package Compiler;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.Scanner;

//Base class for the interpreter
public class Language {
    static boolean hadError = false;
    public static void main(String[] args){
        //Allow users to input a single line of code
        //Still needs some work to re-ask for input after each line
        if (args.length < 1){
            Scanner input = new Scanner(System.in);
            String sourceCode = "1";
            while (sourceCode!=""){
                System.out.print("Code: ");
                sourceCode = input.nextLine();
                runInterpreter(sourceCode, "out");
                hadError=false;
            }
            input.close();

        //Allow users to provide a path to a file as an argument
        } else if (args.length==1){
            try {
                String sourcecode = Files.readString(Paths.get(args[0]));  //Maybe should set charset here
                runInterpreter(sourcecode, args[0].split("\\.(?=[^\\.]+$)")[0]);
            } catch (IOException exception){
                System.out.println("File not found");
            }

        } else {
            System.out.println("Error, argument should be file path");
            System.exit(64);
        }
    }

    //Function to take source code and output the result
    private static void runInterpreter(String sourceCode, String outName){
        //Extract tokens from the source code
        TokenScanner scanner = new TokenScanner();
        List<Token> tokens = scanner.extractTokens(sourceCode);
        //for (Token token : tokens) {
        //    System.out.println(token);
        //}
        if (hadError) return;

        //Parse into AST
        Parser parser = new Parser(tokens);
        List<Statement> ast = parser.parse();
        if (hadError) return;

        //Translate AST into equivalent C code
        Translator translator = new Translator();
        List<String> code = translator.compileToC(ast);
        if (hadError) return;

        //Execute created C code
        ExecuteC cExecutor = new ExecuteC();
        cExecutor.compileAndExecuteC(code, outName);
    }

    //Basic error reporting
    static void displayError(int line,String message){
        hadError=true;
        System.out.println("An error was encountered on line: "+line);
        System.out.println(message);
    }
    //Basic error reporting
    static void displayError(Token token,String message){
        hadError=true;
        System.out.println("An error was encountered on line: "+token.line);
        System.out.println("ERROR: "+token.text);
        System.out.println(message);
    }
}