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// regarding copyright ownership.  The SFC 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 org.openqa.selenium.atoms;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.InstanceOfAssertFactories.MAP;

import java.io.IOException;
import java.util.Map;
import net.sourceforge.htmlunit.corejs.javascript.Context;
import net.sourceforge.htmlunit.corejs.javascript.ContextFactory;
import net.sourceforge.htmlunit.corejs.javascript.ScriptableObject;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.openqa.selenium.json.Json;

class CompiledAtomsNotLeakingTest {

  private static final String RESOURCE_PATH = "/org/openqa/selenium/atoms/execute_script.js";

  private static String fragment;

  private ScriptableObject global;

  @BeforeAll
  public static void loadFragment() throws IOException {
    fragment = JavaScriptLoader.loadResource(RESOURCE_PATH);
  }

  @BeforeEach
  public void prepareGlobalObject() {
    ContextFactory.getGlobal()
        .call(
            context -> {
              global = context.initStandardObjects();
              global.defineProperty("_", 1234, ScriptableObject.EMPTY);
              assertThat(eval(context, "_")).isEqualTo(1234);

              // We're using the //javascript/webdriver/atoms:execute_script atom,
              // which assumes it is used in the context of a browser window, so make
              // sure the "window" free variable is defined and refers to the global
              // context.
              assertThat(eval(context, "this.window=this;")).isEqualTo(global);
              assertThat(eval(context, "this")).isEqualTo(global);
              assertThat(eval(context, "window")).isEqualTo(global);
              assertThat(eval(context, "this === window")).isEqualTo(true);

              return null;
            });
  }

  /** <a href="https://github.com/SeleniumHQ/selenium-google-code-issue-archive/issues/1333"></a> */
  @Test
  void fragmentWillNotLeakVariablesToEnclosingScopes() {
    ContextFactory.getGlobal()
        .call(
            context -> {
              eval(context, "(" + fragment + ")()", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);

              eval(context, "(" + fragment + ").call(this)", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);

              eval(context, "(" + fragment + ").apply(this,[])", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);

              eval(context, "(" + fragment + ").call(null)", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);

              eval(context, "(" + fragment + ").apply(null,[])", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);

              eval(context, "(" + fragment + ").call({})", RESOURCE_PATH);
              assertThat(eval(context, "_")).isEqualTo(1234);
              return null;
            });
  }

  @Test
  void nestedFragmentsShouldNotLeakVariables() {
    ContextFactory.getGlobal()
        .call(
            context -> {
              // executeScript atom recursing on itself to execute "return 1+2".
              // Should result in {status:0,value:{status:0,value:3}}
              // Global scope should not be modified.
              String nestedScript =
                  String.format("(%s).call(null, %s, ['return 1+2;'], true)", fragment, fragment);

              String jsonResult = (String) eval(context, nestedScript, RESOURCE_PATH);

              Map<String, Object> result = new Json().toType(jsonResult, Json.MAP_TYPE);

              assertThat(result.get("status"))
                  .isInstanceOf(Long.class)
                  .as(jsonResult)
                  .isEqualTo(0L);
              assertThat(result.get("value")).isInstanceOf(Map.class);
              assertThat(result.get("value"))
                  .asInstanceOf(MAP)
                  .hasSize(2)
                  .containsEntry("status", 0L)
                  .containsEntry("value", 3L);

              assertThat(eval(context, "_")).isEqualTo(1234);
              return null;
            });
  }

  private Object eval(Context context, String script) {
    return eval(context, script, "");
  }

  private Object eval(Context context, String script, String src) {
    return context.evaluateString(global, script, src, 1, null);
  }
}
