"""
Vollständiger Export/Import: Fähigkeitskatalog (Haupt-/Unterkategorien, Skills, Level-Definitionen),
Reifegradmodelle inkl. Kontext-M:N und Kontext-Bindings.

Ziel: Test → Prod; IDs werden über Slugs/Namen aufgelöst, nicht 1:1 übernommen.
"""
from __future__ import annotations

import json
import re
import uuid
from datetime import datetime, timezone
from typing import Any, Dict, List, Optional, Tuple

from fastapi import APIRouter, Body, Depends, HTTPException
from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse

from auth import require_auth
from db import get_db, get_cursor, r2d

router = APIRouter(prefix="/api/admin/matrix-stack", tags=["admin_matrix_stack"])

KIND_V1 = "shinkan.matrix_stack.v1"


def _require_admin(session: dict) -> None:
    role = session.get("role")
    if role not in ("admin", "superadmin"):
        raise HTTPException(403, "Nur Administratoren")


def _keywords_param(raw: Any) -> Any:
    if raw is None:
        return None
    if isinstance(raw, str):
        return raw
    return json.dumps(raw)


def _slugify_label(text: str) -> str:
    t = (text or "").strip().lower()
    t = re.sub(r"[^a-z0-9äöüß]+", "_", t, flags=re.IGNORECASE)
    t = re.sub(r"_+", "_", t).strip("_")
    return (t[:48] or "gruppe")


def _jsonable(val: Any) -> Any:
    if val is None:
        return None
    if hasattr(val, "isoformat"):
        try:
            return val.isoformat()
        except Exception:
            return str(val)
    return val


def _sort_categories_topo(rows: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
    by_id = {int(r["id"]): r for r in rows}
    children: Dict[Optional[int], List[int]] = {}
    for r in rows:
        pid = r.get("parent_category_id")
        pk = int(pid) if pid is not None else None
        children.setdefault(pk, []).append(int(r["id"]))

    out: List[Dict[str, Any]] = []
    seen = set()

    def visit(cid: int) -> None:
        if cid in seen:
            return
        seen.add(cid)
        out.append(by_id[cid])
        for ch in sorted(children.get(cid, [])):
            visit(ch)

    roots = sorted(children.get(None, []))
    for root_id in roots:
        visit(root_id)
    # Zyklen / verwaiste Knoten
    for r in rows:
        rid = int(r["id"])
        if rid not in seen:
            visit(rid)
    return out


def _catalog_name_maps(cur) -> Tuple[Dict[str, int], Dict[str, int], Dict[str, int], Dict[str, int]]:
    cur.execute("SELECT id, name FROM focus_areas")
    fa = {r["name"].strip(): int(r["id"]) for r in cur.fetchall() if r.get("name")}

    cur.execute("SELECT id, name FROM style_directions")
    sd = {r["name"].strip(): int(r["id"]) for r in cur.fetchall() if r.get("name")}

    cur.execute("SELECT id, name FROM training_types")
    tt = {r["name"].strip(): int(r["id"]) for r in cur.fetchall() if r.get("name")}

    cur.execute("SELECT id, name FROM target_groups")
    tg = {r["name"].strip(): int(r["id"]) for r in cur.fetchall() if r.get("name")}

    return fa, sd, tt, tg


def export_matrix_stack_v1(session: dict = Depends(require_auth)) -> JSONResponse:
    _require_admin(session)
    export_uid = str(uuid.uuid4())
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            """
            SELECT * FROM skill_main_categories
            ORDER BY sort_order NULLS LAST, name
            """
        )
        main_cats = [r2d(r) for r in cur.fetchall()]

        cur.execute("SELECT * FROM skill_categories ORDER BY sort_order NULLS LAST, name")
        raw_cats = [r2d(r) for r in cur.fetchall()]
        skill_categories = _sort_categories_topo(raw_cats)

        cur.execute(
            """
            SELECT s.*,
                   mc.slug AS _export_main_category_slug,
                   sc.slug AS _export_category_slug,
                   pfa.name AS _export_primary_focus_area_name
            FROM skills s
            LEFT JOIN skill_main_categories mc ON s.main_category_id = mc.id
            LEFT JOIN skill_categories sc ON s.category_id = sc.id
            LEFT JOIN focus_areas pfa ON s.primary_focus_area_id = pfa.id
            ORDER BY mc.sort_order NULLS LAST, sc.sort_order NULLS LAST, s.sort_order NULLS LAST, s.name
            """
        )
        skills = [r2d(r) for r in cur.fetchall()]

        cur.execute(
            """
            SELECT sld.* FROM skill_level_definitions sld
            JOIN skills s ON s.id = sld.skill_id
            ORDER BY s.name, sld.level
            """
        )
        skill_level_definitions = [r2d(r) for r in cur.fetchall()]

        cur.execute("SELECT * FROM maturity_models ORDER BY id")
        maturity_models_raw = [r2d(r) for r in cur.fetchall()]

        maturity_blocks: List[Dict[str, Any]] = []
        for m in maturity_models_raw:
            mid = int(m["id"])
            cur.execute(
                """
                SELECT fa.name, mfa.is_primary
                FROM maturity_model_focus_areas mfa
                JOIN focus_areas fa ON fa.id = mfa.focus_area_id
                WHERE mfa.maturity_model_id = %s
                ORDER BY mfa.is_primary DESC NULLS LAST, fa.sort_order, fa.name
                """,
                (mid,),
            )
            fa_rows = [r2d(r) for r in cur.fetchall()]
            cur.execute(
                """
                SELECT sd.name, msd.is_primary
                FROM maturity_model_style_directions msd
                JOIN style_directions sd ON sd.id = msd.style_direction_id
                WHERE msd.maturity_model_id = %s
                ORDER BY msd.is_primary DESC NULLS LAST, sd.name
                """,
                (mid,),
            )
            sd_rows = [r2d(r) for r in cur.fetchall()]
            cur.execute(
                """
                SELECT tg.name, mtg.is_primary
                FROM maturity_model_target_groups mtg
                JOIN target_groups tg ON tg.id = mtg.target_group_id
                WHERE mtg.maturity_model_id = %s
                ORDER BY mtg.is_primary DESC NULLS LAST, tg.name
                """,
                (mid,),
            )
            tg_rows = [r2d(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT * FROM model_levels
                WHERE maturity_model_id = %s
                ORDER BY sort_order ASC, level_number ASC
                """,
                (mid,),
            )
            levels = [r2d(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT ms.skill_id, ms.sort_order, ms.relevance
                FROM model_skills ms
                WHERE ms.maturity_model_id = %s
                ORDER BY ms.sort_order ASC, ms.id ASC
                """,
                (mid,),
            )
            model_skills = [r2d(r) for r in cur.fetchall()]

            cur.execute(
                """
                SELECT msl.skill_id, msl.level_number, msl.description, msl.observable_criteria,
                       msl.example_exercise_hints, msl.ai_generated
                FROM model_skill_levels msl
                WHERE msl.maturity_model_id = %s
                ORDER BY msl.skill_id, msl.level_number
                """,
                (mid,),
            )
            skill_levels = [r2d(r) for r in cur.fetchall()]

            row = {k: _jsonable(v) for k, v in m.items()}
            for drop in ("created_at", "updated_at"):
                row.pop(drop, None)

            maturity_blocks.append(
                {
                    "source_id": mid,
                    "model": row,
                    "legacy_focus_areas": fa_rows,
                    "legacy_style_directions": sd_rows,
                    "legacy_target_groups": tg_rows,
                    "levels": levels,
                    "model_skills": model_skills,
                    "skill_levels": skill_levels,
                }
            )

        cur.execute(
            """
            SELECT b.maturity_model_id AS maturity_model_source_id,
                   fa.name AS focus_area_name,
                   sd.name AS style_direction_name,
                   tt.name AS training_type_name
            FROM maturity_model_context_bindings b
            JOIN focus_areas fa ON fa.id = b.focus_area_id
            LEFT JOIN style_directions sd ON sd.id = b.style_direction_id
            LEFT JOIN training_types tt ON tt.id = b.training_type_id
            ORDER BY fa.sort_order, fa.name, sd.name NULLS LAST, tt.name NULLS LAST
            """
        )
        context_bindings = [r2d(r) for r in cur.fetchall()]

    bundle = {
        "kind": KIND_V1,
        "export_version": 1,
        "bundle_export_id": export_uid,
        "exported_at": datetime.now(timezone.utc).isoformat(),
        "skill_main_categories": main_cats,
        "skill_categories": skill_categories,
        "skills": skills,
        "skill_level_definitions": skill_level_definitions,
        "maturity_models": maturity_blocks,
        "context_bindings": context_bindings,
    }
    return JSONResponse(
        content=jsonable_encoder(bundle),
        headers={
            "Content-Disposition": f'attachment; filename="matrix-stack-{export_uid[:8]}.json"'
        },
    )


def _upsert_main_category(cur, row: Dict[str, Any]) -> int:
    name = (row.get("name") or "").strip()
    slug = (row.get("slug") or "").strip() or _slugify_label(name)
    if not name:
        raise HTTPException(400, "skill_main_categories: name fehlt")
    cur.execute(
        """
        INSERT INTO skill_main_categories (name, slug, description, sort_order)
        VALUES (%s, %s, %s, %s)
        ON CONFLICT (slug) DO UPDATE SET
            name = EXCLUDED.name,
            description = EXCLUDED.description,
            sort_order = EXCLUDED.sort_order,
            updated_at = NOW()
        RETURNING id
        """,
        (name, slug, row.get("description"), row.get("sort_order")),
    )
    return int(cur.fetchone()["id"])


def _upsert_skill_category(
    cur,
    row: Dict[str, Any],
    main_id_map: Dict[int, int],
    cat_id_map: Dict[int, int],
) -> Tuple[int, int]:
    """Returns (old_id, new_id)."""
    old_id = int(row["id"])
    name = (row.get("name") or "").strip()
    slug = (row.get("slug") or "").strip() or _slugify_label(name)
    if not name:
        raise HTTPException(400, f"skill_categories id={old_id}: name fehlt")
    old_main = row.get("main_category_id")
    new_main = main_id_map.get(int(old_main)) if old_main is not None else None
    old_parent = row.get("parent_category_id")
    new_parent = cat_id_map.get(int(old_parent)) if old_parent is not None else None

    cur.execute(
        """
        INSERT INTO skill_categories (
            name, slug, description, parent_category_id, main_category_id, sort_order, status
        )
        VALUES (%s, %s, %s, %s, %s, %s, %s)
        ON CONFLICT (slug) DO UPDATE SET
            name = EXCLUDED.name,
            description = EXCLUDED.description,
            parent_category_id = EXCLUDED.parent_category_id,
            main_category_id = EXCLUDED.main_category_id,
            sort_order = EXCLUDED.sort_order,
            status = EXCLUDED.status,
            updated_at = NOW()
        RETURNING id
        """,
        (
            name,
            slug,
            row.get("description"),
            new_parent,
            new_main,
            row.get("sort_order"),
            row.get("status") or "active",
        ),
    )
    new_id = int(cur.fetchone()["id"])
    return old_id, new_id


def import_matrix_stack_v1(
    data: Dict[str, Any] = Body(...),
    session: dict = Depends(require_auth),
) -> Dict[str, Any]:
    _require_admin(session)
    if data.get("kind") != KIND_V1:
        raise HTTPException(400, f"kind muss {KIND_V1} sein")

    replace_all = bool(data.get("replace_all_maturity_models"))
    confirm = (data.get("confirm_replace_all") or "").strip()
    if replace_all and confirm != "DELETE_MATURITY_STACK":
        raise HTTPException(
            400,
            'replace_all_maturity_models erfordert confirm_replace_all: "DELETE_MATURITY_STACK"',
        )
    if replace_all and session.get("role") != "superadmin":
        raise HTTPException(403, "replace_all_maturity_models nur für Superadmins")

    profile_id = session.get("profile_id")
    warnings: List[str] = []

    main_rows = data.get("skill_main_categories") or []
    cat_rows = _sort_categories_topo(list(data.get("skill_categories") or []))
    skill_rows = data.get("skills") or []
    sld_rows = data.get("skill_level_definitions") or []
    model_blocks = data.get("maturity_models") or []
    bind_rows = data.get("context_bindings") or []

    skill_id_map: Dict[int, int] = {}
    model_id_map: Dict[int, int] = {}

    with get_db() as conn:
        cur = get_cursor(conn)
        fa_by_name, sd_by_name, tt_by_name, tg_by_name = _catalog_name_maps(cur)

        # ── Katalog: Hauptkategorien ──
        main_id_map: Dict[int, int] = {}
        for mc in main_rows:
            old = int(mc["id"])
            main_id_map[old] = _upsert_main_category(cur, mc)

        # ── Katalog: Unterkategorien (mehrere Durchläufe für Parent-Kette) ──
        cat_id_map: Dict[int, int] = {}
        remaining = list(cat_rows)
        guard = 0
        while remaining and guard < len(cat_rows) + 5:
            guard += 1
            next_pass: List[Dict[str, Any]] = []
            for row in remaining:
                old_parent = row.get("parent_category_id")
                if old_parent is not None and int(old_parent) not in cat_id_map:
                    next_pass.append(row)
                    continue
                old_id, new_id = _upsert_skill_category(cur, row, main_id_map, cat_id_map)
                cat_id_map[old_id] = new_id
            remaining = next_pass
        if remaining:
            raise HTTPException(400, "skill_categories: Parent-Auflösung fehlgeschlagen (Zyklus?)")

        # ── Skills ──
        slug_to_cat_id = {}
        cur.execute("SELECT id, slug FROM skill_categories WHERE slug IS NOT NULL")
        for r in cur.fetchall():
            slug_to_cat_id[r["slug"]] = int(r["id"])

        main_slug_to_id = {}
        cur.execute("SELECT id, slug FROM skill_main_categories")
        for r in cur.fetchall():
            main_slug_to_id[r["slug"]] = int(r["id"])

        for s in skill_rows:
            old_sid = int(s["id"])
            name = (s.get("name") or "").strip()
            if not name:
                raise HTTPException(400, f"Skill id={old_sid}: name fehlt")

            cat_slug = s.get("_export_category_slug")
            main_slug = s.get("_export_main_category_slug")
            cat_id = None
            main_id = None
            if cat_slug:
                cat_id = slug_to_cat_id.get(cat_slug)
            if cat_id is None and s.get("category_id") is not None:
                cat_id = cat_id_map.get(int(s["category_id"]))
            if main_slug:
                main_id = main_slug_to_id.get(main_slug)
            if main_id is None and s.get("main_category_id") is not None:
                main_id = main_id_map.get(int(s["main_category_id"]))

            pfa_name = s.get("_export_primary_focus_area_name")
            pfa_id = None
            if pfa_name:
                pfa_id = fa_by_name.get(str(pfa_name).strip())
                if pfa_id is None:
                    warnings.append(f"primary_focus_area „{pfa_name}“ für Skill „{name}“ nicht gefunden")

            focus_json = s.get("focus_areas")
            if isinstance(focus_json, (dict, list)):
                focus_json = json.dumps(focus_json)
            elif focus_json is None:
                focus_json = "[]"

            cur.execute(
                """
                SELECT id FROM skills
                WHERE category_id IS NOT DISTINCT FROM %s AND name = %s
                LIMIT 1
                """,
                (cat_id, name),
            )
            ex = cur.fetchone()
            if ex:
                new_sid = int(ex["id"])
                cur.execute(
                    """
                    UPDATE skills SET
                        category = %s,
                        description = %s,
                        importance = %s,
                        keywords = %s,
                        status = COALESCE(%s, status),
                        main_category_id = COALESCE(%s, main_category_id),
                        category_id = COALESCE(%s, category_id),
                        focus_areas = %s::jsonb,
                        sort_order = COALESCE(%s, sort_order),
                        primary_focus_area_id = COALESCE(%s, primary_focus_area_id),
                        is_cross_domain = COALESCE(%s, is_cross_domain),
                        level = COALESCE(%s, level),
                        parent_skill_id = COALESCE(%s, parent_skill_id),
                        updated_at = NOW()
                    WHERE id = %s
                    """,
                    (
                        s.get("category"),
                        s.get("description"),
                        s.get("importance"),
                        _keywords_param(s.get("keywords")),
                        s.get("status"),
                        main_id,
                        cat_id,
                        focus_json,
                        s.get("sort_order"),
                        pfa_id,
                        s.get("is_cross_domain"),
                        s.get("level"),
                        None,
                        new_sid,
                    ),
                )
            else:
                cur.execute(
                    """
                    INSERT INTO skills (
                        name, category, description, importance, keywords, status,
                        category_id, main_category_id, focus_areas, sort_order,
                        primary_focus_area_id, is_cross_domain, level
                    )
                    VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s::jsonb,%s,%s,%s,%s)
                    RETURNING id
                    """,
                    (
                        name,
                        s.get("category"),
                        s.get("description"),
                        s.get("importance"),
                        _keywords_param(s.get("keywords")),
                        s.get("status") or "active",
                        cat_id,
                        main_id,
                        focus_json,
                        s.get("sort_order"),
                        pfa_id,
                        s.get("is_cross_domain"),
                        s.get("level"),
                    ),
                )
                new_sid = int(cur.fetchone()["id"])
            skill_id_map[old_sid] = new_sid

        # parent_skill_id zweite Runde
        for s in skill_rows:
            old_sid = int(s["id"])
            ps = s.get("parent_skill_id")
            if ps is None:
                continue
            new_sid = skill_id_map.get(old_sid)
            new_parent = skill_id_map.get(int(ps))
            if new_sid and new_parent:
                cur.execute(
                    "UPDATE skills SET parent_skill_id = %s WHERE id = %s",
                    (new_parent, new_sid),
                )

        # skill_level_definitions
        for sld in sld_rows:
            old_sk = int(sld["skill_id"])
            new_sk = skill_id_map.get(old_sk)
            if not new_sk:
                warnings.append(f"skill_level_definitions: Skill {old_sk} nicht gemappt, übersprungen")
                continue
            lvl = int(sld["level"])
            cur.execute(
                """
                INSERT INTO skill_level_definitions (skill_id, level, description)
                VALUES (%s, %s, %s)
                ON CONFLICT (skill_id, level) DO UPDATE SET
                    description = EXCLUDED.description,
                    updated_at = NOW()
                """,
                (new_sk, lvl, sld.get("description") or ""),
            )

        if replace_all:
            cur.execute("DELETE FROM maturity_models")

        for block in model_blocks:
            src_mid = int(block["source_id"])
            mrow = dict(block.get("model") or {})
            for drop in ("id", "created_at", "updated_at"):
                mrow.pop(drop, None)
            lc = int(mrow.get("level_count") or 5)
            if lc < 3 or lc > 10:
                raise HTTPException(400, "level_count ungültig")

            cur.execute(
                """
                INSERT INTO maturity_models (
                    name, description, level_count, status, version,
                    created_by, import_source, import_id, club_id
                )
                VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s)
                RETURNING id
                """,
                (
                    (mrow.get("name") or "").strip() or "Importiertes Modell",
                    mrow.get("description"),
                    lc,
                    mrow.get("status") or "draft",
                    mrow.get("version") or "1.0",
                    profile_id,
                        mrow.get("import_source") or "matrix_stack_v1",
                        mrow.get("import_id") or f"stack:{data.get('bundle_export_id') or 'na'}:{src_mid}",
                        None,
                    ),
                )
            new_mid = int(cur.fetchone()["id"])
            model_id_map[src_mid] = new_mid

            for fa in block.get("legacy_focus_areas") or []:
                nm = (fa.get("name") or "").strip()
                fid = fa_by_name.get(nm)
                if fid is None:
                    warnings.append(f"Modell {mrow.get('name')}: Fokus „{nm}“ unbekannt")
                    continue
                cur.execute(
                    """
                    INSERT INTO maturity_model_focus_areas (maturity_model_id, focus_area_id, is_primary)
                    VALUES (%s, %s, %s)
                    ON CONFLICT (maturity_model_id, focus_area_id) DO NOTHING
                    """,
                    (new_mid, fid, bool(fa.get("is_primary"))),
                )
            for sd in block.get("legacy_style_directions") or []:
                nm = (sd.get("name") or "").strip()
                sid = sd_by_name.get(nm)
                if sid is None:
                    warnings.append(f"Modell {mrow.get('name')}: Stilrichtung „{nm}“ unbekannt")
                    continue
                cur.execute(
                    """
                    INSERT INTO maturity_model_style_directions (maturity_model_id, style_direction_id, is_primary)
                    VALUES (%s, %s, %s)
                    ON CONFLICT (maturity_model_id, style_direction_id) DO NOTHING
                    """,
                    (new_mid, sid, bool(sd.get("is_primary"))),
                )
            for tg in block.get("legacy_target_groups") or []:
                nm = (tg.get("name") or "").strip()
                tid = tg_by_name.get(nm)
                if tid is None:
                    warnings.append(f"Modell {mrow.get('name')}: Zielgruppe „{nm}“ unbekannt")
                    continue
                cur.execute(
                    """
                    INSERT INTO maturity_model_target_groups (maturity_model_id, target_group_id, is_primary)
                    VALUES (%s, %s, %s)
                    ON CONFLICT (maturity_model_id, target_group_id) DO NOTHING
                    """,
                    (new_mid, tid, bool(tg.get("is_primary"))),
                )

            for lev in block.get("levels") or []:
                cur.execute(
                    """
                    INSERT INTO model_levels (maturity_model_id, level_number, name, description, sort_order)
                    VALUES (%s, %s, %s, %s, %s)
                    """,
                    (
                        new_mid,
                        int(lev["level_number"]),
                        (lev.get("name") or f"Stufe {lev['level_number']}").strip(),
                        lev.get("description"),
                        int(lev.get("sort_order") or lev["level_number"]),
                    ),
                )

            for ms in block.get("model_skills") or []:
                old_sk = int(ms["skill_id"])
                new_sk = skill_id_map.get(old_sk)
                if not new_sk:
                    raise HTTPException(400, f"Modell {mrow.get('name')}: unbekannte skill_id {old_sk}")
                cur.execute(
                    """
                    INSERT INTO model_skills (maturity_model_id, skill_id, sort_order, relevance)
                    VALUES (%s, %s, %s, %s)
                    ON CONFLICT (maturity_model_id, skill_id) DO UPDATE SET
                        sort_order = EXCLUDED.sort_order,
                        relevance = EXCLUDED.relevance
                    """,
                    (new_mid, new_sk, int(ms.get("sort_order") or 0), ms.get("relevance")),
                )

            for sl in block.get("skill_levels") or []:
                old_sk = int(sl["skill_id"])
                new_sk = skill_id_map.get(old_sk)
                if not new_sk:
                    continue
                ln = int(sl["level_number"])
                desc = (sl.get("description") or "").strip()
                if not desc:
                    continue
                cur.execute(
                    """
                    INSERT INTO model_skill_levels (
                        maturity_model_id, skill_id, level_number,
                        description, observable_criteria, example_exercise_hints, ai_generated
                    )
                    VALUES (%s,%s,%s,%s,%s,%s,%s)
                    ON CONFLICT (maturity_model_id, skill_id, level_number)
                    DO UPDATE SET
                        description = EXCLUDED.description,
                        observable_criteria = EXCLUDED.observable_criteria,
                        example_exercise_hints = EXCLUDED.example_exercise_hints,
                        ai_generated = EXCLUDED.ai_generated,
                        updated_at = NOW()
                    """,
                    (
                        new_mid,
                        new_sk,
                        ln,
                        desc,
                        sl.get("observable_criteria"),
                        sl.get("example_exercise_hints"),
                        sl.get("ai_generated"),
                    ),
                )

        for b in bind_rows:
            src_m = int(b["maturity_model_source_id"])
            new_m = model_id_map.get(src_m)
            if not new_m:
                warnings.append(f"Binding: Modell-Quell-ID {src_m} nicht gefunden, übersprungen")
                continue
            fa_n = (b.get("focus_area_name") or "").strip()
            fa_id = fa_by_name.get(fa_n)
            if fa_id is None:
                warnings.append(f"Binding: Fokus „{fa_n}“ unbekannt")
                continue
            sd_n = b.get("style_direction_name")
            sd_id = None
            if sd_n:
                sd_id = sd_by_name.get(str(sd_n).strip())
                if sd_id is None:
                    warnings.append(f"Binding: Stil „{sd_n}“ unbekannt")
                    continue
            tt_n = b.get("training_type_name")
            tt_id = None
            if tt_n:
                tt_id = tt_by_name.get(str(tt_n).strip())
                if tt_id is None:
                    warnings.append(f"Binding: Trainingsstil „{tt_n}“ unbekannt")
                    continue

            if sd_id is None and tt_id is None:
                cur.execute(
                    """
                    DELETE FROM maturity_model_context_bindings
                    WHERE focus_area_id = %s AND style_direction_id IS NULL AND training_type_id IS NULL
                    """,
                    (fa_id,),
                )
            elif sd_id is not None and tt_id is None:
                cur.execute(
                    """
                    DELETE FROM maturity_model_context_bindings
                    WHERE focus_area_id = %s AND style_direction_id = %s AND training_type_id IS NULL
                    """,
                    (fa_id, sd_id),
                )
            elif sd_id is None and tt_id is not None:
                cur.execute(
                    """
                    DELETE FROM maturity_model_context_bindings
                    WHERE focus_area_id = %s AND style_direction_id IS NULL AND training_type_id = %s
                    """,
                    (fa_id, tt_id),
                )
            else:
                cur.execute(
                    """
                    DELETE FROM maturity_model_context_bindings
                    WHERE focus_area_id = %s AND style_direction_id = %s AND training_type_id = %s
                    """,
                    (fa_id, sd_id, tt_id),
                )
            cur.execute(
                """
                INSERT INTO maturity_model_context_bindings (
                    maturity_model_id, focus_area_id, style_direction_id, training_type_id
                )
                VALUES (%s, %s, %s, %s)
                """,
                (new_m, fa_id, sd_id, tt_id),
            )

    return {
        "ok": True,
        "skill_id_map": {str(k): v for k, v in skill_id_map.items()},
        "model_id_map": {str(k): v for k, v in model_id_map.items()},
        "warnings": warnings,
    }


router.add_api_route("/export", export_matrix_stack_v1, methods=["GET"])
router.add_api_route("/import", import_matrix_stack_v1, methods=["POST"])