local p = {}
local origArgs

function p.add_file_prefix(str)
  if string.match(string.lower(str), '^file:') then
    return str
  else
    return 'File:' .. str
  end
end

function p.add_separator(box, title)
  box:tag('tr')
           :tag('td')
           :attr('class', 'header')
           :attr('colspan', '2')
           :wikitext(title)
end

function p.add_entry(value, right)
  local e = mw.html.create('tr')
  e:tag('td')
    :attr('class', 'label')
    :wikitext(value)
  e:node(right)
  return e   
end

function has_arg(name)
	-- The argument can exist and be empty or not exist at all
	return string.len(origArgs[name] or '') > 0
end

function arg(name)
	return origArgs[name]
end

function p.chip(frame)
	
    if frame == mw.getCurrentFrame() then
        origArgs = frame:getParent().args
    else
        origArgs = frame.args
    end
	
	
    local infobox = mw.html.create('table')

    infobox
        :attr('class', 'infobox')
        
    infobox
    	:tag('tr')
			:tag('td'):attr('colspan', '2')
			:tag('small'):attr('style', 'float: right;')
            :wikitext('[[Special:FormEdit/gpu/' .. frame:preprocess('{{FULLPAGENAME}}') .. '|<i class="fa fa-edit"></i>Edit Values]]')
            
    -- header
    if has_arg('name') then
      infobox
        :tag('tr')
          :tag('td')
            :attr('class', 'header-main')
            :attr('colspan', '2')
            :wikitext('[[name::' .. arg('name') .. ']]')
    end
 
    -- some general info first
    p.add_separator(infobox, 'General Info')
    
	-- type
	if has_arg('type') then
		if arg('type') == 'integrated' then
	  		infobox:node(p.add_entry('Type', mw.html.create('td')
	  			:attr('style', 'width: 99%;'):wikitext(
	  			'[[instance of::integrated graphics processor| ]] IGP' ..
    			'[[Category:integrated graphics processor models]]')))
		end
		if arg('type') == 'discrete' then
	  		infobox:node(p.add_entry('Type', mw.html.create('td')
	  			:attr('style', 'width: 99%;'):wikitext(
	  			'[[instance of::discrete graphics processor| ]] DGP' ..
    			'[[Category:discrete graphics processor models]]')))
		end
	end
    
    -- designer
    if has_arg('designer') then
      	local designers = mw.html.create('td'):attr('style', 'width: 99%;')
      	designers:wikitext('[[designer::' .. arg('designer') .. '| ]][[' .. arg('designer') .. ']]' ..
      				'[[category:microprocessor models by ' .. mw.ustring.lower(arg('designer')) .. ']]')
		if has_arg('microarch') then
			designers:wikitext('[[category:microprocessor models by ' .. mw.ustring.lower(arg('designer')) ..
					' based on ' .. mw.ustring.lower(arg('microarch')) .. ']]')
		end
      
      for i = 2, 10 do
      	if not has_arg('designer ' .. i) then break end
      		designers:wikitext(', [[designer::' .. arg('designer ' .. i) .. '| ]][[' .. arg('designer ' .. i) .. ']]' ..
      				'[[category:microprocessor models by ' .. mw.ustring.lower(arg('designer ' .. i)) .. ']]')
  		if has_arg('microarch') then
			designers:wikitext('[[category:microprocessor models by ' .. mw.ustring.lower(arg('designer ' .. i)) ..
  					' based on ' .. mw.ustring.lower(arg('microarch')) .. ']]')
  		end
      end
   	  infobox:node(p.add_entry('Designer', designers))
	end
    
    -- manufacturer
    if has_arg('manufacturer') then
      local manufacturers = '[[manufacturer::' .. arg('manufacturer') .. '| ]][[' .. arg('manufacturer') .. ']]' ..
      		'[[category:microprocessor models by ' .. mw.ustring.lower(arg('manufacturer')) .. ']]'
      		
      for i = 2, 10 do
      	if not has_arg('manufacturer ' .. i) then break end
      	manufacturers = manufacturers .. ', [[manufacturer::' .. arg('manufacturer ' .. i) .. '| ]][[' .. arg('manufacturer ' .. i) .. ']]' ..
      		'[[category:microprocessor models by ' .. mw.ustring.lower(arg('manufacturer ' .. i)) .. ']]'
      end
      
   	  infobox:node(p.add_entry('Manufacturer', mw.html.create('td'):wikitext(manufacturers)))
	end
    
    infobox:wikitext('[[full page name::' .. frame:preprocess('{{FULLPAGENAME}}') .. '| ]]')
    
    if has_arg('future') and
    	(string.lower(arg('future')) == 'yes' or string.lower(arg('future')) == 'true') then
    	infobox:wikitext('[[Category:future microprocessor models]][[ldate::3000| ]]')
	elseif has_arg('first launched') then
    	infobox:wikitext('[[ldate::' .. arg('first launched') .. '| ]]')
	elseif has_arg('first announced') then
    	infobox:wikitext('[[ldate::' .. arg('first announced') .. '| ]]')
	else --alright launched but no date?
    	infobox:wikitext('[[ldate::1000| ]]')
    end
	
    return infobox
end

return p