Module:Portugal by district category navigation

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--[[
	v01.18: fix handling of definite article (e.g. for 'the Northwest Territories')
	2.0 Resolve category redirects

 each title consists of three parts
    * prefix
    * district name
    * suffix
 e.g. "Foo in Aveiro District"
    * prefix = "Foo in "
    * district name = "Aveiro District"
    * suffix = ""
 e.g. "Beja District-related lists"
    * prefix = ""
    * district name = "Beja District"
    * suffix = "-related lists"
]]

-- config
local textSize = '90%'
local tableClass="toc"
local evenRowStyle = "vertical-align:top; background-color:#f3f3f3;"
local oddRowStyle = "vertical-align:top;"
local labelStyle = "text-align:right; font-weight: bold; padding: 0.25em 0.5em 0.25em 0.5em;"
local listStyle = "text-align:left; font-weight: normal; padding: 0.25em 0.5em 0.25em 0.5em;"
local greyLinkColor = "#888"
--[[ Note that the table styles are designed to ensure that the navbox is as wide as possible, while still leaving
     enough enough space on the right for portal boxes, commons links, and GeoGroup templates.
     A lot of fiddling was needed to make it work, so please test any changes very carfully in the sandbox.
]]
local tableFallbackMaxWidth="auto"
local tableMaxWidth="calc(100% - 25em)" -- Template:GeoGroup has width: 23em<
-- local tableStyle="margin-left:0; margin-right:auto; clear:left !important; margin-top:0 !important; float:left; width:auto;"
local tableStyle="margin-left:0; margin-right:auto; clear:left !important; margin-top:0 !important; width:auto;"

-- Templates which are allowed to call this module
local callingTemplates = {
	'Template:Portugal by district category navigation',
}

-- globals for this module
local debugging = false
local debugmsg = ""
local tableRowNum = 0
local title_prefix = ""
local title_suffix = ""
local title_prefix
local title_suffix
local thisPageDistrict
local greyLinkCount = 0
local blueLinkCount = 0
local parentname = ""
local templateName

local horizontal = require('Module:List').horizontal
local getArgs = require('Module:Arguments').getArgs
local yesno = require('Module:Yesno')
local ResolveCategoryRedirect = require('Module:Resolve category redirect').rtarget
local p = {}

--[[
	Plain text list of districts
	* Each entry exactly as it appears in running text in category titles, with any prefix (e.g. "the")
	* Be sure to avoid hidden characters and duplicate spaces. They break the pattern-matching on which this module relies
]]
local PortugalDistricts = {
	'Aveiro District',
	'Beja District',
	'Braga District',
	'Bragança District',
	'Castelo Branco District',
	'Coimbra District',
	'Évora District',
	'Faro District',
	'Guarda District',
	'Leiria District',
	'Lisbon District',
	'Portalegre District',
	'Porto District',
	'Santarém District',
	'Setúbal District',
	'Viana do Castelo District',
	'Vila Real District',
	'Viseu District'
}
local PortugalAutonomousRegions = {
	'the Azores',
	'Madeira'
}

-- If the page title matches any of these Lua patterns, treat it as a false positive 
local falsePositiveChecks = {
}

local function publishDebugLog()
	if not debugging then
		return ""
	end
	return "==Debugging ==\n\n" .. debugmsg .. "\n== Output ==\n"
end

-- debugLog builds a log which can be output if debuging is enabled
-- each log entry is given a level, so that the output is not simply a flat list
-- a debug msg may be appended to the previous msg by setting the level to nil
local function debugLog(level, msg)

	if (debugmsg == nil) then
		debugmsg = ""
	end

	if (level ~= nil) then
		-- not appending, so make a new line
		debugmsg = debugmsg .. "\n"
		-- then add the level
		local i
		for i = 1, level do
			if (i % 2) == 1 then
				debugmsg = debugmsg .. "#"
			else
				debugmsg = debugmsg .. "*"
			end
		end 
	end
	debugmsg = debugmsg .. " " .. msg
	return true
end

local function makeTrackingCategory()
	-- discount the current page, which will always be coded as a blue link, but rendered as bold un-navigable
	blueLinkCount = blueLinkCount - 1
	if greyLinkCount == 0 then
		return "[[Category:" .. templateName .. " with no grey links|" .. mw.title.getCurrentTitle().text .. "]]"
	end
	if blueLinkCount == 0 then
		return "[[Category:" .. templateName .. " with all grey links|" .. mw.title.getCurrentTitle().text .. "]]"
	end
	if  greyLinkCount <= 5 then
		return "[[Category:" .. templateName .. " with 1–5 grey links|" .. mw.title.getCurrentTitle().text .. "]]"
	end
	if  greyLinkCount > 15 then
		return "[[Category:" .. templateName .. " with 16 or more grey links|" .. mw.title.getCurrentTitle().text .. "]]"
	end
	if  greyLinkCount > 5 then
		return "[[Category:" .. templateName .. " with 6–15 grey links|" .. mw.title.getCurrentTitle().text .. "]]"
	end
	return ""
end

-- Make a piped link to a category, if it exists
-- If it doesn't exist, just display the greyed the link title without linking
local function makeCatLink(catname, disp)
	local displaytext
	if (disp ~= "") and (disp ~= nil) then
		-- use 'disp' parameter, but strip any trailing disambiguator
		displaytext = mw.ustring.gsub(disp, "%s+%(.+$", "");
		-- also strip any leading word "the"
		displaytext = mw.ustring.gsub(displaytext, "^[tT]he%s+", "");
	else
		displaytext = catname
	end
	local fmtlink
	local catPage = mw.title.new( catname, "Category" )
	if (catPage.exists) then
		fmtlink = "[[:Category:" .. catname .. "|" .. displaytext .. "]]"
		blueLinkCount = blueLinkCount + 1
	else
		fmtlink = '<span style="color:' .. greyLinkColor .. '">' .. displaytext .. "</span>"
		greyLinkCount = greyLinkCount + 1
	end

	return fmtlink
end

local function makeCatName(districtName, prefix, suffix)
	local thisCatName = prefix .. districtName .. suffix
	debugLog(5, "thisCatName = [" .. thisCatName .. "]")
	--[[
		Now check whether the all following conditions are true
			1/ the districtName begins with "the"
			2/ the category does NOT exist if we use "the "
			3/ the category does exist if we strip "the "
		 If those conditions are all true, them strip "the" 
	]] 
	if (mw.ustring.match(districtName, "^[tT]he ") ~= nil) then
		debugLog(6, "DistrictName begins with 'the'")
		local districtNameStripped = mw.ustring.gsub(districtName, "^[tT]he ", "", 1)
		local thisCatNameStripped = prefix .. districtNameStripped .. suffix
		debugLog(6, "thisCatNameStripped = [" .. thisCatNameStripped .. "]")
		local testCatPage = mw.title.new(thisCatName, "Category" )
		local testCatPageStripped = mw.title.new(thisCatNameStripped, "Category" )
		if not testCatPage.exists then
			debugLog(7, "[" .. testCatPage.fullText .. "] .. does not exist") 
			if (testCatPageStripped.exists) then
				debugLog(7, "[" .. testCatPageStripped.fullText .. "] .. DOES exist, so use that") 
				return thisCatNameStripped
			end
		end
	end
	return thisCatName
end

local function makeTableRow(rowLabel, districtList)
	debugLog(2, "makeTableRow, label: ")
	if (rowLabel == nil) then
		rowLabel = "By&nbsp;district"
		debugLog(nil, rowLabel)
	else
		rowLabel = mw.text.trim(rowLabel)
		debugLog(nil, " [" .. rowLabel .. "]")
	end
	tableRowNum = tableRowNum + 1
	local thisRow
	if (tableRowNum % 2) == 0 then
		debugLog(3, "Even-numbered")
		thisRow = '<tr style="' .. evenRowStyle .. '">\n'
	else
		debugLog(3, "Odd-numbered")
		thisRow = '<tr style="' .. oddRowStyle .. '">\n'
	end
	if not ((rowLabel == nil) or (rowLabel =="")) then
		thisRow = thisRow .. '<td style="' .. labelStyle .. '">' .. rowLabel .. '</td>\n'
	end
	-- now begin making the row contents
	debugLog(3, "Process districtList")
	local list_args = {}
	for i, aDistrict in ipairs(districtList) do
		debugLog(4, "No. " .. tostring(i) .. ": [" .. aDistrict .. "]")
		myCatName = ResolveCategoryRedirect(makeCatName(aDistrict, title_prefix, title_suffix))
		table.insert(list_args, makeCatLink(myCatName, aDistrict))
	end
	return thisRow .. '<td style="' .. listStyle .. ';">' .. horizontal(list_args) .. '</td>\n</tr>'
end

local function makeTable()
	debugLog(1, "makeTable")
	tableRowNum = 0
	local myTable = '<table class="' .. tableClass .. '"'
	myTable = myTable .. ' style="' .. tableStyle .. '; font-size:' .. textSize .. '; max-width:' .. tableFallbackMaxWidth .. '; max-width:' .. tableMaxWidth ..'">\n'

	myTable = myTable .. makeTableRow("Districts", PortugalDistricts)
	myTable = myTable .. makeTableRow("Autonomous regions", PortugalAutonomousRegions)
	myTable = myTable .. "</table>\n"
	return myTable
end

local function patternSearchEncode(s)
	return mw.ustring.gsub(s, "([%W])", "%%%1")
end

-- Does the pagename include a district name?
local function finddistrictNameInPagename(pn, districtList, description)
	local i, aDistrict, testDistrict
	debugLog(2, "checking [" .. pn .."] for a district name in district set: " .. description)
	for i, aDistrict in ipairs(districtList) do
		testDistrict = aDistrict
		debugLog(3, "testing: ["  .. testDistrict .. "]")
		local testDistrictEncoded = patternSearchEncode(testDistrict)
		-- For efficiency, the first test is a simple match as a a screening test
		-- If the bare district name is nowhere in the pagename, then no need for
		-- more precise checks
		-- This check would be one line in regex, but Lua pattern matching is cruder,
		--so we need several passes to ensure that any match is of a complete word
		debugLog(4, "simple match? ")
		if (not mw.ustring.match(pn, testDistrictEncoded)) then
			debugLog(nil, "Fail")
		else
			debugLog(nil, "Success")

			-- test for false positives
			local j, aFalsePositiveTest
			for j, aFalsePositiveTest in ipairs(falsePositiveChecks) do
				debugLog(5, "false positive test pattern '" .. aFalsePositiveTest .. "' ? ")
				if (mw.ustring.match(pn, aFalsePositiveTest)) then
					debugLog(nil, "Match, so fail")
					return nil
				end
				debugLog(nil, "No match, so OK")
			end

			debugLog(4, "match whole name? ")
			if (pn == testDistrict) then
				debugLog(nil, "Yes")
				return testDistrict
			end
			debugLog(nil, "No")

			debugLog(4, "match at start, followed by separator? ")
			if mw.ustring.match(pn, "^" .. testDistrictEncoded .. "[^%w]") then
				debugLog(nil, "Yes")
				return testDistrict
			end
			debugLog(nil, "No")
			
			debugLog(4, "match at end, preceded by separator? ")
			if mw.ustring.match(pn, "[^%w]" .. testDistrictEncoded .. "$") then
				debugLog(nil, "Yes")
				return testDistrict
			end
			debugLog(nil, "No")

			debugLog(4, "match anywhere, preceded and followed by separator? ")
			if mw.ustring.match(pn, "[^%w]" .. testDistrictEncoded .. "[^%w]") then
				debugLog(nil, "Yes")
				return testDistrict
			end
			debugLog(nil, "No")

		end
		-- Special case: if the district name we are testing begins with a prefixed "the"
		debugLog(4, "does testDistrict begin with 'the' ? ")
		if (mw.ustring.match(testDistrict, "^[tT]he ") == nil) then
			debugLog(nil, "No")
		else
			debugLog(nil, "Yes")
		end
		if (mw.ustring.match(testDistrict, "^[tT]he ") ~= nil) then
			local testDistrictStripped = mw.ustring.gsub(testDistrict, "^[tT]he ", "", 1)
			local testDistrictStrippedEncoded = patternSearchEncode(testDistrictStripped)
			debugLog(4, "test pattern without leading definite article, i.e. '" .. testDistrictStrippedEncoded .. "' ? ")
			if (mw.ustring.match(pn, "[^%w]" .. testDistrictStrippedEncoded .. "[^%w]")  ~= nil)
			or (mw.ustring.match(pn, "^" .. testDistrictStrippedEncoded .. "[^%w]")  ~= nil)
			or (mw.ustring.match(pn, "[^%w]" .. testDistrictStrippedEncoded .. "$")  ~= nil)
			or (mw.ustring.match(pn, "^" .. testDistrictStrippedEncoded .. "$")  ~= nil) then
				debugLog(nil, "Yes")
				return testDistrictStripped
			end
			debugLog(nil, "No")
		end
	end
	return nil
end

-- parse the pagename to find three parts: prefix, district name, suffix
local function parsePagename(pn)
	debugLog(1, "parsePagename: [" .. pn .. "]")
	local validdistrictName
	validdistrictName = finddistrictNameInPagename(pn, PortugalDistricts, "districtlst")
	if validdistrictName == nil then
	validdistrictName = finddistrictNameInPagename(pn, PortugalAutonomousRegions, "districtlst")
	if validdistrictName == nil then
		return false
	end
	end
	
	-- if we get here, the page name "pn" includes a validdistrictName
	-- so now we need to split the string
	
	debugLog(2, "split pagename around [" .. validdistrictName .. "]")
	local validDistrictEncoded = mw.ustring.gsub(validdistrictName, "([%W])", "%%%1")
	match_prefix, match_district, match_suffix = mw.ustring.match(pn, "^(.*)(" .. validDistrictEncoded .. ")(.*)$")
	
	title_prefix = match_prefix
	title_suffix = match_suffix
	debugLog(2, "parse successful")
	debugLog(3, "title_prefix = [" .. title_prefix .. "]")
	debugLog(3, "thisPageDistrict = [" .. match_district .. "]")
	debugLog(3, "title_suffix = [" .. title_suffix .. "]")
	return true
end

local function getYesNoParam(args, thisParamName, defaultVal)
	local paramVal = args[thisParamName]
	if paramVal == nil then
		paramVal = ""
	end

	debugLog(2, "Evaluate yes/no parameter: [" .. thisParamName .. "] = [" .. paramVal .. "]")
	debugLog(3, "default = " .. ((defaultVal and "Yes") or "No"))
	debugLog(3, "Evaluate as: ")
	local returnValue
	if paramVal == "" then
		returnValue = defaultVal
	else
		returnValue = yesno(args[thisParamName], defaultVal)
	end
	if (returnValue) then
		debugLog(nil, "Yes")
	else
		debugLog(nil, "No")
	end
	return returnValue
end

local function makeErrorMsg(s)
	return '<p class="error">[[' .. parentname .. ']] Error: ' .. s .. '</p>\n'
end

local function isValidParent(p)
	for i, aParent in ipairs(callingTemplates) do
		if p == aParent then
			return true
		end
	end
	return false
end

function p.main(frame)
	local parent = frame:getParent()
	if parent then
		 parentname = parent:getTitle():gsub('/sandbox$', '')
	end

	if (parentname == nil) or not isValidParent(parentname) then
		local errormsg = '<p class="error"> Error: ' .. parentname .. ' is not a valid wrapper for [[' .. frame:getTitle() .. ']]\n'
		errormsg = errormsg .. '<br><br>Valid wrappers: '
		local i, aParent
		for i, aParent in ipairs(callingTemplates) do
			errormsg = errormsg .. '[[' .. aParent  .. ']]'
		end
		errormsg = errormsg .. '</p>'
		return errormsg
	end
	templateName = mw.ustring.gsub(parentname, "^Template:", "")
	
	debugLog(1, "Check parameters")
	debugging = getYesNoParam(frame.args, "debug", false)

	-- get the page title
	thispage = mw.title.getCurrentTitle()
	thispagename = thispage.text;
	
	debugLog(1, "mw.title.getCurrentTitle()")
	debugLog(2, "thispage.text = [" .. thispage.text .."]")
	debugLog(2, "thispage.namespace = [" .. thispage.namespace .."]")
	debugLog(2, "thispage.nsText = [" .. thispage.nsText .."]")
	debugLog(2, "is it a cat? using (thispage:inNamespace(14)): ")
	if not (thispage:inNamespace(14)) then
		debugLog(nil, "No, this is not a category")
		debugLog(1, "Not a category, so no output")
		return makeErrorMsg("only for use on a category page") .. publishDebugLog()
	end
	debugLog(nil, "Yes, this is a category")

	if not parsePagename(thispagename) then
		-- some error parsing the title, so don't proceed to output
		local trackingCatInvalid = "[[Category:" .. templateName .. " on invalid category|" .. mw.title.getCurrentTitle().text .. "]]"
		return makeErrorMsg('the name of this category does not include a valid Portuguese district') .. publishDebugLog() .. trackingCatInvalid
	end
	
	debugLog(1, "all parse done")
	debugLog(2, "title_prefix = [" .. title_prefix .. "]")
	debugLog(2, "title_suffix = [" .. title_suffix .. "]")
	
	local myNavTable = makeTable()
	debugLog(2, "blueLinkCount = [" .. blueLinkCount .. "]. &nbsp; (NB The current page is always counted as a bluelink, but will not be navigable)")
	debugLog(2, "greyLinkCount = [" .. greyLinkCount .. "]")
	
	if (blueLinkCount <= 1) then
		-- This is a navbar to nowhere, so suppress display
		myNavTable = ""
		debugLog(1, "Zero bluelinks (other than the current page) makes this a navbox to nowhere, so do not display the navbox")
	end
	
	local myTrackingCat = makeTrackingCategory()

	return publishDebugLog() .. myNavTable .. myTrackingCat

end

return p