from pathlib import Path

import pytest
from pydantic import ValidationError

from gewu.application.acceptance import ActorContext
from gewu.application.runs import LocalRunService, RunError
from gewu.domain.contracts import (
    RunCheckpointRequest,
    RunCreateRequest,
    RunModulePin,
    RunState,
    Scope,
)


def _create(run_id: str = "run-pilot") -> RunCreateRequest:
    return RunCreateRequest(
        run_id=run_id,
        objective="Compare audience response",
        scope=Scope(projects=("dome-performance",), include_shared=False),
        lens="Audience behavior",
        pack_id="gewu",
        pack_version="0.3.0",
        pack_snapshot_digest="a" * 64,
        module_pins=(
            RunModulePin(
                module_id="profile",
                implementation_version="1.0.0",
                sha256="b" * 64,
            ),
        ),
    )


def _checkpoint(run_id: str = "run-pilot", **overrides: object) -> RunCheckpointRequest:
    values: dict[str, object] = {
        "run_id": run_id,
        "expected_revision": 0,
        "stage": "source-review",
        "state": RunState.ACTIVE,
        "budgets": {"source_count": 3},
    }
    values.update(overrides)
    return RunCheckpointRequest.model_validate(values)


def test_run_create_and_checkpoint_are_idempotent_and_revision_checked(tmp_path: Path) -> None:
    current = True
    actor = ActorContext("agent-pilot", "pilot-key")
    service = LocalRunService(
        workflow_root=tmp_path / "workflow",
        actor_is_current=lambda _: current,
    )

    created = service.create(_create(), actor=actor)
    assert created.revision == 0
    assert service.create(_create(), actor=actor) == created
    with pytest.raises(RunError, match="different input"):
        service.create(_create().model_copy(update={"objective": "Different"}), actor=actor)

    checkpoint = _checkpoint()
    updated = service.checkpoint(checkpoint, actor=actor)
    assert updated.revision == 1
    assert service.checkpoint(checkpoint, actor=actor) == updated
    with pytest.raises(RunError, match="changed content"):
        service.checkpoint(_checkpoint(stage="different-stage"), actor=actor)
    service.checkpoint(_checkpoint(expected_revision=1, stage="next-stage"), actor=actor)
    with pytest.raises(RunError, match="stale"):
        service.checkpoint(_checkpoint(expected_revision=0, stage="different-stage"), actor=actor)
    assert service.status("run-pilot", actor=actor).revision == 2


def test_run_owner_revocation_and_terminal_state_are_enforced(tmp_path: Path) -> None:
    active = True
    owner = ActorContext("agent-pilot", "pilot-key")
    other = ActorContext("agent-other", "other-key")
    service = LocalRunService(
        workflow_root=tmp_path / "workflow",
        actor_is_current=lambda actor: active and actor.credential_id in {"pilot-key", "other-key"},
    )
    service.create(_create(), actor=owner)
    with pytest.raises(RunError, match="unavailable"):
        service.status("run-pilot", actor=other)

    completed = service.checkpoint(_checkpoint(state=RunState.COMPLETED), actor=owner)
    assert completed.state is RunState.COMPLETED
    with pytest.raises(RunError, match="cannot be updated"):
        service.checkpoint(_checkpoint(expected_revision=1), actor=owner)

    active = False
    with pytest.raises(RunError, match="no longer active"):
        service.checkpoint(_checkpoint(expected_revision=1), actor=owner)
    with pytest.raises(RunError, match="no longer active"):
        service.status("run-pilot", actor=owner)


def test_run_contract_rejects_global_scope_and_negative_budgets() -> None:
    with pytest.raises(ValidationError):
        RunCreateRequest.model_validate(
            _create().model_dump() | {"scope": Scope(projects=("all",), all_projects=True)}
        )
    with pytest.raises(ValidationError):
        RunCheckpointRequest.model_validate(
            {"run_id": "run-pilot", "expected_revision": 0, "stage": "x", "budgets": {"tokens": -1}}
        )