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

// Build an executable that imports a project-local .cppm module, then run
// it and check the produced output. Exercises the within-project module
// dependency path (main.cpp imports Greeter, resolved through cfg.interfaces).
int main() {
    Configuration cfg;
    cfg.path = fs::current_path() / "tests" / "ModuleInterface" / "fixture";
    cfg.name = "greeter-app";
    cfg.outputName = "greeter-app";
    cfg.target = HostTarget();
    cfg.type = ConfigurationType::Executable;

    std::array<fs::path, 1> ifaces = { "Greeter" };
    std::array<fs::path, 1> impls  = { "main" };
    cfg.GetInterfacesAndImplementations(ifaces, impls);

    // Implementation should have picked up the import Greeter; through the
    // interface list resolution in GetInterfacesAndImplementations.
    if (cfg.implementations.size() != 1) {
        std::println(std::cerr, "expected 1 implementation, got {}", cfg.implementations.size());
        return 1;
    }
    if (cfg.implementations[0].moduleDependencies.size() != 1) {
        std::println(std::cerr,
            "expected main.cpp to depend on 1 module, got {}",
            cfg.implementations[0].moduleDependencies.size());
        return 1;
    }
    if (cfg.implementations[0].moduleDependencies[0]->name != "Greeter") {
        std::println(std::cerr,
            "expected dep 'Greeter', got '{}'",
            cfg.implementations[0].moduleDependencies[0]->name);
        return 1;
    }

    std::unordered_map<fs::path, std::shared_future<BuildResult>> depResults;
    std::mutex depMutex;
    BuildResult r = Build(cfg, depResults, depMutex);
    if (!r.result.empty()) {
        std::println(std::cerr, "build failed: {}", r.result);
        return 1;
    }

    fs::path bin = cfg.BinDir() / "greeter-app";
    if (!fs::exists(bin)) {
        std::println(std::cerr, "binary not produced at {}", bin.string());
        return 1;
    }

    auto run = RunCommandWithTimeout(bin.string(), std::chrono::seconds(10));
    if (run.exitCode != 0 || run.timedOut || run.crashed) {
        std::println(std::cerr, "binary did not exit cleanly: exit={} output={}",
            run.exitCode, run.output);
        return 1;
    }
    if (run.output != "ok-from-module") {
        std::println(std::cerr, "unexpected output: '{}'", run.output);
        return 1;
    }
    return 0;
}