// 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;

// A CMake dependency's newest library decides when its consumers are stale
// (BuildExternal's latestArtifact). Only files directly in the CMake build
// directory named *.a or *.so were looked at, so msquic's
// bin/Release/libmsquic.so.2, in one of the dependency's libDirs and with a
// version after the .so, never counted: a rebuilt msquic left everything
// built against the old one in place.
//
// The dependency here is a local repository whose CMake project puts a
// versioned shared library in bin/Release, declared as a libDir. Everything
// is local; XDG_CACHE_HOME keeps the clone out of the real cache.

extern "C" int setenv(const char* name, const char* value, int overwrite);

namespace {
    std::int32_t failures = 0;

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

    void Git(const fs::path& dir, std::string_view args) {
        const std::string command = std::format("git -C {} {}", ShellQuote(dir.string()), args);
        auto result = RunCommandWithTimeout(command, std::chrono::seconds(60));
        if (result.exitCode != 0) throw std::runtime_error(std::format("{} failed: {}", command, result.output));
    }

    void Write(const fs::path& file, std::string_view text) {
        std::ofstream(file, std::ios::binary | std::ios::trunc) << text;
    }
}

int main() {
    const fs::path scratch = fs::temp_directory_path() / "crafter-build-external-artifact-time";
    fs::remove_all(scratch);
    fs::create_directories(scratch);
    setenv("XDG_CACHE_HOME", (scratch / "cache").c_str(), 1);
    setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
    setenv("GIT_CONFIG_GLOBAL", "/dev/null", 1);
    for (const char* name : { "GIT_AUTHOR_NAME", "GIT_COMMITTER_NAME" }) setenv(name, "crafter-build test", 1);
    for (const char* name : { "GIT_AUTHOR_EMAIL", "GIT_COMMITTER_EMAIL" }) setenv(name, "test@example.invalid", 1);

    const fs::path repo = scratch / "versioned";
    fs::create_directories(repo);
    Write(repo / "lib.c", "int Versioned(void) { return 2; }\n");
    Write(repo / "CMakeLists.txt",
          "cmake_minimum_required(VERSION 3.16)\n"
          "project(versioned C)\n"
          "add_library(versioned SHARED lib.c)\n"
          "set_target_properties(versioned PROPERTIES VERSION 2.0.0 SOVERSION 2\n"
          "    LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin/Release)\n");
    Git(repo, "init -q -b main");
    Git(repo, "add .");
    Git(repo, "commit -q -m versioned");

    ExternalDependency dep;
    dep.name = "versioned";
    dep.source.url = std::format("file://{}", repo.string());
    dep.builder = ExternalBuilder::CMake;
    dep.libDirs = { "bin/Release" };
    dep.libs = { "versioned" };
    std::atomic<bool> cancelled = false;
    const ExternalBuildResult result = BuildExternal(dep, HostTarget(), cancelled);
    Check(result.error.empty(), std::format("the dependency builds: {}", result.error));

    const fs::path library = ExternalCloneDir(dep, HostTarget()) / "build" / "bin" / "Release" / "libversioned.so.2.0.0";
    Check(fs::exists(library), std::format("the library is where its CMake project puts it: {}", library.string()));
    if (fs::exists(library)) {
        Check(result.latestArtifact == fs::last_write_time(library), "its newest artifact is the versioned library in the libDir");
    }

    std::error_code ec;
    fs::remove_all(scratch, ec);
    if (failures > 0) {
        std::println(std::cerr, "{} assertions failed", failures);
        return 1;
    }
    return 0;
}