/*
 * red-letter.js — Words of Christ (red-letter) support. Isolated + additive.
 *
 * Loads the bundled verse-level dataset (red-letter.json, derived from the public-domain World
 * English Bible \wj markers), merges any user reference overrides, and toggles visibility via a
 * body class (body.red-letter-on) so on/off is instant with no re-render. The actual per-word
 * marking lives in app.js (window.applyRedLetterMarks), which this module re-invokes once the data
 * has loaded. Exposed on window.redLetter for the Settings page and (Phase 3) OSC.
 */
(function () {
  'use strict';

  var ENABLED_KEY = 'redLetterEnabled';   // 'true' | 'false' (default off)
  var OVERRIDES_KEY = 'redLetterOverrides'; // free text, one reference per line

  var BOOKS = ['Genesis','Exodus','Leviticus','Numbers','Deuteronomy','Joshua','Judges','Ruth',
    '1 Samuel','2 Samuel','1 Kings','2 Kings','1 Chronicles','2 Chronicles','Ezra','Nehemiah','Esther',
    'Job','Psalms','Proverbs','Ecclesiastes','Song of Solomon','Isaiah','Jeremiah','Lamentations',
    'Ezekiel','Daniel','Hosea','Joel','Amos','Obadiah','Jonah','Micah','Nahum','Habakkuk','Zephaniah',
    'Haggai','Zechariah','Malachi','Matthew','Mark','Luke','John','Acts','Romans','1 Corinthians',
    '2 Corinthians','Galatians','Ephesians','Philippians','Colossians','1 Thessalonians','2 Thessalonians',
    '1 Timothy','2 Timothy','Titus','Philemon','Hebrews','James','1 Peter','2 Peter','1 John','2 John',
    '3 John','Jude','Revelation'];

  function isEnabled() { try { return localStorage.getItem(ENABLED_KEY) === 'true'; } catch (_) { return false; } }
  function applyBodyClass() { try { document.body.classList.toggle('red-letter-on', isEnabled()); } catch (_) {} }

  function normalizeBook(name) {
    var n = String(name || '').trim().toLowerCase();
    for (var i = 0; i < BOOKS.length; i++) if (BOOKS[i].toLowerCase() === n) return BOOKS[i];
    // loose match (e.g. "song of songs", "psalm")
    if (n === 'song of songs') return 'Song of Solomon';
    if (n === 'psalm') return 'Psalms';
    return null;
  }

  // Merge user overrides ("John 3:16", "Matthew 5:3-12", one per line) into the dataset.
  function mergeOverrides(data) {
    var raw = '';
    try { raw = localStorage.getItem(OVERRIDES_KEY) || ''; } catch (_) {}
    if (!raw.trim()) return;
    raw.split(/\r?\n/).forEach(function (line) {
      line = line.trim();
      if (!line) return;
      var m = line.match(/^(.+?)\s+(\d+):(\d+)(?:\s*-\s*(\d+))?$/);
      if (!m) return;
      var book = normalizeBook(m[1]);
      if (!book) return;
      var chapter = m[2], vStart = parseInt(m[3], 10), vEnd = m[4] ? parseInt(m[4], 10) : vStart;
      if (!data[book]) data[book] = {};
      if (!Array.isArray(data[book][chapter])) data[book][chapter] = [];
      for (var v = vStart; v <= vEnd; v++) if (data[book][chapter].indexOf(v) === -1) data[book][chapter].push(v);
    });
  }

  function reapply() {
    try {
      var app = window.bibleApp;
      if (app && app.activeTabId != null && typeof window.applyRedLetterMarks === 'function') {
        window.applyRedLetterMarks(app.activeTabId);
      }
    } catch (_) {}
  }

  function load() {
    fetch('/red-letter.json', { cache: 'no-store' })
      .then(function (r) { return r.ok ? r.json() : null; })
      .then(function (data) {
        if (!data || typeof data !== 'object') return;
        try { mergeOverrides(data); } catch (_) {}
        window.__redLetterData = data;
        reapply(); // mark any already-rendered chapter now that data exists
      })
      .catch(function () { /* offline-safe: red-letter simply stays inactive */ });
  }

  // Public API (Settings + OSC)
  window.redLetter = {
    isEnabled: isEnabled,
    setEnabled: function (on) {
      try { localStorage.setItem(ENABLED_KEY, on ? 'true' : 'false'); } catch (_) {}
      applyBodyClass();
    },
    toggle: function () { window.redLetter.setEnabled(!isEnabled()); return isEnabled(); },
    // Re-read overrides + re-merge + re-mark (called after Settings saves references live, if ever)
    reloadData: function () { load(); }
  };

  function init() { applyBodyClass(); load(); }
  if (document.readyState !== 'loading') init();
  else document.addEventListener('DOMContentLoaded', init);
})();