/*
Crafter® Build
Copyright (C) 2026 Catcrafts®
Catcrafts.net

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License version 3.0 as published by the Free Software Foundation;

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
*/

module Crafter.Build:Implementation_impl;
import std;
import :Implementation;
import :Interface;
import :Platform;
namespace fs = std::filesystem;

namespace Crafter {
    Implementation::Implementation(fs::path&& path) : path(std::move(path)) {

    }
    bool Implementation::Check(const fs::path& buildDir, const fs::path& pcmDir, fs::file_time_type sourceFloor) const {
        std::string objPath = (buildDir/path.filename()).string()+"_impl.o";
        std::string cppPath = path.string()+".cpp";
        if(!fs::exists(objPath) || std::max(fs::last_write_time(cppPath), sourceFloor) >= fs::last_write_time(objPath)) {
            return true;
        }
        fs::file_time_type objTime = fs::last_write_time(objPath);
        for(ModulePartition* dependency : partitionDependencies) {
            if(dependency->Check(pcmDir, sourceFloor)) return true;
        }
        for(Module* dependency : moduleDependencies) {
            if(dependency->Check(pcmDir, sourceFloor)) return true;
        }
        for(const auto& [externalMod, externalPcmPath] : externalModuleDependencies) {
            std::error_code ec;
            fs::file_time_type pcmTime = fs::last_write_time(externalPcmPath, ec);
            if (!ec && pcmTime >= objTime) return true;
        }
        return false;
    }
    void Implementation::Compile(const std::string_view clang, const fs::path& buildDir, std::atomic<bool>& buildCancelled, std::string& buildError) const {
        for(ModulePartition* dependency : partitionDependencies) {
            if(!dependency->compiled.load()) {
                dependency->compiled.wait(false);
            }
        }
        for(Module* dependency : moduleDependencies) {
            if(!dependency->compiled.load()) {
                dependency->compiled.wait(false);
            }
        }

        if (buildCancelled.load(std::memory_order_relaxed)) {
            return;
        }

        std::string result = RunCommand(std::format("{} {}.cpp -c -o {}_impl.o", clang, path.string(), (buildDir/path.filename()).string()));

        bool expected = false;
        if(!result.empty() && buildCancelled.compare_exchange_strong(expected, true)) {
            buildError = std::move(result);
        }
    }
}