package julianaavarc.lox.tool.java_gradle_kotlin;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
public class GenerateAst {
    static boolean hadError = false;
    public static void main(String[] args) throws IOException {
        if (args.length != 1) {
            System.err.println("Usage: generate_ast <output directory>");
            System.exit(64);
        }
        String outputDir = args[0];
        defineAst(outputDir, "Expr", Arrays.asList(
                "Binary   : Expr left, Token operator, Expr right",
                "Grouping : Expr expression",
                "Literal  : Object value",
                "Unary    : Token operator, Expr right"));
    }
    private static void defineAst(
            String outputDir, String baseName, List<String> types)
            throws IOException {
        String path = outputDir + "/" + baseName + ".java";
        PrintWriter writer = new PrintWriter(path, "UTF-8");
        writer.println("package com.craftinginterpreters.lox;");
        writer.println();
        writer.println("import java.util.List;");
        writer.println();
        writer.println("abstract class " + baseName + " {");
        // The AST classes.
        for (String type : types) {
            String className = type.split(":")[0].trim();
            String fields = type.split(":")[1].trim();
            defineType(writer, baseName, className, fields);
        }
        writer.println("}");
        writer.close();
    }
    private static void defineType(
            PrintWriter writer, String baseName,
            String className, String fieldList) {
        writer.println("  static class " + className + " extends " +
                baseName + " {");
        // Constructor.
        writer.println("    " + className + "(" + fieldList + ") {");
        // Store parameters in fields.
        String[] fields = fieldList.split(", ");
        for (String field : fields) {
            String name = field.split(" ")[1];
            writer.println("      this." + name + " = " + name + ";");
        }
        writer.println("    }");
        // Fields.
        writer.println();
        for (String field : fields) {
            writer.println("    final " + field + ";");
        }
        writer.println("  }");
    }
}

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This generated file contains a sample Java application project to get you started.
 * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.12/userguide/building_java_projects.html in the Gradle documentation.
 */
plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    application
}
repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
}
dependencies {
    // Use JUnit test framework.
    testImplementation(libs.junit)
    // This dependency is used by the application.
    implementation(libs.guava)
}
// Apply a specific Java toolchain to ease working on different environments.
java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(21)
    }
}
application {
    // Define the main class for the application.
    mainClass = "julianaavarc.lox.cli.java_gradle_kotlin.Lox"
}

include("cli")

include("cli", "tool")