import { test, expect } from "@playwright/test";
import { existsSync } from "node:fs";
import { romPath, symbolsPath, loadSymbols, openReference, revisionRoms } from "./reference-fixture";

test.skip(!existsSync(romPath) || !existsSync(symbolsPath), "Needs private ROM/reference.");
// The English cartridges share 1.1's symbols; not run with another's.
test.skip(Boolean(process.env.CRYSTAL_SYMBOLS_PATH), "Compares the English cartridges.");

/** BattleTowerText on each English cartridge, with PrintTextboxTextAt
 * patched to keep the text pointer: for every BattleTowerTrainers entry,
 * several hRandomAdd values and each of the three texts, the pointer matches
 * battleTowerText's. Revision 1.0 indexes BTTrainerClassGenders with the
 * name's sixth character instead of the class. */
for (const [revision, rom] of [["1.1", romPath], ["1.0", revisionRoms["1.0"]], ["au", revisionRoms.au]] as const)
  test(`BattleTowerText matches the ${revision} cartridge`, async ({ page }) => {
    test.skip(!existsSync(rom), `Needs PRET's ${revision} rebuild.`);
    test.setTimeout(120_000);
    const { at, routine } = loadSymbols();
    const a = {
      romBank: at("hROMBank"),
      program: at("wOverworldMapBlocks"),
      stackTop: at("wStackTop"),
      randomAdd: at("hRandomAdd"),
      name: routine("wBT_OTName"),
      textIndex: routine("wBT_TrainerTextIndex"),
    };
    const routines = { text: routine("BattleTowerText"), print: routine("PrintTextboxTextAt") };
    await openReference(page, rom);
    const result = await page.evaluate(
      async ({ a, routines, revision }) => {
        const { BinjgbEmulator } = await import("/src/emulator/binjgb.ts");
        const { CrystalAssets } = await import("/src/game/rom/assets.ts");
        const { romRevision } = await import("/src/game/rom/revision.ts");
        const { JOHTO } = await import("/src/game/rom/profile.ts");
        const { battleTowerText, emptyBattleTowerState } = await import("/src/game/scripts/battle-tower.ts");
        const rom = new Uint8Array(
          await (document.querySelector("#reference-fixture") as HTMLInputElement).files![0].arrayBuffer(),
        );
        const assets = new CrystalAssets(rom);
        const r = assets.reader;
        // PrintTextboxTextAt: keep HL at program + $f0 and return.
        const kept = a.program + 0xf0;
        [0x7d, 0xea, kept & 255, kept >> 8, 0x7c, 0xea, (kept + 1) & 255, (kept + 1) >> 8, 0xc9].forEach(
          (value, i) => (rom[routines.print.address + i] = value),
        );
        const reference = new BinjgbEmulator();
        await reference.load(rom, document.createElement("canvas"));
        reference.setMuted(true);
        const read = (p: number) => reference.readMemory(p);
        const write = (p: number, v: number) => reference.writeMemory(p, v & 255);
        reference.advanceFrames(300);
        const sentinel = a.program + 0xf8;
        const failures: unknown[] = [];
        let compared = 0;
        for (let trainer = 0; trainer < 70; trainer++)
          for (const roll of [0x00, 0x0e, 0x13, 0x1f, 0x9b, 0xff]) {
            const bt = emptyBattleTowerState();
            const entry = JOHTO.BattleTowerTrainers + trainer * 11;
            bt.opponent = { trainer, name: "", trainerClass: r.byte(entry + 10), party: [] };
            for (const which of [1, 2, 3] as const) {
              write(0xff70, a.name.bank);
              for (let i = 0; i < 11; i++) write(a.name.address + i, r.byte(entry + i));
              write(0xff70, 1);
              write(a.randomAdd, roll);
              write(sentinel, 0);
              const program = [
                0xf3, 0x31, a.stackTop & 255, a.stackTop >> 8,
                0x3e, routines.text.bank, 0xe0, a.romBank & 255, 0xea, 0, 0x20,
                0x0e, which,
                0xcd, routines.text.address & 255, routines.text.address >> 8,
                0x3e, 0x42, 0xea, sentinel & 255, sentinel >> 8,
                0x18, 0xfe,
              ];
              program.forEach((v, i) => write(a.program + i, v));
              reference.setProgramCounter(a.program);
              for (let frame = 0; frame < 10 && read(sentinel) !== 0x42; frame++) reference.advanceFrames(1);
              const original = read(kept) | (read(kept + 1) << 8);
              // A flat offset in BattleTowerText's bank, as the CPU sees it.
              const flat = battleTowerText({ reader: r, random: () => roll } as never, bt, which);
              const native = r.bank(flat) === routines.text.bank ? (flat & 0x3fff) | 0x4000 : -flat;
              compared++;
              if (read(sentinel) !== 0x42 || original !== native)
                failures.push({ trainer, roll, which, original: original.toString(16), native: native.toString(16) });
            }
          }
        reference.dispose();
        return { revision: romRevision(r), compared, failures: failures.slice(0, 8), failed: failures.length };
      },
      { a, routines, revision },
    );
    expect(result.revision).toBe(revision);
    expect(result.failures, JSON.stringify(result)).toEqual([]);
    expect(result.compared).toBe(70 * 6 * 3);
  });