Manuel Simon Hirsig
122 lines
3.8 KiB
Lua
122 lines
3.8 KiB
Lua
aux 'history' private() local persistence = aux.persistence
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local history_schema = {'record', '#', {next_push='number'}, {daily_min_buyout='number'}, {daily_max_price='number'}, {data_points={'list', ';', {'record', '@', {market_value='number'}, {time='number'}}}} }
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value_cache = t
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do
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local cache
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function private.data.get()
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if not cache then
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local dataset = persistence.dataset
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cache = dataset.history or t
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dataset.history = cache
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end
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return cache
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end
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end
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do
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local cache = 0
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function private.next_push.get()
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if time() > cache then
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local date = date('*t')
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date.hour, date.min, date.sec = 24, 0, 0
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cache = time(date)
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end
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return cache
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end
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end
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function private.new_record.get()
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return T('next_push', next_push, 'data_points', t)
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end
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function read_record(item_key)
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local record = data[item_key] and persistence.read(history_schema, data[item_key]) or new_record
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if record.next_push <= time() then
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push_record(record)
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write_record(item_key, record)
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end
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return record
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end
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function write_record(item_key, record)
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value_cache[item_key] = nil
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data[item_key] = persistence.write(history_schema, record)
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end
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function public.process_auction(auction_record)
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local item_record = read_record(auction_record.item_key)
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local unit_bid_price = ceil(auction_record.bid_price / auction_record.aux_quantity)
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local unit_buyout_price = ceil(auction_record.buyout_price / auction_record.aux_quantity)
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local max_unit_price = max(unit_buyout_price, unit_bid_price)
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local changed
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if unit_buyout_price > 0 and unit_buyout_price < (item_record.daily_min_buyout or huge) then
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item_record.daily_min_buyout = unit_buyout_price
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changed = true
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end
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if max_unit_price > (item_record.daily_max_price or 0) then
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item_record.daily_max_price = max_unit_price
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changed = true
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end
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if not changed then return end
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write_record(auction_record.item_key, item_record)
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end
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function public.price_data(item_key)
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local item_record = read_record(item_key)
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return item_record.daily_min_buyout, item_record.daily_max_price, item_record.data_points
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end
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function public.value(item_key)
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if not value_cache[item_key] or value_cache[item_key].next_push <= time() then
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local item_record, value
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item_record = read_record(item_key)
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if getn(item_record.data_points) > 0 then
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local total_weight, weighted_values = 0, tt
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for _, data_point in item_record.data_points do
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local weight = .99 ^ round((item_record.data_points[1].time - data_point.time) / (60 * 60 * 24))
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total_weight = total_weight + weight
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tinsert(weighted_values, T('value', data_point.market_value, 'weight', weight))
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end
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for _, weighted_value in weighted_values do
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weighted_value.weight = weighted_value.weight / total_weight
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end
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value = weighted_median(weighted_values)
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else
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value = calculate_market_value(item_record)
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end
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value_cache[item_key] = T('value', value, 'next_push', item_record.next_push)
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end
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return value_cache[item_key].value
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end
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function public.market_value(item_key)
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return calculate_market_value(read_record(item_key))
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end
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function calculate_market_value(item_record)
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return item_record.daily_min_buyout and min(ceil(item_record.daily_min_buyout * 1.15), item_record.daily_max_price)
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end
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function weighted_median(list)
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sort(list, function(a,b) return a.value < b.value end)
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local weight = 0
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for _, element in list do
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weight = weight + element.weight
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if weight >= .5 then
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return element.value
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end
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end
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end
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function push_record(item_record)
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for market_value in present(calculate_market_value(item_record)) do
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tinsert(item_record.data_points, 1, T('market_value', market_value, 'time', item_record.next_push))
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while getn(item_record.data_points) > 11 do
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tremove(item_record.data_points)
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end
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end
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item_record.next_push, item_record.daily_min_buyout, item_record.daily_max_price = next_push, nil, nil
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end |