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local p = {}

local function _render(month, day, year, maxLines, frame)
    if not month or month == "" or not day or day == "" or not year or year == "" then
        return '<span class="error">Usage Error: Missing date components (Month, Day, or Year).</span>'
    end

    local pageTitle = "Update:" .. month .. " " .. day .. ", " .. year

    local titleObj = mw.title.new(pageTitle)
    if not titleObj then
        return '<span class="error">Invalid page title: ' .. pageTitle .. '</span>'
    end

    local content = titleObj:getContent()
    if not content then
        return '<span class="error">Page not found: [[' .. pageTitle .. ']]</span>'
    end

    local notesRaw = content:match("|%s*notes%s*=(.*)")
    if not notesRaw then
        return '<span class="error">No notes parameter found on [[' .. pageTitle .. ']]</span>'
    end

    notesRaw = notesRaw:gsub("%s*}}%s*$", "")
    notesRaw = mw.text.trim(notesRaw)

    if notesRaw == "" then
        return ""
    end

    local maxHeight = maxLines * 1.7

    local html = string.format(
        '<div style="flex:1; min-height:0; overflow-y:auto; padding:14px 18px; font-family: sans-serif; font-size:0.92em; line-height:1.7;">\n__NOEDITSECTION__\n%s\n</div>',
        frame:preprocess(notesRaw)
    )

    return html
end

function p.render(frame)
    local args = frame.args
    if not args[1] then args = frame:getParent().args end
    
    local month    = args[1]
    local day      = args[2]
    local year     = args[3]
    local maxLines = tonumber(args[4]) or 10

    return _render(month, day, year, maxLines, frame)
end

function p.drawWidget(frame)
    local parentArgs = frame:getParent().args
    local args = frame.args
    
    local month  = parentArgs.month or args.month or ""
    local day    = parentArgs.day or args.day or ""
    local year   = parentArgs.year or args.year or ""
    local height = tonumber(parentArgs.height or args.height) or 15
    local lang   = parentArgs.lang or args.lang or ""

    month = mw.text.trim(month)
    day   = mw.text.trim(day)
    year  = mw.text.trim(year)

    -- Native Lua loading: Bypasses frame:preprocess entirely
    local latestUpdate = require("Module:LatestUpdate")

    if month == "" then month = latestUpdate.month() end
    if day == ""   then day   = latestUpdate.day() end
    if year == ""  then year  = latestUpdate.year() end

    -- Execute days_since_text natively by passing a mock frame table
    local daysSinceText = latestUpdate.days_since_text({ args = { lang = lang } })
    
    -- Standard template expansions for structural layout
    local translateText = frame:expandTemplate{ title = "Translate", args = { "Latest Update" } }
    local updateLink    = frame:expandTemplate{ title = "Update link", args = { month, day, year } }

    -- Fetch the inner excerpt HTML
    local excerptBody = _render(month, day, year, height, frame)

    -- Build optimized wrapper HTML layout
    local html = mw.html.create("div")
        :addClass("nav-bg update-excerpt")

    -- Header Segment
    html:tag("div")
        :addClass("update-excerpt__header")
        :wikitext(translateText .. ": " .. updateLink .. " (" .. daysSinceText .. ")")

    -- Append Excerpt Body Content
    html:wikitext(excerptBody)

    -- Footer Segment
    local footer = html:tag("div")
        :addClass("update-excerpt__footer nav-bg")
        
    footer:tag("span")
        :addClass("update-excerpt__readmore")
        :wikitext("[[Update:" .. month .. " " .. day .. ", " .. year .. "|Read more]]")

    return tostring(html)
end

return p