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  = GetPath()
    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
    if urlpath == "/" 
      or urlpath:match("^"..rootpath) 
      and not urlpath:gsub(".*/",""):match("%.") then

      local redirect = false
      if not app.cache.url[ urlpath ] then
        local matchpath = urlpath
        if urlpath == '/' then matchpath = rootpath end -- generate janusxr footer for root url
        foreach( app.cache.items, function(k,v)
          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 -- show parent folder if any
              local parent = app.cache.items[ v.parent.id ]
              if v.portal then 
                redirect = v.portal.url
              end
              if match(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 
              local parent = app.cache.items[ v.parent.id ]
              res.items[ v.id ] = v
              res.parent = parent
            end

          end
        end)
        local data = util.merge({
          html_items='', 
          items = {},
          parent=res.parent
        },{ opts = app.opts })
        local i = 0
        foreach( res.items, function(k,v)
          -- position items for janusxr JML (dir.html)
          table.insert(data.items, util.merge({x = i*2, i = i},v) )
          i=i+1
          if v.view3D then 
            data.item = v 
            data.title = data.item.title
            local port = ':' .. GetPort()
            if port == 80 then port = '' end
            data.url = GetScheme() .. '://' .. GetHost() .. port ..  v.url 
          end
        end)
        if data.item then
          res.template = 'page/index.html'
        end
        app.cache.url[ urlpath ] = util.templateFile( res.template, data)
      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[ urlpath ] )
        next()
      end
    else
      next()
    end
  end
}