/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "bindings/core/v8/ScriptPromise.h"

#include "bindings/core/v8/ScriptFunction.h"
#include "bindings/core/v8/ScriptValue.h"
#include "bindings/core/v8/V8Binding.h"
#include "core/dom/DOMException.h"
#include "core/dom/ExceptionCode.h"

#include <gtest/gtest.h>
#include <v8.h>

namespace blink {

namespace {

void callback(const v8::FunctionCallbackInfo<v8::Value>& info) { }

class Function : public ScriptFunction {
public:
    static v8::Handle<v8::Function> createFunction(ScriptState* scriptState, String* value)
    {
        Function* self = new Function(scriptState, value);
        return self->bindToV8Function();
    }

private:
    Function(ScriptState* scriptState, String* value)
        : ScriptFunction(scriptState)
        , m_value(value)
    {
    }

    virtual ScriptValue call(ScriptValue value) override
    {
        ASSERT(!value.isEmpty());
        *m_value = toCoreString(value.v8Value()->ToString());
        return value;
    }

    String* m_value;
};

class ScriptPromiseTest : public testing::Test {
public:
    ScriptPromiseTest()
        : m_scope(v8::Isolate::GetCurrent())
    {
    }

    ~ScriptPromiseTest()
    {
        // FIXME: We put this statement here to clear an exception from the isolate.
        createClosure(callback, v8::Undefined(m_scope.isolate()), m_scope.isolate());

        // Execute all pending microtasks
        isolate()->RunMicrotasks();
    }

    ScriptState* scriptState() const { return m_scope.scriptState(); }
    v8::Isolate* isolate() const { return m_scope.isolate(); }

protected:
    typedef ScriptPromise::InternalResolver Resolver;
    V8TestingScope m_scope;
};

TEST_F(ScriptPromiseTest, constructFromNonPromise)
{
    v8::TryCatch trycatch;
    ScriptPromise promise(scriptState(), v8::Undefined(isolate()));
    ASSERT_TRUE(trycatch.HasCaught());
    ASSERT_TRUE(promise.isEmpty());
}

TEST_F(ScriptPromiseTest, thenResolve)
{
    Resolver resolver(scriptState());
    ScriptPromise promise = resolver.promise();
    String onFulfilled, onRejected;
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();
    resolver.resolve(v8String(isolate(), "hello"));

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ("hello", onFulfilled);
    EXPECT_EQ(String(), onRejected);
}

TEST_F(ScriptPromiseTest, resolveThen)
{
    Resolver resolver(scriptState());
    ScriptPromise promise = resolver.promise();
    String onFulfilled, onRejected;
    resolver.resolve(v8String(isolate(), "hello"));
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ("hello", onFulfilled);
    EXPECT_EQ(String(), onRejected);
}

TEST_F(ScriptPromiseTest, thenReject)
{
    Resolver resolver(scriptState());
    ScriptPromise promise = resolver.promise();
    String onFulfilled, onRejected;
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();
    resolver.reject(v8String(isolate(), "hello"));

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ("hello", onRejected);
}

TEST_F(ScriptPromiseTest, rejectThen)
{
    Resolver resolver(scriptState());
    ScriptPromise promise = resolver.promise();
    String onFulfilled, onRejected;
    resolver.reject(v8String(isolate(), "hello"));
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ("hello", onRejected);
}

TEST_F(ScriptPromiseTest, castPromise)
{
    ScriptPromise promise = Resolver(scriptState()).promise();
    ScriptPromise newPromise = ScriptPromise::cast(scriptState(), promise.v8Value());

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(promise.v8Value(), newPromise.v8Value());
}

TEST_F(ScriptPromiseTest, castNonPromise)
{
    String onFulfilled1, onFulfilled2, onRejected1, onRejected2;

    ScriptValue value = ScriptValue(scriptState(), v8String(isolate(), "hello"));
    ScriptPromise promise1 = ScriptPromise::cast(scriptState(), ScriptValue(value));
    ScriptPromise promise2 = ScriptPromise::cast(scriptState(), ScriptValue(value));
    promise1.then(Function::createFunction(scriptState(), &onFulfilled1), Function::createFunction(scriptState(), &onRejected1));
    promise2.then(Function::createFunction(scriptState(), &onFulfilled2), Function::createFunction(scriptState(), &onRejected2));

    ASSERT_FALSE(promise1.isEmpty());
    ASSERT_FALSE(promise2.isEmpty());
    EXPECT_NE(promise1.v8Value(), promise2.v8Value());

    ASSERT_TRUE(promise1.v8Value()->IsPromise());
    ASSERT_TRUE(promise2.v8Value()->IsPromise());

    EXPECT_EQ(String(), onFulfilled1);
    EXPECT_EQ(String(), onFulfilled2);
    EXPECT_EQ(String(), onRejected1);
    EXPECT_EQ(String(), onRejected2);

    isolate()->RunMicrotasks();

    EXPECT_EQ("hello", onFulfilled1);
    EXPECT_EQ("hello", onFulfilled2);
    EXPECT_EQ(String(), onRejected1);
    EXPECT_EQ(String(), onRejected2);
}

TEST_F(ScriptPromiseTest, reject)
{
    String onFulfilled, onRejected;

    ScriptValue value = ScriptValue(scriptState(), v8String(isolate(), "hello"));
    ScriptPromise promise = ScriptPromise::reject(scriptState(), ScriptValue(value));
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    ASSERT_TRUE(promise.v8Value()->IsPromise());

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ("hello", onRejected);
}

TEST_F(ScriptPromiseTest, rejectWithExceptionState)
{
    String onFulfilled, onRejected;
    ScriptPromise promise = ScriptPromise::rejectWithDOMException(scriptState(), DOMException::create(SyntaxError, "some syntax error"));
    promise.then(Function::createFunction(scriptState(), &onFulfilled), Function::createFunction(scriptState(), &onRejected));

    ASSERT_FALSE(promise.isEmpty());
    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ(String(), onRejected);

    isolate()->RunMicrotasks();

    EXPECT_EQ(String(), onFulfilled);
    EXPECT_EQ("SyntaxError: some syntax error", onRejected);
}

} // namespace

} // namespace blink