from datetime import datetime, date
from pydantic import BaseModel, field_validator


# ─── Device ───────────────────────────────────────────────────────────────────

class DeviceRegister(BaseModel):
    apns_token: str
    device_name: str | None = None


class DeviceResponse(BaseModel):
    id: int
    apns_token: str
    device_name: str | None
    registered_at: datetime

    model_config = {"from_attributes": True}


# ─── Stock Portfolio ───────────────────────────────────────────────────────────

class StockPositionCreate(BaseModel):
    ticker: str
    shares: int
    cost_basis: float | None = None

    @field_validator("ticker")
    @classmethod
    def uppercase_ticker(cls, v: str) -> str:
        return v.upper().strip()

    @field_validator("shares")
    @classmethod
    def positive_shares(cls, v: int) -> int:
        if v <= 0:
            raise ValueError("shares must be positive")
        return v


class StockPositionResponse(BaseModel):
    id: int
    ticker: str
    shares: int
    cost_basis: float | None
    created_at: datetime

    model_config = {"from_attributes": True}


# ─── Option Position ───────────────────────────────────────────────────────────

class OptionPositionCreate(BaseModel):
    ticker: str
    strategy: str  # covered_call | cash_secured_put
    strike: float
    expiration: date
    premium_received: float
    contracts: int = 1

    @field_validator("ticker")
    @classmethod
    def uppercase_ticker(cls, v: str) -> str:
        return v.upper().strip()

    @field_validator("strategy")
    @classmethod
    def valid_strategy(cls, v: str) -> str:
        if v not in ("covered_call", "cash_secured_put"):
            raise ValueError("strategy must be 'covered_call' or 'cash_secured_put'")
        return v

    @field_validator("contracts")
    @classmethod
    def positive_contracts(cls, v: int) -> int:
        if v <= 0:
            raise ValueError("contracts must be positive")
        return v


class OptionPositionClose(BaseModel):
    status: str  # closed | rolled
    close_reason: str | None = None


class OptionPositionResponse(BaseModel):
    id: int
    ticker: str
    strategy: str
    strike: float
    expiration: date
    premium_received: float
    contracts: int
    status: str
    close_reason: str | None
    opened_at: datetime
    closed_at: datetime | None
    last_signal_hash: str | None

    model_config = {"from_attributes": True}


# ─── Signals ──────────────────────────────────────────────────────────────────

class SignalSnapshot(BaseModel):
    ticker: str
    current_price: float
    iv_rank: float
    sma_50: float
    sma_200: float
    nearest_support: float | None
    nearest_resistance: float | None
    trend: str  # uptrend | downtrend | sideways
    earnings_date: date | None
    computed_at: datetime


# ─── Recommendations ──────────────────────────────────────────────────────────

class RecommendationResponse(BaseModel):
    id: int
    ticker: str
    strategy: str
    time_horizon: str
    current_price: float
    recommended_strike: float
    recommended_expiration: date
    estimated_premium: float
    delta: float
    theta: float
    iv_rank: float
    signal_strength: str
    earnings_warning: bool
    earnings_date: date | None
    rationale: str
    signal_hash: str
    created_at: datetime

    model_config = {"from_attributes": True}


class RecommendationWithSignals(BaseModel):
    recommendation: RecommendationResponse
    signals: SignalSnapshot


# ─── Alerts ───────────────────────────────────────────────────────────────────

class AlertResponse(BaseModel):
    id: int
    ticker: str
    option_position_id: int | None
    alert_type: str
    message: str
    sent_at: datetime
    acknowledged: bool

    model_config = {"from_attributes": True}


# ─── Health ───────────────────────────────────────────────────────────────────

class HealthResponse(BaseModel):
    status: str
    scheduler_running: bool
    last_run: datetime | None