from datetime import datetime, timezone
from typing import List, Optional

from sqlalchemy import (
    BigInteger,
    Boolean,
    DateTime,
    Float,
    ForeignKey,
    Integer,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


def utcnow() -> datetime:
    """Naive UTC datetime. All datetimes in this codebase are stored as naive-UTC."""
    return datetime.now(timezone.utc).replace(tzinfo=None)


def iso_utc(dt: Optional[datetime]) -> Optional[str]:
    """Serialize a naive-UTC datetime to an explicit ISO-8601 UTC string (suffix 'Z').
    If dt already carries tzinfo, convert to UTC first. Returns None if dt is None."""
    if dt is None:
        return None
    if dt.tzinfo is not None:
        dt = dt.astimezone(timezone.utc).replace(tzinfo=None)
    # Drop microseconds past millisecond for compactness; always end in Z
    return dt.isoformat(timespec="milliseconds") + "Z"


class Post(Base):
    __tablename__ = "posts"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    external_id: Mapped[str] = mapped_column(String(64), unique=True, index=True, nullable=False)
    text: Mapped[str] = mapped_column(Text, nullable=False)
    source: Mapped[str] = mapped_column(String(32), nullable=False, default="truth")
    published_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)
    sentiment: Mapped[str] = mapped_column(String(16), nullable=False, default="neutral")
    ai_confidence: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    relevant: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    price_impact_asset: Mapped[Optional[str]] = mapped_column(String(8), nullable=True)
    price_impact_m5: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    price_impact_m15: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    price_impact_m1h: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    price_at_post: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    signal: Mapped[Optional[str]] = mapped_column(String(8), nullable=True)
    ai_reasoning: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    prefilter_reason: Mapped[Optional[str]] = mapped_column(String(32), nullable=True)
    analysis_version: Mapped[Optional[str]] = mapped_column(String(16), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=utcnow)

    trades: Mapped[List["BotTrade"]] = relationship("BotTrade", back_populates="trigger_post")


class Candle(Base):
    __tablename__ = "candles"
    __table_args__ = (UniqueConstraint("asset", "timeframe", "time", name="uq_candle_asset_tf_time"),)

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    asset: Mapped[str] = mapped_column(String(8), nullable=False, index=True)
    timeframe: Mapped[str] = mapped_column(String(4), nullable=False)
    time: Mapped[int] = mapped_column(BigInteger, nullable=False, index=True)
    open: Mapped[float] = mapped_column(Float, nullable=False)
    high: Mapped[float] = mapped_column(Float, nullable=False)
    low: Mapped[float] = mapped_column(Float, nullable=False)
    close: Mapped[float] = mapped_column(Float, nullable=False)
    volume: Mapped[float] = mapped_column(Float, nullable=False)


class BotTrade(Base):
    __tablename__ = "bot_trades"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    asset: Mapped[str] = mapped_column(String(8), nullable=False)
    side: Mapped[str] = mapped_column(String(8), nullable=False)
    entry_price: Mapped[float] = mapped_column(Float, nullable=False)
    exit_price: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    pnl_usd: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
    hold_seconds: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    trigger_post_id: Mapped[Optional[int]] = mapped_column(
        Integer, ForeignKey("posts.id"), nullable=True, index=True
    )
    wallet_address: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    opened_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=utcnow)
    closed_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    hl_order_id: Mapped[Optional[str]] = mapped_column(String(128), nullable=True)

    trigger_post: Mapped[Optional["Post"]] = relationship("Post", back_populates="trades")


class Subscription(Base):
    __tablename__ = "subscriptions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    wallet_address: Mapped[str] = mapped_column(String(64), unique=True, index=True, nullable=False)
    hl_api_key: Mapped[Optional[str]] = mapped_column(String(256), nullable=True)
    active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    subscribed_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=utcnow)

    # Per-user trading config (null → use platform defaults)
    leverage: Mapped[int] = mapped_column(Integer, nullable=False, default=3)
    position_size_usd: Mapped[float] = mapped_column(Float, nullable=False, default=20.0)
    take_profit_pct: Mapped[Optional[float]] = mapped_column(Float, nullable=True)   # e.g. 2.0 = close at +2%
    stop_loss_pct: Mapped[Optional[float]] = mapped_column(Float, nullable=True)     # e.g. 1.5 = close at -1.5%
    min_confidence: Mapped[int] = mapped_column(Integer, nullable=False, default=80)