"""
Tests for BATON-008: Registration flow with Telegram admin approval.

Acceptance criteria:
1. POST /api/auth/register returns 201 with status='pending' on valid input
2. POST /api/auth/register returns 409 on email or login conflict
3. POST /api/auth/register returns 422 on invalid email/login/password
4. Telegram notification is fire-and-forget — 201 is returned even if Telegram fails
5. Webhook callback_query approve → db status='approved', push task fired if subscription present
6. Webhook callback_query reject → db status='rejected'
7. Webhook callback_query with unknown reg_id → returns {"ok": True} gracefully
"""
from __future__ import annotations

import asyncio
import os

os.environ.setdefault("BOT_TOKEN", "test-bot-token")
os.environ.setdefault("CHAT_ID", "-1001234567890")
os.environ.setdefault("WEBHOOK_SECRET", "test-webhook-secret")
os.environ.setdefault("WEBHOOK_URL", "https://example.com/api/webhook/telegram")
os.environ.setdefault("FRONTEND_ORIGIN", "http://localhost:3000")
os.environ.setdefault("ADMIN_TOKEN", "test-admin-token")

from unittest.mock import AsyncMock, patch

import pytest

from tests.conftest import make_app_client

_WEBHOOK_SECRET = "test-webhook-secret"
_WEBHOOK_HEADERS = {"X-Telegram-Bot-Api-Secret-Token": _WEBHOOK_SECRET}

_VALID_PAYLOAD = {
    "email": "user@example.com",
    "login": "testuser",
    "password": "strongpassword123",
}


# ---------------------------------------------------------------------------
# 1. Happy path — 201
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_auth_register_returns_201_pending():
    """Valid registration request returns 201 with status='pending'."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)

    assert resp.status_code == 201, f"Expected 201, got {resp.status_code}: {resp.text}"
    body = resp.json()
    assert body["status"] == "pending"
    assert "message" in body


@pytest.mark.asyncio
async def test_auth_register_fire_and_forget_telegram_error_still_returns_201():
    """Telegram failure must not break 201 — fire-and-forget pattern."""
    async with make_app_client() as client:
        with patch(
            "backend.telegram.send_registration_notification",
            new_callable=AsyncMock,
            side_effect=Exception("Telegram down"),
        ):
            resp = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "other@example.com", "login": "otheruser"},
            )
            await asyncio.sleep(0)

    assert resp.status_code == 201, f"Telegram error must not break 201, got {resp.status_code}"


# ---------------------------------------------------------------------------
# 2. Conflict — 409
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_auth_register_409_on_duplicate_email():
    """Duplicate email returns 409."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            r1 = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
            assert r1.status_code == 201, f"First registration failed: {r1.text}"

            r2 = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "login": "differentlogin"},
            )

    assert r2.status_code == 409, f"Expected 409 on duplicate email, got {r2.status_code}"


@pytest.mark.asyncio
async def test_auth_register_409_on_duplicate_login():
    """Duplicate login returns 409."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            r1 = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
            assert r1.status_code == 201, f"First registration failed: {r1.text}"

            r2 = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "different@example.com"},
            )

    assert r2.status_code == 409, f"Expected 409 on duplicate login, got {r2.status_code}"


# ---------------------------------------------------------------------------
# 3. Validation — 422
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_auth_register_422_invalid_email():
    """Invalid email format returns 422."""
    async with make_app_client() as client:
        resp = await client.post(
            "/api/auth/register",
            json={**_VALID_PAYLOAD, "email": "not-an-email"},
        )
    assert resp.status_code == 422, f"Expected 422 on invalid email, got {resp.status_code}"


@pytest.mark.asyncio
async def test_auth_register_422_short_login():
    """Login shorter than 3 chars returns 422."""
    async with make_app_client() as client:
        resp = await client.post(
            "/api/auth/register",
            json={**_VALID_PAYLOAD, "login": "ab"},
        )
    assert resp.status_code == 422, f"Expected 422 on short login, got {resp.status_code}"


@pytest.mark.asyncio
async def test_auth_register_422_login_invalid_chars():
    """Login with spaces/special chars returns 422."""
    async with make_app_client() as client:
        resp = await client.post(
            "/api/auth/register",
            json={**_VALID_PAYLOAD, "login": "invalid login!"},
        )
    assert resp.status_code == 422, f"Expected 422 on login with spaces, got {resp.status_code}"


@pytest.mark.asyncio
async def test_auth_register_422_short_password():
    """Password shorter than 8 chars returns 422."""
    async with make_app_client() as client:
        resp = await client.post(
            "/api/auth/register",
            json={**_VALID_PAYLOAD, "password": "short"},
        )
    assert resp.status_code == 422, f"Expected 422 on short password, got {resp.status_code}"


# ---------------------------------------------------------------------------
# 4. Telegram notification is sent to ADMIN_CHAT_ID
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_auth_register_sends_notification_to_admin():
    """Registration triggers send_registration_notification with correct data."""
    calls: list[dict] = []

    async def _capture(reg_id, login, email, created_at):
        calls.append({"reg_id": reg_id, "login": login, "email": email})

    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", side_effect=_capture):
            await client.post("/api/auth/register", json=_VALID_PAYLOAD)
            await asyncio.sleep(0)

    assert len(calls) == 1, f"Expected 1 notification call, got {len(calls)}"
    assert calls[0]["login"] == _VALID_PAYLOAD["login"]
    assert calls[0]["email"] == _VALID_PAYLOAD["email"]


# ---------------------------------------------------------------------------
# 5. Webhook callback_query — approve
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_approve_updates_db_status():
    """approve callback updates registration status to 'approved' in DB."""
    from backend import db as _db

    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
        assert reg_resp.status_code == 201

        # We need reg_id — get it from DB directly
        reg_id = None
        from tests.conftest import temp_db as _temp_db  # noqa: F401 — already active
        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None

        assert reg_id is not None, "Registration not found in DB"

        cb_payload = {
            "callback_query": {
                "id": "cq_001",
                "data": f"approve:{reg_id}",
                "message": {
                    "message_id": 42,
                    "chat": {"id": 5694335584},
                },
            }
        }
        resp = await client.post(
            "/api/webhook/telegram",
            json=cb_payload,
            headers=_WEBHOOK_HEADERS,
        )
        await asyncio.sleep(0)

        assert resp.status_code == 200
        assert resp.json() == {"ok": True}

        # Verify DB status updated
        reg = await _db.get_registration(reg_id)
        assert reg is not None
        assert reg["status"] == "approved", f"Expected status='approved', got {reg['status']!r}"


@pytest.mark.asyncio
async def test_webhook_callback_approve_fires_push_when_subscription_present():
    """approve callback triggers send_push when push_subscription is set."""
    push_sub = {
        "endpoint": "https://fcm.googleapis.com/fcm/send/test",
        "keys": {"p256dh": "BQABC", "auth": "xyz"},
    }

    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "push_subscription": push_sub},
            )
        assert reg_resp.status_code == 201

        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None
        assert reg_id is not None

        cb_payload = {
            "callback_query": {
                "id": "cq_002",
                "data": f"approve:{reg_id}",
                "message": {"message_id": 43, "chat": {"id": 5694335584}},
            }
        }
        push_calls: list = []

        async def _capture_push(sub_json, title, body):
            push_calls.append(sub_json)

        with patch("backend.push.send_push", side_effect=_capture_push):
            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
            await asyncio.sleep(0)

    assert len(push_calls) == 1, f"Expected 1 push call, got {len(push_calls)}"


# ---------------------------------------------------------------------------
# 6. Webhook callback_query — reject
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_reject_updates_db_status():
    """reject callback updates registration status to 'rejected' in DB."""
    from backend import db as _db

    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
        assert reg_resp.status_code == 201

        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None
        assert reg_id is not None

        cb_payload = {
            "callback_query": {
                "id": "cq_003",
                "data": f"reject:{reg_id}",
                "message": {"message_id": 44, "chat": {"id": 5694335584}},
            }
        }
        resp = await client.post(
            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
        )
        await asyncio.sleep(0)

        assert resp.status_code == 200

        reg = await _db.get_registration(reg_id)
        assert reg is not None
        assert reg["status"] == "rejected", f"Expected status='rejected', got {reg['status']!r}"


# ---------------------------------------------------------------------------
# 7. Unknown reg_id — graceful handling
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_unknown_reg_id_returns_ok():
    """callback_query with unknown reg_id returns ok without error."""
    async with make_app_client() as client:
        cb_payload = {
            "callback_query": {
                "id": "cq_999",
                "data": "approve:99999",
                "message": {"message_id": 1, "chat": {"id": 5694335584}},
            }
        }
        resp = await client.post(
            "/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS
        )
        await asyncio.sleep(0)

    assert resp.status_code == 200
    assert resp.json() == {"ok": True}


# ---------------------------------------------------------------------------
# 8. Registration without push_subscription
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_register_without_push_subscription():
    """Registration with push_subscription=null returns 201."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            resp = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "nopush@example.com", "login": "nopushuser"},
            )
    assert resp.status_code == 201
    assert resp.json()["status"] == "pending"


# ---------------------------------------------------------------------------
# 9. reject does NOT trigger Web Push
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_reject_does_not_send_push():
    """reject callback does NOT call send_push."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post("/api/auth/register", json=_VALID_PAYLOAD)
        assert reg_resp.status_code == 201

        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None
        assert reg_id is not None

        cb_payload = {
            "callback_query": {
                "id": "cq_r001",
                "data": f"reject:{reg_id}",
                "message": {"message_id": 50, "chat": {"id": 5694335584}},
            }
        }
        push_calls: list = []

        async def _capture_push(sub_json, title, body):
            push_calls.append(sub_json)

        with patch("backend.push.send_push", side_effect=_capture_push):
            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)
            await asyncio.sleep(0)

    assert len(push_calls) == 0, f"Expected 0 push calls on reject, got {len(push_calls)}"


# ---------------------------------------------------------------------------
# 10. approve calls editMessageText with ✅ text
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_approve_edits_message():
    """approve callback calls editMessageText with '✅ Пользователь ... одобрен'."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "edit@example.com", "login": "edituser"},
            )
        assert reg_resp.status_code == 201

        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None
        assert reg_id is not None

        cb_payload = {
            "callback_query": {
                "id": "cq_e001",
                "data": f"approve:{reg_id}",
                "message": {"message_id": 51, "chat": {"id": 5694335584}},
            }
        }
        edit_calls: list[str] = []

        async def _capture_edit(chat_id, message_id, text):
            edit_calls.append(text)

        with patch("backend.telegram.edit_message_text", side_effect=_capture_edit):
            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)

    assert len(edit_calls) == 1, f"Expected 1 editMessageText call, got {len(edit_calls)}"
    assert "✅" in edit_calls[0], f"Expected ✅ in edit text, got: {edit_calls[0]!r}"
    assert "edituser" in edit_calls[0], f"Expected login in edit text, got: {edit_calls[0]!r}"


# ---------------------------------------------------------------------------
# 11. answerCallbackQuery is called after callback processing
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_webhook_callback_answer_sent():
    """answerCallbackQuery is called with the callback_query_id after processing."""
    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            reg_resp = await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "answer@example.com", "login": "answeruser"},
            )
        assert reg_resp.status_code == 201

        from backend import config as _cfg
        import aiosqlite
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute("SELECT id FROM registrations LIMIT 1") as cur:
                row = await cur.fetchone()
                reg_id = row["id"] if row else None
        assert reg_id is not None

        cb_payload = {
            "callback_query": {
                "id": "cq_a001",
                "data": f"approve:{reg_id}",
                "message": {"message_id": 52, "chat": {"id": 5694335584}},
            }
        }
        answer_calls: list[str] = []

        async def _capture_answer(callback_query_id):
            answer_calls.append(callback_query_id)

        with patch("backend.telegram.answer_callback_query", side_effect=_capture_answer):
            await client.post("/api/webhook/telegram", json=cb_payload, headers=_WEBHOOK_HEADERS)

    assert len(answer_calls) == 1, f"Expected 1 answerCallbackQuery call, got {len(answer_calls)}"
    assert answer_calls[0] == "cq_a001"


# ---------------------------------------------------------------------------
# 12. CORS — Authorization header is allowed
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_cors_authorization_header_allowed():
    """CORS preflight request allows Authorization header."""
    async with make_app_client() as client:
        resp = await client.options(
            "/api/auth/register",
            headers={
                "Origin": "http://localhost:3000",
                "Access-Control-Request-Method": "POST",
                "Access-Control-Request-Headers": "Authorization",
            },
        )
    assert resp.status_code in (200, 204), f"CORS preflight returned {resp.status_code}"
    allow_headers = resp.headers.get("access-control-allow-headers", "")
    assert "authorization" in allow_headers.lower(), (
        f"Authorization not in Access-Control-Allow-Headers: {allow_headers!r}"
    )


# ---------------------------------------------------------------------------
# 13. DB — registrations table exists after init_db
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_registrations_table_created():
    """init_db creates the registrations table with correct schema."""
    from tests.conftest import temp_db
    from backend import db as _db, config as _cfg
    import aiosqlite

    with temp_db():
        await _db.init_db()
        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            async with conn.execute(
                "SELECT name FROM sqlite_master WHERE type='table' AND name='registrations'"
            ) as cur:
                row = await cur.fetchone()
        assert row is not None, "Table 'registrations' not found after init_db()"


# ---------------------------------------------------------------------------
# 14. DB — password_hash uses PBKDF2 '{salt_hex}:{dk_hex}' format
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_password_hash_stored_in_pbkdf2_format():
    """Stored password_hash uses '<salt_hex>:<dk_hex>' PBKDF2 format."""
    from backend import config as _cfg
    import aiosqlite

    async with make_app_client() as client:
        with patch("backend.telegram.send_registration_notification", new_callable=AsyncMock):
            await client.post(
                "/api/auth/register",
                json={**_VALID_PAYLOAD, "email": "pbkdf2@example.com", "login": "pbkdf2user"},
            )

        async with aiosqlite.connect(_cfg.DB_PATH) as conn:
            conn.row_factory = aiosqlite.Row
            async with conn.execute(
                "SELECT password_hash FROM registrations WHERE login = 'pbkdf2user'"
            ) as cur:
                row = await cur.fetchone()

    assert row is not None, "Registration not found in DB"
    password_hash = row["password_hash"]
    assert ":" in password_hash, f"Expected 'salt:hash' format, got {password_hash!r}"
    parts = password_hash.split(":")
    assert len(parts) == 2, f"Expected exactly one colon separator, got {password_hash!r}"
    salt_hex, dk_hex = parts
    # salt = os.urandom(16) → 32 hex chars; dk = SHA-256 output (32 bytes) → 64 hex chars
    assert len(salt_hex) == 32, f"Expected 32-char salt hex, got {len(salt_hex)}"
    assert len(dk_hex) == 64, f"Expected 64-char dk hex (SHA-256), got {len(dk_hex)}"
    int(salt_hex, 16)  # raises ValueError if not valid hex
    int(dk_hex, 16)