local p = {}

local ARG = require "Module:Arguments"
local CFCM = require "Module:ComplForColorModules"
local TNTT = require "Module:TNTTools"
--local SD = require "Module:SimpleDebug"

local I18n = 'ChartColors'

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

--local RS_ColorNameInvalid = 'El nom del color (%s) no és vàlid (ha de ser Categ20 o Plotter)'
--local RS_ColorNumInvalid = 'El nombre de colors hauria d’estar entre 1 i %d (ara és %d)'
--local RS_StartNumInvalid = 'El número del primer color hauria d’estar entre 1 i %d (ara és %d)'

local category20 = {
	'#1f77b4', '#aec7e8', '#ff7f0e', '#ffbb78', '#2ca02c', '#98df8a', '#d62728', '#ff9896', '#9467bd', '#c5b0d5', 
	'#8c564b', '#c49c94', '#e377c2', '#f7b6d2', '#7f7f7f', '#c7c7c7', '#bcbd22', '#dbdb8d', '#17becf', '#9edae5',
}
local plotter = {--from Module:Plotter/DefaultColors
	'red', 'blue', 'green', 'yellow', 'fuchsia', 'aqua', 'brown', 'orange', 'purple', 'sienna',
	'#F0A3FF', '#191919', '#005C31', 'honeydew', '#808080', 'khaki', 'lime', 'navy', 'pink', '#426600',
	'#5EF1F2', 'turquoise', '#E0FF66', 'violet', '#FFFF80', '#FF5005',
}

function p.GetColors (ColorName, IsInv, StartN, N, CallError)
	local SelColors = {}
	local ColorNameL = string.lower(ColorName)
	local Palet0 = {}
	if ColorNameL == 'categ20' then
		Palet0 = category20
	elseif ColorNameL == 'plotter' then
		Palet0 = plotter 
	elseif CallError then	
		error (I18nStr ('ColorNameInvalid',ColorName))
	end	
	local MaxN = table.getn(Palet0)
	if (N < 0) or (N > MaxN) then
		error (I18nStr ('ColorNumInvalid',tostring(MaxN),tostring(N)))
	else
		local Palet = {}
		if IsInv then
			for i=MaxN, 1, -1 do
				table.insert(Palet, Palet0[i])
			end	
		else
			Palet = Palet0
		end
		if StartN > MaxN then
			error (I18nStr ('StartNumInvalid',tostring(MaxN),tostring(StartN)))
		end	
		local Step = 1
		local NEnd = N
		if (ColorNameL == 'categ20') and (N<=10) then 
			Step = 2
			if StartN == 1 then
				NEnd = N*2
			end	
		end	
		if StartN == 1 then
			for i=1, NEnd, Step do
				table.insert(SelColors, Palet[i])
			end
		else
			Count = 0
			for i=StartN, MaxN, Step do
				table.insert(SelColors, Palet[i])
				Count = Count + 1
				if Count == NEnd then
					break
				end	
			end
			if Count < NEnd then
				for i=1, MaxN, Step do
					table.insert(SelColors, Palet[i])
					Count = Count + 1
					if Count == NEnd then
						break
					end	
				end
			end	
		end	
		return SelColors
	end	
end --GetColors

function p.ColorNameInvStartFromS (S)
	local StartN = 1
	local ParamsA = {}
	local ColorName, IsInv
    ColorName, IsInv, ParamsA = CFCM.ColorNameInvFromS0 (S)
	local PN = table.getn(ParamsA)
	if PN > 1 then
		if ParamsA[2]=='i' then
			IsInv = true
		else
			StartN = tonumber (ParamsA[2])
		end
		if PN == 3 then
			StartN = tonumber (ParamsA[3])
		end	
	end	
	return ColorName, IsInv, StartN			    	
end --ColorNameInvStartFromS

local function ColorNameInv (args)
	local S = args[1] or ''
    local ColorName, IsInv, ParamsA = CFCM.ColorNameInvFromS0 (S)
    local StartN = 1
	ColorName, IsInv, StartN = p.ColorNameInvStartFromS (S)
	return ColorName, IsInv, StartN			    	
end --ColorNameInv	

function p.ShowColors(frame)
	local args = ARG.getArgs(frame,{
		removeBlanks = false
	});
	local ColorName, IsInv, StartN = ColorNameInv (args)
	local N = tonumber(args[2])
	local WriteColor = args[3] or ""
	local ColorFound = {}
	ColorFound = p.GetColors (ColorName, IsInv, StartN, N, true)
	local boxes = {}
	for i=1, table.getn(ColorFound) do
		table.insert(boxes, CFCM.Box(ColorFound[i],WriteColor))
	end	
	return table.concat(boxes, " ")
end --ShowColors

function p.Legends(frame)
	local args = ARG.getArgs(frame,{
		removeBlanks = false
	})
	local Nargs = require("Module:TableTools").length(args)
	local ColorName, IsInv, StartN = ColorNameInv (args)
	local N = tonumber(args[2])
	local ColWidth = args[3]
	local ColorFound = {}
	local Labels = {}
	local NLabels = 0
	local OutlineColor
	local IsTemplate = true
	ColorFound = p.GetColors (ColorName, IsInv, StartN, N, true)
	Labels, NLabels, OutlineColor = CFCM.GetLabels (args, N, 4)
	return CFCM.LegendText (ColorFound, Labels, NLabels, ColWidth, IsTemplate, OutlineColor)
end	

return p