package com.custofeed.app.feedback.activity;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.custofeed.app.feedback.R;
import com.custofeed.app.feedback.model.DatabaseHandler;
import com.custofeed.app.feedback.network.URLS;
import com.custofeed.app.feedback.utils.SharedPreference;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

/**
 * A login screen that offers login via username/password.
 */
public class LoginActivity extends AppCompatActivity{

    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private UserLoginTask mAuthTask = null;

    // UI references.
    private AutoCompleteTextView mUsernameView;
    private EditText mPasswordView;
    private View mProgressView;
    private View mLoginFormView;

    private Boolean loginResult = false;
    private SharedPreferences sharedPref;

    DatabaseHandler mydb;

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

        mydb = new DatabaseHandler(this);

        sharedPref = getSharedPreferences("data", MODE_PRIVATE);

        //Check if user is already logged in
        Boolean isLogged = sharedPref.getBoolean(SharedPreference.Account.IS_LOGGED, false);
        if(isLogged) {
            //Check if Login Expired
            long expires = sharedPref.getLong(SharedPreference.Account.SESSION_EXPIRE, 0);
            if(System.currentTimeMillis() < expires){
                nextActivity(true);
            }
        }

        // Set up the login form.
        mUsernameView = (AutoCompleteTextView) findViewById(R.id.username);
        mPasswordView = (EditText) findViewById(R.id.password);
        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                ConnectivityManager connMgr = (ConnectivityManager)
                        getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
                if (networkInfo != null && networkInfo.isConnected()) {
                    if (id == R.id.login || id == EditorInfo.IME_NULL) {
                        attemptLogin();
                        return true;
                    }
                } else {
                    Toast.makeText(LoginActivity.this,
                            "No network connection available", Toast.LENGTH_SHORT).show();
                }
                return false;
            }
        });

        //Autofill form if Details Exist
        String remUsername = sharedPref.getString(SharedPreference.Account.USERNAME, null);
        String remPassword = sharedPref.getString(SharedPreference.Account.PASSWORD, null);
        if(remUsername != null && remPassword != null){
            mUsernameView.setText(remUsername);
            mPasswordView.setText(remPassword);
        }

        Button mSignInButton = (Button) findViewById(R.id.sign_in_button);
        mSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                ConnectivityManager connMgr = (ConnectivityManager)
                        getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
                if (networkInfo != null && networkInfo.isConnected()) {
                    attemptLogin();
                } else {
                    Toast.makeText(LoginActivity.this,
                            "No network connection available", Toast.LENGTH_SHORT).show();
                }
            }
        });

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);

    }

    protected void setReturn(Boolean result){
        loginResult = result;
    }

    private void loginUser(){
        final String username = mUsernameView.getText().toString().trim();
        final String password = mPasswordView.getText().toString().trim();

        StringRequest stringRequest = new StringRequest(Request.Method.POST, URLS.POST_LOGIN,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            if(jsonObject.has("key")){
                                SharedPreferences.Editor prefEditor = sharedPref.edit();
                                prefEditor.putString(SharedPreference.Account.AUTH_TOKEN, jsonObject.optString("key"));
                                prefEditor.apply();
                                Toast.makeText(LoginActivity.this,
                                        "Logging In",Toast.LENGTH_SHORT).show();
                                nextActivity(false);
                                setReturn(true);
                            }else{
                                Toast.makeText(LoginActivity.this,
                                        "Invalid Credentials",Toast.LENGTH_SHORT).show();
                                setReturn(false);
                            }
                        } catch (JSONException e) {
                            Toast.makeText(LoginActivity.this,
                                    "Invalid Credentials",Toast.LENGTH_SHORT).show();
                            setReturn(false);
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(LoginActivity.this,
                                "Invalid Credentials",Toast.LENGTH_SHORT).show();
                        setReturn(false);
                    }
                }){
            @Override
            protected Map<String,String> getParams(){
                Map<String,String> params = new HashMap<>();
                params.put(SharedPreference.Account.USERNAME, username);
                params.put(SharedPreference.Account.PASSWORD,password);
                return params;
            }

        };

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }


    /**
     * Attempts to sign in or register the account specified by the login form.
     * If there are form errors (invalid username, missing fields, etc.), the
     * errors are presented and no actual login attempt is made.
     */
    private void attemptLogin() {
        if (mAuthTask != null) {
            return;
        }

        // Reset errors.
        mUsernameView.setError(null);
        mPasswordView.setError(null);

        // Store values at the time of the login attempt.
        String username = mUsernameView.getText().toString();
        String password = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;

        // Check for a valid password, if the user entered one.
        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }

        // Check for a valid username address.
        if (TextUtils.isEmpty(username)) {
            mUsernameView.setError(getString(R.string.error_field_required));
            focusView = mUsernameView;
            cancel = true;
        }

        // Check for a valid password, if the user entered one.
        if (!isUsernameValid(username)) {
            mPasswordView.setError(getString(R.string.error_invalid_username));
            focusView = mPasswordView;
            cancel = true;
        }

        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            showProgress(true);
            mAuthTask = new UserLoginTask();
            mAuthTask.execute((Void) null);
        }
    }

    private boolean isUsernameValid(String username) {
        return username.length() > 0;
    }

    private boolean isPasswordValid(String password) {
        return password.length() > 4;
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
        // for very easy animations. If available, use these APIs to fade-in
        // the progress spinner.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);

            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(
                    show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });

            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

        UserLoginTask() {}



        @Override
        protected Boolean doInBackground(Void... params) {
            try {
                loginUser();
                if(!loginResult){
                    Toast.makeText(LoginActivity.this,
                            "Invalid Login Credentials",Toast.LENGTH_LONG).show();
                }
                return loginResult;

            } catch(Exception e) {
                return false;
            }
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(true);
        }

        @Override
        protected void onCancelled() {
            mAuthTask = null;
            showProgress(false);
        }
    }

    protected void nextActivity(Boolean isLogged){
        if(!isLogged){
            //Set User Logged in state
            SharedPreferences.Editor prefEditor = sharedPref.edit();
            prefEditor.putLong(SharedPreference.Account.SESSION_EXPIRE, System.currentTimeMillis() + URLS.SESSION_EXPIRE_TIME);
            prefEditor.putBoolean(SharedPreference.Account.IS_LOGGED,true);

            CheckBox rememberMe = (CheckBox) findViewById(R.id.rememberCheckBox);
            if(rememberMe.isChecked()){
                prefEditor.putString(SharedPreference.Account.USERNAME, mUsernameView.getText().toString().trim());
                prefEditor.putString(SharedPreference.Account.PASSWORD, mPasswordView.getText().toString().trim());
            }else{
                prefEditor.putString(SharedPreference.Account.USERNAME,null);
                prefEditor.putString(SharedPreference.Account.PASSWORD, null);
            }
            prefEditor.apply();
        }

        nextActivity();
    }

    protected void nextActivity(){
        finish();
        Intent myIntent = new Intent(this,PinActivity.class);
        this.startActivity(myIntent);
    }
}