/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2025 Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "filesettings.h"
#include "fixture.h"
#include "helpers.h"
#include "redirect.h"
#include "settings.h"
#include "standards.h"
#include "suppressions.h"
#include "threadexecutor.h"
#include "timer.h"

#include <cstdlib>
#include <list>
#include <memory>
#include <sstream>
#include <string>
#include <utility>
#include <vector>

class TestThreadExecutorBase : public TestFixture {
public:
    TestThreadExecutorBase(const char * const name, bool useFS) : TestFixture(name), useFS(useFS) {}

private:
    /*const*/ Settings settings = settingsBuilder().library("std.cfg").build();
    bool useFS;

    std::string fprefix() const
    {
        if (useFS)
            return "threadfs";
        return "thread";
    }

    struct CheckOptions
    {
        CheckOptions() = default;
        bool quiet = true;
        SHOWTIME_MODES showtime = SHOWTIME_MODES::SHOWTIME_NONE;
        const char* plistOutput = nullptr;
        std::vector<std::string> filesList;
        bool clangTidy = false;
        bool executeCommandCalled = false;
        std::string exe;
        std::vector<std::string> args;
    };

    /**
     * Execute check using n jobs for y files which are have
     * identical data, given within data.
     */
    void check(unsigned int jobs, int files, int result, const std::string &data, const CheckOptions& opt = make_default_obj{}) {
        std::list<FileSettings> fileSettings;

        std::list<FileWithDetails> filelist;
        if (opt.filesList.empty()) {
            for (int i = 1; i <= files; ++i) {
                std::string f_s = fprefix() + "_" + std::to_string(i) + ".cpp";
                filelist.emplace_back(f_s, Standards::Language::CPP, data.size());
                if (useFS) {
                    fileSettings.emplace_back(std::move(f_s), Standards::Language::CPP, data.size());
                }
            }
        }
        else {
            for (const auto& f : opt.filesList)
            {
                filelist.emplace_back(f, Standards::Language::CPP, data.size());
                if (useFS) {
                    fileSettings.emplace_back(f, Standards::Language::CPP, data.size());
                }
            }
        }

        /*const*/ Settings s = settings;
        s.jobs = jobs;
        s.showtime = opt.showtime;
        s.quiet = opt.quiet;
        if (opt.plistOutput)
            s.plistOutput = opt.plistOutput;
        s.clangTidy = opt.clangTidy;

        Suppressions supprs;

        bool executeCommandCalled = false;
        std::string exe;
        std::vector<std::string> args;
        // NOLINTNEXTLINE(performance-unnecessary-value-param)
        auto executeFn = [&executeCommandCalled, &exe, &args](std::string e,std::vector<std::string> a,std::string,std::string&){
            executeCommandCalled = true;
            exe = std::move(e);
            args = std::move(a);
            return EXIT_SUCCESS;
        };

        std::vector<std::unique_ptr<ScopedFile>> scopedfiles;
        scopedfiles.reserve(filelist.size());
        for (auto i = filelist.cbegin(); i != filelist.cend(); ++i)
            scopedfiles.emplace_back(new ScopedFile(i->path(), data));

        // clear files list so only fileSettings are used
        if (useFS)
            filelist.clear();

        ThreadExecutor executor(filelist, fileSettings, s, supprs, *this, executeFn);
        ASSERT_EQUALS(result, executor.check());
        ASSERT_EQUALS(opt.executeCommandCalled, executeCommandCalled);
        ASSERT_EQUALS(opt.exe, exe);
        ASSERT_EQUALS(opt.args.size(), args.size());
        for (std::size_t i = 0; i < args.size(); ++i)
        {
            ASSERT_EQUALS(opt.args[i], args[i]);
        }
    }

    void run() override {
        TEST_CASE(deadlock_with_many_errors);
        TEST_CASE(many_threads);
        TEST_CASE(many_threads_showtime);
        TEST_CASE(many_threads_plist);
        TEST_CASE(no_errors_more_files);
        TEST_CASE(no_errors_less_files);
        TEST_CASE(no_errors_equal_amount_files);
        TEST_CASE(one_error_less_files);
        TEST_CASE(one_error_several_files);
        TEST_CASE(clangTidy);
        TEST_CASE(showtime_top5_file);
        TEST_CASE(showtime_top5_summary);
        TEST_CASE(showtime_file);
        TEST_CASE(showtime_summary);
        TEST_CASE(showtime_file_total);
        TEST_CASE(suppress_error_library);
        TEST_CASE(unique_errors);
    }

    void deadlock_with_many_errors() {
        std::ostringstream oss;
        oss << "int main()\n"
            << "{\n";
        const int num_err = 1;
        for (int i = 0; i < num_err; i++) {
            oss << "  {int i = *((int*)0);}\n";
        }
        oss << "  return 0;\n"
            << "}\n";
        const int num_files = 3;
        check(2, num_files, num_files, oss.str());
        ASSERT_EQUALS(1LL * num_err * num_files, cppcheck::count_all_of(errout_str(), "(error) Null pointer dereference: (int*)0"));
    }

    void many_threads() {
        const int num_files = 100;
        check(16, num_files, num_files,
              "int main()\n"
              "{\n"
              "  int i = *((int*)0);\n"
              "  return 0;\n"
              "}");
        ASSERT_EQUALS(num_files, cppcheck::count_all_of(errout_str(), "(error) Null pointer dereference: (int*)0"));
    }

    // #11249 - reports TSAN errors - only applies to threads not processes though
    void many_threads_showtime() {
        SUPPRESS;
        check(16, 100, 100,
              "int main()\n"
              "{\n"
              "  int i = *((int*)0);\n"
              "  return 0;\n"
              "}", dinit(CheckOptions, $.showtime = SHOWTIME_MODES::SHOWTIME_SUMMARY));
        // we are not interested in the results - so just consume them
        ignore_errout();
    }

    void many_threads_plist() {
        const std::string plistOutput = "plist_" + fprefix() + "/";
        ScopedFile plistFile("dummy", "", plistOutput);

        check(16, 100, 100,
              "int main()\n"
              "{\n"
              "  int i = *((int*)0);\n"
              "  return 0;\n"
              "}", dinit(CheckOptions, $.plistOutput = plistOutput.c_str()));
        // we are not interested in the results - so just consume them
        ignore_errout();
    }

    void no_errors_more_files() {
        check(2, 3, 0,
              "int main()\n"
              "{\n"
              "  return 0;\n"
              "}");
    }

    void no_errors_less_files() {
        check(2, 1, 0,
              "int main()\n"
              "{\n"
              "  return 0;\n"
              "}");
    }

    void no_errors_equal_amount_files() {
        check(2, 2, 0,
              "int main()\n"
              "{\n"
              "  return 0;\n"
              "}");
    }

    void one_error_less_files() {
        check(2, 1, 1,
              "int main()\n"
              "{\n"
              "  {int i = *((int*)0);}\n"
              "  return 0;\n"
              "}");
        ASSERT_EQUALS("[" + fprefix() + "_1.cpp:3]: (error) Null pointer dereference: (int*)0\n", errout_str());
    }

    void one_error_several_files() {
        const int num_files = 20;
        check(2, num_files, num_files,
              "int main()\n"
              "{\n"
              "  {int i = *((int*)0);}\n"
              "  return 0;\n"
              "}");
        ASSERT_EQUALS(num_files, cppcheck::count_all_of(errout_str(), "(error) Null pointer dereference: (int*)0"));
    }

    void clangTidy() {
        // TODO: we currently only invoke it with ImportProject::FileSettings
        if (!useFS)
            return;

#ifdef _WIN32
        constexpr char exe[] = "clang-tidy.exe";
#else
        constexpr char exe[] = "clang-tidy";
#endif

        const std::string file = fprefix() + "_1.cpp";
        check(2, 1, 0,
              "int main()\n"
              "{\n"
              "  return 0;\n"
              "}",
              dinit(CheckOptions,
                    $.quiet = false,
                        $.clangTidy = true,
                        $.executeCommandCalled = true,
                        $.exe = exe,
                        $.args = {"-quiet", "-checks=*,-clang-analyzer-*,-llvm*", file, "--"}));
        ASSERT_EQUALS("Checking " + file + " ...\n", output_str());
    }

    // TODO: provide data which actually shows values above 0

    // TODO: should this be logged only once like summary?
    void showtime_top5_file() {
        REDIRECT; // should not cause TSAN failures as the showtime logging is synchronized
        check(2, 2, 0,
              "int main() {}",
              dinit(CheckOptions,
                    $.showtime = SHOWTIME_MODES::SHOWTIME_TOP5_FILE));
        // for each file: top5 results + overall + empty line
        const std::string output_s = GET_REDIRECT_OUTPUT;
        // for each file: top5 results + overall + empty line
        ASSERT_EQUALS((5 + 1 + 1) * 2LL, cppcheck::count_all_of(output_s, '\n'));
    }

    void showtime_top5_summary() {
        REDIRECT;
        check(2, 2, 0,
              "int main() {}",
              dinit(CheckOptions,
                    $.showtime = SHOWTIME_MODES::SHOWTIME_TOP5_SUMMARY));
        const std::string output_s = GET_REDIRECT_OUTPUT;
        // once: top5 results + overall + empty line
        ASSERT_EQUALS(5 + 1 + 1, cppcheck::count_all_of(output_s, '\n'));
        // should only report the top5 once
        ASSERT(output_s.find("1 result(s)") == std::string::npos);
        ASSERT(output_s.find("2 result(s)") != std::string::npos);
    }

    void showtime_file() {
        REDIRECT; // should not cause TSAN failures as the showtime logging is synchronized
        check(2, 2, 0,
              "int main() {}",
              dinit(CheckOptions,
                    $.showtime = SHOWTIME_MODES::SHOWTIME_FILE));
        const std::string output_s = GET_REDIRECT_OUTPUT;
        ASSERT_EQUALS(2, cppcheck::count_all_of(output_s, "Overall time:"));
    }

    void showtime_summary() {
        REDIRECT; // should not cause TSAN failures as the showtime logging is synchronized
        check(2, 2, 0,
              "int main() {}",
              dinit(CheckOptions,
                    $.showtime = SHOWTIME_MODES::SHOWTIME_SUMMARY));
        const std::string output_s = GET_REDIRECT_OUTPUT;
        // should only report the actual summary once
        ASSERT(output_s.find("1 result(s)") == std::string::npos);
        ASSERT(output_s.find("2 result(s)") != std::string::npos);
    }

    void showtime_file_total() {
        REDIRECT; // should not cause TSAN failures as the showtime logging is synchronized
        check(2, 2, 0,
              "int main() {}",
              dinit(CheckOptions,
                    $.showtime = SHOWTIME_MODES::SHOWTIME_FILE_TOTAL));
        const std::string output_s = GET_REDIRECT_OUTPUT;
        ASSERT(output_s.find("Check time: " + fprefix() + "_1.cpp: ") != std::string::npos);
        ASSERT(output_s.find("Check time: " + fprefix() + "_2.cpp: ") != std::string::npos);
    }

    void suppress_error_library() {
        SUPPRESS;
        const Settings settingsOld = settings;
        const char xmldata[] = R"(<def format="2"><markup ext=".cpp" reporterrors="false"/></def>)";
        settings = settingsBuilder().libraryxml(xmldata).build();
        check(2, 1, 0,
              "int main()\n"
              "{\n"
              "  int i = *((int*)0);\n"
              "  return 0;\n"
              "}");
        ASSERT_EQUALS("", errout_str());
        settings = settingsOld;
    }

    void unique_errors() {
        SUPPRESS;
        ScopedFile inc_h(fprefix() + ".h",
                         "inline void f()\n"
                         "{\n"
                         "  (void)*((int*)0);\n"
                         "}");
        check(2, 2, 2,
              "#include \"" + inc_h.name() +"\"");
        // this is made unique by the executor
        ASSERT_EQUALS("[" + inc_h.name() + ":3]: (error) Null pointer dereference: (int*)0\n", errout_str());
    }

    // TODO: test whole program analysis
};

class TestThreadExecutorFiles : public TestThreadExecutorBase {
public:
    TestThreadExecutorFiles() : TestThreadExecutorBase("TestThreadExecutorFiles", false) {}
};

class TestThreadExecutorFS : public TestThreadExecutorBase {
public:
    TestThreadExecutorFS() : TestThreadExecutorBase("TestThreadExecutorFS", true) {}
};

REGISTER_TEST(TestThreadExecutorFiles)
REGISTER_TEST(TestThreadExecutorFS)