import { describe, expect, it } from "vitest";
import { existsSync, readFileSync } from "node:fs";
import { CrystalAssets } from "../src/game/rom/assets";
import { GameWorld } from "../src/game/world/world";
import { generatePartyMon } from "../src/game/party/pokemon";
import { Playthrough } from "./playthrough-driver";
import { findPath } from "./world-driver";

const romPath =
  process.env.CRYSTAL_ROM_PATH ?? "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc";

describe.skipIf(!existsSync(romPath))("the Radio Tower takeover with the local ROM", () => {
  const assets = existsSync(romPath)
    ? new CrystalAssets(new Uint8Array(readFileSync(romPath)))
    : undefined;

  const SWITCH_ROOM = "3:54",
    WAREHOUSE = "3:56",
    RADIO_TOWER_5F = "3:21",
    GOLDENROD = "11:2";
  const TYPHLOSION = 157,
    SCENE_GOLDENRODUNDERGROUNDSWITCHROOMENTRANCES_NOOP = 1,
    SCENE_RADIOTOWER5F_ROCKET_BOSS = 1;
  const EVENT_SWITCH_1 = 0x2d3,
    EVENT_DOOR_1_OPEN = 0x2d7,
    EVENT_RADIO_TOWER_ROCKET_TAKEOVER = 0x6ce,
    EVENT_CLEARED_RADIO_TOWER = 0x21,
    EVENT_GOT_CLEAR_BELL = 0x78,
    ENGINE_ROCKETS_IN_RADIO_TOWER = 0x13;
  /** RADIOTOWER5F_DIRECTOR, the first object (no event flag). */
  const DIRECTOR = 2;

  /** A playthrough driver on a fresh world with one Pokémon at `level`. */
  const driver = (level: number) => {
    const p = new Playthrough(assets!);
    p.world = new GameWorld(assets!, p.now, p.random);
    p.world.state.party = [
      generatePartyMon(assets!.pokemon, {
        species: TYPHLOSION,
        level,
        item: 0,
        otId: p.world.playerId,
        ot: "KAWA",
        dvs: 0xffff,
        caughtData: 0,
      }),
    ];
    return p;
  };
  /** The switches, from switch 1 on the right, and the doors' events. */
  const SWITCHES = [
    [16, 1],
    [10, 1],
    [2, 1],
  ] as const;
  const flags = (world: GameWorld) =>
    Array.from({ length: 15 }, (_, i) => +world.state.events.has(EVENT_SWITCH_1 + i)).join("");

  it("keeps the switches and doors through a reload until the warehouse resets them", () => {
    const p = driver(70);
    const { world } = p;
    world.state.scenes[SWITCH_ROOM] = SCENE_GOLDENRODUNDERGROUNDSWITCHROOMENTRANCES_NOOP;
    world.warpTo(SWITCH_ROOM, 23, 3);
    p.play();
    // Every door is shut, so the warehouse (22, 10) is out of reach.
    expect(() => findPath(world, 22, 10)).toThrow();
    for (const [x, y] of [SWITCHES[2], SWITCHES[1], SWITCHES[0]]) {
      p.walk(x, y + 1);
      world.move("up");
      world.interact();
      p.play([1]);
    }
    // Positions 3, 5 and 6 in turn: doors 3, 5, 6, 8, 9 and 11 stay open.
    expect(world.save().memory).toMatchObject({ wUndergroundSwitchPositions: 6 });
    expect(flags(world)).toBe("111000101101101");
    expect(findPath(world, 22, 10).length).toBeGreaterThan(0);
    // The tiles callback reopens the doors after a reload.
    p.reload();
    expect(flags(p.world)).toBe("111000101101101");
    expect(findPath(p.world, 22, 10).length).toBeGreaterThan(0);
    p.walk(22, 10);
    expect(p.world.mapId).toBe(WAREHOUSE);
    // GoldenrodUndergroundWarehouseResetSwitchesCallback.
    expect(flags(p.world)).toBe("0".repeat(15));
    expect(p.world.save().memory).toMatchObject({ wUndergroundSwitchPositions: 0 });
    expect(p.world.state.events.has(EVENT_DOOR_1_OPEN)).toBe(false);
  });

  it("whites out cleanly when the rival in the switch room wins", () => {
    const p = driver(2);
    const { world } = p;
    world.state.money = 3000;
    world.warpTo(SWITCH_ROOM, 23, 3);
    p.play();
    // UndergroundRivalScene1: the battle runs inside an scall, and the loss
    // jumps to Script_Whiteout, whose endall drops the caller.
    world.restore({ ...world.save(), x: 18, y: 4, direction: "right" });
    world.move("right");
    p.play();
    expect(world.notice, world.diagnostic).toBe("");
    expect(p.log.join(" ")).toContain("whited\nout!");
    expect(world.mapId).not.toBe(SWITCH_ROOM);
    expect(world.state.money).toBe(1500);
    expect(world.state.party[0].hp).toBe(world.state.party[0].stats[0]);
  });

  it("keeps the director gone after a save once he walks out on 5F", () => {
    const p = driver(80);
    const { world } = p;
    world.state.flags.add(ENGINE_ROCKETS_IN_RADIO_TOWER);
    world.state.scenes[RADIO_TOWER_5F] = SCENE_RADIOTOWER5F_ROCKET_BOSS;
    world.warpTo(RADIO_TOWER_5F, 15, 5);
    p.play();
    p.world.move("right");
    p.play();
    p.world.move("right");
    p.play();
    expect(world.state.events.has(EVENT_CLEARED_RADIO_TOWER)).toBe(true);
    expect(world.state.events.has(EVENT_GOT_CLEAR_BELL)).toBe(true);
    expect(world.state.events.has(EVENT_RADIO_TOWER_ROCKET_TAKEOVER)).toBe(true);
    // He has no event flag: disappear only removes his object struct,
    // which Continue keeps as saved.
    expect(world.objects().some((object) => object.id === DIRECTOR)).toBe(false);
    expect(world.save().objects).toContainEqual(
      expect.objectContaining({ id: DIRECTOR, hidden: true }),
    );
    p.reload();
    expect(p.world.objects().some((object) => object.id === DIRECTOR)).toBe(false);
    // The stairs he walked out by are free.
    expect(findPath(p.world, 12, 0).length).toBeGreaterThan(0);
    // A later visit rebuilds the objects from the map: he is back.
    p.travel(GOLDENROD, ["3:17", "3:18", "3:19", "3:20", "3:21"]);
    p.world.warpTo(RADIO_TOWER_5F, 0, 1);
    p.play();
    expect(p.world.objects().some((object) => object.id === DIRECTOR)).toBe(true);
  });
});