import { createHash } from "node:crypto";
import { readFileSync } from "node:fs";
import { execFileSync } from "node:child_process";

const root = ".reference/pokecrystal";
const expected = "f2f52230b536214ef7c9924f483392993e226cfb";
const romPath =
  process.env.CRYSTAL_ROM_PATH ??
  "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc";
const supplied = readFileSync(romPath),
  rebuilt = readFileSync(`${root}/pokecrystal11.gbc`);
if (
  createHash("sha1").update(supplied).digest("hex") !== expected ||
  !supplied.equals(rebuilt)
)
  throw new Error(
    "The supplied ROM and reference rebuild must exactly match revision 1.1.",
  );
const revision = execFileSync("git", ["-C", root, "rev-parse", "HEAD"], {
  encoding: "utf8",
}).trim();
if (revision !== "7a7881d0d62e0ddbd82dcf10e7116807487ac651")
  throw new Error("Unexpected PRET revision.");
const symbols = new Map(
  readFileSync(`${root}/pokecrystal11.sym`, "utf8")
    .split("\n")
    .flatMap((line) => {
      const match = /^([0-9a-f]{2}):([0-9a-f]{4}) (\S+)$/.exec(line);
      if (!match) return [];
      const bank = parseInt(match[1], 16),
        address = parseInt(match[2], 16);
      return [
        [
          match[3],
          address < 0x4000 ? address : bank * 0x4000 + address - 0x4000,
        ],
      ];
    }),
);
const names = {
  mapGroups: "MapGroupPointers",
  tilesets: "Tilesets",
  collisions: "CollisionPermissionTable",
  environmentColors: "EnvironmentColorsPointers",
  backgroundPalettes: "TilesetBGPalette",
  objectPalettes: "MapObjectPals",
  roofPalettes: "RoofPals",
  roofTypes: "MapGroupRoofs",
  roofs: "Roofs",
  housePalettes: "HousePalette",
  sprites: "OverworldSprites",
  facings: "Facings",
  standardScripts: "StdScripts",
};
const profile = readFileSync("src/game/rom/profile.ts", "utf8");
for (const [key, symbol] of Object.entries(names)) {
  const match = new RegExp(`${key}:\\s*(0x[0-9a-f]+)`, "i").exec(profile);
  if (!match || Number(match[1]) !== symbols.get(symbol))
    throw new Error(`Profile address mismatch: ${key} / ${symbol}`);
}
console.log(
  "User ROM, pinned PRET rebuild and all native profile addresses match.",
);