import uuid
from typing import Any
from datetime import datetime, timedelta, timezone
from decimal import Decimal, ROUND_DOWN
import csv
import io

from fastapi import APIRouter, Depends, HTTPException, Query, Request, Response, status
from fastapi.responses import StreamingResponse
import requests
from requests import RequestException
from sqlalchemy import func, or_
from sqlalchemy.sql import cast
from sqlalchemy.types import String as SqlString
from sqlalchemy.orm import Session

from .config import (
    DONATION_ACTIVE_INVOICE_LIMIT,
    DONATION_EXPIRY_MINUTES,
    DONATIONS_ENABLED,
    FOUNDER_PAYMENT_ADDRESS,
    FOUNDER_VIEW_KEY,
    INVOICE_DEFAULT_EXPIRY_HOURS,
    QR_STORAGE_DIR,
)
from .db import get_db
from .formatting import format_xmr_amount
from .models import Invoice, ProfileHistory, User, Webhook, WebhookDelivery
from monero.address import Address, IntegratedAddress, SubAddress
from .rates import get_xmr_rate
from .subaddress_allocator import MAX_SUBADDRESS_INDEX, create_subaddress_for_user
from .schemas import (
    ApiCredentialsResetRequest,
    ApiCredentialsResetResponse,
    DonationCreate,
    InvoiceCreateUser,
    InvoiceListResponse,
    InvoiceResponse,
    InvoiceStatusResponse,
    LoginRequest,
    LoginResponse,
    ProfileResponse,
    ProfileUpdate,
    WebhookCreate,
    WebhookDeliveryResponse,
    WebhookResponse,
)
from .security import (
    decrypt_secret,
    decrypt_api_key,
    encrypt_secret,
    encrypt_api_key,
    generate_api_key,
    generate_webhook_secret,
    hash_api_key,
    require_api_key,
)
from .webhooks import build_webhook_payload, dispatch_webhooks
from .qr_codes import ensure_invoice_qr_png, invoice_qr_url, resolve_qr_settings

router = APIRouter()

WEBHOOK_EVENTS = (
    "invoice.created",
    "invoice.payment_detected",
    "invoice.confirmed",
    "invoice.expired",
)


def _require_donations_enabled() -> None:
    if not DONATIONS_ENABLED:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Donations are disabled",
)

MAX_QR_LOGO_DATA_URL_LENGTH = 120_000


def _get_user_for_api_key(db: Session, api_key: str) -> User | None:
    return db.query(User).filter(User.api_key_hash == hash_api_key(api_key)).first()


def _get_founder_user(db: Session) -> User:
    if not FOUNDER_PAYMENT_ADDRESS or not FOUNDER_VIEW_KEY:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Donations are not configured",
        )
    _validate_payment_address_and_view_key(FOUNDER_PAYMENT_ADDRESS, FOUNDER_VIEW_KEY)
    user = (
        db.query(User)
        .filter(User.payment_address == FOUNDER_PAYMENT_ADDRESS)
        .first()
    )
    if user is None:
        api_key = generate_api_key()
        webhook_secret = generate_webhook_secret()
        user = User(
            payment_address=FOUNDER_PAYMENT_ADDRESS,
            view_key_encrypted=encrypt_secret(FOUNDER_VIEW_KEY),
            api_key_hash=hash_api_key(api_key),
            api_key_encrypted=encrypt_api_key(api_key),
            webhook_secret_encrypted=encrypt_secret(webhook_secret),
        )
        db.add(user)
        db.commit()
        db.refresh(user)
        return user
    if decrypt_secret(user.view_key_encrypted) != FOUNDER_VIEW_KEY:
        user.view_key_encrypted = encrypt_secret(FOUNDER_VIEW_KEY)
        db.add(user)
        db.commit()
        db.refresh(user)
    _ensure_webhook_secret(db, user)
    return user


def _default_invoice_expiry() -> datetime:
    return datetime.now(timezone.utc) + timedelta(hours=INVOICE_DEFAULT_EXPIRY_HOURS)


def _donation_invoice_expiry() -> datetime:
    return datetime.now(timezone.utc) + timedelta(minutes=DONATION_EXPIRY_MINUTES)


def _is_donation_invoice(invoice: Invoice) -> bool:
    metadata = invoice.metadata_json or {}
    return isinstance(metadata, dict) and metadata.get("origin") == "donation"


def _ensure_webhook_secret(db: Session, user: User) -> str:
    if user.webhook_secret_encrypted:
        return decrypt_secret(user.webhook_secret_encrypted)
    secret = generate_webhook_secret()
    user.webhook_secret_encrypted = encrypt_secret(secret)
    db.add(user)
    db.commit()
    db.refresh(user)
    return secret


def _resolve_webhook_payload(
    payload: WebhookCreate,
) -> tuple[str | None, list[str], dict[str, str] | None]:
    event_urls = {key: str(value) for key, value in (payload.event_urls or {}).items()}
    events = list(payload.events or [])
    if event_urls:
        for key in event_urls:
            if key not in WEBHOOK_EVENTS:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="Webhook event is not supported",
                )
    if events:
        for event in events:
            if event not in WEBHOOK_EVENTS:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="Webhook event is not supported",
                )
    events_set = set(events) | set(event_urls.keys())
    if not events_set:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Select at least one webhook event",
        )
    if payload.url is None and not event_urls:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Webhook URL is required",
        )
    if payload.url is None:
        missing = [event for event in events_set if event not in event_urls]
        if missing:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Webhook URL is required for all selected events",
            )
    ordered_events = [event for event in WEBHOOK_EVENTS if event in events_set]
    return (str(payload.url) if payload.url else None, ordered_events, event_urls or None)


def _invoice_url(invoice: Invoice, request: Request) -> str:
    proto = request.headers.get("x-forwarded-proto", request.url.scheme)
    host = request.headers.get("x-forwarded-host", request.headers.get("host", ""))
    if not host:
        return f"/invoice/{invoice.id}"
    return f"{proto}://{host}/invoice/{invoice.id}"


def _qr_url(invoice: Invoice, request: Request) -> str:
    proto = request.headers.get("x-forwarded-proto", request.url.scheme)
    host = request.headers.get("x-forwarded-host", request.headers.get("host", ""))
    path = invoice_qr_url(str(invoice.id))
    if not host:
        return path
    return f"{proto}://{host}{path}"


def _invoice_response(
    invoice: Invoice,
    request: Request,
    warnings: list[str] | None = None,
) -> InvoiceResponse:
    response = InvoiceResponse.model_validate(invoice)
    metadata = invoice.metadata_json or {}
    quote = metadata.get("quote") if isinstance(metadata, dict) else None
    qr = metadata.get("qr") if isinstance(metadata, dict) else None
    qr_logo = qr.get("logo") if isinstance(qr, dict) else None
    qr_logo_data_url = qr.get("logo_data_url") if isinstance(qr, dict) else None
    if not isinstance(qr_logo, str):
        qr_logo = None
    if qr_logo not in ("monero", "none", "custom"):
        qr_logo = None
        qr_logo_data_url = None
    if qr_logo != "custom":
        qr_logo_data_url = None
    if not isinstance(qr_logo_data_url, str):
        qr_logo_data_url = None
    return response.model_copy(
        update={
            "invoice_url": _invoice_url(invoice, request),
            "qr_url": _qr_url(invoice, request),
            "warnings": warnings,
            "quote": quote,
            "qr_logo": qr_logo,
            "qr_logo_data_url": qr_logo_data_url,
        }
    )


def _public_invoice_status_response(
    db: Session,
    invoice: Invoice,
    request: Request,
) -> InvoiceStatusResponse:
    response = InvoiceStatusResponse.model_validate(invoice)
    metadata = invoice.metadata_json or {}
    update: dict[str, Any] = {}
    btcpay_data = metadata.get("btcpay") if isinstance(metadata, dict) else None
    if isinstance(btcpay_data, dict):
        amount = btcpay_data.get("amount")
        currency = btcpay_data.get("currency")
        if isinstance(amount, str) and isinstance(currency, str):
            update["btcpay_amount"] = amount
            update["btcpay_currency"] = currency
            if invoice.user_id:
                user = db.query(User).filter(User.id == invoice.user_id).first()
                if user and user.btcpay_checkout_style:
                    update["btcpay_checkout_style"] = user.btcpay_checkout_style
    if isinstance(metadata, dict) and isinstance(metadata.get("quote"), dict):
        update["quote"] = metadata.get("quote")
    qr = metadata.get("qr") if isinstance(metadata, dict) else None
    if isinstance(qr, dict):
        logo = qr.get("logo")
        logo_data_url = qr.get("logo_data_url")
        if isinstance(logo, str) and logo in ("monero", "none", "custom"):
            update["qr_logo"] = logo
            if logo == "custom" and isinstance(logo_data_url, str):
                update["qr_logo_data_url"] = logo_data_url
    update["qr_url"] = _qr_url(invoice, request)
    return response.model_copy(update=update)


def _resolve_invoice_amount(
    db: Session,
    *,
    user: User,
    requested_amount_xmr: Decimal | None = None,
    requested_amount_fiat: Decimal | None = None,
    requested_currency: str | None = None,
) -> tuple[Decimal, list[str] | None, dict[str, str] | None]:
    if requested_amount_xmr is not None:
        return requested_amount_xmr, None, None
    if requested_amount_fiat is None:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="amount_xmr or amount_fiat is required",
        )
    if not requested_currency:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="currency is required when amount_fiat is provided",
        )
    try:
        quote = get_xmr_rate(requested_currency)
    except ValueError as exc:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(exc),
        ) from exc
    except Exception as exc:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Fiat quote service unavailable",
        ) from exc
    amount_xmr = (Decimal(requested_amount_fiat) / quote.rate).quantize(
        Decimal("0.000000000001"), rounding=ROUND_DOWN
    )
    warnings = ["Fiat conversion is an estimate and does not lock a rate."]
    quote_payload = {
        "fiat_amount": str(requested_amount_fiat),
        "fiat_currency": quote.currency,
        "rate": str(quote.rate),
        "source": quote.source,
        "quoted_at": quote.quoted_at.isoformat(),
    }
    return amount_xmr, warnings, quote_payload


def _validate_payment_address_and_view_key(payment_address: str, view_key: str) -> None:
    try:
        address = Address(payment_address)
    except ValueError as exc:
        try:
            SubAddress(payment_address)
        except ValueError:
            try:
                IntegratedAddress(payment_address)
            except ValueError:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="Primary address is invalid",
                ) from exc
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Integrated addresses are not supported. Use the primary address.",
            ) from exc
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Subaddresses are not supported. Use the primary address.",
        ) from exc
    if not address.check_private_view_key(view_key):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Secret view key does not match the primary address",
        )


@router.post(
    "/api/core/donations",
    response_model=InvoiceResponse,
    status_code=201,
    include_in_schema=False,
)
def create_donation_invoice(
    payload: DonationCreate,
    request: Request,
    db: Session = Depends(get_db),
):
    _require_donations_enabled()
    user = _get_founder_user(db)
    expires_at = _donation_invoice_expiry()
    active_limit = min(max(1, DONATION_ACTIVE_INVOICE_LIMIT), MAX_SUBADDRESS_INDEX)
    now = datetime.now(timezone.utc)
    active_count = (
        db.query(func.count(Invoice.id))
        .filter(
            Invoice.user_id == user.id,
            Invoice.status.in_(["pending", "payment_detected"]),
            or_(Invoice.expires_at.is_(None), Invoice.expires_at > now),
        )
        .scalar()
        or 0
    )
    if active_count >= active_limit:
        raise HTTPException(
            status_code=status.HTTP_429_TOO_MANY_REQUESTS,
            detail="Donation traffic is high. Try again soon.",
        )
    resolved_amount, warnings, _ = _resolve_invoice_amount(
        db,
        user=user,
        requested_amount_xmr=payload.amount_xmr,
    )
    address, subaddress_index = create_subaddress_for_user(db, user=user)
    invoice = Invoice(
        user_id=user.id,
        wallet_address=user.payment_address,
        address=address,
        subaddress_index=subaddress_index,
        amount_xmr=resolved_amount,
        status="pending",
        confirmation_target=payload.confirmation_target,
        metadata_json={"origin": "donation"},
        expires_at=expires_at,
    )
    db.add(invoice)
    db.commit()
    db.refresh(invoice)
    try:
        ensure_invoice_qr_png(
            invoice=invoice,
            storage_dir=QR_STORAGE_DIR,
            settings=resolve_qr_settings(invoice),
        )
    except HTTPException:
        pass
    return _invoice_response(invoice, request, warnings=warnings)


@router.get(
    "/api/core/public/invoice/{invoice_id}",
    response_model=InvoiceStatusResponse,
)
def get_invoice_status(
    invoice_id: uuid.UUID,
    request: Request,
    db: Session = Depends(get_db),
):
    invoice = db.query(Invoice).filter(Invoice.id == invoice_id).first()
    if invoice is None or _is_donation_invoice(invoice):
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Invoice not found",
        )
    try:
        ensure_invoice_qr_png(
            invoice=invoice,
            storage_dir=QR_STORAGE_DIR,
            settings=resolve_qr_settings(invoice),
        )
    except HTTPException:
        pass
    return _public_invoice_status_response(db, invoice, request)


@router.get(
    "/api/core/public/donation/{invoice_id}",
    response_model=InvoiceStatusResponse,
    include_in_schema=False,
)
def get_donation_status(
    invoice_id: uuid.UUID,
    request: Request,
    db: Session = Depends(get_db),
):
    _require_donations_enabled()
    founder = _get_founder_user(db)
    invoice = db.query(Invoice).filter(Invoice.id == invoice_id).first()
    if (
        invoice is None
        or not _is_donation_invoice(invoice)
        or invoice.user_id != founder.id
    ):
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Donation invoice not found",
        )
    try:
        ensure_invoice_qr_png(
            invoice=invoice,
            storage_dir=QR_STORAGE_DIR,
            settings=resolve_qr_settings(invoice),
        )
    except HTTPException:
        pass
    return _public_invoice_status_response(db, invoice, request)


@router.post("/api/core/webhooks", response_model=WebhookResponse)
def register_webhook(
    payload: WebhookCreate,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    _ensure_webhook_secret(db, user)
    url, events, event_urls = _resolve_webhook_payload(payload)
    webhook = Webhook(
        user_id=user.id,
        url=url,
        events=events,
        event_urls=event_urls,
        active=True,
    )
    db.add(webhook)
    db.commit()
    db.refresh(webhook)
    return webhook


@router.get("/api/core/webhooks", response_model=list[WebhookResponse])
def list_webhooks(
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    return (
        db.query(Webhook)
        .filter(Webhook.user_id == user.id)
        .order_by(Webhook.created_at.desc())
        .all()
    )


@router.get("/api/core/webhooks/history", response_model=list[WebhookDeliveryResponse])
def list_webhook_history(
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    return (
        db.query(WebhookDelivery)
        .filter(WebhookDelivery.user_id == user.id)
        .order_by(WebhookDelivery.created_at.desc())
        .limit(limit)
        .offset(offset)
        .all()
    )


@router.post(
    "/api/core/webhooks/deliveries/{delivery_id}/redeliver",
    status_code=200,
)
def redeliver_webhook_delivery(
    delivery_id: uuid.UUID,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    delivery = (
        db.query(WebhookDelivery)
        .filter(WebhookDelivery.id == delivery_id, WebhookDelivery.user_id == user.id)
        .first()
    )
    if delivery is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Webhook delivery not found",
        )
    if delivery.http_status is not None and delivery.http_status < 400:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Only failed deliveries can be redelivered",
        )
    payload = delivery.payload_json
    if not isinstance(payload, dict):
        payload = None
    if payload is None and delivery.invoice_id:
        invoice = db.query(Invoice).filter(Invoice.id == delivery.invoice_id).first()
        if invoice is not None:
            payload = build_webhook_payload(delivery.event, invoice)
    if payload is None:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Webhook payload is unavailable for this delivery",
        )

    webhook_secret = _ensure_webhook_secret(db, user)
    status_code = None
    error_message = None
    try:
        response = requests.post(
            delivery.url,
            json=payload,
            headers={"X-Webhook-Secret": webhook_secret},
            timeout=5,
        )
        status_code = response.status_code
    except RequestException as exc:
        error_message = str(exc)

    redelivery = WebhookDelivery(
        user_id=user.id,
        webhook_id=delivery.webhook_id,
        event=delivery.event,
        url=delivery.url,
        invoice_id=delivery.invoice_id,
        invoice_address=delivery.invoice_address,
        invoice_subaddress_index=delivery.invoice_subaddress_index,
        invoice_amount_xmr=delivery.invoice_amount_xmr,
        invoice_status=delivery.invoice_status,
        payload_json=payload,
        http_status=status_code,
        error_message=error_message,
    )
    db.add(redelivery)
    db.commit()
    db.refresh(redelivery)
    return {
        "delivery_id": str(redelivery.id),
        "http_status": redelivery.http_status,
        "error_message": redelivery.error_message,
    }


@router.delete(
    "/api/core/webhooks/{webhook_id}",
    status_code=204,
    responses={204: {"description": "Webhook deleted"}},
)
def delete_webhook(
    webhook_id: uuid.UUID,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    webhook = (
        db.query(Webhook)
        .filter(Webhook.id == webhook_id, Webhook.user_id == user.id)
        .first()
    )
    if webhook is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Webhook not found",
        )
    db.delete(webhook)
    db.commit()
    return None


@router.post("/api/core/auth/login", response_model=LoginResponse)
def login_user(payload: LoginRequest, db: Session = Depends(get_db)):
    payment_address = payload.payment_address.strip()
    view_key = payload.view_key.strip()
    _validate_payment_address_and_view_key(payment_address, view_key)
    user = db.query(User).filter(User.payment_address == payment_address).first()
    if user is None:
        api_key = generate_api_key()
        webhook_secret = generate_webhook_secret()
        user = User(
            payment_address=payment_address,
            view_key_encrypted=encrypt_secret(view_key),
            api_key_hash=hash_api_key(api_key),
            api_key_encrypted=encrypt_api_key(api_key),
            webhook_secret_encrypted=encrypt_secret(webhook_secret),
        )
        db.add(user)
        db.commit()
        db.refresh(user)
        return {
            "api_key": api_key,
            "webhook_secret": webhook_secret,
            "store_id": user.id,
        }
    current_view_key = decrypt_secret(user.view_key_encrypted)
    if current_view_key != view_key:
        history_entry = ProfileHistory(
            user_id=user.id,
            field_name="view_key",
            old_value=user.view_key_encrypted,
            new_value=encrypt_secret(view_key),
            value_encrypted=True,
        )
        user.view_key_encrypted = encrypt_secret(view_key)
        db.add(history_entry)
        db.commit()
        db.refresh(user)
    webhook_secret = _ensure_webhook_secret(db, user)
    return {
        "api_key": decrypt_api_key(user.api_key_encrypted),
        "webhook_secret": webhook_secret,
        "store_id": user.id,
    }


@router.post("/api/core/auth/validate", status_code=status.HTTP_204_NO_CONTENT)
def validate_login(payload: LoginRequest) -> Response:
    payment_address = payload.payment_address.strip()
    view_key = payload.view_key.strip()
    _validate_payment_address_and_view_key(payment_address, view_key)
    return Response(status_code=status.HTTP_204_NO_CONTENT)


@router.post(
    "/api/core/api-credentials/reset",
    response_model=ApiCredentialsResetResponse,
)
def reset_api_credentials(
    payload: ApiCredentialsResetRequest,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    if not payload.reset_api_key and not payload.reset_webhook_secret:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Select at least one credential to reset",
        )
    response: dict[str, str] = {}
    if payload.reset_api_key:
        new_key = generate_api_key()
        new_key_encrypted = encrypt_api_key(new_key)
        history_entry = ProfileHistory(
            user_id=user.id,
            field_name="api_key",
            old_value=user.api_key_encrypted,
            new_value=new_key_encrypted,
            value_encrypted=True,
        )
        user.api_key_hash = hash_api_key(new_key)
        user.api_key_encrypted = new_key_encrypted
        db.add(history_entry)
        response["api_key"] = new_key
    if payload.reset_webhook_secret:
        new_secret = generate_webhook_secret()
        new_secret_encrypted = encrypt_secret(new_secret)
        history_entry = ProfileHistory(
            user_id=user.id,
            field_name="webhook_secret",
            old_value=user.webhook_secret_encrypted,
            new_value=new_secret_encrypted,
            value_encrypted=True,
        )
        user.webhook_secret_encrypted = new_secret_encrypted
        db.add(history_entry)
        response["webhook_secret"] = new_secret
    db.commit()
    db.refresh(user)
    return response


@router.get("/api/core/profile", response_model=ProfileResponse)
def get_profile(
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    return user


@router.patch("/api/core/profile", response_model=ProfileResponse)
def update_profile(
    payload: ProfileUpdate,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    if not payload.model_fields_set:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Select at least one profile field to update",
        )
    if (
        "btcpay_checkout_style" in payload.model_fields_set
        and payload.btcpay_checkout_style != user.btcpay_checkout_style
    ):
        history_entry = ProfileHistory(
            user_id=user.id,
            field_name="btcpay_checkout_style",
            old_value=user.btcpay_checkout_style,
            new_value=payload.btcpay_checkout_style,
            value_encrypted=False,
        )
        user.btcpay_checkout_style = payload.btcpay_checkout_style
        db.add(history_entry)
    if (
        "default_confirmation_target" in payload.model_fields_set
        and payload.default_confirmation_target is not None
        and payload.default_confirmation_target != user.default_confirmation_target
    ):
        history_entry = ProfileHistory(
            user_id=user.id,
            field_name="default_confirmation_target",
            old_value=str(user.default_confirmation_target),
            new_value=str(payload.default_confirmation_target),
            value_encrypted=False,
        )
        user.default_confirmation_target = payload.default_confirmation_target
        db.add(history_entry)
    if "default_qr_logo" in payload.model_fields_set:
        if payload.default_qr_logo is not None and payload.default_qr_logo != user.default_qr_logo:
            history_entry = ProfileHistory(
                user_id=user.id,
                field_name="default_qr_logo",
                old_value=user.default_qr_logo,
                new_value=payload.default_qr_logo,
                value_encrypted=False,
            )
            user.default_qr_logo = payload.default_qr_logo
            db.add(history_entry)
    if "default_qr_logo_data_url" in payload.model_fields_set:
        if payload.default_qr_logo_data_url is not None:
            value = payload.default_qr_logo_data_url.strip()
            if value and len(value) > MAX_QR_LOGO_DATA_URL_LENGTH:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="QR logo image is too large",
                )
            if value == "":
                payload.default_qr_logo_data_url = None
        if payload.default_qr_logo_data_url != user.default_qr_logo_data_url:
            history_entry = ProfileHistory(
                user_id=user.id,
                field_name="default_qr_logo_data_url",
                old_value=user.default_qr_logo_data_url,
                new_value=payload.default_qr_logo_data_url,
                value_encrypted=False,
            )
            user.default_qr_logo_data_url = payload.default_qr_logo_data_url
            db.add(history_entry)
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


@router.post("/api/core/invoices", response_model=InvoiceResponse, status_code=201)
def create_invoice_for_user(
    payload: InvoiceCreateUser,
    request: Request,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    if not user.payment_address or not user.view_key_encrypted:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Primary address is not configured for this user",
        )
    confirmation_target = payload.confirmation_target
    if "confirmation_target" not in payload.model_fields_set:
        confirmation_target = user.default_confirmation_target
    expires_at = payload.expires_at or _default_invoice_expiry()
    resolved_amount, warnings, quote = _resolve_invoice_amount(
        db,
        user=user,
        requested_amount_xmr=payload.amount_xmr,
        requested_amount_fiat=payload.amount_fiat,
        requested_currency=payload.currency,
    )
    if warnings is not None and len(warnings) == 0:
        warnings = None
    metadata = payload.metadata or {}
    if quote:
        metadata = {**metadata, "quote": quote}
    if isinstance(metadata, dict):
        qr = metadata.get("qr")
        if not isinstance(qr, dict):
            qr = None
        if qr is None:
            qr = {"logo": user.default_qr_logo}
            if user.default_qr_logo == "custom" and user.default_qr_logo_data_url:
                qr["logo_data_url"] = user.default_qr_logo_data_url
            metadata = {**metadata, "qr": qr}
        else:
            logo = qr.get("logo")
            logo_data_url = qr.get("logo_data_url")
            if isinstance(logo, str) and logo in ("monero", "none", "custom"):
                normalized = {"logo": logo}
                if logo == "custom":
                    if isinstance(logo_data_url, str):
                        trimmed = logo_data_url.strip()
                        if trimmed and len(trimmed) > MAX_QR_LOGO_DATA_URL_LENGTH:
                            raise HTTPException(
                                status_code=status.HTTP_400_BAD_REQUEST,
                                detail="QR logo image is too large",
                            )
                        if trimmed:
                            normalized["logo_data_url"] = trimmed
                metadata = {**metadata, "qr": normalized}
    else:
        metadata = {"qr": {"logo": user.default_qr_logo}}
        if user.default_qr_logo == "custom" and user.default_qr_logo_data_url:
            metadata["qr"]["logo_data_url"] = user.default_qr_logo_data_url
    address, subaddress_index = create_subaddress_for_user(db, user=user)
    invoice = Invoice(
        user_id=user.id,
        wallet_address=user.payment_address,
        address=address,
        subaddress_index=subaddress_index,
        amount_xmr=resolved_amount,
        status="pending",
        confirmation_target=confirmation_target,
        total_paid_atomic=0,
        metadata_json=metadata,
        expires_at=expires_at,
    )
    db.add(invoice)
    db.commit()
    db.refresh(invoice)
    try:
        ensure_invoice_qr_png(
            invoice=invoice,
            storage_dir=QR_STORAGE_DIR,
            settings=resolve_qr_settings(invoice),
        )
    except HTTPException:
        pass
    dispatch_webhooks(db, str(user.id), "invoice.created", invoice)
    return _invoice_response(invoice, request, warnings=warnings)


@router.get("/api/core/invoices", response_model=InvoiceListResponse)
def list_invoices_for_user(
    request: Request,
    limit: int = Query(default=50, ge=1, le=100),
    offset: int = Query(default=0, ge=0),
    status_filter: str | None = Query(default=None, alias="status"),
    include_archived: bool = Query(default=False, alias="include_archived"),
    q: str | None = Query(default=None),
    sort: str = Query(default="created_at"),
    order: str = Query(default="desc"),
    created_from: datetime | None = Query(default=None),
    created_to: datetime | None = Query(default=None),
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    query = db.query(Invoice).filter(Invoice.user_id == user.id)
    if not include_archived:
        query = query.filter(Invoice.archived_at.is_(None))
    if status_filter:
        query = query.filter(Invoice.status == status_filter)
    if q:
        needle = q.strip()
        if needle:
            try:
                invoice_uuid = uuid.UUID(needle)
            except ValueError:
                invoice_uuid = None
            matchers = []
            if invoice_uuid is not None:
                matchers.append(Invoice.id == invoice_uuid)
            matchers.append(Invoice.address.ilike(f"%{needle}%"))
            matchers.append(cast(Invoice.metadata_json, SqlString).ilike(f"%{needle}%"))
            query = query.filter(or_(*matchers))
    if created_from:
        query = query.filter(Invoice.created_at >= created_from)
    if created_to:
        query = query.filter(Invoice.created_at <= created_to)

    sort_keys = {
        "created_at": Invoice.created_at,
        "expires_at": Invoice.expires_at,
        "amount_xmr": Invoice.amount_xmr,
        "status": Invoice.status,
        "confirmations": Invoice.confirmations,
        "confirmation_target": Invoice.confirmation_target,
    }
    sort_column = sort_keys.get(sort, Invoice.created_at)
    if order.lower() == "asc":
        query = query.order_by(sort_column.asc())
    else:
        query = query.order_by(sort_column.desc())
    items = (
        query.offset(offset)
        .limit(limit)
        .all()
    )
    invoice_items = [_invoice_response(invoice, request) for invoice in items]
    total_query = db.query(func.count(Invoice.id)).filter(Invoice.user_id == user.id)
    if not include_archived:
        total_query = total_query.filter(Invoice.archived_at.is_(None))
    if status_filter:
        total_query = total_query.filter(Invoice.status == status_filter)
    if q:
        needle = q.strip()
        if needle:
            try:
                invoice_uuid = uuid.UUID(needle)
            except ValueError:
                invoice_uuid = None
            matchers = []
            if invoice_uuid is not None:
                matchers.append(Invoice.id == invoice_uuid)
            matchers.append(Invoice.address.ilike(f"%{needle}%"))
            matchers.append(cast(Invoice.metadata_json, SqlString).ilike(f"%{needle}%"))
            total_query = total_query.filter(or_(*matchers))
    if created_from:
        total_query = total_query.filter(Invoice.created_at >= created_from)
    if created_to:
        total_query = total_query.filter(Invoice.created_at <= created_to)
    total = total_query.scalar() or 0
    return {"items": invoice_items, "total": total}


@router.get(
    "/api/core/invoices/export.csv",
    responses={200: {"content": {"text/csv": {}}}},
)
def export_invoices_csv(
    include_archived: bool = Query(default=False, alias="include_archived"),
    status_filter: str | None = Query(default=None, alias="status"),
    q: str | None = Query(default=None),
    sort: str = Query(default="created_at"),
    order: str = Query(default="desc"),
    created_from: datetime | None = Query(default=None),
    created_to: datetime | None = Query(default=None),
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )

    query = db.query(Invoice).filter(Invoice.user_id == user.id)
    if not include_archived:
        query = query.filter(Invoice.archived_at.is_(None))
    if status_filter:
        query = query.filter(Invoice.status == status_filter)
    if q:
        needle = q.strip()
        if needle:
            try:
                invoice_uuid = uuid.UUID(needle)
            except ValueError:
                invoice_uuid = None
            matchers = []
            if invoice_uuid is not None:
                matchers.append(Invoice.id == invoice_uuid)
            matchers.append(Invoice.address.ilike(f"%{needle}%"))
            matchers.append(cast(Invoice.metadata_json, SqlString).ilike(f"%{needle}%"))
            query = query.filter(or_(*matchers))
    if created_from:
        query = query.filter(Invoice.created_at >= created_from)
    if created_to:
        query = query.filter(Invoice.created_at <= created_to)

    sort_keys = {
        "created_at": Invoice.created_at,
        "expires_at": Invoice.expires_at,
        "amount_xmr": Invoice.amount_xmr,
        "status": Invoice.status,
        "confirmations": Invoice.confirmations,
        "confirmation_target": Invoice.confirmation_target,
    }
    sort_column = sort_keys.get(sort, Invoice.created_at)
    if order.lower() == "asc":
        query = query.order_by(sort_column.asc())
    else:
        query = query.order_by(sort_column.desc())

    def _row_writer():
        buffer = io.StringIO()
        writer = csv.writer(buffer)
        writer.writerow(
            [
                "id",
                "status",
                "amount_xmr",
                "confirmation_target",
                "confirmations",
                "paid_after_expiry",
                "paid_after_expiry_at",
                "address",
                "subaddress_index",
                "created_at",
                "expires_at",
                "detected_at",
                "confirmed_at",
                "archived_at",
                "metadata",
            ]
        )
        yield buffer.getvalue()
        buffer.seek(0)
        buffer.truncate(0)

        for invoice in query.yield_per(500):
            metadata = invoice.metadata_json
            if metadata is None:
                metadata_value = ""
            else:
                metadata_value = str(metadata)
            writer.writerow(
                [
                    str(invoice.id),
                    invoice.status,
                    format_xmr_amount(invoice.amount_xmr),
                    invoice.confirmation_target,
                    invoice.confirmations or 0,
                    bool(invoice.paid_after_expiry),
                    invoice.paid_after_expiry_at.isoformat()
                    if invoice.paid_after_expiry_at
                    else "",
                    invoice.address,
                    invoice.subaddress_index if invoice.subaddress_index is not None else "",
                    invoice.created_at.isoformat() if invoice.created_at else "",
                    invoice.expires_at.isoformat() if invoice.expires_at else "",
                    invoice.detected_at.isoformat() if invoice.detected_at else "",
                    invoice.confirmed_at.isoformat() if invoice.confirmed_at else "",
                    invoice.archived_at.isoformat() if invoice.archived_at else "",
                    metadata_value,
                ]
            )
            yield buffer.getvalue()
            buffer.seek(0)
            buffer.truncate(0)

    filename = f"invoices-{datetime.now(timezone.utc).date().isoformat()}.csv"
    headers = {"Content-Disposition": f'attachment; filename="{filename}"'}
    return StreamingResponse(_row_writer(), media_type="text/csv", headers=headers)


@router.get("/api/core/invoices/{invoice_id}", response_model=InvoiceResponse)
def get_invoice_for_user(
    invoice_id: uuid.UUID,
    request: Request,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    invoice = (
        db.query(Invoice)
        .filter(
            Invoice.id == invoice_id,
            Invoice.user_id == user.id,
            Invoice.archived_at.is_(None),
        )
        .first()
    )
    if invoice is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Invoice not found",
        )
    return _invoice_response(invoice, request)


@router.delete(
    "/api/core/invoices/{invoice_id}",
    status_code=204,
    responses={204: {"description": "Invoice archived"}},
)
def archive_invoice_for_user(
    invoice_id: uuid.UUID,
    db: Session = Depends(get_db),
    api_key: str = Depends(require_api_key),
):
    user = _get_user_for_api_key(db, api_key)
    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User API key required",
        )
    invoice = (
        db.query(Invoice)
        .filter(
            Invoice.id == invoice_id,
            Invoice.user_id == user.id,
            Invoice.archived_at.is_(None),
        )
        .first()
    )
    if invoice is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Invoice not found",
        )
    if invoice.status not in ("pending", "expired", "invalid"):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Only pending, expired, or invalid invoices can be archived",
        )
    invoice.archived_at = datetime.now(timezone.utc)
    db.add(invoice)
    db.commit()
    return None