"""Sequential dependency NextAction strategy — AP2.0d / Spec-D D6."""

from __future__ import annotations

from typing import Any

from steering.strategies.next_action.default_strategy import DefaultNextActionStrategy
from steering.strategies.next_action.execution_ready import (
    first_active_gate_id,
    list_execution_ready_candidates,
)
from steering.strategies.next_action.registry import (
    get_next_action_strategy,
    register_next_action_strategy,
)
from tenant_context import TenantContext

_default = DefaultNextActionStrategy()


class SequentialDependencyStrategy:
    key = "sequential_dependency"

    def evaluate(
        self,
        ctx: TenantContext,
        *,
        initiative_id: str | None = None,
        limit: int = 10,
    ) -> list[dict[str, Any]]:
        if limit < 1:
            limit = 1
        if not initiative_id:
            return _default.evaluate(ctx, limit=limit)

        gate_scope = first_active_gate_id(ctx, initiative_id)
        ready = list_execution_ready_candidates(
            ctx,
            initiative_id,
            limit=limit,
            scope_roadmap_item_id=gate_scope,
            prefer_critical_path=True,
        )
        return ready[:limit]


sequential_dependency_strategy = SequentialDependencyStrategy()


def register_sequential_dependency_strategy() -> None:
    if not get_next_action_strategy(sequential_dependency_strategy.key):
        register_next_action_strategy(sequential_dependency_strategy)