"""Portfolio API routes."""

from fastapi import APIRouter, Depends, HTTPException, Request, Response, status

from app.core.auth import AuthContext, Permission, authorize_request
from app.core.config import Settings, get_settings
from app.repositories.factory import get_portfolio_repository_from_settings
from app.schemas.portfolio import (
    BuyRequest,
    CommentCreateRequest,
    CommentResponse,
    CommentUpdateRequest,
    CreatePortfolioRequest,
    InvestRequest,
    PortfolioDetailResponse,
    PortfolioListItem,
    ResetPortfolioRequest,
    SellRequest,
    TransferRequest,
    UpdatePortfolioRequest,
)
from app.services.portfolio_service import PortfolioService

router = APIRouter(prefix="/portfolios", tags=["portfolios"])


def _raise_portfolio_error(exc: ValueError) -> None:
    detail = str(exc)
    if "찾을 수 없습니다" in detail:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=detail) from exc
    raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=detail) from exc


def _get_service(settings: Settings) -> tuple[PortfolioService, object]:
    repository = get_portfolio_repository_from_settings(settings)
    return PortfolioService(repository), repository


def _close_repository(repository: object) -> None:
    if callable(getattr(type(repository), "close", None)):
        repository.close()


def _ownership_required(settings: Settings) -> bool:
    return settings.db_enabled


def _require_owner_context(auth_context: AuthContext) -> str:
    if auth_context.user_id is None:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Ownership context is required")
    return auth_context.user_id


def _ensure_portfolio_owned(repository: object, portfolio_id: str, auth_context: AuthContext) -> None:
    if auth_context.permission == Permission.ADMIN:
        return
    owner_user_id = _require_owner_context(auth_context)
    try:
        portfolio = repository.get(portfolio_id)
    except ValueError as exc:
        _raise_portfolio_error(exc)
    if portfolio.owner_user_id != owner_user_id:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Portfolio ownership mismatch")


@router.get("", response_model=list[PortfolioListItem])
def list_portfolios(
    request: Request,
    broker: str | None = None,
    status_filter: str | None = None,
    settings: Settings = Depends(get_settings),
) -> list[PortfolioListItem]:
    auth_context = authorize_request(Permission.READ, request, settings)
    service, repository = _get_service(settings)
    try:
        owner_user_id: str | None = None
        if _ownership_required(settings) and auth_context.permission != Permission.ADMIN:
            owner_user_id = _require_owner_context(auth_context)
        return service.list_portfolios(broker=broker, status=status_filter, owner_user_id=owner_user_id)
    finally:
        _close_repository(repository)


@router.get("/{portfolio_id}", response_model=PortfolioDetailResponse)
def get_portfolio(
    portfolio_id: str,
    request: Request,
    *,
    recent_trades: int = 5,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.READ, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.get_portfolio_status(portfolio_id=portfolio_id, recent_trades=recent_trades)
    finally:
        _close_repository(repository)


@router.post(
    "",
    response_model=PortfolioDetailResponse,
    status_code=status.HTTP_201_CREATED,
)
def create_portfolio(
    payload: CreatePortfolioRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        owner_user_id = auth_context.user_id or "system"
        if _ownership_required(settings):
            owner_user_id = _require_owner_context(auth_context)
        return service.create_portfolio(payload, owner_user_id=owner_user_id)
    finally:
        _close_repository(repository)


@router.patch("/{portfolio_id}", response_model=PortfolioDetailResponse)
def update_portfolio(
    portfolio_id: str,
    payload: UpdatePortfolioRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.update_portfolio(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.post("/{portfolio_id}/buy", response_model=PortfolioDetailResponse)
def buy_portfolio_asset(
    portfolio_id: str,
    payload: BuyRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.buy(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.post("/{portfolio_id}/sell", response_model=PortfolioDetailResponse)
def sell_portfolio_asset(
    portfolio_id: str,
    payload: SellRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.sell(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.post("/{portfolio_id}/invest", response_model=PortfolioDetailResponse)
def invest_buffer(
    portfolio_id: str,
    payload: InvestRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.invest(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.post("/{portfolio_id}/transfer", response_model=PortfolioDetailResponse)
def transfer_buffer(
    portfolio_id: str,
    payload: TransferRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.transfer(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.post("/{portfolio_id}/reset", response_model=PortfolioDetailResponse)
def reset_portfolio(
    portfolio_id: str,
    payload: ResetPortfolioRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> PortfolioDetailResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.reset(portfolio_id, payload)
    finally:
        _close_repository(repository)


@router.delete("/{portfolio_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_portfolio(
    portfolio_id: str,
    request: Request,
    *,
    keep_ledger: bool = False,
    settings: Settings = Depends(get_settings),
) -> Response:
    authorize_request(Permission.ADMIN, request, settings)
    service, repository = _get_service(settings)
    try:
        service.delete(portfolio_id, keep_ledger=keep_ledger)
    finally:
        _close_repository(repository)
    return Response(status_code=status.HTTP_204_NO_CONTENT)


@router.post(
    "/{portfolio_id}/comments",
    response_model=CommentResponse,
    status_code=status.HTTP_201_CREATED,
)
def create_comment(
    portfolio_id: str,
    payload: CommentCreateRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> CommentResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.create_comment(portfolio_id, payload)
    except ValueError as exc:
        _raise_portfolio_error(exc)
    finally:
        _close_repository(repository)


@router.get("/{portfolio_id}/comments", response_model=list[CommentResponse])
def list_comments(
    portfolio_id: str,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> list[CommentResponse]:
    auth_context = authorize_request(Permission.READ, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.list_comments(portfolio_id)
    except ValueError as exc:
        _raise_portfolio_error(exc)
    finally:
        _close_repository(repository)


@router.patch("/{portfolio_id}/comments/{comment_id}", response_model=CommentResponse)
def update_comment(
    portfolio_id: str,
    comment_id: str,
    payload: CommentUpdateRequest,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> CommentResponse:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        return service.update_comment(portfolio_id, comment_id, payload)
    except ValueError as exc:
        _raise_portfolio_error(exc)
    finally:
        _close_repository(repository)


@router.delete("/{portfolio_id}/comments/{comment_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_comment(
    portfolio_id: str,
    comment_id: str,
    request: Request,
    *,
    settings: Settings = Depends(get_settings),
) -> Response:
    auth_context = authorize_request(Permission.TRADE_WRITE, request, settings)
    service, repository = _get_service(settings)
    try:
        if _ownership_required(settings):
            _ensure_portfolio_owned(repository, portfolio_id, auth_context)
        service.delete_comment(portfolio_id, comment_id)
    except ValueError as exc:
        _raise_portfolio_error(exc)
    finally:
        _close_repository(repository)
    return Response(status_code=status.HTTP_204_NO_CONTENT)