import { mkdtempSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { beforeAll, describe, expect, it, vi } from "vitest";

// The store reads its directory when first imported, so the rooms module is
// loaded only after the ledgers have somewhere of their own to go.
process.env.WIZWAR_DATA_DIR = join(mkdtempSync(join(tmpdir(), "wizwar-seats-")), "rooms");

let rooms: typeof import("../src/rooms");
beforeAll(async () => {
  rooms = await import("../src/rooms");
  rooms.loadPersistedRooms();
});

/** Ann hosts, Bo and Cy sit, and the boards have flipped. */
function playing() {
  const { room, token: ann } = rooms.createRoom("Ann");
  const bo = token(rooms.joinRoom(room, "Bo", null));
  const cy = token(rooms.joinRoom(room, "Cy", null));
  const started = rooms.startGame(room, false);
  if ("error" in started) throw new Error(started.error);
  return { room, ann, bo, cy };
}

function token(result: { token: string } | { error: string }): string {
  if ("error" in result) throw new Error(result.error);
  return result.token;
}

function phrase(result: { code: string } | { error: string }): string {
  if ("error" in result) throw new Error(result.error);
  return result.code;
}

describe("a stand-in", () => {
  it("plays a person's seat the host gives it, and the person's token opens nothing", () => {
    const { room, bo } = playing();
    expect(rooms.standIn(room, "Ann", "Bo")).toEqual({ event: { type: "seatChanged", player: "Bo", to: "clockwork", by: "Ann" } });
    expect(room.bots.get("Bo")).toMatchObject({ standIn: true, secret: true });
    expect(rooms.joinRoom(room, "Bo", bo)).toEqual({ error: "the host gave this seat to the clockwork; ask them for a phrase to take it back" });
    expect(room.players).toContain("Bo");
  });

  it("takes the turn when the seat it stands in for holds it, and leaves the host's to the host", () => {
    const { room } = playing();
    rooms.standIn(room, "Ann", "Bo");
    rooms.standIn(room, "Ann", "Cy");
    const holder = room.state!.players[room.state!.turn.activeIndex]!.id;
    expect(rooms.driveOneAutomaton(room)?.seat ?? null).toBe(holder === "Ann" ? null : holder);
  });

  it("is the host's call alone, in a game under way, for a person still in it", () => {
    const { room } = playing();
    expect(rooms.standIn(room, "Bo", "Cy")).toEqual({ error: "only the host may give a seat to the clockwork" });
    expect(rooms.standIn(room, "Ann", "Ann")).toEqual({ error: "the host keeps their own seat" });
    expect(rooms.standIn(room, "Ann", "Dee")).toEqual({ error: "no person sits in that seat" });
    rooms.standIn(room, "Ann", "Bo");
    expect(rooms.standIn(room, "Ann", "Bo")).toEqual({ error: "no person sits in that seat" });

    const { room: lobby } = rooms.createRoom("Ann");
    rooms.joinRoom(lobby, "Bo", null);
    expect(rooms.standIn(lobby, "Ann", "Bo")).toEqual({ error: "only a game under way needs a stand-in" });
  });

  it("is still standing in after a reload from the ledger", async () => {
    const { room, bo } = playing();
    rooms.standIn(room, "Ann", "Bo");
    vi.resetModules();
    const reloaded: typeof import("../src/rooms") = await import("../src/rooms");
    const again = reloaded.getRoom(room.id)!;
    expect(again).not.toBe(room);
    expect(again.bots.get("Bo")).toEqual(room.bots.get("Bo"));
    expect(again.events.filter((e) => e.type === "seatChanged")).toEqual([{ type: "seatChanged", player: "Bo", to: "clockwork", by: "Ann" }]);
    expect("error" in reloaded.joinRoom(again, "Bo", bo)).toBe(true);
  });
  it("holds the person's seat at a rematch, and brings no automaton for it", () => {
    const { room } = playing();
    rooms.standIn(room, "Ann", "Bo");
    room.state = { ...room.state!, phase: "finished" };
    const called = rooms.callRematch(room, "Ann");
    if ("error" in called) throw new Error(called.error);
    const next = rooms.getRoom(called.roomId)!;
    expect(next.expected).toEqual(["Bo", "Cy"]);
    expect(next.bots.size).toBe(0);
  });
});

describe("a phrase the host makes", () => {
  it("re-seats a person whose browser lost the seat: the old token is refused, the new one opens it", () => {
    const { room, bo } = playing();
    const claimed = rooms.claimTransferCode(phrase(rooms.makeSeatPhrase(room, "Ann", "Bo")));
    if ("error" in claimed) throw new Error(claimed.error);
    expect(claimed).toMatchObject({ roomId: room.id, name: "Bo", reseated: true });
    expect(claimed.token).not.toBe(bo);
    expect("error" in rooms.joinRoom(room, "Bo", bo)).toBe(true);
    expect(rooms.joinRoom(room, "Bo", claimed.token)).toEqual({ token: claimed.token });
  });

  it("takes a seat back from the clockwork", () => {
    const { room } = playing();
    rooms.standIn(room, "Ann", "Bo");
    const claimed = rooms.claimTransferCode(phrase(rooms.makeSeatPhrase(room, "Ann", "Bo")));
    if ("error" in claimed) throw new Error(claimed.error);
    expect(room.bots.has("Bo")).toBe(false);
    expect(claimed.returned).toEqual({ type: "seatChanged", player: "Bo", to: "person" });
    expect(rooms.joinRoom(room, "Bo", claimed.token)).toEqual({ token: claimed.token });
  });

  it("keeps the seat a person's again after a reload from the ledger", async () => {
    const { room } = playing();
    rooms.standIn(room, "Ann", "Bo");
    const claimed = rooms.claimTransferCode(phrase(rooms.makeSeatPhrase(room, "Ann", "Bo")));
    if ("error" in claimed) throw new Error(claimed.error);
    vi.resetModules();
    const reloaded: typeof import("../src/rooms") = await import("../src/rooms");
    const again = reloaded.getRoom(room.id)!;
    expect(again.bots.has("Bo")).toBe(false);
    expect(again.events.filter((e) => e.type === "seatChanged").map((e) => (e as { to: string }).to)).toEqual(["clockwork", "person"]);
    expect(reloaded.joinRoom(again, "Bo", claimed.token)).toEqual({ token: claimed.token });
  });

  it("is the host's to make, and only for a person's seat", () => {
    const { room } = playing();
    expect(rooms.makeSeatPhrase(room, "Bo", "Cy")).toEqual({ error: "only the host may make a phrase for another seat" });
    expect(rooms.makeSeatPhrase(room, "Ann", "Dee")).toEqual({ error: "no person sits in that seat" });
    const { room: withBot } = rooms.createRoom("Ann");
    const bot = rooms.addAutomaton(withBot);
    if ("error" in bot) throw new Error(bot.error);
    expect(rooms.makeSeatPhrase(withBot, "Ann", bot.name)).toEqual({ error: "no person sits in that seat" });
  });

  it("works once", () => {
    const { room } = playing();
    const code = phrase(rooms.makeSeatPhrase(room, "Ann", "Cy"));
    expect("error" in rooms.claimTransferCode(code)).toBe(false);
    expect(rooms.claimTransferCode(code)).toEqual({ error: "that transfer phrase is unknown or has expired" });
  });

  it("is voided when the host gives the seat to the clockwork after making it", () => {
    const { room } = playing();
    const code = phrase(rooms.makeSeatPhrase(room, "Ann", "Bo"));
    rooms.standIn(room, "Ann", "Bo");
    expect("error" in rooms.claimTransferCode(code)).toBe(true);
  });
});

describe("a player's own transfer phrase", () => {
  it("still hands over the same token, without re-seating", () => {
    const { room, bo } = playing();
    const claimed = rooms.claimTransferCode(phrase(rooms.makeTransferCode(room, "Bo", bo)));
    expect(claimed).toEqual({ roomId: room.id, name: "Bo", token: bo, reseated: false });
  });
});