    snprintf(b, sizeof(b), "%.1f dB", radio_driver.getLastSNR());
    if (Features::IS_EINK) chartBlock(d, f, rsv, "SNR", b, _hist.snr, 20, false, "32 pkts", info::axisQuarterDb);
    else row(d, f, rsv, "Last SNR", b);
  }

#if ENV_INCLUDE_GPS == 1
  void tabGps(DisplayDriver& d, info::Flow& f, int rsv) {
    char a[24];
    const int lh = d.getLineHeight();
    const bool on = _task->getGPSState();
    if (f.place(d.lineStep())) {
      info::valueRow(d, f.at, "GPS", nullptr, false, rsv, 1);
      info::toggle(d, d.width() - rsv - 2, f.at, on);
    }
    LocationProvider* loc = sensors.getLocationProvider();
#ifdef STATUS_HAS_SKY
    GpsSky* g = skyview::sky();
#else
    GpsSky* g = nullptr;
#endif
    if (!loc) { row(d, f, rsv, "Receiver", "none"); return; }
    const bool fix = loc->isValid();
    const bool sleeping = sensors.isGpsDutySleeping();
    if (f.place(lh + 5)) {   // the fix as a chip, satellites used / in view
      const char* st = !on ? "OFF" : sleeping ? "SLEEP" : !fix ? "NO FIX" : (g && g->fix_mode == 2) ? "2D FIX" : "3D FIX";
      info::chip(d, 1, f.at, st, on && fix);
#ifdef STATUS_HAS_SKY
      if (g) snprintf(a, sizeof(a), "%d/%d sats", skyview::usedCount(*g), g->count);
      else
#endif
      snprintf(a, sizeof(a), "%ld sats", loc->satellitesCount());
      d.drawTextRightAlign(d.width() - rsv - 2, f.at + 1, a);
    }
    const long lat = fix ? loc->getLatitude() : lround(sensors.node_lat * 1000000.0);
    const long lon = fix ? loc->getLongitude() : lround(sensors.node_lon * 1000000.0);
    // The driver reports 999 deg before a first fix (0,0 in the simulator).
    const bool known = labs(lat) <= 90000000L && (lat || lon);
    if (known) snprintf(a, sizeof(a), "%.5f\xc2\xb0%c", labs(lat) / 1e6, lat < 0 ? 'S' : 'N'); else strcpy(a, "-");
    row(d, f, rsv, fix ? "Lat" : "Lat (last)", a);
    if (known) snprintf(a, sizeof(a), "%.5f\xc2\xb0%c", labs(lon) / 1e6, lon < 0 ? 'W' : 'E'); else strcpy(a, "-");
    row(d, f, rsv, fix ? "Lon" : "Lon (last)", a);
    if (fix || (sensors.node_lat != 0.0 || sensors.node_lon != 0.0)) {
      const double altitude = fix ? loc->getAltitude() / 1000.0 : sensors.node_altitude;
      telemetry::altText(altitude, imperial(), L1_INFO, a, sizeof(a));
      row(d, f, rsv, "Altitude", a);
    }
    if (g && fix) {
      if (imperial()) snprintf(a, sizeof(a), "%.0f mph", g->speed_kmh * 0.621371f);
      else            snprintf(a, sizeof(a), "%.0f km/h", g->speed_kmh);
      row(d, f, rsv, "Speed", a);
    }
    if (g) {
      if (g->hdop > 0 && g->hdop < 99) snprintf(a, sizeof(a), "%.1f", g->hdop); else strcpy(a, "-");
      row(d, f, rsv, "HDOP", a);
      if (g->ttff_ms)       snprintf(a, sizeof(a), "%lu s", (unsigned long)(g->ttff_ms / 1000));
      else if (on && g->start_ms) {
        const unsigned long s = (millis() - g->start_ms) / 1000;
        if (!Features::IS_EINK) snprintf(a, sizeof(a), "%lu s", s);
        else if (s < 60)        strcpy(a, "<1 min");   // seconds would refresh the panel every second
        else                    snprintf(a, sizeof(a), "%lu min", s / 60);
      }
      else                  strcpy(a, "-");
      row(d, f, rsv, g->ttff_ms ? "First fix" : "Searching", a);
    }
  }
#endif

  void tabPower(DisplayDriver& d, info::Flow& f, int rsv) {
    char a[24];
    const int mv = battMv(), pct = battPct();
    if (f.place(info::bigH(d) + 2)) {
      snprintf(a, sizeof(a), "%d", pct);
      const int w = info::big(d, 1, f.at, a, "%");
      const int mx = 1 + w + 8, mh = d.getLineHeight() + 2;
      info::meter(d, mx, f.at + info::bigH(d) - mh - 1, d.width() - rsv - 2 - mx, mh, pct / 100.0f);
    }
    snprintf(a, sizeof(a), "%d.%02d V", mv / 1000, (mv % 1000) / 10);
    row(d, f, rsv, "Battery", a);
    row(d, f, rsv, "Source", board.isExternalPowered() ? "USB" : "Battery");
    if (Features::IS_EINK) {
      chartBlock(d, f, rsv, "Trend", nullptr, _hist.batt, 20, false, HIST_SPAN, info::axisVolts);
    } else if (f.place(d.lineStep())) {
      d.setCursor(1, f.at);
      d.print("Trend");
      const int x0 = 1 + d.getTextWidth("Trend") + 6;
      info::spark(d, x0, f.at, d.width() - rsv - 2 - x0, d.getLineHeight() - 1, _hist.batt, 20);
    }

    // Sensors: every reading but the battery (above) and the position (GPS).
    if (!_lpp_at || millis() - _lpp_at > 5000) {   // both passes (measure, draw) read one query
      _lpp.reset();
      { CardKBBusLock bus_lock; sensors.querySensors(0xFF, _lpp); }   // shares the CardKB's bus
      _lpp_at = millis() | 1;
    }
    static const struct { uint8_t type; const char* name; } NAMES[] = {
      { LPP_TEMPERATURE, "Temperature" }, { LPP_RELATIVE_HUMIDITY, "Humidity" },
      { LPP_BAROMETRIC_PRESSURE, "Pressure" }, { LPP_ALTITUDE, "Altitude" },
      { LPP_CURRENT, "Current" }, { LPP_POWER, "Power" }, { LPP_LUMINOSITY, "Light" },
      { LPP_PERCENTAGE, "Moisture" }, { LPP_DISTANCE, "Distance" }, { LPP_CONCENTRATION, "CO2" },
    };
    bool titled = false;
    LPPReader r(_lpp.getBuffer(), _lpp.getSize());
    uint8_t ch, type;
    while (r.readHeader(ch, type)) {
      const char* name = nullptr;
      for (auto& n : NAMES) if (n.type == type) { name = n.name; break; }
      if (!name) { r.skipData(type); continue; }
      telemetry::lppText(r, type, imperial(), L1_INFO, a, sizeof(a));
      if (!titled) { section(d, f, rsv, "Sensors"); titled = true; }
      row(d, f, rsv, name, a);
    }
  }

  void tabMesh(DisplayDriver& d, info::Flow& f, int rsv) {
    char a[24];
    const int lh = d.getLineHeight();
    if (f.place(d.lineStep())) {
      snprintf(a, sizeof(a), "RX %lu", (unsigned long)totalRx());
      d.setCursor(1, f.at); d.print(a);
      snprintf(a, sizeof(a), "TX %lu", (unsigned long)totalTx());
      d.drawTextRightAlign(d.width() - rsv - 2, f.at, a);
    }
    if (Features::IS_EINK) {   // packets per 5 minutes, as bars
      const int ch = 3 * lh;
      if (f.place(info::chartH(d, ch) + 2))
        info::chart(d, 1, f.at, d.width() - rsv - 3, ch, _hist.traffic, 4, true, HIST_SPAN, "now", info::axisPlain);
    } else if (f.place(lh + 6)) {
      info::spark(d, 1, f.at, d.width() - rsv - 3, lh + 3, _hist.traffic, 4);
    }

    static const uint8_t MSG[]    = { PAYLOAD_TYPE_TXT_MSG, PAYLOAD_TYPE_GRP_TXT };
    static const uint8_t ADVERT[] = { PAYLOAD_TYPE_ADVERT };
    static const uint8_t ROUTE[]  = { PAYLOAD_TYPE_ACK, PAYLOAD_TYPE_PATH, PAYLOAD_TYPE_TRACE };
    snprintf(a, sizeof(a), "%lu / %lu", (unsigned long)diag::sumByTypes(true, MSG, 2), (unsigned long)diag::sumByTypes(false, MSG, 2));
    row(d, f, rsv, "Messages", a);
    snprintf(a, sizeof(a), "%lu / %lu", (unsigned long)diag::sumByTypes(true, ADVERT, 1), (unsigned long)diag::sumByTypes(false, ADVERT, 1));
    row(d, f, rsv, "Adverts", a);
    snprintf(a, sizeof(a), "%lu / %lu", (unsigned long)diag::sumByTypes(true, ROUTE, 3), (unsigned long)diag::sumByTypes(false, ROUTE, 3));
    row(d, f, rsv, "Acks, paths", a);
    snprintf(a, sizeof(a), "%lu", (unsigned long)the_mesh.getNumForwarded());
    row(d, f, rsv, "Forwarded", a);
    snprintf(a, sizeof(a), "%d", heardLastHour());
    row(d, f, rsv, "Heard in 1 h", a);
    snprintf(a, sizeof(a), "%d", the_mesh.getNumContacts());
    row(d, f, rsv, "Contacts", a);
  }

  void tabSystem(DisplayDriver& d, info::Flow& f, int rsv) {
    char a[32];
    uint32_t up = millis() / 1000;
    unsigned long dd = up / 86400, h = (up % 86400) / 3600, m = (up % 3600) / 60;
    if (dd) snprintf(a, sizeof(a), "%lud %luh %lum", dd, h, m);
    else    snprintf(a, sizeof(a), "%luh %lum", h, m);
    row(d, f, rsv, "Uptime", a);
    diag::shortVersion(a, sizeof(a));
    row(d, f, rsv, "Firmware", a);
    row(d, f, rsv, "Built", FIRMWARE_BUILD_DATE);
    row(d, f, rsv, "Device", board.getManufacturerName());
    row(d, f, rsv, "QR codes", "Enter: you, manual");
    uint32_t heap_free, heap_total;
    DeviceDiag::getHeapStats(heap_free, heap_total);
    if (heap_total) snprintf(a, sizeof(a), "%lu of %lu KB", (unsigned long)(heap_free / 1024), (unsigned long)(heap_total / 1024));
    else            strcpy(a, "-");
    row(d, f, rsv, "Free heap", a);
    snprintf(a, sizeof(a), "%lu B", (unsigned long)DeviceDiag::getStackFreeBytes());
    row(d, f, rsv, "Free stack", a);
    snprintf(a, sizeof(a), "%d", the_mesh.getPoolFreeCount());
    row(d, f, rsv, "Packet pool", a);
    snprintf(a, sizeof(a), "%d", the_mesh.getOutboundQueueLen());
    row(d, f, rsv, "Send queue", a);
    const uint16_t err = the_mesh.getErrFlags();
    if (!err) strcpy(a, "none");
    else snprintf(a, sizeof(a), "%s%s%s", (err & ERR_EVENT_FULL) ? "full " : "",
                  (err & ERR_EVENT_CAD_TIMEOUT) ? "CAD " : "", (err & ERR_EVENT_STARTRX_TIMEOUT) ? "RX" : "");
    row(d, f, rsv, "Errors", a);
    section(d, f, rsv, "Font");
    diag::Line lines[diag::MAX_LINES];
    const int n = diag::fontLines(lines);
    for (int i = 0; i < n; i++)
      if (f.place(d.lineStep())) d.drawTextEllipsized(1, f.at, d.width() - rsv - 3, lines[i]);
  }

  // A QR code as large as the screen allows, dark modules on light (LIGHT is
  // the ink on e-ink, the lit pixel elsewhere), with its caption beside it or
  // under it: your contact, or the site's manual.
  void renderQr(DisplayDriver& d) {
    static const char* const MANUAL[] = { "Solo manual", siteqr::URL, nullptr };
    static const char* const MANUAL_NARROW[] = { "Scan for", "the Solo", "manual" };
    if (_qr == QR_CONTACT && _contact_qr.n) {
      const char* const you[] = { "Scan to add", the_mesh.getNodeName(), nullptr };
      renderQr(d, _contact_qr.n, [&](int x, int y) { return _contact_qr.dark(x, y); }, you, you);
    } else {
      renderQr(d, siteqr::N, siteqr::dark, MANUAL, MANUAL_NARROW);
    }
  }
  // Caption: up to three lines, `wide` when every line fits beside / under
  // the code, else `narrow` (lines cut to fit).
  template <class Dark>
  void renderQr(DisplayDriver& d, int n, Dark dark, const char* const* wide, const char* const* narrow) {
    const int W = d.width(), H = d.height(), lh = d.getLineHeight();
    const bool tall = H > W;
    const int side = n + 2 * siteqr::QUIET;
    const int s = (tall ? W : H) / side > 0 ? (tall ? W : H) / side : 1;
    const int px = side * s;
    const int tx = tall ? 0 : px + 2, tw = W - tx;
    const char* const* cap = wide;
    for (int i = 0; i < 3 && wide[i]; i++) if (d.getTextWidth(wide[i]) > tw) cap = narrow;
    int lines = 0;
    while (lines < 3 && cap[lines]) lines++;
    // Portrait: the code and the text under it, centred together.
    const int x0 = tall ? (W - px) / 2 : 0;
    const int y0 = tall ? (H - px - lh / 2 - lines * lh) / 2 : (H - px) / 2;
    const bool eink = d.isEink();
    if (!eink) { d.setColor(UIColor::primary_txt); d.fillRect(x0, y0, px, px); }
    d.setColor(eink ? UIColor::primary_txt : UIColor::window_bkg);
    const int q = x0 + siteqr::QUIET * s, r = y0 + siteqr::QUIET * s;
    for (int y = 0; y < n; y++)
      for (int x = 0; x < n; x++)
        if (dark(x, y)) d.fillRect(q + x * s, r + y * s, s, s);
    d.setColor(UIColor::primary_txt);
    int ty = tall ? y0 + px + lh / 2 : (H - lines * lh) / 2;
    for (int i = 0; i < lines; i++) {
      int w = d.getTextWidth(cap[i]);
      d.drawTextEllipsized(w < tw ? tx + (tw - w) / 2 : tx, ty, tw, cap[i]);
      ty += lh;
    }
  }

  // All of a tab's blocks, drawn (or, through a measuring Flow, only counted).
  void layout(DisplayDriver& d, info::Flow& f, int rsv) {
    switch (tab()) {
      case TAB_RADIO:  tabRadio(d, f, rsv);  break;
#if ENV_INCLUDE_GPS == 1
      case TAB_GPS:    tabGps(d, f, rsv);    break;
#endif
      case TAB_POWER:  tabPower(d, f, rsv);  break;
      case TAB_MESH:   tabMesh(d, f, rsv);   break;
      case TAB_SYSTEM: tabSystem(d, f, rsv); break;
      default: break;
    }
  }

public:
  StatusScreen(UITask* task) : _task(task), _lpp(160) {
    addTab(TAB_RADIO, "Radio");
#if ENV_INCLUDE_GPS == 1
    addTab(TAB_GPS, "GPS");
#endif
#ifdef STATUS_HAS_SKY
    addTab(TAB_SKY, "Sky");
#endif
    addTab(TAB_POWER, "Power");
    addTab(TAB_MESH, "Mesh");
    addTab(TAB_SYSTEM, "System");
  }

  // Open on a given tab (Status page: Radio; the GPS shortcuts: GPS / Sky).
  void showTab(uint8_t t) {
    _qr = QR_NONE;
    for (uint8_t i = 0; i < _count; i++) if (_tabs[i] == t) { _cur = i; _scroll = 0; }
  }
  // GPS stays awake while its live tabs are on screen.
  bool wantsLiveGps() const { return tab() == TAB_GPS || tab() == TAB_SKY; }

  // Called from the UI loop on every pass; the history keeps its own pace.
  void sample() {
    _hist.tick(millis(), (int)radio_driver.getNoiseFloor(), battMv(), totalRx(), radio_driver.getLastSNR());
  }

  const info::History<HIST_N>& battHistory() const { return _hist.batt; }
  const info::History<HIST_N>& noiseHistory() const { return _hist.noise; }
  const info::History<HIST_N>& trafficHistory() const { return _hist.traffic; }

  // Contacts heard from in the last hour (cached for 10 s: it walks them all).
  static int heardLastHour() {
    static unsigned long at = 0;
    static int n = 0;
    if (at && millis() - at < 10000) return n;
    at = millis() | 1;
    n = 0;
    const uint32_t now = rtc_clock.getCurrentTime();
    const int nc = the_mesh.getNumContacts();
    for (int i = 0; i < nc; i++) {
      ContactInfo ci;
      if (!the_mesh.getContactByIdx(i + MAX_ANON_CONTACTS, ci)) continue;
      if (ci.lastmod && ci.lastmod + 3600 >= now) n++;
    }
    return n;
  }

  int render(DisplayDriver& display) override {
    display.setTextSize(1);
    display.setColor(UIColor::primary_txt);
    if (_qr) { renderQr(display); return 1000; }
    tabbar::draw(display, _labels, _count, _cur);
    const int top = display.listStart(), bottom = display.height();
    int next = 1000;

#ifdef STATUS_HAS_SKY
    if (tab() == TAB_SKY) {
      next = skyview::render(display, top, _signal, _task->getGPSState());
    } else
#endif
    {
      // Measure first, so a tab taller than the screen gets its scroll column.
      info::Flow m = info::Flow::measure();
      layout(display, m, 0);
      const long view = bottom - top;
      const int rsv = m.total_px > view ? scrollIndicatorColWidth(display) : 0;
      info::Flow f(top, bottom, _scroll);
      layout(display, f, rsv);
      _more = f.more;
      if (rsv) drawScrollIndicatorPx(display, top, view, f.total_px, view, f.skipped_px);
    }

    display.setColor(UIColor::primary_txt);
    if (_reset_menu.active) { _reset_menu.render(display); return 50; }
    return next;
  }

  bool handleInput(char c) override {
    if (_reset_menu.active) {
      auto res = _reset_menu.handleInput(c);
      if (res == PopupMenu::SELECTED && _reset_menu.selectedIndex() == 0) {
        diag::resetCounters();
        _hist.countersReset();
      }
      return true;
    }
    if (_qr) {   // Enter: the other code; anything else closes
      _qr = c == KEY_ENTER && _qr == QR_CONTACT ? QR_MANUAL : c == KEY_ENTER && _qr == QR_MANUAL ? QR_CONTACT : QR_NONE;
      return true;
    }
    if (keyIsPrev(c)) { tabbar::turn(_task->getDisplay(), _labels, _cur, -1); _cur = (_cur + _count - 1) % _count; _scroll = 0; return true; }
    if (keyIsNext(c)) { tabbar::turn(_task->getDisplay(), _labels, _cur, +1); _cur = (_cur + 1) % _count;          _scroll = 0; return true; }
    if (c == KEY_UP)   { if (_scroll > 0) _scroll--; return true; }
    if (c == KEY_DOWN) { if (_more) _scroll++; return true; }
#if ENV_INCLUDE_GPS == 1
    if (c == KEY_ENTER && tab() == TAB_GPS) { _task->toggleGPS(); return true; }
#endif
    if (c == KEY_ENTER && tab() == TAB_SKY) { _signal = !_signal; return true; }
    if (c == KEY_ENTER && tab() == TAB_SYSTEM) {
      _qr = contactqr::make(_contact_qr) ? QR_CONTACT : QR_MANUAL;
      return true;
    }
    if (c == KEY_CONTEXT_MENU && tab() == TAB_MESH) {
      _reset_menu.beginConfirm("Reset counters?", "Reset");
      return true;
    }
    if (c == KEY_CANCEL) { _task->gotoHomeScreen(); return true; }
    return false;
  }
};