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 { settle } from "./world-driver";

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

describe.skipIf(!existsSync(romPath))("Azalea Town with the local ROM", () => {
  const bytes = existsSync(romPath) ? new Uint8Array(readFileSync(romPath)) : new Uint8Array();
  const KURTS_HOUSE = "8:4";
  const EVENT_CLEARED_SLOWPOKE_WELL = 0x2b,
    EVENT_KURT_GAVE_YOU_LURE_BALL = 0x35,
    EVENT_GAVE_KURT_RED_APRICORN = 0x258,
    ENGINE_KURT_MAKING_BALLS = 80;
  const RED_APRICORN = 0x55,
    BLU_APRICORN = 0x56,
    LEVEL_BALL = 0x9f;

  const world = (day: number) => {
    let seed = 9;
    const game = new GameWorld(
      new CrystalAssets(bytes),
      () => new Date(`2026-09-${day}T12:00:00`),
      () => {
        seed = (seed * 1103515245 + 12345) >>> 0;
        return (seed >>> 16) & 255;
      },
    );
    game.state.party.push(
      generatePartyMon(game.assets.pokemon, {
        species: 155, level: 20, item: 0, otId: game.playerId, ot: "CHRIS", dvs: 0x8888, caughtData: 0,
      }),
    );
    return game;
  };
  /** Answer menus and quantities in order, collecting the pages shown. */
  const answer = (game: GameWorld, answers: number[]) => {
    const pages: string[] = [];
    for (let tick = 0; tick < 5000; tick++) {
      const dialogue = game.dialogue;
      if (dialogue) {
        const page = dialogue.pages[dialogue.index];
        if (page && pages.at(-1) !== page) pages.push(page.replace(/\n/g, " "));
        if (dialogue.index === dialogue.pages.length - 1 && dialogue.choice) {
          const choice = dialogue.choice;
          if (choice.kind === "martquantity") {
            pages.push(choice.prompt.replace(/\n/g, " "));
            const wanted = answers.shift()!;
            while (choice.selected < wanted) game.moveCursor("up");
            game.choose(choice.selected);
          } else game.choose(answers.shift() ?? 0);
        } else game.advanceDialogue();
        continue;
      }
      if (!game.busy) break;
      game.tick();
    }
    expect(game.notice, game.diagnostic).toBe("");
    return pages.join(" ");
  };

  it("makes Level Balls from Red Apricorns by the next day", () => {
    const game = world(22);
    game.state.events.add(EVENT_CLEARED_SLOWPOKE_WELL);
    game.state.events.add(EVENT_KURT_GAVE_YOU_LURE_BALL);
    game.state.bag.items = [
      { item: BLU_APRICORN, quantity: 1 },
      { item: RED_APRICORN, quantity: 4 },
    ];
    game.restore({ ...game.save(), map: KURTS_HOUSE, x: 3, y: 3, direction: "up" });
    settle(game);
    game.interact();
    // The list follows ApricornBalls: RED before BLU. Three of four.
    let pages = answer(game, [0, 3]);
    expect(pages).toContain("Which APRICORN");
    expect(pages).toContain("How many");
    expect(game.state.events.has(EVENT_GAVE_KURT_RED_APRICORN)).toBe(true);
    expect(game.state.flags.has(ENGINE_KURT_MAKING_BALLS)).toBe(true);
    expect(game.state.memory.wKurtApricornQuantity).toBe(3);
    expect(game.state.bag.items).toEqual([
      { item: BLU_APRICORN, quantity: 1 },
      { item: RED_APRICORN, quantity: 1 },
    ]);
    // The next day, ENGINE_KURT_MAKING_BALLS is cleared and the balls are
    // ready.
    const next = world(23);
    next.restore(JSON.parse(JSON.stringify(game.save())));
    settle(next);
    expect(next.state.flags.has(ENGINE_KURT_MAKING_BALLS)).toBe(false);
    // EVENT_TEMPORARY_UNTIL_MAP_RELOAD_1 clears when the house is entered
    // again (ResetMapBufferEventFlags).
    next.warpTo(KURTS_HOUSE, 3, 3);
    settle(next);
    next.move("up"); // Kurt: this only turns the player
    next.interact();
    pages = answer(next, [1]);
    expect(next.state.bag.balls).toContainEqual({ item: LEVEL_BALL, quantity: 3 });
    expect(next.state.events.has(EVENT_GAVE_KURT_RED_APRICORN)).toBe(false);
  });

  it("returns to the apricorn list when the quantity is cancelled", () => {
    const game = world(22);
    game.state.events.add(EVENT_CLEARED_SLOWPOKE_WELL);
    game.state.events.add(EVENT_KURT_GAVE_YOU_LURE_BALL);
    game.state.bag.items = [{ item: RED_APRICORN, quantity: 2 }];
    game.restore({ ...game.save(), map: KURTS_HOUSE, x: 3, y: 3, direction: "up" });
    settle(game);
    game.interact();
    // RED, cancel the quantity, then CANCEL the list.
    for (let tick = 0; tick < 200 && game.dialogue?.choice?.kind !== "menu"; tick++)
      if (game.dialogue && !game.dialogue.choice) game.advanceDialogue();
      else game.tick();
    game.choose(0);
    expect(game.dialogue?.choice?.kind).toBe("martquantity");
    game.choose(-1);
    for (let tick = 0; tick < 200 && game.dialogue?.choice?.kind !== "menu"; tick++)
      if (game.dialogue && !game.dialogue.choice) game.advanceDialogue();
      else game.tick();
    expect(game.dialogue?.choice?.kind).toBe("menu");
    game.choose(1);
    const pages = answer(game, []);
    expect(pages).toContain("letdown");
    expect(game.state.bag.items).toEqual([{ item: RED_APRICORN, quantity: 2 }]);
  });
});