ayi-cafe-mc/kubejs/server_scripts/src/custom_trades.js

const { $RandomSource } = require("packages/net/minecraft/util/$RandomSource");

// level 5 just eat feast for 5 emeralds
const feast_list = [
    'farmersdelight:rice_roll_medley_block',
    'farmersdelight:shepherds_pie_block',
    'farmersdelight:honey_glazed_ham_block',
    'farmersdelight:stuffed_pumpkin_block',
    'farmersdelight:roast_chicken_block',
    'farmersdelight:pasta_with_meatballs',
];

// level 4 helps you with block collection
const deco_list = [
    '32x minecraft:diorite',
    '32x minecraft:granite',
    '32x minecraft:andesite',
    '32x minecraft:stone',
    '32x minecraft:mossy_cobblestone',
    '32x minecraft:tuff',
    '32x minecraft:dirt',
    '32x minecraft:gravel',
    '32x minecraft:sand',
    '32x minecraft:mud',
    '32x minecraft:mud_bricks',
    '32x minecraft:stone_bricks',
    '32x minecraft:cobbled_deepslate',
];

// level 3 sells enchantment books for random gem
const enchantment_list = {
    armorer: ['projectile_protection', 'blast_protection'],
    butcher: ['sharpness', 'sweeping'],
    cartographer: ['looting', 'fortune'],
    cleric: ['fire_aspect', 'fire_protection', 'flame'],
    farmer: ['efficiency', 'thorns'],
    fisherman: ['lure', 'luck_of_the_sea'],
    fletcher: ['power', 'punch', 'quick_charge', 'piercing'],
    leatherworker: ['feather_falling', 'depth_strider'],
    librarian: ['smite', 'bane_of_arthropods'],
    mason: ['protection', 'unbreaking'],
    shepherd: ['knockback', 'aqua_affinity'],
    toolsmith: ['silk_touch', 'fortune'],
    weaponsmith: ['sharpness', 'fire_aspect'],
    delightchef: ['flame', 'fire_aspect'],
    delightcook: ['flame', 'fire_aspect'],
    carpenter: ['knockback', 'fortune'],
};

// level 2 villagers sell consumables for 2 emerald
const consumables = {
  // chainmail / gold armor pieces
  armorer: [
    'chainmail_helmet', 'chainmail_chestplate', 'chainmail_leggings', 'chainmail_boots',
    'golden_helmet', 'golden_chestplate', 'golden_leggings', 'golden_boots'
  ],
  // raw meat, bones, leather
  butcher: ['3x beef', '3x porkchop', '3x mutton', '3x environmental:vension', '4x chicken',
    '4x environmental:duck', '6x rabbit', '5x bone'],
  // explorer maps
  cartographer: [],
  // torches, saltpeter, lanterns, salt, sulfur, spider eyes, rotten flesh
  cleric: ['32x torch', '16x lantern', '16x spelunkery:salt', '16x spelunkery:saltpeter'],
  // bonemeal, seed, hoe, organic_compost
  farmer: ['6x bone_meal', '2x farmersdelight:organic_compost', '24x farmersdelight:straw', '18x supplementaries:flax'],
  // fish bones, leech, worm, fishing rod, treasure boxes
  fisherman: ['2x aquaculture:fish_bones', '3x aquaculture:leech', '5x aquaculture:worm', '8x aquaculture:box',
    '5x aquaculture:lockbox', '2x aquaculture:treasure_chest'],
  // various potion arrows, bows, crossbows
  fletcher: ['bow', 'bow', 'bow', 'crossbow', 'crowssbow'],
  // leather armor, bedrolls
  leatherworker: ['leather_helmet', 'leather_chestplate', 'leather_leggings', 'leather_boots'],
  // various dyes
  librarian: ['5x black_dye', '5x blue_dye', '5x brown_dye', '5x cyan_dye',
  '5x gray_dye', '5x green_dye', '5x light_blue_dye', '5x light_gray_dye',
  '5x lime_dye', '5x magenta_dye', '5x orange_dye', '5x pink_dye',
  '5x purple_dye', '5x red_dye', '5x yellow_dye', '5x white_dye'],
  // brick, concrete, terracotta
  mason: ['12x brick', '12x supplementaries:ash_brick', '12x terracotta', '24x concrete'],
  // wool, eggs, milk, honey, slime ball
  shepherd: ['3x white_wool', '8x environmental:duck_egg', '8x autumnity:turkey_egg', '4x environmental:yak_hair'],
  // shovel, pick
  toolsmith: ['iron_shovel', 'iron_pickaxe', 'golden_shovel', 'golden_pickaxe'],
  // sword, axe
  weaponsmith: ['iron_sword', 'iron_axe', 'golden_sword', 'golden_axe'],
  // rice, spaghetti, dough, crust
  delightchef: ['8x farmersdelight:rice', '10x farmersdelight:raw_pasta', '10x farmersdelight:crust', '16x sugar'],
  // cut raw meat
  delightcook: ['16x bowl', '16x glass_bottle', '1x bucket', '8x farmersdelight:minced_beef', '8x farmersdelight:bacon'],
  // planks
  carpenter: ['32x oak_planks', '32x spruce_planks', '32x birch_planks', '32x jungle_planks', '32x pine_planks', '32x bamboo_planks',
  '32x cherry_planks'],
};

const enchant_consumables = {
    armorer: 1,
    fletcher: 1,
    leatherworker: 2,
    toolsmith: 3,
    weaponsmith: 2
};

// level 1 villagers buy food for 1 emerald
const food_list = [
    '8x minecraft:apple',
    '8x minecraft:beetroot',
    '8x minecraft:baked_potato',
    '8x minecraft:bread',
    '8x minecraft:carrot',
    '8x minecraft:melon_slice',
    '8x minecraft:sweet_berries',
    
    '8x farmersdelight:pumpkin_slice',
    '8x farmersdelight:cabbage_leaf',
    '8x farmersdelight:tomato',
    '8x farmersdelight:cooked_rice',
    '8x farmersdelight:fried_egg',
    
    '8x neapolitan:strawberries',
    '8x neapolitan:banana',
    '8x neapolitan:dried_banana',
    '8x neapolitan:roasted_adzuki_beans',
    '8x neapolitan:mint_candies',
    
    '8x atmospheric:passion_fruit',
    '8x atmospheric:currant',
    '8x atmospheric:dragon_fruit',
    '8x atmospheric:candied_orange_slices',
    '8x atmospheric:roasted_yucca_fruit',
];


/**
 * @param {string[]} list
 * @param {$RandomSource} random 
 * @returns {string}
 */
function roll(list, random){
    if (list == null) throw new Error("list not valid...");
    return list[Math.floor(random.nextFloat() * list.length)];
}

/**
 * @param {string[]} ids
 * @param {string[]} enchant_pool 
 * @param {number} enchant_rolls 
 * @param {$RandomSource} random
 * @param {boolean} damage
 */
function genEnchanted(ids, enchant_pool, enchant_rolls, random, damage ){
  const id = roll(ids, random);
  const item = Item.of(id);

  if(damage) {
      const dmg = Math.floor(item.maxDamage * (0.2 + 0.1 * random.nextFloat()));
      item.setDamageValue(dmg);
  }

  /** @type {Record<string, number>} */
  const enchantments = {};

  for(let i = 0; i < enchant_rolls; i ++){
    const enchant = roll(enchant_pool, random);
    enchantments[enchant] = (enchantments[enchant] || 0) + 1;
  }

  for(const [enchant, level] of Object.entries(enchantments)){
    item.enchant(enchant, level);
  }

  return item;
}

const gems = [
    'diamond',
    '2x gold_ingot',
    '3x caverns_and_chasms:spinel',
    '4x spelunkery:cinnabar',
    '5x lapis_lazuli',
    '6x amethyst_shard',
];

MoreJSEvents.villagerTrades((event) => {
    event.removeVanillaTrades();
    event.removeModdedTrades();
    const professions = VillagerUtils.getProfessions();
    professions.forEach(prof => {
        const profName = prof.name();
        if(profName === 'nitwit') return;
        const rolls = enchant_consumables[profName] || 0;
        const enchantments = enchantment_list[profName];
        const staples = consumables[profName];
        if(!enchantments) throw new Error("No enchantments for " + profName);
        if(!staples) throw new Error("No staples for " + profName);
        // 1 level 5 trade
        event.addCustomTrade(prof, 5, (offer, entity, random) => {
            offer.setFirstInput(roll(feast_list, random));
            offer.setOutput('5x emerald');
            offer.setMaxUses(1);
            offer.setVillagerExperience(1);
            offer.setPriceMultiplier(1);
        });
        // 2 for the rest
        for(let i = 0; i < 2; i ++) {
            // level 4
            event.addCustomTrade(prof, 4, (offer, entity, random) => {
                offer.setFirstInput('3x emerald');
                offer.setOutput(roll(deco_list, random));
                offer.setMaxUses(4);
                offer.setVillagerExperience(1);
                offer.setPriceMultiplier(1);
            });
            // level 3
            event.addCustomTrade(prof, 3, (offer, entity, random) => {
                offer.setFirstInput(roll(gems, random));
                offer.setSecondInput('8x emerald');
                offer.setOutput(genEnchanted(['enchanted_book'], enchantments, rolls+1, random, false));
                offer.setMaxUses(1);
                offer.setVillagerExperience(1);
                offer.setPriceMultiplier(1);
            });
            // level 2
            event.addCustomTrade(prof, 2, (offer, entity, random) => {
                offer.setFirstInput('2x emerald');
                if(rolls > 0) offer.setOutput(genEnchanted(staples, enchantments, rolls, random, true));
                else offer.setOutput(roll(staples, random));
                offer.setMaxUses(1);
                offer.setVillagerExperience(1);
                offer.setPriceMultiplier(1);
            });
            // level 1
            event.addCustomTrade(prof, 1, (offer, entity, random) => { 
                offer.setFirstInput(roll(food_list, random));
                offer.setOutput('1x emerald');
                offer.setMaxUses(1);
                offer.setVillagerExperience(5);
                offer.setPriceMultiplier(1);
            });
        }
    });
});