"""Tests for RunLedgerStore host primitives."""

from __future__ import annotations

import datetime

import pytest
import sqlalchemy
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm import sessionmaker

from langbot.pkg.agent.runner.run_ledger_store import RunLedgerStore
from langbot.pkg.entity.persistence.agent_run import AgentRun
from langbot.pkg.entity.persistence.base import Base


UTC = datetime.timezone.utc


@pytest.fixture
async def db_engine(tmp_path):
    db_path = tmp_path / 'run_ledger_store.db'
    engine = create_async_engine(f'sqlite+aiosqlite:///{db_path}', echo=False)

    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    yield engine

    await engine.dispose()


@pytest.fixture
def store(db_engine):
    return RunLedgerStore(db_engine)


@pytest.mark.asyncio
async def test_create_queued_run_claim_renew_release(store):
    run = await store.create_run(
        run_id='run-queued',
        event_id='evt-1',
        binding_id='binding-1',
        runner_id='runner-a',
        status='queued',
        queue_name='default',
        priority=10,
        requested_runtime_id='runtime-a',
    )

    assert run['status'] == 'queued'
    assert run['started_at'] is None
    assert run['queue_name'] == 'default'
    assert run['priority'] == 10
    assert run['requested_runtime_id'] == 'runtime-a'

    assert await store.claim_next_run(runtime_id='runtime-b', queue_name='default') is None

    claimed = await store.claim_next_run(runtime_id='runtime-a', queue_name='default', lease_seconds=30)

    assert claimed is not None
    assert claimed['run_id'] == 'run-queued'
    assert claimed['status'] == 'claimed'
    assert claimed['claimed_by_runtime_id'] == 'runtime-a'
    assert claimed['claim_token']
    assert claimed['dispatch_attempts'] == 1
    assert claimed['claim_lease_expires_at'] is not None
    assert claimed['last_claimed_at'] is not None

    token = claimed['claim_token']
    assert await store.renew_claim(run_id='run-queued', claim_token='wrong-token') is None

    renewed = await store.renew_claim(run_id='run-queued', claim_token=token, lease_seconds=90)

    assert renewed is not None
    assert renewed['claim_token'] == token
    assert renewed['claim_lease_expires_at'] >= claimed['claim_lease_expires_at']

    released = await store.release_claim(
        run_id='run-queued',
        claim_token=token,
        status='queued',
        status_reason='runtime released capacity',
    )

    assert released is not None
    assert released['status'] == 'queued'
    assert released['status_reason'] == 'runtime released capacity'
    assert released['claimed_by_runtime_id'] is None
    assert released['claim_token'] is None
    assert released['claim_lease_expires_at'] is None
    assert released['dispatch_attempts'] == 1


@pytest.mark.asyncio
async def test_expired_claim_can_be_reclaimed(store, db_engine):
    await store.create_run(
        run_id='run-expired',
        event_id='evt-2',
        binding_id='binding-1',
        runner_id='runner-a',
        status='queued',
        queue_name='default',
    )
    first_claim = await store.claim_next_run(runtime_id='runtime-a', queue_name='default', lease_seconds=60)
    assert first_claim is not None

    session_factory = sessionmaker(db_engine, class_=AsyncSession, expire_on_commit=False)
    async with session_factory() as session:
        await session.execute(
            sqlalchemy.update(AgentRun)
            .where(AgentRun.run_id == 'run-expired')
            .values(claim_lease_expires_at=datetime.datetime.now(UTC) - datetime.timedelta(seconds=1))
        )
        await session.commit()

    reclaimed = await store.claim_next_run(runtime_id='runtime-b', queue_name='default', lease_seconds=60)

    assert reclaimed is not None
    assert reclaimed['run_id'] == 'run-expired'
    assert reclaimed['claimed_by_runtime_id'] == 'runtime-b'
    assert reclaimed['claim_token'] != first_claim['claim_token']
    assert reclaimed['dispatch_attempts'] == 2


@pytest.mark.asyncio
async def test_runtime_register_heartbeat_list_and_mark_stale(store):
    registered = await store.register_runtime(
        runtime_id='runtime-a',
        display_name='Runtime A',
        endpoint='http://runtime-a',
        version='1.0.0',
        capabilities={'stream': True},
        labels={'region': 'test'},
        metadata={'slot_count': 2},
        heartbeat_deadline_seconds=30,
    )

    assert registered['runtime_id'] == 'runtime-a'
    assert registered['status'] == 'online'
    assert registered['display_name'] == 'Runtime A'
    assert registered['capabilities'] == {'stream': True}
    assert registered['labels'] == {'region': 'test'}
    assert registered['metadata'] == {'slot_count': 2}
    assert registered['last_heartbeat_at'] is not None
    assert registered['heartbeat_deadline_at'] is not None

    heartbeat = await store.heartbeat_runtime(
        runtime_id='runtime-a',
        metadata={'active_runs': 1},
        heartbeat_deadline_seconds=30,
    )

    assert heartbeat is not None
    assert heartbeat['metadata'] == {'slot_count': 2, 'active_runs': 1}

    runtimes = await store.list_runtimes(statuses=['online'])
    assert [runtime['runtime_id'] for runtime in runtimes] == ['runtime-a']

    stale = await store.mark_stale_runtimes(
        now=datetime.datetime.now(UTC) + datetime.timedelta(seconds=31),
    )

    assert [runtime['runtime_id'] for runtime in stale] == ['runtime-a']
    assert stale[0]['status'] == 'stale'
    assert (await store.get_runtime('runtime-a'))['status'] == 'stale'