export async function executeCastSpellAction(action, context) {
  const token = resolveCasterToken(action, context);
  const actor = token?.actor;
  if (!actor) return { success: false, consumed: false, reason: "NO_CASTER" };

  const item = await resolveItem(actor, action.spellSelection);
  if (!item) return { success: false, consumed: false, reason: "NO_SPELL_ITEM" };

  if (action.activationMode === "autoUse" && typeof item.use === "function") {
    await item.use({}, { configureDialog: true });
    return { success: true, consumed: true };
  }

  item.sheet?.render(true);
  ui.notifications.info(`${item.name} wurde für ${actor.name} geöffnet. Der Zauber wird aus dem Inventar des Characters über dessen Spellslots genutzt.`);

  return { success: true, consumed: true };
}

function resolveCasterToken(action, context) {
  switch (action.casterMode ?? "affectedToken") {
    case "sourceToken": return context.sourceToken ?? null;
    case "assignedToken": return context.assignedToken ?? context.targetToken ?? null;
    case "affectedToken":
    default: return context.targetToken ?? context.tokenDocument?.object ?? null;
  }
}

async function resolveItem(actor, selection = {}) {
  if (selection.mode === "itemUuid" && selection.itemUuid) {
    const item = await fromUuid(selection.itemUuid);
    return item?.type === "spell" ? item : null;
  }

  if (selection.mode === "itemName" && selection.itemName) {
    const expected = selection.itemName.toLocaleLowerCase();
    return actor.items.find(item => item.type === "spell" && item.name.toLocaleLowerCase() === expected) ?? null;
  }

  return null;
}