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Module:Exchange

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--[[
{{Helper module|name=Exchange
|fname1=_price(arg)
|ftype1=String
|fuse1=Gets the current median price of item named arg
|fname2=_value(arg)
|ftype2=String
|fuse2=Gets the value of item named arg
}}
--]]
-- <pre>
--
-- Implements various exchange templates
-- See Individual method docs for more details
--
-- See also:
-- - [[Module:ExchangeData]]
-- - [[Module:ExchangeDefault]]
-- 
-- Original version: http://runescape.wikia.com/wiki/Module:Exchange
 
local p = {}
 
-- only load commonly used modules here
local yesno = require( 'Module:Yesno' )
local addcommas = require( 'Module:Addcommas' )._add
 
-- map redirects to their correct pages
local geRedirects = {
    ['1/2 anchovy pizza'] = '½ anchovy pizza',
    ['1/2 meat pizza'] = '½ meat pizza',
    ["1/2 p'apple pizza"] = "½ p'apple pizza",
    ['1/2 plain pizza'] = '½ plain pizza',
    ['1/3 evil turnip'] = '⅓ evil turnip',
    ['2/3 cake'] = '⅔ cake',
    ['2/3 chocolate cake'] = '⅔ chocolate cake',
    ['2/3 evil turnip'] = '⅔ evil turnip'
}
 
--
-- Makes sure first letter of item is uppercase
-- Automatically handles any redirects
--
local function checkTitle( item )
    -- upper case first letter to make sure we can find a valid item page
    item = mw.text.split( item, '' )
    item[1] = mw.ustring.upper( item[1] )
    item = table.concat( item )
 
    -- automatically handle redirects
    if geRedirects[item] ~= nil then
        item = geRedirects[item]
    end
 
    return item
end
--
-- Simple mw.loadData wrapper used to access data located on module subpages
--
-- @param item {string} Item to retrieve data for
-- @return {table} Table of item data
--
local function load( item )
    item = checkTitle( item )
    local noErr, ret = pcall( mw.loadData, 'Module:Exchange/' .. item )
 
    if noErr then
        return ret
    end
 
    error( ret )
end
 
--
-- Returns the price of an item
--
-- @param item {string} Item to get current price of
-- @param multi {number} (optional) Multiplies the output price by the specified number
-- @param format {boolean} (optional) Format the result with commas (defaults to false)
-- @param round {number} (optional) Round the result to a number of decimal places
-- @return {number|string} Price of item. Will return a string if formatted, else a number.
--
function p._price( item, multi, format, round )
    local price = load( item ).price
    local multi = type( multi ) == 'number' and multi or 1
    local format = type( format ) == 'boolean' and format or false
    local ret = price * multi
 
    -- round the number to X d.p.
    if round ~= nil then
        local multi = 10^( round )
        ret = math.floor( ret * multi + 0.5 ) / multi
    end
 
    if format then
        return addcommas( ret )
    end
 
    return ret
end
 
--
-- Returns the limit of an item
--
-- @param item {string} Item to get the limit of
-- @return {number} Limit of item
--
function p._limit( item )
    return load( item ).limit
end
 
--
-- Returns the value of an item
--
-- @param item {string} Item to get the value or
-- @return {number} Value of item
--
function p._value( item )
    return load( item ).value
end
 
--
-- Calculates the difference between the current price and the last price of an item
--
-- @param item {string} Item to calculate price difference for
-- @param format {boolean} `true` if the output is to be formatted with commas
--                         Defaults to `false`
-- @return {number|string} The price difference as a number
--                         If `format` is set to `true` then this returns a string
--                         If either of the prices to calculate the diff from are unavailable, this returns `0` (number)
--
function p._diff( item, format )
    local data = load( item )
    local diff = 0
 
    if data.price and data.last then
        diff = data.price - data.last
 
        if format then
            diff = addcommas( diff )
        end
    end
 
    return diff
end
 
--
-- {{GEItem}} internal method
--
-- @todo merge into p.table
--
-- @param item {string} Item to get data for
-- @return {string}
--
function p._table( item )
    -- load data and any required modules
    local item = checkTitle( item )
    local data = load( item )
    local timeago = require( 'Module:TimeAgo' )._ago
    local changeperday = require( 'Module:ChangePerDay' )._change
 
    -- set variables here to make the row building easier to follow
    local div = '<i>Unknown</i>'
    local limit = data.limit and addcommas( data.limit ) or '<i>Unknown</i>'
    local members = '<i>Unknown</i>'
 
    if data.last then
        local link = 'http://services.runescape.com/m=itemdb_oldschool/viewitem.ws?obj=' .. data.itemId
        local change = math.abs( changeperday( {data.price, data.last, data.date, data.lastDate} ) )
 
        if data.price > data.last then
            arrow = '[[File:Up.png|20px|link=' .. link .. ']]'
        elseif data.price < data.last then
            arrow = '[[File:Down.png|20px|link=' .. link .. ']]'
        else
            arrow = '[[File:Unchg.png|40px|link=' .. link .. ']]'
        end
 
        if change >= 0.04 then
            arrow = arrow  .. arrow .. arrow
        elseif change >= 0.02 then
            arrow = arrow .. arrow
        end
 
        div = mw.html.create( 'div' )
            :css( 'white-space', 'nowrap' )
            :wikitext( arrow )
 
        div = tostring( div )
    end
 
    if data.members == true then
        members = '[[File:P2P icon.png|30px|link=Members]]'
    elseif data.members == false then
        members = '[[File:F2P icon.png|30px|link=Free-to-play]]'
    end
 
    -- build table row
    local tr = mw.html.create( 'tr' )
        :tag( 'td' )
            :wikitext( '[[File:' .. item .. '.png|' .. item .. ']]' )
            :done()
        :tag( 'td' )
            :css( {
                ['width'] = '15%',
                ['text-align'] = 'left'
            } )
            :wikitext( '[[' .. item .. ']]' )
            :done()
        :tag( 'td' )
            :wikitext( addcommas( data.price ) )
            :done()
        :tag( 'td' )
            :wikitext( div )
            :done()
 
    if data.alchable == nil or yesno( data.alchable ) then
        local low, high = '<i>Unknown</i>', '<i>Unknown</i>'
 
        if data.value then
            low = addcommas( math.floor( data.value * 0.4 ) )
            high = addcommas( math.floor( data.value * 0.6 ) )
        end
 
        tr
            :tag( 'td' )
                :wikitext( low )
                :done()
            :tag( 'td' )
                :wikitext( high )
                :done()
    else
        tr
            :tag( 'td' )
                :attr( 'colspan', '2' )
                :wikitext( '<i>Cannot be alchemised</i>' )
                :done()
    end
 
    tr
        :tag( 'td' )
            :wikitext( limit )
            :done()
        :tag( 'td' )
            :wikitext( members )
            :done()
        :tag( 'td' )
            :css( 'white-space', 'nowrap' )
            :wikitext( '[[Exchange:' .. item .. '|view]]' )
            :done()
        :tag( 'td' )
            :css( 'font-size', '85%' )
            :wikitext( timeago{data.date} )
            :done()
 
    return tostring( tr )
 
end
 
--
-- {{GEExists}}
--
function p.exists( frame )
    local args = frame:getParent().args
    local item = checkTitle( args[1] or '' )
    local noErr, data = pcall( mw.loadData, 'Module:Exchange/' .. item )
 
    if noErr then
        return '1'
    end
 
    return '0'
end
 
--
-- Internal method for p.highAlchTable, p.lowAlchTable and p.genStoreTable
--
-- @param item {string} The name of the item
-- @param data {table} The item's ge data
-- @param alch {number} The item's alch/sell value
-- @param min {number} (optional) Sets the cap for amount of items that can be converted to gp per hour
-- @param natPrice {number} (optional) Sets the price of a Nature rune (set to `0` by `p.genStoreTable`)
--
local function alchTable( item, data, alch, min, natPrice )
    local timeago = require( 'Module:TimeAgo' )._ago
    local round = require( 'Module:Number' )._round
    -- gen store doesn't need a nat price as it's not used
    -- therefore we'd set it to 0
    local natPrice = natPrice or load( 'Nature rune' ).price
    local profit = alch - data.price - natPrice
 
    local image = '[[File:' .. item .. '.png|' .. item .. ']]'
    local itemStr = '[[' .. item .. ']]'
    local priceStr = addcommas( data.price )
    local alchStr = addcommas( alch )
    local profitStr = addcommas( profit )
    local roi = tostring( round( ( profit / ( data.price + natPrice ) * 100 ), 1 ) ) .. '%'
    local limit = data.limit and addcommas( data.limit ) or '<i>Unknown</i>'
    local maxProfit = '<i>Unknown</i>'
    local members = '<i>Unknown</i>'
    local details = '[[Exchange:' .. item .. '|view]]'
    local lastUpdated = timeago{data.date}
 
    if data.limit then
        -- cap at 4800, the maximum number of alchs that can be cast every 4 hours
        -- varies for general store rows
        min = min or 4800 
        min = ( data.limit > min ) and min or data.limit
        maxProfit = addcommas( min * profit )
    end
 
    mw.log( maxProfit )
 
    if data.members == true then
        members = '[[File:P2P.png|30px|link=Members]]'
    elseif data.members == false then
        members = '[[File:F2P icon.png|30px|link=Free-to-play]]'
    end
 
    local tr = mw.html.create( 'tr' )
        :tag( 'td' )
            :wikitext( image )
            :done()
        :tag( 'td' )
            :css( {
                width = '15%',
                ['text-align'] = 'left'
            } )
            :wikitext( itemStr )
            :done()
        :tag( 'td' )
            :wikitext( priceStr )
            :done()
        :tag( 'td' )
            :wikitext( alchStr )
            :done()
        :tag( 'td' )
            :wikitext( profitStr )
            :done()
        :tag( 'td' )
            :wikitext( roi )
            :done()
        :tag( 'td' )
            :wikitext( limit )
            :done()
        :tag( 'td' )
            :wikitext( maxProfit )
            :done()
        :tag( 'td' )
            :wikitext( members )
            :done()
        :tag( 'td' )
            :css( 'white-space', 'nowrap' )
            :wikitext( details )
            :done()
        :tag( 'td' )
            :css( 'font-size', '85%' )
            :wikitext( lastUpdated )
            :done()
 
    return tostring( tr )
end
 
--
-- {{HighAlchTableRow}}
--
-- @example {{HighAlchTableRow|<item>}}
--
function p.highAlchTable( frame )
    local args = frame:getParent().args
    local item = checkTitle( args[1] )
    local data = load( item )
    local alch = math.floor( data.value * 0.6 )
 
    return alchTable( item, data, alch )
end
 
--
-- {{LowAlchTableRow}}
--
-- @example {{LowAlchTableRow|<item>}}
--
function p.lowAlchTable( frame )
    local args = frame:getParent().args
    local item = checkTitle( args[1] )
    local data = load( item )
    local alch = math.floor( data.value * 0.4 )
 
    return alchTable( item, data, alch )
end
 
--
-- {{GenStoreTableRow}}
--
-- @example {{GenStoreTableRow|<item>}}
--
function p.genStoreTable( frame )
    local args = frame:getParent().args
    local item = checkTitle( args[1] )
    local data = load( item )
    local alch = math.floor( data.value * 0.3 )
 
    return alchTable( item, data, alch, 50000, 0 )
end
 
--
-- {{GEP}}
-- {{GEPrice}}
--
-- @example {{GEPrice|<item>|<format>|<multi>}}
-- @example {{GEPrice|<item>|<multi>}}
-- @example {{GEP|<item>|<multi>}}
--
function p.price( frame )
    -- usage: {{foo|item|format|multi}} or {{foo|item|multi}}
    local args = frame.args
    local pargs = frame:getParent().args
    local item = pargs[1]
    local expr = mw.ext.ParserFunctions.expr
    local round = tonumber( pargs.round )
 
    if item then
        item = mw.text.trim( item )
    else
        error( '"item" argument not specified', 0 )
    end
 
    -- default to formatted for backwards compatibility with old GE templates
    local format = true
    local multi = 1
 
    -- format is set with #invoke
    -- so set it first to allow it to be overridden by template args
    if args.format ~= nil then
        format = yesno( args.format )
    end
 
    if tonumber( pargs[2] ) ~= nil then
        multi = tonumber( pargs[2] )
 
    -- indicated someone is trying to pass an equation as a mulitplier
    -- known use cases are fractions, but pass it to #expr to make sure it's handled correctly
    elseif pargs[2] ~= nil and mw.ustring.find( pargs[2], '[/*+-]' ) then
        multi = tonumber( expr( pargs[2] ) )
 
    -- uses elseif to prevent something like {{GEP|Foo|1}}
    -- causing a formatted output, as 1 casts to true when passed to yesno
    elseif type( yesno( pargs[2] ) ) == 'boolean' then
        format = yesno( pargs[2] )
 
        if tonumber( pargs[3] ) ~= nil then
            multi = tonumber( pargs[3] )
        end
    end 
 
    return p._price( item, multi, format, round )
end
 
--
-- {{GEItem}}
--
-- @example {{GEItem|<item>}}
--
function p.table( frame )
    local args = frame:getParent().args
    local item = args[1]
 
    if item then
        item = mw.text.trim( item )
    else
        error( '"item" argument not specified', 0 )
    end
 
    return p._table( item )
end
 
--
-- experimental limit method for [[Grand Exchange/Buying Limits]]
--
function p.gemwlimit( frame )
    local item  = frame:getParent().args[1]
    local data = mw.loadData( 'Module:Exchange/' .. item )
 
    return data.limit
end
 
--
-- {{ExchangeItem}}
-- {{GEDiff}}
-- {{GELimit}}
-- {{GEValue}}
-- {{GEId}}
--
-- @example {{ExchangeItem|<item>}}
-- @example {{GEDiff|<item>}}
-- @example {{GELimit|<item>}}
-- @example {{GEValue|<item>}}
-- @example {{GEId|<item>}}
--
function p.view( frame )
    local fargs = frame.args
    local pargs = frame:getParent().args
    local item = pargs[1]
    local view = fargs.view or ''
    local loadView = {limit=true, value=true, itemId=true}
 
    if item then
        item = mw.text.trim( item )
    else
        error( '"item" argument not specified', 0 )
    end
 
    view = mw.ustring.lower( view )
 
    if view == 'itemid' then
        view = 'itemId'
    end
 
    if view == 'diff' then
        return p._diff( item )
 
    elseif loadView[view] then
        return load( item )[view]
 
    else
        local default = require( 'Module:ExchangeDefault' )
        -- handle redirects and casing of item before passing it on
        item = checkTitle( item )
        return default.main( item )
    end
end
 
return p

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