/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

UnitTest::UnitTest (const String& nm, const String& ctg)
    : name (nm), category (ctg)
{
    getAllTests().add (this);
}

UnitTest::~UnitTest()
{
    getAllTests().removeFirstMatchingValue (this);
}

Array<UnitTest*>& UnitTest::getAllTests()
{
    static Array<UnitTest*> tests;
    return tests;
}

Array<UnitTest*> UnitTest::getTestsInCategory (const String& category)
{
    if (category.isEmpty())
        return getAllTests();

    Array<UnitTest*> unitTests;

    for (auto* test : getAllTests())
        if (test->getCategory() == category)
            unitTests.add (test);

    return unitTests;
}

StringArray UnitTest::getAllCategories()
{
    StringArray categories;

    for (auto* test : getAllTests())
        if (test->getCategory().isNotEmpty())
            categories.addIfNotAlreadyThere (test->getCategory());

    return categories;
}

void UnitTest::initialise()  {}
void UnitTest::shutdown()   {}

void UnitTest::performTest (UnitTestRunner* const newRunner)
{
    jassert (newRunner != nullptr);
    runner = newRunner;

    initialise();
    runTest();
    shutdown();
}

void UnitTest::logMessage (const String& message)
{
    // This method's only valid while the test is being run!
    jassert (runner != nullptr);

    runner->logMessage (message);
}

void UnitTest::beginTest (const String& testName)
{
    // This method's only valid while the test is being run!
    jassert (runner != nullptr);

    runner->beginNewTest (this, testName);
}

void UnitTest::expect (const bool result, const String& failureMessage)
{
    // This method's only valid while the test is being run!
    jassert (runner != nullptr);

    if (result)
        runner->addPass();
    else
        runner->addFail (failureMessage);
}

Random UnitTest::getRandom() const
{
    // This method's only valid while the test is being run!
    jassert (runner != nullptr);

    return runner->randomForTest;
}

//==============================================================================
UnitTestRunner::UnitTestRunner() {}
UnitTestRunner::~UnitTestRunner() {}

void UnitTestRunner::setAssertOnFailure (bool shouldAssert) noexcept
{
    assertOnFailure = shouldAssert;
}

void UnitTestRunner::setPassesAreLogged (bool shouldDisplayPasses) noexcept
{
    logPasses = shouldDisplayPasses;
}

int UnitTestRunner::getNumResults() const noexcept
{
    return results.size();
}

const UnitTestRunner::TestResult* UnitTestRunner::getResult (int index) const noexcept
{
    return results [index];
}

void UnitTestRunner::resultsUpdated()
{
}

void UnitTestRunner::runTests (const Array<UnitTest*>& tests, int64 randomSeed)
{
    results.clear();
    resultsUpdated();

    if (randomSeed == 0)
        randomSeed = Random().nextInt (0x7ffffff);

    randomForTest = Random (randomSeed);
    logMessage ("Random seed: 0x" + String::toHexString (randomSeed));

    for (auto* t : tests)
    {
        if (shouldAbortTests())
            break;

       #if JUCE_EXCEPTIONS_DISABLED
        t->performTest (this);
       #else
        try
        {
            t->performTest (this);
        }
        catch (...)
        {
            addFail ("An unhandled exception was thrown!");
        }
       #endif
    }

    endTest();
}

void UnitTestRunner::runAllTests (int64 randomSeed)
{
    runTests (UnitTest::getAllTests(), randomSeed);
}

void UnitTestRunner::runTestsInCategory (const String& category, int64 randomSeed)
{
    runTests (UnitTest::getTestsInCategory (category), randomSeed);
}

void UnitTestRunner::logMessage (const String& message)
{
    Logger::writeToLog (message);
}

bool UnitTestRunner::shouldAbortTests()
{
    return false;
}

void UnitTestRunner::beginNewTest (UnitTest* const test, const String& subCategory)
{
    endTest();
    currentTest = test;

    auto* r = new TestResult();
    results.add (r);
    r->unitTestName = test->getName();
    r->subcategoryName = subCategory;
    r->passes = 0;
    r->failures = 0;

    logMessage ("-----------------------------------------------------------------");
    logMessage ("Starting test: " + r->unitTestName + " / " + subCategory + "...");

    resultsUpdated();
}

void UnitTestRunner::endTest()
{
    if (auto* r = results.getLast())
    {
        if (r->failures > 0)
        {
            String m ("FAILED!!  ");
            m << r->failures << (r->failures == 1 ? " test" : " tests")
              << " failed, out of a total of " << (r->passes + r->failures);

            logMessage (String());
            logMessage (m);
            logMessage (String());
        }
        else
        {
            logMessage ("All tests completed successfully");
        }
    }
}

void UnitTestRunner::addPass()
{
    {
        const ScopedLock sl (results.getLock());

        auto* r = results.getLast();
        jassert (r != nullptr); // You need to call UnitTest::beginTest() before performing any tests!

        r->passes++;

        if (logPasses)
        {
            String message ("Test ");
            message << (r->failures + r->passes) << " passed";
            logMessage (message);
        }
    }

    resultsUpdated();
}

void UnitTestRunner::addFail (const String& failureMessage)
{
    {
        const ScopedLock sl (results.getLock());

        auto* r = results.getLast();
        jassert (r != nullptr); // You need to call UnitTest::beginTest() before performing any tests!

        r->failures++;

        String message ("!!! Test ");
        message << (r->failures + r->passes) << " failed";

        if (failureMessage.isNotEmpty())
            message << ": " << failureMessage;

        r->messages.add (message);

        logMessage (message);
    }

    resultsUpdated();

    if (assertOnFailure) { jassertfalse; }
}

} // namespace juce
