import uuid
from datetime import datetime

from sqlalchemy import String, Integer, ForeignKey, DateTime, Text, Boolean, UniqueConstraint, CheckConstraint
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB

from core.database import Base

class User(Base):
  __tablename__ = "users"

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  username: Mapped[str] = mapped_column(String, unique=True, nullable=False)
  email: Mapped[str] = mapped_column(String, unique=True, nullable=False)
  password_hash: Mapped[str] = mapped_column(String, nullable=False)
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  boosters: Mapped[int] = mapped_column(Integer, default=5, nullable=False)
  boosters_countdown: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
  wins: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  losses: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  shards: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  last_refresh_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
  reset_token: Mapped[str | None] = mapped_column(String, nullable=True)
  reset_token_expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
  email_verified: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
  email_verification_token: Mapped[str | None] = mapped_column(String, nullable=True)
  email_verification_token_expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
  trade_wishlist: Mapped[str | None] = mapped_column(Text, nullable=True, default="")
  last_active_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

  cards: Mapped[list["Card"]] = relationship(back_populates="user", cascade="all, delete-orphan")
  decks: Mapped[list["Deck"]] = relationship(back_populates="user", cascade="all, delete-orphan")
  notifications: Mapped[list["Notification"]] = relationship(back_populates="user", cascade="all, delete-orphan")
  friendships_sent: Mapped[list["Friendship"]] = relationship(
    foreign_keys="Friendship.requester_id", back_populates="requester", cascade="all, delete-orphan"
  )
  friendships_received: Mapped[list["Friendship"]] = relationship(
    foreign_keys="Friendship.addressee_id", back_populates="addressee", cascade="all, delete-orphan"
  )
  proposals_sent: Mapped[list["TradeProposal"]] = relationship(
    foreign_keys="TradeProposal.proposer_id", back_populates="proposer", cascade="all, delete-orphan"
  )
  proposals_received: Mapped[list["TradeProposal"]] = relationship(
    foreign_keys="TradeProposal.recipient_id", back_populates="recipient", cascade="all, delete-orphan"
  )
  challenges_sent: Mapped[list["GameChallenge"]] = relationship(
    foreign_keys="GameChallenge.challenger_id", back_populates="challenger", cascade="all, delete-orphan"
  )
  challenges_received: Mapped[list["GameChallenge"]] = relationship(
    foreign_keys="GameChallenge.challenged_id", back_populates="challenged", cascade="all, delete-orphan"
  )


class Card(Base):
  __tablename__ = "cards"

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  user_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=True)
  name: Mapped[str] = mapped_column(String, nullable=False)
  image_link: Mapped[str] = mapped_column(String, nullable=True)
  card_rarity: Mapped[str] = mapped_column(String, nullable=False)
  card_type: Mapped[str] = mapped_column(String, nullable=False)
  text: Mapped[str] = mapped_column(Text, nullable=True)
  attack: Mapped[int] = mapped_column(Integer, nullable=False)
  defense: Mapped[int] = mapped_column(Integer, nullable=False)
  cost: Mapped[int] = mapped_column(Integer, nullable=False)
  generated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  received_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True, default=None)
  times_played: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  reported: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
  ai_used: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
  is_favorite: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
  willing_to_trade: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)

  user: Mapped["User | None"] = relationship(back_populates="cards")
  deck_cards: Mapped[list["DeckCard"]] = relationship(back_populates="card", cascade="all, delete-orphan")


class Deck(Base):
  __tablename__ = "decks"

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  name: Mapped[str] = mapped_column(String, nullable=False)
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  times_played: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  wins: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  losses: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
  deleted: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)

  user: Mapped["User"] = relationship(back_populates="decks")
  deck_cards: Mapped[list["DeckCard"]] = relationship(back_populates="deck", cascade="all, delete-orphan")


class Notification(Base):
  __tablename__ = "notifications"
  __table_args__ = (
    CheckConstraint("type IN ('friend_request', 'trade_offer', 'trade_response', 'game_challenge')", name="ck_notifications_type"),
  )

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  # type is one of: friend_request, trade_offer, trade_response, game_challenge
  type: Mapped[str] = mapped_column(String, nullable=False)
  payload: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
  read: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

  user: Mapped["User"] = relationship(back_populates="notifications")


class Friendship(Base):
  __tablename__ = "friendships"
  __table_args__ = (
    UniqueConstraint("requester_id", "addressee_id", name="uq_friendship_requester_addressee"),
    CheckConstraint("status IN ('pending', 'accepted', 'declined')", name="ck_friendships_status"),
  )

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  requester_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  addressee_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  # status: pending / accepted / declined
  status: Mapped[str] = mapped_column(String, nullable=False, default="pending")
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)

  requester: Mapped["User"] = relationship(foreign_keys=[requester_id], back_populates="friendships_sent")
  addressee: Mapped["User"] = relationship(foreign_keys=[addressee_id], back_populates="friendships_received")


class TradeProposal(Base):
  __tablename__ = "trade_proposals"
  __table_args__ = (
    CheckConstraint("status IN ('pending', 'accepted', 'declined', 'expired')", name="ck_trade_proposals_status"),
  )

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  proposer_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  recipient_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  # Both sides stored as JSONB lists of UUID strings so either party can offer 0 or more cards,
  # mirroring the flexibility of the real-time trade system
  offered_card_ids: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
  requested_card_ids: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
  # status: pending / accepted / declined / expired
  status: Mapped[str] = mapped_column(String, nullable=False, default="pending")
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  expires_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)

  proposer: Mapped["User"] = relationship(foreign_keys=[proposer_id])
  recipient: Mapped["User"] = relationship(foreign_keys=[recipient_id])


class GameChallenge(Base):
  __tablename__ = "game_challenges"
  __table_args__ = (
    CheckConstraint("status IN ('pending', 'accepted', 'declined', 'expired')", name="ck_game_challenges_status"),
  )

  id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
  challenger_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  challenged_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
  challenger_deck_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("decks.id", ondelete="CASCADE"), nullable=False)
  # status: pending / accepted / declined / expired
  status: Mapped[str] = mapped_column(String, nullable=False, default="pending")
  created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now)
  expires_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)

  challenger: Mapped["User"] = relationship(foreign_keys=[challenger_id], back_populates="challenges_sent")
  challenged: Mapped["User"] = relationship(foreign_keys=[challenged_id], back_populates="challenges_received")
  challenger_deck: Mapped["Deck"] = relationship(foreign_keys=[challenger_deck_id])


class DeckCard(Base):
  __tablename__ = "deck_cards"

  deck_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("decks.id", ondelete="CASCADE"), primary_key=True)
  card_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("cards.id", ondelete="CASCADE"), primary_key=True)

  deck: Mapped["Deck"] = relationship(back_populates="deck_cards")
  card: Mapped["Card"] = relationship(back_populates="deck_cards")


class ProcessedWebhookEvent(Base):
  __tablename__ = "processed_webhook_events"

  # stripe_event_id is the primary key — acts as unique constraint to prevent duplicate processing
  stripe_event_id: Mapped[str] = mapped_column(String, primary_key=True)
  processed_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.now, nullable=False)