"""Durable admission representation: persist before dispatch (T05)."""

from __future__ import annotations

from datetime import UTC, datetime
from pathlib import Path

import pytest

from wf_api.run_lifecycle import (
    load_stored_run,
    materialize_admitted_view,
    persist_admission,
    recover_admission_view,
)
from wf_artifacts import (
    PinnedRunEnvironment,
    StoredRunStatus,
    WorkflowArtifact,
    WorkflowDeployment,
)
from wf_artifacts.runs.store import FileRunStore


def _env() -> PinnedRunEnvironment:
    deployment = WorkflowDeployment(
        id="dep-1",
        artifact_id="wf-1",
        artifact_version=1,
        bindings=[{"logical_source": "demo", "concrete_source": "demo.personal"}],
    )
    artifact = WorkflowArtifact(
        id="wf-1",
        version=1,
        title="Wf-1",
        input_schema={"type": "object", "properties": {}},
        output_schema={"type": "object", "properties": {}},
        outcomes=("ok",),
        plan={"name": "wf-1", "nodes": [], "edges": []},
    )
    return PinnedRunEnvironment(
        deployment=deployment, root_artifact=artifact, child_artifacts=[]
    )


def test_admission_persists_authority_before_view(tmp_path: Path) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    at = datetime(2026, 9, 8, 13, 0, tzinfo=UTC)
    admission = persist_admission(
        store=store,
        run_id=run_id,
        environment=_env(),
        resolved_input={"team": "eng"},
        max_steps=100,
        scheduled_at=at,
        schedule_id="sched-1",
        schedule_revision=2,
    )
    assert admission.id == run_id
    assert admission.scheduled_at == at
    # Admission record exists before any run view or checkpoint.
    assert store.get_admission(run_id).id == run_id
    with pytest.raises(KeyError):
        store.get_run(run_id)
    record = materialize_admitted_view(store=store, admission=admission)
    assert record.status is StoredRunStatus.ADMITTED
    assert record.latest_checkpoint_id is None
    # Inspection distinguishes admitted (no checkpoint) from stopped.
    with pytest.raises(KeyError, match="no checkpoints"):
        store.get_latest_checkpoint(run_id)


def test_admission_view_round_trips_real_serialization(tmp_path: Path) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    admission = persist_admission(
        store=store,
        run_id=run_id,
        environment=_env(),
        resolved_input={"a": [1, None, "x"]},
        max_steps=None,
        scheduled_at=None,
        schedule_id=None,
        schedule_revision=None,
    )
    record = materialize_admitted_view(store=store, admission=admission)
    reloaded = store.get_run(run_id)
    assert reloaded.id == record.id
    assert reloaded.status is StoredRunStatus.ADMITTED
    reloaded_admission = store.get_admission(run_id)
    assert reloaded_admission.resolved_input == {"a": [1, None, "x"]}
    assert reloaded_admission.environment.deployment.id == "dep-1"


def test_run_ids_are_store_backed_across_restart(tmp_path: Path) -> None:
    first = FileRunStore(tmp_path).allocate_run_id()
    second = FileRunStore(tmp_path).allocate_run_id()
    assert first != second
    # Reopening the store never reuses identities.
    third = FileRunStore(tmp_path).allocate_run_id()
    assert third not in {first, second}


def test_fault_before_admission_persists_nothing(tmp_path: Path, monkeypatch) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()

    def _boom(path: Path, payload: object) -> None:
        raise OSError("injected write failure")

    monkeypatch.setattr(store, "_write_json", _boom)
    with pytest.raises(OSError, match="injected"):
        persist_admission(
            store=store,
            run_id=run_id,
            environment=_env(),
            resolved_input={},
            max_steps=None,
            scheduled_at=None,
            schedule_id=None,
            schedule_revision=None,
        )
    assert FileRunStore(tmp_path).list_admissions() == []
    with pytest.raises(KeyError):
        store.get_admission(run_id)


def test_fault_between_admission_and_view_recovers_without_dispatch(
    tmp_path: Path,
) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    admission = persist_admission(
        store=store,
        run_id=run_id,
        environment=_env(),
        resolved_input={"team": "eng"},
        max_steps=None,
        scheduled_at=None,
        schedule_id=None,
        schedule_revision=None,
    )
    assert admission.id == run_id
    # Crash before the view is materialized: admission exists, view missing.
    with pytest.raises(KeyError):
        store.get_run(run_id)
    # Recovery materializes the missing view but never executes work.
    record = recover_admission_view(store=store, run_id=run_id)
    assert record.status is StoredRunStatus.ADMITTED
    assert store.get_run(run_id).id == run_id
    # Idempotent: second recovery returns the same view.
    again = recover_admission_view(store=store, run_id=run_id)
    assert again.id == run_id


def test_admitted_run_has_no_fabricated_checkpoint_or_output(
    tmp_path: Path,
) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    admission = persist_admission(
        store=store,
        run_id=run_id,
        environment=_env(),
        resolved_input={},
        max_steps=None,
        scheduled_at=None,
        schedule_id=None,
        schedule_revision=None,
    )
    record = materialize_admitted_view(store=store, admission=admission)
    assert record.latest_checkpoint_id is None
    assert store.list_checkpoints(run_id) == []
    # Loading a stopped run from an admitted view must fail closed, not
    # fabricate trace/output/step counts.
    with pytest.raises(ValueError, match="admitted"):
        load_stored_run(store, run_id)


def test_corrupt_run_id_sequence_fails_closed(tmp_path: Path) -> None:
    FileRunStore(tmp_path)
    seq_path = tmp_path / "runs" / "_run_id_seq.json"
    seq_path.write_text('{"seq": "not-an-int"}', encoding="utf-8")
    with pytest.raises(ValueError, match="corrupt run-id sequence"):
        FileRunStore(tmp_path).allocate_run_id()


def test_view_without_admission_fails_closed(tmp_path: Path) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    admission = persist_admission(
        store=store,
        run_id=run_id,
        environment=_env(),
        resolved_input={},
        max_steps=None,
        scheduled_at=None,
        schedule_id=None,
        schedule_revision=None,
    )
    materialize_admitted_view(store=store, admission=admission)
    (tmp_path / "runs" / run_id / "admission.json").unlink()
    with pytest.raises(KeyError, match="unknown run admission"):
        recover_admission_view(store=store, run_id=run_id)


def test_non_json_resolved_input_rejected_before_dispatch(tmp_path: Path) -> None:
    store = FileRunStore(tmp_path)
    run_id = store.allocate_run_id()
    with pytest.raises(ValueError, match="must be finite"):
        persist_admission(
            store=store,
            run_id=run_id,
            environment=_env(),
            resolved_input={"x": float("inf")},  # type: ignore[dict-item]
            max_steps=None,
            scheduled_at=None,
            schedule_id=None,
            schedule_revision=None,
        )