"""Unit tests for app.core.security helpers."""

from __future__ import annotations

import hashlib
import os
from datetime import UTC, datetime, timedelta
from uuid import UUID, uuid4

import pytest
from jose import JWTError

os.environ.setdefault("DATABASE_URL", "postgresql://test:test@localhost/testdb")
os.environ.setdefault("JWT_SECRET_KEY", "test-secret-key")

from app.config import settings  # noqa: E402  (env must be set before importing)
from app.core import security  # noqa: E402


def test_hash_password_roundtrip() -> None:
    password = "SuperStrong!123"
    hashed = security.hash_password(password)

    assert hashed
    assert hashed != password
    assert security.verify_password(password, hashed)
    assert not security.verify_password("wrong-password", hashed)


def test_create_access_token_includes_required_claims_per_specs(monkeypatch: pytest.MonkeyPatch) -> None:
    """Ensure JWT claims stay aligned with SPECS.md section 2."""

    monkeypatch.setattr(settings, "access_token_expire_minutes", 15)
    user_id = str(uuid4())
    org_id = str(uuid4())

    token = security.create_access_token(sub=user_id, org_id=org_id, org_role="member")
    payload = security.decode_access_token(token)

    # Required claims per SPECS.md
    assert payload["sub"] == user_id
    assert payload["org_id"] == org_id
    assert payload["org_role"] == "member"

    # Standard JWT claims
    assert payload["iss"] == settings.jwt_issuer
    assert payload["aud"] == settings.jwt_audience
    assert "jti" in payload
    UUID(payload["jti"])  # Should be valid UUID

    assert abs(payload["exp"] - payload["iat"] - 15 * 60) <= 1


def test_create_access_token_honors_custom_expiry() -> None:
    user_id = str(uuid4())
    org_id = str(uuid4())
    ttl = timedelta(hours=2)

    token = security.create_access_token(
        sub=user_id,
        org_id=org_id,
        org_role="admin",
        expires_delta=ttl,
    )
    payload = security.decode_access_token(token)

    assert abs(payload["exp"] - payload["iat"] - int(ttl.total_seconds())) <= 1


def test_decode_access_token_rejects_tampered_signature() -> None:
    token = security.create_access_token(sub=str(uuid4()), org_id=str(uuid4()), org_role="viewer")
    tampered = token[:-1] + ("A" if token[-1] != "A" else "B")

    with pytest.raises(JWTError):
        security.decode_access_token(tampered)


def test_decode_access_token_rejects_expired_token() -> None:
    token = security.create_access_token(
        sub=str(uuid4()),
        org_id=str(uuid4()),
        org_role="viewer",
        expires_delta=timedelta(seconds=-5),
    )

    with pytest.raises(JWTError):
        security.decode_access_token(token)


def test_decode_access_token_rejects_wrong_issuer(monkeypatch: pytest.MonkeyPatch) -> None:
    """Token created with different issuer should be rejected."""
    from jose import jwt as jose_jwt

    payload = {
        "sub": str(uuid4()),
        "org_id": str(uuid4()),
        "org_role": "viewer",
        "iss": "wrong-issuer",
        "aud": settings.jwt_audience,
        "jti": str(uuid4()),
        "iat": datetime.now(UTC),
        "exp": datetime.now(UTC) + timedelta(minutes=15),
    }
    token = jose_jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)

    with pytest.raises(JWTError):
        security.decode_access_token(token)


def test_decode_access_token_rejects_wrong_audience(monkeypatch: pytest.MonkeyPatch) -> None:
    """Token created with different audience should be rejected."""
    from jose import jwt as jose_jwt

    payload = {
        "sub": str(uuid4()),
        "org_id": str(uuid4()),
        "org_role": "viewer",
        "iss": settings.jwt_issuer,
        "aud": "wrong-audience",
        "jti": str(uuid4()),
        "iat": datetime.now(UTC),
        "exp": datetime.now(UTC) + timedelta(minutes=15),
    }
    token = jose_jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)

    with pytest.raises(JWTError):
        security.decode_access_token(token)


def test_create_access_token_generates_unique_jti() -> None:
    """Each token should have a unique jti claim."""
    token1 = security.create_access_token(sub=str(uuid4()), org_id=str(uuid4()), org_role="viewer")
    token2 = security.create_access_token(sub=str(uuid4()), org_id=str(uuid4()), org_role="viewer")

    payload1 = security.decode_access_token(token1)
    payload2 = security.decode_access_token(token2)

    assert payload1["jti"] != payload2["jti"]


def test_generate_refresh_token_is_random_and_urlsafe() -> None:
    token_one = security.generate_refresh_token()
    token_two = security.generate_refresh_token()

    assert token_one != token_two
    assert len(token_one) >= 43
    allowed_chars = set("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_")
    assert set(token_one).issubset(allowed_chars)
    assert set(token_two).issubset(allowed_chars)


def test_hash_token_matches_sha256_digest() -> None:
    raw = "refresh-token-value"

    assert security.hash_token(raw) == hashlib.sha256(raw.encode()).hexdigest()


def test_get_refresh_token_expiry_uses_settings(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setattr(settings, "refresh_token_expire_days", 45)
    fixed_now = datetime(2025, 5, 10, 15, 30, tzinfo=UTC)

    class _FixedDateTime:
        @staticmethod
        def now(tz: object | None = None) -> datetime:
            assert tz is security.UTC
            return fixed_now

    monkeypatch.setattr(security, "datetime", _FixedDateTime)

    expiry = security.get_refresh_token_expiry()
    assert expiry == fixed_now + timedelta(days=45)


def test_token_payload_parses_uuid_fields() -> None:
    jti = str(uuid4())
    payload = {
        "sub": str(uuid4()),
        "org_id": str(uuid4()),
        "org_role": "admin",
        "iss": "incidentops",
        "aud": "incidentops-api",
        "jti": jti,
        "iat": 1704067200,
        "exp": 1704068100,
    }

    token_payload = security.TokenPayload(payload)

    assert token_payload.user_id == UUID(payload["sub"])
    assert token_payload.org_id == UUID(payload["org_id"])
    assert token_payload.org_role == "admin"
    assert token_payload.issuer == "incidentops"
    assert token_payload.audience == "incidentops-api"
    assert token_payload.jti == UUID(jti)
    assert token_payload.issued_at == 1704067200
    assert token_payload.expires_at == 1704068100


def test_token_payload_rejects_invalid_uuid() -> None:
    payload = {
        "sub": "not-a-uuid",
        "org_id": str(uuid4()),
        "org_role": "member",
        "iss": "incidentops",
        "aud": "incidentops-api",
        "jti": str(uuid4()),
        "iat": 1704067200,
        "exp": 1704068100,
    }

    with pytest.raises(ValueError):
        security.TokenPayload(payload)


def test_token_payload_rejects_invalid_jti() -> None:
    payload = {
        "sub": str(uuid4()),
        "org_id": str(uuid4()),
        "org_role": "member",
        "iss": "incidentops",
        "aud": "incidentops-api",
        "jti": "not-a-uuid",
        "iat": 1704067200,
        "exp": 1704068100,
    }

    with pytest.raises(ValueError):
        security.TokenPayload(payload)