from datetime import UTC, datetime

import pytest

from tenant_engine.domain import CapabilityRole, PlanAssignment, Tenant, create_role_grant
from tenant_engine.store import (
    GrantNotFoundError,
    InMemoryTenantStore,
    TenantAlreadyExistsError,
    TenantNotFoundError,
)


def _store_with_tenant(
    *, grouping: str = "friendly", name: str = "binky"
) -> tuple[InMemoryTenantStore, Tenant]:
    store = InMemoryTenantStore()
    tenant = Tenant.create(tenant_id=f"t-{name}", identifier=f"tenant:{grouping}:{name}")
    store.create_tenant(tenant)
    return store, tenant


def test_create_and_get_tenant() -> None:
    store, tenant = _store_with_tenant()
    assert store.get_tenant(tenant.tenant_id) == tenant


def test_create_duplicate_tenant_raises() -> None:
    store, tenant = _store_with_tenant()
    with pytest.raises(TenantAlreadyExistsError):
        store.create_tenant(tenant)


def test_get_unknown_tenant_raises() -> None:
    store = InMemoryTenantStore()
    with pytest.raises(TenantNotFoundError):
        store.get_tenant("does-not-exist")


def test_grant_and_active_roles() -> None:
    store, tenant = _store_with_tenant()
    grant = create_role_grant(
        tenant=tenant,
        grant_id="g-1",
        role=CapabilityRole.CUS,
        grant_reason="manual_grant",
        plan_id=None,
        granted_by="ops",
        correlation_id="corr-1",
        granted_at=datetime.now(UTC),
    )
    store.grant_role(grant)

    assert store.active_roles(tenant.tenant_id) == frozenset({CapabilityRole.CUS})


def test_revoke_removes_role_from_active_set_but_keeps_record() -> None:
    store, tenant = _store_with_tenant()
    grant = create_role_grant(
        tenant=tenant,
        grant_id="g-1",
        role=CapabilityRole.VEN,
        grant_reason="manual_grant",
        plan_id=None,
        granted_by="ops",
        correlation_id="corr-1",
        granted_at=datetime.now(UTC),
    )
    store.grant_role(grant)
    revoked = store.revoke_role(tenant_id=tenant.tenant_id, grant_id="g-1", at=datetime.now(UTC))

    assert revoked.revoked_at is not None
    assert store.active_roles(tenant.tenant_id) == frozenset()


def test_revoke_unknown_grant_raises() -> None:
    store, tenant = _store_with_tenant()
    with pytest.raises(GrantNotFoundError):
        store.revoke_role(tenant_id=tenant.tenant_id, grant_id="missing", at=datetime.now(UTC))


def test_non_exclusive_roles_coexist() -> None:
    store, tenant = _store_with_tenant()
    for role in (CapabilityRole.CUS, CapabilityRole.VEN):
        store.grant_role(
            create_role_grant(
                tenant=tenant,
                grant_id=f"g-{role.value}",
                role=role,
                grant_reason="manual_grant",
                plan_id=None,
                granted_by="ops",
                correlation_id="corr-1",
                granted_at=datetime.now(UTC),
            )
        )

    assert store.active_roles(tenant.tenant_id) == frozenset(
        {CapabilityRole.CUS, CapabilityRole.VEN}
    )


def test_assign_plan() -> None:
    store, tenant = _store_with_tenant()
    store.assign_plan(
        PlanAssignment(tenant_id=tenant.tenant_id, plan_id="plan-x", assigned_at=datetime.now(UTC))
    )

    events = store.events_for(tenant.tenant_id)
    assert any(
        event.event_type == "plan_assigned" and event.payload["plan_id"] == "plan-x"
        for event in events
    )


def test_get_tenant_resolves_by_identifier_not_only_internal_id() -> None:
    """Found via a real cross-service check (KEY-WP-0005-T02 against a live

    tenant-engine): external callers like key-cape and flex-auth only ever
    have the tenant's profile identifier (the IAM Profile `tenant` claim
    value), never its internal tenant_id, which is caller-chosen at
    creation and otherwise opaque.
    """
    store, tenant = _store_with_tenant()

    by_internal_id = store.get_tenant(tenant.tenant_id)
    by_identifier = store.get_tenant(tenant.identifier)

    assert by_internal_id == by_identifier == tenant


def test_active_roles_resolves_by_identifier() -> None:
    store, tenant = _store_with_tenant()
    store.grant_role(
        create_role_grant(
            tenant=tenant,
            grant_id="g-1",
            role=CapabilityRole.CUS,
            grant_reason="manual_grant",
            plan_id=None,
            granted_by="ops",
            correlation_id="corr-1",
            granted_at=datetime.now(UTC),
        )
    )

    assert store.active_roles(tenant.identifier) == frozenset({CapabilityRole.CUS})


def test_revoke_role_resolves_by_identifier() -> None:
    store, tenant = _store_with_tenant()
    store.grant_role(
        create_role_grant(
            tenant=tenant,
            grant_id="g-1",
            role=CapabilityRole.CUS,
            grant_reason="manual_grant",
            plan_id=None,
            granted_by="ops",
            correlation_id="corr-1",
            granted_at=datetime.now(UTC),
        )
    )

    revoked = store.revoke_role(tenant_id=tenant.identifier, grant_id="g-1", at=datetime.now(UTC))

    assert revoked.revoked_at is not None
    assert store.active_roles(tenant.tenant_id) == frozenset()


def test_create_tenant_rejects_duplicate_identifier_with_different_internal_id() -> None:
    store, tenant = _store_with_tenant()
    other = Tenant.create(tenant_id="a-different-internal-id", identifier=tenant.identifier)

    with pytest.raises(TenantAlreadyExistsError):
        store.create_tenant(other)


def test_every_mutation_emits_an_event() -> None:
    store, tenant = _store_with_tenant()
    grant = create_role_grant(
        tenant=tenant,
        grant_id="g-1",
        role=CapabilityRole.CUS,
        grant_reason="manual_grant",
        plan_id=None,
        granted_by="ops",
        correlation_id="corr-1",
        granted_at=datetime.now(UTC),
    )
    store.grant_role(grant)
    store.revoke_role(tenant_id=tenant.tenant_id, grant_id="g-1", at=datetime.now(UTC))
    store.assign_plan(
        PlanAssignment(tenant_id=tenant.tenant_id, plan_id="plan-x", assigned_at=datetime.now(UTC))
    )

    event_types = [event.event_type for event in store.events_for(tenant.tenant_id)]
    assert event_types == ["tenant_created", "role_granted", "role_revoked", "plan_assigned"]