package com.evsuite.abrp;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInstaller;
import android.util.Log;
import android.widget.Toast;

/**
 * Where a {@link PackageInstaller} session reports what it did — UNSTABLE BUILDS ONLY.
 *
 * The session commit is asynchronous, so unlike the {@code pm install -r} it replaced, the
 * install outcome cannot be the return value of the call that started it. It arrives here.
 *
 * STATUS_PENDING_USER_ACTION is the case worth understanding: the platform is saying it will
 * install, but wants the driver to confirm. That happens when the app is not granted a silent
 * install, and the only correct response is to launch the confirmation activity it hands us.
 *
 * Any other failure — on the car the session is refused, "Not allowed to install non-system
 * apps on internal storage", and that answer can come here rather than as an exception — opens
 * Android's installer screen with the verified APK, as {@link OtaUpdater#install} does for an
 * immediate refusal. Only a cancel by the driver ends there.
 */
public final class OtaInstallResultReceiver extends BroadcastReceiver {

    static final String ACTION_INSTALL_RESULT = "com.stinnesbeck.nilsmg4.OTA_INSTALL_RESULT";
    static final String EXTRA_APK = "com.stinnesbeck.nilsmg4.extra.APK";
    static final String EXTRA_SESSION = "com.stinnesbeck.nilsmg4.extra.SESSION";

    private static final String TAG = "EVABRP.Update";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent == null) return;
        int status = intent.getIntExtra(PackageInstaller.EXTRA_STATUS, PackageInstaller.STATUS_FAILURE);
        String message = intent.getStringExtra(PackageInstaller.EXTRA_STATUS_MESSAGE);
        Log.i(TAG, "OTA install result: status=" + status + " msg=" + message);
        UpdateLog.record(context, "Install result: status " + status
                + (message != null ? ", " + message : ""));
        int session = intent.getIntExtra(EXTRA_SESSION, -1);
        if (session >= 0) OtaUpdater.noteAnswer(session);
        String apkPath = intent.getStringExtra(EXTRA_APK);

        switch (status) {
            case PackageInstaller.STATUS_PENDING_USER_ACTION:
                Intent confirm = intent.getParcelableExtra(Intent.EXTRA_INTENT);
                if (confirm == null) {
                    UpdateLog.record(context, "No confirmation screen offered");
                    openInstallerScreen(context, apkPath, "no confirm intent");
                    return;
                }
                confirm.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                try {
                    context.startActivity(confirm);
                } catch (Throwable t) {
                    Log.e(TAG, "OTA confirm UI failed: " + t.getMessage());
                    UpdateLog.record(context, "Confirmation screen failed: " + t.getClass().getSimpleName());
                    openInstallerScreen(context, apkPath, t.getClass().getSimpleName());
                }
                break;
            case PackageInstaller.STATUS_SUCCESS:
                toast(context, context.getString(R.string.ota_install_success));
                break;
            case PackageInstaller.STATUS_FAILURE_ABORTED:
                // The driver cancelled: nothing opens again.
                toast(context, context.getString(R.string.ota_install_failed,
                        message != null ? message : "cancelled"));
                break;
            default:
                // The status message is the package manager's own words — INSTALL_FAILED_*
                // and friends — kept verbatim in the update log, because guessing at it is what
                // made an earlier failure unreadable. Then the installer screen, which the car
                // allows where it refuses the session.
                openInstallerScreen(context, apkPath, message != null ? message : "status " + status);
                break;
        }
    }

    /**
     * Opens Android's installer screen for the APK at [apkPath] off the main thread (it is
     * copied to Downloads first); a toast with [why] when there is none or it cannot open.
     */
    private void openInstallerScreen(Context context, String apkPath, String why) {
        java.io.File apk = apkPath == null ? null : new java.io.File(apkPath);
        if (apk == null || !apk.isFile()) {
            toast(context, context.getString(R.string.ota_install_failed, why));
            return;
        }
        PendingResult pending = goAsync();
        Context app = context.getApplicationContext();
        new Thread(() -> {
            try {
                if (!OtaUpdater.openInstallerScreen(app, apk)) {
                    new android.os.Handler(android.os.Looper.getMainLooper()).post(() ->
                            toast(app, app.getString(R.string.ota_install_failed, why)));
                }
            } finally {
                pending.finish();
            }
        }, "ota-fallback").start();
    }

    private static void toast(Context context, String text) {
        Toast.makeText(context.getApplicationContext(), text, Toast.LENGTH_LONG).show();
    }
}