package com.example.aven.projekt2

import android.content.Context
import android.database.SQLException
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteException
import android.database.sqlite.SQLiteOpenHelper
import java.io.FileOutputStream
import java.io.IOException


/**
 * Created by Aven on 2018-05-14.
 */
class DatabaseManager: SQLiteOpenHelper {

    private val DB_PATH = "/data/data/com.example.aven.projekt2/databases/"

    private val DB_NAME = "BrickList.db"

    private var myDataBase: SQLiteDatabase? = null

    private val myContext: Context

    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    constructor(context: Context):super(context, "BrickList.db", null, 1){
        this.myContext = context
    }

    /**
     * Creates a empty database on the system and rewrites it with your own database.
     */
    @Throws(IOException::class)
    fun createDataBase() {

        val dbExist = checkDataBase()

        if (dbExist) {
            //do nothing - database already exist
        } else {

            //By calling this method and empty database will be created into the default system path
            //of your application so we are gonna be able to overwrite that database with our database.
            this.readableDatabase

            try {

                copyDataBase()

            } catch (e: IOException) {

                throw Error("Error copying database")

            }

        }

    }

    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private fun checkDataBase(): Boolean {

        var checkDB: SQLiteDatabase? = null

        try {
            val myPath = DB_PATH + DB_NAME
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY)

        } catch (e: SQLiteException) {

            //database does't exist yet.

        }

        if (checkDB != null) {

            checkDB.close()

        }

        return if (checkDB != null) true else false
    }

    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     */
    @Throws(IOException::class)
    private fun copyDataBase() {

        //Open your local db as the input stream
        val myInput = myContext.assets.open(DB_NAME)

        // Path to the just created empty db
        val outFileName = DB_PATH + DB_NAME

        //Open the empty db as the output stream
        val myOutput = FileOutputStream(outFileName)

        //transfer bytes from the inputfile to the outputfile
        val buffer = ByteArray(1024)
        var length = myInput.read(buffer)
        while (length > 0) {
            myOutput.write(buffer, 0, length)
            length = myInput.read(buffer)
        }

        //Close the streams
        myOutput.flush()
        myOutput.close()
        myInput.close()

    }

    @Throws(SQLException::class)
    fun openDataBase() {

        //Open the database
        val myPath = DB_PATH + DB_NAME
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE)

    }

    @Synchronized override fun close() {

        if (myDataBase != null)
            myDataBase!!.close()

        super.close()

    }

    override fun onCreate(db: SQLiteDatabase) {

    }

    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {

    }

    // Add your public helper methods to access and get content from the database.
    // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
    // to you to create adapters for your views.

    fun fetchName(code: String): String{
        val query = "SELECT NAME FROM Parts WHERE CODE LIKE \"$code\""
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var name: String = ""
        if(cursor.moveToFirst()){
            name = cursor.getString(0)
        }
        return name
    }

    fun fetchColorName(colorId: Int): String{
        val query = "SELECT NAME FROM Colors WHERE CODE=$colorId"
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var colorName: String = ""
        if(cursor.moveToFirst()){
            colorName = cursor.getString(0)
        }
        return colorName
    }

    fun fetchTypeName(code: String): String{
        val query = "SELECT NAME FROM ItemTypes WHERE CODE LIKE \"$code\""
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var typeName: String = ""
        if(cursor.moveToFirst()){
            typeName = cursor.getString(0)
        }
        return typeName
    }

    fun fetchProjects(): ArrayList<Project>{
        val query = "SELECT _id, Name, Active FROM Inventories"
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var tempList = ArrayList<Project>()
        if(cursor.moveToFirst()) {
            tempList.add(Project(cursor.getString(0), cursor.getInt(1), cursor.getInt(2)))
        }
        while(cursor.moveToNext()){
            tempList.add(Project(cursor.getString(0), cursor.getInt(1), cursor.getInt(2)))
        }
        return tempList
    }

    fun fetchCode(itemId: Int): String{
        val query = "SELECT Code FROM Codes WHERE CODE LIKE \"$itemId\""
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var code: String = ""
        if(cursor.moveToFirst()){
            code = cursor.getString(0)
        }
        return code
    }

    fun loadProjectData(id: Int):ArrayList<Block>{
        val query = "SELECT * FROM InventoriesParts WHERE InventoryID=$id"
        val db = this.readableDatabase
        val cursor = db.rawQuery(query, null)
        var tempList = ArrayList<Block>()
        if(cursor.moveToFirst()){
            var tCode = fetchCode(cursor.getInt(3))
            var tTypeCode = cursor.getString(2)
           // tempList.add(Block(fetchName(tCode),fetchTypeName(tTypeCode)))
        }


        return tempList
    }
}