Module:Library citation

local p = {}

require("Module:Auxiliary functions")

local function checkset(var)
    local rtn = nil
    if not (var == nil or var == '') then
        rtn = var
    end
    return rtn
end

-- local function is_set(var)
--  return not (var == nil or var == '')
-- end

local function removeApostrophes(str)
    return str:gsub("[\"'%`]", "")
end

local function compareStrings(a,b)
    local stringA = removeApostrophes(a):lower()
    local stringB = removeApostrophes(b):lower()
    return stringA < stringB
end

function listOfWorks(author) 
    local newMethod = mw.getCurrentFrame():callParserFunction("#dpl","namespace=Library","titleregexp=" .. author .. "/[^/]+$","format=,%TITLE%\\n")
    local catMethod = mw.getCurrentFrame():callParserFunction("#dpl","namespace=Library","category=Library works by " .. author ,"format=,%TITLE%\\n")
    local list = ""
    if string.len(newMethod) > string.len(catMethod) then
        list = newMethod
    else
        list = catMethod
    end
    titleTable = mw.text.split(string.gsub(mw.text.trim(list),author .. "/",""),"\n")
    linkTable=mw.text.split(mw.text.trim(list),"\n")
    for i,v in ipairs(linkTable) do
        linkTable[i] = "Library:" .. v
    end
    table.sort(linkTable,compareStrings)
    table.sort(titleTable,compareStrings)
    return {links=linkTable,titles=titleTable}
end

function getDataFromTitle(title)
    local rawString = mw.getCurrentFrame():callParserFunction("#dpl","namespace=Library","title=" .. title,"mode=userformat","include={Library work}:title:author:published_date:source")
    local title,author,published_date,source = rawString:match("^(.-)%s|(.-)%s|(.-)%s|(.-)$")
    local year = ""
    if is_set(published_date) then
        year = published_date:match("%d%d%d%d")
    end
    return title,author,year,source
end

function getDataFromLink(link)
    local str = link
    local result = str:match("https?://[^/]+/wiki/(.*)")
    if result then
        str = result
    end
    str = str:gsub("^Library:", "")
    str = str:gsub(" ", "_")  -- Ensure underscores for page names
    
    return getDataFromTitle(str), str
end

local function wikilinkFromAuthor(author)
    if mw.getCurrentFrame():callParserFunction('#ifexist',author,true) == "1" then
        return "[[" .. author .. "]]"
    end
    return author
end

function p.cite(frame)
    local parentFrame = frame:getParent()
    local link = checkset(parentFrame.args.link)
    local author = nil
    local quote = checkset(parentFrame.args.quote)
    local pageName = nil
    local source = nil
    
    if is_set(link) then
        title, author, year, source, pageName = getDataFromLink(link)
    end
    
    local render = ""
    
    if is_set(author) then
        render = render .. wikilinkFromAuthor(author)
    end
    if is_set(year) then
        render = render .. " (" .. year .. ")."
    end
    if is_set(title) and is_set(pageName) then
        render = render .. " ''[[Library:" .. pageName .. "|" .. title .. "]]''."
    end
    if is_set (quote) then
        quote = string.gsub(quote,"\n","<br>")
        quote = "“" .. quote .. "”"
        local div = mw.html.create ('div')
        div
        :attr("style", "width:80%; margin-left:10%;")
        :wikitext(quote)
        local br = mw.html.create ('br', selfClosing)
        render = italics(tostring(div)) .. tostring(br) .. render
    end
    
    -- Store source in hidden metadata
    if is_set(source) then
        render = render .. '<span style="display:none">Source: ' .. source .. '</span>'
    end
    
    return render
end

return p