package com.example.webanton;

import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.view.View.OnClickListener;
import android.widget.Toast;

import java.util.List;

public class MainActivity extends AppCompatActivity
{
    private WebView myWebView;
    private EditText webAddress;
    private ProgressBar progBar;
    private SQLiteDatabase DB;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myWebView = findViewById(R.id.activity_main_webView);
        webAddress = findViewById(R.id.et_address);
        ImageButton back = findViewById(R.id.btn_Back);
        ImageButton forward = findViewById(R.id.btn_Forward);
        ImageButton refresh = findViewById(R.id.btn_Refresh);
        final ImageButton addBookmark = findViewById(R.id.btn_addBookmark);
        Button showBookmarks = findViewById(R.id.btn_showBookmark);
        progBar = findViewById(R.id.progBar);

        //Creates the database and the table if it doesn't already exist.
        DB = openOrCreateDatabase("WebAnton_Bookmarks.db", MODE_PRIVATE, null);
        DB.execSQL("create table if not exists bookmark(url nvarchar);");
        DB.close();

        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        myWebView.loadUrl("https://www.tec.dk");
        myWebView.setWebChromeClient(new WebChromeClient()
        {
            public void onProgressChanged(WebView view, int progress)
            {
                progBar.setProgress(progress);
            }
        });
        myWebView.setWebViewClient(new WebViewClient()
        {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon)
            {
                super.onPageStarted(view, url, favicon);
                //Checks if the current url exists in the bookmark table and changes the bookmark icon accordingly.
                SQLHandler handler = new SQLHandler(MainActivity.this);
                List result = handler.getData("select * from bookmark where url = '"+myWebView.getUrl()+"';");
                if(result.size() == 0)
                    addBookmark.setImageResource(android.R.drawable.btn_star_big_off);
                else
                    addBookmark.setImageResource(android.R.drawable.btn_star_big_on);
                progBar.setVisibility(View.VISIBLE);
            }
            @Override
            public void onPageFinished(WebView view, String url)
            {
                progBar.setVisibility(View.INVISIBLE);
            }
        });
        webAddress.setOnEditorActionListener(new TextView.OnEditorActionListener()
        {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
            {
                if(actionId == EditorInfo.IME_ACTION_GO)
                {
                    String url = webAddress.getText().toString();
                    if(!url.isEmpty())
                    {
                        if(!url.startsWith("http"))
                        {
                            if(!url.startsWith("www."))
                                url = "https://www." + url;
                            else
                                url = "https://" + url;
                        }
                        myWebView.loadUrl(url);
                    }
                    return true;
                }
                return false;
            }
        });
        //Pressing back button calls the clickBack method.
        back.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                clickBack();
            }
        });
        //Pressing forward button calls the clickForward method.
        forward.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                clickForward();
            }
        });
        //Pressing refresh button reloads the webview with the current url.
        refresh.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                String currentUrl = myWebView.getUrl();
                myWebView.loadUrl(currentUrl);
            }
        });
        //Pressing add bookmark button first checks if the current url already exists in the database.
        //If not, the addBookmark method is called. If yes, the deleteBookmark method is called.
        //The bookmark icon also changes accordingly.
        addBookmark.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                SQLHandler handler = new SQLHandler(MainActivity.this);
                List result = handler.getData("select * from bookmark where url = '"+myWebView.getUrl()+"';");
                if(result.size() == 0)
                {
                    addBookmark();
                    addBookmark.setImageResource(android.R.drawable.btn_star_big_on);
                }
                else
                {
                    deleteBookmark();
                    addBookmark.setImageResource(android.R.drawable.btn_star_big_off);
                }
            }
        });
        //Pressing show bookmarks button starts the bookmark activity.
        showBookmarks.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Intent bookmark = new Intent(v.getContext(), Bookmarks.class);
                startActivity(bookmark);
            }
        });
    }
    @Override
    public void onBackPressed()
    {
        if(myWebView.canGoBack())
            myWebView.goBack();
        else
            super.onBackPressed();
    }
    private void clickBack()
    {
        if(myWebView.canGoBack())
            myWebView.goBack();
    }
    private void clickForward()
    {
        if(myWebView.canGoForward())
            myWebView.goForward();
    }
    //Makes an instance of the SQLHandler class and calls its insertData method.
    private void addBookmark()
    {
        SQLHandler handler = new SQLHandler(MainActivity.this);
        handler.insertData(myWebView.getUrl());
        Toast.makeText(getApplicationContext(), "Bookmark added!", Toast.LENGTH_SHORT).show();
    }
    //Makes an instance of the SQLHandler class and calls its deleteData method.
    private void deleteBookmark()
    {
        SQLHandler handler = new SQLHandler(MainActivity.this);
        handler.deleteData("url = '"+myWebView.getUrl()+"'");
        Toast.makeText(getApplicationContext(), "Bookmark deleted!", Toast.LENGTH_SHORT).show();
    }
}