"""
Vereins-Mandanten: Mitgliedschaften, aktiver Vereinskontext, einfache Berechtigungen.

Siehe .claude/docs/technical/MULTI_TENANCY_RBAC_ARCHITECTURE.md
"""
from typing import Any, Dict, List, Mapping, Optional, Set, Union

from fastapi import HTTPException

def is_platform_admin(role: Optional[str]) -> bool:
    return (role or "").lower() in ("admin", "superadmin")


def is_superadmin(role: Optional[str]) -> bool:
    return (role or "").lower() == "superadmin"


def club_ids_for_profile(cur, profile_id: int) -> Set[int]:
    cur.execute(
        """
        SELECT club_id FROM club_members
        WHERE profile_id = %s AND status = 'active'
        """,
        (profile_id,),
    )
    return {r["club_id"] for r in cur.fetchall()}


def assert_club_member(cur, profile_id: int, club_id: int) -> None:
    cur.execute(
        """
        SELECT 1 FROM club_members
        WHERE profile_id = %s AND club_id = %s AND status = 'active'
        LIMIT 1
        """,
        (profile_id, club_id),
    )
    if not cur.fetchone():
        raise HTTPException(status_code=403, detail="Keine Mitgliedschaft in diesem Verein")


def has_club_role(cur, profile_id: int, club_id: int, *role_codes: str) -> bool:
    if not role_codes:
        return False
    cur.execute(
        """
        SELECT 1
        FROM club_members cm
        INNER JOIN club_member_roles r ON r.club_member_id = cm.id
        WHERE cm.profile_id = %s AND cm.club_id = %s AND cm.status = 'active'
          AND r.role_code IN ({ph})
        LIMIT 1
        """.format(ph=",".join(["%s"] * len(role_codes))),
        (profile_id, club_id, *role_codes),
    )
    return cur.fetchone() is not None


def club_admin_shares_club_with_creator(
    cur, club_admin_profile_id: int, creator_profile_id: int
) -> bool:
    """
    True, wenn club_admin_profile_id in mindestens einem Verein die Rolle club_admin hat und
    creator_profile_id dort ebenfalls aktives Mitglied ist (z. B. Löschen fremder privater Übungen).
    """
    if club_admin_profile_id == creator_profile_id:
        return False
    cur.execute(
        """
        SELECT 1
        FROM club_members cm_admin
        INNER JOIN club_member_roles r
          ON r.club_member_id = cm_admin.id AND r.role_code = 'club_admin'
        INNER JOIN club_members cm_creator
          ON cm_creator.club_id = cm_admin.club_id
         AND cm_creator.profile_id = %s
         AND cm_creator.status = 'active'
        WHERE cm_admin.profile_id = %s AND cm_admin.status = 'active'
        LIMIT 1
        """,
        (creator_profile_id, club_admin_profile_id),
    )
    return cur.fetchone() is not None


def can_manage_club_org(cur, profile_id: int, club_id: int, global_role: Optional[str]) -> bool:
    """Sparten/Gruppen/Struktur: Vereinsadmin oder Plattform-Admin."""
    if is_platform_admin(global_role):
        return True
    return has_club_role(cur, profile_id, club_id, "club_admin")


def can_plan_in_club(cur, profile_id: int, club_id: int, global_role: Optional[str]) -> bool:
    """Trainingsgruppe anlegen u.Ä.; Vereins-rollentrainer, Content-Editor, Spartenleitung …

    Hinweis: ``content_editor`` ist derzeit zusammen mit ``trainer``/``division_lead`` in diesem
    gemeinsamen Strang gebündelt — u.a. Vereinsübungen bearbeiten (s. exercises) und
    Trainingsgruppen unter ``clubs``. Es gibt noch keine eigene Nur-Content-Guard pro Endpunkt.
    """
    if is_platform_admin(global_role):
        return True
    return has_club_role(
        cur, profile_id, club_id, "club_admin", "trainer", "content_editor", "division_lead"
    )


def memberships_with_roles(cur, profile_id: int, active_only: bool = True) -> List[Dict[str, Any]]:
    status_filter = "AND cm.status = 'active'" if active_only else ""
    cur.execute(
        f"""
        SELECT c.id, c.name, c.abbreviation, c.status,
               cm.status AS membership_status,
               COALESCE(
                   ARRAY_AGG(DISTINCT r.role_code) FILTER (WHERE r.role_code IS NOT NULL),
                   ARRAY[]::varchar[]
               ) AS roles
        FROM club_members cm
        INNER JOIN clubs c ON c.id = cm.club_id
        LEFT JOIN club_member_roles r ON r.club_member_id = cm.id
        WHERE cm.profile_id = %s {status_filter}
        GROUP BY c.id, c.name, c.abbreviation, c.status, cm.status
        ORDER BY c.name
        """,
        (profile_id,),
    )
    out: List[Dict[str, Any]] = []
    for row in cur.fetchall():
        d = dict(row)
        roles = d.get("roles") or []
        if hasattr(roles, "tolist"):
            roles = roles.tolist()
        d["roles"] = list(roles)
        out.append(d)
    return out


def club_ids_for_profile_with_roles(cur, profile_id: int, *role_codes: str) -> Set[int]:
    """Vereins-IDs, in denen das Profil mindestens eine der Rollen hat."""
    if not role_codes:
        return set()
    ph = ",".join(["%s"] * len(role_codes))
    cur.execute(
        f"""
        SELECT DISTINCT cm.club_id
        FROM club_members cm
        INNER JOIN club_member_roles r ON r.club_member_id = cm.id
        WHERE cm.profile_id = %s AND cm.status = 'active'
          AND r.role_code IN ({ph})
        """,
        (profile_id, *role_codes),
    )
    return {int(r["club_id"]) for r in cur.fetchall() if r.get("club_id") is not None}


_GOVERNANCE_VISIBILITY = frozenset({"private", "club", "official"})


def _library_governance_triplet(
    row: Mapping[str, Any],
) -> tuple[str, Optional[int], Optional[int]]:
    """visibility, club_id, created_by als normalisierte Werte für Bibliotheks-/Planungsartefakte."""
    vis = str(row.get("visibility") or "private").strip().lower()
    if vis not in _GOVERNANCE_VISIBILITY:
        vis = "private"
    cid_raw = row.get("club_id")
    try:
        ex_cid = int(cid_raw) if cid_raw is not None else None
    except (TypeError, ValueError):
        ex_cid = None
    cr_raw = row.get("created_by")
    try:
        creator = int(cr_raw) if cr_raw is not None else None
    except (TypeError, ValueError):
        creator = None
    return vis, ex_cid, creator


def assert_library_content_editable(
    cur,
    profile_id: int,
    role: Optional[str],
    row: Union[Dict[str, Any], Mapping[str, Any]],
) -> None:
    """Inhalt bearbeiten: wie Übungen — Ersteller, Plattform-Admin oder Planungsberechtigter im Verein."""
    pid = int(profile_id)
    ex_vis, ex_cid, creator = _library_governance_triplet(row)
    if creator is not None and creator == pid:
        return
    if is_platform_admin(role):
        return
    if ex_vis == "club" and ex_cid is not None and can_plan_in_club(cur, pid, ex_cid, role):
        return
    raise HTTPException(status_code=403, detail="Keine Berechtigung zum Bearbeiten dieses Inhalts")


def assert_library_content_deletable(
    cur,
    profile_id: int,
    role: Optional[str],
    row: Union[Dict[str, Any], Mapping[str, Any]],
) -> None:
    """Löschen: wie Übungen — privat Eigentümer/Vereins-Admin-Kontext, Verein nur Vereinsadmin, offiziell nur Plattform."""
    pid = int(profile_id)
    if is_platform_admin(role):
        return
    vis, cid, creator = _library_governance_triplet(row)
    try:
        creator_int = int(creator) if creator is not None else None
    except (TypeError, ValueError):
        creator_int = None

    if vis == "official":
        raise HTTPException(
            status_code=403,
            detail="Offizielle Inhalte dürfen nur von Plattform-Admins gelöscht werden.",
        )
    if vis == "club":
        try:
            ex_club = int(cid) if cid is not None else None
        except (TypeError, ValueError):
            ex_club = None
        if ex_club is None:
            raise HTTPException(status_code=400, detail="Vereinsinhalt ohne gültige Vereinszuordnung")
        if not has_club_role(cur, pid, ex_club, "club_admin"):
            raise HTTPException(
                status_code=403,
                detail="Nur Vereins-Admins dürfen Vereins-Inhalte löschen.",
            )
        return

    if creator_int is not None and creator_int == pid:
        return
    if creator_int is not None and club_admin_shares_club_with_creator(cur, pid, creator_int):
        return
    raise HTTPException(status_code=403, detail="Keine Berechtigung zum Löschen dieses Inhalts")


def assert_library_content_governance_transition(
    cur,
    profile_id: int,
    role: Optional[str],
    prev_row: Union[Dict[str, Any], Mapping[str, Any]],
    next_visibility: str,
    next_club_id: Optional[int],
) -> None:
    """
    Zusätzliche Regeln beim Ändern von visibility/club_id (Zielzustand vor assert_valid_governance_visibility prüfen).

    - Abwahl „official“: nur Plattform-Admin.
    - private → club: nur Ersteller (oder Plattform-Admin).
    - club → private: Ersteller, Vereinsadmin im bisherigen Verein oder Plattform-Admin.
    - club → club mit Wechsel club_id: Vereinsadmin im alten oder neuen Verein oder Plattform-Admin.
    """
    nv = str(next_visibility or "").strip().lower()
    if nv not in _GOVERNANCE_VISIBILITY:
        raise HTTPException(status_code=400, detail="Ungültige visibility")

    old_vis, old_cid, creator = _library_governance_triplet(prev_row)
    new_cid: Optional[int]
    try:
        new_cid = int(next_club_id) if next_club_id is not None else None
    except (TypeError, ValueError):
        new_cid = None

    pid = int(profile_id)
    try:
        creator_int = int(creator) if creator is not None else None
    except (TypeError, ValueError):
        creator_int = None

    if old_vis == nv and (nv != "club" or old_cid == new_cid):
        return

    if old_vis == "official" and nv != "official":
        if not is_platform_admin(role):
            raise HTTPException(
                status_code=403,
                detail="Nur Plattform-Admins dürfen offizielle Inhalte auf Verein oder privat setzen.",
            )

    if nv == "official":
        return

    if old_vis == "private" and nv == "club":
        if creator_int is not None and creator_int != pid and not is_platform_admin(role):
            raise HTTPException(
                status_code=403,
                detail="Nur der Ersteller darf private Inhalte für den Verein freigeben.",
            )
        return

    if old_vis == "club" and nv == "private":
        if is_platform_admin(role):
            return
        if creator_int is not None and creator_int == pid:
            return
        if old_cid is not None and has_club_role(cur, pid, old_cid, "club_admin"):
            return
        raise HTTPException(
            status_code=403,
            detail="Nur Ersteller, Vereins-Admins oder Plattform-Admins dürfen Vereins-Inhalte auf privat setzen.",
        )

    if old_vis == "club" and nv == "club" and old_cid != new_cid:
        if is_platform_admin(role):
            return
        ok_old = old_cid is not None and has_club_role(cur, pid, old_cid, "club_admin")
        ok_new = new_cid is not None and has_club_role(cur, pid, new_cid, "club_admin")
        if ok_old or ok_new:
            return
        raise HTTPException(
            status_code=403,
            detail="Nur Vereins-Admins oder Plattform-Admins dürfen die Vereinszuordnung ändern.",
        )


def assert_valid_governance_visibility(
    cur,
    profile_id: int,
    role: Optional[str],
    visibility: str,
    club_id: Optional[int],
) -> None:
    """Pflicht club_id bei visibility=club; Mitgliedschaft außer Plattform-Admin; official nur Superadmin."""
    if visibility not in _GOVERNANCE_VISIBILITY:
        raise HTTPException(status_code=400, detail="Ungültige visibility")
    if visibility == "official" and not is_superadmin(role):
        raise HTTPException(
            status_code=403,
            detail="Nur Superadmins dürfen offizielle Inhalte setzen",
        )
    if visibility == "club":
        if club_id is None:
            raise HTTPException(status_code=400, detail="club_id ist bei visibility=club erforderlich")
        if is_platform_admin(role):
            cur.execute("SELECT 1 FROM clubs WHERE id = %s", (club_id,))
            if not cur.fetchone():
                raise HTTPException(status_code=400, detail="Verein nicht gefunden")
        else:
            assert_club_member(cur, profile_id, club_id)


def library_content_visible_to_profile(
    cur,
    profile_id: int,
    visibility: str,
    content_club_id: Optional[int],
    created_by: Optional[int],
    global_role: Optional[str],
) -> bool:
    """Leserechte wie Übungen für alle Objekte mit visibility/club_id/created_by (Bibliothek & Co.)."""
    return exercise_visible_to_profile(
        cur, profile_id, visibility, content_club_id, created_by, global_role
    )


def exercise_visible_to_profile(
    cur,
    profile_id: int,
    visibility: str,
    exercise_club_id: Optional[int],
    created_by: Optional[int],
    global_role: Optional[str],
) -> bool:
    """
    Leserechte einer Übung (und analoger Bibliotheksobjekte).

    Vereinsbezogene Inhalte (visibility club): aktiv nur mit **aktiver** Mitgliedschaft in diesem Verein.
    Mitgliedschaft mit status **inactive** sperrt — auch für Plattform-/Super-Admins — solange eine
    Mitgliedschaft existiert.

    Ist man kein Mitglied dieses Vereins, behalten Plattform-Admins den bisherigen „Audit“-Zugang
    zum Vereinskontext ohne eigene Mitgliedschaft.
    """
    vis = (visibility or "").strip().lower()
    plat = is_platform_admin(global_role)
    pid = int(profile_id)

    if vis == "official":
        return True
    if created_by is not None and int(created_by) == pid:
        return True
    if vis == "private":
        return plat
    if vis != "club":
        return False
    if exercise_club_id is None:
        return False
    try:
        ecid = int(exercise_club_id)
    except (TypeError, ValueError):
        return False
    cur.execute(
        """
        SELECT cm.status
        FROM club_members cm
        WHERE cm.profile_id = %s AND cm.club_id = %s
        LIMIT 1
        """,
        (pid, ecid),
    )
    row = cur.fetchone()
    if row is None:
        return plat
    st_raw = row["status"] if isinstance(row, dict) else row[0]
    return str(st_raw or "active").strip().lower() == "active"