local dir = require "opendirectory"

app.on('init', function()
  print("scanning experiences (this make take a while..)")
  app.opts.plugin_diskscan_dirname = app.opts.plugin_diskscan_dir:gsub("^[.]?[/]?","")
  app.plugin.diskscan.scan(app.opts.plugin_diskscan_dir)
end)

-- this registers the plugin UI /funcs
return {
  name = "Local Content",
  info = '',
  opts = {
    { 
      key='app.opts.plugin_diskscan_dir',
      title='Directory',
      info="Directory to scan for experiences (use '.' for current) ",
      default="./myverse", 
      values=''
    }
  },
  shouldHideFile = function(name)
    return  name == ".."    -- parent
        or name == "util"   -- repository 
        or name:match("^%.") -- hidden
        or name == "src"    -- repository
        or name == "result" -- repository
  end,

  scan = function(scandir)
    local me = app.plugin.diskscan
    local seen = {symlinks={}}
    -- ensure rootdir as experience
    app.cache.items[ scandir ] = {
      path = scandir,
      url = "/" .. util.stripPath(scandir),
      name = scandir:gsub(".*/",""),
      title = scandir:gsub(".*/",""),
      file = { ino = scandir },
      id = scandir
    }
    me.scanDir(scandir, nil, seen )
    -- deal with (circular) symlinks
    foreach( seen.symlinks, function(ino,experience)
      if not me.shouldHideFile(experience.name) then
        local refItem   = seen[experience.id_target]
        if refItem then 
          print("ℹ️ ".. experience.path )
          print("✅     └─ plugin/diskscan: detected symlink..creating portal")
          experience.file = refItem.file
          experience.portal = refItem
          app.pub("scan_experience", nil, experience)
          app.cache.items[experience.id] = experience
        end
      end 
    end)
    -- cleanup file handles
    foreach( app.cache.items, function(k,v)
      -- remove file attributes (which are closed already)
      v.file.stat = nil
      v.file.attr = nil
      v.file.state = nil
    end)
  end,

  scanDir = function(scandir,parent,seen)
    local me = app.plugin.diskscan
    parent = parent or app.cache.items[scandir]
    -- scan dirs
    local scanFile = function(path,stat,state,name,kind,ino,off,attr,fullpath)

      local experience = {
        path = fullpath,
        url = "/" .. util.stripPath(fullpath),
        name = name,
        title = name,
        sidecarfile = {},
        thumbnail = '',
        tag  = {},
        id = ino,
        file = {stat=stat,state=state,kind=kind,ino=ino,off=off,attr=attr,fullpath=fullpath,name=name,path=path}
      }
      experience.parent = parent 

      -- check for thumbnail
      local thumbExt = {"png","jpg","webp"}
      foreach( thumbExt, function(k,ext)
        local thumbnailFile = fullpath .. "/" .. name .. "." .. ext 
        if util.fileExist( thumbnailFile ) then 
          print("✅     └─ plugin/diskscan: detected .".. ext:lower() .. " thumbnail file")
          experience.thumbnail = "/" .. util.stripPath(thumbnailFile)
        end
      end)

      if seen[ino] then return end  -- dont process dirs/files twice

      if (kind == unix.DT_LNK) then 
        local stat, err = unix.stat(fullpath)
        experience.id_target = stat:ino()
        seen.symlinks[ ino ] = experience
        return
      end

      -- found directory
      if (kind == unix.DT_DIR and kind ~= unix.DT_LNK)
        and not me.shouldHideFile(name) then
        seen[ino] = experience -- prevent recursion with symlinks
        print("✅ ".. fullpath .. " " ..ino)
        experience.dir = true
        app.pub("scan_experience", nil, experience)
        app.cache.items[ino] = experience
        me.scanDir(fullpath,experience,seen,symlinks)
      end

      ---- found file
      if (kind ~= unix.DT_DIR and kind ~= unix.DT_LNK) 
        and not me.shouldHideFile(name) then
        seen[ino] = experience.file -- prevent recursion with symlinks
        trace("ℹ️ ".. fullpath)
        experience.tag.file = true
        app.pub("scan_experience_file", nil, experience)
        local size = attr:size()
      end
    end

    local dref, derr;
    dref, derr = dir.foreach( scandir, scanFile )
    if not derr then dref:close() end

  end
}