import { expect, test } from "bun:test";
import { forEachDialect } from "@sttracker/db/testing";
import {
  createAppToken,
  createInvite,
  getSessionUser,
  login,
  logout,
  registerUser,
  revokeAppToken,
  verifyAppToken,
} from "../src/auth.ts";
import { AuthError } from "../src/errors.ts";

async function code(p: Promise<unknown>): Promise<string | undefined> {
  try {
    await p;
  } catch (e) {
    return e instanceof AuthError ? e.code : "other";
  }
  return undefined;
}

forEachDialect("auth", (getDb) => {
  test("first user is admin and username is lowercased", async () => {
    const u = await registerUser(getDb(), { username: "Alice", password: "pw-one" });
    expect(u.role).toBe("admin");
    expect(u.username).toBe("alice");
    expect(u.displayName).toBe("alice");
  });

  test("invalid and duplicate usernames are rejected", async () => {
    const db = getDb();
    expect(await code(registerUser(db, { username: "a b", password: "x" }))).toBe("invalid_username");
    await registerUser(db, { username: "alice", password: "x" });
    const inv = await createInvite(db, (await login(db, "alice", "x")).user.id);
    expect(await code(registerUser(db, { username: "ALICE", password: "x", inviteCode: inv }))).toBe(
      "username_taken",
    );
  });

  test("second user needs a single-use invite", async () => {
    const db = getDb();
    const admin = await registerUser(db, { username: "alice", password: "x" });
    expect(await code(registerUser(db, { username: "bob", password: "x" }))).toBe("invite_required");
    expect(await code(registerUser(db, { username: "bob", password: "x", inviteCode: "nope" }))).toBe(
      "invite_required",
    );
    const inv = await createInvite(db, admin.id);
    const bob = await registerUser(db, { username: "bob", password: "x", inviteCode: inv });
    expect(bob.role).toBe("member");
    expect(await code(registerUser(db, { username: "carol", password: "x", inviteCode: inv }))).toBe(
      "invite_required",
    );
  });

  test("expired invite is rejected; members cannot create invites", async () => {
    const db = getDb();
    const admin = await registerUser(db, { username: "alice", password: "x" });
    const inv = await createInvite(db, admin.id, -1);
    expect(await code(registerUser(db, { username: "bob", password: "x", inviteCode: inv }))).toBe(
      "invite_required",
    );
    const ok = await createInvite(db, admin.id);
    const bob = await registerUser(db, { username: "bob", password: "x", inviteCode: ok });
    expect(await code(createInvite(db, bob.id))).toBe("forbidden");
  });

  test("wrong password or unknown user -> invalid_credentials", async () => {
    const db = getDb();
    await registerUser(db, { username: "alice", password: "right" });
    expect(await code(login(db, "alice", "wrong"))).toBe("invalid_credentials");
    expect(await code(login(db, "nobody", "x"))).toBe("invalid_credentials");
  });

  test("session round-trip and logout", async () => {
    const db = getDb();
    await registerUser(db, { username: "alice", password: "pw" });
    const { user, sessionToken } = await login(db, "Alice", "pw");
    expect(await getSessionUser(db, sessionToken)).toEqual(user);
    const stored = await db.k.selectFrom("sessions").selectAll().execute();
    expect(stored[0]!.token_hash).not.toBe(sessionToken);
    await logout(db, sessionToken);
    expect(await getSessionUser(db, sessionToken)).toBeNull();
    expect(await getSessionUser(db, "garbage")).toBeNull();
  });

  test("expired session returns null", async () => {
    const db = getDb();
    await registerUser(db, { username: "alice", password: "pw" });
    const { sessionToken } = await login(db, "alice", "pw");
    await db.k.updateTable("sessions").set({ expires_at: new Date(Date.now() - 1000).toISOString() }).execute();
    expect(await getSessionUser(db, sessionToken)).toBeNull();
  });

  test("app tokens: scope check, last_used_at, revoke", async () => {
    const db = getDb();
    const u = await registerUser(db, { username: "alice", password: "pw" });
    const { id, token } = await createAppToken(db, u.id, "cli", ["read"]);
    expect(token.startsWith("stt_")).toBe(true);
    expect(await verifyAppToken(db, token, "write")).toBeNull();
    expect(await verifyAppToken(db, token, "read")).toEqual(u);
    const row = await db.k.selectFrom("app_tokens").selectAll().executeTakeFirstOrThrow();
    expect(row.last_used_at).not.toBeNull();
    expect(await verifyAppToken(db, "stt_bogus", "read")).toBeNull();
    await revokeAppToken(db, u.id, id);
    expect(await verifyAppToken(db, token, "read")).toBeNull();
  });

  test("concurrent first registrations yield exactly one admin", async () => {
    const db = getDb();
    const results = await Promise.allSettled([
      registerUser(db, { username: "alice", password: "x" }),
      registerUser(db, { username: "bob", password: "x" }),
    ]);
    const ok = results.filter((r) => r.status === "fulfilled");
    const bad = results.filter((r) => r.status === "rejected");
    expect(ok.length).toBe(1);
    expect((ok[0] as PromiseFulfilledResult<{ role: string }>).value.role).toBe("admin");
    expect(((bad[0] as PromiseRejectedResult).reason as AuthError).code).toBe("invite_required");
    const admins = await db.k.selectFrom("users").select("id").where("role", "=", "admin").execute();
    expect(admins.length).toBe(1);
  });

  test("no invite means invite_required even for a taken username", async () => {
    const db = getDb();
    await registerUser(db, { username: "alice", password: "x" });
    expect(await code(registerUser(db, { username: "alice", password: "x" }))).toBe("invite_required");
  });

  test("only hashes are stored for invites and app tokens", async () => {
    const db = getDb();
    const u = await registerUser(db, { username: "alice", password: "x" });
    const inv = await createInvite(db, u.id);
    const { token } = await createAppToken(db, u.id, "cli", ["read"]);
    const invRow = await db.k.selectFrom("invites").selectAll().executeTakeFirstOrThrow();
    const tokRow = await db.k.selectFrom("app_tokens").selectAll().executeTakeFirstOrThrow();
    expect(invRow.code_hash).not.toBe(inv);
    expect(tokRow.token_hash).not.toBe(token);
    expect(tokRow.token_hash).not.toContain(token);
  });

  test("revoking with another user's id leaves the token valid", async () => {
    const db = getDb();
    const a = await registerUser(db, { username: "alice", password: "x" });
    const b = await registerUser(db, {
      username: "bob",
      password: "x",
      inviteCode: await createInvite(db, a.id),
    });
    const { id, token } = await createAppToken(db, a.id, "cli", ["read"]);
    await revokeAppToken(db, b.id, id);
    expect(await verifyAppToken(db, token, "read")).toEqual(a);
  });
});