local lfs = require("lfs_ffi")
local cjson = require("cjson")

local utils = {}

-- we want to list the contents of a dir
function utils:dirlist( path )
    local files, dirs, images, audio = {}, {}, {}, {}
    for file in lfs.dir( path ) do
        local filepath = path .. "/" .. file
        local attribute = lfs.attributes( filepath, "mode" ) or "nil"
        if file ~= "." and file ~= ".." and not string.match(file, ".filepart") then
            if lfs.attributes( filepath, "mode" ) == "file" then
                if utils:match_image( file ) then
                    table.insert( images, file )
                elseif utils:match_audio( file) then
                    table.insert( audio, file )
                else
                    table.insert( files, file )
                end
            elseif lfs.attributes( filepath, "mode" ) == "directory" then
                table.insert( dirs, file )
            end
        end
    end

    table.sort( images )
    table.sort( files )
    table.sort( dirs )
    table.sort( audio )

    local stuff = {
        files = files,
        dirs = dirs,
        images = images,
        audio = audio
    }
    return stuff
end

-- open a json file and return the table
function utils:opendata( path )
    local data = io.open(path)
    if data then
        local data_file = data:read("a")
        data:close()
        local data_decode = cjson.decode(data_file)

        return data_decode
    else
        return nil
    end
end

return utils