using UnityEngine;

using System;
using System.Collections;
using Mono.Data.Sqlite;


public class DbAccess

{

    private SqliteConnection dbConnection;

    private SqliteCommand dbCommand;

    private SqliteDataReader reader;


    public DbAccess (string connectionString)

    {
        OpenDB (connectionString);

    }
    public DbAccess ()
	{
		
	}

    public void OpenDB (string connectionString)

    {
		try
   		 {
        	dbConnection = new SqliteConnection (connectionString);
			
       	 	dbConnection.Open ();
			
       		Debug.Log ("Connected to db");
		 }
    	catch(Exception e)
    	{
       		string temp1 = e.ToString();
       		Debug.Log(temp1);
    	}

    }



    public void CloseSqlConnection ()

    {

        if (dbCommand != null) {

            dbCommand.Dispose ();

        }

        dbCommand = null;

        if (reader != null) {

            reader.Dispose ();

        }

        reader = null;

        if (dbConnection != null) {

            dbConnection.Close ();

        }

        dbConnection = null;

        Debug.Log ("Disconnected from db.");

    }


    private SqliteDataReader ExecuteQuery (string sqlQuery)

    {

        dbCommand = dbConnection.CreateCommand ();

        dbCommand.CommandText = sqlQuery;

        reader = dbCommand.ExecuteReader ();

        return reader;

    }


    public SqliteDataReader ReadFullTable (string tableName)

    {

        string query = "SELECT * FROM " + tableName;

        return ExecuteQuery (query);

    }

 

    public SqliteDataReader InsertInto (string tableName, string[] values)

    {

        string query = "INSERT INTO " + tableName + " VALUES (" + values[0];

        for (int i = 1; i < values.Length; ++i) {

            query += ", " + values[i];

        }

        query += ")";
        return ExecuteQuery (query);

    }

	
	public SqliteDataReader UpdateInto (string tableName, string []cols,string []colsvalues,string selectkey,string selectvalue)
	{
		
		
		string query = "UPDATE "+tableName+" SET "+cols[0]+" = "+colsvalues[0];
	
		for (int i = 1; i < colsvalues.Length; ++i) {
		
		 	 query += ", " +cols[i]+" ="+ colsvalues[i];
		}
		
		 query += " WHERE "+selectkey+" = "+selectvalue+" ";
	
		return ExecuteQuery (query);
	}
	
	
	public SqliteDataReader Delete(string tableName,string []cols,string []colsvalues)
	{
			string query = "DELETE FROM "+tableName + " WHERE " +cols[0] +" = " + colsvalues[0];
		
			for (int i = 1; i < colsvalues.Length; ++i) {
		
		 	    query += " or " +cols[i]+" = "+ colsvalues[i];
			}
		return ExecuteQuery (query);
	}
	
	
    public SqliteDataReader InsertIntoSpecific (string tableName, string[] cols, string[] values)

    {

        if (cols.Length != values.Length) {

            throw new SqliteException ("columns.Length != values.Length");

        }

        string query = "INSERT INTO " + tableName + "(" + cols[0];

        for (int i = 1; i < cols.Length; ++i) {

            query += ", " + cols[i];

        }

        query += ") VALUES (" + values[0];

        for (int i = 1; i < values.Length; ++i) {

            query += ", " + values[i];

        }

        query += ")";

        return ExecuteQuery (query);

    }



    public SqliteDataReader DeleteContents (string tableName)

    {

        string query = "DELETE FROM " + tableName;

        return ExecuteQuery (query);

    }


    public SqliteDataReader CreateTable (string name, string[] col, string[] colType)

    {
        if (col.Length != colType.Length) {
		
            throw new SqliteException ("columns.Length != colType.Length");
        }

        string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0];

        for (int i = 1; i < col.Length; ++i) {

            query += ", " + col[i] + " " + colType[i];

        }

        query += ")";
		
		
        return ExecuteQuery (query);

    }
	

    public SqliteDataReader SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values)

    {

        if (col.Length != operation.Length || operation.Length != values.Length) {

            throw new SqliteException ("col.Length != operation.Length != values.Length");

        }

        string query = "SELECT " + items[0];

        for (int i = 1; i < items.Length; ++i) {

            query += ", " + items[i];

        }

        query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' ";

        for (int i = 1; i < col.Length; ++i) {

            query += " AND " + col[i] + operation[i] + "'" + values[0] + "' ";

        }


        return ExecuteQuery (query);

    }

    

    

    

}