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"""
Integration tests for the Hub API.
Uses SQLite in-memory + httpx.AsyncClient — no PostgreSQL, no network.
"""

import base64
import pytest
import pytest_asyncio
from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
from cryptography.hazmat.primitives import serialization

from meshbay_common.crypto import generate_gek, pk_to_b64, wrap_gek


def _gen_user_keys():
    sk_ed = Ed25519PrivateKey.generate()
    sk_x  = X25519PrivateKey.generate()
    return (
        pk_to_b64(sk_ed.public_key()),
        pk_to_b64(sk_x.public_key()),
        sk_x,
    )


# ── Hub info ──────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_hub_info(client):
    r = await client.get("/v1/hub/info")
    assert r.status_code == 200
    data = r.json()
    assert "mnp_version" in data
    assert "mhp_version" in data


@pytest.mark.asyncio
async def test_hub_pubkey(client):
    r = await client.get("/v1/hub/pubkey")
    assert r.status_code == 200
    pem = r.json()["pk_hub_pem"]
    assert pem.startswith("-----BEGIN PUBLIC KEY-----")


# ── Users ─────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_register_and_login(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    r = await client.post("/v1/users/register", json={
        "username": "alice", "email": "alice@example.com",
        "password": "alicepass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x,
    })
    assert r.status_code == 201
    assert "user_id" in r.json()

    r = await client.post("/v1/users/login", json={
        "username": "alice", "password": "alicepass99"})
    assert r.status_code == 200
    data = r.json()
    assert "access_token" in data
    assert "refresh_token" in data
    assert data["token_type"] == "bearer"


@pytest.mark.asyncio
async def test_register_duplicate_rejected(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    body = {"username": "bob", "email": "bob@example.com",
            "password": "bobpass99",
            "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x}
    await client.post("/v1/users/register", json=body)
    r = await client.post("/v1/users/register", json=body)
    assert r.status_code == 409


@pytest.mark.asyncio
async def test_wrong_password_rejected(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    await client.post("/v1/users/register", json={
        "username": "carol", "email": "carol@example.com",
        "password": "carolpass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})
    r = await client.post("/v1/users/login", json={
        "username": "carol", "password": "wrongpass"})
    assert r.status_code == 401


@pytest.mark.asyncio
async def test_jwt_offline_verify(client, hub_key_path):
    """JWT returned by login must be verifiable offline with hub's public key."""
    import jwt as pyjwt
    pk_ed, pk_x, _ = _gen_user_keys()
    await client.post("/v1/users/register", json={
        "username": "dave", "email": "dave@example.com",
        "password": "davepass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})
    r = await client.post("/v1/users/login", json={
        "username": "dave", "password": "davepass99"})
    token = r.json()["access_token"]

    r_pk = await client.get("/v1/hub/pubkey")
    hub_pk_pem = r_pk.json()["pk_hub_pem"].encode()

    decoded = pyjwt.decode(token, hub_pk_pem, algorithms=["EdDSA"])
    assert decoded["pk_user"] == pk_ed
    assert "jti" in decoded   # mandatory


@pytest.mark.asyncio
async def test_token_refresh(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    await client.post("/v1/users/register", json={
        "username": "eve", "email": "eve@example.com",
        "password": "evepass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})
    r = await client.post("/v1/users/login", json={
        "username": "eve", "password": "evepass99"})
    rt = r.json()["refresh_token"]
    at = r.json()["access_token"]

    r2 = await client.post("/v1/users/token/refresh", json={"refresh_token": rt})
    assert r2.status_code == 200
    assert r2.json()["access_token"] != at   # new token (different jti)


@pytest.mark.asyncio
async def test_get_user_pubkeys(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    await client.post("/v1/users/register", json={
        "username": "frank", "email": "frank@example.com",
        "password": "frankpass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})
    login = await client.post("/v1/users/login", json={
        "username": "frank", "password": "frankpass99"})
    token = login.json()["access_token"]

    r = await client.get("/v1/users/frank/pubkeys",
                         headers={"Authorization": f"Bearer {token}"})
    assert r.status_code == 200
    assert r.json()["pk_ed25519"] == pk_ed
    assert r.json()["pk_x25519"]  == pk_x


# ── Nodes ─────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_announce_and_get_node(client):
    pk_ed, pk_x, _ = _gen_user_keys()
    await client.post("/v1/users/register", json={
        "username": "node1", "email": "n@example.com",
        "password": "nodepass99",
        "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})
    login = await client.post("/v1/users/login", json={
        "username": "node1", "password": "nodepass99"})
    token = login.json()["access_token"]
    hdrs = {"Authorization": f"Bearer {token}"}

    r = await client.post("/v1/nodes/announce",
                          json={"pk_node": pk_ed, "endpoint_hint": "1.2.3.4:19000"},
                          headers=hdrs)
    assert r.status_code == 201
    node_id = r.json()["node_id"]

    r2 = await client.get(f"/v1/nodes/{node_id}", headers=hdrs)
    assert r2.status_code == 200
    assert r2.json()["pk_node"] == pk_ed
    assert r2.json()["endpoint_hint"] == "1.2.3.4:19000"


# ── Groups + GEK bundles ──────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_group_gek_roundtrip(client):
    """Admin creates group, wraps GEK for member, member retrieves and can unwrap."""
    import jwt as pyjwt
    from meshbay_common.crypto import unwrap_gek

    # Register admin (alice2) and member (bob2)
    pk_ed_a, pk_x_a, _ = _gen_user_keys()
    pk_ed_b, pk_x_b, sk_x_b = _gen_user_keys()

    for uname, email, pwd, pk_ed, pk_x in [
        ("alice2", "a2@x.com", "alicepass99", pk_ed_a, pk_x_a),
        ("bob2",   "b2@x.com", "bobpass99",   pk_ed_b, pk_x_b),
    ]:
        await client.post("/v1/users/register", json={
            "username": uname, "email": email, "password": pwd,
            "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})

    def _token(uname, pwd):
        async def _inner():
            r = await client.post("/v1/users/login",
                                  json={"username": uname, "password": pwd})
            return r.json()["access_token"]
        return _inner

    alice_token = (await client.post("/v1/users/login",
                   json={"username": "alice2", "password": "alicepass99"})).json()["access_token"]
    bob_token   = (await client.post("/v1/users/login",
                   json={"username": "bob2",   "password": "bobpass99"})).json()["access_token"]

    a_hdrs = {"Authorization": f"Bearer {alice_token}"}
    b_hdrs = {"Authorization": f"Bearer {bob_token}"}

    # Alice creates group
    r = await client.post("/v1/groups", json={"name": "mygroup"}, headers=a_hdrs)
    assert r.status_code == 201
    group_id = r.json()["group_id"]

    # Alice generates GEK and wraps it for bob
    gek = generate_gek()
    pk_bob_raw = base64.b64decode(pk_x_b)
    bundle = wrap_gek(gek, pk_bob_raw)

    r = await client.post(f"/v1/groups/{group_id}/members/bob2/gek",
                          json=bundle, headers=a_hdrs)
    assert r.status_code == 201

    # Bob retrieves his bundle
    r = await client.get(f"/v1/groups/{group_id}/gek", headers=b_hdrs)
    assert r.status_code == 200
    retrieved = r.json()

    # Bob unwraps — must recover original GEK
    sk_b_raw = sk_x_b.private_bytes(
        serialization.Encoding.Raw, serialization.PrivateFormat.Raw,
        serialization.NoEncryption())
    recovered = unwrap_gek(retrieved, sk_b_raw, pk_bob_raw)
    assert recovered == gek


@pytest.mark.asyncio
async def test_non_admin_cannot_add_member(client):
    pk_ed_a, pk_x_a, _ = _gen_user_keys()
    pk_ed_b, pk_x_b, _ = _gen_user_keys()

    for uname, email, pwd, pk_ed, pk_x in [
        ("charlie", "c@x.com", "charliepass", pk_ed_a, pk_x_a),
        ("dan",     "d@x.com", "danpass1234", pk_ed_b, pk_x_b),
    ]:
        await client.post("/v1/users/register", json={
            "username": uname, "email": email, "password": pwd,
            "pk_user_ed25519": pk_ed, "pk_user_x25519": pk_x})

    charlie_token = (await client.post("/v1/users/login",
                     json={"username": "charlie", "password": "charliepass"})).json()["access_token"]
    dan_token     = (await client.post("/v1/users/login",
                     json={"username": "dan", "password": "danpass1234"})).json()["access_token"]

    r = await client.post("/v1/groups", json={"name": "charlies-group"},
                          headers={"Authorization": f"Bearer {charlie_token}"})
    group_id = r.json()["group_id"]

    gek = generate_gek()
    bundle = wrap_gek(gek, base64.b64decode(pk_x_b))

    # Dan (non-admin) tries to add a member → 403
    r = await client.post(f"/v1/groups/{group_id}/members/charlie/gek",
                          json=bundle,
                          headers={"Authorization": f"Bearer {dan_token}"})
    assert r.status_code == 403