from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from typing import List, Optional
from app.api.dependencies import get_db_session, get_current_user, create_access_token
from app.schemas.dtos import (
    UserAuthRequest,
    TokenResponse,
    AccountBalanceDTO,
    LedgerEntryDTO,
    MarketDTO,
    CreateOrderRequest,
    OrderDTO
)
from app.domains.ledger.service import LedgerService
from app.domains.trading.service import MarketService, TradingService

api_router = APIRouter(prefix="/v1")

# ================= Auth Routes =================
@api_router.post("/auth/login", response_model=TokenResponse)
async def login_with_wallet(req: UserAuthRequest, session: AsyncSession = Depends(get_db_session)):
    """Web3 SIWE 钱包快速认证"""
    token = create_access_token(req.address)
    return TokenResponse(access_token=token, address=req.address.lower())

# ================= Market Routes =================
@api_router.get("/markets", response_model=List[MarketDTO])
async def get_markets(
    category: Optional[str] = None,
    status: Optional[str] = None,
    session: AsyncSession = Depends(get_db_session)
):
    """获取预测市场列表"""
    market_service = MarketService(session)
    markets = await market_service.list_markets(category, status)
    return [
        MarketDTO(
            market_address=m.market_address,
            question_id=m.question_id,
            title=m.title,
            description=m.description,
            category=m.category,
            tier=m.tier,
            creator=m.creator,
            status=m.status.value if hasattr(m.status, 'value') else str(m.status),
            outcomes=m.outcomes,
            winning_outcome=m.winning_outcome,
            resolution_time=m.resolution_time,
            created_at=m.created_at
        ) for m in markets
    ]

# ================= Orders & Trading =================
@api_router.post("/orders", response_model=OrderDTO)
async def place_order(
    req: CreateOrderRequest,
    current_user: str = Depends(get_current_user),
    session: AsyncSession = Depends(get_db_session)
):
    """创建并执行交易委托"""
    trading_service = TradingService(session)
    order = await trading_service.place_order(
        user_address=current_user,
        market_address=req.market_address,
        outcome_index=req.outcome_index,
        side=req.side,
        amount=req.amount,
        price=req.price
    )
    return OrderDTO(
        order_id=order.order_id,
        market_address=order.market_address,
        user_address=order.user_address,
        side=order.side,
        outcome_index=order.outcome_index,
        amount=order.amount,
        status=order.status,
        fee=order.fee,
        created_at=order.created_at
    )

# ================= Ledger & Balances =================
@api_router.get("/wallet/balance", response_model=AccountBalanceDTO)
async def get_balance(
    current_user: str = Depends(get_current_user),
    session: AsyncSession = Depends(get_db_session)
):
    """查询用户资金与冻结余额"""
    ledger_service = LedgerService(session)
    bal = await ledger_service.get_or_create_balance(current_user)
    return AccountBalanceDTO(
        address=bal.address,
        collateral_symbol=bal.collateral_symbol,
        available_balance=bal.available_balance,
        frozen_balance=bal.frozen_balance
    )

@api_router.get("/wallet/ledger", response_model=List[LedgerEntryDTO])
async def get_ledger_history(
    current_user: str = Depends(get_current_user),
    limit: int = 50,
    session: AsyncSession = Depends(get_db_session)
):
    """查询不可变复式记账流水"""
    ledger_service = LedgerService(session)
    entries = await ledger_service.list_user_ledger(current_user, limit)
    return [
        LedgerEntryDTO(
            id=e.id,
            entry_type=e.entry_type.value if hasattr(e.entry_type, 'value') else str(e.entry_type),
            amount=e.amount,
            balance_after=e.balance_after,
            frozen_after=e.frozen_after,
            related_market=e.related_market,
            created_at=e.created_at
        ) for e in entries
    ]