Editing Module:Message box

-- This is a meta-module for producing message box templates, including {{mbox}}, {{ambox}}, {{imbox}}, {{tmbox}}, {{ombox}}, {{cmbox}} and {{fmbox}}.

-- Require necessary modules.
local htmlBuilder = require('Module:HtmlBuilder')
local categoryHandler = require('Module:Category handler').main
local yesno = require('Module:Yesno')

-- Get a language object for formatDate and ucfirst.
local lang = mw.language.getContentLanguage()

-- Set aliases for often-used functions to reduce table lookups.
local format = mw.ustring.format
local tinsert = table.insert
local tconcat = table.concat

local box = {}

local function getTitleObject(page)
    if type(page) == 'string' then
        -- Get the title object, passing the function through pcall 
        -- in case we are over the expensive function count limit.
        local success, title = pcall(mw.title.new, page)
        if success then
            return title
        end
    end
end

local function presentButBlank(s)
    if type(s) ~= 'string' then return end
    if s and not mw.ustring.find(s, '%S') then
        return true
    else
        return false
    end
end

local function union(t1, t2)
    -- Returns the union of two arrays.
    local vals = {}
    for i, v in ipairs(t1) do
        vals[v] = true
    end
    for i, v in ipairs(t2) do
        vals[v] = true
    end
    local ret = {}
    for k in pairs(vals) do
        tinsert(ret, k)
    end
    table.sort(ret)
    return ret
end

local function getArgNums(args, prefix)
    local nums = {}
    for k, v in pairs(args) do
        local num = mw.ustring.match(tostring(k), '^' .. prefix .. '([1-9]%d*)$')
        if num then
            tinsert(nums, tonumber(num))
        end
    end
    table.sort(nums)
    return nums
end

function box.getNamespaceId(ns)
    if not ns then return end
    if type(ns) == 'string' then
        ns = lang:ucfirst(mw.ustring.lower(ns))
        if ns == 'Main' then
            ns = 0
        end
    end
    local nsTable = mw.site.namespaces[ns]
    if nsTable then
        return nsTable.id
    end
end

function box.getMboxType(nsid)
    -- Gets the mbox type from a namespace number.
    if nsid == 0 then
        return 'ambox' -- main namespace
    elseif nsid == 6 then
        return 'imbox' -- file namespace
    elseif nsid == 14 then
        return 'cmbox' -- category namespace
    else
        local nsTable = mw.site.namespaces[nsid]
        if nsTable and nsTable.isTalk then
            return 'tmbox' -- any talk namespace
        else
            return 'ombox' -- other namespaces or invalid input
        end
    end
end

function box:addCat(ns, cat, sort)
    if type(cat) ~= 'string' then return end
    local nsVals = {'main', 'template', 'all'}
    local tname
    for i, val in ipairs(nsVals) do
        if ns == val then
            tname = ns .. 'Cats'
        end
    end
    if not tname then
        for i, val in ipairs(nsVals) do
            nsVals[i] = format('"%s"', val)
        end
        error('invalid ns parameter passed to box:addCat; valid values are ' .. mw.text.listToText(nsVals, nil, ' or '))
    end
    self[tname] = self[tname] or {}
    if type(sort) == 'string' then
        tinsert(self[tname], format('[[Category:%s|%s]]', cat, sort))
    else
        tinsert(self[tname], format('[[Category:%s]]', cat))
    end
end

function box:addClass(class)
    if type(class) ~= 'string' then return end
    self.classes = self.classes or {}
    tinsert(self.classes, class)
end

function box:setTitle(args)
    -- Get the title object and the namespace.
    local pageTitle = getTitleObject(args.page ~= '' and args.page)
    self.title = pageTitle or mw.title.getCurrentTitle()
    local demospace = box.getNamespaceId(args.demospace ~= '' and args.demospace)
    self.nsid = demospace or self.title.namespace
end

function box:getConfig(boxType)
    -- Get the box config data from the data page.
    if boxType == 'mbox' then
        boxType = box.getMboxType(self.nsid)
    end
    local cfgTables = mw.loadData('Module:Message box/configuration')
    local cfg = cfgTables[boxType]
    if not cfg then
        local boxTypes = {}
        for k, v in pairs(dataTables) do
            tinsert(boxTypes, format('"%s"', k))
        end
        tinsert(boxTypes, '"mbox"')
        error(format('invalid message box type "%s"; valid types are %s', tostring(boxType), mw.text.listToText(boxTypes)), 2)
    end
    return cfg
end
    
function box:removeBlankArgs(cfg, args)
    -- Only allow blank arguments for the parameter names listed in cfg.allowBlankParams.
    local newArgs = {}
    for k, v in pairs(args) do
        for i, param in ipairs(cfg.allowBlankParams or {}) do
            if v ~= '' or k == param then
                newArgs[k] = v
            end
        end
    end
    return newArgs
end

function box:setBoxParameters(cfg, args)
    -- Get type data.
    self.type = args.type
    local typeData = cfg.types[self.type]
    self.invalidType = self.type and not typeData and true or false
    typeData = typeData or cfg.types[cfg.default]
    self.typeClass = typeData.class
    self.typeImage = typeData.image

    -- Find if the box has been wrongly substituted.
    if cfg.substCheck and args.subst == 'SUBST' then
        self.isSubstituted = true
    end

    -- Find whether we are using a small message box.
    self.isSmall = cfg.allowSmall and (args.small == 'yes' or args.small == true) and true or false

    -- Add attributes, classes and styles.
    self.id = args.id
    self:addClass(cfg.usePlainlinksParam and yesno(args.plainlinks or true) and 'plainlinks')
    for _, class in ipairs(cfg.classes or {}) do
        self:addClass(class)
    end
    if self.isSmall then
        self:addClass(cfg.smallClass or 'mbox-small')
    end
    self:addClass(self.typeClass)
    self.style = args.style

    -- Set text style.
    self.textstyle = args.textstyle

    -- Process data for collapsible text fields. At the moment these are only used in {{ambox}}.
    self.useCollapsibleTextFields = cfg.useCollapsibleTextFields 
    if self.useCollapsibleTextFields then
        self.name = args.name
        local nameTitle = getTitleObject(name)
        self.isTemplatePage = nameTitle and title.prefixedText == ('Template:' .. nameTitle.text) and true or false

        -- Get the self.issue value.
        local sect = args.sect
        if presentButBlank(sect) then
            sect = 'This ' .. (cfg.sectionDefault or 'page')
        elseif type(sect) == 'string' then
            sect = 'This ' .. sect
        else
            sect = nil
        end
        local issue = args.issue
        issue = type(issue) == 'string' and issue or nil
        local text = args.text
        text = type(text) == 'string' and text or nil
        local issues = {}
        tinsert(issues, sect)
        tinsert(issues, issue)
        tinsert(issues, text)
        self.issue = tconcat(issues, ' ')

        -- Get the self.talk value.
        local talk = args.talk
        if presentButBlank(talk) and self.isTemplatePage then
            talk = '#'
        end
        if talk then
            -- See if the talk link exists and is for a talk or a content namespace.
            local talkTitle = getTitleObject(talk)
            if not talkTitle or not talkTitle.isTalkPage then
                -- If we couldn't process the talk page link, get the talk page of the current page.
                local success
                success, talkTitle = pcall(title.talkPageTitle, title)
                if not success then
                    talkTitle = nil
                end
            end
            if talkTitle and talkTitle.exists then
                local talkText = 'Relevant discussion may be found on'
                if talkTitle.isTalkPage then
                    talkText = format('%s [[%s|%s]].', talkText, talk, talkTitle.prefixedText)
                else
                    talkText = format('%s the [[%s#%s|talk page]].', talkText, talkTitle.prefixedText, talk)
                end
                self.talk = talkText
            end
        end

        -- Get other values.
        self.fix = args.fix
        local date = args.date
        self.date = date and format(" <small>''(%s)''</small>", date)
        if presentButBlank(self.date) and self.isTemplatePage then
            self.date = lang:formatDate('F Y')
        end
        self.info = args.info
    end

    -- Set the non-collapsible text field. At the moment this is used by all box types other than ambox,
    -- and also by ambox when small=yes.
    if self.isSmall then
        if self.useCollapsibleTextFields then
            self.text = args.smalltext or self.issue
        else
            self.text = args.smalltext or args.text
        end
    else
        self.text = args.text
    end

    -- Set the below row.
    self.below = cfg.below and args.below

    -- General image settings.
    self.imageCellDiv = not self.isSmall and cfg.imageCellDiv and true or false
    self.imageEmptyCell = cfg.imageEmptyCell
    if cfg.imageEmptyCellStyle then
        self.imageEmptyCellStyle = 'border:none;padding:0px;width:1px'
    end

    -- Left image settings.
    local imageCheckBlank = cfg.imageCheckBlank
    local imageLeft = self.isSmall and args.smallimage or args.image
    if imageLeft ~= 'none' and not imageCheckBlank or imageLeft ~= 'none' and imageCheckBlank and image ~= 'blank' then
        self.imageLeft = imageLeft
        if not imageLeft then
            local imageSize = self.isSmall and (cfg.imageSmallSize or '30x30px') or '40x40px'
            self.imageLeft = format('[[File:%s|%s|link=|alt=]]', self.typeImage or 'Imbox notice.png', imageSize)
        end
    end

    -- Right image settings.
    local imageRight = self.isSmall and args.smallimageright or args.imageright
    if not (cfg.imageRightNone and imageRight == 'none') then
        self.imageRight = imageRight
    end

    -- Add mainspace categories. At the moment these are only used in {{ambox}}.
    if cfg.allowMainspaceCategories then
        if args.cat then
            args.cat1 = args.cat
        end
        self.catNums = getArgNums(args, 'cat')
        if args.category then
            args.category1 = args.category
        end
        self.categoryNums = getArgNums(args, 'category')
        self.categoryParamNums = union(self.catNums, self.categoryNums)
        -- The following is roughly equivalent to the old {{Ambox/category}}.
        local date = args.date
        date = type(date) == 'string' and date
        local preposition = 'from'
        for _, num in ipairs(self.categoryParamNums) do
            local mainCat = args['cat' .. tostring(num)] or args['category' .. tostring(num)]
            local allCat = args['all' .. tostring(num)]
            mainCat = type(mainCat) == 'string' and mainCat
            allCat = type(allCat) == 'string' and allCat
            if mainCat and date then
                local catTitle = format('%s %s %s', mainCat, preposition, date)
                self:addCat('main', catTitle)
                catTitle = getTitleObject('Category:' .. catTitle)
                if not catTitle or not catTitle.exists then
                    self:addCat('main', 'Articles with invalid date parameter in template')
                end
            elseif mainCat and not date then
                self:addCat('main', mainCat)
            end
            if allCat then
                self:addCat('main', allCat)
            end
        end
    end

    -- Add template-namespace categories.
    self.isTemplatePage = type(self.name) == 'string' and title.prefixedText == ('Template:' .. self.name)
    if cfg.templateCategory then
        if self.name then
            if self.isTemplatePage then
                self:addCat('template', cfg.templateCategory)
            end
        elseif not self.title.isSubpage then
            self:addCat('template', cfg.templateCategory)
        end
    end
    
    -- Add template error category.
    if cfg.templateErrorCategory then
        local templateErrorCategory = cfg.templateErrorCategory
        local templateCat, templateSort
        if not self.name and not self.title.isSubpage then
            templateCat = templateErrorCategory
        elseif type(self.name) == 'string' and title.prefixedText == ('Template:' .. name) then
            local paramsToCheck = cfg.templateErrorParamsToCheck or {}
            local count = 0
            for i, param in ipairs(paramsToCheck) do
                if not args[param] then
                    count = count + 1
                end
            end
            if count > 0 then
                templateCat = templateErrorCategory
                templateSort = tostring(count)
            end
            if self.categoryNums and #self.categoryNums > 0 then
                templateCat = templateErrorCategory
                templateSort = 'C'
            end
        end
        self:addCat('template', templateCat, templateSort)
    end

    -- Categories for all namespaces.
    if self.invalidType then
        local allSort = (nsid == 0 and 'Main:' or '') .. title.prefixedText
        self:addCat('all', 'Wikipedia message box parameter needs fixing', allSort)
    end
    if self.isSubstituted then
        self:addCat('all', 'Pages with incorrectly substituted templates')
    end

    -- Convert category tables to strings and pass them through [[Module:Category handler]].
    self.categories = categoryHandler{
        main = tconcat(self.mainCats or {}),
        template = tconcat(self.templateCats or {}),
        all = tconcat(self.allCats or {}),
        nocat = args.nocat,
        demospace = self.demospace and args.demospace or nil,
        page = self.pageTitle and pageTitle.prefixedText or nil
    }
end

function box:export()
    local root = htmlBuilder.create()

    -- Add the subst check error.
    if self.isSubstituted and self.name then
        root
            .tag('b')
                .addClass('error')
                .wikitext(format(
                    'Template <code>%s%s%s</code> has been incorrectly substituted.',
                    mw.text.nowiki('{{'), self.name, mw.text.nowiki('}}')
                ))
    end

    -- Create the box table.
    local boxTable = root.tag('table')
    boxTable
        .attr('id', self.id)
    for i, class in ipairs(self.classes or {}) do
        boxTable
            .addClass(class)
    end
    boxTable
        .cssText(self.style)
        .attr('role', 'presentation')

    -- Add the left-hand image.
    local row = boxTable.tag('tr')
    if self.imageLeft then
        local imageLeftCell = row.tag('td').addClass('mbox-image')
        if self.imageCellDiv then
            -- If we are using a div, redefine imageLeftCell so that the image is inside it.
            -- Not sure why only some box types use divs, but it probably has something to do
            -- with that style="width: 52px;". @TODO: find out exactly what this does and fix this comment.
            imageLeftCell = imageLeftCell.tag('div').css('width', '52px') 
        end
        imageLeftCell
            .wikitext(self.imageLeft)
    elseif self.imageEmptyCell then
        -- Some message boxes define an empty cell if no image is specified, and some don't.
        -- The old template code in templates where empty cells are specified gives the following hint:
        -- "No image. Cell with some width or padding necessary for text cell to have 100% width."
        row.tag('td')
            .addClass('mbox-empty-cell') 
            .cssText(self.imageEmptyCellStyle)
    end

    -- Add the text.
    local textCell = row.tag('td').addClass('mbox-text')
    if self.useCollapsibleTextFields then
        -- The message box uses advanced text parameters that allow things to be collapsible. At the
        -- moment, only ambox uses this.
        textCell
            .cssText(self.textstyle)
        local textCellSpan = textCell.tag('span')
        textCellSpan
            .addClass('mbox-text-span')
            .wikitext(self.issue)
        if not isSmall then
            textCellSpan
                .tag('span')
                    .addClass('hide-when-compact')
                    .wikitext(self.talk and ' ' .. self.talk)
                    .wikitext(self.fix and ' ' .. self.fix)
        end
        textCellSpan
            .wikitext(self.date and ' ' .. self.date)
        if not isSmall then
            textCellSpan
                .tag('span')
                    .addClass('hide-when-compact')
                    .wikitext(self.info and ' ' .. self.info)
        end
    else
        -- Default text formatting - anything goes.
        textCell
            .cssText(self.textstyle)
            .wikitext(self.text)
    end

    -- Add the right-hand image.
    if self.imageRight then
        local imageRightCell = row.tag('td').addClass('mbox-imageright')
        if not self.imageCellDiv then
            imageRightCell = imageRightCell.tag('div').css('width', '52px') -- If we are using a div, redefine imageRightCell so that the image is inside it.
        end
        imageRightCell
            .wikitext(self.imageRight)
    end

    -- Add the below row.
    if self.below then
        boxTable.tag('tr')
            .tag('td')
                .attr('colspan', self.imageRight and '3' or '2')
                .addClass('mbox-text')
                .cssText(self.textstyle)
                .wikitext(self.below)
    end

    -- Add error message for invalid type parameters.
    if self.invalidType then
        root
            .tag('div')
                .addClass('error')
                .css('text-align', 'center')
                .wikitext(format('This message box is using an invalid type parameter (<code>type=%s</code>) and needs fixing.', self.type or ''))
    end

    -- Add categories.
    root
        .wikitext(self.categories)

    return tostring(root)
end

local function makeBox(boxType, args)
    box:setTitle(args)
    local cfg = box:getConfig(boxType)
    args = box:removeBlankArgs(cfg, args)
    box:setBoxParameters(cfg, args)
    return box:export()
end

local function makeWrapper(boxType)
    return function (frame)
        -- If called via #invoke, use the args passed into the invoking
        -- template, or the args passed to #invoke if any exist. Otherwise
        -- assume args are being passed directly in from the debug console
        -- or from another Lua module.
        local args
        if frame == mw.getCurrentFrame() then
            args = frame:getParent().args
            for k, v in pairs(frame.args) do
                args = frame.args
                break
            end
        else
            args = frame
        end
        return makeBox(boxType, args)
    end
end

return {
    box = box,
    makeBox = makeBox,
    mbox = makeWrapper('mbox'),
    ambox = makeWrapper('ambox'),
    cmbox = makeWrapper('cmbox'),
    fmbox = makeWrapper('fmbox'),
    imbox = makeWrapper('imbox'),
    ombox = makeWrapper('ombox'),
    tmbox = makeWrapper('tmbox')
}