Module:Chapters

Documentation for this module may be created at Module:Chapters/doc

-- Module:Chapters
local p = {}

function p.getChaptersList()
    local listPage = mw.title.new('Template:ChapterList')
    if not listPage then
        return {}
    end

    local content = listPage:getContent()
    if not content then
        return {}
    end

    local chapters = {}
    for number, title, date, pagecount in string.gmatch(content, "{{Chapter|number=(%d+)|title=([^|]+)|date=([^|]+)|pagecount=(%d+)}}") do
        table.insert(chapters, {number = tonumber(number), title = title, date = date, pagecount = tonumber(pagecount)})
    end

    return chapters
end

function p.getChapterDetails(chapterTitle, detail)
    local chapters = p.getChaptersList()
    for _, chapter in ipairs(chapters) do
        if chapter.title == chapterTitle then
            return chapter[detail]
        end
    end
    return nil
end

function p.getTotalChapters()
    local totalChapters = #p.getChaptersList()
    return totalChapters
end

function p.getNextChapter(chapterTitle)
    local chapters = p.getChaptersList()
    for i, chapter in ipairs(chapters) do
        if chapter.title == chapterTitle and i < #chapters then
            return chapters[i + 1].title
        end
    end
    return nil
end

function p.getPreviousChapter(chapterTitle)
    local chapters = p.getChaptersList()
    for i, chapter in ipairs(chapters) do
        if chapter.title == chapterTitle and i > 1 then
            return chapters[i - 1].title
        end
    end
    return nil
end

function p.formatDate(date)
    local year, month, day = string.match(date, "(%d+)%-(%d+)%-(%d+)")
    if year and month and day then
        return string.format("{{Start date|%s|%s|%s}}", year, month, day)
    else
        return date
    end
end

function p.infoboxChapter(frame)
    local chapterTitle = frame.args.chapter_title or mw.title.getCurrentTitle().text
    local image = frame.args.image
    local caption = frame.args.caption

    local chapter_no = p.getChapterDetails(chapterTitle, "number") or "N/A"
    local date = p.getChapterDetails(chapterTitle, "date") or "N/A"
    local pagecount = p.getChapterDetails(chapterTitle, "pagecount") or "N/A"
    local total_chapters = p.getTotalChapters() or "N/A"
    local next_chapter = p.getNextChapter(chapterTitle) or "N/A"
    local prev_chapter = p.getPreviousChapter(chapterTitle) or "N/A"

    local infobox = mw.html.create('table')
    infobox:addClass('infobox')

    -- Add title as heading
    infobox:tag('tr')
        :tag('th')
            :attr('colspan', '2')
            :css('text-align', 'center')
            :css('font-size', '125%')
            :css('padding', '5px')
            :wikitext(chapterTitle)
            :done()
        :done()
    
    -- Optionally add image with standard size and caption
    if image and image ~= "" then
        infobox:tag('tr')
            :tag('td')
                :attr('colspan', '2')
                :css('text-align', 'center')
                :wikitext('[[File:' .. image .. '|250px|thumb|center|' .. (caption or '') .. ']]')
                :done()
            :done()
    end

    -- Add chapter number and total chapters on the same line
    local chapter_info = string.format("%s of %s [[Template:ChapterList|(list of chapters)]]", chapter_no, total_chapters)
    infobox:tag('tr')
        :tag('th'):wikitext('Chapter'):done()
        :tag('td'):wikitext(chapter_info):done()
        :done()

    infobox:tag('tr')
        :tag('th'):wikitext('Date'):done()
        :tag('td'):wikitext(p.formatDate(date)):done()
        :done()

    infobox:tag('tr')
        :tag('th'):wikitext('Page count'):done()
        :tag('td'):wikitext(pagecount):done()
        :done()

    -- Add chapter navigation heading
    infobox:tag('tr')
        :tag('th')
            :attr('colspan', '2')
            :css('text-align', 'center')
            :css('font-size', '110%')
            :css('padding', '5px')
            :css('background-color', '#f0f0f0')
            :wikitext('Chapter navigation')
            :done()
        :done()

    -- Add chapter navigation links in separate columns
    local nav_row = infobox:tag('tr')
    nav_row:tag('td')
        :css('text-align', 'left')
        :wikitext(prev_chapter ~= "N/A" and string.format("[[%s:%s|← %s]]", mw.title.getCurrentTitle().nsText, prev_chapter, prev_chapter) or "← Previous")
        :done()
    nav_row:tag('td')
        :css('text-align', 'right')
        :wikitext(next_chapter ~= "N/A" and string.format("[[%s:%s|%s →]]", mw.title.getCurrentTitle().nsText, next_chapter, next_chapter) or "Next →")
        :done()
    nav_row:done()

    -- Return the complete wikitext
    return frame:preprocess(tostring(infobox))
end

return p