package com.appypie.testapp

import androidx.core.text.isDigitsOnly
import com.appypie.VARIABLE_TYPE
import java.util.*
import kotlin.collections.ArrayList

class FormulaUtil {
    var operatorArr = arrayOf("+" , "-" , "/" , "%" , "*")
    var functionArr = arrayOf("UPPER","LOWER","CONCATENATE","SQRT","AVERAGE",
        "DISTANCE","POWER","ABS","MAX","MIN","AVERAGE","COUNT","ROUND",
        "STDEVP","FLOOR","CEILING","NUMBER","DECIMAL","SUM")

    companion object{
        fun getStackTokenArr(str:String):ArrayList<String>{
            var stackArr:ArrayList<String> = arrayListOf<String>()
            var getVal:String= ""
            var breakExpressions ="(,)"
            str.forEachIndexed { index, charData ->
                if(charData != null && breakExpressions.contains(charData)){
                    stackArr.add(getVal)
                    stackArr.add(charData.toString())
                    getVal = ""
                }else{
                    getVal = "${getVal}${charData}"
                }
            }
            stackArr.add(getVal)
            return stackArr
        }

        fun calculateValueStack(expStr:String){
            var ops = Stack<String>()
            var vals = Stack<Double>()
            var stackTokenArr:ArrayList<String> = getStackTokenArr(expStr)
            stackTokenArr.forEachIndexed { index, stringData ->
                var data = checkVariableType(stringData)
                print()
            }
        }

        //Function To Get Type Of Variables in Operator Operand Stack
        fun checkVariableType(variable:String) : VARIABLE_TYPE {
            if(functionArr.any{ it == variable}){
                return VARIABLE_TYPE.FUNCTION
            }else if(operatorArr.any{ it == variable}){
                return VARIABLE_TYPE.OPERATOR
            }else if(variable.contains("[") && variable.contains("]")){
                return VARIABLE_TYPE.COLOUM_VALUE
            }else if(variable.equals("(")){
                return VARIABLE_TYPE.START_BRACKET
            }else if(variable.equals(")")){
                return VARIABLE_TYPE.POP_TO_EVALUATE
            }else if(variable.isDigitsOnly()){
                return VARIABLE_TYPE.CONSTANT
            }
            return VARIABLE_TYPE.IGNORE
        }
    }





}