package invalid.lena.scrcpy;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

// Pairing form + saved-device list.
//
// Layout: host, pair-port, pair-code, connect-port + a single "Pair and save"
// button. After a successful pair() against the daemon, the row is appended
// to devices.json with the *connect* port (different from the pair port on
// Android 11+). Tapping a saved row launches the Mirror activity with the
// target host/port; Mirror owns its own Adb instance loaded from the same
// on-disk keypair.
public final class Main extends Activity {

    private volatile Adb adb;
    private ArrayAdapter<Devices.Device> adapter;
    private Button pairButton;

    @Override
    protected void onCreate(Bundle saved) {
        super.onCreate(saved);
        setContentView(R.layout.main);

        EditText host        = findViewById(R.id.host);
        EditText pairPort    = findViewById(R.id.pair_port);
        EditText pairCode    = findViewById(R.id.pair_code);
        EditText connectPort = findViewById(R.id.connect_port);
        pairButton           = findViewById(R.id.pair);
        View settingsBtn     = findViewById(R.id.settings);
        ListView devices     = findViewById(R.id.devices);
        TextView devicesEmpty = findViewById(R.id.devices_empty);

        settingsBtn.setOnClickListener(v -> startActivity(
                new Intent(this, SettingsActivity.class)));

        adapter = new ArrayAdapter<>(this, R.layout.device_row, R.id.device_label, Devices.load(this));
        devices.setAdapter(adapter);
        devices.setEmptyView(devicesEmpty);

        // RSA keygen on first launch can take 1-3 s; never on the UI thread.
        pairButton.setEnabled(false);
        new Thread(() -> {
            try {
                Adb a = Adb.getInstance(this);
                runOnUiThread(() -> {
                    adb = a;
                    pairButton.setEnabled(true);
                });
            } catch (Exception e) {
                Log.e(e, "adb init failed");
                runOnUiThread(() -> {
                    Toast.makeText(this, "adb init failed: " + e.getMessage(),
                            Toast.LENGTH_LONG).show();
                    finish();
                });
            }
        }, "adb-init").start();

        devices.setOnItemClickListener((parent, view, pos, id) -> {
            Devices.Device d = adapter.getItem(pos);
            Log.i("connect tap: %s", d);
            Intent i = new Intent(this, Mirror.class);
            i.putExtra(Mirror.EXTRA_HOST, d.host);
            i.putExtra(Mirror.EXTRA_PORT, d.port);
            startActivity(i);
        });

        devices.setOnItemLongClickListener((parent, view, pos, id) -> {
            Devices.Device d = adapter.getItem(pos);
            new AlertDialog.Builder(this)
                    .setTitle(R.string.forget_device)
                    .setMessage(d.host + ":" + d.port)
                     .setPositiveButton(android.R.string.ok, (dlg, w) -> {
                         Log.i("forget device: %s", d);
                        try {
                            List<Devices.Device> updated = Devices.remove(this, d);
                            adapter.clear();
                            adapter.addAll(updated);
                            adapter.notifyDataSetChanged();
                        } catch (Exception e) {
                            Log.e(e, "forget device: save failed");
                            Toast.makeText(this, "could not save device list",
                                    Toast.LENGTH_LONG).show();
                        }
                    })
                    .setNegativeButton(android.R.string.cancel, null)
                    .show();
            return true;
        });

        pairButton.setOnClickListener(v -> {
            if (adb == null) return; // still initialising
            String h  = host.getText().toString().trim();
            String pp = pairPort.getText().toString().trim();
            String pc = pairCode.getText().toString().trim();
            String cp = connectPort.getText().toString().trim();
            if (TextUtils.isEmpty(h) || TextUtils.isEmpty(pp)
                    || TextUtils.isEmpty(pc) || TextUtils.isEmpty(cp)) {
                Toast.makeText(this, "fill all four fields", Toast.LENGTH_SHORT).show();
                return;
            }
            int pairP, connP;
            try {
                pairP = Integer.parseInt(pp);
                connP = Integer.parseInt(cp);
            } catch (NumberFormatException e) {
                Toast.makeText(this, "ports must be numeric", Toast.LENGTH_SHORT).show();
                return;
            }
            if (pairP < 1 || pairP > 65535 || connP < 1 || connP > 65535) {
                Toast.makeText(this, "ports must be 1-65535", Toast.LENGTH_SHORT).show();
                return;
            }
            pairButton.setEnabled(false);
            Toast.makeText(this, R.string.pairing, Toast.LENGTH_SHORT).show();
            new Thread(() -> pairAndSave(h, pairP, pc, connP, pairButton), "pair").start();
        });
    }

    private void pairAndSave(String host, int pairPort, String code, int connPort, Button btn) {
        try {
            Log.i("pair: %s:%d", host, pairPort);
            boolean ok = adb.pair(host, pairPort, code);
            if (!ok) throw new IllegalStateException("pair returned false");
            Log.i("pair ok host=%s pair_port=%d", host, pairPort);
            Devices.Device d = new Devices.Device(host, connPort);
            List<Devices.Device> updated = Devices.upsert(this, d);
            runOnUiThread(() -> {
                adapter.clear();
                adapter.addAll(updated);
                adapter.notifyDataSetChanged();
                Toast.makeText(this, "paired and saved", Toast.LENGTH_SHORT).show();
                btn.setEnabled(true);
            });
        } catch (Exception e) {
            Log.e(e, "pair failed");
            runOnUiThread(() -> {
                Toast.makeText(this, "pair failed: " + e.getMessage(), Toast.LENGTH_LONG).show();
                btn.setEnabled(true);
            });
        }
    }
}
