"""
MySQL Database Configuration for Epic Travel & Expeditions
Uses SQLAlchemy for MySQL connection
"""
from sqlalchemy import create_engine, Column, String, Text, Numeric, DateTime, JSON, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from datetime import datetime
import os
from dotenv import load_dotenv
from pathlib import Path

# Load environment variables
ROOT_DIR = Path(__file__).parent
load_dotenv(ROOT_DIR / '.env')

# MySQL Database URL
MYSQL_USER = os.environ.get('MYSQL_USER')
MYSQL_PASSWORD = os.environ.get('MYSQL_PASSWORD')
MYSQL_HOST = os.environ.get('MYSQL_HOST', 'localhost')
MYSQL_PORT = os.environ.get('MYSQL_PORT', '3306')
MYSQL_DATABASE = os.environ.get('MYSQL_DATABASE')

DATABASE_URL = f"mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DATABASE}?charset=utf8mb4"

# Create engine
engine = create_engine(DATABASE_URL, pool_pre_ping=True, pool_recycle=3600)

# Create session
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Base class for models
Base = declarative_base()

# Database Models
class Destination(Base):
    __tablename__ = "destinations"
    
    id = Column(String(36), primary_key=True)
    name = Column(String(255), nullable=False, index=True)
    location = Column(String(255), nullable=False, index=True)
    description = Column(Text, nullable=False)
    image = Column(String(500), nullable=False)
    category = Column(String(50), nullable=False, index=True)
    rating = Column(Numeric(2, 1), nullable=False, default=4.5)
    price = Column(Numeric(10, 2), nullable=False)
    currency = Column(String(3), nullable=False, default='USD')
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)
    
    # Relationship
    specials = relationship("Special", back_populates="destination", cascade="all, delete-orphan")


class Special(Base):
    __tablename__ = "specials"
    
    id = Column(String(36), primary_key=True)
    destination_id = Column(String(36), ForeignKey('destinations.id', ondelete='CASCADE'), nullable=False, index=True)
    discount = Column(Numeric(5, 2), nullable=False)
    end_date = Column(String(10), nullable=False)  # Store as string YYYY-MM-DD
    highlights = Column(JSON, nullable=False)
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)
    
    # Relationship
    destination = relationship("Destination", back_populates="specials")


class AdminUser(Base):
    __tablename__ = "admin_users"
    
    id = Column(String(36), primary_key=True)
    email = Column(String(255), nullable=False, unique=True, index=True)
    password_hash = Column(String(255), nullable=False)
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)


class Contact(Base):
    __tablename__ = "contacts"
    
    id = Column(String(36), primary_key=True)
    name = Column(String(255), nullable=False)
    email = Column(String(255), nullable=False)
    message = Column(Text, nullable=False)
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow, index=True)


class NewsletterSubscriber(Base):
    __tablename__ = "newsletter_subscribers"
    
    id = Column(String(36), primary_key=True)
    email = Column(String(255), nullable=False, unique=True, index=True)
    subscribed_at = Column(DateTime, nullable=False, default=datetime.utcnow)


# Dependency to get database session
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


# Create all tables (if they don't exist)
def create_tables():
    Base.metadata.create_all(bind=engine)


if __name__ == "__main__":
    print("Creating database tables...")
    create_tables()
    print("Database tables created successfully!")
