"""Agile iteration NextAction strategy — AP2.0f (active work_cycle first)."""

from __future__ import annotations

from typing import Any

from steering.signals import default_rules
from steering.strategies.next_action.continuous_product import (
    ContinuousProductStrategy,
)
from steering.strategies.next_action.default_strategy import DefaultNextActionStrategy
from steering.strategies.next_action.execution_ready import (
    blocked_execution_action_ids,
    build_execution_ready_candidates,
    list_execution_ready_candidates,
    merge_candidates,
)
from steering.strategies.next_action.registry import (
    get_next_action_strategy,
    register_next_action_strategy,
)
from services.work_cycle import get_active_work_cycle
from tenant_context import TenantContext

_default = DefaultNextActionStrategy()
_continuous = ContinuousProductStrategy()


class AgileIterationStrategy:
    key = "agile_iteration"

    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)

        active = get_active_work_cycle(
            tenant_id=ctx.tenant_id, initiative_id=initiative_id
        )
        if not active:
            return _continuous.evaluate(ctx, initiative_id=initiative_id, limit=limit)

        cycle_id = active["id"]
        from services import actions as action_service
        from steering.graph.execution_engine import load_initiative_execution_graph_state

        actions = action_service.list_actions_for_initiative(
            tenant_id=ctx.tenant_id, initiative_id=initiative_id
        )
        cycle_actions = [
            a for a in actions if str(a.get("work_cycle_id") or "") == cycle_id
        ]
        if not cycle_actions:
            ready = list_execution_ready_candidates(
                ctx, initiative_id, limit=limit, prefer_critical_path=True
            )
            if ready:
                return ready[:limit]
            return _continuous.evaluate(ctx, initiative_id=initiative_id, limit=limit)

        graph_state = load_initiative_execution_graph_state(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_id,
        )
        blocked_ids = blocked_execution_action_ids(ctx, initiative_id)
        ready = build_execution_ready_candidates(
            actions=cycle_actions,
            graph_state=graph_state,
            limit=limit,
            prefer_critical_path=True,
        )
        for item in ready:
            item["reason_code"] = "work_cycle_ready"
            item["summary"] = f"Aktive Zeitbox „{active['title']}“ — ausführungsbereit"
            item["recommended_action"] = "In dieser Iteration ausführen"

        if len(ready) >= limit:
            return ready[:limit]

        rest = _continuous.evaluate(
            ctx, initiative_id=initiative_id, limit=limit - len(ready)
        )
        filtered = [
            item
            for item in rest
            if not item.get("action_id") or item["action_id"] not in blocked_ids
        ]
        return merge_candidates(ready, filtered, limit=limit, exclude_action_ids=blocked_ids)


agile_iteration_strategy = AgileIterationStrategy()


def register_agile_iteration_strategy() -> None:
    if not get_next_action_strategy(agile_iteration_strategy.key):
        register_next_action_strategy(agile_iteration_strategy)