-- This module implements {{Television ratings graph}}.

local contrast_ratio = require('Module:Color contrast')._ratio

--------------------------------------------------------------------------------
-- TVRG class
-- The main class.
--------------------------------------------------------------------------------

local TVRG = {}

-- Convert HEX codes to RGB values
function TVRG.hex2rgb(hex)
    hex = hex:gsub('#', '')
    if #hex == 3 then
    	-- #000 format
    	return tonumber("0x"..hex:sub(1,1)..hex:sub(1,1))/256, tonumber("0x"..hex:sub(2,2)..hex:sub(2,2))/256,
    		   tonumber("0x"..hex:sub(3,3)..hex:sub(3,3))/256
	else
    	-- #000000 format
    	return tonumber("0x"..hex:sub(1,2))/256, tonumber("0x"..hex:sub(3,4))/256, tonumber("0x"..hex:sub(5,6))/256
    end
end

-- Allow usages of {{N/A}} cells
function TVRG.NACell(frame,text)
	local cell = mw.html.create('td')
	local attrMatch = '([%a-]*)="([^"]*)"'
	
	infoParam = frame:expandTemplate{title='Celda',args={'N/A'}}
	
	-- Gather styles of {{N/A}} and assign to node variable
	while true do
		local a,b = string.match(infoParam,attrMatch)
		if a == nil or b == nil then break end
		cell:attr(a,b)
		infoParam = string.gsub(infoParam,attrMatch,'',1)
	end

	infoParam = string.gsub(infoParam,'%s*|%s*','',1)
	cell:wikitext(infoParam)
	
	return cell
end

-- Create the graph and table
function TVRG.new(frame,args)
	args = args or {}
	
	-- Variables
	local timeline = ''
	local longestseason = -1
	local promedio = args.promedio and 1 or 0
	local season_title = args['título_temporada'] or 'Temporada'
	local root = mw.html.create('div')
		:attr('align', 'center')
	
	-- Create the timeline
	
	-- Number of actual viewer numbers
	local numberargs = 0
	for k,v in pairs(args) do 
		if not string.match(k,'[^%d]+') and not string.match(v,'[^%d\.]+') then numberargs = numberargs + 1 end
	end

	-- Determine number of seasons
	local num_seasons = -1
	for k,v in pairs(args) do
		local thisseason = tonumber(string.sub(k,6))
		if string.sub(k,1,5) == 'color' and thisseason > num_seasons then
			num_seasons = thisseason
		end
	end

	-- Determine number of episodes
	local num_episodes
		-- Subtract promedios if included (they should be equal to the number of seasons)
		if promedio == 1 then
			num_episodes = numberargs-num_seasons
		else
			num_episodes = numberargs
		end

	-- Bar width
	local barwidth
	if num_episodes < 20 then barwidth = 8
	elseif num_episodes >= 20 and num_episodes < 50 then barwidth = 7
	elseif num_episodes >= 50 and num_episodes < 80 then barwidth = 6
	elseif num_episodes >= 80 then barwidth = 5
	end

	-- Graph width
	local graphwidth
	if args.ancho_barra == nil then
		if num_episodes < 20 then graphwidth = num_episodes*13+98
		elseif num_episodes >= 20 and num_episodes < 50 then graphwidth = num_episodes*12+98
		elseif num_episodes >= 50 and num_episodes < 80 then graphwidth = num_episodes*11+98
		elseif num_episodes >= 80 then graphwidth = num_episodes*10+98
		end
	else
		if num_episodes < 20 then graphwidth = num_episodes*(13+args.ancho_barra-barwidth)+98
		elseif num_episodes >= 20 and num_episodes < 50 then graphwidth = num_episodes*(12+args.ancho_barra-barwidth)+98
		elseif num_episodes >= 50 and num_episodes < 80 then graphwidth = num_episodes*(11+args.ancho_barra-barwidth)+98
		elseif num_episodes >= 80 then graphwidth = num_episodes*(10+args.ancho_barra-barwidth)+98
		end
	end

	-- Basis parameters
	timeline = timeline .. "ImageSize  = width:" .. (args.ancho or graphwidth) .. " height:" .. (args.altura or 300) .. "\n"
	timeline = timeline .. "PlotArea   = left:50 bottom:70 top:35 right:50\n"
	timeline = timeline .. "AlignBars  = justify\n"
	
	timeline = timeline .. "Colors     =\n"
	timeline = timeline .. " id:gray value:gray(0.7)\n"
	
	-- Colour and legend variables
	local season = 1
	for season = 1,num_seasons do 
		local r,g,b = TVRG.hex2rgb(args['color' .. season] or '#006600')
		
		local GraphLegend = season_title .. " " .. season
		if args["leyenda" .. season] then
			local legendKey = string.sub(args["leyenda" .. season], 0, 1)
			if type(tonumber(legendKey)) == "number" then
				GraphLegend = season_title .. " " .. args["leyenda" .. season]
			else
				GraphLegend = args["leyenda" .. season]
			end
		end
		
		timeline = timeline .. " id:season" .. season .. " value:rgb("..r..","..g..","..b..") " ..
			(args.hidelegend == nil and "legend:" .. string.gsub(string.gsub(GraphLegend, ' ', '_'), "''(.-)''", '%1') or '') .. "\n"
		season = season + 1
	end

	-- Determine maximum viewer figure
	local maxviewers = -1
	local multiple = 'millones'
	for k,v in pairs(args) do
		local num = tonumber(v)
		if tonumber(k) ~= nil and num ~= nil and num > maxviewers then
			maxviewers = num
		end
	end
	if maxviewers <= 1.5 then
		multiple = 'miles'
		maxviewers = maxviewers*1000
		for k, v in pairs(args) do
			local num = tonumber(v)
			if tonumber(k) ~= nil and num ~= nil then args[k] = tostring(num*1000) end
		end
	end

	-- Further parameters, with rounded-up viewer figures as maximum period
	timeline = timeline .. "DateFormat = x.y\n"
	timeline = timeline .. "Period     = from:0 till:" .. math.ceil(maxviewers) .. "\n"
	timeline = timeline .. "TimeAxis   = orientation:vertical\n"
	timeline = timeline .. "ScaleMajor = gridcolor:gray increment:" .. (args.intervalos_y or 10^math.ceil(math.log10(maxviewers)-math.log10(15))) .. " start:0\n"
	timeline = timeline .. (args.hidelegend == nil and "Legend     = orientation:horizontal\n" or "")

	-- Interval parameter set to prevent overlapping bars
	local bar = 1
	if args.intervalos_x then
		timeline = timeline .. "BarData    =\n"
		for k,v in pairs(args) do
			if string.lower(v) == 'n/a' then v = '' end
			if tonumber(k) ~= nil and (tonumber(v) ~= nil or v == '') and (promedio == 0 or (promedio == 1 and args[k+1] ~= '-' and args[k+1] ~= nil)) then
				timeline = timeline .. "  bar:"..bar.."  text:"..((bar == 1 or bar % args.intervalos_x == 0) and bar or '&nbsp;').."\n"
				bar = bar + 1
			end
		end
	end

	-- Plot data
	timeline = timeline .. "PlotData   =\n"
	timeline = timeline .. "  width:" .. (args.ancho_barra or barwidth) .. "\n"
	
	-- Add bars to timeline, one per viewer figure
	local bar = 1
	local season = 0
	local thisseason = 0
	
	for k,v in pairs(args) do
		if string.lower(v) == 'n/a' then v = '' end
		if tonumber(k) ~= nil then
			if v == '-' then
				-- Hyphen means new season, so change season colour
				season = season + 1
				
				-- Determine highest number of episodes in a season
				if thisseason > longestseason then
					longestseason = thisseason
				end
				thisseason = 0
			elseif promedio == 0 or (promedio == 1 and args[k+1] ~= '-' and args[k+1] ~= nil) then
				-- Include white/black bar to act as border
				local black_cr = contrast_ratio{args['color' .. season], 'black', ['error'] = 0}
				local white_cr = contrast_ratio{'white', args['color' .. season], ['error'] = 0}
				local bgrnd_cr = (black_cr > white_cr and 'black' or 'gray')
	
				timeline = timeline .. "  mark:(line," .. bgrnd_cr .. ")\n"
				timeline = timeline .. "  color:" .. bgrnd_cr .. "\n"
				timeline = timeline .. "  bar:" .. bar .. " width:" .. ((args.ancho_barra or barwidth)+2) .. " from:start till:" .. (v ~= '' and v or 'start') .. "\n"
				
				-- Include bar for viewer figure, do not include if promedios are included and the next parameter is a new season marker
				timeline = timeline .. "  color:season" .. season .. "\n"
				timeline = timeline .. "  bar:" .. bar .. " from:start till:" .. (v ~= '' and v or 'start') .. "\n"
				
				-- Increment tracking variables
				thisseason = thisseason + 1
				bar = bar + 1
			end
		end
	end
	-- Determine highest number of episodes in a season after final season's bars
	if thisseason > longestseason then
		longestseason = thisseason
	end
	
	-- Etiquetas de los ejes
	local countryDisplayUS, countryDisplayUK, countryDisplayOther
	if args['país'] ~= nil and args['país'] ~= '' then
		if args['país'] == "U.S." or args['país'] == "US" or args['país'] == "EE.UU." or args['país'] == "Estados Unidos" then countryDisplayUS = 'Estados Unidos'
		elseif args['país'] == "U.K." or args['país'] == "UK" or args['país'] == "Reino Unido" then countryDisplayUK = 'Reino Unido'
		else countryDisplayOther = args['país']
		end
	end
	timeline = timeline .. "TextData =\n"
	timeline = timeline .. "  pos:(" .. ((args.ancho or graphwidth)/2-18) .. ",40) textcolor:black fontsize:M text:Episodio\n"
	timeline = timeline .. "  pos:(10," .. ((args.altura or 300)-20) .. ") textcolor:black fontsize:M text:" .. ((countryDisplayUS or countryDisplayUK or countryDisplayOther) or "") .. ((countryDisplayUS or countryDisplayUK or countryDisplayOther) and "-A") .. "udiencia (" .. multiple .. ")\n"
	
	-- Si hay un título, agréguelo con el título de los espectadores; de lo contrario, solo se mostrará el título de la audiencia.
		if args['título'] ~= nil and args['título'] ~= '' then
			root:wikitext("'''''" .. args['título'] .. "'': Audiencia " .. (((countryDisplayUS or countryDisplayUK or countryDisplayOther) and ("en " .. (countryDisplayUS or countryDisplayUK or countryDisplayOther) .. " ")) or "") .. "(" .. multiple .. ")'''"):css('margin-top', '1em')
		else
			root:wikitext("'''Audiencia por episodio (" .. multiple .. ")'''"):css('margin-top', '1em')
		end

	-- Add timeline to div
	if args.graf_no == nil then
		root:node(frame:extensionTag('timeline', timeline))
	end
	
	-- Create ratings table
	if args.tabla_no == nil then
		local rtable = mw.html.create('table')
		   	:addClass('wikitable')
			:css('text-align', 'center')
		
			-- Create headers rows
			local row = rtable:tag('tr')
			row:tag('th'):wikitext(season_title)
				:attr('colspan','2')
				:attr('rowspan','2')
				:css('padding-left', '.8em')
				:css('padding-right', '.8em')
				
			row:tag('th')
				:attr('colspan',longestseason)
				:wikitext("Episodio número")
				:css('padding-left', '.8em')
				:css('padding-right', '.8em')
				
			-- promedio column
			if promedio == 1 then
				row:tag('th')
				   :attr('scope','col')
				   :attr('rowspan','2')
				   :wikitext("Promedio")
				   :css('padding-left', '.8em')
				   :css('padding-right', '.8em')
			end

			local row = rtable:tag('tr')
			
			for i = 1,longestseason do
				row:tag('th')
				   :attr('scope','col')
				   :wikitext(i)
			end
		
		local season = 1
		local thisseason = 0
		
		-- Create table rows and cells
		for k,v in pairs(args) do
			if tonumber(k) ~= nil then
				-- New season marker, or final episode rating
				if v == '-'  or (promedio == 1 and args[k+1] == nil) then
					if season > 1 then
						-- Spanning empty cells with {{N/A}}
						if thisseason < longestseason then
							row:node(TVRG.NACell(frame,"N/A"):attr('colspan',longestseason-thisseason))
						end
						
						if promedio == 1 then
							-- If promedios included, then set the promedios cell with value or TBD
							if v ~= '' then
								row:tag('td'):wikitext(args[k+1] ~= nil and args[k-1] or v)
							else
								row:node(TVRG.NACell(frame,"TBD"))
							end
							thisseason = thisseason + 1
						end
					end
					
					-- New season marker
					if v == '-' then
						-- New row with default or preset caption
						row = rtable:tag('tr')
						row:tag('th')
							:css('background-color', args['color' .. season])
							:css('width','10px')
						
						row:tag('th')
						   :attr('scope','row')
						   :wikitext(args["leyenda" .. season] and args["leyenda" .. season] or season)
						
						thisseason = 0
						season = season + 1
					end
				elseif promedio == 0 or (promedio == 1 and args[k+1] ~= '-' and args[k+1] ~= nil) then
					-- Viewer figures, either as a number or TBD
					if string.lower(v) == 'n/a' then
						row:node(TVRG.NACell(frame,"N/A"))
					elseif v ~= '' then
						row:tag('td'):wikitext(v)
						   :css('width', '35px')
					else
						row:node(TVRG.NACell(frame,"TBD"))
					end
					thisseason = thisseason + 1
				end
			end
		end
		
		-- Finish by checking if final row needs {{N/A}} cells
		if promedio == 0 and thisseason < longestseason then
			row:node(TVRG.NACell(frame,"N/A"):attr('colspan',longestseason-thisseason))
		end
			
		-- Add table to div root and return
		root:node(rtable)
	end
	
	local span = mw.html.create( 'span' )
	if not args.refs then
		span:wikitext(frame:expandTemplate{ title='cita requerida' })
	end
	     
	if countryDisplayUS then
		root:wikitext("<small>Medición de audiencia realizada por [[Nielsen Media Research]].</small>" .. (args.refs or tostring(span)))
	elseif countryDisplayUK then
		root:wikitext("<small>Medición de audiencia realizada por [[Broadcasters' Audience Research Board]].</small>" .. (args.refs or tostring(span)))
	else
		root:wikitext("<small>Fuente: </small>" .. (args.refs or tostring(span)))
	end
	
	return tostring(root)
end

--------------------------------------------------------------------------------
-- Exports
--------------------------------------------------------------------------------

local p = {}

function p.main(frame)
	local args = require('Module:Arguments').getArgs(frame, {
		removeBlanks = false,
		wrappers = 'Plantilla:Gráfico de audiencias en televisión'
	})
	return TVRG.new(frame,args)
end

return p