from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from pydantic import BaseModel, ConfigDict, Field


class Candle(BaseModel):
    ts: int
    open: float
    high: float
    low: float
    close: float
    volume: float


class ParamSpec(BaseModel):
    name: str
    type: Literal["int", "float", "bool", "str"]
    default: Any
    description: str = ""
    min: float | None = None
    max: float | None = None


class StrategyOut(BaseModel):
    key: str
    name: str
    description: str
    params: list[ParamSpec]


class PositionOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    strategy_key: str
    symbol: str
    side: str
    qty: float
    entry_price: float
    status: str
    stop_loss: float | None = None
    take_profit: float | None = None
    exit_price: float | None = None
    realized_pnl: float | None = None
    unrealized_pnl: float | None = None
    opened_at: datetime
    closed_at: datetime | None = None


class OrderOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    position_id: int | None
    strategy_key: str
    symbol: str
    side: str
    qty: float
    price: float
    fee: float
    reason: str
    created_at: datetime


class EventOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    level: str
    message: str
    strategy_key: str | None
    created_at: datetime


class EquityPointOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    equity: float
    cash: float
    price: float
    created_at: datetime


class StatusOut(BaseModel):
    running: bool
    mode: str
    exchange: str
    symbol: str
    timeframe: str
    strategy_key: str | None
    strategy_name: str | None
    params: dict[str, Any] = Field(default_factory=dict)
    price: float | None
    cash: float
    equity: float
    starting_balance: float
    realized_pnl: float
    unrealized_pnl: float
    total_pnl: float
    open_positions: int
    last_tick: datetime | None
    error: str | None = None
    halted: bool = False
    halt_reason: str | None = None
    trades_today: int = 0
    day_pnl: float = 0.0
    drawdown_pct: float = 0.0


class KillRequest(BaseModel):
    reason: str = "manual kill switch"


class StrategyConfigIn(BaseModel):
    name: str = Field(default="", max_length=80)
    strategy_key: str
    symbol: str
    timeframe: str
    params: dict[str, Any] = Field(default_factory=dict)


class StrategyConfigOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    name: str
    strategy_key: str
    symbol: str
    timeframe: str
    params: dict[str, Any]
    created_at: datetime


class StartRequest(BaseModel):
    strategy_key: str
    symbol: str | None = None
    timeframe: str | None = None
    params: dict[str, Any] = Field(default_factory=dict)
    starting_balance: float | None = None


class ManualOrderRequest(BaseModel):
    side: Literal["buy", "sell"]
    qty: float | None = None
    quote_amount: float | None = None
    reason: str = "manual"


class ClosePositionRequest(BaseModel):
    reason: str = "manual"


class BacktestRequest(BaseModel):
    strategy_key: str
    params: dict[str, Any] = Field(default_factory=dict)
    symbol: str | None = None
    timeframe: str | None = None
    limit: int = Field(default=500, ge=20, le=1000)
    starting_balance: float | None = None


class BacktestTradeOut(BaseModel):
    side: str
    entry_ts: int
    exit_ts: int
    entry_price: float
    exit_price: float
    qty: float
    pnl: float
    return_pct: float
    reason: str


class BacktestPointOut(BaseModel):
    ts: int
    equity: float
    buy_hold: float
    price: float


class BacktestMetricsOut(BaseModel):
    initial_equity: float
    final_equity: float
    total_return_pct: float
    buy_hold_return_pct: float
    max_drawdown_pct: float
    num_trades: int
    win_rate_pct: float
    profit_factor: float | None
    avg_trade_pct: float
    best_trade_pct: float
    worst_trade_pct: float
    sharpe: float | None


class BacktestResult(BaseModel):
    strategy_key: str
    strategy_name: str
    symbol: str
    timeframe: str
    starting_balance: float
    metrics: BacktestMetricsOut
    equity_curve: list[BacktestPointOut]
    trades: list[BacktestTradeOut]
    error: str | None = None