import { CrystalAssets } from "../src/game/rom/assets";
import { generatePartyMon } from "../src/game/party/pokemon";
import { GameWorld } from "../src/game/world/world";
import { settle } from "./world-driver";

// EVENT_GOT_CYNDAQUIL/TOTODILE/CHIKORITA_FROM_ELM.
const STARTER_EVENTS: Record<number, number> = { 155: 27, 158: 28, 152: 29 };

/** Only the starting position and earlier starter choice are fixtures.
 * The house rewards and return scenes come from the untouched ROM scripts. */
export function questFixtureWorld(assets: CrystalAssets, species = 158) {
  // A seeded Random: a constant byte never ends BattleRandom retry loops
  // such as BattleCommand_DamageVariation's.
  let seed = 1;
  const world = new GameWorld(assets, () => new Date("2026-09-22T12:00:00"), () => {
    seed = (seed * 1103515245 + 12345) >>> 0;
    return (seed >>> 16) & 255;
  });
  const mon = generatePartyMon(assets.pokemon, {
    species, level: 20, item: 0, otId: world.playerId,
    ot: "CHRIS", dvs: 0xffff, caughtData: 0,
  });
  mon.moves = [10, 0, 0, 0];
  mon.pp = [35, 0, 0, 0];
  mon.hp = 1; // Mr. Pokémon must actually heal the party.
  world.state.party = [mon];
  world.state.pokedex.seen.add(species);
  world.state.pokedex.caught.add(species);
  world.state.events.add(26); // GOT_A_POKEMON_FROM_ELM
  world.state.events.add(STARTER_EVENTS[species]);
  world.restore({ ...world.save(), map: "26:1", x: 17, y: 6, direction: "up" });
  return world;
}

/** Independent rival UI fixture, derived from completing the actual house
 * scene, then relocated to the city's return trigger. This is not a full walk. */
export function questRivalFixtureWorld(assets: CrystalAssets, species = 158) {
  const world = questFixtureWorld(assets, species);
  if (!world.move("up")) throw new Error("Could not enter Mr. Pokémon's house.");
  settle(world);
  if (world.notice || !world.state.events.has(30))
    throw new Error(`House fixture did not complete: ${world.diagnostic}`);
  // The house's moved objects (Mr. Pokémon, Oak) must not carry over. The
  // Guide Gent still stands at 32,6; one step right reaches 33,7's trigger.
  world.restore({ ...world.save(), map: "26:3", x: 32, y: 7, direction: "right", objects: [] });
  return world;
}

/** The house scene completed for real, then relocated below Elm's lab door
 * in New Bark Town. Elm's robbed call stays queued: the door step warps,
 * and calls do not ring indoors. */
export function questLabFixtureWorld(assets: CrystalAssets) {
  const world = questFixtureWorld(assets);
  if (!world.move("up")) throw new Error("Could not enter Mr. Pokémon's house.");
  settle(world);
  if (world.notice || !world.state.events.has(30))
    throw new Error(`House fixture did not complete: ${world.diagnostic}`);
  world.restore({ ...world.save(), map: "24:4", x: 6, y: 4, direction: "up", objects: [] });
  return world;
}