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/*
 * Copyright 2011-2024 GatlingCorp (https://gatling.io)
 *
 * Licensed 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 io.gatling.http.request.builder

import scala.concurrent.duration.FiniteDuration

import io.gatling.commons.validation.Validation
import io.gatling.core.action.Action
import io.gatling.core.check.{ ChecksumAlgorithm, ChecksumCheck }
import io.gatling.core.config.GatlingConfiguration
import io.gatling.core.session._
import io.gatling.core.structure.ScenarioContext
import io.gatling.http.ResponseTransformer
import io.gatling.http.action.{ HttpActionBuilder, HttpRequestAction }
import io.gatling.http.cache.HttpCaches
import io.gatling.http.check.HttpCheck
import io.gatling.http.check.HttpCheckScope._
import io.gatling.http.client.uri.Uri
import io.gatling.http.engine.response.HttpTracing
import io.gatling.http.protocol.HttpProtocol
import io.gatling.http.request._
import io.gatling.http.response.Response
import io.gatling.internal.quicklens._

import io.netty.handler.codec.http.HttpMethod

object HttpAttributes {
  val Empty: HttpAttributes =
    new HttpAttributes(
      checks = Nil,
      ignoreProtocolChecks = false,
      silent = None,
      followRedirect = true,
      responseTransformer = None,
      explicitResources = Nil,
      requestTimeout = None
    )
}

final case class HttpAttributes(
    checks: List[HttpCheck],
    ignoreProtocolChecks: Boolean,
    silent: Option[Boolean],
    followRedirect: Boolean,
    responseTransformer: Option[ResponseTransformer],
    explicitResources: List[HttpRequestBuilder],
    requestTimeout: Option[FiniteDuration]
)

object HttpRequestBuilder {
  def apply(requestName: Expression[String], method: HttpMethod, urlOrURI: Either[Expression[String], Uri]): HttpRequestBuilder =
    HttpRequestBuilder(CommonAttributes(requestName = requestName, method = method, urlOrURI = urlOrURI), BodyAttributes.Empty, HttpAttributes.Empty)
}

/**
 * This class serves as model for all HttpRequestBuilders
 *
 * @param httpAttributes
 *   the base HTTP attributes
 */
final case class HttpRequestBuilder(commonAttributes: CommonAttributes, bodyAttributes: BodyAttributes, httpAttributes: HttpAttributes)
    extends RequestWithBodyBuilder[HttpRequestBuilder]
    with HttpActionBuilder {
  override protected def newInstance(commonAttributes: CommonAttributes): HttpRequestBuilder =
    HttpRequestBuilder(commonAttributes, bodyAttributes, httpAttributes)
  override protected def newInstance(bodyAttributes: BodyAttributes): HttpRequestBuilder = HttpRequestBuilder(commonAttributes, bodyAttributes, httpAttributes)

  def check(checks: HttpCheck*): HttpRequestBuilder = {
    require(!checks.contains(null), "Checks can't contain null elements. Forward reference issue?")
    this.modify(_.httpAttributes.checks)(_ ::: checks.toList)
  }

  def checkIf(condition: Expression[Boolean])(thenChecks: HttpCheck*): HttpRequestBuilder =
    check(thenChecks.map(_.checkIf(condition)): _*)

  def checkIf(condition: (Response, Session) => Validation[Boolean])(thenChecks: HttpCheck*): HttpRequestBuilder =
    check(thenChecks.map(_.checkIf(condition)): _*)

  def ignoreProtocolChecks: HttpRequestBuilder = this.modify(_.httpAttributes.ignoreProtocolChecks).setTo(true)

  def silent: HttpRequestBuilder = this.modify(_.httpAttributes.silent).setTo(Some(true))

  def notSilent: HttpRequestBuilder = this.modify(_.httpAttributes.silent).setTo(Some(false))

  def disableFollowRedirect: HttpRequestBuilder = this.modify(_.httpAttributes.followRedirect).setTo(false)

  /**
   * @param responseTransformer
   *   transforms the response before it's handled to the checks pipeline
   */
  def transformResponse(responseTransformer: ResponseTransformer): HttpRequestBuilder =
    this.modify(_.httpAttributes.responseTransformer).setTo(Some(responseTransformer))

  def resources(res: HttpRequestBuilder*): HttpRequestBuilder = {
    require(!res.contains(null), "resources can't contain null elements. Forward reference issue?")
    this.modify(_.httpAttributes.explicitResources)(_ ::: res.toList)
  }

  def requestTimeout(timeout: FiniteDuration): HttpRequestBuilder =
    this.modify(_.httpAttributes.requestTimeout).setTo(Some(timeout))

  override def build(ctx: ScenarioContext, next: Action): Action = {
    val httpComponents = lookUpHttpComponents(ctx.protocolComponentsRegistry)
    val httpRequest = build(httpComponents.httpCaches, httpComponents.httpProtocol, ctx.throttled, ctx.coreComponents.configuration)
    new HttpRequestAction(
      httpRequest,
      httpComponents.httpTxExecutor,
      ctx.coreComponents,
      next
    )
  }

  @SuppressWarnings(Array("org.wartremover.warts.Recursion"))
  private[http] def build(httpCaches: HttpCaches, httpProtocol: HttpProtocol, throttled: Boolean, configuration: GatlingConfiguration): HttpRequestDef = {
    val requestChecks = httpAttributes.checks

    val requestAndProtocolChecks =
      if (httpAttributes.ignoreProtocolChecks) {
        requestChecks
      } else {
        val protocolChecks = httpProtocol.responsePart.checks
        requestChecks ::: protocolChecks
      }

    val checks =
      if (requestAndProtocolChecks.exists(_.scope == Status)) requestAndProtocolChecks
      else requestAndProtocolChecks ::: List(RequestBuilder.DefaultHttpCheck)

    val sortedChecks = checks.zipWithIndex
      .sortBy { case (check, rank) =>
        (check.scope, rank)
      }
      .map { case (check, _) =>
        check
      }

    val resolvedFollowRedirect = httpProtocol.responsePart.followRedirect && httpAttributes.followRedirect

    val resolvedResponseTransformer = httpAttributes.responseTransformer.orElse(httpProtocol.responsePart.responseTransformer)

    val resolvedResources = httpAttributes.explicitResources.map(_.build(httpCaches, httpProtocol, throttled, configuration))

    val resolvedRequestExpression =
      new HttpRequestExpressionBuilder(commonAttributes, bodyAttributes, httpAttributes, httpCaches, httpProtocol, configuration).build

    val checksumAlgorithms: List[ChecksumAlgorithm] =
      sortedChecks
        .map(_.wrapped)
        .collect { case check: ChecksumCheck[_] => check.algorithm }

    val storeBodyParts = HttpTracing.IS_HTTP_DEBUG_ENABLED ||
      // we can't assume anything about if and how the response body will be used,
      // let's force bytes so we don't risk decoding binary content
      resolvedResponseTransformer.isDefined ||
      sortedChecks.exists(_.scope == Body)

    HttpRequestDef(
      commonAttributes.requestName,
      resolvedRequestExpression,
      HttpRequestConfig(
        checks = sortedChecks,
        responseTransformer = resolvedResponseTransformer,
        throttled = throttled,
        silent = httpAttributes.silent,
        followRedirect = resolvedFollowRedirect,
        checksumAlgorithms = checksumAlgorithms,
        storeBodyParts = storeBodyParts,
        defaultCharset = configuration.core.charset,
        explicitResources = resolvedResources,
        httpProtocol = httpProtocol
      )
    )
  }
}




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