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local Utils = {}

--[[ Explode a str into a table of fragments delimited by separator.
If limit is provided the resulting table will have limit entries.
credit: http://richard.warburton.it improved to add a limit
]]
function Utils.explode( sep, str, limit )
    if ( sep == '' ) then return false end
    local pos, arr = 0, {}
    local i = 1
    local limit = limit or 0
    -- for each divider found
    for st, sp in function() return string.find( str, sep, pos, true ) end do
        if i == limit then break end
        table.insert( arr, string.sub(str, pos, st-1) ) -- Attach chars left of current divider
        pos = sp + 1 -- Jump past current divider
        i = i + 1
    end
    table.insert( arr, string.sub(str, pos) ) -- Attach chars right of last divider
    return arr
end

function Utils.trim( str )
	return mw.text.trim( str )
end

--[[ Removes disambig parenthesis at the end of the title.
frame is required for the function to work both from a module or from a wikipage
limit defines how many disambig parts must be removed (default is 1)
title is the text to work on (default is current page title if not defined)
]]
function Utils.cleanTitle( title, limit )
	title = title or mw.getCurrentFrame():getParent():getTitle()
	limit = limit or 1
	for i=1, limit do
		if string.match( title, ".*%(" ) == nil then break end
		title = string.match( title, ".*%(" )
		title = mw.text.trim( title:sub( 1, #title-1 ) )
	end
	return title
end

function Utils.cleanLink( title, limit )
	return "[[" .. title .. "|" .. Utils.cleanTitle( title, limit ) .. "]]"
end

-- Make the first lettre a maj
function Utils.startMaj( text )
	text = text or ""
	return string.upper( text:sub( 1, 1 ) ) .. text:sub( 2 )
end

-- Returns a color code base on element
function Utils.color( element )
	local element = element
	local color = "inherit"
	if element == "fire" then
		color = "#f44336"
	elseif element == "water" then
		color = "#2196f3"
	elseif element == "earth" then
		color = "#795548"
    elseif element == "wind" then
		color = "#8bc34a"
    elseif element == "dark" then
		color = "#673ab7"
    elseif element == "light" then
		color = "#ffc107"
    elseif element == "life" then
		color = "#f06292"
    elseif element == "prismatic" then
    end
    return color
end

-- Color text based on element
function Utils.colorText( text, element )
	local text = text or ""
	local element = element
	local span = mw.html.create( 'span' )
	span	:css( 'color', Utils.color( element ) )
			:wikitext( text )
	return tostring( span )
end

-- Display stars
function Utils.stars( n )
	local n = n or 1
		local rotate = function( elmt, angle )
		return elmt:css( 'transform', "rotateZ(" .. angle .. "deg)" )
	end
	local lheight = function( elmt, lh )
		return elmt:css( 'line-height', lh )
	end
	local lspacing = function( elmt, ls )
		return elmt:css( 'letter-spacing', ls .. 'px' )
	end

	local s = mw.html.create( 'span' )
	s:wikitext( "★" ):css( 'display', "inline-block" )

	local stars = mw.html.create( 'div' )
	stars:css( { ['text-align'] = 'center', display = 'inline-block' } )

	if n == 1 then
		stars:wikitext( tostring(s) )
	elseif n == 2 then
		rotate( stars, "-30" ); rotate( s, "30" )
		lheight( stars, "0.6" ); lspacing( stars, "-3" )
		stars:wikitext( tostring(s):rep(2) )
	elseif n == 3 then
		rotate( stars, "-20" ); rotate( s, "20" )
		lheight( stars, "0.6" ); lspacing( stars, "-1" )
		stars:wikitext( "<div>"..tostring(s).."</div>"
			.."<div>"..tostring(s):rep(2).."</div>" )
	elseif n == 4 then
		rotate( stars, "-15" ); rotate( s, "15" )
		lheight( stars, "0.75" ); lspacing( stars, "-2" )
		stars:wikitext( "<div>"..tostring(s):rep(2).."</div>"
			.."<div>"..tostring(s):rep(2).."</div>" )
	elseif n == 5 then
		lheight( stars, "0.4" ); lspacing( stars, "1" )
		stars:wikitext( "<div>"..tostring(s):rep(2).."</div>"
			.."<div>"..tostring(s).."</div>"
			.."<div>"..tostring(s):rep(2).."</div>" )
	end
	return tostring( stars )
end

-- Sort a table with numeric keys after some of them are removed
function Utils.sortTable( t )
	local sorted = {}
	local j = 1
	for i=1, #t do
		if t[i] ~= nil then
			sorted[j] = t[i]
			j = j + 1
		end
	end
	return sorted
end

function Utils.test(frame)
	auto = require( 'Module:AutoAbilities' )
	return auto.test( frame.args[1] )
end

Utils.misc = {}
function Utils.misc.is_frame(frame)
    -- the type of the frame is a table containing the functions, so check whether some of these exist
    -- should be enough to avoid collisions.
    return not(frame == nil or type(frame) ~= 'table' or (frame.argumentPairs == nil and frame.callParserFunction == nil))
end

function Utils.misc.get_frame(frame)
    if Utils.misc.is_frame(frame) then
        return frame
    end
    return mw.getCurrentFrame()
end

return Utils
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