/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package runtime.actionContainers

import spray.json.DefaultJsonProtocol._
import spray.json._
import common.WskActorSystem
import actionContainers.{ActionContainer, BasicActionRunnerTests}
import actionContainers.ActionContainer.withContainer
import actionContainers.ResourceHelpers.ZipBuilder

abstract class PythonActionContainerTests extends BasicActionRunnerTests with WskActorSystem {

  val imageName: String

  /** actionLoop does not return an error code on failed run */
  lazy val errorCodeOnRun = true

  override def withActionContainer(env: Map[String, String] = Map.empty)(code: ActionContainer => Unit) = {
    withContainer(imageName, env)(code)
  }

  behavior of imageName

  override val testNoSourceOrExec = TestConfig("")
  override val testNoSource = TestConfig("", hasCodeStub = true)

  override val testNotReturningJson =
    TestConfig("""
        |def main(args):
        |    return "not a json object"
      """.stripMargin)

  override val testInitCannotBeCalledMoreThanOnce =
    TestConfig("""
        |def main(args):
        |    return args
      """.stripMargin)

  override val testEntryPointOtherThanMain =
    TestConfig(
      """
        |def niam(args):
        |  return args
      """.stripMargin,
      main = "niam")

  override val testEcho =
    TestConfig("""
        |from __future__ import print_function
        |import sys
        |def main(args):
        |    print('hello stdout')
        |    print('hello stderr', file=sys.stderr)
        |    return args
      """.stripMargin)

  override val testUnicode =
    TestConfig("""
        |# encoding: utf-8
        |def main(args):
        |    sep = args['delimiter']
        |    str = sep + u" ☃ " + sep
        |    print(str)
        |    return {"winter" : str }
      """.stripMargin.trim)

  override val testEnv =
    TestConfig("""
        |import os
        |def main(dict):
        |    return {
        |       "api_host": os.environ['__OW_API_HOST'],
        |       "api_key": os.environ['__OW_API_KEY'],
        |       "namespace": os.environ['__OW_NAMESPACE'],
        |       "action_name": os.environ['__OW_ACTION_NAME'],
        |       "action_version": os.environ['__OW_ACTION_VERSION'],
        |       "activation_id": os.environ['__OW_ACTIVATION_ID'],
        |       "deadline": os.environ['__OW_DEADLINE']
        |    }
      """.stripMargin.trim)

  override val testEnvParameters =
    TestConfig("""
        |import os
        |somevar = os.environ['SOME_VAR']
        |another = os.environ['ANOTHER_VAR']
        |
        |def main(dict):
        |    global somevar
        |    global another
        |    return {
        |       "SOME_VAR": somevar,
        |       "ANOTHER_VAR": another
        |    }
      """.stripMargin)

  override val testLargeInput =
    TestConfig("""
        |def main(args):
        |    return args
      """.stripMargin)

  it should "support zip-encoded action using non-default entry points" in {
    val srcs = Seq(
      Seq("__main__.py") ->
        """
          |from echo import echo
          |def niam(args):
          |    return echo(args)
        """.stripMargin,
      Seq("echo.py") ->
        """
          |def echo(args):
          |  return { "echo": args }
        """.stripMargin)

    val code = ZipBuilder.mkBase64Zip(srcs)

    val (out, err) = withActionContainer() { c =>
      val (initCode, initRes) = c.init(initPayload(code, main = "niam"))
      initCode should be(200)

      val args = JsObject("msg" -> JsString("it works"))
      val (runCode, runRes) = c.run(runPayload(args))

      runCode should be(200)
      runRes.get.fields.get("echo") shouldBe Some(args)
    }

    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e shouldBe empty
    })
  }

  it should "support zip-encoded action which can read from relative paths" in {
    val srcs = Seq(
      Seq("__main__.py") ->
        """
          |def main(args):
          |    with open('workfile', 'r') as f:
          |      return { 'file': f.read() }
        """.stripMargin,
      Seq("workfile") -> "this is a test string")

    val code = ZipBuilder.mkBase64Zip(srcs)

    val (out, err) = withActionContainer() { c =>
      val (initCode, initRes) = c.init(initPayload(code))
      initCode should be(200)

      val args = JsObject()
      val (runCode, runRes) = c.run(runPayload(args))

      runCode should be(200)
      runRes.get.fields.get("file") shouldBe Some("this is a test string".toJson)
    }

    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e shouldBe empty
    })
  }

  it should "report error if zip-encoded action does not include required file" in {
    val srcs = Seq(
      Seq("echo.py") ->
        """
        |def echo(args):
        |  return { "echo": args }
      """.stripMargin)

    val code = ZipBuilder.mkBase64Zip(srcs)

    val (out, err) = withActionContainer() { c =>
      val (initCode, initRes) = c.init(initPayload(code, main = "echo"))
      initCode should be(502)
    }

    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e should include("Zip file does not include")
    })
  }

  it should "return on action error when action fails" in {
    val (out, err) = withActionContainer() { c =>
      val code =
        """
          |def div(x, y):
          |    return x/y
          |
          |def main(dict):
          |    return {"divBy0": div(5,0)}
        """.stripMargin

      val (initCode, _) = c.init(initPayload(code))
      initCode should be(200)

      val (runCode, runRes) = c.run(runPayload(JsObject()))
      /* ActionLoop does not set 502 if there are application errors
       * Since it only receive a string from the application
       * it should parse the entire string  in JSON just to find it is an "error"
       */
      if (errorCodeOnRun)
        runCode should be(502)

      runRes shouldBe defined
      runRes.get.fields.get("error") shouldBe defined
    }

    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e should include("Traceback")
    })
  }

  it should "log compilation errors" in {
    val (out, err) = withActionContainer() { c =>
      val code =
        """
          | 10 PRINT "Hello!"
          | 20 GOTO 10
        """.stripMargin

      val (initCode, res) = c.init(initPayload(code))
      // init checks whether compilation was successful, so return 502
      initCode should be(502)
    }
    if (errorCodeOnRun)
      checkStreams(out, err, {
        case (o, e) =>
          o shouldBe empty
          e should include("Traceback")
      })
  }

  it should "support application errors" in {
    val (out, err) = withActionContainer() { c =>
      val code =
        """
          |def main(args):
          |    return { "error": "sorry" }
        """.stripMargin

      val (initCode, _) = c.init(initPayload(code))
      initCode should be(200)

      val (runCode, runRes) = c.run(runPayload(JsObject()))
      runCode should be(200) // action writer returning an error is OK

      runRes shouldBe defined
      runRes should be(Some(JsObject("error" -> JsString("sorry"))))
    }

    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e shouldBe empty
    })
  }

  it should "error when importing a not-supported package" in {
    val (out, err) = withActionContainer() { c =>
      val code =
        """
          |import iamnotsupported
          |def main(args):
          |    return { "error": "not reaching here" }
        """.stripMargin

      // action loop detects those errors at init time
      val (initCode, _) = c.init(initPayload(code))
      initCode should be(502)
    }
    checkStreams(out, err, {
      case (o, e) =>
        o shouldBe empty
        e should include regex ("Traceback|cannot start")
    })
  }

  it should "have a valid sys.executable" in {
    withActionContainer() { c =>
      val code =
        """
          |import sys
          |def main(args):
          |    return { "sys": sys.executable }
        """.stripMargin

      val (initCode, res) = c.init(initPayload(code))
      initCode should be(200)

      val (runCode, runRes) = c.run(runPayload(JsObject()))
      runCode should be(200)
      runRes.get.fields.get("sys").get.toString() should include("python")
    }
  }
}