Editing Module:Protection banner

-- This module implements {{pp-meta}} and its daughter templates such as
-- {{pp-dispute}}, {{pp-vandalism}} and {{pp-sock}}.

-- Initialise necessary modules.
require('Module:No globals')
local class = require('Module:Middleclass').class
local mArguments = require('Module:Arguments')
local mFileLink = require('Module:File link')
local mProtectionLevel = require('Module:Effective protection level')
local yesno = require('Module:Yesno')

--------------------------------------------------------------------------------
-- PageData class
--------------------------------------------------------------------------------

--[[
-- This class represents a MediaWiki page, just as the mw.title object does.
-- The difference is that this class is much simpler, using only the fields
-- necessary for this module. This is to keep the module extensible while
-- keeping the code as simple as possible, e.g. this way we do not expose
-- mw.title's protectionLevels property to classes that only need to know a
-- page's namespace. The "data" in PageData is so that this class can be more
-- easily differentiated with mw.title.
--]]

local PageData = class('PageData')

function PageData:initialize(titleObj)
	self._namespace = titleObj.namespace
end

function PageData:getNamespace()
	return self._namespace
end

--------------------------------------------------------------------------------
-- ProtectionStatus class
--------------------------------------------------------------------------------

local ProtectionStatus = class('ProtectionStatus')

function ProtectionStatus:initialize(args, titleObj)
	-- Set action
	do
		local actions = {
			create = true,
			edit = true,
			move = true,
			autoreview = true
		}
		if args.action and actions[args.action] then
			self._action = args.action
		else
			self._action = 'edit'
		end
	end

	-- Set level
	do
		local level = mProtectionLevel._main(self._action, titleObj)
		if level == 'accountcreator' then
			-- Lump titleblacklisted pages in with template-protected pages,
			-- since templateeditors can do both.
			level = 'templateeditor'
		end
		self._level = level or '*'
	end

	-- Set reason
	self._reason = args.reason

	-- Set expiry
	self._expiry = args.expiry or 'indef'
end

function ProtectionStatus:getAction()
	return self._action
end

function ProtectionStatus:getLevel()
	return self._level
end

function ProtectionStatus:getReason()
	return self._reason
end

function ProtectionStatus:getExpiry()
	return self._expiry
end

--------------------------------------------------------------------------------
-- Config class
--------------------------------------------------------------------------------

local Config = class('Config')

function Config:initialize()
	self._cfg = mw.loadData('Module:Protection banner/config')
end

function Config:getBannerConfig(protectionStatusObj)
	local cfg = self._cfg
	local action = protectionStatusObj:getAction()
	local reason = protectionStatusObj:getReason()
	if cfg.banners[action][reason] then
		return cfg.banners[action][reason]
	else
		return cfg.defaultBanners[action]
	end
end

function Config:getConfigTable(key)
	local blacklist = {
		banners = true,
		defaultBanners = true
	}
	if not blacklist[key] then
		return self._cfg[key]
	else
		return nil
	end
end

--------------------------------------------------------------------------------
-- Image class
--------------------------------------------------------------------------------

local Image = class('Image')

function Image:initialize(configObj, protectionStatusObj, pageDataObj)
	self._configObj = configObj
	self._protectionStatusObj = protectionStatusObj
	self._pageDataObj = pageDataObj
end

function Image:setFilename(filename)
	if filename then
		self._filename = filename
	else
		local images, action, level, reason, namespace
		do
			local configObj = self._configObj
			local protectionStatusObj = self._protectionStatusObj
			local pageDataObj = self._pageDataObj
			images = configObj:getConfigTable('images')
			action = protectionStatusObj:getAction()
			level = protectionStatusObj:getLevel()
			reason = protectionStatusObj:getReason()
			namespace = pageDataObj:getNamespace()
		end

		local image
		if reason == 'office' or reason == 'reset' then
			image = images.office
		elseif namespace == 10 or namespace == 828 then
			-- We are in the template or module namespaces.
			if level == 'templateeditor' then
				image = images.template
			elseif level == 'sysop' then
				image = images.indef
			end
		elseif action == 'create' then
			image = images.create
		elseif action == 'move'
			and (
				level == 'templateeditor'
				or level == 'sysop'
			)
		then
			image = images.move
		elseif action == 'edit' then
			if level == 'sysop' then
				image = images.full
			elseif level == 'autoconfirmed' then
				image = images.semi
			end
		elseif action == 'autoreview' then
			if level == 'autoconfirmed' then
				image = images.pc1
			elseif level == 'reviewer' then
				image = images.pc2
			end
		end
		self._filename = image
	end
end

function Image:setWidth(width)
	self._width = width
end

function Image:setAlt(alt)
	self._alt = alt
end

function Image:setLink(link)
	self._link = link
end

function Image:setCaption(caption)
	self._caption = caption
end

function Image:export()
	return mFileLink.new(self._filename or 'Transparent.gif')
		:width(self._width or 20)
		:alt(self._alt)
		:link(self._link)
		:caption(self._caption)
		:render()
end

--------------------------------------------------------------------------------
-- Blurb class
--------------------------------------------------------------------------------

local Blurb = class('Blurb')

function Blurb:initialize(configObj, protectionStatusObj, pageDataObj)
	self._configObj = configObj
	self._protectionStatusObj = protectionStatusObj
	self._bannerConfig = configObj:getBannerConfig(protectionStatusObj)
	self._pageDataObj = pageDataObj
end

function Blurb:_makeIntroParameter()
end

function Blurb:_makePagetypeParameter()
	local pagetypes = self._configObj:getConfigTable('pagetypeNamespaces')
	local namespace = self._pageDataObj:getNamespace()
	return pagetypes[namespace] or pagetypes.default or 'page'
end

function Blurb:_substituteParameters(msg)
	if not self._params then
		local params, parameterFuncs = {}, {}
		setmetatable(params, {
			__index = function (t, k)
				local param
				if parameterFuncs[k] then
					param = parameterFuncs[k]()
				end
				params[k] = param
				return param
			end
		})
		
		parameterFuncs[1] = function ()
			return self:_makeIntroParameter()
		end

		-- TODO: Write parameter functions
		self._params = params
	end
	return mw.message.newRawMessage(msg):params(self._params):plain()
end

--------------------------------------------------------------------------------
-- BannerTemplate class
--------------------------------------------------------------------------------

local BannerTemplate = class('BannerTemplate')

function BannerTemplate:initialize()
end

function BannerTemplate:render()
end

--------------------------------------------------------------------------------
-- Banner class
--------------------------------------------------------------------------------

local Banner = BannerTemplate:subclass('Banner')

--------------------------------------------------------------------------------
-- Padlock class
--------------------------------------------------------------------------------

local Padlock = BannerTemplate:subclass('Padlock')

--------------------------------------------------------------------------------
-- BannerFactory class
--------------------------------------------------------------------------------

local BannerFactory = class('BannerFactory')

function BannerFactory:initialize(
		args,
		configObj,
		protectionStatusObj,
		pageDataObj
	)

	-- Set dependent objects
	self._configObj = configObj
	self._protectionStatusObj = protectionStatusObj
	self._pageDataObj = pageDataObj

	-- Set object paradigm to use
	if yesno(args.small) then
		self._paradigm = 'padlock'
	else
		self._paradigm = 'banner'
	end
end

function BannerFactory:newBannerTemplate()
end

function BannerFactory:newBlurb()
end

function BannerFactory:newImage()
	local image = Image:new()
	if self._paradigm == 'padlock' then
		image:setWidth(20)
	else
		image:setWidth(40)
	end
	return image
end

--------------------------------------------------------------------------------
-- Category class
--------------------------------------------------------------------------------

local Category = class('Category')

function Category:initialize()
end

function Category:setName(name)
	self._name = name
end

function Category:export()
	if self._categoryName then
		return string.format(
			'[[%s:%s]]',
			mw.site.namespaces[14].name,
			self._categoryName
		)
	else
		return ''
	end
end

--------------------------------------------------------------------------------
-- ProtectionCategory class
--------------------------------------------------------------------------------

local ProtectionCategory = Category:subclass('ProtectionCategory')

function ProtectionCategory:setName(
		name,
		configObj,
		protectionStatusObj,
		namespace
	)
	--[[
	-- Sets the protection category. If a category name is not provided, this
	-- method gets a category name from the module config, given a combination
	-- of the protection type, the protection level, the namespace number, the
	-- reason for protection, and the expiry date.
	--]]
	
	-- If a name was provided, use that.
	if name then
		Category.setName(self, name)
	end
	
	-- Get the namespace category key from the namespace number.
	local nskey
	do
		local categoryNamespaces = configObj:getConfigTable('categoryNamespaces')
		if not namespace or type(namespace) ~= 'number' then
			nskey = nil
		else
			nskey = categoryNamespaces[ns]
			if not nskey and ns % 2 == 1 then
					nskey = 'talk'
			end
		end
	end
 
	--[[
	-- Define the properties table. Each property is a table containing the
	-- canonical order that the property is tested in, the position the
	-- property has in the category key strings, and the property value itself.
	--]]
	local properties = {
		expiry = {order = 1, keypos = 5, val = protectionStatusObj:getExpiry()},
		namespace = {order = 2, keypos = 3, val = nskey},
		reason = {order = 3, keypos = 4, val = protectionStatusObj:getReason()},
		level = {order = 4, keypos = 2, val = protectionStatusObj:getLevel()},
		action = {order = 5, keypos = 1, val = protectionStatusObj:getAction()}
	}
 
	--[[
	-- Apply the category order configuration, if any. The configuration value
	-- will be a property string, e.g. 'reason', 'namespace', etc. The property
	-- corresponding to that string is tested last (i.e. it is the most
	-- important, because it keeps its specified value the longest) and the
	-- other properties are tested in the canonical order. If no configuration
	-- value is specified then the canonical order is used.
	--]]
	local configOrder = {}
	do
		local bannerConfig = configObj:getBannerConfig(protectionStatusObj)
		local categoryOrder = bannerConfig.categoryOrder
		for propertiesKey, t in pairs(properties) do
			configOrder[t.order] = t
		end
		if categoryOrder then
			local property = properties[categoryOrder]
			if not property then
				local msg = '"'
					.. categoryOrder
					.. '" is not a valid value of cfg.reasons.'
					.. reason
					.. '.categoryOrder'
				error(msg)
			end
			table.insert(configOrder, table.remove(configOrder, property.order))
		end
	end
 
	--[[
	-- Define the attempt order. Properties with no value defined are moved
	-- to the end, where they will later be given the value "all". This is
	-- to cut down on the number of table lookups in the cats table, which
	-- grows exponentially with the number of properties with valid values.
	-- We keep track of the number of active properties with the noActive
	-- parameter.
	--]]
	local noActive, attemptOrder
	do
		local active, inactive = {}, {}
		for i, t in ipairs(configOrder) do
			if t.val then
				active[#active + 1] = t
			else
				inactive[#inactive + 1] = t
			end
		end
		noActive = #active
		attemptOrder = active
		for i, t in ipairs(inactive) do
			attemptOrder[#attemptOrder + 1] = t
		end
	end
 
	--[[
	-- Check increasingly generic key combinations until we find a match.
	-- If a specific category exists for the combination of properties
	-- we are given, that match will be found first. If not, we keep
	-- trying different key combinations until we match using the key
	-- "all-all-all-all-all".
	--
	-- To generate the keys, we index the property subtables using a
	-- binary matrix with indexes i and j. j is only calculated up to
	-- the number of active properties. For example, if there were three
	-- active properties, the matrix would look like this, with 0
	-- corresponding to the string "all", and 1 corresponding to the
	-- val field in the property table:
	-- 
	--   j 1  2  3
	-- i  
	-- 1   1  1  1
	-- 2   0  1  1
	-- 3   1  0  1
	-- 4   0  0  1
	-- 5   1  1  0
	-- 6   0  1  0
	-- 7   1  0  0
	-- 8   0  0  0
	-- 
	-- Values of j higher than the number of active properties are set
	-- to the string "all".
	--
	-- A key for the category table is constructed for each value of i.
	-- The correct position of the value in the key is determined by the
	-- pos field in the property table.
	--]]
	local cats = configObj:getConfigTable('categories')
	local cat
	for i = 1, 2^noActive do
		local key = {}
		for j, t in ipairs(attemptOrder) do
			if j > noActive then
				key[t.keypos] = 'all'
			else
				local quotient = i / 2 ^ (j - 1)
				quotient = math.ceil(quotient)
				if quotient % 2 == 1 then
					key[t.keypos] = t.val
				else
					key[t.keypos] = 'all'
				end
			end
		end
		key = table.concat(key, '-')
		local attempt = cats[key]
		if attempt then
			cat = attempt
			break
		end
	end
	if cat then
		Category.setName(self, cat)
	else
		error(
			'No category match found;'
			.. ' please define the category for key "all-all-all-all-all"'
		)
	end
end

--------------------------------------------------------------------------------
-- ExpiryCategory class
--------------------------------------------------------------------------------

local ExpiryCategory = Category:subclass('ExpiryCategory')

--------------------------------------------------------------------------------
-- ErrorCategory class
--------------------------------------------------------------------------------

local ErrorCategory = Category:subclass('ErrorCategory')

--------------------------------------------------------------------------------
-- CategoryFactory class
--------------------------------------------------------------------------------

local CategoryFactory = class('CategoryFactory')

function CategoryFactory:initialize(
		configObj,
		protectionStatusObj,
		pageDataObj
	)

	-- Set dependent objects
	self._configObj = configObj
	self._protectionStatusObj = protectionStatusObj
	self._pageDataObj = pageDataObj
end

function CategoryFactory:getCategoryObjects()
	local ret = {}
	local classes = {ProtectionCategory, ExpiryCategory, ErrorCategory}
	for i, aClass in ipairs(classes) do
		ret[#ret + 1] = aClass:new()
	end
	return ret
end

--------------------------------------------------------------------------------
-- ProtectionBanner class
--------------------------------------------------------------------------------

local ProtectionBanner = {}

function ProtectionBanner.exportToWiki(frame, title)
	local args = mArguments.getArgs(frame)
	return ProtectionBanner.exportToLua(args, title)
end

function ProtectionBanner.exportToLua(args, title)
	title = title or mw.title.getCurrentTitle()

	-- Get data objects
	local thePageData = PageData:new(title)
	local theProtectionStatus = ProtectionStatus.new(args, title)
	local theConfig = Config:new()

	local ret = {}

	-- Render the banner
	do
		local theBannerFactory = BannerFactory:new(
			args,
			theConfig,
			theProtectionStatus,
			thePageData
		)
		local banner = theBannerFactory:newBannerTemplate()
		local image = theBannerFactory:newImage()
		local blurb = theBannerFactory:newBlurb()
		--TODO: actual rendering
		ret[#ret + 1] = banner:export()
	end

	-- Render the categories
	do
		local theCategoryFactory = CategoryFactory:new(
			theConfig,
			theProtectionStatus,
			thePageData
		)
		local categoryObjects = theCategoryFactory:getCategoryObjects()
		for i, obj in ipairs(categoryObjects) do
			ret[#ret + 1] = obj:export()
		end
	end

	return table.concat(ret)	
end

function ProtectionBanner._exportClasses()
	-- This is used to export the classes for testing purposes.
	return {
		PageData = PageData,
		ProtectionStatus = ProtectionStatus,
		Config = Config,
		Image = Image,
		Blurb = Blurb,
		BannerTemplate = BannerTemplate,
		Banner = Banner,
		Padlock = Padlock,
		BannerFactory = BannerFactory,
		Category = Category,
		ProtectionCategory = ProtectionCategory,
		ErrorCategory = ErrorCategory,
		ExpiryCategory = ExpiryCategory,
		CategoryFactory = CategoryFactory
	}
end

return ProtectionBanner