from datetime import UTC, datetime, timedelta

from fastapi.testclient import TestClient

from zbt.commands.seed import build_seed_manifest
from zbt.core.config import Settings
from zbt.core.passwords import PasswordService
from zbt.domains.catalog.repository import InMemoryCatalogRepository
from zbt.domains.enrollment.models import OutboxEvent
from zbt.domains.enrollment.repository import InMemoryEnrollmentRepository
from zbt.domains.identity.repository import InMemoryIdentityRepository
from zbt.domains.surrender.monitoring import (
    InMemoryWorkerRegistry,
    RefundOperationsMonitor,
    WorkerInstance,
)
from zbt.infrastructure.redis.worker_registry import RedisWorkerRegistry
from zbt.main import create_app

NOW = datetime(2026, 7, 29, 10, 0, tzinfo=UTC)


def event(
    event_id: str,
    *,
    status: str,
    attempt_count: int = 0,
    last_error: str | None = None,
) -> OutboxEvent:
    return OutboxEvent(
        id=event_id,
        aggregate_type="SURRENDER_REQUEST",
        aggregate_id=f"request-{event_id}",
        event_type="SURRENDER_REFUND_REQUESTED",
        payload={},
        status=status,
        created_at=NOW - timedelta(minutes=attempt_count + 1),
        attempt_count=attempt_count,
        available_at=NOW + timedelta(seconds=30) if status == "RETRY" else None,
        last_error=last_error,
    )


def test_refund_operations_snapshot_aggregates_workers_queue_and_failures() -> None:
    enrollments = InMemoryEnrollmentRepository()
    enrollments.save_outbox_event(event("pending", status="PENDING"))
    enrollments.save_outbox_event(
        event(
            "retry",
            status="RETRY",
            attempt_count=2,
            last_error="支付渠道连接超时",
        )
    )
    enrollments.save_outbox_event(
        event(
            "dead",
            status="DEAD",
            attempt_count=5,
            last_error="超过最大重试次数",
        )
    )
    enrollments.save_outbox_event(event("published", status="PUBLISHED", attempt_count=1))
    registry = InMemoryWorkerRegistry()
    registry.start(
        WorkerInstance(
            instance_id="worker-01",
            worker_name="refund",
            mode="parallel",
            host="node-a",
            pid=31001,
            status="RUNNING",
            started_at=NOW - timedelta(minutes=5),
            last_heartbeat_at=NOW,
            last_poll_at=NOW,
            last_processed_at=NOW - timedelta(seconds=10),
            total_processed=12,
            last_error=None,
        )
    )

    snapshot = RefundOperationsMonitor(
        enrollments,
        registry,
        clock=lambda: NOW,
    ).snapshot()

    assert snapshot["workers"]["online"] == 1
    assert snapshot["workers"]["items"][0]["instance_id"] == "worker-01"
    assert snapshot["queue"] == {
        "total": 4,
        "pending": 1,
        "processing": 0,
        "retrying": 1,
        "dead": 1,
        "cancelled": 0,
        "completed": 1,
    }
    assert snapshot["failures"][0]["event_id"] == "dead"
    assert snapshot["failures"][0]["request_id"] == "request-dead"
    assert snapshot["failures"][0]["last_error"] == "超过最大重试次数"
    assert snapshot["failures"][1]["event_id"] == "retry"


def test_monitor_only_counts_refund_events_and_limits_failure_details() -> None:
    enrollments = InMemoryEnrollmentRepository()
    for index in range(25):
        enrollments.save_outbox_event(
            event(
                f"failed-{index:02d}",
                status="RETRY",
                attempt_count=index,
                last_error=f"错误-{index}",
            )
        )
    enrollments.save_outbox_event(
        OutboxEvent(
            id="unrelated",
            aggregate_type="ORDER",
            aggregate_id="order-1",
            event_type="POLICY_ISSUE_REQUESTED",
            payload={},
            status="PENDING",
            created_at=NOW,
        )
    )

    snapshot = RefundOperationsMonitor(
        enrollments,
        InMemoryWorkerRegistry(),
        clock=lambda: NOW,
    ).snapshot(failure_limit=20)

    assert snapshot["workers"]["online"] == 0
    assert snapshot["queue"]["total"] == 25
    assert len(snapshot["failures"]) == 20
    assert snapshot["failures"][0]["event_id"] == "failed-24"


class FakeWorkerRegistryRedis:
    def __init__(self) -> None:
        self.hashes: dict[str, dict[str, str]] = {}
        self.expirations: dict[str, int] = {}

    def hset(self, name: str, key: str, value: str) -> int:
        values = self.hashes.setdefault(name, {})
        created = int(key not in values)
        values[key] = value
        return created

    def expire(self, name: str, seconds: int) -> bool:
        self.expirations[name] = seconds
        return True

    def scan_iter(self, match: str) -> list[str]:
        prefix = match.removesuffix("*")
        return [name for name in self.hashes if name.startswith(prefix)]

    def hgetall(self, name: str) -> dict[str, str]:
        return self.hashes.get(name, {})


class Redis32WorkerRegistryRedis:
    """只实现 Redis 3.2 支持的单字段 HSET 形式。"""

    def __init__(self) -> None:
        self.hashes: dict[str, dict[str, str]] = {}
        self.expirations: dict[str, int] = {}

    def hset(self, name: str, key: str, value: str) -> int:
        values = self.hashes.setdefault(name, {})
        created = int(key not in values)
        values[key] = value
        return created

    def expire(self, name: str, seconds: int) -> bool:
        self.expirations[name] = seconds
        return True

    def scan_iter(self, match: str) -> list[str]:
        prefix = match.removesuffix("*")
        return [name for name in self.hashes if name.startswith(prefix)]

    def hgetall(self, name: str) -> dict[str, str]:
        return self.hashes.get(name, {})


def test_redis_worker_registry_supports_redis_32_single_field_hset() -> None:
    redis = Redis32WorkerRegistryRedis()
    registry = RedisWorkerRegistry(
        redis,
        prefix="ins:s3:test:redis32:",
        ttl_seconds=30,
    )

    registry.start(
        WorkerInstance(
            instance_id="worker-redis32-01",
            worker_name="refund",
            mode="singleton",
            host="legacy-node",
            pid=32032,
            status="RUNNING",
            started_at=NOW,
            last_heartbeat_at=NOW,
            last_poll_at=None,
            last_processed_at=None,
            total_processed=0,
            last_error=None,
        )
    )

    instances = registry.list_instances("refund")
    assert instances[0].instance_id == "worker-redis32-01"
    assert instances[0].status == "RUNNING"
    assert (
        redis.expirations[
            "ins:s3:test:redis32:worker:instance:refund:worker-redis32-01"
        ]
        == 30
    )


def test_redis_worker_registry_refreshes_ttl_and_accumulates_processed_count() -> None:
    redis = FakeWorkerRegistryRedis()
    registry = RedisWorkerRegistry(
        redis,
        prefix="ins:s3:test:monitor:",
        ttl_seconds=30,
    )
    registry.start(
        WorkerInstance(
            instance_id="worker-redis-01",
            worker_name="refund",
            mode="singleton",
            host="node-a",
            pid=32001,
            status="RUNNING",
            started_at=NOW,
            last_heartbeat_at=NOW,
            last_poll_at=None,
            last_processed_at=None,
            total_processed=0,
            last_error=None,
        )
    )
    registry.record_poll(
        "worker-redis-01",
        occurred_at=NOW + timedelta(seconds=2),
        processed=3,
    )
    registry.heartbeat("worker-redis-01", NOW + timedelta(seconds=10))

    instances = registry.list_instances("refund")

    assert instances[0].total_processed == 3
    assert instances[0].last_processed_at == NOW + timedelta(seconds=2)
    assert instances[0].last_heartbeat_at == NOW + timedelta(seconds=10)
    assert redis.expirations["ins:s3:test:monitor:worker:instance:refund:worker-redis-01"] == 30


def test_admin_can_read_refund_worker_operations_but_cannot_run_worker_via_api() -> None:
    identities = InMemoryIdentityRepository()
    for admin in build_seed_manifest(PasswordService().hash("zaq1XSW@")).admin_users:
        identities.save_admin_user(admin)
    enrollments = InMemoryEnrollmentRepository()
    enrollments.save_outbox_event(event("pending-api", status="PENDING"))
    registry = InMemoryWorkerRegistry()
    registry.start(instance := WorkerInstance(
        instance_id="worker-api-01",
        worker_name="refund",
        mode="singleton",
        host="node-a",
        pid=34001,
        status="RUNNING",
        started_at=NOW,
        last_heartbeat_at=NOW,
        last_poll_at=NOW,
        last_processed_at=None,
        total_processed=0,
        last_error=None,
    ))
    app = create_app(
        settings=Settings(
            app_env="test",
            jwt_access_secret="a" * 32,
            jwt_refresh_secret="b" * 32,
            field_encryption_key="c" * 32,
        ),
        identity_repository=identities,
        catalog_repository=InMemoryCatalogRepository(),
        enrollment_repository=enrollments,
        worker_registry=registry,
        clock=lambda: NOW,
    )

    with TestClient(app) as client:
        login = client.post(
            "/api/v1/admin/auth/login",
            json={"username": "admin", "password": "zaq1XSW@"},
        )
        token = login.json()["data"]["tokens"]["access_token"]
        headers = {"Authorization": f"Bearer {token}"}
        snapshot = client.get("/api/v1/admin/refund-operations", headers=headers)
        removed_trigger = client.post(
            "/api/v1/dev/refund-worker/run-once",
            headers=headers,
        )

    assert instance.instance_id == "worker-api-01"
    assert snapshot.status_code == 200
    assert snapshot.json()["data"]["workers"]["online"] == 1
    assert snapshot.json()["data"]["queue"]["pending"] == 1
    assert removed_trigger.status_code == 404