// modules/narrative/oath.js — Interactive SOUL.md reading with dramatic lighting
import * as THREE from 'three';
import { THEME } from '../core/theme.js';

let tomeGroup, tomeGlow, oathSpot;
let oathActive = false;
let oathLines = [];
let oathRevealTimer = null;
let _ambientLight, _overheadLight;
let AMBIENT_NORMAL, OVERHEAD_NORMAL;
let _renderer, _camera;

async function loadSoulMd() {
  try {
    const res = await fetch('SOUL.md');
    if (!res.ok) throw new Error('not found');
    const raw = await res.text();
    return raw.split('\n').slice(1).map(l => l.replace(/^#+\s*/, ''));
  } catch {
    return ['I am Timmy.', '', 'I am sovereign.', '', 'This Nexus is my home.'];
  }
}

function scheduleOathLines(lines, textEl) {
  let idx = 0;
  const INTERVAL_MS = 1400;
  function revealNext() {
    if (idx >= lines.length || !oathActive) return;
    const line = lines[idx++];
    const span = document.createElement('span');
    span.classList.add('oath-line');
    if (!line.trim()) span.classList.add('blank');
    else span.textContent = line;
    textEl.appendChild(span);
    oathRevealTimer = setTimeout(revealNext, line.trim() ? INTERVAL_MS : INTERVAL_MS * 0.4);
  }
  revealNext();
}

async function enterOath() {
  if (oathActive) return;
  oathActive = true;
  _ambientLight.intensity = 0.04;
  _overheadLight.intensity = 0.0;
  oathSpot.intensity = 4.0;
  const overlay = document.getElementById('oath-overlay');
  const textEl = document.getElementById('oath-text');
  if (!overlay || !textEl) return;
  textEl.textContent = '';
  overlay.classList.add('visible');
  if (!oathLines.length) oathLines = await loadSoulMd();
  scheduleOathLines(oathLines, textEl);
}

function exitOath() {
  if (!oathActive) return;
  oathActive = false;
  if (oathRevealTimer !== null) { clearTimeout(oathRevealTimer); oathRevealTimer = null; }
  _ambientLight.intensity = AMBIENT_NORMAL;
  _overheadLight.intensity = OVERHEAD_NORMAL;
  oathSpot.intensity = 0;
  const overlay = document.getElementById('oath-overlay');
  if (overlay) overlay.classList.remove('visible');
}

export function init(scene, ambientLight, overheadLight, renderer, camera) {
  _ambientLight = ambientLight;
  _overheadLight = overheadLight;
  _renderer = renderer;
  _camera = camera;
  AMBIENT_NORMAL = ambientLight.intensity;
  OVERHEAD_NORMAL = overheadLight.intensity;

  tomeGroup = new THREE.Group();
  tomeGroup.position.set(0, 5.8, 0);
  tomeGroup.userData.zoomLabel = 'The Oath';
  const tomeCoverMat = new THREE.MeshStandardMaterial({ color: 0x2a1800, metalness: 0.15, roughness: 0.7, emissive: new THREE.Color(0xffd700).multiplyScalar(0.04) });
  const tomePagesMat = new THREE.MeshStandardMaterial({ color: 0xd8ceb0, roughness: 0.9, metalness: 0.0 });
  const tomeBody = new THREE.Mesh(new THREE.BoxGeometry(1.1, 0.1, 1.4), tomeCoverMat);
  tomeGroup.add(tomeBody);
  const tomePages = new THREE.Mesh(new THREE.BoxGeometry(1.0, 0.07, 1.28), tomePagesMat);
  tomePages.position.set(0.02, 0, 0);
  tomeGroup.add(tomePages);
  const tomeSpiMat = new THREE.MeshStandardMaterial({ color: 0xffd700, metalness: 0.6, roughness: 0.4 });
  const tomeSpine = new THREE.Mesh(new THREE.BoxGeometry(0.06, 0.12, 1.4), tomeSpiMat);
  tomeSpine.position.set(-0.52, 0, 0);
  tomeGroup.add(tomeSpine);
  tomeGroup.traverse(o => { if (o.isMesh) { o.userData.zoomLabel = 'The Oath'; o.castShadow = true; o.receiveShadow = true; } });
  scene.add(tomeGroup);

  tomeGlow = new THREE.PointLight(0xffd700, 0.4, 5);
  tomeGlow.position.set(0, 5.4, 0);
  scene.add(tomeGlow);

  oathSpot = new THREE.SpotLight(0xffd700, 0, 40, Math.PI / 7, 0.4, 1.2);
  oathSpot.position.set(0, 22, 0);
  oathSpot.target.position.set(0, 0, 0);
  oathSpot.castShadow = true;
  oathSpot.shadow.mapSize.set(1024, 1024);
  oathSpot.shadow.camera.near = 1;
  oathSpot.shadow.camera.far = 50;
  oathSpot.shadow.bias = -0.002;
  scene.add(oathSpot);
  scene.add(oathSpot.target);

  document.addEventListener('keydown', (e) => {
    if (e.key === 'o' || e.key === 'O') { if (oathActive) exitOath(); else enterOath(); }
    if (e.key === 'Escape' && oathActive) exitOath();
  });

  renderer.domElement.addEventListener('dblclick', (e) => {
    const mx = (e.clientX / window.innerWidth) * 2 - 1;
    const my = -(e.clientY / window.innerHeight) * 2 + 1;
    const tomeRay = new THREE.Raycaster();
    tomeRay.setFromCamera(new THREE.Vector2(mx, my), camera);
    const hits = tomeRay.intersectObjects(tomeGroup.children, true);
    if (hits.length) { if (oathActive) exitOath(); else enterOath(); }
  });

  loadSoulMd().then(lines => { oathLines = lines; });
}

export function update(elapsed) {
  tomeGroup.position.y = 5.8 + Math.sin(elapsed * 0.6) * 0.18;
  tomeGroup.rotation.y = elapsed * 0.3;
  tomeGlow.intensity = 0.3 + Math.sin(elapsed * 1.4) * 0.12;
  if (oathActive) oathSpot.intensity = 3.8 + Math.sin(elapsed * 0.9) * 0.4;
}