local function GetTextFromUrl(address)
  local fileHandle = http.get(address);
  if fileHandle == nil then
    error("Could not execute  \"get\"  on address: "..address)
  end
  local text = fileHandle.readAll();
  fileHandle.close();
  return text;
end

local function Save(name,data)
  local file = fs.open(name,"w")
  if not file then
    error("File "..name.." could not be opened");
  end
  file.write(data)
  file.close()
end

local function GetLastName(str)
  local lastsl = string.match(str,'^.*()/');
  if string.len(str) == lastsl then
    str = str:sub(1, -2)
    lastsl = string.match(str,'^.*()/');
  end
  return string.sub(str,lastsl+1);
end

function SaveFileFromURL(address,newName,path)
  if not newName then
    newName = GetLastName(address);
  end
  if path then
    if string.len(path) ~= string.match(path,'^.*()/') then
      path = path .. "/";
    end
    newName = path .. newName;
  end
  print("Saving file "..address.. " as ".. newName)
  Save(newName,GetTextFromUrl(address));
  return;
end

function Walker(url,path)
  print("");
  print("Checking directory "..url)
  local resp = GetTextFromUrl(url)
  local jsonresp = Json.decode(resp);
  local childs = jsonresp.values;
  for i=1,#childs do
    local child = childs[i];
    if child.type == "commit_directory" then
      Walker(child.links.self.href)
    elseif child.type == "commit_file" then
      SaveFileFromURL(child.links.self.href,path..child.path);
    else
      print("Unknown type "..tostring(child.type))
    end
  end
end

local mode,address,newName = ...;
if mode ~= nil then
  if mode ~= "file" and mode ~= "dir" then
    error("Invalid mode")
  end
  
  if not http.checkURL(address) then
    error("Invalid URL")
  end
  
  if mode == "file" then
    SaveFileFromURL(address,newName);
  else
    if Json == nil then
      Save("Json",GetTextFromUrl("https://api.bitbucket.org/2.0/repositories/Hiranus0/mcrestapi/src/master/ComputerCraft/Lua/API/Json.lua"));
      os.loadAPI("Json");
    end
    Walker(address,newName);
  end
end