"""Админ: аутентификация (логин=ник + пароль) и управление сущностями."""
from __future__ import annotations

from typing import Any

from sqlmodel import Session, select

from app.core.errors import InvalidCredentialsError, NotFoundError, ValidationError
from app.core.security import verify_password
from app.core.timeutil import iso_utc
from app.models import AuditLog, Faction, Group, Match, MatchParticipant, User


def authenticate_admin(session: Session, username: str, password: str) -> User:
    user = session.exec(
        select(User).where(
            User.nickname == username,
            User.role == "admin",
            User.auth_provider == "local",
            User.is_active == True,  # noqa: E712
        )
    ).first()
    if user is None or not user.password_hash or not verify_password(password, user.password_hash):
        raise InvalidCredentialsError()
    return user


# ─── Пользователи ────────────────────────────────────────────────────────────

def list_users(session: Session, query: str | None = None) -> list[User]:
    stmt = select(User).order_by(User.created_at.desc())
    if query:
        stmt = stmt.where(User.nickname.contains(query))
    return list(session.exec(stmt).all())


def update_user(session: Session, user_id: int, *, nickname: str | None = None, is_active: bool | None = None) -> User:
    user = session.get(User, user_id)
    if user is None:
        raise NotFoundError("Пользователь не найден.")
    if nickname is not None:
        user.nickname = nickname.strip()
    if is_active is not None:
        user.is_active = is_active
    session.add(user)
    session.commit()
    session.refresh(user)
    return user


# Жёсткое удаление пользователя — dev-only, в services/admin_service нет намеренно:
# логика вынесена в routers/dev_admin.py (файл исключён из прод/тест-образа).


# ─── Группы ──────────────────────────────────────────────────────────────────

def list_groups(session: Session) -> list[Group]:
    return list(session.exec(select(Group).order_by(Group.created_at.desc())).all())


def delete_group(session: Session, group_id: int) -> None:
    group = session.get(Group, group_id)
    if group is None:
        raise NotFoundError("Группа не найдена.")
    session.delete(group)
    session.commit()


# ─── Партии ──────────────────────────────────────────────────────────────────

def list_matches(
    session: Session,
    limit: int = 200,
    offset: int = 0,
    group_id: int | None = None,
    user_id: int | None = None,
    faction_id: int | None = None,
) -> list[tuple[Match, str]]:
    """Возвращает партии вместе с названием группы (для группировки в админке).

    Фильтры: по группе, по игроку-участнику, по фракции участника.
    """
    stmt = (
        select(Match, Group.name)
        .join(Group, Group.id == Match.group_id)
        .order_by(Match.group_id, Match.played_at.desc(), Match.id.desc())
    )
    if group_id is not None:
        stmt = stmt.where(Match.group_id == group_id)
    if user_id is not None:
        stmt = stmt.where(
            Match.id.in_(
                select(MatchParticipant.match_id).where(MatchParticipant.user_id == user_id)
            )
        )
    if faction_id is not None:
        stmt = stmt.where(
            Match.id.in_(
                select(MatchParticipant.match_id).where(
                    MatchParticipant.faction_id == faction_id
                )
            )
        )
    rows = session.exec(stmt.offset(offset).limit(limit)).all()
    return [(mt, gname) for mt, gname in rows]


def rename_faction(session: Session, faction_id: int, name_ru: str) -> Faction:
    """Переименовывает фракцию во всей системе (имя хранится один раз)."""
    name_ru = (name_ru or "").strip()
    if not (1 <= len(name_ru) <= 64):
        raise ValidationError("Название фракции: 1–64 символа.")
    faction = session.get(Faction, faction_id)
    if faction is None:
        raise NotFoundError("Фракция не найдена.")
    faction.name_ru = name_ru
    session.add(faction)
    session.commit()
    session.refresh(faction)
    return faction


def delete_match(session: Session, match_id: int) -> None:
    match = session.get(Match, match_id)
    if match is None:
        raise NotFoundError("Партия не найдена.")
    session.delete(match)
    session.commit()


# ─── Журнал аудита ───────────────────────────────────────────────────────────

def list_audit_logs(
    session: Session,
    *,
    action: str | None = None,
    entity_type: str | None = None,
    limit: int = 100,
    offset: int = 0,
) -> dict[str, Any]:
    stmt = select(AuditLog).order_by(AuditLog.created_at.desc())
    if action:
        stmt = stmt.where(AuditLog.action == action)
    if entity_type:
        stmt = stmt.where(AuditLog.entity_type == entity_type)
    rows = session.exec(stmt.offset(offset).limit(limit)).all()
    return {
        "items": [
            {
                "id": r.id,
                "actor_id": r.actor_id,
                "action": r.action,
                "entity_type": r.entity_type,
                "entity_id": r.entity_id,
                "payload": r.payload,
                "ip": r.ip,
                "user_agent": r.user_agent,
                "created_at": iso_utc(r.created_at),
            }
            for r in rows
        ],
        "limit": limit,
        "offset": offset,
    }