/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.
 */

#include "test/Common.h"
#include "util/Maybe.h"

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

namespace aapt {

struct Dummy {
    Dummy() {
        data = new int;
        *data = 1;
        std::cerr << "Construct Dummy{0x" << (void *) this
                  << "} with data=0x" << (void*) data
                  << std::endl;
    }

    Dummy(const Dummy& rhs) {
        data = nullptr;
        if (rhs.data) {
            data = new int;
            *data = *rhs.data;
        }
        std::cerr << "CopyConstruct Dummy{0x" << (void *) this
                  << "} from Dummy{0x" << (const void*) &rhs
                  << "}" << std::endl;
    }

    Dummy(Dummy&& rhs) {
        data = rhs.data;
        rhs.data = nullptr;
        std::cerr << "MoveConstruct Dummy{0x" << (void *) this
                  << "} from Dummy{0x" << (const void*) &rhs
                  << "}" << std::endl;
    }

    Dummy& operator=(const Dummy& rhs) {
        delete data;
        data = nullptr;

        if (rhs.data) {
            data = new int;
            *data = *rhs.data;
        }
        std::cerr << "CopyAssign Dummy{0x" << (void *) this
                  << "} from Dummy{0x" << (const void*) &rhs
                  << "}" << std::endl;
        return *this;
    }

    Dummy& operator=(Dummy&& rhs) {
        delete data;
        data = rhs.data;
        rhs.data = nullptr;
        std::cerr << "MoveAssign Dummy{0x" << (void *) this
                  << "} from Dummy{0x" << (const void*) &rhs
                  << "}" << std::endl;
        return *this;
    }

    ~Dummy() {
        std::cerr << "Destruct Dummy{0x" << (void *) this
                  << "} with data=0x" << (void*) data
                  << std::endl;
        delete data;
    }

    int* data;
};

TEST(MaybeTest, MakeNothing) {
    Maybe<int> val = make_nothing<int>();
    AAPT_EXPECT_FALSE(val);

    Maybe<std::string> val2 = make_nothing<std::string>();
    AAPT_EXPECT_FALSE(val2);

    val2 = make_nothing<std::string>();
    AAPT_EXPECT_FALSE(val2);
}

TEST(MaybeTest, MakeSomething) {
    Maybe<int> val = make_value(23);
    AAPT_ASSERT_TRUE(val);
    EXPECT_EQ(23, val.value());

    Maybe<std::string> val2 = make_value(std::string("hey"));
    AAPT_ASSERT_TRUE(val2);
    EXPECT_EQ(std::string("hey"), val2.value());
}

TEST(MaybeTest, Lifecycle) {
    Maybe<Dummy> val = make_nothing<Dummy>();

    Maybe<Dummy> val2 = make_value(Dummy());
}

TEST(MaybeTest, MoveAssign) {
    Maybe<Dummy> val;
    {
        Maybe<Dummy> val2 = Dummy();
        val = std::move(val2);
    }
}

TEST(MaybeTest, Equality) {
    Maybe<int> a = 1;
    Maybe<int> b = 1;
    Maybe<int> c;

    Maybe<int> emptyA, emptyB;

    EXPECT_EQ(a, b);
    EXPECT_EQ(b, a);
    EXPECT_NE(a, c);
    EXPECT_EQ(emptyA, emptyB);
}

} // namespace aapt
