package market.guess.ui.desktop.controllers;

import java.util.ArrayList;
import java.util.function.Consumer;
import javafx.collections.ListChangeListener;
import javafx.css.PseudoClass;
import javafx.fxml.FXML;
import javafx.scene.Node;
import javafx.scene.chart.LineChart;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import market.guess.model.event.CommissionTiming;
import market.guess.model.event.EventStatus;
import market.guess.model.event.MechanismType;
import market.guess.ui.desktop.AppState;
import market.guess.ui.desktop.components.CommissionFilter;
import market.guess.ui.desktop.components.EventListCell;
import market.guess.ui.desktop.components.LadderItemView;
import market.guess.ui.desktop.components.MechanismFilter;
import market.guess.ui.desktop.components.ParticipantItemView;
import market.guess.ui.desktop.components.TradeHistoryItemView;
import market.guess.ui.desktop.components.graphic.EqualizerGraphic;
import market.guess.ui.desktop.components.graphic.Graphic;
import market.guess.ui.desktop.model.ChartPoint;
import market.guess.ui.desktop.model.EventData;
import market.guess.ui.desktop.model.OrderBook;
import market.guess.ui.desktop.model.ParticipantRow;
import market.guess.ui.desktop.model.TradeRow;
import market.guess.ui.desktop.util.Charts;
import market.guess.ui.desktop.util.Format;
import market.guess.ui.desktop.util.Views;

public class EventsTabController {
  private static final PseudoClass ACTIVE = PseudoClass.getPseudoClass("active");
  private static final PseudoClass CLOSED = PseudoClass.getPseudoClass("closed");
  private static final PseudoClass IDLE = PseudoClass.getPseudoClass("idle");

  private AppState state;
  private Runnable onNewEvent;
  private Consumer<EventData> onOpenEvent;
  private Runnable onCloseEvent;
  private Graphic equalizer;
  private boolean updatingSelection = false;

  @FXML private Button methodFilterAllBtn;
  @FXML private Button methodFilterLmsrBtn;
  @FXML private Button methodFilterObBtn;
  @FXML private Button statusFilterAllBtn;
  @FXML private Button statusFilterNotStartedBtn;
  @FXML private Button statusFilterActiveBtn;
  @FXML private Button statusFilterClosedBtn;
  @FXML private Button feeFilterAllBtn;
  @FXML private Button feeFilterPurchaseBtn;
  @FXML private Button feeFilterCloseBtn;

  @FXML private ListView<EventData> eventListContainer;
  @FXML private Label eventCountLabel;

  @FXML private VBox eventDetailCard;
  @FXML private Label eventNameLabel;
  @FXML private Label eventDescLabel;
  @FXML private Button openEventBtn;
  @FXML private Button closeEventBtn;

  @FXML private Label metaMethodLabel;
  @FXML private Label metaStatusLabel;
  @FXML private HBox livePill;
  @FXML private StackPane liveBarsBox;
  @FXML private Label liveLabel;
  @FXML private Label metaMmLabel;
  @FXML private Label metaFeeLabel;
  @FXML private Label metaContractLabel;

  @FXML private VBox lmsrSection;
  @FXML private Label lmsrYesPriceLabel;
  @FXML private ProgressBar lmsrYesProgressBar;
  @FXML private Label lmsrYesSharesLabel;
  @FXML private Label lmsrNoPriceLabel;
  @FXML private ProgressBar lmsrNoProgressBar;
  @FXML private Label lmsrNoSharesLabel;
  @FXML private Label lmsrChartSubLabel;
  @FXML private LineChart<Number, Number> lmsrChart;
  @FXML private VBox tradeHistoryRowsContainer;

  @FXML private VBox orderBookSection;
  @FXML private Label yesBookCountLabel;
  @FXML private Label yesLastLabel;
  @FXML private Label yesMidLabel;
  @FXML private Label yesBestBidLabel;
  @FXML private Label yesBestAskLabel;
  @FXML private Label yesSpreadLabel;
  @FXML private VBox yesBookLadderList;

  @FXML private Label noBookCountLabel;
  @FXML private Label noLastLabel;
  @FXML private Label noMidLabel;
  @FXML private Label noBestBidLabel;
  @FXML private Label noBestAskLabel;
  @FXML private Label noSpreadLabel;
  @FXML private VBox noBookLadderList;

  @FXML private Label obChartSubLabel;
  @FXML private LineChart<Number, Number> obChart;

  @FXML private VBox participantsRowsContainer;
  @FXML private HBox resolvedBanner;
  @FXML private Label resolvedBannerText;

  public void init(AppState state) {
    this.state = state;
    equalizer = EqualizerGraphic.create();
    liveBarsBox.getChildren().setAll(equalizer.getNode());

    eventListContainer.setCellFactory(lv -> new EventListCell());
    eventListContainer
        .getSelectionModel()
        .selectedItemProperty()
        .addListener(
            (obs, oldVal, newVal) -> {
              if (updatingSelection) return;
              if (newVal != null && state != null) {
                state.setSelectedEvent(newVal);
              }
            });

    state
        .selectedEventProperty()
        .addListener(
            (obs, oldVal, newVal) -> {
              if (newVal != null) {
                if (!newVal.equals(eventListContainer.getSelectionModel().getSelectedItem())) {
                  updatingSelection = true;
                  try {
                    eventListContainer.getSelectionModel().select(newVal);
                  } finally {
                    updatingSelection = false;
                  }
                }
              }
              refreshDetailCard(newVal);
            });

    state.filterMethodProperty().addListener((obs, oldVal, newVal) -> refreshListAndFilters());
    state.filterStatusProperty().addListener((obs, oldVal, newVal) -> refreshListAndFilters());
    state.filterFeeProperty().addListener((obs, oldVal, newVal) -> refreshListAndFilters());
    state
        .getEvents()
        .addListener(
            (ListChangeListener<EventData>)
                c -> {
                  refreshListAndFilters();
                  refreshDetailCard(state.selectedEvent());
                });
    state
        .animationsOnProperty()
        .addListener(
            (obs, oldVal, newVal) -> {
              var sel = state.selectedEvent();
              boolean isActive = sel != null && sel.status == EventStatus.ACTIVE;
              equalizer.setPlaying(newVal && isActive);
            });
  }

  public void setOnNewEvent(Runnable onNewEvent) {
    this.onNewEvent = onNewEvent;
  }

  public void setOnOpenEvent(Consumer<EventData> onOpenEvent) {
    this.onOpenEvent = onOpenEvent;
  }

  public void setOnCloseEvent(Runnable onCloseEvent) {
    this.onCloseEvent = onCloseEvent;
  }

  public void refresh() {
    if (state == null) return;
    refreshListAndFilters();
    refreshDetailCard(state.selectedEvent());
  }

  private void refreshListAndFilters() {
    if (state == null) return;

    // 1. Update filter button selections
    Views.setSelected(methodFilterAllBtn, state.getFilterMethod() == MechanismFilter.ALL);
    Views.setSelected(methodFilterLmsrBtn, state.getFilterMethod() == MechanismFilter.LMSR);
    Views.setSelected(methodFilterObBtn, state.getFilterMethod() == MechanismFilter.ORDER_BOOK);

    Views.setSelected(statusFilterAllBtn, state.getFilterStatus() == null);
    Views.setSelected(statusFilterNotStartedBtn, state.getFilterStatus() == EventStatus.DRAFT);
    Views.setSelected(statusFilterActiveBtn, state.getFilterStatus() == EventStatus.ACTIVE);
    Views.setSelected(statusFilterClosedBtn, state.getFilterStatus() == EventStatus.SETTLED);

    Views.setSelected(feeFilterAllBtn, state.getFilterFee() == CommissionFilter.ALL);
    Views.setSelected(feeFilterPurchaseBtn, state.getFilterFee() == CommissionFilter.PURCHASE);
    Views.setSelected(feeFilterCloseBtn, state.getFilterFee() == CommissionFilter.CLOSE);

    // 2. Update list
    var filtered =
        state.getEvents().stream()
            .filter(
                e ->
                    state.getFilterMethod() == MechanismFilter.ALL
                        || (state.getFilterMethod() == MechanismFilter.LMSR
                            && e.type == MechanismType.LMSR)
                        || (state.getFilterMethod() == MechanismFilter.ORDER_BOOK
                            && e.type == MechanismType.ORDER_BOOK))
            .filter(e -> state.getFilterStatus() == null || e.status == state.getFilterStatus())
            .filter(
                e ->
                    state.getFilterFee() == CommissionFilter.ALL
                        || (state.getFilterFee() == CommissionFilter.PURCHASE
                            && e.feeMode == CommissionTiming.ON_PURCHASE)
                        || (state.getFilterFee() == CommissionFilter.CLOSE
                            && e.feeMode == CommissionTiming.ON_CLOSE))
            .toList();

    updatingSelection = true;
    try {
      eventListContainer.getItems().setAll(filtered);
      eventCountLabel.setText(
          filtered.size() + " of " + state.getEvents().size() + " events shown");

      var sel = state.selectedEvent();
      EventData match = null;
      if (sel != null) {
        for (var e : filtered) {
          if (e.id.equals(sel.id)) {
            match = e;
            break;
          }
        }
      }
      if (match != null) {
        eventListContainer.getSelectionModel().select(match);
      } else if (!filtered.isEmpty()) {
        eventListContainer.getSelectionModel().select(0);
      }
    } finally {
      updatingSelection = false;
    }
  }

  private void refreshDetailCard(EventData selected) {
    if (selected == null) {
      eventDetailCard.setVisible(false);
      return;
    }
    eventDetailCard.setVisible(true);

    eventNameLabel.setText(selected.num + ". " + selected.name);
    eventDescLabel.setText(selected.desc);

    // Open = go trade: any unblocked user on an ACTIVE event, or the MM activating their DRAFT.
    var actor = state.getActingUser();
    boolean isMm = selected.mm.equals(state.getActingUserName());
    boolean canOpen =
        actor != null
            && !actor.blocked
            && (selected.status == EventStatus.ACTIVE
                || (selected.status == EventStatus.DRAFT && isMm));
    boolean canClose =
        selected.status == EventStatus.ACTIVE && selected.mm.equals(state.getActingUserName());

    openEventBtn.setText(selected.status == EventStatus.DRAFT ? "Start Event" : "Trade");
    openEventBtn.setVisible(canOpen);
    openEventBtn.setManaged(canOpen);
    closeEventBtn.setVisible(canClose);
    closeEventBtn.setManaged(canClose);

    // Meta fields
    metaMethodLabel.setText(selected.type == MechanismType.LMSR ? "LMSR" : "Order Book");
    metaStatusLabel.setText(selected.status.name());

    // LIVE pill: only an ACTIVE market needs to look like order flow is arriving.
    boolean isActive = selected.status == EventStatus.ACTIVE;
    boolean isEnded = selected.status == EventStatus.SETTLED;
    liveLabel.setText(isActive ? "LIVE" : isEnded ? "ENDED" : "IDLE");
    livePill.pseudoClassStateChanged(ACTIVE, isActive);
    livePill.pseudoClassStateChanged(CLOSED, isEnded);
    livePill.pseudoClassStateChanged(IDLE, !isActive && !isEnded);
    equalizer.setPlaying(state.isAnimationsOn() && isActive);
    metaMmLabel.setText(selected.mm);
    metaFeeLabel.setText(selected.feeText());
    metaContractLabel.setText(Format.money(selected.contract));

    // Sections
    boolean isLmsr = selected.type == MechanismType.LMSR;
    lmsrSection.setVisible(isLmsr);
    lmsrSection.setManaged(isLmsr);
    orderBookSection.setVisible(!isLmsr);
    orderBookSection.setManaged(!isLmsr);

    if (isLmsr) {
      refreshLmsr(selected);
    } else {
      refreshOrderBook(selected);
    }

    // Trade history table
    var tRows = new ArrayList<Node>(selected.trades.size());
    for (var t : selected.trades) {
      tRows.add(buildTradeHistoryRow(t));
    }
    tradeHistoryRowsContainer.getChildren().setAll(tRows);

    // Participants table
    var pRows = new ArrayList<Node>(selected.participants.size());
    for (var p : selected.participants) {
      pRows.add(buildParticipantRow(p));
    }
    participantsRowsContainer.getChildren().setAll(pRows);

    // Resolved banner
    boolean isClosed = selected.status == EventStatus.SETTLED;
    resolvedBanner.setVisible(isClosed);
    resolvedBanner.setManaged(isClosed);
    if (isClosed) {
      resolvedBannerText.setText(
          "Winning option: "
              + selected.resolvedOption
              + "  "
              + selected.yesShares
              + " YES / "
              + selected.noShares
              + " NO shares bought  contract emptied to holders, "
              + selected.feePercent
              + "% fee moved to "
              + selected.mm
              + ".");
    }
  }

  private void refreshLmsr(EventData e) {
    lmsrYesPriceLabel.setText(Format.money(e.yesPrice));
    lmsrYesProgressBar.setProgress(e.yesPrice.doubleValue());
    lmsrYesSharesLabel.setText(
        e.yesShares + " shares  p = " + Format.prob(e.yesPrice.doubleValue()));

    lmsrNoPriceLabel.setText(Format.money(e.noPrice));
    lmsrNoProgressBar.setProgress(e.noPrice.doubleValue());
    lmsrNoSharesLabel.setText(e.noShares + " shares  p = " + Format.prob(e.noPrice.doubleValue()));

    lmsrChartSubLabel.setText("YES / NO  LMSR b = " + e.liquidityB);
    var noPts = new ArrayList<ChartPoint>();
    for (var p : e.chart) noPts.add(new ChartPoint(p.x(), 1.0 - p.y()));
    Charts.setDualSeries(lmsrChart, "YES", e.chart, "NO", noPts);
  }

  private void refreshOrderBook(EventData e) {
    obChartSubLabel.setText(
        "last trade YES  base d = " + (e.baseValueD != null ? Format.money(e.baseValueD) : "—"));
    Charts.setSingleSeries(obChart, "value", e.chart);

    populateBookSide(
        e.yesBook,
        yesBookCountLabel,
        yesLastLabel,
        yesBestBidLabel,
        yesBestAskLabel,
        yesMidLabel,
        yesSpreadLabel,
        yesBookLadderList);
    populateBookSide(
        e.noBook,
        noBookCountLabel,
        noLastLabel,
        noBestBidLabel,
        noBestAskLabel,
        noMidLabel,
        noSpreadLabel,
        noBookLadderList);
  }

  private void populateBookSide(
      OrderBook book,
      Label countLabel,
      Label lastLabel,
      Label bestBidLabel,
      Label bestAskLabel,
      Label midLabel,
      Label spreadLabel,
      VBox ladderList) {
    if (book == null) {
      ladderList.getChildren().clear();
      countLabel.setText("0 orders");
      for (var l : new Label[] {lastLabel, bestBidLabel, bestAskLabel, midLabel, spreadLabel}) {
        l.setText("—");
      }
      return;
    }

    countLabel.setText(book.rows.size() + " orders");
    lastLabel.setText(book.last != null ? book.last : "—");
    bestBidLabel.setText(book.bid != null ? book.bid : "—");
    bestAskLabel.setText(book.ask != null ? book.ask : "—");
    midLabel.setText(book.mid != null ? book.mid : "—");
    spreadLabel.setText(book.spread != null ? book.spread : "—");

    var rows = new ArrayList<Node>(book.rows.size());
    for (var r : book.rows) {
      rows.add(new LadderItemView(r));
    }
    ladderList.getChildren().setAll(rows);
  }

  private Node buildTradeHistoryRow(TradeRow t) {
    return new TradeHistoryItemView(t);
  }

  private Node buildParticipantRow(ParticipantRow p) {
    return new ParticipantItemView(p);
  }

  // ---- FXML Handlers ----------------------------------------------------

  @FXML
  private void handleMethodAll() {
    if (state != null) state.setFilterMethod(MechanismFilter.ALL);
  }

  @FXML
  private void handleMethodLmsr() {
    if (state != null) state.setFilterMethod(MechanismFilter.LMSR);
  }

  @FXML
  private void handleMethodOb() {
    if (state != null) state.setFilterMethod(MechanismFilter.ORDER_BOOK);
  }

  @FXML
  private void handleStatusAll() {
    if (state != null) state.setFilterStatus(null);
  }

  @FXML
  private void handleStatusNotStarted() {
    if (state != null) state.setFilterStatus(EventStatus.DRAFT);
  }

  @FXML
  private void handleStatusActive() {
    if (state != null) state.setFilterStatus(EventStatus.ACTIVE);
  }

  @FXML
  private void handleStatusClosed() {
    if (state != null) state.setFilterStatus(EventStatus.SETTLED);
  }

  @FXML
  private void handleFeeAll() {
    if (state != null) state.setFilterFee(CommissionFilter.ALL);
  }

  @FXML
  private void handleFeePurchase() {
    if (state != null) state.setFilterFee(CommissionFilter.PURCHASE);
  }

  @FXML
  private void handleFeeClose() {
    if (state != null) state.setFilterFee(CommissionFilter.CLOSE);
  }

  @FXML
  private void handleNewEvent() {
    if (onNewEvent != null) {
      onNewEvent.run();
    }
  }

  @FXML
  private void handleOpenEvent() {
    if (state != null) {
      var e = state.selectedEvent();
      if (e != null && onOpenEvent != null) {
        onOpenEvent.accept(e);
      }
    }
  }

  @FXML
  private void handleCloseEvent() {
    if (onCloseEvent != null) {
      onCloseEvent.run();
    }
  }
}