"""Upserting the env-managed OIDC provider (#2593).

Startup applies BAMBUDDY_OIDC_* to the database. The row is updated in place,
never delete-recreated: user_oidc_links.provider_id is FK ON DELETE CASCADE, so
recreating the provider would silently unlink every account bound to it.
"""

from __future__ import annotations

import pytest
from sqlalchemy import select

from backend.app.core.oidc_env import apply_env_oidc_provider
from backend.app.models.oidc_provider import OIDCProvider

REQUIRED = {
    "BAMBUDDY_OIDC_NAME": "Keycloak",
    "BAMBUDDY_OIDC_ISSUER_URL": "https://sso.example.com/realms/main",
    "BAMBUDDY_OIDC_CLIENT_ID": "bambuddy",
    "BAMBUDDY_OIDC_CLIENT_SECRET": "s3cr3t",
}

ALL_VARS = (
    *REQUIRED,
    "BAMBUDDY_OIDC_SCOPES",
    "BAMBUDDY_OIDC_ENABLED",
    "BAMBUDDY_OIDC_AUTO_CREATE_USERS",
    "BAMBUDDY_OIDC_AUTO_LINK_EXISTING",
    "BAMBUDDY_OIDC_EMAIL_CLAIM",
    "BAMBUDDY_OIDC_REQUIRE_EMAIL_VERIFIED",
    "BAMBUDDY_OIDC_ICON_URL",
    "BAMBUDDY_OIDC_AUTOLOGIN",
)


@pytest.fixture(autouse=True)
def clean_env(monkeypatch):
    for key in ALL_VARS:
        monkeypatch.delenv(key, raising=False)


def _configure(monkeypatch, **overrides):
    for key, value in REQUIRED.items():
        monkeypatch.setenv(key, value)
    for key, value in overrides.items():
        monkeypatch.setenv(key, value)


async def _env_provider(db_session) -> OIDCProvider | None:
    result = await db_session.execute(select(OIDCProvider).where(OIDCProvider.is_env_managed.is_(True)))
    return result.scalar_one_or_none()


@pytest.mark.asyncio
async def test_creates_the_provider_from_env(db_session, monkeypatch):
    _configure(monkeypatch)
    await apply_env_oidc_provider(db_session)

    provider = await _env_provider(db_session)
    assert provider is not None
    assert provider.name == "Keycloak"
    assert provider.client_id == "bambuddy"
    assert provider.is_env_managed is True
    assert provider.client_secret == "s3cr3t"  # property decrypts


@pytest.mark.asyncio
async def test_a_changed_var_updates_the_same_row(db_session, monkeypatch):
    """The id must survive: user_oidc_links references it with ON DELETE
    CASCADE, so a delete-recreate would unlink every bound account."""
    _configure(monkeypatch)
    await apply_env_oidc_provider(db_session)
    original_id = (await _env_provider(db_session)).id

    monkeypatch.setenv("BAMBUDDY_OIDC_CLIENT_ID", "rotated")
    await apply_env_oidc_provider(db_session)

    provider = await _env_provider(db_session)
    assert provider.id == original_id
    assert provider.client_id == "rotated"


@pytest.mark.asyncio
async def test_removing_the_env_config_disables_but_keeps_the_row(db_session, monkeypatch):
    _configure(monkeypatch)
    await apply_env_oidc_provider(db_session)
    original_id = (await _env_provider(db_session)).id

    for key in ALL_VARS:
        monkeypatch.delenv(key, raising=False)
    await apply_env_oidc_provider(db_session)

    provider = await _env_provider(db_session)
    assert provider is not None, "deleting would cascade away every account link"
    assert provider.id == original_id
    assert provider.is_enabled is False


@pytest.mark.asyncio
async def test_env_autologin_clears_it_on_other_providers(db_session, monkeypatch):
    """Only one provider may be the autologin target; the env one wins."""
    ui_provider = OIDCProvider(
        name="UI provider",
        issuer_url="https://other.example.com",
        client_id="ui",
        is_autologin=True,
    )
    ui_provider.client_secret = "ui-secret"
    db_session.add(ui_provider)
    await db_session.commit()

    _configure(monkeypatch, BAMBUDDY_OIDC_AUTOLOGIN="true")
    await apply_env_oidc_provider(db_session)

    await db_session.refresh(ui_provider)
    assert (await _env_provider(db_session)).is_autologin is True
    assert ui_provider.is_autologin is False


@pytest.mark.asyncio
async def test_a_ui_provider_is_otherwise_left_alone(db_session, monkeypatch):
    ui_provider = OIDCProvider(name="UI provider", issuer_url="https://other.example.com", client_id="ui")
    ui_provider.client_secret = "ui-secret"
    db_session.add(ui_provider)
    await db_session.commit()

    _configure(monkeypatch)
    await apply_env_oidc_provider(db_session)

    await db_session.refresh(ui_provider)
    assert ui_provider.is_env_managed is False
    assert ui_provider.is_enabled is True
    assert ui_provider.client_id == "ui"


@pytest.mark.asyncio
async def test_an_unsafe_auto_link_config_is_skipped_not_raised(db_session, monkeypatch):
    """auto-link + unverified email is the SEC-1 account-takeover shape. The
    schema rejects it for the UI, and env config must not be a way around that
    -- but a bad variable must not stop the app from booting either."""
    _configure(
        monkeypatch,
        BAMBUDDY_OIDC_AUTO_LINK_EXISTING="true",
        BAMBUDDY_OIDC_REQUIRE_EMAIL_VERIFIED="false",
    )

    await apply_env_oidc_provider(db_session)

    assert await _env_provider(db_session) is None


@pytest.mark.asyncio
async def test_applying_twice_without_changes_is_a_no_op(db_session, monkeypatch):
    """Every boot re-applies; the second run must not create a second row."""
    _configure(monkeypatch)
    await apply_env_oidc_provider(db_session)
    await apply_env_oidc_provider(db_session)

    result = await db_session.execute(select(OIDCProvider).where(OIDCProvider.is_env_managed.is_(True)))
    assert len(result.scalars().all()) == 1