// library headers
#include <gtest/gtest.h>
#include <boost/filesystem.hpp>

// local headers
#include "../../src/core/desktopfilereader.h"

namespace bf = boost::filesystem;

class DesktopFileReaderFixture : public ::testing::Test {
    void SetUp() override {}
    void TearDown() override {}
};

TEST_F(DesktopFileReaderFixture, testDefaultConstructor) {
    DesktopFileReader reader;
    EXPECT_TRUE(reader.isEmpty());
}

TEST_F(DesktopFileReaderFixture, testPathConstructor) {
    bf::path path = "/dev/null";

    DesktopFileReader reader(path);
    EXPECT_FALSE(reader.isEmpty());

    ASSERT_THROW(DesktopFileReader("/no/such/file/or/directory"), std::invalid_argument);
}

TEST_F(DesktopFileReaderFixture, testStreamConstructor) {
    std::stringstream ss;
    DesktopFileReader reader(ss);

    EXPECT_TRUE(reader.isEmpty());
}

TEST_F(DesktopFileReaderFixture, testPathConstructorWithEmptyPath) {
    ASSERT_THROW(DesktopFileReader(""), std::invalid_argument);
}

TEST_F(DesktopFileReaderFixture, testPathConstructorWithNonExistingPath) {
    ASSERT_THROW(DesktopFileReader("/no/such/path/42"), std::invalid_argument);
}

TEST_F(DesktopFileReaderFixture, testEqualityAndInequalityOperators) {
    DesktopFileReader emptyReader;
    EXPECT_TRUE(emptyReader == emptyReader);
    EXPECT_FALSE(emptyReader != emptyReader);
}

TEST_F(DesktopFileReaderFixture, testCopyConstructor) {
    bf::path path = "/dev/null";

    DesktopFileReader reader(path);
    EXPECT_FALSE(reader.isEmpty());

    DesktopFileReader copy = reader;
    EXPECT_FALSE(copy.isEmpty());

    EXPECT_EQ(reader, copy);
}

TEST_F(DesktopFileReaderFixture, testCopyAssignmentConstructor) {
    bf::path path = "/dev/null";

    DesktopFileReader reader;
    EXPECT_TRUE(reader.isEmpty());

    DesktopFileReader otherReader(path);
    EXPECT_FALSE(otherReader.isEmpty());

    reader = otherReader;
    EXPECT_EQ(reader.path(), path);

    // test self-assignment
    reader = reader;
}

TEST_F(DesktopFileReaderFixture, testMoveAssignmentConstructor) {
    bf::path path = "/dev/null";

    DesktopFileReader reader;
    EXPECT_TRUE(reader.isEmpty());

    DesktopFileReader otherReader(path);
    EXPECT_FALSE(otherReader.isEmpty());

    reader = std::move(otherReader);
    EXPECT_EQ(reader.path(), path);

    // test self-assignment
    reader = std::move(reader);
}