编辑“︁Module:PageSummary”︁

local p = {}

-- 剥离 [[File:]] [[文件:]] 等，避免污染摘要
local function stripImages(text)
    if not text or text == "" then return "" end
    
    text = mw.ustring.gsub(text, "%[%[(文件|Image|图像):", "[[File:")
    text = mw.ustring.gsub(text, "%[%[(分类|Category):", "[[Category:")
    
    local out = {}
    local i = 1
    local len = #text
    
    while i <= len do
        if text:byte(i) == 91 and text:byte(i+1) == 91 then
            local chunk = text:sub(i, i+15)
            if chunk:match("^%[%[File:") or chunk:match("^%[%[Category:") then
                local depth = 1
                local j = i + 2
                while j <= len and depth > 0 do
                    if text:byte(j) == 91 and text:byte(j+1) == 91 then
                        depth = depth + 1
                        j = j + 2
                    elseif text:byte(j) == 93 and text:byte(j+1) == 93 then
                        depth = depth - 1
                        j = j + 2
                    else
                        j = j + 1
                    end
                end
                i = j
            else
                table.insert(out, text:sub(i, i+1))
                i = i + 2
            end
        else
            table.insert(out, text:sub(i, i))
            i = i + 1
        end
        if i > 1200 then break end
    end
    
    return table.concat(out)
end

-- 清理函数，全用 mw.ustring.gsub
local function cleanFinal(text)
    if not text or text == "" then return "" end
    
    text = mw.ustring.gsub(text, "{{[^{}]*}}", "")
    text = mw.ustring.gsub(text, "<ref.-</?ref[^>]*>", "")
    text = mw.ustring.gsub(text, "<!%-%-.-%-%->", "")
    text = mw.ustring.gsub(text, "\n==+[^=]+==+", " ")
    text = mw.ustring.gsub(text, "\n%s*[*#:;]+", " ")
    text = mw.ustring.gsub(text, "%s*\n%s*", " ")
    text = mw.ustring.gsub(text, "%s+", " ")
    
    return mw.text.trim(text)
end

function p.getSummaryAndImage(frame)
    local pageName = mw.text.trim(frame.args[1] or "")
    if pageName == "" then return "" end
    
    local title = mw.title.new(pageName)
    if not title or not title.exists then return "" end
    
    local content = title:getContent()
    if not content or content == "" then return "" end
    
    -- 关键：清洗无效 UTF-8，避免 gsub 报错
    content = mw.ustring.gsub(content, "[\128-\191][\128-\191]*[^\128-\191]", "�")  -- 替换常见无效序列
    content = mw.text.decode(content) or content  -- 尝试解码实体
    
    local rawExcerpt = mw.ustring.sub(content, 1, 800) or ""
    
    -- 提取第一张图片（find + 手动截取，更可靠）
    local firstImage = nil
    local prefixes = {"File:", "文件:"}
    for _, prefix in ipairs(prefixes) do
        local pattern = "%[%[" .. prefix
        local start = mw.ustring.find(rawExcerpt, pattern)
        if start then
            local pipePos = mw.ustring.find(rawExcerpt, "|", start)
            local endPos = mw.ustring.find(rawExcerpt, "%]%]", start)
            local boundary = pipePos or endPos
            if boundary then
                local candidate = mw.ustring.sub(rawExcerpt, start + #pattern + 1, boundary - 1)
                candidate = mw.text.trim(candidate)
                if candidate ~= "" and mw.ustring.find(candidate, "%.") then  -- 有扩展名才算图片
                    firstImage = prefix .. candidate
                    break
                end
            end
        end
    end
    
    local step1     = stripImages(rawExcerpt) or ""
    local cleanText = cleanFinal(step1) or ""
    
    -- 摘要截断：全程 ustring + 安全断点
    local targetLen = 120
    local summary = cleanText
    
    local ulen = mw.ustring.len(summary) or 0
    if ulen > targetLen then
        local temp = mw.ustring.sub(summary, 1, targetLen + 20)
        
        local breakPos = nil
        for i = mw.ustring.len(temp), 1, -1 do
            local char = mw.ustring.sub(temp, i, i)
            if char:match("[ %s，。！？；：,…、]") then
                breakPos = i
                break
            end
        end
        
        if breakPos and breakPos > targetLen - 30 then
            summary = mw.ustring.sub(temp, 1, breakPos)
        else
            summary = mw.ustring.sub(temp, 1, targetLen)
        end
        
        summary = mw.text.trim(summary) .. "…"
    else
        summary = mw.text.trim(summary)
    end
    
    -- HTML 输出
    local container = mw.html.create('div')
        :css('margin-bottom', '25px')
        :css('display', 'flow-root')
    
    container:tag('div')
        :css('font-size', '1.3em')
        :css('font-weight', 'bold')
        :css('margin-bottom', '6px')
        :css('border-bottom', '1px solid #eee')
        :wikitext('[[' .. pageName .. ']]')
    
    local textDiv = container:tag('div')
        :css('line-height', '1.6')
        :css('color', '#222')
        :css('font-size', '14px')
    
    if firstImage and firstImage ~= "" then
        textDiv:wikitext('[[' .. firstImage .. '|120px|right|link=' .. pageName .. ']]')
    end
    
    textDiv:wikitext(summary)
    
    return tostring(container)
end

return p