package com.stephanie.instagramclone.Login;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.stephanie.instagramclone.R;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    private static final String TAG = "LoginActivity";

    private FirebaseAuth mAuth;

    private Context mContext;
    private ProgressBar mProgressBar;
    private EditText mEmail, mPassword;
    private TextView mPleaseWait;


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

        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
        mPleaseWait = (TextView) findViewById(R.id.pleaseWait);
        mEmail = (EditText) findViewById(R.id.input_email);
        mPassword = (EditText) findViewById(R.id.input_password);
        mContext = LoginActivity.this;

        Log.d(TAG, "onCreate: started");

        mPleaseWait.setVisibility(View.GONE);
        mProgressBar.setVisibility(View.GONE);

        //Firebase Auth
        findViewById(R.id.btn_login).setOnClickListener(this);
        findViewById(R.id.link_signup).setOnClickListener(this);

        mAuth = FirebaseAuth.getInstance();

    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }

    @Override
    public void onClick(View view) {
        int i = view.getId();

        if (i == R.id.link_signup) {
            createAccount(mEmail.getText().toString(), mPassword.getText().toString());

        } else if (i == R.id.btn_login) {
            signIn(mEmail.getText().toString(), mPassword.getText().toString());
        }
    }

    private void updateUI(FirebaseUser user) {
        if (user != null) {
            //authenticated user
        } else {
            //returns to login
            startActivity(new Intent(this, LoginActivity.class));
        }
    }

    private void createAccount(String email, String password) {
        Log.e(TAG, "createAccount:" + email);
        if (!validateForm(email, password)) {
            return;
        } else {
            mProgressBar.setVisibility(View.VISIBLE);
            mPleaseWait.setVisibility(View.VISIBLE);
        }


        mAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.e(TAG, "createAccount: Success!");

                            // update UI with the signed-in user's information
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI(user);
                        } else {
                            Log.e(TAG, "createAccount: Fail!", task.getException());
                            Toast.makeText(getApplicationContext(), "Authentication failed!", Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }
                    }
                });
    }

    private void signIn(String email, String password) {
        Log.e(TAG, "signIn:" + email);
        if (!validateForm(email, password)) {
            return;
        } else {
            mProgressBar.setVisibility(View.VISIBLE);
            mPleaseWait.setVisibility(View.VISIBLE);
        }

        mAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.e(TAG, "signIn: Success!");

                            // update UI with the signed-in user's information
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI(user);
                        } else {
                            Log.e(TAG, "signIn: Fail!", task.getException());
                            Toast.makeText(getApplicationContext(), "Authentication failed!", Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }

                        if (!task.isSuccessful()) {
                            mPleaseWait.setText("Authentication failed!");
                        }
                    }
                });
    }

    private boolean validateForm(String email, String password) {

        if (TextUtils.isEmpty(email)) {
            Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
            return false;
        }

        if (TextUtils.isEmpty(password)) {
            Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
            return false;
        }

        if (password.length() < 6) {
            Toast.makeText(getApplicationContext(), "Password too short, enter minimum 6 characters!", Toast.LENGTH_SHORT).show();
            return false;
        }

        return true;
    }


}