import type { Page } from "@playwright/test";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

export const romPath = resolve(
  process.env.CRYSTAL_ROM_PATH ??
    "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc",
);
export const symbolsPath = ".reference/pokecrystal/pokecrystal11.sym";

/** Banked addresses from the private PRET rebuild's symbol file. */
export function loadSymbols() {
  const symbols = new Map(
    readFileSync(symbolsPath, "utf8")
      .split("\n")
      .flatMap((line) => {
        const match = /^([0-9a-f]{2}):([0-9a-f]{4}) (\S+)$/.exec(line);
        return match
          ? [
              [
                match[3],
                {
                  bank: parseInt(match[1], 16),
                  address: parseInt(match[2], 16),
                },
              ] as const,
            ]
          : [];
      }),
  );
  return {
    at: (name: string) => symbols.get(name)!.address,
    routine: (name: string) => symbols.get(name)!,
  };
}

/** Open the reference page and hand it the ROM through an isolated file
 * input, without an HTTP ROM endpoint. */
export async function openReference(page: Page) {
  await page.goto("/reference.html");
  await page.evaluate(() => {
    const input = document.createElement("input");
    input.type = "file";
    input.id = "reference-fixture";
    document.body.append(input);
  });
  await page.locator("#reference-fixture").setInputFiles(romPath);
}