Module:Item thumbnail

---

local getArgs      = require('Module:Arguments').getArgs
local QueryBuilder = require('Module:QueryBuilder')
local VariablesLua = mw.ext.VariablesLua

local p = {}

local image_cache_key    = 'it_cache__%s_image'
local pagename_cache_key = 'it_cache__%s_page'

local function getCacheValues(item)
	local image = VariablesLua.var(string.format(image_cache_key, item))
	local pageName = VariablesLua.var(string.format(pagename_cache_key, item))
	
	return {
		image = image,
		page_name = pageName
	}
end

local function setCacheValues(item, image, pageName)
	VariablesLua.vardefine(string.format(image_cache_key, item), image)
	VariablesLua.vardefine(string.format(pagename_cache_key, item), pageName)
end

function p.main(frame)
	local args = getArgs(frame)
	
	local item = string.lower(args['item'] or '')
	local image = nil
	local link = nil
	
	if item then
		local values = getCacheValues(item)
		
		image = values['image']
		link = values['pageName']
		
		if image == nil or image == '' or link == nil or link == '' then
			local qb = QueryBuilder.new()
			qb
				:setTables('items')
				:setFields([[
					_pageName,
					thumbnail
				]])
				:addWhere('item_name', '=', item)
				
			local results = qb:query()
				
			if #results > 0 then
				image = results[1]['thumbnail']
				link = results[1]['_pageName']
				
				setCacheValues(item, thumb, link)
			end
		end
	end
	
	return p._main{
		image = args['image'] or image,
		size  = args['size'],
		link  = args['link'] or link,
		count = args['count']
	}
end

function p._main(args)
	local thumb = args['image'] or ''
	local thumbSize = args['size']  or '64px'
	local link = args['link'] or ''
	local count = args['count'] or 1

	local root = mw.html.create('div')
	root:addClass('item-thumbnail')
		:css({
			['height'] = thumbSize,
			['width'] = thumbSize
		})
		:wikitext(string.format(
			'[[File:%s|%s|link=%s|%s]]',
			thumb,
			thumbSize,
			link,
			link
		))
	
	if count and tonumber(count) > 1 then
		root:tag('div')
			:addClass('item-count')
			:wikitext('×' .. count)
	end
		
	return
		mw.getCurrentFrame():extensionTag{
			name = 'templatestyles',
			args = { src = 'Template:Item thumbnail/styles.css' }
		} .. tostring(root)
end

return p