// Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

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

#include <util/unittests/resource.h>
#include <util/unittests/check_valgrind.h>

#include <log/log_formatter.h>
#include <log/logger_level.h>

#include <vector>
#include <string>

using namespace std;

namespace {

class FormatterTest : public ::testing::Test {
protected:
    typedef pair<isc::log::Severity, string> Output;
    typedef isc::log::Formatter<FormatterTest> Formatter;
    vector<Output> outputs;
public:
    void output(const isc::log::Severity& prefix, const string& message) {
        outputs.push_back(Output(prefix, message));
    }
    // Just shortcut for new string
    string* s(const char* text) {
        return (new string(text));
    }
};

// Create an inactive formatter and check it doesn't produce any output
TEST_F(FormatterTest, inactive) {
    Formatter();
    EXPECT_EQ(0, outputs.size());
}

// Create an active formatter and check it produces output. Does no arg
// substitution yet
TEST_F(FormatterTest, active) {
    Formatter(isc::log::INFO, s("Text of message"), this);
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("Text of message", outputs[0].second);
}

// No output even when we have an arg on the inactive formatter
TEST_F(FormatterTest, inactiveArg) {
    Formatter().arg("Hello");
    EXPECT_EQ(0, outputs.size());
}

// Create an active formatter and replace a placeholder with string
TEST_F(FormatterTest, stringArg) {
    {
        SCOPED_TRACE("C++ string");
        Formatter(isc::log::INFO, s("Hello %1"), this).arg(string("World"));
        ASSERT_EQ(1, outputs.size());
        EXPECT_EQ(isc::log::INFO, outputs[0].first);
        EXPECT_EQ("Hello World", outputs[0].second);
    }
    {
        SCOPED_TRACE("C++ string");
        Formatter(isc::log::INFO, s("Hello %1"), this).arg(string("Internet"));
        ASSERT_EQ(2, outputs.size());
        EXPECT_EQ(isc::log::INFO, outputs[1].first);
        EXPECT_EQ("Hello Internet", outputs[1].second);
    }
}

// Test the .deactivate() method
TEST_F(FormatterTest, deactivate) {
    Formatter(isc::log::INFO, s("Text of message"), this).deactivate();
    // If there was no .deactivate, it should have output it.
    // But not now.
    ASSERT_EQ(0, outputs.size());
}

// Can convert to string
TEST_F(FormatterTest, intArg) {
    Formatter(isc::log::INFO, s("The answer is %1"), this).arg(42);
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("The answer is 42", outputs[0].second);
}

// Can use multiple arguments at different places
TEST_F(FormatterTest, multiArg) {
    Formatter(isc::log::INFO, s("The %2 are %1"), this).arg("switched").
        arg("arguments");
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("The arguments are switched", outputs[0].second);
}

#ifdef ENABLE_LOGGER_CHECKS

TEST_F(FormatterTest, mismatchedPlaceholders) {
    // Throws MismatchedPlaceholders exception if the placeholder is missing
    // for a supplied argument.
    EXPECT_THROW(Formatter(isc::log::INFO, s("Missing the second %1"), this).
                 arg("argument").arg("missing"),
                 isc::log::MismatchedPlaceholders);

#ifdef EXPECT_DEATH
    // Likewise, if there's a redundant placeholder (or missing argument), the
    // check detects it and aborts the program.  Due to the restriction of the
    // current implementation, it doesn't throw.
    if (!isc::util::unittests::runningOnValgrind()) {
        EXPECT_DEATH({
            isc::util::unittests::dontCreateCoreDumps();
            Formatter(isc::log::INFO, s("Too many arguments in %1 %2"), this).
                arg("only one");
        }, ".*");
    }
#endif /* EXPECT_DEATH */
    // Mixed case of above two: the exception will be thrown due to the missing
    // placeholder. The other check is disabled due to that.
    EXPECT_THROW(Formatter(isc::log::INFO, s("Missing the first %2"), this).
                 arg("missing").arg("argument"),
                 isc::log::MismatchedPlaceholders);
}

#else

// If logger checks are not enabled, nothing is thrown
TEST_F(FormatterTest, mismatchedPlaceholders) {
    Formatter(isc::log::INFO, s("Missing the second %1"), this).
        arg("argument").arg("missing");
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("Missing the second argument "
              "@@Missing placeholder %2 for 'missing'@@", outputs[0].second);

    EXPECT_NO_THROW(Formatter(isc::log::INFO,
                              s("Too many arguments in %1 %2"), this).
                    arg("only one"));
    ASSERT_EQ(2, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[1].first);
    EXPECT_EQ("Too many arguments in only one %2 "
              "@@Excess logger placeholders still exist@@",
              outputs[1].second);

    EXPECT_NO_THROW(Formatter(isc::log::INFO, s("Missing the first %2"), this).
                    arg("missing").arg("argument"));
    ASSERT_EQ(3, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[2].first);
    EXPECT_EQ("Missing the first argument "
              "@@Missing placeholder %1 for 'missing'@@", outputs[2].second);
}

#endif /* ENABLE_LOGGER_CHECKS */

// Can replace multiple placeholders
TEST_F(FormatterTest, multiPlaceholder) {
    Formatter(isc::log::INFO, s("The %1 is the %1"), this).
        arg("first rule of tautology club");
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("The first rule of tautology club is "
              "the first rule of tautology club", outputs[0].second);
}

// Test we can cope with replacement containing the placeholder
TEST_F(FormatterTest, noRecurse) {
    // If we recurse, this will probably eat all the memory and crash
    Formatter(isc::log::INFO, s("%1"), this).arg("%1 %1");
    ASSERT_EQ(1, outputs.size());
    EXPECT_EQ(isc::log::INFO, outputs[0].first);
    EXPECT_EQ("%1 %1", outputs[0].second);
}

}
