Editing Module:WikiProject assessment progression/sandbox

require('strict')

local assessedClasses = {
	'List','Stub','Start','C','B',
	'GA','A','FA','FL','FM',
	'Book','Category','Disambig','File',
	'Portal','Project','Redirect','Template',
}

local p = {}
local getArgs = require('Module:Arguments').getArgs
local errorMessage = require('Module:Error')

local function categoryCount(category, project)
	return mw.site.stats.pagesInCategory(
		string.format('%s %s articles', category, project),
		'pages'
	)
end

-- rounding to first decimal, from http://lua-users.org/wiki/SimpleRound
local function round(num)
	return math.floor(num * 10 + 0.5) / 10
end

local function percentComplete(sum, total)
	return tostring(round(100 * sum / total))
end

local function countCategoryArticles(classesToCount, project)
	local classCount = 0
	for _, class in ipairs(classesToCount) do
		classCount = classCount + categoryCount(class..'-Class', project)
	end
	return classCount
end

local function calculateProjectTotal(project)
	return countCategoryArticles(assessedClasses, project) + categoryCount('Unassessed', project)
end

local function countHigherCategories(targetClass, project)
	local higherCategories = {}
	local classKey = getKeyForValue(targetClass, assessedClasses)
	for k, v in ipairs(assessedClasses) do
		if k > classKey then
			higherCategories[k - classKey] = v
		end
	end
	return countCategoryArticles(higherCategories, project)
end

local function getKeyForValue(value, enclosingTable)
	for k, v in ipairs(enclosingTable) do
		if v == value then
			return k
		end
	end
	return nil
end

local function setClasses(args)
	local classes = {}
	if args['class'] then
		classes = {args['class']}
	else
		classes = assessedClasses
	end
	return classes
end

function p.main(frame)
	local args = getArgs(frame)
	return p._main(args)
end

function p._main(args)
	local project = args['project']
	local classes = setClasses(args)
	local classCount = countCategoryArticles(classes, project)
	local total = calculateProjectTotal(project)
	if total == 0 then
		return errorMessage('Error: project not found for project name "'..project..'"')
	else
		return percentComplete(classCount, total)
	end
end

return p