client.lua

local proxyclient = {}

proxyclient.BASE_URL = "http://localhost:3000"

function proxyclient.get(path)
  local requestUrl = proxyclient.BASE_URL .. path
  local okCheck, checkErr = http.checkURL(requestUrl)
  if okCheck == false then
    return nil, "URL blocked by http rules: " .. tostring(checkErr), requestUrl
  end
  local response, err, failingResponse = http.get(requestUrl)
  if not response then
    local status, body = nil, nil
    if failingResponse then
      status = failingResponse.getResponseCode()
      body = failingResponse.readAll()
      failingResponse.close()
    end
    local detail = string.format(
      "GET %s -> %s%s",
      requestUrl,
      tostring(err),
      body and (" | body: " .. body) or ""
    )
    return nil, detail, requestUrl, status
  end
  local body = response.readAll()
  local headers = response.getResponseHeaders()
  local status = response.getResponseCode()
  response.close()
  if not body or body == "" then
    return nil, "Empty response from proxy (status " .. tostring(status) .. ")", requestUrl
  end
  return body, nil, requestUrl, status, headers
end

local function buildConvertUrl(imageUrl, width, height, format)
  local encoded = textutils.urlEncode(imageUrl)
  return string.format(
    "/convert?url=%s&width=%d&height=%d&format=%s",
    encoded, width, height, format
  )
end

function proxyclient.fetch(imageUrl, width, height, format)
  format = format or "nfp"
  return proxyclient.get(buildConvertUrl(imageUrl, width, height, format))
end

function proxyclient.fetchAndDecode(imageUrl, width, height, format)
  local body, err, _, _, headers = proxyclient.fetch(imageUrl, width, height, format)
  if not body then
    return nil, err
  end
  if format == "blit" then
    local rows, jsonErr = textutils.unserialiseJSON(body)
    if not rows then
      return nil, "Failed to parse blit JSON: " .. tostring(jsonErr)
    end
    return { kind = "blit", rows = rows, headers = headers }
  else
    local ok, image = pcall(paintutils.parseImage, body)
    if not ok or not image then
      return nil, "Failed to parse NFP image"
    end
    return { kind = "nfp", image = image, headers = headers }
  end
end

function proxyclient.aghpbRandom(category, width, height, format)
  format = format or "nfp"
  local path = string.format("/aghpb/random?width=%d&height=%d&format=%s", width, height, format)
  if category then
    path = path .. "&category=" .. textutils.urlEncode(category)
  end
  return proxyclient.get(path)
end

return proxyclient