/* cst-agent-app: the Qt front end.
 *
 *   cst-agent-app --workspace DIR [--provider p] [--model m] [--api-key k]
 *   cst-agent-app --selftest      embedding checks, no window, no network
 *
 * The engine runs in this process (see app/README.md); nothing listens on a
 * port and no second process is started. */

#include <QCommandLineParser>
#include <QCoreApplication>
#include <QDir>
#include <QFileInfo>
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QStandardPaths>
#include <QTemporaryDir>
#include <QTextStream>
#include <QUrl>

#include <cstdio>
#include <cstring>

#include "core/AgentCore.h"
#include "core/ToolProvider.h"
#include "cst_version.h"

namespace {

int runSelftest() {
  QTextStream out(stdout);
  int bad = 0;
  QTemporaryDir tmp;
  if (!tmp.isValid()) {
    out << "selftest: cannot create a scratch dir\n";
    return 1;
  }
  AgentCore core;
  QString err;
  if (!core.open(tmp.path(), QStringLiteral("deepseek"),
                 QStringLiteral("deepseek-flash"), QStringLiteral("test-key"),
                 &err)) {
    out << "selftest: engine did not start: " << err << "\n";
    return 1;
  }
  out << "selftest: engine started in-process\n";
  if (core.agent() == nullptr) {
    out << "selftest: no agent handle\n";
    return 1;
  }
  /* the front end's own tools go through the engine's registry */
  const int n = app::registerPlatformTools(&core);
  out << "selftest: platform tools registered: " << n << "\n";
  const cst_tool_def_t *t = cst_tool_find("notification_send");
  if (!t) {
    out << "selftest: notification_send is not in the registry\n";
    bad++;
  } else {
    if (t->owner == nullptr || strncmp(t->owner, "app:", 4) != 0) {
      out << "selftest: notification_send has no app owner\n";
      bad++;
    }
    char why[160] = "";
    const bool ok = cst_tool_available(t, why, sizeof(why)) == 0;
    out << "selftest: notification_send available=" << (ok ? "yes" : "no")
        << (ok ? "" : QStringLiteral(" (%1)").arg(QString::fromUtf8(why)))
        << "\n";
  }
  /* the mode comes from the engine, not from the UI */
  core.setMode(QStringLiteral("general"));
  if (core.mode() != QLatin1String("general")) {
    out << "selftest: mode did not stick\n";
    bad++;
  }
  app::unregisterPlatformTools(&core);
  if (cst_tool_find("notification_send") != nullptr) {
    out << "selftest: platform tools were not dropped\n";
    bad++;
  }
  core.close();
  out << (bad ? "selftest: FAILED\n" : "selftest: OK\n");
  out.flush();
  return bad ? 1 : 0;
}

}  // namespace

int main(int argc, char **argv) {
  /* --selftest stays headless: no window, no QML, no display needed. */
  bool selftest = false;
  for (int i = 1; i < argc; i++)
    if (strcmp(argv[i], "--selftest") == 0)
      selftest = true;
  if (selftest) {
    QCoreApplication app(argc, argv);
    return runSelftest();
  }

  QGuiApplication app(argc, argv);
  QGuiApplication::setApplicationName(QStringLiteral("cst-agent-app"));
  QGuiApplication::setApplicationVersion(QStringLiteral(CST_VERSION));
  QGuiApplication::setOrganizationName(QStringLiteral("cst-agent"));

  QCommandLineParser parser;
  parser.setApplicationDescription(
      QStringLiteral("CST-agent desktop front end (engine in-process)"));
  parser.addHelpOption();
  parser.addVersionOption();
  QCommandLineOption wsOpt({QStringLiteral("w"), QStringLiteral("workspace")},
                           QStringLiteral("workspace directory"),
                           QStringLiteral("dir"));
  QCommandLineOption providerOpt(QStringLiteral("provider"),
                                 QStringLiteral("provider name"),
                                 QStringLiteral("name"));
  QCommandLineOption modelOpt(QStringLiteral("model"),
                              QStringLiteral("model name"), QStringLiteral("name"));
  QCommandLineOption planOpt(QStringLiteral("plan"),
                             QStringLiteral("start in plan mode"));
  parser.addOption(wsOpt);
  parser.addOption(providerOpt);
  parser.addOption(modelOpt);
  parser.addOption(planOpt);
  parser.process(app);

  QString ws = parser.value(wsOpt);
  if (ws.isEmpty())
    ws = QDir::currentPath();
  ws = QFileInfo(ws).absoluteFilePath();

  AgentCore core;
  QString err;
  if (!core.open(ws, parser.value(providerOpt), parser.value(modelOpt),
                 QString(), &err)) {
    QTextStream(stderr) << "cannot start the engine: " << err << "\n";
    return 1;
  }
  app::registerPlatformTools(&core); /* the app's own tools */
  if (parser.isSet(planOpt))
    core.setPlanMode(true);

  QQmlApplicationEngine engine;
  engine.rootContext()->setContextProperty(QStringLiteral("agent"), &core);
  const QUrl url(QStringLiteral("qrc:/qt/qml/CstAgent/qml/Main.qml"));
  QObject::connect(
      &engine, &QQmlApplicationEngine::objectCreated, &app,
      [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
          QCoreApplication::exit(-1);
      },
      Qt::QueuedConnection);
  engine.load(url);
  if (engine.rootObjects().isEmpty())
    return 1;
  return app.exec();
}