"""Minimale Operating-Transitions — AP1.0 mit Hook Dispatch."""

from __future__ import annotations

from typing import Any, Optional

from psycopg2.extras import RealDictCursor

from db import get_connection
from steering.hooks.dispatch import dispatch_hook

RESOLVED_BLOCKER_STATUSES = frozenset({"resolved", "accepted_risk", "dismissed"})


def after_blocker_status_change(
    *,
    tenant_id: str,
    blocker_id: str,
    action_id: Optional[str],
    initiative_id: Optional[str] = None,
    old_status: str,
    new_status: str,
    user_id: Optional[str] = None,
) -> list[dict[str, Any]]:
    """Blocker geschlossen → verknüpfte blockierte Maßnahme entblocken."""
    effects: list[dict[str, Any]] = []
    if new_status == old_status:
        return effects
    if new_status not in RESOLVED_BLOCKER_STATUSES or not action_id:
        return effects

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, status FROM actions
                WHERE id = %s AND tenant_id = %s
                """,
                (action_id, tenant_id),
            )
            action = cur.fetchone()
            if not action or action["status"] != "blocked":
                return effects

            cur.execute(
                """
                SELECT COUNT(*) AS remaining
                FROM blockers
                WHERE tenant_id = %s AND action_id = %s
                  AND id != %s AND status IN ('open', 'in_progress')
                """,
                (tenant_id, action_id, blocker_id),
            )
            row = cur.fetchone()
            remaining = int(row["remaining"]) if row else 0
            if remaining > 0:
                effects.append(
                    {
                        "kind": "action_still_blocked",
                        "action_id": str(action_id),
                        "reason": "other_open_blockers",
                    }
                )
                return effects

            cur.execute(
                """
                UPDATE actions SET status = 'open', updated_at = NOW()
                WHERE id = %s AND tenant_id = %s AND status = 'blocked'
                RETURNING id
                """,
                (action_id, tenant_id),
            )
            if cur.fetchone():
                effects.append(
                    {
                        "kind": "action_unblocked",
                        "action_id": str(action_id),
                        "trigger": "blocker_resolved",
                        "blocker_id": blocker_id,
                    }
                )
        conn.commit()
    finally:
        conn.close()

    if effects:
        dispatch_hook(
            "on_blocker_resolved",
            None,
            {
                "blocker_id": blocker_id,
                "action_id": action_id,
                "initiative_id": initiative_id,
                "effects": effects,
            },
            tenant_id=tenant_id,
            user_id=user_id,
        )
        if initiative_id and user_id:
            from steering.lifecycle.orchestrator import transition

            transition(
                None,
                initiative_id,
                "action_selection",
                reason="blocker_resolved",
                tenant_id=tenant_id,
                user_id=user_id,
            )

    if effects and user_id:
        from services.audit import log_audit

        log_audit(
            "operating_transition.action_unblocked",
            user_id=user_id,
            tenant_id=tenant_id,
            details={"effects": effects, "blocker_id": blocker_id},
        )
    return effects


def after_review_status_change(
    *,
    tenant_id: str,
    review_id: str,
    action_id: Optional[str],
    initiative_id: Optional[str] = None,
    old_status: str,
    new_status: str,
    user_id: Optional[str] = None,
) -> list[dict[str, Any]]:
    """Review abgeschlossen → Maßnahme aus review_required weiterführen."""
    effects: list[dict[str, Any]] = []
    if new_status == old_status or new_status != "completed" or not action_id:
        return effects

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                UPDATE actions
                SET status = 'done', updated_at = NOW()
                WHERE id = %s AND tenant_id = %s AND status = 'review_required'
                RETURNING id
                """,
                (action_id, tenant_id),
            )
            if cur.fetchone():
                effects.append(
                    {
                        "kind": "action_completed_after_review",
                        "action_id": str(action_id),
                        "trigger": "review_completed",
                        "review_id": review_id,
                    }
                )
        conn.commit()
    finally:
        conn.close()

    if effects:
        dispatch_hook(
            "on_review_completed",
            None,
            {
                "review_id": review_id,
                "action_id": action_id,
                "initiative_id": initiative_id,
                "effects": effects,
            },
            tenant_id=tenant_id,
            user_id=user_id,
        )

    if effects and user_id:
        from services.audit import log_audit

        log_audit(
            "operating_transition.action_completed_after_review",
            user_id=user_id,
            tenant_id=tenant_id,
            details={"effects": effects, "review_id": review_id},
        )
    return effects