{.used.}

import
  std/[os, options],
  stew/results,
  stew/shims/net as stewNet,
  testutils/unittests,
  confutils,
  confutils/defs,
  confutils/std/net
import
  waku/common/confutils/envvar/defs as confEnvvarDefs,
  waku/common/confutils/envvar/std/net as confEnvvarNet

type ConfResult[T] = Result[T, string]

type TestConf = object
  configFile* {.desc: "Configuration file path", name: "config-file".}:
    Option[InputFile]

  testFile* {.desc: "Configuration test file path", name: "test-file".}:
    Option[InputFile]

  listenAddress* {.
    defaultValue: parseIpAddress("127.0.0.1"),
    desc: "Listening address",
    name: "listen-address"
  .}: IpAddress

  tcpPort* {.desc: "TCP listening port", defaultValue: 60000, name: "tcp-port".}: Port

{.push warning[ProveInit]: off.}

proc load*(T: type TestConf, prefix: string): ConfResult[T] =
  try:
    let conf = TestConf.load(
      secondarySources = proc(
          conf: TestConf, sources: auto
      ) {.gcsafe, raises: [ConfigurationError].} =
        sources.addConfigFile(Envvar, InputFile(prefix))
    )
    ok(conf)
  except CatchableError:
    err(getCurrentExceptionMsg())

{.pop.}

suite "nim-confutils - envvar":
  test "load configuration from environment variables":
    ## Given
    let prefix = "test-prefix"

    let
      listenAddress = "1.1.1.1"
      tcpPort = "8080"
      configFile = "/tmp/test.conf"

    ## When
    os.putEnv("TEST_PREFIX_CONFIG_FILE", configFile)
    os.putEnv("TEST_PREFIX_LISTEN_ADDRESS", listenAddress)
    os.putEnv("TEST_PREFIX_TCP_PORT", tcpPort)

    let confLoadRes = TestConf.load(prefix)

    ## Then
    check confLoadRes.isOk()

    let conf = confLoadRes.get()
    check:
      conf.listenAddress == parseIpAddress(listenAddress)
      conf.tcpPort == Port(8080)

      conf.configFile.isSome()
      conf.configFile.get().string == configFile

      conf.testFile.isNone()