"""Roadmap service — tenant-scoped Plan/Gates (AP1.4)."""

from __future__ import annotations

import json
from datetime import date
from typing import Any, Literal, Optional

from psycopg2.extras import RealDictCursor

from db import get_connection
from services.audit import log_audit
from services.initiatives import get_initiative
from services.roadmap_criteria import create_default_criterion, prepare_criteria_for_verify

RoadmapItemType = Literal["milestone", "review_gate", "maturity_stage", "work_cycle", "join_gate"]
RoadmapItemStatus = Literal[
    "planned", "active", "at_risk", "reached", "moved", "discarded"
]
SequencingMode = Literal["sequential", "parallel", "optional"]
DependencyType = Literal["requires", "blocks", "related", "parallel_group", "optional_branch"]

ROADMAP_ITEM_TYPES = frozenset({"milestone", "review_gate", "maturity_stage", "work_cycle", "join_gate"})
ROADMAP_ITEM_STATUSES = frozenset(
    {"planned", "active", "at_risk", "reached", "moved", "discarded"}
)
SEQUENCING_MODES = frozenset({"sequential", "parallel", "optional"})
DEPENDENCY_TYPES = frozenset({"requires", "blocks", "related", "parallel_group", "optional_branch"})

TERMINAL_STATUSES = frozenset({"reached", "moved", "discarded"})


def _serialize_row(row: dict[str, Any]) -> dict[str, Any]:
    result = dict(row)
    for key in ("id", "tenant_id", "roadmap_id", "initiative_id", "from_item_id", "to_item_id", "strand_project_id"):
        if result.get(key):
            result[key] = str(result[key])
    if result.get("target_date"):
        result["target_date"] = (
            result["target_date"].isoformat()
            if hasattr(result["target_date"], "isoformat")
            else str(result["target_date"])
        )
    for ts in ("created_at", "updated_at"):
        if result.get(ts):
            result[ts] = result[ts].isoformat()
    dod = result.get("definition_of_done")
    if isinstance(dod, str):
        result["definition_of_done"] = json.loads(dod)
    return result


def _validate_item_type(item_type: str) -> None:
    if item_type not in ROADMAP_ITEM_TYPES:
        raise ValueError(f"Ungültiger RoadmapItem-Typ: {item_type}")


def _validate_status(status: str) -> None:
    if status not in ROADMAP_ITEM_STATUSES:
        raise ValueError(f"Ungültiger RoadmapItem-Status: {status}")


def _validate_sequencing_mode(mode: str) -> None:
    if mode not in SEQUENCING_MODES:
        raise ValueError(f"Ungültiger sequencing_mode: {mode}")


def _validate_dependency_type(dep_type: str) -> None:
    if dep_type not in DEPENDENCY_TYPES:
        raise ValueError(f"Ungültiger dependency_type: {dep_type}")


def _sync_milestone_compat_row(
    cur,
    *,
    tenant_id: str,
    initiative_id: str,
    item: dict[str, Any],
) -> None:
    """Hält milestones-Tabelle für Evidence/Review-FKs synchron (Compat bis Drop)."""
    if item["item_type"] != "milestone":
        cur.execute(
            "DELETE FROM milestones WHERE id = %s AND tenant_id = %s",
            (item["id"], tenant_id),
        )
        return

    target_date = item.get("target_date")
    if target_date and isinstance(target_date, str):
        target_date = date.fromisoformat(target_date)

    cur.execute(
        """
        INSERT INTO milestones (
            id, tenant_id, initiative_id, title, goal_description, status, target_date
        )
        VALUES (%s, %s, %s, %s, %s, %s, %s)
        ON CONFLICT (id) DO UPDATE SET
            title = EXCLUDED.title,
            goal_description = EXCLUDED.goal_description,
            status = EXCLUDED.status,
            target_date = EXCLUDED.target_date,
            updated_at = NOW()
        """,
        (
            item["id"],
            tenant_id,
            initiative_id,
            item["title"],
            item.get("goal_description", ""),
            item["status"],
            target_date,
        ),
    )


def ensure_roadmap(*, tenant_id: str, initiative_id: str) -> dict[str, Any]:
    if not get_initiative(tenant_id=tenant_id, initiative_id=initiative_id):
        raise ValueError("Initiative nicht gefunden")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, tenant_id, initiative_id, title, created_at, updated_at
                FROM roadmaps
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            row = cur.fetchone()
            if row:
                return _serialize_row(dict(row))

            cur.execute(
                """
                INSERT INTO roadmaps (tenant_id, initiative_id, title)
                VALUES (%s, %s, 'Plan')
                RETURNING id, tenant_id, initiative_id, title, created_at, updated_at
                """,
                (tenant_id, initiative_id),
            )
            result = _serialize_row(dict(cur.fetchone()))
        conn.commit()
        return result
    finally:
        conn.close()


def get_roadmap_for_initiative(*, tenant_id: str, initiative_id: str) -> Optional[dict[str, Any]]:
    if not get_initiative(tenant_id=tenant_id, initiative_id=initiative_id):
        raise ValueError("Initiative nicht gefunden")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, tenant_id, initiative_id, title, created_at, updated_at
                FROM roadmaps
                WHERE tenant_id = %s AND initiative_id = %s
                """,
                (tenant_id, initiative_id),
            )
            row = cur.fetchone()
            return _serialize_row(dict(row)) if row else None
    finally:
        conn.close()


def list_roadmap_items_for_initiative(
    *, tenant_id: str, initiative_id: str
) -> list[dict[str, Any]]:
    roadmap = get_roadmap_for_initiative(tenant_id=tenant_id, initiative_id=initiative_id)
    if not roadmap:
        return []

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT
                    ri.id, ri.tenant_id, ri.roadmap_id, r.initiative_id,
                    ri.item_type, ri.title, ri.goal_description, ri.definition_of_done,
                    ri.status, ri.sequencing_mode, ri.target_date, ri.sort_order,
                    ri.strand_project_id,
                    ri.created_at, ri.updated_at
                FROM roadmap_items ri
                JOIN roadmaps r ON r.id = ri.roadmap_id AND r.tenant_id = ri.tenant_id
                WHERE ri.tenant_id = %s AND r.initiative_id = %s
                ORDER BY ri.sort_order ASC, ri.target_date NULLS LAST, ri.title
                """,
                (tenant_id, initiative_id),
            )
            return [_serialize_row(dict(r)) for r in cur.fetchall()]
    finally:
        conn.close()


def get_roadmap_item(*, tenant_id: str, item_id: str) -> Optional[dict[str, Any]]:
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT
                    ri.id, ri.tenant_id, ri.roadmap_id, r.initiative_id,
                    ri.item_type, ri.title, ri.goal_description, ri.definition_of_done,
                    ri.status, ri.sequencing_mode, ri.target_date, ri.sort_order,
                    ri.strand_project_id,
                    ri.created_at, ri.updated_at
                FROM roadmap_items ri
                JOIN roadmaps r ON r.id = ri.roadmap_id AND r.tenant_id = ri.tenant_id
                WHERE ri.id = %s AND ri.tenant_id = %s
                """,
                (item_id, tenant_id),
            )
            row = cur.fetchone()
            return _serialize_row(dict(row)) if row else None
    finally:
        conn.close()


def create_roadmap_item(
    *,
    tenant_id: str,
    initiative_id: str,
    title: str,
    item_type: RoadmapItemType = "milestone",
    goal_description: str = "",
    definition_of_done: Optional[list[Any]] = None,
    status: RoadmapItemStatus = "planned",
    sequencing_mode: SequencingMode = "sequential",
    target_date: Optional[date] = None,
    sort_order: int = 0,
    strand_project_id: Optional[str] = None,
    initial_criterion_title: Optional[str] = None,
    user_id: Optional[str] = None,
) -> dict[str, Any]:
    title = title.strip()
    if not title:
        raise ValueError("Titel ist erforderlich")
    _validate_item_type(item_type)
    _validate_status(status)
    if status == "reached":
        raise ValueError("Status 'reached' nur über verify-reached")
    _validate_sequencing_mode(sequencing_mode)

    roadmap = ensure_roadmap(tenant_id=tenant_id, initiative_id=initiative_id)
    dod = definition_of_done if definition_of_done is not None else []

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                INSERT INTO roadmap_items (
                    tenant_id, roadmap_id, item_type, title, goal_description,
                    definition_of_done, status, sequencing_mode, target_date, sort_order,
                    strand_project_id
                )
                VALUES (%s, %s, %s, %s, %s, %s::jsonb, %s, %s, %s, %s, %s)
                RETURNING id, tenant_id, roadmap_id, item_type, title, goal_description,
                          definition_of_done, status, sequencing_mode, target_date,
                          sort_order, strand_project_id, created_at, updated_at
                """,
                (
                    tenant_id,
                    roadmap["id"],
                    item_type,
                    title,
                    goal_description,
                    json.dumps(dod),
                    status,
                    sequencing_mode,
                    target_date,
                    sort_order,
                    strand_project_id,
                ),
            )
            row = _serialize_row(dict(cur.fetchone()))
            row["initiative_id"] = initiative_id
            if item_type not in ("work_cycle", "join_gate"):
                create_default_criterion(
                    cur,
                    tenant_id=tenant_id,
                    roadmap_item_id=row["id"],
                    title=(initial_criterion_title or "Gate allgemein").strip()
                    or "Gate allgemein",
                    description=goal_description or "",
                )
            _sync_milestone_compat_row(
                cur,
                tenant_id=tenant_id,
                initiative_id=initiative_id,
                item=row,
            )
        conn.commit()
    finally:
        conn.close()

    log_audit(
        "roadmap_item.created",
        user_id=user_id,
        tenant_id=tenant_id,
        details={
            "roadmap_item_id": row["id"],
            "initiative_id": initiative_id,
            "item_type": item_type,
            "title": title,
        },
    )
    return row


def update_roadmap_item(
    *,
    tenant_id: str,
    item_id: str,
    user_id: Optional[str] = None,
    title: Optional[str] = None,
    goal_description: Optional[str] = None,
    definition_of_done: Optional[list[Any]] = None,
    item_type: Optional[RoadmapItemType] = None,
    status: Optional[RoadmapItemStatus] = None,
    sequencing_mode: Optional[SequencingMode] = None,
    target_date: Optional[date] = None,
    clear_target_date: bool = False,
    sort_order: Optional[int] = None,
    strand_project_id: Optional[str] = None,
    clear_strand_project: bool = False,
) -> Optional[dict[str, Any]]:
    existing = get_roadmap_item(tenant_id=tenant_id, item_id=item_id)
    if not existing:
        return None

    old_status = existing["status"]
    updates: list[str] = []
    params: list[Any] = []

    if title is not None:
        title = title.strip()
        if not title:
            raise ValueError("Titel ist erforderlich")
        updates.append("title = %s")
        params.append(title)
    if goal_description is not None:
        updates.append("goal_description = %s")
        params.append(goal_description)
    if definition_of_done is not None:
        updates.append("definition_of_done = %s::jsonb")
        params.append(json.dumps(definition_of_done))
    if item_type is not None:
        _validate_item_type(item_type)
        updates.append("item_type = %s")
        params.append(item_type)
    if status is not None:
        _validate_status(status)
        if status in TERMINAL_STATUSES and status == "reached":
            raise ValueError(
                "Status 'reached' nur über verify-reached — nicht direkt setzen"
            )
        if status in ("moved", "discarded"):
            raise ValueError(
                "Status moved/discarded erfordert Decision — noch nicht implementiert"
            )
        updates.append("status = %s")
        params.append(status)
    if sequencing_mode is not None:
        _validate_sequencing_mode(sequencing_mode)
        updates.append("sequencing_mode = %s")
        params.append(sequencing_mode)
    if clear_target_date:
        updates.append("target_date = NULL")
    elif target_date is not None:
        updates.append("target_date = %s")
        params.append(target_date)
    if sort_order is not None:
        updates.append("sort_order = %s")
        params.append(sort_order)
    if clear_strand_project:
        updates.append("strand_project_id = NULL")
    elif strand_project_id is not None:
        updates.append("strand_project_id = %s")
        params.append(strand_project_id)

    if not updates:
        return existing

    updates.append("updated_at = NOW()")
    params.extend([item_id, tenant_id])

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            if (
                status == "active"
                and existing.get("item_type") == "maturity_stage"
            ):
                from services.progression_graph import (
                    enforce_single_active_work_gate_per_strand,
                )

                enforce_single_active_work_gate_per_strand(
                    cur,
                    tenant_id=tenant_id,
                    initiative_id=str(existing["initiative_id"]),
                    keep_active_id=item_id,
                    strand_project_id=strand_project_id
                    if strand_project_id is not None
                    else existing.get("strand_project_id"),
                )
            cur.execute(
                f"""
                UPDATE roadmap_items
                SET {", ".join(updates)}
                WHERE id = %s AND tenant_id = %s
                RETURNING id, tenant_id, roadmap_id, item_type, title, goal_description,
                          definition_of_done, status, sequencing_mode, target_date,
                          sort_order, strand_project_id, created_at, updated_at
                """,
                params,
            )
            row = cur.fetchone()
            if not row:
                return None
            result = _serialize_row(dict(row))
            result["initiative_id"] = existing["initiative_id"]
            _sync_milestone_compat_row(
                cur,
                tenant_id=tenant_id,
                initiative_id=existing["initiative_id"],
                item=result,
            )
        conn.commit()
    finally:
        conn.close()

    log_audit(
        "roadmap_item.updated",
        user_id=user_id,
        tenant_id=tenant_id,
        details={"roadmap_item_id": item_id},
    )
    if status is not None and status != old_status:
        log_audit(
            "roadmap_item.status_changed",
            user_id=user_id,
            tenant_id=tenant_id,
            details={
                "roadmap_item_id": item_id,
                "from_status": old_status,
                "to_status": status,
            },
        )
    return result


def delete_roadmap_item(
    *, tenant_id: str, item_id: str, user_id: Optional[str] = None
) -> bool:
    conn = get_connection()
    try:
        with conn.cursor() as cur:
            cur.execute(
                "DELETE FROM milestones WHERE id = %s AND tenant_id = %s",
                (item_id, tenant_id),
            )
            cur.execute(
                "DELETE FROM roadmap_items WHERE id = %s AND tenant_id = %s RETURNING id",
                (item_id, tenant_id),
            )
            deleted = cur.fetchone() is not None
        conn.commit()
    finally:
        conn.close()

    if deleted:
        log_audit(
            "roadmap_item.deleted",
            user_id=user_id,
            tenant_id=tenant_id,
            details={"roadmap_item_id": item_id},
        )
    return deleted


def _serialize_dependency(row: dict[str, Any]) -> dict[str, Any]:
    dep = dict(row)
    for key in ("id", "tenant_id", "from_item_id", "to_item_id"):
        if dep.get(key):
            dep[key] = str(dep[key])
    if dep.get("created_at"):
        dep["created_at"] = dep["created_at"].isoformat()
    if dep.get("group_key") is None:
        dep.pop("group_key", None)
    return dep


def list_dependencies(*, tenant_id: str, item_id: str) -> list[dict[str, Any]]:
    item = get_roadmap_item(tenant_id=tenant_id, item_id=item_id)
    if not item:
        raise ValueError("RoadmapItem nicht gefunden")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, tenant_id, from_item_id, to_item_id, dependency_type,
                       group_key, created_at
                FROM roadmap_item_dependencies
                WHERE tenant_id = %s AND (from_item_id = %s OR to_item_id = %s)
                ORDER BY created_at ASC
                """,
                (tenant_id, item_id, item_id),
            )
            return [_serialize_dependency(dict(row)) for row in cur.fetchall()]
    finally:
        conn.close()


def list_dependencies_for_initiative(
    *, tenant_id: str, initiative_id: str
) -> list[dict[str, Any]]:
    if not get_initiative(tenant_id=tenant_id, initiative_id=initiative_id):
        raise ValueError("Initiative nicht gefunden")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT d.id, d.tenant_id, d.from_item_id, d.to_item_id,
                       d.dependency_type, d.group_key, d.created_at
                FROM roadmap_item_dependencies d
                INNER JOIN roadmap_items fi
                    ON fi.id = d.from_item_id AND fi.tenant_id = d.tenant_id
                INNER JOIN roadmaps r
                    ON r.id = fi.roadmap_id AND r.tenant_id = fi.tenant_id
                WHERE d.tenant_id = %s AND r.initiative_id = %s
                ORDER BY d.created_at ASC
                """,
                (tenant_id, initiative_id),
            )
            return [_serialize_dependency(dict(row)) for row in cur.fetchall()]
    finally:
        conn.close()


def add_dependency(
    *,
    tenant_id: str,
    from_item_id: str,
    to_item_id: str,
    dependency_type: DependencyType = "requires",
    group_key: Optional[str] = None,
    user_id: Optional[str] = None,
) -> dict[str, Any]:
    _validate_dependency_type(dependency_type)
    if from_item_id == to_item_id:
        raise ValueError("Abhängigkeit auf sich selbst nicht erlaubt")

    from_item = get_roadmap_item(tenant_id=tenant_id, item_id=from_item_id)
    to_item = get_roadmap_item(tenant_id=tenant_id, item_id=to_item_id)
    if not from_item or not to_item:
        raise ValueError("RoadmapItem nicht gefunden")
    if from_item["initiative_id"] != to_item["initiative_id"]:
        raise ValueError("Abhängigkeiten nur innerhalb eines Vorhabens")

    normalized_group_key: Optional[str] = None
    if group_key is not None:
        normalized_group_key = group_key.strip() or None
    if dependency_type == "parallel_group" and not normalized_group_key:
        raise ValueError("group_key ist für parallel_group erforderlich")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT 1 FROM roadmap_item_dependencies
                WHERE tenant_id = %s AND from_item_id = %s AND to_item_id = %s
                  AND dependency_type = %s
                """,
                (tenant_id, from_item_id, to_item_id, dependency_type),
            )
            if cur.fetchone():
                raise ValueError("Abhängigkeit existiert bereits")

            cur.execute(
                """
                INSERT INTO roadmap_item_dependencies (
                    tenant_id, from_item_id, to_item_id, dependency_type, group_key
                )
                VALUES (%s, %s, %s, %s, %s)
                RETURNING id, tenant_id, from_item_id, to_item_id, dependency_type,
                          group_key, created_at
                """,
                (tenant_id, from_item_id, to_item_id, dependency_type, normalized_group_key),
            )
            row = _serialize_dependency(dict(cur.fetchone()))
        conn.commit()
    finally:
        conn.close()

    log_audit(
        "roadmap_item.dependency_added",
        user_id=user_id,
        tenant_id=tenant_id,
        details={
            "from_item_id": from_item_id,
            "to_item_id": to_item_id,
            "dependency_type": dependency_type,
            "group_key": normalized_group_key,
        },
    )
    return row


def delete_dependency(
    *, tenant_id: str, dependency_id: str, user_id: Optional[str] = None
) -> bool:
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, from_item_id, to_item_id, dependency_type
                FROM roadmap_item_dependencies
                WHERE id = %s AND tenant_id = %s
                """,
                (dependency_id, tenant_id),
            )
            row = cur.fetchone()
            if not row:
                raise ValueError("Abhängigkeit nicht gefunden")

            cur.execute(
                """
                DELETE FROM roadmap_item_dependencies
                WHERE id = %s AND tenant_id = %s
                """,
                (dependency_id, tenant_id),
            )
        conn.commit()
    finally:
        conn.close()

    log_audit(
        "roadmap_item.dependency_removed",
        user_id=user_id,
        tenant_id=tenant_id,
        details={
            "dependency_id": dependency_id,
            "from_item_id": str(row["from_item_id"]),
            "to_item_id": str(row["to_item_id"]),
            "dependency_type": row["dependency_type"],
        },
    )
    return True


def verify_reached(
    *, tenant_id: str, item_id: str, user_id: Optional[str] = None
) -> dict[str, Any]:
    """Gate-Verify: reached wenn alle Kriterien erfüllt (satisfied/waived/deferred)."""
    item = get_roadmap_item(tenant_id=tenant_id, item_id=item_id)
    if not item:
        raise ValueError("RoadmapItem nicht gefunden")
    if item["status"] in TERMINAL_STATUSES:
        raise ValueError(f"RoadmapItem bereits terminal: {item['status']}")
    if item.get("item_type") == "join_gate":
        raise ValueError(
            "Join-Knoten schaltet automatisch, wenn alle Eingänge erreicht sind — kein manuelles Verify"
        )

    initiative_id = item["initiative_id"]
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            criteria_ok, criteria_reason = prepare_criteria_for_verify(
                cur,
                tenant_id=tenant_id,
                initiative_id=initiative_id,
                item_id=item_id,
            )
            verify_reason = "criteria_ready"

            if not criteria_ok:
                cur.execute(
                    """
                    SELECT 1 FROM decisions
                    WHERE tenant_id = %s AND initiative_id = %s
                      AND status = 'decided'
                      AND title ILIKE %s
                    LIMIT 1
                    """,
                    (tenant_id, initiative_id, f"gate_override:{item_id}%"),
                )
                if cur.fetchone():
                    verify_reason = "gate_override_decision"
                    criteria_ok = True
                else:
                    raise ValueError(
                        f"Verify fehlgeschlagen — {criteria_reason}. "
                        "Kriterien in der Checkliste prüfen oder Nachweis am Plan-Element einreichen."
                    )
            elif criteria_reason != "no_criteria":
                verify_reason = criteria_reason

            cur.execute(
                """
                UPDATE roadmap_items
                SET status = 'reached', updated_at = NOW()
                WHERE id = %s AND tenant_id = %s
                RETURNING id, tenant_id, roadmap_id, item_type, title, goal_description,
                          definition_of_done, status, sequencing_mode, target_date,
                          sort_order, strand_project_id, created_at, updated_at
                """,
                (item_id, tenant_id),
            )
            row = _serialize_row(dict(cur.fetchone()))
            row["initiative_id"] = initiative_id
            row["verify_reason"] = verify_reason
            _sync_milestone_compat_row(
                cur,
                tenant_id=tenant_id,
                initiative_id=initiative_id,
                item=row,
            )
        conn.commit()
    finally:
        conn.close()

    log_audit(
        "roadmap_item.reached",
        user_id=user_id,
        tenant_id=tenant_id,
        details={"roadmap_item_id": item_id, "verify_reason": verify_reason},
    )
    if row.get("item_type") == "maturity_stage":
        from services.progression_graph import on_work_gate_reached

        transition = on_work_gate_reached(
            tenant_id=tenant_id,
            initiative_id=initiative_id,
            reached_item_id=item_id,
            user_id=user_id,
        )
        if transition:
            row["maturity_transition"] = transition
    elif row.get("item_type") != "work_cycle":
        from services.steering_events import emit_steering_event

        steering = emit_steering_event(
            tenant_id=tenant_id,
            initiative_id=initiative_id,
            event_kind="gate_verified",
            payload={
                "roadmap_item_id": item_id,
                "item_type": row.get("item_type"),
                "verify_reason": verify_reason,
            },
            user_id=user_id,
        )
        row["steering_event"] = {
            "handled": steering.get("handled"),
            "lifecycle_chain": steering.get("lifecycle_chain"),
            "lifecycle_state": steering.get("evaluation", {})
            .get("lifecycle", {})
            .get("current_state"),
        }
    return row


def reopen_roadmap_item(
    *,
    tenant_id: str,
    item_id: str,
    user_id: Optional[str] = None,
    reason: str = "",
) -> dict[str, Any]:
    """Reopen reached → active; Kriterien-Status bleibt unverändert."""
    item = get_roadmap_item(tenant_id=tenant_id, item_id=item_id)
    if not item:
        raise ValueError("RoadmapItem nicht gefunden")
    if item["status"] != "reached":
        raise ValueError("Reopen nur für erreichte Plan-Elemente (status=reached)")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            if item.get("item_type") == "maturity_stage":
                from services.progression_graph import (
                    enforce_single_active_work_gate_per_strand,
                )

                enforce_single_active_work_gate_per_strand(
                    cur,
                    tenant_id=tenant_id,
                    initiative_id=str(item["initiative_id"]),
                    keep_active_id=item_id,
                    strand_project_id=item.get("strand_project_id"),
                )
            cur.execute(
                """
                UPDATE roadmap_items
                SET status = 'active', updated_at = NOW()
                WHERE id = %s AND tenant_id = %s
                RETURNING id, tenant_id, roadmap_id, item_type, title, goal_description,
                          definition_of_done, status, sequencing_mode, target_date,
                          sort_order, strand_project_id, created_at, updated_at
                """,
                (item_id, tenant_id),
            )
            row = _serialize_row(dict(cur.fetchone()))
            row["initiative_id"] = item["initiative_id"]
            _sync_milestone_compat_row(
                cur,
                tenant_id=tenant_id,
                initiative_id=item["initiative_id"],
                item=row,
            )
        conn.commit()
    finally:
        conn.close()

    if row.get("item_type") == "maturity_stage":
        from services.maturity_stage_transition import on_maturity_stage_reopened

        row["maturity_practice"] = on_maturity_stage_reopened(
            tenant_id=tenant_id,
            initiative_id=str(item["initiative_id"]),
            stage_id=item_id,
            user_id=user_id,
        )

    log_audit(
        "roadmap_item.reopened",
        user_id=user_id,
        tenant_id=tenant_id,
        details={
            "roadmap_item_id": item_id,
            "reason": reason.strip() or None,
            "from_status": "reached",
            "to_status": "active",
        },
    )
    if row.get("item_type") != "work_cycle":
        from services.steering_events import emit_steering_event

        steering = emit_steering_event(
            tenant_id=tenant_id,
            initiative_id=str(row["initiative_id"]),
            event_kind="gate_reopened",
            payload={
                "roadmap_item_id": item_id,
                "item_type": row.get("item_type"),
                "reason": reason.strip() or None,
            },
            user_id=user_id,
        )
        row["steering_event"] = {
            "handled": steering.get("handled"),
            "lifecycle_chain": steering.get("lifecycle_chain"),
        }
    return row