// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <algorithm>
#include <cstdlib>
#include <memory>
#include <utility>

#include <fbl/auto_call.h>
#include <zircon/assert.h>
#include <zxtest/base/test-case.h>

namespace zxtest {

namespace {

using internal::SetUpTestCaseFn;
using internal::TearDownTestCaseFn;
using internal::TestDriver;
using internal::TestStatus;

} // namespace

TestCase::TestCase(const fbl::String& name, SetUpTestCaseFn set_up, TearDownTestCaseFn tear_down)
    : name_(name), set_up_(std::move(set_up)), tear_down_(std::move(tear_down)) {
    ZX_ASSERT_MSG(set_up_, "Invalid SetUpTestCaseFn");
    ZX_ASSERT_MSG(tear_down_, "Invalid TearDownTestCaseFn");
}
TestCase::TestCase(TestCase&& other) = default;
TestCase::~TestCase() = default;

size_t TestCase::TestCount() const {
    return test_infos_.size();
}

size_t TestCase::MatchingTestCount() const {
    return selected_indexes_.size();
}

void TestCase::Filter(TestCase::FilterFn filter) {
    fbl::Vector<unsigned long> filtered_indexes;
    filtered_indexes.reserve(test_infos_.size());
    for (unsigned long i = 0; i < test_infos_.size(); ++i) {
        const auto& test_info = test_infos_[i];
        if (!filter || filter(name_, test_info.name())) {
            filtered_indexes.push_back(i);
        }
    }
    selected_indexes_.swap(filtered_indexes);
}

void TestCase::Shuffle(std::uint32_t random_seed) {
    for (unsigned long i = 1; i < selected_indexes_.size(); ++i) {
        unsigned long j = rand_r(&random_seed) % (i + 1);
        if (j != i) {
            std::swap(selected_indexes_[i], selected_indexes_[j]);
        }
    }
}

void TestCase::UnShuffle() {
    for (unsigned long i = 0; i < selected_indexes_.size(); ++i) {
        selected_indexes_[i] = i;
    }
}

bool TestCase::RegisterTest(const fbl::String& name, const SourceLocation& location,
                            internal::TestFactory factory) {
    auto it = std::find_if(test_infos_.begin(), test_infos_.end(),
                           [&name](const TestInfo& info) { return info.name() == name; });

    // Test already registered.
    if (it != test_infos_.end()) {
        return false;
    }

    selected_indexes_.push_back(selected_indexes_.size());
    test_infos_.push_back(TestInfo(name, location, std::move(factory)));
    return true;
}

void TestCase::Run(LifecycleObserver* event_broadcaster, TestDriver* driver) {
    auto tear_down = fbl::MakeAutoCall([this, event_broadcaster] {
        tear_down_();
        event_broadcaster->OnTestCaseEnd(*this);
    });
    event_broadcaster->OnTestCaseStart(*this);
    set_up_();

    if (!driver->Continue()) {
        return;
    }

    for (unsigned long i = 0; i < selected_indexes_.size(); ++i) {
        const auto& test_info = test_infos_[selected_indexes_[i]];
        std::unique_ptr<Test> test = test_info.Instantiate(driver);
        event_broadcaster->OnTestStart(*this, test_info);
        test->Run();
        switch (driver->Status()) {
        case TestStatus::kPassed:
            event_broadcaster->OnTestSuccess(*this, test_info);
            break;
        case TestStatus::kSkipped:
            event_broadcaster->OnTestSkip(*this, test_info);
            break;
        case TestStatus::kFailed:
            event_broadcaster->OnTestFailure(*this, test_info);
            break;
        default:
            break;
        }
    }
}

} // namespace zxtest