package com.amaze.filemanager.services.asynctasks;

import android.database.Cursor;
import android.os.AsyncTask;
import android.view.View;
import android.webkit.WebView;

import com.amaze.filemanager.fragments.DbViewerFragment;
import com.amaze.filemanager.utils.theme.AppTheme;

import java.util.ArrayList;

/**
 * Created by Vishal on 20-03-2015.
 */
public class DbViewerTask extends AsyncTask<Void, Integer, Void> {

    Cursor schemaCursor, contentCursor;
    ArrayList<String> schemaList;
    ArrayList<String[]> contentList;
    DbViewerFragment dbViewerFragment;
    StringBuilder stringBuilder;
    WebView webView;
    String htmlInit;

    public DbViewerTask (Cursor schemaCursor, Cursor contentCursor, WebView webView, DbViewerFragment dbViewerFragment) {
        this.schemaCursor = schemaCursor;
        this.contentCursor = contentCursor;
        this.webView = webView;
        this.dbViewerFragment = dbViewerFragment;
        stringBuilder = new StringBuilder();
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        if (dbViewerFragment.dbViewer.getAppTheme().equals(AppTheme.DARK)) {

            htmlInit = "<html><body>" +
                    "<table border='1' style='width:100%;color:#ffffff'>";
        } else {

            htmlInit = "<html><body>" +
                    "<table border='1' style='width:100%;color:#000000'>";
        }
        stringBuilder.append(htmlInit);
        dbViewerFragment.loadingText.setVisibility(View.VISIBLE);
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);

        dbViewerFragment.loadingText.setText(values[0] + " records loaded");
    }

    @Override
    protected Void doInBackground(Void... params) {
        schemaList = getDbTableSchema(schemaCursor);
        contentList = getDbTableDetails(contentCursor);
        return null;
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
        dbViewerFragment.getActivity().onBackPressed();
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);

        dbViewerFragment.loadingText.setVisibility(View.GONE);

        // init schema row
        stringBuilder.append("<tr>");
        for (String s : schemaList) {
            stringBuilder.append("<th>").append(s).append("</th>");
        }
        stringBuilder.append("</tr>");

        for (String[] strings : contentList) {
            // init content row
            stringBuilder.append("<tr>");
            for (int i = 0; i<strings.length; i++) {
                stringBuilder.append("<td>").append(strings[i]).append("</td>");
            }
            stringBuilder.append("</tr>");
        }
        stringBuilder.append("</table></body></html>");
        webView.loadData(stringBuilder.toString(), "text/html", null);
        webView.setVisibility(View.VISIBLE);
    }

    private ArrayList<String[]> getDbTableDetails(Cursor c) {
        ArrayList<String[]> result = new ArrayList<>();
        int j = 0;
        for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
            if (!isCancelled()) {
                j++;
                publishProgress(j);
                String[] temp = new String[c.getColumnCount()];
                for (int i = 0; i < temp.length; i++) {
                    int dataType = c.getType(i);
                    switch (dataType) {
                        case 0:
                            // #FIELD_TYPE_NULL
                            temp[i] = null;
                            break;
                        case 1:
                            // #FIELD_TYPE_INTEGER
                            temp[i] = String.valueOf(c.getInt(i));
                            break;
                        case 2:
                            // #FIELD_TYPE_FLOAT
                            temp[i] = String.valueOf(c.getFloat(i));
                            break;
                        case 3:
                            // #FIELD_TYPE_STRING
                            temp[i] = c.getString(i);
                            break;
                        case 4:
                            // #FIELD_TYPE_BLOB
                            /*byte[] blob = c.getBlob(i);
                            blobString = new String(blob);*/
                            temp[i] = "(BLOB)";
                            break;
                    }
                }
                result.add(temp);
            } else {
                break;
            }
        }
        return result;
    }
    private ArrayList<String> getDbTableSchema(Cursor c) {
        ArrayList<String> result = new ArrayList<>();
        for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
            if (!isCancelled()) {

                result.add(c.getString(1));
            } else
                break;
        }
        return result;
    }
}