local p = {}

local TNTT = require "Module:TNTTools"

local I18n = 'ComplForColorModules'

--local MoreOneNoData = "Found 2 legends of \"Value not assigned\" or \"Data not available\""
--local FoundNLegendsExpectedN = "Found $1 legends, expected $2"
--local Color = "Color"
--local Legend = "legend"

local function I18nStr (S, ...)
	return TNTT.GetMsgP  (I18n, S, {...})
end

function p.ColorNameInvFromS0 (S)
	local IsInv = false
	local ColorName = ''
	local Params = {}
	if S ~= '' then
		for w in S:gmatch("([^_]+)") do 
	    	table.insert(Params, w)
		end
		ColorName = Params[1]
	end	
	local PN = table.getn(Params)
	if (PN == 2) and (Params[2]=='i') then
		IsInv = true
	end	
	return ColorName, IsInv, Params
end

function p.ColorNameInv (args)
	local ColorName, IsInv, Params = p.ColorNameInvFromS0(args[1])
	return ColorName, IsInv			    	
end	

function p.GetLabels(Args, N, Pos)
    local Labels = {}
    local index = Pos
    while Args[index] do
    	Labels[#Labels+1] = Args[index]
    	index = index + 1
    end
    local NLabels = #Labels
    local OutlineColor = Args['outline'] or ''
    if (NLabels ~= 0) and (NLabels ~= N) then
    	local StartUnknown = (string.sub(Labels[1],1,2) == "--")
    	local EndUnknown = (string.sub(Labels[NLabels],1,2) == "--")
    	if StartUnknown and EndUnknown then
	    	error (I18nStr ('MoreOneNoData'))
    	elseif StartUnknown or EndUnknown then
    		N = N + 1
    	end	
		if (NLabels ~= 0) and (NLabels ~= N) then
	    	error (I18nStr ('FoundNLegendsExpectedN', tostring(NLabels), tostring(N)))
	    end
	end
    return Labels, NLabels, OutlineColor
end

function SColor (Color)
	if string.sub(Color,1,1) == '#' then --the usual
		return string.sub(Color,2,100)
	else
		return Color
	end	
end	

function p.Box(Color,WriteColor)
	if WriteColor == '-' then 
		WriteColor = Color
	elseif WriteColor == 'a' then 	
		WriteColor = Color..'ff' --Alpha channel
	end	
	local TheBox = '<span style="background-color:'..Color..'; border:1px solid gray;" title="'..TNTT.GetStrP(I18n,'Color')..': '..SColor(Color)..'">&nbsp;&nbsp;&nbsp;</span>'	
	if WriteColor ~='' then 
		TheBox = TheBox..'&nbsp;'..WriteColor..' &nbsp;'
	end	
	return TheBox
end	

function p.TextWithTooltip (Text, Tooltip)
	if Tooltip ~= '' then
		return '<span title="'..Tooltip..'">'..Text..'</span>'
	else
		return Text
	end	
end	

function p.LegendColor(Color, Text, Tooltip)
	if Text == '' then
		Text = SColor(Color)
	end	
	return '<li style="list-style-type: none; list-style-image: none;"><span style="border:1px solid gray; background:'..Color..'; margin-right:0.3em; vertical-align: middle; webkit-print-color-adjust:exact; color-adjust:exact; display:inline-block; width:1.05em; height:1em;"></span>'..p.TextWithTooltip(Text,Tooltip)..'</li>'
end	

function LegendCode(Color, Text, OutlineColor)
	local SOutlineColor = ''
	if OutlineColor ~= '' then
		SOutlineColor = '|outline='..OutlineColor
	end	
	return '{{'..TNTT.GetStrP(I18n,'Legend')..'|'..Color..'|'..Text..SOutlineColor..'}}'
end	

function p.LegendText (AColors, Labels, NLabels, ColWidth, IsTemplate, OutlineColor)
	if ColWidth then 
		ColWidth = mw.text.trim(ColWidth)
		if #ColWidth == 0 then
			ColWidth = nil
		end
	end
	local Show, Codes = {}, {}
	local Text = ''
	local WithLabels = NLabels > 0
	if WithLabels then
		local Gray = '#b3b3b3' -- A 40% gray
		if string.sub(Labels[1],1,2) == '--' then
			table.insert(AColors, 1, Gray) 
			Labels[1] = string.sub(Labels[1], 3, 1000)
		elseif string.sub(Labels[NLabels],1,2) == '--' then
			table.insert(AColors, Gray) 
			Labels[NLabels] = string.sub(Labels[NLabels], 3, 1000)
		end
	end
	for i=1, table.getn(AColors) do
		if WithLabels then Text = Labels[i] end
		table.insert(Show, p.LegendColor(AColors[i],Text,''))
	end	
	SShow = table.concat(Show,"\n")
	if ColWidth then 
		local frame = mw.getCurrentFrame()
		SShow = frame:expandTemplate{title="div col",args={colwidth=ColWidth}} .. SShow
		SShow = SShow .. frame:expandTemplate{title="div col end"}
	end
	for i=1, table.getn(AColors) do
		if WithLabels then Text = Labels[i] end
		table.insert(Codes, ' '..LegendCode(AColors[i],Text,OutlineColor))
	end	
	local SCodes = '<pre>\n'
	if ColWidth then
		SCodes = SCodes .. require("Module:Template invocation").invocation("div col",{colwidth=ColWidth}) .. "\n"
	end
	SCodes = SCodes .. table.concat(Codes,"\n")
	if ColWidth and #ColWidth ~= 0 then
		SCodes = SCodes .. "\n{{div col end}}"
	end
	SCodes = SCodes .. "\n</pre>"
	return SShow..'\n'..SCodes
end	

return p