local p = {}
local fetch = nil -- lazy load

local function load_political_party_module()
	if fetch == nil then
		fetch = require('Module:Political party')._fetch
	end
end

local function page_exist(page_name)
    if not page_name then return false end
    if mw.title.new(page_name).exists then return true end
    return false
end

local function simplify_rowspan(text)
	text = mw.ustring.gsub(text or '', 'rowspan="1"%s*', '')
	return text
end

local function getData(args)
	local display_name = nil
	local yesno = require('Module:Yesno')
	if args[1] == "Independent" then
		args[1] = "Independent politician"
	end
	if yesno(args.dab) == true then
		display_name = args[1]
	elseif yesno(args.full) == true then
		display_name = mw.ustring.gsub(args[1], '%s+%b()$', '')
	elseif args.shortname then
		display_name = args.shortname
	else
		load_political_party_module()
		display_name = fetch({args[1], 'shortname'})
	end
	
	if yesno(args.bold) == true then display_name = "'''" .. display_name .. "'''" end

	local text = nil
	if yesno(args.no_link) == true then
		text = display_name
	else
		-- TODO: should this be on by default or do we want red links?
		if page_exist(args[1]) then
			text = string.format("[[%s|%s]]", args[1], display_name)
		else
			text = display_name
		end
	end

	local color = args.colour or args.color
	if not color then
		load_political_party_module()
		color = fetch({args[1], 'color'})
	end
	return text, color
end

function p._cell(args)
	if not args[1] then return '' end
	local text, color = getData(args)
	
	local line1 = 'rowspan="%s" style="width: 2px; background-color: %s;" data-sort-value="%s" |\n'
	local line2 = '| scope="row" rowspan="%s" style="text-align: left;" | %s'
	
	local rowspan = tonumber(args.rowspan) or 1
	line1 = string.format(line1, rowspan, color, args[1])
	line2 = string.format(line2, rowspan, text)

	return simplify_rowspan(line1 .. line2)
end

function p._box(args)
	if not args[1] then return '' end
	local text, color = getData(args)
	
	local seats
	if args.seats then seats = ' (' .. args.seats .. ')' end
	seats = seats or ''
	
	local outline = args.outline or 'black'
	
	local legend = '<span class="legend nowrap" style="page-break-inside:avoid;break-inside:avoid-column"><span class="legend-color" style="display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;border:1px solid ' .. outline .. ';background-color:' .. color .. '"> </span> ' .. text .. seats .. '</span>'
	return legend
end

function p.cell(frame)
	local getArgs = require('Module:Arguments').getArgs
	local args = getArgs(frame)
	local check = require('Module:Check for unknown parameters')._check
	local tracking = check({
		['unknown']='[[Category:Pages using Party name with color with unknown parameters|_VALUE_ ]]',
		['preview']='Page using [[Template:Party name with color]] with unknown parameter "_VALUE_"',
		['showblankpositional']='1',
		'1', 'color', 'colour', 'dab', 'full', 'no_link', 'rowspan', 'shortname', 'bold'
	}, frame:getParent().args)
	return p._cell(args) .. tracking
end

function p.box(frame)
	local getArgs = require('Module:Arguments').getArgs
	local args = getArgs(frame)
	return p._box(args)
end

return p