from sqlalchemy import (
    Boolean,
    Column,
    Integer,
    String,
    DateTime,
    Text,
    ForeignKey,
    Enum,
)
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from app.db.base import Base
import enum


class MessageType(enum.Enum):
    TEXT = "text"
    IMAGE = "image"
    FILE = "file"


class Conversation(Base):
    __tablename__ = "conversations"

    id = Column(Integer, primary_key=True, index=True)
    participant_1_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    participant_2_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, nullable=False, default=func.now())
    updated_at = Column(
        DateTime, nullable=False, default=func.now(), onupdate=func.now()
    )

    # Relationships
    participant_1 = relationship("User", foreign_keys=[participant_1_id])
    participant_2 = relationship("User", foreign_keys=[participant_2_id])
    messages = relationship(
        "Message", back_populates="conversation", cascade="all, delete-orphan"
    )


class Message(Base):
    __tablename__ = "messages"

    id = Column(Integer, primary_key=True, index=True)
    conversation_id = Column(Integer, ForeignKey("conversations.id"), nullable=False)
    sender_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    receiver_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    message_type = Column(Enum(MessageType), default=MessageType.TEXT)
    content = Column(Text, nullable=False)
    file_url = Column(String, nullable=True)
    is_read = Column(Boolean, default=False)
    read_at = Column(DateTime, nullable=True)
    created_at = Column(DateTime, nullable=False, default=func.now())

    # Relationships
    conversation = relationship("Conversation", back_populates="messages")
    sender = relationship("User", foreign_keys=[sender_id])
    receiver = relationship("User", foreign_keys=[receiver_id])


class GroupChat(Base):
    __tablename__ = "group_chats"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, nullable=False)
    description = Column(Text, nullable=True)
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, nullable=False, default=func.now())

    # Relationships
    creator = relationship("User")
    members = relationship(
        "GroupChatMember", back_populates="group_chat", cascade="all, delete-orphan"
    )
    messages = relationship(
        "GroupMessage", back_populates="group_chat", cascade="all, delete-orphan"
    )


class GroupChatMember(Base):
    __tablename__ = "group_chat_members"

    id = Column(Integer, primary_key=True, index=True)
    group_chat_id = Column(Integer, ForeignKey("group_chats.id"), nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    is_admin = Column(Boolean, default=False)
    joined_at = Column(DateTime, nullable=False, default=func.now())

    # Relationships
    group_chat = relationship("GroupChat", back_populates="members")
    user = relationship("User")


class GroupMessage(Base):
    __tablename__ = "group_messages"

    id = Column(Integer, primary_key=True, index=True)
    group_chat_id = Column(Integer, ForeignKey("group_chats.id"), nullable=False)
    sender_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    message_type = Column(Enum(MessageType), default=MessageType.TEXT)
    content = Column(Text, nullable=False)
    file_url = Column(String, nullable=True)
    created_at = Column(DateTime, nullable=False, default=func.now())

    # Relationships
    group_chat = relationship("GroupChat", back_populates="messages")
    sender = relationship("User")