import * as ast from "./ast.ts";
import * as front from "./front/mod.ts";
import * as middle from "./middle.ts";
import { MirInterpreter } from "./mir_interpreter.ts";

const filename = Deno.args[0];
const text = await Deno.readTextFile(filename);

const fileAst = front.parse(filename, text);
const resols = front.resolve(filename, text, fileAst);
const checker = new front.Checker(filename, text, fileAst, resols);

let mainFn: ast.NodeWithKind<"FnStmt"> | null = null;

fileAst.visit({
    visit(node) {
        if (node.kind.tag === "FnStmt" && node.kind.ident === "main") {
            if (mainFn) {
                console.error("error: multiple 'main' functions");
                Deno.exit(1);
            }

            ast.assertNodeWithKind(node, "FnStmt");
            mainFn = node;
        }
    },
});

if (!mainFn) {
    console.error("error: no 'main' function");
    Deno.exit(1);
}

const m = new middle.MiddleLowerer(resols, checker);
const mainMiddleFn = m.lowerFn(mainFn);

if (!Deno.args.includes("--test")) {
    console.log(mainMiddleFn.pretty());
}

const interp = new MirInterpreter();
interp.eval(mainMiddleFn);