package co.za.langalibalele.fuelmanagement;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.android.material.button.MaterialButton;
import com.google.android.material.textfield.TextInputEditText;
import com.google.gson.Gson;

import java.io.IOException;

import co.za.langalibalele.fuelmanagement.models.ApiResponse;
import co.za.langalibalele.fuelmanagement.utils.ApiClient;
import co.za.langalibalele.fuelmanagement.utils.SessionManager;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class LoginActivity extends AppCompatActivity {

    private TextInputEditText usernameInput, passwordInput;
    private MaterialButton loginButton;
    private View progressBar, errorText;
    private SessionManager sessionManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        sessionManager = new SessionManager(this);

        // Check if already logged in
        if (sessionManager.isLoggedIn()) {
            navigateToMain();
            return;
        }

        initViews();
        setupListeners();
    }

    private void initViews() {
        usernameInput = findViewById(R.id.usernameInput);
        passwordInput = findViewById(R.id.passwordInput);
        loginButton = findViewById(R.id.loginButton);
        progressBar = findViewById(R.id.progressBar);
        errorText = findViewById(R.id.errorText);
    }

    private void setupListeners() {
        loginButton.setOnClickListener(v -> attemptLogin());
    }

    private void attemptLogin() {
        String username = usernameInput.getText().toString().trim();
        String password = passwordInput.getText().toString().trim();

        if (username.isEmpty() || password.isEmpty()) {
            showError("Please enter username and password");
            return;
        }

        performLogin(username, password);
    }

    private void performLogin(String username, String password) {
        setLoading(true);

        OkHttpClient client = ApiClient.getClient();
        RequestBody formBody = new FormBody.Builder()
                .add("username", username)
                .add("password", password)
                .build();

        Request request = new Request.Builder()
                .url(ApiClient.getBaseUrl() + "login.php")
                .post(formBody)
                .build();

        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                runOnUiThread(() -> {
                    setLoading(false);
                    showError("Connection failed: " + e.getMessage());
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String responseBody = response.body().string();
                
                runOnUiThread(() -> {
                    setLoading(false);
                    try {
                        Gson gson = new Gson();
                        ApiResponse apiResponse = gson.fromJson(responseBody, ApiResponse.class);

                        if (apiResponse.isSuccess()) {
                            // Save session
                            sessionManager.createLoginSession(0, username);
                            Toast.makeText(LoginActivity.this, "Login successful!", Toast.LENGTH_SHORT).show();
                            navigateToMain();
                        } else {
                            showError(apiResponse.getMessage());
                        }
                    } catch (Exception e) {
                        showError("Invalid response from server");
                    }
                });
            }
        });
    }

    private void setLoading(boolean loading) {
        progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
        loginButton.setEnabled(!loading);
        usernameInput.setEnabled(!loading);
        passwordInput.setEnabled(!loading);
    }

    private void showError(String message) {
        errorText.setVisibility(View.VISIBLE);
        ((android.widget.TextView) errorText).setText(message);
    }

    private void navigateToMain() {
        Intent intent = new Intent(LoginActivity.this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}