/*
 * mygram-droid: Android TV client for Foldergram.
 * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * This program 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 General Public License
 * for more details.
 */

package mygram.droid;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.text.InputType;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONObject;

/**
 * Gate shown on every start and return to the app: the PIN prompt when a PIN
 * is set, then a wait while Foldergram indexes, which makes it unusably slow.
 */
public final class SplashActivity extends Activity {
	private static final long POLL_MS = 5000;
	private final Handler handler = new Handler(Looper.getMainLooper());
	private final Runnable poll = this::checkScan;
	private LinearLayout box;
	private TextView status;

	@Override
	protected void onCreate(Bundle state) {
		super.onCreate(state);
		box = Ui.column(this);
		ImageView logo = new ImageView(this);
		logo.setImageResource(R.drawable.ic_launcher);
		logo.setContentDescription("mygram");
		int s = Ui.dp(this, 96);
		LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(s, s);
		lp.bottomMargin = Ui.dp(this, 24);
		box.addView(logo, lp);
		setContentView(box);
		if (Prefs.hasPin())
			askPin();
		else
			checkScan();
	}

	private void askPin() {
		EditText pin = Ui.field(this, "PIN", InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_PASSWORD);
		box.addView(pin);
		View ok = Ui.iconButton(this, R.drawable.ic_check, "Unlock", v -> {
			if (Prefs.checkPin(pin.getText().toString())) {
				box.removeViews(1, box.getChildCount() - 1);
				checkScan();
			} else {
				pin.setText("");
				Toast.makeText(this, "Wrong PIN", Toast.LENGTH_SHORT).show();
			}
		});
		box.addView(ok);
		// The keyboard's done key unlocks; the D-pad cannot leave the keyboard.
		pin.setOnEditorActionListener((v, action, event) -> ok.performClick());
		pin.requestFocus();
	}

	/** Waits while the library is being indexed; lets the user in once it is idle. */
	private void checkScan() {
		if (Prefs.server() == null) { // first run: setup comes next
			done();
			return;
		}
		Api.async(() -> Api.call("GET", "/scan-progress"), o -> {
			if (isDestroyed())
				return;
			if (!o.optBoolean("isScanning")) {
				done();
				return;
			}
			showScan(o);
			handler.postDelayed(poll, POLL_MS);
		}, e -> {
			if (isDestroyed())
				return;
			if (status == null)
				done(); // unreachable at the first check: Home reports it with Retry
			else
				handler.postDelayed(poll, POLL_MS); // mid-scan the server is slow; keep waiting
		});
	}

	private void showScan(JSONObject o) {
		if (status == null) {
			box.addView(new ProgressBar(this));
			box.addView(Ui.text(this, "Library is indexing", 24));
			status = Ui.text(this, "", 16);
			box.addView(status);
		}
		String msg = Post.str(o, "currentPhaseMessage");
		if (msg == null)
			msg = o.optString("phase");
		int done = o.optInt("processedDerivativeJobs"), total = o.optInt("queuedDerivativeJobs");
		status.setText(total > 0 ? msg + "  " + done + " / " + total : msg);
	}

	private void done() {
		App.locked = false;
		finish();
	}

	/** Back leaves the app instead of revealing the screen underneath. */
	@Override
	@SuppressWarnings("deprecation") // no predictive back on this TV; onBackPressed still fires
	public void onBackPressed() {
		finishAffinity();
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		handler.removeCallbacksAndMessages(null);
	}
}