import * as THREE from "three";
import {
  MAX_CAMERA_DISTANCE,
  MIN_CAMERA_DISTANCE,
  ZOOM_DISTANCE,
} from "./viewerConstants";
import { createViewerHud } from "./viewerHud";
import {
  classifyZoomLevel,
  computeZoomBlend,
  formatBytes,
  inventoryAmount,
  smoothBand,
} from "./viewerMath";
import { updatePanFromKeyboard } from "./viewerCamera";
import {
  createCirclePoints,
  shipLength,
  shipPresentationColor,
  shipSize,
  spatialNodeColor,
} from "./viewerSceneAppearance";
import {
  createBackdropStars,
  createNebulaClouds,
  createNebulaTexture,
} from "./viewerSceneFactory";
import {
  setShellReticleOpacity,
} from "./viewerControls";
import {
  recordPerformanceStats,
  updateNetworkPanel as renderNetworkPanel,
  updatePerformancePanel as renderPerformancePanel,
} from "./viewerTelemetry";
import { renderFrame, resizeViewer, stepCamera } from "./viewerRenderLoop";
import { updatePlanetPresentation } from "./viewerPresentation";
import {
  renderRecentEvents,
  updateGameStatus,
  updateSystemSummaries,
  updateWorldPresentation,
} from "./viewerWorldPresentation";
import {
  resolveFocusedBubbleId,
} from "./viewerSelection";
import { describeSelectionParent, updateSystemPanel } from "./viewerPanels";
import {
  createInitialNetworkStats,
  createInitialPerformanceStats,
} from "./viewerState";
import { ViewerWorldLifecycle } from "./viewerWorldLifecycle";
import { ViewerInteractionController } from "./viewerInteractionController";
import { ViewerNavigationController } from "./viewerNavigationController";
import { ViewerSceneDataController } from "./viewerSceneDataController";
import { ViewerPresentationController } from "./viewerPresentationController";
import { createViewerControllers, wireViewerEvents } from "./viewerControllerFactory";
import type { SceneNode } from "./viewerScenePrimitives";
import type { FactionSnapshot, ShipSnapshot } from "./contracts";
import type {
  BubbleVisual,
  CameraMode,
  ClaimVisual,
  ConstructionSiteVisual,
  DragMode,
  HistoryWindowState,
  MoonVisual,
  NetworkStats,
  NodeVisual,
  OrbitLineVisual,
  OrbitalAnchor,
  PerformanceStats,
  PlanetVisual,
  PresentationEntry,
  Selectable,
  ShipVisual,
  SpatialNodeVisual,
  StructureVisual,
  SystemSummaryVisual,
  SystemVisual,
  WorldState,
  ZoomLevel,
} from "./viewerTypes";

export class ViewerAppController {
  private readonly container: HTMLElement;
  private readonly renderer = new THREE.WebGLRenderer({ antialias: true });
  private readonly scene = new THREE.Scene();
  private readonly camera = new THREE.PerspectiveCamera(50, 1, 0.1, 160000);
  private readonly clock = new THREE.Clock();
  private readonly raycaster = new THREE.Raycaster();
  private readonly mouse = new THREE.Vector2();
  private readonly galaxyFocus = new THREE.Vector3(2200, 0, 300);
  private readonly systemFocusLocal = new THREE.Vector3();
  private readonly cameraOffset = new THREE.Vector3();
  private readonly keyState = new Set<string>();
  private readonly systemGroup = new THREE.Group();
  private readonly spatialNodeGroup = new THREE.Group();
  private readonly bubbleGroup = new THREE.Group();
  private readonly nodeGroup = new THREE.Group();
  private readonly stationGroup = new THREE.Group();
  private readonly claimGroup = new THREE.Group();
  private readonly constructionSiteGroup = new THREE.Group();
  private readonly shipGroup = new THREE.Group();
  private readonly ambienceGroup = new THREE.Group();
  private readonly gamePanelEl: HTMLDivElement;
  private readonly selectableTargets = new Map<THREE.Object3D, Selectable>();
  private readonly presentationEntries: PresentationEntry[] = [];
  private readonly nodeVisuals = new Map<string, NodeVisual>();
  private readonly spatialNodeVisuals = new Map<string, SpatialNodeVisual>();
  private readonly bubbleVisuals = new Map<string, BubbleVisual>();
  private readonly stationVisuals = new Map<string, StructureVisual>();
  private readonly claimVisuals = new Map<string, ClaimVisual>();
  private readonly constructionSiteVisuals = new Map<string, ConstructionSiteVisual>();
  private readonly shipVisuals = new Map<string, ShipVisual>();
  private readonly systemVisuals = new Map<string, SystemVisual>();
  private readonly systemSummaryVisuals = new Map<string, SystemSummaryVisual>();
  private readonly planetVisuals: PlanetVisual[] = [];
  private readonly orbitLines: OrbitLineVisual[] = [];
  private readonly statusEl: HTMLDivElement;
  private readonly gameSummaryEl: HTMLSpanElement;
  private readonly systemPanelEl: HTMLDivElement;
  private readonly systemTitleEl: HTMLHeadingElement;
  private readonly systemBodyEl: HTMLDivElement;
  private readonly detailTitleEl: HTMLHeadingElement;
  private readonly detailBodyEl: HTMLDivElement;
  private readonly factionStripEl: HTMLDivElement;
  private readonly networkSectionEl: HTMLDivElement;
  private readonly networkSummaryEl: HTMLSpanElement;
  private readonly networkPanelEl: HTMLDivElement;
  private readonly performanceSectionEl: HTMLDivElement;
  private readonly performanceSummaryEl: HTMLSpanElement;
  private readonly performancePanelEl: HTMLDivElement;
  private readonly errorEl: HTMLDivElement;
  private readonly historyLayerEl: HTMLDivElement;
  private readonly marqueeEl: HTMLDivElement;
  private readonly hoverLabelEl: HTMLDivElement;

  private world?: WorldState;
  private worldTimeSyncMs = performance.now();
  private stream?: EventSource;
  private currentStreamScopeKey = "";
  private readonly networkStats: NetworkStats = createInitialNetworkStats();
  private readonly performanceStats: PerformanceStats = createInitialPerformanceStats();

  private selectedItems: Selectable[] = [];
  private worldSignature = "";
  private zoomLevel: ZoomLevel = "system";
  private currentDistance = ZOOM_DISTANCE.system;
  private desiredDistance = ZOOM_DISTANCE.system;
  private orbitYaw = -2.3;
  private orbitPitch = 0.62;
  private cameraMode: CameraMode = "tactical";
  private dragMode?: DragMode;
  private dragPointerId?: number;
  private dragStart = new THREE.Vector2();
  private dragLast = new THREE.Vector2();
  private marqueeActive = false;
  private suppressClickSelection = false;
  private activeSystemId?: string;
  private cameraTargetShipId?: string;
  private readonly followCameraPosition = new THREE.Vector3();
  private readonly followCameraFocus = new THREE.Vector3();
  private readonly followCameraDirection = new THREE.Vector3(0, 0.16, 1);
  private readonly followCameraDesiredDirection = new THREE.Vector3(0, 0.16, 1);
  private readonly followCameraOffset = new THREE.Vector3();
  private readonly historyWindows: HistoryWindowState[] = [];
  private historyWindowCounter = 0;
  private historyWindowZCounter = 10;
  private historyWindowDragId?: string;
  private historyWindowDragPointerId?: number;
  private historyWindowDragOffset = new THREE.Vector2();
  private readonly worldLifecycle: ViewerWorldLifecycle;
  private readonly interactionController: ViewerInteractionController;
  private readonly navigationController: ViewerNavigationController;
  private readonly sceneDataController: ViewerSceneDataController;
  private readonly presentationController: ViewerPresentationController;

  constructor(container: HTMLElement) {
    this.container = container;
    this.renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
    this.renderer.outputColorSpace = THREE.SRGBColorSpace;

    this.scene.background = new THREE.Color(0x040912);
    this.scene.fog = new THREE.FogExp2(0x040912, 0.00011);
    this.scene.add(new THREE.AmbientLight(0x90a6c0, 0.55));
    const keyLight = new THREE.DirectionalLight(0xdcecff, 1.3);
    keyLight.position.set(1000, 1200, 800);
    this.scene.add(keyLight);
    this.scene.add(
      this.ambienceGroup,
      this.systemGroup,
      this.spatialNodeGroup,
      this.bubbleGroup,
      this.nodeGroup,
      this.stationGroup,
      this.claimGroup,
      this.constructionSiteGroup,
      this.shipGroup,
    );
    const hud = createViewerHud(document);
    this.gamePanelEl = hud.gamePanelEl;
    this.statusEl = hud.statusEl;
    this.gameSummaryEl = hud.gameSummaryEl;
    this.networkSectionEl = hud.networkSectionEl;
    this.systemPanelEl = hud.systemPanelEl;
    this.systemTitleEl = hud.systemTitleEl;
    this.systemBodyEl = hud.systemBodyEl;
    this.detailTitleEl = hud.detailTitleEl;
    this.detailBodyEl = hud.detailBodyEl;
    this.factionStripEl = hud.factionStripEl;
    this.networkSummaryEl = hud.networkSummaryEl;
    this.networkPanelEl = hud.networkPanelEl;
    this.performanceSectionEl = hud.performanceSectionEl;
    this.performanceSummaryEl = hud.performanceSummaryEl;
    this.performancePanelEl = hud.performancePanelEl;
    this.errorEl = hud.errorEl;
    this.historyLayerEl = hud.historyLayerEl;
    this.marqueeEl = hud.marqueeEl;
    this.hoverLabelEl = hud.hoverLabelEl;
    ({
      sceneDataController: this.sceneDataController,
      navigationController: this.navigationController,
      presentationController: this.presentationController,
      worldLifecycle: this.worldLifecycle,
      interactionController: this.interactionController,
    } = createViewerControllers(this));
    this.presentationController.initializeAmbience();

    this.container.append(this.renderer.domElement, hud.root);
    this.initializePanelToggles();
    wireViewerEvents(this);
    this.onResize();
    this.updateCamera(0);
  }

  private initializePanelToggles() {
    for (const panel of [this.gamePanelEl, this.networkSectionEl, this.performanceSectionEl]) {
      const toggle = panel.querySelector(".panel-toggle");
      if (!(toggle instanceof HTMLButtonElement)) {
        continue;
      }

      toggle.addEventListener("click", () => {
        const collapsed = panel.classList.toggle("is-collapsed");
        toggle.textContent = collapsed ? "+" : "-";
        toggle.setAttribute("aria-expanded", collapsed ? "false" : "true");
        toggle.setAttribute("aria-label", `${collapsed ? "Expand" : "Collapse"} ${panel.dataset.panelName ?? "panel"}`);
      });
    }
  }

  async start() {
    await this.worldLifecycle.bootstrapWorld();
    this.renderer.setAnimationLoop(() => this.render());
  }

  private refreshStreamScopeIfNeeded() {
    this.worldLifecycle.refreshStreamScopeIfNeeded();
  }

  private createWorldPresentationContext() {
    return this.sceneDataController.createWorldPresentationContext({
      world: this.world,
      activeSystemId: this.activeSystemId,
      zoomLevel: this.zoomLevel,
      orbitYaw: this.orbitYaw,
      camera: this.camera,
      systemFocusLocal: this.systemFocusLocal,
      toDisplayLocalPosition: this.toDisplayLocalPosition.bind(this),
      updateSystemDetailVisibility: () => this.navigationController.updateSystemDetailVisibility(),
      setShellReticleOpacity: (sprite, opacity) => this.setShellReticleOpacity(sprite, opacity),
    });
  }

  private rebuildFactions(_factions: FactionSnapshot[]) {
    this.worldLifecycle.rebuildFactions(_factions);
  }

  private updatePanels() {
    this.worldLifecycle.updatePanels();
  }

  private render() {
    renderFrame({
      clock: this.clock,
      renderer: this.renderer,
      scene: this.scene,
      camera: this.camera,
      updateCamera: (delta) => this.updateCamera(delta),
      updateAmbience: (delta) => this.presentationController.updateAmbience(delta),
      updatePlanetPresentation: () => this.presentationController.updatePlanetPresentation(),
      updateShipPresentation: () => this.presentationController.updateShipPresentation(),
      updateNetworkPanel: () => this.presentationController.updateNetworkPanel(),
      applyZoomPresentation: () => this.presentationController.applyZoomPresentation(),
      recordPerformanceStats: (frameMs) => this.presentationController.recordPerformanceStats(frameMs),
      updatePerformancePanel: () => this.presentationController.updatePerformancePanel(),
    });
  }

  private updateAmbience(delta: number) {
    this.ambienceGroup.position.copy(this.camera.position);
    this.ambienceGroup.rotation.y += delta * 0.005;
    this.ambienceGroup.rotation.x = Math.sin(performance.now() * 0.00003) * 0.015;
  }

  private updateCamera(delta: number) {
    const nextState = stepCamera({
      currentDistance: this.currentDistance,
      desiredDistance: this.desiredDistance,
      orbitPitch: this.orbitPitch,
      delta,
    });
    this.currentDistance = nextState.currentDistance;
    this.zoomLevel = nextState.zoomLevel;
    this.orbitPitch = nextState.orbitPitch;
    this.navigationController.updateActiveSystem();
    if (this.cameraMode === "follow" && this.navigationController.updateFollowCamera(delta)) {
      return;
    }

    this.updatePanFromKeyboard(delta);
    this.orbitPitch = THREE.MathUtils.clamp(this.orbitPitch, 0.18, 1.3);

    const horizontalDistance = this.currentDistance * Math.cos(this.orbitPitch);
    const focus = this.navigationController.getCameraFocusWorldPosition();
    this.cameraOffset.set(
      Math.cos(this.orbitYaw) * horizontalDistance,
      this.currentDistance * Math.sin(this.orbitPitch),
      Math.sin(this.orbitYaw) * horizontalDistance,
    );
    this.camera.position.copy(focus).add(this.cameraOffset);
    this.camera.lookAt(focus);
  }

  private updatePanFromKeyboard(delta: number) {
    updatePanFromKeyboard(
      this.keyState,
      this.orbitYaw,
      this.currentDistance,
      this.zoomLevel,
      this.activeSystemId,
      this.systemFocusLocal,
      this.galaxyFocus,
      delta,
      MIN_CAMERA_DISTANCE,
      MAX_CAMERA_DISTANCE,
    );
  }

  private updateSystemSummaries() {
    this.presentationController.updateSystemSummaries();
  }

  private registerPresentation(
    detail: SceneNode,
    icon: SceneNode,
    hideDetailInUniverse: boolean,
    hideIconInUniverse = false,
    systemId?: string,
  ) {
    this.presentationEntries.push({ detail, icon, systemId, hideDetailInUniverse, hideIconInUniverse });
  }

  private renderRecentEvents(entityKind: string, entityId: string) {
    return this.presentationController.renderRecentEvents(entityKind, entityId);
  }

  private updateGamePanel(mode: string) {
    this.presentationController.updateGamePanel(mode);
  }

  private screenPointFromClient(clientX: number, clientY: number) {
    return this.presentationController.screenPointFromClient(clientX, clientY);
  }

  private refreshHistoryWindows() {
    this.interactionController.refreshHistoryWindows();
  }

  private resolveFocusedBubbleId() {
    return resolveFocusedBubbleId(this.world, this.selectedItems);
  }

  private onResize = () => {
    resizeViewer({
      renderer: this.renderer,
      camera: this.camera,
    });
  };

  private setShellReticleOpacity(sprite: SystemVisual["shellReticle"], opacity: number) {
    setShellReticleOpacity(sprite, opacity);
  }

  private describeSelectionParent(selection: Selectable) {
    return describeSelectionParent(this.world, selection, this.stationVisuals, this.nodeVisuals);
  }

  private toDisplayLocalPosition(localPosition: THREE.Vector3, systemId?: string) {
    return this.navigationController.toDisplayLocalPosition(localPosition, systemId);
  }

  private updateSystemPanel() {
    this.presentationController.updateSystemPanel();
  }
}