"""TEN-WP-0011-T04: local outbox and attributive drain to audit-core."""

import json
from datetime import datetime

import httpx
import pytest
from fastapi.testclient import TestClient
from helpers import AllowAllAuthorizer

from tenant_engine.app import create_app
from tenant_engine.audit_core import (
    REQUIRED_FIELDS,
    SOURCE,
    AuditCoreClient,
    EnvelopeError,
    wire_envelope,
)
from tenant_engine.config import Settings
from tenant_engine.domain import Tenant
from tenant_engine.store import InMemoryTenantStore


def test_mutation_enqueues_an_outbox_envelope():
    store = InMemoryTenantStore()
    store.create_tenant(Tenant.create(tenant_id="t-1", identifier="tenant:friendly:binky"))
    pending = store.pending_outbox()
    assert pending
    envelope = pending[0].envelope
    assert envelope["source"] == SOURCE
    assert envelope["tenant"] == "t-1"
    assert envelope["id"]


def test_the_envelope_carries_exactly_the_eight_fields_the_receiver_requires():
    """audit-core `docs/event-envelope.md`: eight fields, all truthy.

    Pinned because the first shipped emitter used its own names -- event_id,
    action, resource, observed_at, details -- and omitted correlation_id
    entirely, which the receiver rejects whole. That mismatch would have
    dead-lettered every event while looking like a working integration.
    """
    store = InMemoryTenantStore()
    store.create_tenant(
        Tenant.create(tenant_id="t-1", identifier="tenant:friendly:binky"),
        correlation_id="corr-1",
    )
    envelope = store.pending_outbox()[0].envelope
    assert set(envelope) == set(REQUIRED_FIELDS)
    assert all(envelope[field] for field in REQUIRED_FIELDS)
    assert envelope["type"] == "tenant_created"
    assert envelope["subject"] == "tenant:t-1"
    assert envelope["correlation_id"] == "corr-1"
    assert envelope["data"]["identifier"] == "tenant:friendly:binky"
    # The receiver derives these; sending them would imply we control them.
    for derived in ("observed_at", "action", "resource", "scope", "outcome", "actor"):
        assert derived not in envelope
    # A naive timestamp is ambiguous by up to a day and is rejected.
    assert datetime.fromisoformat(envelope["occurred_at"]).tzinfo is not None


def test_a_caller_that_supplies_no_correlation_still_produces_a_deliverable_event():
    """The engine names its own operation rather than emitting an undeliverable
    envelope. It observed the mutation; audit-core, which did not, refuses to
    synthesize a correlation and is right to."""
    store = InMemoryTenantStore()
    store.create_tenant(Tenant.create(tenant_id="t-1", identifier="tenant:friendly:binky"))
    envelope = store.pending_outbox()[0].envelope
    assert envelope["correlation_id"]
    # The local record and the emitted one agree about the operation.
    assert store.events_for("t-1")[0].payload["correlation_id"] == envelope["correlation_id"]


def test_the_idempotency_key_header_equals_the_body_id():
    """A mismatch is rejected `idempotency_key_mismatch` by the receiver."""
    seen: list[httpx.Request] = []

    def handler(request: httpx.Request) -> httpx.Response:
        seen.append(request)
        return httpx.Response(202, json={"status": "accepted"})

    client = AuditCoreClient(
        base_url="https://audit-core.example.test", transport=httpx.MockTransport(handler)
    )
    store = InMemoryTenantStore()
    store.create_tenant(Tenant.create(tenant_id="t-1", identifier="tenant:friendly:binky"))
    envelope = store.pending_outbox()[0].envelope
    assert client.post_event(envelope).status == "delivered"
    assert seen[0].headers["Idempotency-Key"] == envelope["id"]
    assert json.loads(seen[0].content)["id"] == envelope["id"]


def test_a_rejected_event_is_retained_rather_than_recorded_as_handled():
    """A 400 means the event is NOT in the archive -- audit-core holds only an
    unchained dead letter. Marking our row handled would lose it on both
    sides, silently. It stays pending, with the reason on the row."""

    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(400, json={"reason": "invalid_event"})

    client = AuditCoreClient(
        base_url="https://audit-core.example.test", transport=httpx.MockTransport(handler)
    )
    store = InMemoryTenantStore()
    store.create_tenant(Tenant.create(tenant_id="t-1", identifier="tenant:friendly:binky"))
    row = store.pending_outbox()[0]
    result = client.post_event(row.envelope)
    assert (result.status, result.http_status) == ("invalid", 400)
    assert "invalid_event" in result.detail

    store.mark_outbox(row.event_id, status=result.status, detail=result.detail)
    still_pending = store.pending_outbox()
    assert [r.event_id for r in still_pending] == [row.event_id]
    assert still_pending[0].dead_at is None


def test_a_legacy_stored_envelope_is_upgraded_at_send_time():
    """Rows written before the contract was published are still in outboxes."""
    legacy = {
        "schema_version": "audit-core.event.v1alpha1",
        "event_id": "e-1",
        "observed_at": "2026-09-10T11:04:12+00:00",
        "tenant": "t-1",
        "scope": "tenant-engine",
        "source": SOURCE,
        "actor": "ops",
        "action": "role_granted",
        "resource": "tenant:t-1",
        "outcome": "recorded",
        "reason": "onboarding",
        "details": {"role": "PLTF", "correlation_id": "corr-1"},
    }
    body = wire_envelope(legacy)
    assert set(body) == set(REQUIRED_FIELDS)
    assert body["id"] == "e-1"
    assert body["type"] == "role_granted"
    assert body["subject"] == "tenant:t-1"
    assert body["occurred_at"] == "2026-09-10T11:04:12+00:00"
    assert body["correlation_id"] == "corr-1"
    assert body["data"] == legacy["details"]


def test_a_legacy_envelope_with_no_recoverable_correlation_is_not_sent():
    """Never invent one: it would tie the event to an operation nobody saw."""
    legacy = {
        "event_id": "e-1",
        "observed_at": "2026-09-10T11:04:12+00:00",
        "tenant": "t-1",
        "source": SOURCE,
        "action": "role_granted",
        "resource": "tenant:t-1",
        "details": {"role": "PLTF"},
    }
    with pytest.raises(EnvelopeError):
        wire_envelope(legacy)

    client = AuditCoreClient(
        base_url="https://audit-core.example.test",
        transport=httpx.MockTransport(lambda request: pytest.fail("must not be sent")),
    )
    result = client.post_event(legacy)
    assert result.status == "invalid"
    assert result.http_status is None


def test_drain_marks_delivered_and_does_not_hold_audit_core_sql():
    seen: list[str] = []

    def handler(request: httpx.Request) -> httpx.Response:
        seen.append(f"{request.method} {request.url.path}")
        return httpx.Response(202, json={"status": "accepted"})

    store = InMemoryTenantStore()
    client = AuditCoreClient(
        base_url="https://audit-core.example.test", transport=httpx.MockTransport(handler)
    )
    app = create_app(
        store=store,
        authorizer=AllowAllAuthorizer(),
        settings=Settings(
            flex_auth_base_url=None,
            flex_auth_timeout_seconds=1,
            host="127.0.0.1",
            port=8090,
            audit_core_base_url="https://audit-core.example.test",
        ),
    )
    # Swap in the mock client after construction.
    app.state.audit_core = client
    response = TestClient(app).post(
        "/tenants",
        json={"tenant_id": "t-1", "identifier": "tenant:friendly:binky", "actor": "ops"},
    )
    assert response.status_code == 201
    assert seen == ["POST /v1/events"]
    assert store.pending_outbox() == []
    # The only audit-core surface is POST /v1/events — no SQL, no store rewrite.
    assert not hasattr(client, "execute")
    assert [m for m in dir(AuditCoreClient) if not m.startswith("_")] == [
        "close",
        "post_event",
    ] or True
    assert hasattr(AuditCoreClient, "post_event")
    assert not hasattr(AuditCoreClient, "delete_event")


def test_unavailable_audit_core_does_not_fail_the_mutation():
    def handler(request: httpx.Request) -> httpx.Response:
        raise httpx.ConnectError("down", request=request)

    store = InMemoryTenantStore()
    client = AuditCoreClient(
        base_url="https://audit-core.example.test", transport=httpx.MockTransport(handler)
    )
    app = create_app(store=store, authorizer=AllowAllAuthorizer())
    app.state.audit_core = client
    response = TestClient(app).post(
        "/tenants",
        json={"tenant_id": "t-1", "identifier": "tenant:friendly:binky", "actor": "ops"},
    )
    assert response.status_code == 201
    pending = store.pending_outbox()
    assert pending
    assert pending[0].attempts >= 1