"""场内基金模拟交易 API Schemas（§T 用户自助端点）。

按 `docs/05` §T 端点清单设计：账户看板、委托、持仓、成交、资金明细。
请求/响应模型只承载字段契约，**业务校验**（产品可用性、适当性、持仓比例、
成交价快照）由 Service 层在调用行情/账户后处理。
"""

from __future__ import annotations

from datetime import datetime
from decimal import Decimal
from typing import Literal

from pydantic import BaseModel, ConfigDict, Field

OrderSide = Literal["buy", "sell"]
PriceType = Literal["market"]  # 首版只支持市价（基线 §6.2 明确）


class AccountSummary(BaseModel):
    """虚拟资金账户快照。"""

    model_config = ConfigDict(extra="forbid")

    account_no: str
    status: str
    currency: str
    initial_balance: Decimal
    cash_balance: Decimal
    available_cash: Decimal
    frozen_cash: Decimal


class PortfolioSummary(BaseModel):
    """组合汇总指标。"""

    model_config = ConfigDict(extra="forbid")

    total_asset: Decimal
    total_market_value: Decimal
    total_cost: Decimal
    total_profit_loss: Decimal
    total_profit_loss_ratio: Decimal
    today_profit_loss: Decimal
    today_profit_loss_ratio: Decimal


class HoldingItem(BaseModel):
    """单只基金持仓（前端可直接渲染）。"""

    model_config = ConfigDict(extra="forbid")

    product_id: int
    product_code: str
    product_name: str
    total_quantity: Decimal
    available_quantity: Decimal
    frozen_quantity: Decimal
    average_cost: Decimal
    cost_amount: Decimal
    latest_price: Decimal
    market_value: Decimal
    profit_loss: Decimal
    profit_loss_ratio: Decimal
    today_profit_loss: Decimal


class AccountDashboardResponse(BaseModel):
    """T001 `GET /api/v1/users/me/account/dashboard` 响应。"""

    model_config = ConfigDict(extra="forbid")

    account: AccountSummary
    summary: PortfolioSummary
    holdings: list[HoldingItem]
    as_of: datetime


class OrderCreateRequest(BaseModel):
    """T002 提交委托请求。"""

    model_config = ConfigDict(extra="forbid")

    product_code: str = Field(min_length=1, max_length=32)
    order_side: OrderSide
    quantity: Decimal = Field(gt=Decimal("0"))
    price_type: PriceType = "market"


class OrderCreateResponse(BaseModel):
    """T002 提交委托响应（市价立即成交，首版 status='已成交'）。"""

    model_config = ConfigDict(extra="forbid")

    order_no: str
    status: str
    executed_quantity: Decimal
    executed_price: Decimal
    gross_amount: Decimal
    fee_amount: Decimal
    net_amount: Decimal
    executed_at: datetime


class OrderSummary(BaseModel):
    """委托列表项（T003 / T004）。"""

    model_config = ConfigDict(extra="forbid")

    order_no: str
    product_id: int
    product_code: str
    product_name: str
    order_side: OrderSide
    price_type: PriceType
    quantity: Decimal
    limit_price: Decimal | None
    quote_price: Decimal
    quote_at: datetime
    filled_quantity: Decimal
    average_executed_price: Decimal | None
    status: str
    submitted_at: datetime
    cancelled_at: datetime | None
    reject_reason: str | None


class OrderCancelResponse(BaseModel):
    """T005 撤单响应。"""

    model_config = ConfigDict(extra="forbid")

    order_no: str
    status: str
    cancelled_at: datetime


class HoldingListResponse(BaseModel):
    """T006 持仓列表响应。"""

    model_config = ConfigDict(extra="forbid")

    holdings: list[HoldingItem]


class TransactionItem(BaseModel):
    """成交记录列表项（T007 / T008）。"""

    model_config = ConfigDict(extra="forbid")

    transaction_no: str
    order_no: str
    product_id: int
    product_code: str
    product_name: str
    order_side: OrderSide
    executed_price: Decimal
    executed_quantity: Decimal
    gross_amount: Decimal
    fee_amount: Decimal
    net_amount: Decimal
    quote_at: datetime
    executed_at: datetime


class TransactionListResponse(BaseModel):
    """T007 成交列表响应。"""

    model_config = ConfigDict(extra="forbid")

    transactions: list[TransactionItem]
    next_cursor: str | None = None


class CashLedgerItem(BaseModel):
    """资金明细项（T009）。"""

    model_config = ConfigDict(extra="forbid")

    ledger_no: str
    entry_type: str
    amount: Decimal
    balance_after: Decimal
    available_cash_after: Decimal
    frozen_cash_after: Decimal
    transaction_no: str | None
    occurred_at: datetime


class CashLedgerResponse(BaseModel):
    """T009 资金明细响应。"""

    model_config = ConfigDict(extra="forbid")

    entries: list[CashLedgerItem]
    next_cursor: str | None = None