#include "auth.hpp"
#include "collection_registry.hpp"
#include "config.hpp"
#include "db_gateway.hpp"
#include "key_store.hpp"
#include "server.hpp"
#include "settings_store.hpp"
#include <svapi/version.hpp>
#include <spdlog/spdlog.h>
#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#else
#define sd_notify(u, s) do {} while (0)
#endif
#include <atomic>
#include <chrono>
#include <csignal>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <thread>

namespace {
std::atomic<bool> g_running{true};
void onSignal(int) { g_running = false; }
std::string envOr(const char* k, const std::string& dflt = "") { const char* v = std::getenv(k); return v ? std::string(v) : dflt; }
}

int main(int argc, char** argv) {
    std::string configPath = "/etc/smartbotic-vectorapi/config.json";
    std::string webuiDirOverride;
    std::string shareDir = "/usr/share/smartbotic-vectorapi";
    for (int i = 1; i < argc; ++i) {
        if (std::strcmp(argv[i], "--config") == 0 && i + 1 < argc) configPath = argv[++i];
        else if (std::strcmp(argv[i], "--webui-dir") == 0 && i + 1 < argc) webuiDirOverride = argv[++i];
        else if (std::strcmp(argv[i], "--share-dir") == 0 && i + 1 < argc) shareDir = argv[++i];
        else if (std::strcmp(argv[i], "--version") == 0 || std::strcmp(argv[i], "-v") == 0) {
            std::cout << "smartbotic-vectorapi " << svapi::VERSION << " (" << svapi::GIT_COMMIT << ")\n";
            return 0;
        }
    }

    svapi::Config cfg;
    try { cfg = svapi::Config::load(configPath); }
    catch (const std::exception& e) { std::cerr << "config error: " << e.what() << "\n"; return 1; }
    spdlog::set_level(spdlog::level::from_str(cfg.logLevel));
    if (!webuiDirOverride.empty()) cfg.webuiDir = webuiDirOverride;

    std::signal(SIGINT, onSignal); std::signal(SIGTERM, onSignal); std::signal(SIGPIPE, SIG_IGN);

    svapi::DbGateway db(cfg.dbAddress);
    spdlog::info("connecting to smartbotic-database at {}", cfg.dbAddress);
    for (int i = 0; i < 30 && !db.connect(); ++i) std::this_thread::sleep_for(std::chrono::seconds(1));
    if (!db.healthy()) { spdlog::error("database not reachable at {}", cfg.dbAddress); return 1; }

    svapi::SettingsStore settings(db);
    settings.bootstrap(envOr("OPENAI_API_KEY"));
    settings.startWatch();

    svapi::KeyStore keys(db);
    keys.bootstrap(envOr("SMARTBOTIC_VECTORAPI_KEY"));
    keys.startWatch();

    svapi::CollectionRegistry registry(db);
    const std::string defProj = settings.snapshot()->defaultProject;
    db.ensureProject(defProj);
    // Re-open EVERY project's collection registry at startup. The DB only
    // surfaces a collection via find()/list() once it has been opened in the
    // current process, so without this a restart makes all collections vanish
    // from the API (GET /collections empty, document ops 404) even though the
    // data survives on disk. KeyStore::bootstrap already does this for
    // vectorapi_keys, which is why keys survive but the registry didn't. (issue #1)
    {
        auto projects = db.listProjects();  // always includes the default project
        registry.bootstrap(projects);
        spdlog::info("opened collection registry for {} project(s) at startup", projects.size());
    }

    svapi::SessionStore sessions(std::chrono::minutes(settings.snapshot()->sessionTtlMinutes));

    svapi::ServerDeps deps{db, settings, keys, registry, sessions, cfg.webuiDir, shareDir};
    svapi::ApiServer server(std::move(deps));
    server.registerRoutes();

    std::thread http([&] {
        spdlog::info("listening on {}:{}", cfg.httpBind, cfg.httpPort);
        if (!server.listen(cfg.httpBind, cfg.httpPort)) { spdlog::error("bind failed"); g_running = false; }
    });
    sd_notify(0, "READY=1");
    while (g_running) { sd_notify(0, "WATCHDOG=1"); std::this_thread::sleep_for(std::chrono::milliseconds(200)); }
    sd_notify(0, "STOPPING=1");
    server.stop();
    if (http.joinable()) http.join();
    return 0;
}