how to add random attributes to curio items? (1.20.1)

[cold haven]

I am confused on how to make this code work

const CuriosApi = java('top.theillusivec4.curios.api.CuriosApi');

// Function to generate a random ID
function random_id() {
return Math.floor(Math.random() * 10000000);
}

// Function to determine item quality based on smithing skill
function determine_type(event) {
const types = ['terrible', 'poor', 'bad', 'normal', 'good', 'amazing', 'legendary'];
const v = [1, 3, 5, 7, 9, 12, 15];
const vals = [-3, -2, 1, 0, 1, 2, 3];

const smithing_skill = global.get_level(event.player, 'smithing');
var goal = Math.floor(Math.random() * smithing_skill);

var closest = v.reduce((prev, curr) => {
    return (Math.abs(curr - goal) < Math.abs(prev - goal) ? curr : prev);
});

for (let i = 0; i < v.length; i++) {
    if (v[i] == closest) {
        return [types[i], vals[i]];
    }
}

}

// Event when a player equips a curio
onEvent('player.inventory.changed', (event) => {
const player = event.player;
const equipped = CuriosApi.getCuriosHelper().getEquippedCurios(player.minecraftPlayer).resolve().get();

for (let i = 0; i < equipped.getSlots(); i++) {
    let itemStack = equipped.getStackInSlot(i);
    
    if (!itemStack.isEmpty()) {
        let item = Item.of(itemStack);
        let typeData = determine_type(event);
        let type = typeData[0];
        let value = typeData[1];

        // Apply attribute as NBT data to the item
        let nbt = item.nbt || {};
        nbt.customQuality = {
            id: random_id(),
            type: type,
            value: value
        };
        item.nbt = nbt;

        player.tell(`Your ${item.getDisplayName()} has been assigned a quality: ${type} (${value})`);
    }
}

});

[raw echo]

Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

[tacit herald]

You can write your code in a codeblock by typing it between the codeblock delimiters:
Note that these are backticks, not apostrophes

```js :arrow_left:

ServerEvents.recipes(event => {
event.smelting('minecraft:glass', '#forge:sand').xp(.1)
})

``` :arrow_left:

This example will look like this:

ServerEvents.recipes(event => {
  event.smelting('minecraft:glass', '#forge:sand').xp(.1)
})