--
-- This module implements {{CollegePrimaryHex}}, {{CollegePrimaryStyle}}, 
-- {{CollegePrimaryColorLink}}, {{CollegeSecondaryHex}}, 
-- {{CollegeSecondaryStyle}}, {{CollegeSecondaryColorLink}}, and {{NCAA color}}
--
local p = {}

local data_module = "Module:College color/data"

local function stripwhitespace(text)
	return text:match("^%s*(.-)%s*$")
end
local function sRGB ( v ) 
	if (v <= 0.03928) then 
		v = v / 12.92
	else
		v = math.pow((v+0.055)/1.055, 2.4)
    end
	return v
end
local function color2lum( c )
	c = stripwhitespace(c or ''):lower()

	-- remove leading # (if there is one)
	c = mw.ustring.match(c, '^[#]*([a-f0-9]*)$')
 
	-- split into rgb
	local cs = mw.text.split(c or '', '')
	if( #cs == 6 ) then
	 	local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[2]))/255 )
		local G = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[4]))/255 )
		local B = sRGB( (16*tonumber('0x' .. cs[5]) + tonumber('0x' .. cs[6]))/255 )
 
		L = 0.2126 * R + 0.7152 * G + 0.0722 * B
		return L
	elseif ( #cs == 3 ) then
	 	local R = sRGB( (16*tonumber('0x' .. cs[1]) + tonumber('0x' .. cs[1]))/255 )
		local G = sRGB( (16*tonumber('0x' .. cs[2]) + tonumber('0x' .. cs[2]))/255 )
		local B = sRGB( (16*tonumber('0x' .. cs[3]) + tonumber('0x' .. cs[3]))/255 )
 
		L = 0.2126 * R + 0.7152 * G + 0.0722 * B
		return L
	end
 
	-- failure, return blank
	return ''
end

local function get_colors(team, unknown)
	team = stripwhitespace(team or '')
	unknown = unknown or {"DCDCDC", "000000"}
	
	local use_default = {
		[""] = 1,
		["retired"] = 1,
		["free agent"] = 1,
	}
	
	local colors = nil
	
	if ( team and use_default[team:lower()] ) then
		colors = {"DCDCDC", "000000"}
	else
		local all_colors = mw.loadData(data_module)
		colors = all_colors[team]
		if ( colors and type(colors) == 'string' ) then
			colors = all_colors[colors]
		end
	end

	return colors or unknown
end

local function team_color(team, num, num2)
	local colors = get_colors(team, nil)

	num = tonumber(num:match('[1-3]') or '0')
	num2 = tonumber(num2:match('[1-3]') or '0')
	if ( num ) then
		return colors[num] or colors[num2] or ''
	else
		return ''
	end
end

local function team_style1(team, borderwidth, fontcolor)
	local colors = get_colors(team, nil)
	
	local color = '#' .. (colors[3] or colors[2] or '')
	local style = 'background-color:#' .. (colors[1] or '') .. ';color:' .. (fontcolor or color) .. ';'
	-- remove the border if it's nearly white
	if ((1 + 0.05)/(color2lum(color) + 0.05) < 1.25) then
		borderwidth = '0'
	end
	borderwidth = tonumber(borderwidth or '2') or 0
	if (borderwidth > 0 and color ~= '#FFFFFF') then
		style = style .. ' border:' .. borderwidth .. 'px solid ' .. color .. ';'
	end
	
	return style
end

local function team_style2(team, borderwidth, fontcolor)
	local colors = get_colors(team, nil)
	
	local color = '#' .. (colors[1] or '')
	local style = 'background-color:#' .. (colors[3] or colors[2] or '') .. ';color:' .. (fontcolor or color) .. ';'
	-- remove the border if it's nearly white
	if ((1 + 0.05)/(color2lum(color) + 0.05) < 1.25) then
		borderwidth = '0'
	end
	borderwidth = tonumber(borderwidth or '2') or 0
	if (borderwidth > 0 and color ~= '#FFFFFF') then
		style = style .. ' border:' .. borderwidth .. 'px solid ' .. color .. ';'
	end
	
	return style
end

local function team_header1(team, borderwidth)
	local colors = get_colors(team, nil)
	-- set the default background
	local background = (colors[1] or 'FFFFFF'):upper()
	-- set background to white if it's nearly white
	if ((1 + 0.05)/(color2lum(background) + 0.05) < 1.25) then
		background = 'FFFFFF'
	end
	-- now pick a font color
	local fontcolor = '000000'
	-- compute the luminosity of the background
	local lum = color2lum(background)
	-- compute the contrast with white and black
	local wcontrast = (1 + 0.05)/(lum + 0.05)
	local bcontrast = (lum + 0.05)/(0 + 0.05)
	-- select the text color with the best contrast
	if( bcontrast > wcontrast + 1.25 ) then
		fontcolor = '000000'
	else
		fontcolor = 'FFFFFF'
	end

	local style
	if( background == 'FFFFFF' ) then
		style = 'background-color:none;color:#' .. fontcolor .. ';'
	else
		style = 'background-color:#' .. background .. ';color:#' .. fontcolor .. ';'
	end

	if borderwidth then
		borderwidth = tonumber(borderwidth or '2') or 0
		local bordercolor = (colors[3] or colors[2] or 'FFFFFF'):upper()
		if (borderwidth > 0 and bordercolor ~= 'FFFFFF') then
			-- do not add a border if it's nearly white
			if ((1 + 0.05)/(color2lum(bordercolor) + 0.05) >= 1.25) then
				style = style .. ' border:' .. borderwidth .. 'px solid #' .. bordercolor .. ';'
			end
		end
	end
	return style
end

local function team_header2(team)
	local colors = get_colors(team, nil)
	-- set the default background
	local background = (colors[3] or colors[2] or 'FFFFFF'):upper()
	-- set background to white if it's nearly white
	if ((1 + 0.05)/(color2lum(background) + 0.05) < 1.25) then
		background = 'FFFFFF'
	end
	-- if the background is white, then use the primary background instead
	if( background == 'FFFFFF' ) then
		background = (colors[1] or 'FFFFFF'):upper()
	end
	-- now pick a font color
	local fontcolor = '000000'
	-- compute the luminosity of the background
	local lum = color2lum(background)
	-- compute the contrast with white and black
	local wcontrast = (1 + 0.05)/(lum + 0.05)
	local bcontrast = (lum + 0.05)/(0 + 0.05)
	-- select the text color with the best contrast
	if( bcontrast > wcontrast + 1.25 ) then
		fontcolor = '000000'
	else
		fontcolor = 'FFFFFF'
	end
	if( background == 'FFFFFF' ) then
		return 'background-color:none;color:#' .. fontcolor .. ';'
	else
		return 'background-color:#' .. background .. ';color:#' .. fontcolor .. ';'
	end
end

local function team_stripe1(team, borderwidth)
	local colors = get_colors(team, nil)
	
	-- set the default scheme
	local background = colors[1] or ''
	local fontcolor = colors[2] or ''
	local bordercolor = (colors[3] or colors[2] or ''):upper()
	borderwidth = tonumber(borderwidth or '3') or 0
	
	-- if there is no tertiary color, then pick a font color
	if (colors[3] == nil) then
		-- compute the luminosity of the background
		local lum = color2lum(colors[1])
		-- compute the contrast with white and black
		local wcontrast = (1 + 0.05)/(lum + 0.05)
		local bcontrast = (lum + 0.05)/(0 + 0.05)
		-- select the text color with the best contrast
		if( bcontrast > wcontrast + 1.25 ) then
			fontcolor = '000000'
		else
			fontcolor = 'FFFFFF'
		end
	end

	-- finally build the style string
	local style = ''
	if (borderwidth > 0) then
		-- use the primary as the border if the border is white or close to white
		local bordercontrast = (1 + 0.05)/(color2lum(bordercolor) + 0.05)
		if (bordercontrast < 1.25) then
			bordercolor = background
			local fontcontrast = (1 + 0.05)/(color2lum(colors[2] or 'FFFFFF') + 0.05)
			if (fontcontrast < 1.25) then
				fontcolor = colors[2] or 'FFFFFF'
			end
		end
		style = style .. ' border:' .. borderwidth .. 'px solid #' .. bordercolor .. ';'
		style = style .. ' border-left: none; border-right: none;'
		style = style .. ' box-shadow: inset 0 2px 0 #FEFEFE, inset 0 -2px 0 #FEFEFE;'
	end
	style = 'background-color:#' .. background .. ';color:#' .. fontcolor .. ';' .. style
	
	return style
end

local function team_check(team, unknown)
	local colors = get_colors(team, unknown)
	if type(colors) == 'table' then
		return 'known'
	else
		return unknown
	end
end

function p.color(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_color(args[1] or '', args[2] or '', args[3] or '')
end

function p.color1(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_color(args[1] or '', '1', '')
end

function p.color32(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_color(args[1] or '', '3', '2')
end

function p.style1(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_style1(args[1] or '', args['border'], args['color'])
end

function p.style2(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_style2(args[1] or '', args['border'], args['color'])
end

function p.header1(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_header1(args[1] or '', args['border'])
end

function p.header2(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_header2(args[1] or '')
end

function p.stripe1(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_stripe1(args[1] or '', args['border'])
end

function p.check(frame)
	local args = (frame.args[1] ~= nil) and frame.args or frame:getParent().args
	return team_check(args[1] or '', args[2] or '')
end

function p.testtable(frame)
	local contrasttable_mod = require("Module:College color/contrast")
	return contrasttable_mod._testtable(frame.args)
end

return p