from sqlalchemy import Column, Integer, String, Text, ForeignKey, DateTime, TIMESTAMP
from sqlalchemy.orm import relationship
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.sql import func

Base = declarative_base()

class UploadLog(Base):
    __tablename__ = "upload_logs"
    id = Column(Integer, primary_key=True, index=True)
    filename = Column(String, nullable=False)
    table_name = Column(String, nullable=False)
    file_type = Column(String, nullable=False)
    rows_count = Column(Integer)
    uploaded_at = Column(TIMESTAMP, server_default=func.now())
    status = Column(String)
    message = Column(Text)


class Institution(Base):
    __tablename__ = "institutions"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String(100), unique=True, nullable=False)
    address = Column(String(200), nullable=True)

    users = relationship("User", back_populates="institution")


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String(50), unique=True, nullable=False)
    password_hash = Column(String(255), nullable=False)
    role = Column(String(50), nullable=False, default="user")  # <── Added role
    institution_id = Column(Integer, ForeignKey("institutions.id"), nullable=True)
    active_token = Column(String(255), nullable=True)
    token_expired_at = Column(DateTime, nullable=True)
    last_login = Column(DateTime, nullable=True)

    institution = relationship("Institution", back_populates="users")