/* 
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/ClientSide/javascript.js to edit this template
 */

/**
 * instrucoes iniciais para criacao da maquina de estado EVM
 * */


//instrucoes das operacoes a ser realizadas pelo smart contract
const STOP = "STOP";
const ADD = "ADD";
const PUSH = "PUSH";


class Interpreter {
    
    
    constructor() {
        this.state = {
            
            programCounter : 0,
            stack: [],
            code : []
            
        };
        
        
    }
    
    runCode(code) {
        const a = 0;
        const b = 0;
        const value = 0;
        const opcode = null;
        this.state.code = code;
        
        while(this.state.programCounter < this.state.code.length) {
            const opcode = this.state.code[this.state.programCounter];
            console.log("dbg-programCounter" + this.state.programCounter);
//            console.log("dbg-code" + this.state.programCounter);
            console.log("dbg-opcode" + opcode);
            
            try {
                switch (opcode) {
                    
                    case STOP:
                        console.log("dbg-case-stop");
                        throw new Error("execution complete");
                    
                    case PUSH:
                        console.log("dbg-case-push");
                        this.state.programCounter++;
                        value = this.state.code[this.state.programCounter];
                        this.state.stack.push(value);
                        break;
                    
                    case ADD:
                        console.log("dbg-case-add");
                        a = this.state.stack.pop();
                        b = this.state.stack.pop();
                        this.state.stack.push(a + b);
                        break;
                    
                    default:
                        console.log("dbg-case-default");
                        break;
                }
            } catch (error) {
                console.log("dbg-catch-err");
                return this.state.stack[this.state.stack.length - 1];
            }
            
            console.log("dbg-program-counter-++");
            this.state.programCounter++;
        }
    }
    
}


let code = [
    PUSH, 
    10,
    PUSH,
    5,
    ADD,
    STOP
],
   result = new Interpreter().runCode(code);

console.log("resultado da soma", result);