local util = require("util")

-- todo: clean up code once the code below is no longer in flux 

return {

  middleware = function(req,res,next)
    local rootpath = "/" .. app.opts.plugin_diskscan_dirname 
    local urlpath  = req.url
    local isroot   = urlpath == "/" or urlpath:match("^"..rootpath.."[/]?$")
    res.items      = {}
    res.template   = res.template or 'page/dir.html'
    local isdir    = urlpath:sub(-1) == "/" 
    local nslashes = util.countChar('/',urlpath)
    local match    = function(a,b) return util.stripPath(a) == util.stripPath(b) end
    local urlhash  = urlpath .. util.dump( req.param )
    local referrer = util.baseURLify( (isroot and not req.param.url) and "" or urlpath )

    if (isroot or urlpath:match("^"..rootpath))
      and not urlpath:gsub(".*/",""):match("%.")  -- no regular file with extension
      then 

      local redirect = false
      if not app.cache.url[ urlhash ] or util.count(req.params) > 0 then
        local matchpath = urlpath
        if urlpath == '/' then matchpath = rootpath end -- generate janusxr footer for root url
        foreach( app.cache.items, function(k,v)
            print("URL=" ..v.url)
          if req.authenticated or app.plugin.moderation.isAllowed(v) then 
            if v.parent then
--              trace( "path = "     .. util.stripPath(v.path) .. " " ..
--                     "parent = "  .. util.stripPath(v.parent.path) .. " " ..
--                     "matchpath = " .. util.stripPath(matchpath)
--              )
              --if match(v.path, matchpath) then -- add parent folder if any
              --res.items[ v.parent.id ] = v.parent 
              --  if match(v.parent.path, app.opts.plugin_diskscan_dir) then -- add rootfolder if needed
              --    local root = app.cache.items[ app.opts.plugin_diskscan_dir ] 
              --    res.items[ root.id ] = root
              --  end
              --end

              -- add items from dir
              if match(v.parent.path, matchpath) then 
                if v.dir or v.view3D then 
                  local parent = app.cache.items[ v.parent.id ]
                  res.items[ v.id ] = v
                  res.parent = parent
                end
                if isroot then
                  referrer = app.opts.plugin_federation_parent_url
                else
                  referrer = v.parent.parent.url
                end
              end
            end
          end
        end)

        local data = util.merge({
          janusurl = req.param.url, -- query hint to render janus.url in iframe (index.html)
          items = {},
          isroot = isroot,
          referrer = referrer, 
          parent=res.parent,
          template=res.template
        },{ opts = app.opts })
        local i = 0
        foreach( res.items, function(k,v)
          -- add extra metadata for janusxr JML (janusxr.html and dir.html)
          table.insert(data.items, util.merge({x = i*2, i = i},v) )
          i=i+1
          if v.view3D then 
            local isMarkupExperience = function(v) 
              return v.janusxr and (v.janusxr.jml or v.janusxr.wrap)
            end
            -- prioritize markup experience above binary 3D files as experience containers
            if not data.item or (isMarkupExperience(v) and not isMarkupExperience(data.item)) then
              -- update referrer url
              data.referrer = util.baseURLify(v.view3D and v.parent.parent.url or v.parent.url)
              data.item = v 
              data.title = data.item.title
              data.parent = v.parent
              data.janusurl = (v.janusxr and v.janusxr.wrap) and 
                               app.opts.baseurl .. util.stripPath(v.parent.url) 
                               or
                               app.opts.baseurl .. util.stripPath(v.url) 
              if v.janusxr and (v.janusxr.jml or v.janusxr.wrap and v.janusxr.wrap.aframe) then
                -- what to do here? no generated portals?
                data.janusxr = app.tpl( util.readfile(v.path), data )
              end
            end
          end
        end)
        if data.item then
          res.template = 'page/index.html'
        end
        app.pub("dir", nil, {res=res,data=data, urlpath=urlpath, isroot=isroot, isdir=isdir})
        if not redirect then
          app.cache.url[ urlhash ] = util.templateFile( res.template, data)
        end
      end
      if redirect then
        print("REDIRECT! " .. redirect )
        res.status(303)
        res.header('Location', redirect )
        next()
      else 
        res.status(200)
        res.header('content-type','text/html')
        res.body( app.cache.url[ urlhash ] )
        next()
      end
    else
      next()
    end
  end
}