local _tl_compat; if (tonumber((_VERSION or ''):match('[%d.]*$')) or 0) < 5.3 then local p, m = pcall(require, 'compat53.module'); if p then _tl_compat = m end end; local ipairs = _tl_compat and _tl_compat.ipairs or ipairs; local pairs = _tl_compat and _tl_compat.pairs or pairs; local download = {}


local path = require("luarocks.path")
local fetch = require("luarocks.fetch")
local search = require("luarocks.search")
local queries = require("luarocks.queries")
local fs = require("luarocks.fs")
local dir = require("luarocks.dir")
local util = require("luarocks.util")

local function get_file(filename)
   local protocol, pathname = dir.split_url(filename)
   if protocol == "file" then
      local ok, err = fs.copy(pathname, fs.current_dir(), "read")
      if ok then
         return pathname
      else
         return nil, err
      end
   else

      local ok, err = fetch.fetch_url(filename)
      return ok, err
   end
end

function download.download_all(arch, name, namespace, version)
   local substring = (name == "")
   local query = queries.new(name, namespace, version, substring, arch)
   local search_err

   local results = search.search_repos(query)
   local has_result = false
   local all_ok = true
   local any_err = ""
   for rname, result in pairs(results) do
      for rversion, items in pairs(result) do
         for _, item in ipairs(items) do

            if item.arch ~= "installed" then
               has_result = true
               local filename = path.make_url(item.repo, rname, rversion, item.arch)
               local ok, err = get_file(filename)
               if not ok then
                  all_ok = false
                  any_err = any_err .. "\n" .. err
               end
            end
         end
      end
   end

   if has_result then
      return all_ok, any_err
   end

   local rock = util.format_rock_name(name, namespace, version)
   return nil, "Could not find a result named " .. rock .. (search_err and ": " .. search_err or ".")
end

function download.download_file(arch, name, namespace, version, check_lua_versions)
   local query = queries.new(name, namespace, version, false, arch)
   local search_err

   local url
   url, search_err = search.find_rock_checking_lua_versions(query, check_lua_versions)
   if url then
      return get_file(url)
   end

   local rock = util.format_rock_name(name, namespace, version)
   return nil, "Could not find a result named " .. rock .. (search_err and ": " .. search_err or ".")
end

return download