// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "extensions/renderer/module_system.h"

#include <stdint.h>

#include <memory>
#include <utility>

#include "base/bind.h"
#include "extensions/renderer/module_system_test.h"

namespace extensions {

class CounterNatives : public ObjectBackedNativeHandler {
 public:
  explicit CounterNatives(ScriptContext* context)
      : ObjectBackedNativeHandler(context), counter_(0) {}

  // ObjectBackedNativeHandler:
  void AddRoutes() override {
    RouteHandlerFunction("Get", base::BindRepeating(&CounterNatives::Get,
                                                    base::Unretained(this)));
    RouteHandlerFunction("Increment",
                         base::BindRepeating(&CounterNatives::Increment,
                                             base::Unretained(this)));
  }

  void Get(const v8::FunctionCallbackInfo<v8::Value>& args) {
    args.GetReturnValue().Set(static_cast<int32_t>(counter_));
  }

  void Increment(const v8::FunctionCallbackInfo<v8::Value>& args) {
    counter_++;
  }

 private:
  int counter_;
};

class TestExceptionHandler : public ModuleSystem::ExceptionHandler {
 public:
  TestExceptionHandler()
      : ModuleSystem::ExceptionHandler(nullptr), handled_exception_(false) {}

  void HandleUncaughtException(const v8::TryCatch& try_catch) override {
    handled_exception_ = true;
  }

  bool handled_exception() const { return handled_exception_; }

 private:
  bool handled_exception_;
};

TEST_F(ModuleSystemTest, TestExceptionHandling) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  TestExceptionHandler* handler = new TestExceptionHandler;
  std::unique_ptr<ModuleSystem::ExceptionHandler> scoped_handler(handler);
  ASSERT_FALSE(handler->handled_exception());
  env()->module_system()->SetExceptionHandlerForTest(std::move(scoped_handler));

  env()->RegisterModule("test", "throw 'hi';");
  env()->module_system()->Require("test");
  ASSERT_TRUE(handler->handled_exception());

  ExpectNoAssertionsMade();
}

TEST_F(ModuleSystemTest, TestRequire) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("add",
                        "exports.$set('Add',"
                                     "function(x, y) { return x + y; });");
  env()->RegisterModule("test",
                        "var Add = require('add').Add;"
                        "requireNative('assert').AssertTrue(Add(3, 5) == 8);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestNestedRequire) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("add",
                        "exports.$set('Add',"
                                     "function(x, y) { return x + y; });");
  env()->RegisterModule("double",
                        "var Add = require('add').Add;"
                        "exports.$set('Double',"
                                     "function(x) { return Add(x, x); });");
  env()->RegisterModule("test",
                        "var Double = require('double').Double;"
                        "requireNative('assert').AssertTrue(Double(3) == 6);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestModuleInsulation) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("x",
                        "var x = 10;"
                        "exports.$set('X', function() { return x; });");
  env()->RegisterModule("y",
                        "var x = 15;"
                        "require('x');"
                        "exports.$set('Y', function() { return x; });");
  env()->RegisterModule("test",
                        "var Y = require('y').Y;"
                        "var X = require('x').X;"
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(!this.hasOwnProperty('x'));"
                        "assert.AssertTrue(Y() == 15);"
                        "assert.AssertTrue(X() == 10);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestNativesAreDisabledOutsideANativesEnabledScope) {
  env()->RegisterModule("test",
                        "var assert;"
                        "try {"
                        "  assert = requireNative('assert');"
                        "} catch (e) {"
                        "  var caught = true;"
                        "}"
                        "if (assert) {"
                        "  assert.AssertTrue(true);"
                        "}");
  env()->module_system()->Require("test");
  ExpectNoAssertionsMade();
}

TEST_F(ModuleSystemTest, TestNativesAreEnabledWithinANativesEnabledScope) {
  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(true);");

  {
    ModuleSystem::NativesEnabledScope natives_enabled(env()->module_system());
    {
      ModuleSystem::NativesEnabledScope natives_enabled_inner(
          env()->module_system());
    }
    env()->module_system()->Require("test");
  }
}

TEST_F(ModuleSystemTest, TestLazyField) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("lazy", "exports.$set('x', 5);");

  v8::Local<v8::Object> object = env()->CreateGlobal("object");

  env()->module_system()->SetLazyField(object, "blah", "lazy", "x");

  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(object.blah == 5);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestLazyFieldYieldingObject) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule(
      "lazy",
      "var object = {};"
      "object.__defineGetter__('z', function() { return 1; });"
      "object.x = 5;"
      "object.y = function() { return 10; };"
      "exports.$set('object', object);");

  v8::Local<v8::Object> object = env()->CreateGlobal("object");

  env()->module_system()->SetLazyField(object, "thing", "lazy", "object");

  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(object.thing.x == 5);"
                        "assert.AssertTrue(object.thing.y() == 10);"
                        "assert.AssertTrue(object.thing.z == 1);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestLazyFieldIsOnlyEvaledOnce) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->module_system()->RegisterNativeHandler(
      "counter",
      std::unique_ptr<NativeHandler>(new CounterNatives(env()->context())));
  env()->RegisterModule("lazy",
                        "requireNative('counter').Increment();"
                        "exports.$set('x', 5);");

  v8::Local<v8::Object> object = env()->CreateGlobal("object");

  env()->module_system()->SetLazyField(object, "x", "lazy", "x");

  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "var counter = requireNative('counter');"
                        "assert.AssertTrue(counter.Get() == 0);"
                        "object.x;"
                        "assert.AssertTrue(counter.Get() == 1);"
                        "object.x;"
                        "assert.AssertTrue(counter.Get() == 1);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestRequireNativesAfterLazyEvaluation) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("lazy", "exports.$set('x', 5);");
  v8::Local<v8::Object> object = env()->CreateGlobal("object");

  env()->module_system()->SetLazyField(object, "x", "lazy", "x");
  env()->RegisterModule("test",
                        "object.x;"
                        "requireNative('assert').AssertTrue(true);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestTransitiveRequire) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("dependency", "exports.$set('x', 5);");
  env()->RegisterModule("lazy",
                        "exports.$set('output', require('dependency'));");

  v8::Local<v8::Object> object = env()->CreateGlobal("object");

  env()->module_system()->SetLazyField(object, "thing", "lazy", "output");

  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(object.thing.x == 5);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestModulesOnlyGetEvaledOnce) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->module_system()->RegisterNativeHandler(
      "counter",
      std::unique_ptr<NativeHandler>(new CounterNatives(env()->context())));

  env()->RegisterModule("incrementsWhenEvaled",
                        "requireNative('counter').Increment();");
  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "var counter = requireNative('counter');"
                        "assert.AssertTrue(counter.Get() == 0);"
                        "require('incrementsWhenEvaled');"
                        "assert.AssertTrue(counter.Get() == 1);"
                        "require('incrementsWhenEvaled');"
                        "assert.AssertTrue(counter.Get() == 1);");

  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestOverrideNativeHandler) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->OverrideNativeHandler("assert",
                               "exports.$set('AssertTrue', function() {});");
  env()->RegisterModule("test", "requireNative('assert').AssertTrue(true);");
  ExpectNoAssertionsMade();
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestOverrideNonExistentNativeHandler) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->OverrideNativeHandler("thing", "exports.$set('x', 5);");
  env()->RegisterModule("test",
                        "var assert = requireNative('assert');"
                        "assert.AssertTrue(requireNative('thing').x == 5);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestPrivatesIsPrivate) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule(
      "test",
      "var v = privates({});"
      "requireNative('assert').AssertFalse(v instanceof Object);");
  env()->module_system()->Require("test");
}

TEST_F(ModuleSystemTest, TestLoadScript) {
  ModuleSystem::NativesEnabledScope natives_enabled_scope(
      env()->module_system());
  env()->RegisterModule("add",
                        "var addFunction = function(x, y) { return x + y; };");
  env()->RegisterModule(
      "test",
      "loadScript('add');"
      "requireNative('assert').AssertTrue(addFunction(3, 5) == 8);");
  env()->module_system()->Require("test");
  RunResolvedPromises();
}

}  // namespace extensions