// SPDX-License-Identifier: LGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®

import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;

// `crafter-build clean` exists so the fix for a stale build is discoverable
// rather than folklore. It must not need the project to load: the state you most
// want to clear is one where the build is already broken.
namespace {
    std::int32_t Failures = 0;

    void Check(bool cond, std::string_view msg) {
        if (!cond) {
            std::println(std::cerr, "FAIL: {}", msg);
            ++Failures;
        }
    }

    fs::path StageProject(std::string_view leaf) {
        fs::path root = fs::temp_directory_path() / std::format("crafter-build-clean-{}", leaf);
        fs::remove_all(root);
        fs::create_directories(root / "bin" / "app-x86_64-pc-linux-gnu-native-native-0badf00d");
        fs::create_directories(root / "build" / "app-x86_64-pc-linux-gnu-native-native-0badf00d");
        std::ofstream(root / "bin" / "app-x86_64-pc-linux-gnu-native-native-0badf00d" / "app") << "binary";
        std::ofstream(root / "build" / "app-x86_64-pc-linux-gnu-native-native-0badf00d" / "main_impl.o") << "object";
        std::ofstream(root / "keep-me.txt") << "untouched";
        return root;
    }
}

int main() {
    {
        // A project file that could never compile: clean has to work anyway.
        fs::path root = StageProject("broken");
        fs::path projectFile = root / "project.cpp";
        std::ofstream(projectFile) << "this is not valid C++ at all\n";

        std::vector<fs::path> removed = CleanProject(projectFile);
        Check(removed.size() == 2, std::format("both trees reported removed, got {}", removed.size()));
        Check(!fs::exists(root / "bin"), "bin/ is gone");
        Check(!fs::exists(root / "build"), "build/ is gone");
        Check(fs::exists(root / "keep-me.txt"), "unrelated files in the project root are left alone");
        Check(fs::exists(projectFile), "the project file itself is left alone");
    }

    {
        // Idempotent, and quiet about it — nothing to remove is not an error.
        fs::path root = StageProject("twice");
        fs::path projectFile = root / "project.cpp";
        std::ofstream(projectFile) << "\n";

        CleanProject(projectFile);
        std::vector<fs::path> second = CleanProject(projectFile);
        Check(second.empty(), "a second clean reports nothing removed");
    }

    {
        // Resolved relative to the project file, not the cwd, so --project=
        // cleans the project it names.
        fs::path root = StageProject("elsewhere");
        fs::path projectFile = root / "project.cpp";
        std::ofstream(projectFile) << "\n";
        fs::path cwdBin = fs::current_path() / "bin";
        bool cwdBinExisted = fs::exists(cwdBin);

        CleanProject(projectFile);
        Check(!fs::exists(root / "bin"), "the named project's bin/ is gone");
        Check(fs::exists(cwdBin) == cwdBinExisted, "the cwd's bin/ is untouched");
    }

    if (Failures > 0) {
        std::println(std::cerr, "{} assertions failed", Failures);
        return 1;
    }
    return 0;
}