/**
 * Begehbare 3D-Visualisierung des Gartens Egglihaldenstrasse 9a, Abtwil SG.
 *
 * Die gesamte Geometrie ist massstaeblich aus dem Gartenplan 1 der
 * Garten Design AG (1:100) abgeleitet; das Wohnhaus zusaetzlich aus den
 * Projektplaenen von EHLE Architekten. Siehe tools/ fuer die Datenpipeline.
 */
import {
  ACESFilmicToneMapping, Group, PCFSoftShadowMap, PerspectiveCamera, Scene,
  SRGBColorSpace, Vector3, WebGLRenderer,
} from 'three';
import './style.css';
import { loadSite, makeHeightSampler, type SiteData } from './site';
import { buildTerrain } from './scene/terrain';
import { buildSurfaces } from './scene/surfaces';
import { buildStelen, buildProps, buildLamps, buildLinear, treppeTritte } from './scene/structures';
import { buildWalls } from './scene/walls';
import { buildVegetation } from './scene/vegetation';
import { buildBuilding, buildNeighbourBuildings } from './scene/building';
import { buildEnvironment } from './scene/environment';
import { Walker, isTouch, obstacleFromSegment, type Obstacle } from './controls/walker';
import { setupHud } from './ui/hud';

const CENTER: [number, number] = [-9.5, -1.0];
const BOUNDS = { x0: -24.0, z0: -12.5, x1: 7.5, z1: 8.5 };

async function main() {
  const canvas = document.getElementById('view') as HTMLCanvasElement;
  const fill = document.getElementById('loader-fill') as HTMLSpanElement;
  const note = document.getElementById('loader-note') as HTMLDivElement;
  const progress = (pct: number, text: string) => {
    fill.style.width = `${pct}%`;
    note.textContent = text;
    return new Promise<void>((r) => requestAnimationFrame(() => r()));
  };

  const renderer = new WebGLRenderer({ canvas, antialias: true, powerPreference: 'high-performance' });
  renderer.setPixelRatio(Math.min(devicePixelRatio, 2));
  renderer.outputColorSpace = SRGBColorSpace;
  renderer.toneMapping = ACESFilmicToneMapping;
  renderer.toneMappingExposure = 0.94;
  renderer.shadowMap.enabled = true;
  renderer.shadowMap.type = PCFSoftShadowMap;

  const scene = new Scene();
  const camera = new PerspectiveCamera(62, 1, 0.08, 1400);

  await progress(8, 'Gartenplan wird geladen …');
  const site: SiteData = await loadSite();
  const height = makeHeightSampler(site.terrain);

  await progress(22, 'Gelände wird modelliert …');
  scene.add(buildTerrain(site.terrain));

  await progress(38, 'Beläge werden verlegt …');
  scene.add(buildSurfaces(site.surfaces, site.slabs, height));

  await progress(52, 'Mauern und Bauteile …');
  scene.add(buildWalls(site.walls, height));
  scene.add(buildStelen(site.stelen, height));
  scene.add(buildProps(site.props, height));
  scene.add(buildLinear(site.linear, height));

  await progress(66, 'Haus und Nachbarschaft …');
  scene.add(buildBuilding(site.building));
  scene.add(buildNeighbourBuildings(site.neighbourBuildings));

  await progress(80, 'Bepflanzung wird gesetzt …');
  scene.add(buildVegetation(site.plants, site.trees, height));

  await progress(90, 'Licht und Himmel …');
  const lamps = buildLamps(site.lamps, height);
  scene.add(lamps.group);
  const env = buildEnvironment(scene, {
    lat: site.meta.location.lat,
    lon: site.meta.location.lon,
    northBearingOfSiteX: site.meta.location.northBearingOfSiteX,
    center: CENTER,
    radius: 26,
  });
  scene.add(env.group);

  // -- Begehbare Bauteile --------------------------------------------------
  // Stufen und Treppen stecken nicht im Hoehenraster, sondern sind eigene
  // Koerper. Damit man sie wirklich begehen kann, wird ihre Trittflaeche in
  // die Hoehenabfrage des Rundgangs eingerechnet - sonst blieben sie blosse
  // Hindernisse, um die man herumlaufen muss.
  interface Tritt { cx: number; cz: number; hw: number; hd: number; rot: number; top: number }
  const tritte: Tritt[] = [];
  for (const p of site.props) {
    if (p.type !== 'stufe' || p.top === undefined) continue;
    tritte.push({
      cx: p.x, cz: p.z, hw: p.w / 2, hd: p.d / 2,
      rot: (p.rot * Math.PI) / 180, top: p.top,
    });
  }
  for (const f of site.linear) {
    if (f.kind === 'treppe') tritte.push(...treppeTritte(f));
  }
  const onTritt = (t: Tritt, x: number, z: number) => {
    const dx = x - t.cx, dz = z - t.cz;
    const c = Math.cos(-t.rot), s = Math.sin(-t.rot);
    return Math.abs(dx * c - dz * s) <= t.hw && Math.abs(dx * s + dz * c) <= t.hd;
  };
  /** Hoehe unter den Fuessen: Gelaende oder die hoechste Trittflaeche darauf. */
  const walkHeight = (x: number, z: number) => {
    let y = height(x, z);
    for (const t of tritte) if (onTritt(t, x, z) && t.top > y) y = t.top;
    return y;
  };

  // -- Hindernisse fuer den Rundgang --------------------------------------
  const obstacles: Obstacle[] = [];
  const b = site.building;
  const [bx0, bz0] = b.outline[0];
  const bx1 = b.outline[1][0];
  const bz1 = b.outline[2][1];
  // Baukoerper ohne die begehbare Loggia: zwei Rechtecke
  obstacles.push({
    cx: (bx0 + bx1) / 2, cz: (bz0 + b.loggia.z0) / 2,
    hw: (bx1 - bx0) / 2, hd: (b.loggia.z0 - bz0) / 2, rot: 0,
  });
  obstacles.push({
    cx: (b.loggia.x1 + bx1) / 2, cz: (b.loggia.z0 + bz1) / 2,
    hw: (bx1 - b.loggia.x1) / 2, hd: (bz1 - b.loggia.z0) / 2, rot: 0,
  });
  for (const nb of site.neighbourBuildings) {
    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
    for (const [x, z] of nb.outline) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
    obstacles.push({ cx: (x0 + x1) / 2, cz: (z0 + z1) / 2, hw: (x1 - x0) / 2, hd: (z1 - z0) / 2, rot: 0 });
  }
  for (const w of site.walls) {
    for (let i = 1; i < w.path.length; i++) {
      obstacles.push(obstacleFromSegment(w.path[i - 1], w.path[i], w.t + 0.1));
    }
  }
  // Gelaender begrenzen den Rundgang, Treppen und Rinnen bleiben begehbar.
  for (const f of site.linear) {
    if (f.kind !== 'gelaender') continue;
    for (let i = 1; i < f.path.length; i++) {
      obstacles.push(obstacleFromSegment(f.path[i - 1], f.path[i], 0.14));
    }
  }
  for (const p of site.props) {
    // Stufen sind begehbar, kein Hindernis - sie stehen in `tritte`.
    if (p.type === 'schacht' || p.type === 'wasserhahn' || p.type === 'stufe') continue;
    obstacles.push({ cx: p.x, cz: p.z, hw: p.w / 2, hd: p.d / 2, rot: (p.rot * Math.PI) / 180 });
  }
  for (const pl of site.plants) {
    if (pl.type !== 'hecke' || !pl.polygon) continue;
    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
    for (const [x, z] of pl.polygon) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
    obstacles.push({ cx: (x0 + x1) / 2, cz: (z0 + z1) / 2, hw: (x1 - x0) / 2, hd: (z1 - z0) / 2, rot: 0 });
  }
  for (const t of site.trees) {
    obstacles.push({ cx: t.x, cz: t.z, hw: 0.22, hd: 0.22, rot: 0 });
  }
  // Der Sichtschutz ist mannshoch und damit undurchdringlich: aufrechte
  // Travertinstelen und die Eibengruppen dazwischen.
  for (const s of site.stelen) {
    const hw = s.rot === 0 ? s.len / 2 : s.t / 2;
    const hd = s.rot === 0 ? s.t / 2 : s.len / 2;
    obstacles.push({ cx: s.x, cz: s.z, hw, hd, rot: 0 });
  }
  for (const p of site.plants) {
    if (p.type !== 'eibe' || p.x === undefined || p.z === undefined) continue;
    obstacles.push({ cx: p.x, cz: p.z, hw: 0.26, hd: 0.26, rot: 0 });
  }

  const walker = new Walker(camera, { height: walkHeight, obstacles, bounds: BOUNDS });
  walker.attach(canvas);
  const start = site.startViews[0];
  walker.teleport(start.x, start.z, start.yaw);

  // -- Uebersichtsmodus ----------------------------------------------------
  const orbit = {
    active: false,
    yaw: -0.7,
    pitch: 0.72,
    distance: 42,
    target: new Vector3(CENTER[0], 0.5, CENTER[1]),
    apply() {
      const cp = Math.cos(this.pitch), sp = Math.sin(this.pitch);
      camera.position.set(
        this.target.x + this.distance * cp * Math.sin(this.yaw),
        this.target.y + this.distance * sp,
        this.target.z + this.distance * cp * Math.cos(this.yaw),
      );
      camera.lookAt(this.target);
    },
  };

  let dragging = false;
  let lastPointer = { x: 0, y: 0 };
  canvas.addEventListener('pointerdown', (e) => {
    if (!orbit.active) return;
    dragging = true;
    lastPointer = { x: e.clientX, y: e.clientY };
    canvas.setPointerCapture(e.pointerId);
  });
  canvas.addEventListener('pointermove', (e) => {
    if (!orbit.active || !dragging) return;
    orbit.yaw -= (e.clientX - lastPointer.x) * 0.006;
    orbit.pitch = Math.max(0.12, Math.min(1.45, orbit.pitch + (e.clientY - lastPointer.y) * 0.004));
    lastPointer = { x: e.clientX, y: e.clientY };
    orbit.apply();
  });
  canvas.addEventListener('pointerup', () => { dragging = false; });
  canvas.addEventListener('wheel', (e) => {
    if (!orbit.active) return;
    e.preventDefault();
    orbit.distance = Math.max(14, Math.min(110, orbit.distance * (1 + Math.sign(e.deltaY) * 0.12)));
    orbit.apply();
  }, { passive: false });

  // -- Bedienoberflaeche ---------------------------------------------------
  const hud = setupHud({
    site,
    onView: (v) => {
      if (orbit.active) hud.setMode('walk');
      walker.teleport(v.x, v.z, v.yaw);
    },
    onMode: (mode) => {
      orbit.active = mode === 'overview';
      walker.setEnabled(!orbit.active);
      if (orbit.active) {
        if (document.pointerLockElement) document.exitPointerLock();
        orbit.apply();
      } else {
        walker.teleport(walker.position.x, walker.position.z, walker.yawDegrees);
      }
      canvas.style.cursor = orbit.active ? 'grab' : 'default';
    },
    onJoystick: (x, y, active) => walker.setJoystick(x, y, active),
  });
  walker.onPointerLockChange = (locked) => hud.setPointerLocked(locked);

  // -- Renderschleife ------------------------------------------------------
  function resize() {
    const w = canvas.clientWidth || window.innerWidth;
    const h = canvas.clientHeight || window.innerHeight;
    renderer.setSize(w, h, false);
    camera.aspect = w / h;
    camera.updateProjectionMatrix();
  }
  window.addEventListener('resize', resize);
  resize();

  let last = performance.now();
  let lastSun = { hours: -1, day: -1 };

  function frame(now: number) {
    const dt = Math.min(0.05, (now - last) / 1000);
    last = now;

    const t = hud.time();
    if (t.hours !== lastSun.hours || t.day !== lastSun.day) {
      const sun = env.update(t.day, t.hours);
      lamps.setOn(env.isDark());
      hud.setSunReadout(sun);
      lastSun = t;
    }

    if (orbit.active) {
      orbit.apply();
    } else {
      walker.update(dt);
    }

    renderer.render(scene, camera);
    requestAnimationFrame(frame);
  }

  await progress(100, 'Bereit.');
  document.getElementById('loader')!.classList.add('done');
  document.getElementById('hud')!.hidden = false;
  if (isTouch()) document.getElementById('joystick')!.hidden = false;
  requestAnimationFrame(frame);

  // Zugriff fuer Entwicklung und automatisierte Bildkontrolle
  (window as unknown as { garten: unknown }).garten = {
    scene, camera, site, env, walker, orbit, hud, renderer, Group,
    setOverview(on: boolean) { hud.setMode(on ? 'overview' : 'walk'); },
  };
}

main().catch((err) => {
  console.error(err);
  const note = document.getElementById('loader-note');
  if (note) note.textContent = `Fehler beim Laden: ${(err as Error).message}`;
});