Manuel Simon Hirsig
132 lines
3.7 KiB
Lua
132 lines
3.7 KiB
Lua
aux.module 'history'
|
|
|
|
local history_schema = {'record', '#', {next_push='number'}, {daily_min_buyout='number'}, {daily_max_price='number'}, {data_points={'list', ';', {'record', '@', {market_value='number'}, {time='number'}}}}}
|
|
value_cache = {}
|
|
|
|
function next_push()
|
|
local date = date('*t')
|
|
date.hour, date.min, date.sec = 24, 0, 0
|
|
return time(date)
|
|
end
|
|
|
|
function new_record()
|
|
return { next_push = next_push(), data_points = {} }
|
|
end
|
|
|
|
function load_data()
|
|
local dataset = persistence.load_dataset()
|
|
dataset.history = dataset.history or {}
|
|
return dataset.history
|
|
end
|
|
|
|
function read_record(item_key)
|
|
local data = load_data()
|
|
|
|
local record
|
|
if data[item_key] then
|
|
record = persistence.read(history_schema, data[item_key])
|
|
else
|
|
record = new_record()
|
|
end
|
|
|
|
if record.next_push <= time() then
|
|
push_record(record)
|
|
write_record(item_key, record)
|
|
end
|
|
|
|
return record
|
|
end
|
|
|
|
function write_record(item_key, record)
|
|
value_cache[item_key] = nil
|
|
local data = load_data()
|
|
data[item_key] = persistence.write(history_schema, record)
|
|
end
|
|
|
|
function public.process_auction(auction_record)
|
|
local item_record = read_record(auction_record.item_key)
|
|
|
|
local unit_bid_price = ceil(auction_record.bid_price / auction_record.aux_quantity)
|
|
local unit_buyout_price = ceil(auction_record.buyout_price / auction_record.aux_quantity)
|
|
|
|
if auction_record.buyout_price > 0 then
|
|
item_record.daily_min_buyout = item_record.daily_min_buyout and min(item_record.daily_min_buyout, unit_buyout_price) or unit_buyout_price
|
|
end
|
|
|
|
item_record.daily_max_price = max(item_record.daily_max_price or 0, unit_buyout_price, unit_bid_price)
|
|
|
|
write_record(auction_record.item_key, item_record)
|
|
end
|
|
|
|
function public.price_data(item_key)
|
|
local item_record = read_record(item_key)
|
|
return item_record.daily_min_buyout, item_record.daily_max_price, item_record.data_points
|
|
end
|
|
|
|
function public.value(item_key)
|
|
if not value_cache[item_key] or value_cache[item_key].next_push <= time() then
|
|
local item_record = read_record(item_key)
|
|
|
|
local value
|
|
if getn(item_record.data_points) > 0 then
|
|
local weighted_values = {}
|
|
local total_weight = 0
|
|
for _, data_point in item_record.data_points do
|
|
local weight = 0.99^round((item_record.data_points[1].time - data_point.time) / (60*60*24))
|
|
total_weight = total_weight + weight
|
|
tinsert(weighted_values, {value = data_point.market_value, weight = weight})
|
|
end
|
|
for _, weighted_value in weighted_values do
|
|
weighted_value.weight = weighted_value.weight / total_weight
|
|
end
|
|
|
|
value = weighted_median(weighted_values)
|
|
else
|
|
value = calculate_market_value(item_record)
|
|
end
|
|
|
|
value_cache[item_key] = {value=value, next_push=item_record.next_push}
|
|
end
|
|
|
|
return value_cache[item_key].value
|
|
end
|
|
|
|
function public.market_value(item_key)
|
|
local item_record = read_record(item_key)
|
|
return calculate_market_value(item_record)
|
|
end
|
|
|
|
function calculate_market_value(item_record)
|
|
return item_record.daily_min_buyout and min(ceil(item_record.daily_min_buyout * 1.15), item_record.daily_max_price)
|
|
end
|
|
|
|
function weighted_median(list)
|
|
local sorted_list = {}
|
|
for _, e in list do
|
|
tinsert(sorted_list, e)
|
|
end
|
|
sort(sorted_list, function(a,b) return a.value < b.value end)
|
|
|
|
local weight = 0
|
|
for _, element in sorted_list do
|
|
weight = weight + element.weight
|
|
if weight >= 0.5 then
|
|
return element.value
|
|
end
|
|
end
|
|
end
|
|
|
|
function push_record(item_record)
|
|
|
|
local market_value = calculate_market_value(item_record)
|
|
if market_value then
|
|
tinsert(item_record.data_points, 1, { market_value = market_value, time = item_record.next_push })
|
|
while getn(item_record.data_points) > 11 do
|
|
tremove(item_record.data_points)
|
|
end
|
|
end
|
|
|
|
item_record.daily_min_buyout = nil
|
|
item_record.daily_max_price = nil
|
|
item_record.next_push = next_push()
|
|
end |