-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

--

-- luacheck: ignore 213/i

local t_concat, t_insert = table.concat, table.insert;

local char, format = string.char, string.format;

local tonumber = tonumber;

local ipairs = ipairs;

local io_write = io.write;

local m_floor = math.floor;

local type = type;

local setmetatable = setmetatable;

local pairs = pairs;

local windows;

if os.getenv("WINDIR") then

	windows = require "util.windows";

end

local orig_color = windows and windows.get_consolecolor and windows.get_consolecolor();

local _ENV = nil;

-- luacheck: std none

local stylemap = {

			reset = 0; bright = 1, dim = 2, underscore = 4, blink = 5, reverse = 7, hidden = 8;

			black = 30; red = 31; green = 32; yellow = 33; blue = 34; magenta = 35; cyan = 36; white = 37;

			["black background"] = 40; ["red background"] = 41; ["green background"] = 42; ["yellow background"] = 43;

			["blue background"] = 44; ["magenta background"] = 45; ["cyan background"] = 46; ["white background"] = 47;

			bold = 1, dark = 2, underline = 4, underlined = 4, normal = 0;

		}

local winstylemap = {

	["0"] = orig_color, -- reset

	["1"] = 7+8, -- bold

	["1;33"] = 2+4+8, -- bold yellow

	["1;31"] = 4+8 -- bold red

}

local cssmap = {

	[1] = "font-weight: bold", [2] = "opacity: 0.5", [4] = "text-decoration: underline", [8] = "visibility: hidden",

	[30] = "color:black", [31] = "color:red", [32]="color:green", [33]="color:#FFD700",

	[34] = "color:blue", [35] = "color: magenta", [36] = "color:cyan", [37] = "color: white",

	[40] = "background-color:black", [41] = "background-color:red", [42]="background-color:green",

	[43]="background-color:yellow",	[44] = "background-color:blue", [45] = "background-color: magenta",

	[46] = "background-color:cyan", [47] = "background-color: white";

};

local fmt_string = char(0x1B).."[%sm%s"..char(0x1B).."[0m";

local function getstring(style, text)

	if style then

		return format(fmt_string, style, text);

	else

		return text;

	end

end

local function gray(n)

	return m_floor(n*3/32)+0xe8;

end

local function color(r,g,b)

	if r == g and g == b then

		return gray(r);

	end

	r = m_floor(r*3/128);

	g = m_floor(g*3/128);

	b = m_floor(b*3/128);

	return 0x10 + ( r * 36 ) + ( g * 6 ) + ( b );

end

local function hex2rgb(hex)

	local r = tonumber(hex:sub(1,2),16);

	local g = tonumber(hex:sub(3,4),16);

	local b = tonumber(hex:sub(5,6),16);

	return r,g,b;

end

setmetatable(stylemap, { __index = function(_, style)

	if type(style) == "string" and style:find("%x%x%x%x%x%x") == 1 then

		local g = style:sub(7) == " background" and "48;5;" or "38;5;";

		return g .. color(hex2rgb(style));

	end

end } );

local csscolors = {

	red = "ff0000"; fuchsia = "ff00ff"; green = "008000"; white = "ffffff";

	lime = "00ff00"; yellow = "ffff00"; purple = "800080"; blue = "0000ff";

	aqua = "00ffff"; olive  = "808000"; black  = "000000"; navy = "000080";

	teal = "008080"; silver = "c0c0c0"; maroon = "800000"; gray = "808080";

}

for colorname, rgb in pairs(csscolors) do

	stylemap[colorname] = stylemap[colorname] or stylemap[rgb];

	colorname, rgb = colorname .. " background", rgb .. " background"

	stylemap[colorname] = stylemap[colorname] or stylemap[rgb];

end

local function getstyle(...)

	local styles, result = { ... }, {};

	for i, style in ipairs(styles) do

		style = stylemap[style];

		if style then

			t_insert(result, style);

		end

	end

	return t_concat(result, ";");

end

local last = "0";

local function setstyle(style)

	style = style or "0";

	if style ~= last then

		io_write("\27["..style.."m");

		last = style;

	end

end

if windows then

	function setstyle(style)

		style = style or "0";

		if style ~= last then

			windows.set_consolecolor(winstylemap[style] or orig_color);

			last = style;

		end

	end

	if not orig_color then

		function setstyle() end

	end

end

local function ansi2css(ansi_codes)

	if ansi_codes == "0" then return "</span>"; end

	local css = {};

	for code in ansi_codes:gmatch("[^;]+") do

		t_insert(css, cssmap[tonumber(code)]);

	end

	return "</span><span style='"..t_concat(css, ";").."'>";

end

local function tohtml(input)

	return input:gsub("\027%[(.-)m", ansi2css);

end

return {

	getstring = getstring;

	getstyle = getstyle;

	setstyle = setstyle;

	tohtml = tohtml;

};