"""
Tests for BATON-FIX-012: UUID v4 validation regression guard.

BATON-SEC-005 added UUID v4 pattern validation to RegisterRequest.uuid and
SignalRequest.user_id.  Tests in test_db.py / test_baton_005.py / test_telegram.py
previously used placeholder strings ('uuid-001', 'create-uuid-001', 'agg-uuid-001')
that are not valid UUID v4 — causing 25 regressions.

This file locks down the behaviour so the same mistake cannot recur silently:
  - Old-style placeholder strings are rejected by Pydantic
  - All UUID constants used across the fixed test files are valid UUID v4
  - RegisterRequest and SignalRequest accept exactly-valid v4 UUIDs
  - They reject strings that violate version (bit 3 of field-3 must be 4) or
    variant (top bits of field-4 must be 10xx) requirements
"""
from __future__ import annotations

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")

import pytest
from pydantic import ValidationError

from backend.models import RegisterRequest, SignalRequest

# ---------------------------------------------------------------------------
# UUID constants from fixed test files — all must be valid UUID v4
# ---------------------------------------------------------------------------

# test_db.py constants (_UUID_DB_1 .. _UUID_DB_6)
_DB_UUIDS = [
    "d0000001-0000-4000-8000-000000000001",
    "d0000002-0000-4000-8000-000000000002",
    "d0000003-0000-4000-8000-000000000003",
    "d0000004-0000-4000-8000-000000000004",
    "d0000005-0000-4000-8000-000000000005",
    "d0000006-0000-4000-8000-000000000006",
]

# test_baton_005.py constants (_UUID_ADM_*)
_ADM_UUIDS = [
    "e0000000-0000-4000-8000-000000000000",
    "e0000001-0000-4000-8000-000000000001",
    "e0000002-0000-4000-8000-000000000002",
    "e0000003-0000-4000-8000-000000000003",
    "e0000004-0000-4000-8000-000000000004",
    "e0000005-0000-4000-8000-000000000005",
    "e0000006-0000-4000-8000-000000000006",
    "e0000007-0000-4000-8000-000000000007",
    "e0000008-0000-4000-8000-000000000008",
    "e0000009-0000-4000-8000-000000000009",
    "e000000a-0000-4000-8000-000000000010",
]

# test_telegram.py constants (aggregator UUIDs)
_AGG_UUIDS = [
    "a9900001-0000-4000-8000-000000000001",
    "a9900099-0000-4000-8000-000000000099",
] + [f"a990000{i}-0000-4000-8000-00000000000{i}" for i in range(5)]


# ---------------------------------------------------------------------------
# Old-style placeholder UUIDs (pre-fix) must be rejected
# ---------------------------------------------------------------------------


@pytest.mark.parametrize("bad_uuid", [
    "uuid-001",
    "uuid-002",
    "uuid-003",
    "uuid-004",
    "uuid-005",
    "uuid-006",
    "create-uuid-001",
    "create-uuid-002",
    "create-uuid-003",
    "pass-uuid-001",
    "pass-uuid-002",
    "block-uuid-001",
    "unblock-uuid-001",
    "delete-uuid-001",
    "delete-uuid-002",
    "regress-admin-uuid-001",
    "unauth-uuid-001",
    "agg-uuid-001",
    "agg-uuid-clr",
])
def test_register_request_rejects_old_placeholder_uuid(bad_uuid: str) -> None:
    """RegisterRequest.uuid must reject all pre-BATON-SEC-005 placeholder strings."""
    with pytest.raises(ValidationError):
        RegisterRequest(uuid=bad_uuid, name="Test")


@pytest.mark.parametrize("bad_uuid", [
    "uuid-001",
    "agg-uuid-001",
    "create-uuid-001",
])
def test_signal_request_accepts_any_user_id_string(bad_uuid: str) -> None:
    """SignalRequest.user_id is optional (no pattern) — validation is at endpoint level."""
    req = SignalRequest(user_id=bad_uuid, timestamp=1700000000000)
    assert req.user_id == bad_uuid


# ---------------------------------------------------------------------------
# All UUID constants from the fixed test files are valid UUID v4
# ---------------------------------------------------------------------------


@pytest.mark.parametrize("valid_uuid", _DB_UUIDS)
def test_register_request_accepts_db_uuid_constants(valid_uuid: str) -> None:
    """RegisterRequest accepts all _UUID_DB_* constants from test_db.py."""
    req = RegisterRequest(uuid=valid_uuid, name="Test")
    assert req.uuid == valid_uuid


@pytest.mark.parametrize("valid_uuid", _ADM_UUIDS)
def test_register_request_accepts_adm_uuid_constants(valid_uuid: str) -> None:
    """RegisterRequest accepts all _UUID_ADM_* constants from test_baton_005.py."""
    req = RegisterRequest(uuid=valid_uuid, name="Test")
    assert req.uuid == valid_uuid


@pytest.mark.parametrize("valid_uuid", _AGG_UUIDS)
def test_signal_request_accepts_agg_uuid_constants(valid_uuid: str) -> None:
    """SignalRequest accepts all aggregator UUID constants from test_telegram.py."""
    req = SignalRequest(user_id=valid_uuid, timestamp=1700000000000)
    assert req.user_id == valid_uuid


# ---------------------------------------------------------------------------
# UUID v4 structural requirements — version digit and variant bits
# ---------------------------------------------------------------------------


def test_register_request_rejects_uuid_v1_version_digit() -> None:
    """UUID with version digit = 1 (not 4) must be rejected by RegisterRequest."""
    with pytest.raises(ValidationError):
        # third group starts with '1' — version 1, not v4
        RegisterRequest(uuid="550e8400-e29b-11d4-a716-446655440000", name="Test")


def test_register_request_rejects_uuid_v3_version_digit() -> None:
    """UUID with version digit = 3 must be rejected."""
    with pytest.raises(ValidationError):
        RegisterRequest(uuid="550e8400-e29b-31d4-a716-446655440000", name="Test")


def test_signal_request_accepts_any_variant_bits() -> None:
    """SignalRequest.user_id is now optional and unvalidated (JWT auth doesn't use it)."""
    req = SignalRequest(user_id="550e8400-e29b-41d4-0716-446655440000", timestamp=1700000000000)
    assert req.user_id is not None


def test_signal_request_without_user_id() -> None:
    """SignalRequest works without user_id (JWT auth mode)."""
    req = SignalRequest(timestamp=1700000000000)
    assert req.user_id is None


def test_register_request_accepts_all_valid_v4_variants() -> None:
    """RegisterRequest accepts UUIDs with variant nibbles 8, 9, a, b."""
    for variant in ("8", "9", "a", "b"):
        uuid = f"550e8400-e29b-41d4-{variant}716-446655440000"
        req = RegisterRequest(uuid=uuid, name="Test")
        assert req.uuid == uuid