/**
 * main.js
 * Module entry point for NPC Quick Card Deck.
 *
 * Load order:
 *  1. Hooks.once("init")  — register Handlebars helpers before any template renders
 *  2. Hooks.once("ready") — create the singleton deck, register token hooks,
 *                           and inject the toolbar button into the Actor Directory
 */

import { NPCCardDeck } from "./card-deck.js";
import { registerTokenHooks } from "./token-hooks.js";

// ── init ───────────────────────────────────────────────────────────────────────
Hooks.once("init", () => {
  console.log("NPC Quick Cards | Initialising");

  // Register Handlebars helpers.
  // `eq` is built-in from Foundry v10 onward but we register defensively
  // in case a stripped-down environment doesn't have it.
  if (!Handlebars.helpers["eq"]) {
    Handlebars.registerHelper("eq", (a, b) => a === b);
  }

  // Useful for attitude slider label comparisons in templates
  Handlebars.registerHelper("nqc-gt", (a, b) => Number(a) > Number(b));
  Handlebars.registerHelper("nqc-lt", (a, b) => Number(a) < Number(b));

  // Pre-load templates so they are cached before the deck first opens.
  // v13 moved loadTemplates under foundry.applications.handlebars; fall back
  // to the global for v12 compatibility.
  const _loadTemplates =
    foundry.applications?.handlebars?.loadTemplates?.bind(foundry.applications.handlebars)
    ?? globalThis.loadTemplates;
  _loadTemplates([
    "modules/npc-quick-cards/templates/card-deck.hbs",
    "modules/npc-quick-cards/templates/npc-card.hbs",
    "modules/npc-quick-cards/templates/card-tooltip.hbs",
  ]);
});

// ── ready ──────────────────────────────────────────────────────────────────────
Hooks.once("ready", () => {
  // Only the GM needs the deck; bail out for players
  if (!game.user.isGM) return;

  // Create singleton and expose on game so macros can call game.npcCardDeck.toggle()
  game.npcCardDeck = new NPCCardDeck();

  // Register canvas token interaction hooks
  registerTokenHooks(game.npcCardDeck);

  console.log("NPC Quick Cards | Ready");
});

// ── Actor Directory toolbar button ─────────────────────────────────────────────
// Injected here (outside "ready") so it re-fires every time the directory re-renders.
//
// Foundry v13 passes a plain HTMLElement as the second argument; v12 passed a
// jQuery object.  We normalise to a plain element so the same code works on both.
// We also try every known selector for the header actions area across v12 / v13
// because the DOM structure changed between versions.
Hooks.on("renderActorDirectory", (_app, html) => {
  if (!game.user?.isGM)  return;
  if (!game.npcCardDeck) return;

  // Resolve to a plain HTMLElement regardless of Foundry version
  const root = (html instanceof HTMLElement) ? html : (html[0] ?? html);
  if (!(root instanceof HTMLElement)) return;

  if (root.querySelector(".npc-deck-toggle")) return; // prevent duplicates

  const btn = document.createElement("button");
  btn.type      = "button";
  btn.className = "npc-deck-toggle";
  btn.title     = "NPC Quick Card Deck";
  btn.innerHTML = '<i class="fas fa-address-card"></i> NPC Deck';
  btn.addEventListener("click", () => game.npcCardDeck.toggle());

  // Try every known header-action selector across Foundry v12 and v13.
  // Log which one we find so the console makes it easy to debug.
  const SELECTORS = [
    ".directory-header .header-actions",   // v12 standard
    ".directory-header .action-buttons",   // v13 variant
    "header .header-actions",              // v13 <header> element
    "header .action-buttons",             // v13 variant
    ".header-actions",                     // any version, loose
    ".action-buttons",                     // any version, loose
    ".directory-header",                   // fallback: whole header
    "header",                              // fallback: <header> element
  ];

  let target = null;
  for (const sel of SELECTORS) {
    target = root.querySelector(sel);
    if (target) {
      console.log(`NPC Quick Cards | Injecting button into "${sel}"`);
      break;
    }
  }

  if (target) {
    target.prepend(btn);
  } else {
    // Absolute last resort — prepend directly to the directory root
    console.warn("NPC Quick Cards | Could not find a header target; prepending to root.");
    root.prepend(btn);
  }
});