import { describe, expect, it } from "vitest";
import { existsSync, mkdirSync, readFileSync, writeFileSync } 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 { addHallOfFameEntry } from "../src/game/party/hall-of-fame";
import { ENGINE_FLAGS } from "../src/game/rom/profile";
import { CRYSTAL_ROM } from "../src/rom/validate";
import { encodeSave } from "../src/storage/saves";
import { foundationFixture } from "./foundation-fixture";
import { settle } from "./world-driver";

// Backups for the manual checks on the project board's "A tester" column,
// built from the local ROM and imported through Savegames → Import backup
// (then "Add as a new save"). They hold names read from the ROM, so they
// stay out of the repository (*.crystal-save.json is ignored).
//
//   MAKE_TEST_SAVES=1 npx vitest run tests/human-test-saves.test.ts
const romPath =
  process.env.CRYSTAL_ROM_PATH ??
  "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc";
const OUT = "test-saves";
/** NativeRuntime.id, which an imported backup must name. */
const CORE_ID = "crystal-native-world-v1";

describe.skipIf(!existsSync(romPath) || !process.env.MAKE_TEST_SAVES)(
  "saves for manual testing",
  () => {
    const assets = () =>
      new CrystalAssets(new Uint8Array(readFileSync(romPath)));
    function write(name: string, world: GameWorld) {
      const state = new TextEncoder().encode(JSON.stringify(world.save()));
      // The backup must load as the app would load it.
      new GameWorld(assets()).restore(
        JSON.parse(new TextDecoder().decode(state)),
      );
      mkdirSync(OUT, { recursive: true });
      writeFileSync(
        `${OUT}/${name}.crystal-save.json`,
        encodeSave({
          version: 1,
          romHash: CRYSTAL_ROM.sha1,
          coreId: CORE_ID,
          savedAt: new Date().toISOString(),
          state,
        }),
      );
    }

    it("writes fly-teleport: New Bark Town with Fly, Teleport and Escape Ropes", () => {
      const a = assets();
      // Pidgeot with Fly, the Storm Badge, New Bark and Cherrygrove visited.
      const world = foundationFixture(a, "fly");
      const abra = generatePartyMon(a.pokemon, {
        species: 63, // ABRA
        level: 20,
        item: 0,
        otId: world.playerId,
        ot: "CHRIS",
        dvs: 0x9abc,
        caughtData: 0,
      });
      abra.moves = [0x64, 0, 0, 0]; // TELEPORT
      abra.pp = [20, 0, 0, 0];
      world.state.party.push(abra);
      // Violet City too, whose map is not ported yet.
      world.state.flags.add(a.spawnEngineFlag(16)!);
      world.state.lastSpawnMap = "26:3"; // Cherrygrove City
      world.state.bag.items = [{ item: 0x13, quantity: 3 }]; // ESCAPE ROPE
      expect(world.mapId).toBe("24:4");
      write("fly-teleport", world);
    });

    it("writes field-items: New Bark Town's shore with rods, MAIL and a Repel", () => {
      const a = assets();
      // Cyndaquil facing the sea with the Old Rod.
      const world = foundationFixture(a, "fishing");
      world.state.party.push(
        generatePartyMon(a.pokemon, {
          species: 16, // PIDGEY
          level: 4,
          item: 0,
          otId: world.playerId,
          ot: "CHRIS",
          dvs: 0x9abc,
          caughtData: 0,
        }),
      );
      world.state.bag.items = [
        { item: 0x12, quantity: 5 }, // POTION
        { item: 0x9e, quantity: 2 }, // FLOWER_MAIL
        { item: 0x14, quantity: 1 }, // REPEL
      ];
      world.state.bag.keyItems.push(0x3b, 0x3d); // GOOD_ROD, SUPER_ROD
      expect(world.mapId).toBe("24:4");
      write("field-items", world);
    });

    it("writes headbutt: Route 29 facing a Headbutt tree", () => {
      // Totodile with Headbutt and Tackle, below the first reachable tree.
      const world = foundationFixture(assets(), "headbutt");
      expect(world.mapId).toBe("24:3");
      write("headbutt", world);
    });

    /** A Pokémon of the player's, from (species, level, DVs). */
    const caught = (
      a: CrystalAssets,
      world: GameWorld,
      species: number,
      level: number,
      dvs = 0x9abc,
    ) =>
      generatePartyMon(a.pokemon, {
        species,
        level,
        item: 0,
        otId: world.playerId,
        ot: "CHRIS",
        dvs,
        caughtData: 0,
      });

    it("writes day-care: inside the Day-Care with a pair that breeds", () => {
      const a = assets();
      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
      // A female Cyndaquil and a male Typhlosion (Attack and Speed DVs 0
      // and 15), and a Totodile to keep. The Odd Egg is still to come.
      world.state.party = [
        caught(a, world, 155, 20, 0x0201), // CYNDAQUIL
        caught(a, world, 157, 40, 0xf7f2), // TYPHLOSION
        caught(a, world, 158, 15), // TOTODILE
      ];
      world.state.money = 50000;
      world.warpTo("11:24", 2, 4); // facing the man
      settle(world);
      world.restore({ ...world.save(), direction: "up" });
      expect(world.mapId).toBe("11:24");
      write("day-care", world);
    });

    it("writes egg-hatching: Route 29 with two Eggs two steps from hatching", () => {
      const a = assets();
      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
      const egg = (species: number, dvs: number, happiness: number) => ({
        ...caught(a, world, species, 5, dvs),
        egg: true as const,
        nickname: "EGG",
        happiness,
        hp: 0,
      });
      // The Togepi Egg reaches zero on step 128 and stops DoEggStep; the
      // shiny Pichu's is already zero, so both hatch.
      world.state.party = [
        caught(a, world, 155, 20),
        egg(175, 0x8888, 1), // TOGEPI
        egg(172, 0x2aaa, 0), // PICHU
      ];
      world.restore({
        ...world.save(),
        map: "24:3",
        x: 12,
        y: 3,
        direction: "left",
        stepCount: 0x7e,
      });
      settle(world);
      write("egg-hatching", world);
    });

    it("writes hall-of-fame-ceremony: the Hall of Fame's entrance, where Lance's scene and the ceremony start", () => {
      const a = assets();
      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
      world.state.flags.add(ENGINE_FLAGS.pokedex);
      for (let badge = 0x1b; badge < 0x1b + 8; badge++) world.state.flags.add(badge);
      world.state.party = [
        caught(a, world, 157, 60, 0x9abc), // TYPHLOSION
        caught(a, world, 25, 40, 0x2aaa), // PIKACHU, shiny
        caught(a, world, 201, 40, 0xffff), // UNOWN
        { ...caught(a, world, 175, 5), egg: true }, // an Egg, left out
      ];
      for (const species of [157, 25, 201]) {
        world.state.pokedex.seen.add(species);
        world.state.pokedex.caught.add(species);
      }
      // The Hall of Fame's own warp; continuing runs HallOfFameEnterScene.
      world.restore({ ...world.save(), map: "16:8", x: 4, y: 13, direction: "up", objects: [] });
      write("hall-of-fame-ceremony", world);
    });

    it("writes hall-of-fame: a Pokémon Center whose PC has three teams", () => {
      const a = assets();
      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
      world.state.flags.add(ENGINE_FLAGS.pokedex);
      const record = (party: [number, number, number][]) =>
        addHallOfFameEntry(
          world.state,
          party.map(([species, level, dvs]) =>
            caught(a, world, species, level, dvs),
          ),
        );
      record([[201, 50, 0xffff]]); // UNOWN
      record([
        [157, 55, 0x9abc], // TYPHLOSION
        [29, 30, 0x0000], // NIDORAN♀
        [32, 31, 0xffff], // NIDORAN♂
        [25, 100, 0x2aaa], // PIKACHU, shiny
        [175, 12, 0x9abc], // TOGEPI
        [249, 70, 0x9abc], // LUGIA
      ]);
      record([[158, 42, 0x9abc]]); // TOTODILE
      world.state.party = [caught(a, world, 155, 20)];
      world.restore({
        ...world.save(),
        map: "26:5",
        x: 9,
        y: 2,
        direction: "up",
        objects: [],
      });
      settle(world);
      write("hall-of-fame", world);
    });
  },
);