package app.fedilab.android.sqlite;
/* Copyright 2018 Thomas Schneider
 *
 * This file is a part of Fedilab
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Fedilab; if not,
 * see <http://www.gnu.org/licenses>. */

import android.content.ContentValues;
import android.content.Context;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import app.fedilab.android.client.Entities.RemoteInstance;
import app.fedilab.android.helper.Helper;


/**
 * Created by Thomas on 20/08/2018.
 * Manage instance names in DB
 */
public class InstancesDAO {

    public Context context;
    private SQLiteDatabase db;

    public InstancesDAO(Context context, SQLiteDatabase db) {
        //Creation of the DB with tables
        this.context = context;
        this.db = db;
        SharedPreferences sharedpreferences = context.getSharedPreferences(Helper.APP_PREFS, Context.MODE_PRIVATE);

    }


    //------- INSERTIONS  -------

    /**
     * Insert an instance name in database
     *
     * @param instanceName String
     */
    public void insertInstance(String instanceName, String id, String type) {
        ContentValues values = new ContentValues();
        values.put(Sqlite.COL_INSTANCE, instanceName.trim());
        values.put(Sqlite.COL_USER_ID, id);
        values.put(Sqlite.COL_INSTANCE_TYPE, type);
        values.put(Sqlite.COL_DATE_CREATION, Helper.dateToString(new Date()));
        //Inserts search
        try {
            db.insert(Sqlite.TABLE_INSTANCES, null, values);
        } catch (Exception ignored) {
        }
    }


    //------- UPDATES  -------

    /**
     * update instance in database
     *
     * @param remoteInstance RemoteInstance
     */
    public void updateInstance(RemoteInstance remoteInstance) {
        ContentValues values = new ContentValues();
        List<String> tags = remoteInstance.getTags();
        values.put(Sqlite.COL_FILTERED_WITH, remoteInstance.getFilteredWith());


        if (tags != null && tags.size() > 0) {
            values.put(Sqlite.COL_TAGS, Helper.arrayToStringStorage(tags));
        }
        try {
            db.update(Sqlite.TABLE_INSTANCES, values, Sqlite.COL_INSTANCE + " =  ? ", new String[]{String.valueOf(remoteInstance.getHost())});
        } catch (Exception ignored) {
            ignored.printStackTrace();
        }
    }


    public void insertInstance(String instanceName, String type) {
        insertInstance(instanceName, "null", type);
    }

    //------- REMOVE  -------

    /***
     * Remove instance by its name
     * @return int
     */
    public int remove(String host) {
        return db.delete(Sqlite.TABLE_INSTANCES, Sqlite.COL_INSTANCE + " = \"" + host + "\"", null);
    }

    //------- REMOVE  -------

    /***
     * Remove instance by its name
     * @return int
     */
    public void cleanDoublon() {
        db.delete(Sqlite.TABLE_INSTANCES, Sqlite.COL_ID + " NOT IN (" +
                "  SELECT MIN(" + Sqlite.COL_ID + ")" +
                "  FROM " + Sqlite.TABLE_INSTANCES +
                "  GROUP BY " + Sqlite.COL_INSTANCE + "," + Sqlite.COL_USER_ID + ")", null);
    }

    //------- GETTERS  -------

    /**
     * Returns all instances in db for a user
     *
     * @return instances List<RemoteInstance>
     */
    public List<RemoteInstance> getAllInstances() {
        try {
            Cursor c = db.query(Sqlite.TABLE_INSTANCES, null, null, null, null, null, Sqlite.COL_INSTANCE + " ASC", null);
            return cursorToListSearch(c);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * Returns instance by its nale in db
     *
     * @return instance List<RemoteInstance>
     */
    public List<RemoteInstance> getInstanceByName(String keyword) {
        try {
            Cursor c = db.query(Sqlite.TABLE_INSTANCES, null, Sqlite.COL_INSTANCE + " = \"" + keyword + "\"", null, null, null, null, null);
            return cursorToListSearch(c);
        } catch (Exception e) {
            return null;
        }
    }


    /***
     * Method to hydrate stored instances from database
     * @param c Cursor
     * @return List<RemoteInstance>
     */
    private List<RemoteInstance> cursorToListSearch(Cursor c) {
        //No element found
        if (c.getCount() == 0) {
            c.close();
            return null;
        }
        List<RemoteInstance> remoteInstances = new ArrayList<>();
        while (c.moveToNext()) {
            RemoteInstance remoteInstance = new RemoteInstance();
            remoteInstance.setDbID(c.getString(c.getColumnIndex(Sqlite.COL_ID)));
            remoteInstance.setId(c.getString(c.getColumnIndex(Sqlite.COL_USER_ID)));
            try {
                remoteInstance.setTags(Helper.restoreArrayFromString(c.getString(c.getColumnIndex(Sqlite.COL_TAGS))));
            } catch (Exception ignored) {
            }
            remoteInstance.setHost(c.getString(c.getColumnIndex(Sqlite.COL_INSTANCE)));
            remoteInstance.setFilteredWith(c.getString(c.getColumnIndex(Sqlite.COL_FILTERED_WITH)));
            remoteInstance.setType(c.getString(c.getColumnIndex(Sqlite.COL_INSTANCE_TYPE)) == null ? "MASTODON" : c.getString(c.getColumnIndex(Sqlite.COL_INSTANCE_TYPE)));
            remoteInstances.add(remoteInstance);
        }
        //Close the cursor
        c.close();
        return remoteInstances;
    }
}