local p = { }

local Navbox = require('Module:Navbox')
local Styles = require('Module:WPMILHIST Infobox style')

local function isblank(s)
	return (not s) or s == ''
end
local function ifnotblank(s,p,t)
	return (s and s ~= '') and (p..s) or t
end

function p.main(frame)
    local args = { }
    local pargs = frame:getParent().args
	local fargs = frame.args
    local sargs = {}
    local tcats = ''

	-- process bodystyle and titlestyle
	local style = fargs['style'] or pargs['style'] or ''
	if style == 'wide' then
		args['titlestyle'] = Styles['nav_box_wide_header']
		args['bodystyle'] = Styles['nav_box_wide']
	else
		args['titlestyle'] = Styles['nav_box_header']
		local border = fargs['border'] or pargs['border'] or ''
		if border == 'child' or border == 'subgroup' then
			args['bodystyle'] = Styles['nav_box_child']
			tcats = tcats .. '[[Category:Pages using military navigation subgroups without wide style]]'
		else
			args['bodystyle'] = Styles['nav_box']
		end
	end
	sargs['titlestyle'] = 1
	sargs['bodystyle'] = 1

	-- process groupstyle, abovestyle, belowstyle
	args['groupstyle'] = Styles['nav_box_label'] .. (fargs['groupstyle'] or pargs['groupstyle'] or '')
	sargs['groupstyle'] = 1
	args['abovestyle'] = Styles['nav_box_label'] .. (fargs['abovestyle'] or pargs['abovestyle'] or '')
	sargs['abovestyle'] = 1
	args['belowstyle'] = Styles['nav_box_label'] .. (fargs['belowstyle'] or pargs['belowstyle'] or '')
	sargs['belowstyle'] = 1
	-- process oddstyle, evenstyle
	args['oddstyle'] = ifnotblank((fargs['odd_color'] or pargs['odd_color']),'background:',nil)
	args['evenstyle'] = ifnotblank((fargs['even_color'] or pargs['even_color']),'background:',nil)
	sargs['oddstyle'] = 1
	sargs['evenstyle'] = 1
	-- process name and rawname
	args['name'] = ifnotblank((fargs['name'] or pargs['name']),'',(fargs['rawname'] or pargs['rawname']))
	if isblank(args['name']) then args['navbar'] = 'plain' end
	sargs['name'] = 1
	sargs['rawname'] = 1
	
    -- copy the remaining args, with frame args overriding parent args
    for k, v in pairs(pargs) do
        if v and v ~= '' and sargs[k] == nil then
            args[k] = v
        end
    end
    for k, v in pairs(fargs) do
        if v and v ~= '' and sargs[k] == nil then
            args[k] = v
        end
    end
	-- add allow wrap
	if args['title'] and style ~= 'wide' then
		if not mw.ustring.match(args['title'], '<span class="wrap">') then
			-- probably a more efficient way to match 15 or more characters
			local m = '[^%[%]<>|][^%[%]<>|][^%[%]<>|][^%[%]<>|][^%[%]<>|]'
			m = m .. m .. m
			args['title'] = mw.ustring.gsub(args['title'], 
				'%[%[(' .. m .. '[^%[%]<>|]*)%]%]', 
				'[[%1|<span class="wrap">%1</span>]]')
			args['title'] = mw.ustring.gsub(args['title'], 
				'%[%[([^%[%]<>|]*)|(' .. m .. '[^%[%]<>|]*)%]%]', 
				'[[%1|<span class="wrap">%2</span>]]')
		end
	end
	
	-- add navbox-vertical for non-wide format
	if style ~= 'wide' then
		args['bodyclass'] = 'navbox-vertical' .. (args['bodyclass'] and (' ' .. args['bodyclass']) or '')
	end

	--fallback to "battles" for "list1" for compatibility with [[Template:Campaignbox]]
	if isblank(args['list1']) and not isblank(args.battles) then
		args['list1'] = args.battles
	end
	
    return tcats .. Navbox._navbox(args)

end  

return p