"""Wallet APIs — accounts + immutable ledger (Phase 7.6)."""
from __future__ import annotations

from uuid import UUID

from fastapi import APIRouter, Depends, Query, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import get_db, get_pagination, require_tenant
from app.api.permissions import require_permissions
from app.models.types import WalletLedgerEntryType
from app.permissions.definitions import (
    LOYALTY_WALLETS_ADJUST,
    LOYALTY_WALLETS_CREATE,
    LOYALTY_WALLETS_CREDIT,
    LOYALTY_WALLETS_DEBIT,
    LOYALTY_WALLETS_DELETE,
    LOYALTY_WALLETS_MANAGE,
    LOYALTY_WALLETS_TRANSFER,
    LOYALTY_WALLETS_VIEW,
)
from app.schemas.wallet import (
    WalletAccountCreate,
    WalletAccountRead,
    WalletAccountUpdate,
    WalletAdjustRequest,
    WalletBalanceRead,
    WalletCreditRequest,
    WalletDebitRequest,
    WalletLedgerPage,
    WalletLedgerEntryRead,
    WalletTransferRequest,
    WalletTransferResult,
)
from app.services.wallet_engine import WalletEngineService
from shared.pagination import PaginationParams
from shared.security import CurrentUser

router = APIRouter()


@router.post("", response_model=WalletAccountRead, status_code=status.HTTP_201_CREATED)
async def open_wallet(
    body: WalletAccountCreate,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_CREATE)),
):
    return await WalletEngineService(db).create(tenant_id, body, actor=user)


@router.get("", response_model=list[WalletAccountRead])
async def list_wallets(
    tenant_id: UUID = Depends(require_tenant),
    pagination: PaginationParams = Depends(get_pagination),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_VIEW)),
):
    return await WalletEngineService(db).list(
        tenant_id, offset=pagination.offset, limit=pagination.page_size
    )


@router.get("/{wallet_id}", response_model=WalletAccountRead)
async def get_wallet(
    wallet_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_VIEW)),
):
    return await WalletEngineService(db).get(tenant_id, wallet_id)


@router.get("/{wallet_id}/balance", response_model=WalletBalanceRead)
async def get_wallet_balance(
    wallet_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_VIEW)),
):
    return await WalletEngineService(db).get_balance(tenant_id, wallet_id)


@router.get("/{wallet_id}/ledger", response_model=WalletLedgerPage)
async def list_wallet_ledger(
    wallet_id: UUID,
    offset: int = Query(default=0, ge=0),
    limit: int = Query(default=50, ge=1, le=200),
    entry_type: WalletLedgerEntryType | None = None,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_VIEW)),
):
    rows, total = await WalletEngineService(db).list_ledger(
        tenant_id, wallet_id, entry_type=entry_type, offset=offset, limit=limit
    )
    return WalletLedgerPage(items=rows, total=total, offset=offset, limit=limit)


@router.patch("/{wallet_id}", response_model=WalletAccountRead)
async def update_wallet(
    wallet_id: UUID,
    body: WalletAccountUpdate,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_MANAGE)),
):
    return await WalletEngineService(db).update(tenant_id, wallet_id, body, actor=user)


@router.post("/{wallet_id}/credit", response_model=WalletLedgerEntryRead)
async def credit_wallet(
    wallet_id: UUID,
    body: WalletCreditRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_CREDIT)),
):
    return await WalletEngineService(db).credit(tenant_id, wallet_id, body, actor=user)


@router.post("/{wallet_id}/debit", response_model=WalletLedgerEntryRead)
async def debit_wallet(
    wallet_id: UUID,
    body: WalletDebitRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_DEBIT)),
):
    return await WalletEngineService(db).debit(tenant_id, wallet_id, body, actor=user)


@router.post("/{wallet_id}/adjust", response_model=WalletLedgerEntryRead)
async def adjust_wallet(
    wallet_id: UUID,
    body: WalletAdjustRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_ADJUST)),
):
    return await WalletEngineService(db).adjust(tenant_id, wallet_id, body, actor=user)


@router.post("/{wallet_id}/transfer", response_model=WalletTransferResult)
async def transfer_wallet(
    wallet_id: UUID,
    body: WalletTransferRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_TRANSFER)),
):
    source_entry, target_entry = await WalletEngineService(db).transfer(
        tenant_id, wallet_id, body, actor=user
    )
    return WalletTransferResult(source_entry=source_entry, target_entry=target_entry)


@router.post("/{wallet_id}/delete", response_model=WalletAccountRead)
async def close_wallet(
    wallet_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_WALLETS_DELETE)),
):
    return await WalletEngineService(db).soft_delete(tenant_id, wallet_id, actor=user)