advanced_npc/trade/prices.lua

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-- Price table for items bought/sold by NPC traders by Zorman2000
-- This table should be globally accessible so that other mods can set
-- prices as they see fit.
npc.trade.prices = {}
-- Define default currency (based on lumps from default)
npc.trade.prices.currency = {
tier1 = {string = "default:gold_lump", name = "Gold lump"},
tier2 = {string = "default:copper_lump", name = "Copper lump"},
tier3 = {string = "default:iron_lump", name = "Iron lump"}
}
-- TODO: Set the currency depending on available mods
-- Table that contains the prices
npc.trade.prices.table = {}
-- Default definitions for in-game items
-- Tier 3 items: cheap items
npc.trade.prices.table["default:cobble"] = {tier = npc.trade.prices.currency.tier3.string, count = 0.1}
npc.trade.prices.table["flowers:geranium"] = {tier = npc.trade.prices.currency.tier3.string, count = 0.5}
npc.trade.prices.table["default:apple"] = {tier = npc.trade.prices.currency.tier3.string, count = 1}
npc.trade.prices.table["default:tree"] = {tier = npc.trade.prices.currency.tier3.string, count = 2}
npc.trade.prices.table["flowers:rose"] = {tier = npc.trade.prices.currency.tier3.string, count = 2}
npc.trade.prices.table["default:stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 2}
npc.trade.prices.table["farming:seed_cotton"] = {tier = npc.trade.prices.currency.tier3.string, count = 3}
npc.trade.prices.table["farming:seed_wheat"] = {tier = npc.trade.prices.currency.tier3.string, count = 3}
npc.trade.prices.table["default:clay_lump"] = {tier = npc.trade.prices.currency.tier3.string, count = 3}
npc.trade.prices.table["default:wood"] = {tier = npc.trade.prices.currency.tier3.string, count = 3}
npc.trade.prices.table["mobs:meat_raw"] = {tier = npc.trade.prices.currency.tier3.string, count = 4}
npc.trade.prices.table["default:sapling"] = {tier = npc.trade.prices.currency.tier3.string, count = 5}
npc.trade.prices.table["mobs:meat"] = {tier = npc.trade.prices.currency.tier3.string, count = 5}
npc.trade.prices.table["mobs:leather"] = {tier = npc.trade.prices.currency.tier3.string, count = 6}
npc.trade.prices.table["default:sword_stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 6}
npc.trade.prices.table["default:shovel_stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 6}
npc.trade.prices.table["default:axe_stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 6}
npc.trade.prices.table["default:hoe_stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 6}
npc.trade.prices.table["default:pick_stone"] = {tier = npc.trade.prices.currency.tier3.string, count = 7}
npc.trade.prices.table["farming:cotton"] = {tier = npc.trade.prices.currency.tier3.string, count = 15}
npc.trade.prices.table["farming:bread"] = {tier = npc.trade.prices.currency.tier3.string, count = 20}
-- Tier 2 items: medium priced items
-- Tier 1 items: expensive items
npc.trade.prices.table["default:diamond"] = {tier = npc.trade.prices.currency.tier1.string, count = 90}
npc.trade.prices.table["advanced_npc:marriage_ring"] = {tier = npc.trade.prices.currency.tier1.string, count = 100}
-- Functions
function npc.trade.prices.update(item_name, price)
for key,value in pairs(npc.trade.prices.table) do
if key == item_name then
value = price
return
end
end
return nil
end
function npc.trade.prices.get(item_name)
for key,value in pairs(npc.trade.prices.table) do
if key == item_name then
return {item_name = key, price = value}
end
end
return nil
end
function npc.trade.prices.add(item_name, price)
if npc.trade.prices.get(item_name) == nil then
npc.trade.prices.table[item_name] = price
else
npc.trade.prices.update(item_name, price)
end
end
function npc.trade.prices.remove(item_name)
npc.trade.prices.table[item_name] = nil
end
-- Gets all the item for a specified budget
function npc.trade.prices.get_items_for_currency_count(tier, count, price_factor)
local result = {}
minetest.log("Currency quantity: "..dump(count))
for item_name, price in pairs(npc.trade.prices.table) do
-- Check price currency is of the same tier
if price.tier == tier and price.count <= count then
result[item_name] = {price = price}
minetest.log("Item name: "..dump(item_name)..", Price: "..dump(price))
local min_buying_item_count = 1
-- Calculate price NPC is going to buy for
local buying_price_count = price.count * price_factor
-- Check if the buying price is not an integer
if buying_price_count % 1 ~= 0 then
-- If not, increase the buying item count until we get an integer
local adjust = 1 / price_factor
if price.count < 1 then
adjust = 1 / (price.count * price_factor)
end
min_buying_item_count = min_buying_item_count * adjust
end
--minetest.log("Minimum item buy quantity: "..dump(min_buying_item_count))
--minetest.log("Minimum item price quantity: "..dump(buying_price_count))
-- Calculate maximum buyable quantity
local max_buying_item_count = min_buying_item_count
while ((max_buying_item_count + min_buying_item_count) * buying_price_count <= count) do
max_buying_item_count = max_buying_item_count + min_buying_item_count
end
--minetest.log("Maximum item buy quantity: "..dump(max_buying_item_count))
result[item_name].min_buyable_item_count = min_buying_item_count
result[item_name].min_buyable_item_price = min_buying_item_count * buying_price_count
result[item_name].max_buyable_item_count = max_buying_item_count
end
end
--minetest.log("Final result: "..dump(result))
return result
end
-- This methods will compare the given item string to the
-- currencies set in the currencies table. Returns true if
-- itemstring is a currency.
function npc.trade.prices.is_item_currency(itemstring)
if npc.get_item_name(itemstring) == npc.trade.prices.currency.tier3.string
or npc.get_item_name(itemstring) == npc.trade.prices.currency.tier2.string
or npc.get_item_name(itemstring) == npc.trade.prices.currency.tier1.string then
return true
end
return false
end