"""Server scheduler composition (T12): config mapping and store wiring.

Scheduling stays off unless the config section or the CLI flag enables
it. When enabled, the service runs over the server's own stores behind
one composition lock, and the transport lifespan owns start/stop.
"""

from __future__ import annotations

from pathlib import Path

from wf_config import WorkflowConfigFile
from wf_scheduling.lifecycle import DrainReport, SchedulerServiceConfig
from wf_scheduling.ownership import SchedulerOwnership
from wf_server.context import build_local_static_workflow_server
from wf_server.scheduling import (
    build_scheduler_service,
    scheduler_lifespan,
    server_scheduler_config,
)


def test_server_scheduler_config_disabled_by_default() -> None:
    assert server_scheduler_config(None, False) is None

    bare = WorkflowConfigFile.model_validate({"version": 1})
    assert server_scheduler_config(bare, False) is None

    file_disabled = WorkflowConfigFile.model_validate(
        {"version": 1, "server": {"scheduler": {"enabled": False}}}
    )
    assert server_scheduler_config(file_disabled, False) is None


def test_server_scheduler_config_flag_enables_defaults_without_config() -> None:
    resolved = server_scheduler_config(None, True)

    assert resolved is not None
    assert resolved.poll_interval_s == 1.0
    assert resolved.capacity == 4
    assert resolved.drain_grace_s == 30.0
    assert resolved.auto_tick is True


def test_server_scheduler_config_maps_file_values() -> None:
    config = WorkflowConfigFile.model_validate(
        {
            "version": 1,
            "server": {
                "scheduler": {
                    "enabled": True,
                    "poll_interval_s": 2.5,
                    "max_concurrent_runs": 8,
                    "drain_grace_s": 60.0,
                },
            },
        }
    )

    resolved = server_scheduler_config(config, False)

    assert resolved is not None
    assert resolved.poll_interval_s == 2.5
    assert resolved.capacity == 8
    assert resolved.drain_grace_s == 60.0
    assert resolved.auto_tick is True


def test_server_scheduler_config_flag_overrides_disabled_section() -> None:
    config = WorkflowConfigFile.model_validate(
        {
            "version": 1,
            "server": {
                "scheduler": {"enabled": False, "max_concurrent_runs": 2},
            },
        }
    )

    resolved = server_scheduler_config(config, True)

    assert resolved is not None
    assert resolved.capacity == 2
    assert resolved.auto_tick is True


def test_build_scheduler_service_wires_server_stores(tmp_path: Path) -> None:
    server = build_local_static_workflow_server(tmp_path)
    service = build_scheduler_service(server, SchedulerServiceConfig(auto_tick=False))

    assert service.schedule_store.root == server.config.store_root
    assert (
        service.schedule_store.schedules_dir == server.config.store_root / "schedules"
    )
    assert service.run_store is server.stores.run_store
    assert service.artifact_store is server.stores.artifact_store
    assert service.runtime is server.context.runtime
    assert service.ownership.lock_path == server.config.store_root / "scheduler.lock"


async def test_scheduler_service_start_stop_on_server_stores(
    tmp_path: Path,
) -> None:
    server = build_local_static_workflow_server(tmp_path)
    service = build_scheduler_service(server, SchedulerServiceConfig(auto_tick=False))

    await service.start()
    try:
        assert service.running is True
        assert service.ownership.covers(
            service.schedule_store.root, service.run_store.root
        )
    finally:
        report = await service.stop()

    assert isinstance(report, DrainReport)
    assert service.running is False
    # The lock is released: a fresh owner can acquire the same composition.
    probe = SchedulerOwnership(tmp_path, owner="probe")
    probe.acquire()
    try:
        assert probe.held is True
    finally:
        probe.release()


async def test_scheduler_lifespan_releases_lock_on_exit(tmp_path: Path) -> None:
    server = build_local_static_workflow_server(tmp_path)
    resolved = server_scheduler_config(None, True)
    assert resolved is not None

    async with scheduler_lifespan(server, resolved) as service:
        assert service.running is True

    probe = SchedulerOwnership(tmp_path, owner="probe")
    probe.acquire()
    try:
        assert probe.held is True
    finally:
        probe.release()