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"""
Flask ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ดˆ๊ธฐํ™”
"""

from flask import Flask
from flask_login import LoginManager
import sqlite3
from pathlib import Path
from typing import Optional

from app.database import db, User
from app.core.config import Config, get_config
from app.core.logger import get_logger

logger = get_logger(__name__)

login_manager = LoginManager()
login_manager.login_view = 'main.login'
login_manager.login_message = '๋กœ๊ทธ์ธ์ด ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค.'
login_manager.login_message_category = 'info'


@login_manager.user_loader
def load_user(user_id: str) -> Optional[User]:
    """
    ์‚ฌ์šฉ์ž ๋กœ๋“œ ํ•จ์ˆ˜ (Flask-Login์šฉ)
    
    Args:
        user_id: ์‚ฌ์šฉ์ž ID (๋ฌธ์ž์—ด)
    
    Returns:
        User ๊ฐ์ฒด ๋˜๋Š” None
    """
    try:
        return User.query.get(int(user_id))
    except (ValueError, TypeError):
        return None


def create_app() -> Flask:
    """
    Flask ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ํŒฉํ† ๋ฆฌ ํ•จ์ˆ˜
    
    Returns:
        ์„ค์ •๋œ Flask ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ธ์Šคํ„ด์Šค
    """
    config = get_config()
    
    # ํ•„์ˆ˜ ๋””๋ ‰ํ† ๋ฆฌ ์ƒ์„ฑ
    config.ensure_directories()
    
    # ํ…œํ”Œ๋ฆฟ ํด๋” ๋ฐ static ํด๋” ๊ฒฝ๋กœ ์„ค์ •
    template_folder = str(config.TEMPLATES_FOLDER)
    static_folder = str(config.STATIC_FOLDER)
    
    app = Flask(__name__, template_folder=template_folder, static_folder=static_folder)
    
    # Flask ์„ค์ • ์ ์šฉ
    app.config['SECRET_KEY'] = config.SECRET_KEY
    app.config['SQLALCHEMY_DATABASE_URI'] = config.SQLALCHEMY_DATABASE_URI
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = config.SQLALCHEMY_TRACK_MODIFICATIONS
    app.config['MAX_CONTENT_LENGTH'] = config.MAX_CONTENT_LENGTH
    
    # ํ™•์žฅ ์ดˆ๊ธฐํ™”
    db.init_app(app)
    login_manager.init_app(app)
    
    # Blueprint ๋“ฑ๋ก
    from app.routes import main_bp
    app.register_blueprint(main_bp)
    
    # ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์ดˆ๊ธฐํ™” ๋ฐ ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜
    with app.app_context():
        db.create_all()
        migrate_database(app)
        create_admin_user()
    
    logger.info("Flask ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์ด ์ดˆ๊ธฐํ™”๋˜์—ˆ์Šต๋‹ˆ๋‹ค.")
    
    return app


def migrate_database(app: Flask) -> None:
    """
    ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ์‹คํ–‰
    
    Args:
        app: Flask ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ธ์Šคํ„ด์Šค
    """
    try:
        db_uri = app.config['SQLALCHEMY_DATABASE_URI']
        
        if not db_uri.startswith('sqlite:///'):
            logger.warning(f"SQLite๊ฐ€ ์•„๋‹Œ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค๋Š” ์ž๋™ ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜์ด ์ง€์›๋˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค: {db_uri}")
            return
        
        db_path_str = db_uri.replace('sqlite:///', '')
        db_path = Path(db_path_str)
        
        # ์ƒ๋Œ€ ๊ฒฝ๋กœ์ธ ๊ฒฝ์šฐ instance ํด๋” ๊ธฐ์ค€์œผ๋กœ ์ฒ˜๋ฆฌ
        if not db_path.is_absolute():
            db_path = Path(app.instance_path) / db_path
        
        if not db_path.exists():
            logger.info(f"๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ํŒŒ์ผ์ด ์—†์Šต๋‹ˆ๋‹ค (์ƒˆ๋กœ ์ƒ์„ฑ๋จ): {db_path}")
            return
        
        logger.info(f"๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ์‹œ์ž‘: {db_path}")
        
        conn = sqlite3.connect(str(db_path))
        cursor = conn.cursor()
        
        # user ํ…Œ์ด๋ธ”์— nickname ์ปฌ๋Ÿผ์ด ์žˆ๋Š”์ง€ ํ™•์ธ
        cursor.execute("PRAGMA table_info(user)")
        user_columns = [column[1] for column in cursor.fetchall()]
        
        if 'nickname' not in user_columns:
            logger.info("user ํ…Œ์ด๋ธ”์— nickname ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์ค‘...")
            cursor.execute("ALTER TABLE user ADD COLUMN nickname VARCHAR(80)")
            conn.commit()
            logger.info("user.nickname ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์™„๋ฃŒ")
        
        # uploaded_file ํ…Œ์ด๋ธ”์ด ์กด์žฌํ•˜๋Š”์ง€ ํ™•์ธ
        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='uploaded_file'")
        if cursor.fetchone():
            cursor.execute("PRAGMA table_info(uploaded_file)")
            uploaded_file_columns = [column[1] for column in cursor.fetchall()]
            
            if 'uploaded_by' not in uploaded_file_columns:
                logger.info("uploaded_file ํ…Œ์ด๋ธ”์— uploaded_by ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์ค‘...")
                cursor.execute("ALTER TABLE uploaded_file ADD COLUMN uploaded_by INTEGER")
                conn.commit()
                logger.info("uploaded_file.uploaded_by ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์™„๋ฃŒ")
            
            if 'parent_file_id' not in uploaded_file_columns:
                logger.info("uploaded_file ํ…Œ์ด๋ธ”์— parent_file_id ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์ค‘...")
                cursor.execute("ALTER TABLE uploaded_file ADD COLUMN parent_file_id INTEGER")
                conn.commit()
                logger.info("uploaded_file.parent_file_id ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์™„๋ฃŒ")
        
        # document_chunk ํ…Œ์ด๋ธ”์ด ์กด์žฌํ•˜๋Š”์ง€ ํ™•์ธ
        cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='document_chunk'")
        if cursor.fetchone():
            cursor.execute("PRAGMA table_info(document_chunk)")
            document_chunk_columns = [column[1] for column in cursor.fetchall()]
            
            if 'chunk_metadata' not in document_chunk_columns:
                logger.info("document_chunk ํ…Œ์ด๋ธ”์— chunk_metadata ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์ค‘...")
                cursor.execute("ALTER TABLE document_chunk ADD COLUMN chunk_metadata TEXT")
                conn.commit()
                logger.info("document_chunk.chunk_metadata ์ปฌ๋Ÿผ ์ถ”๊ฐ€ ์™„๋ฃŒ")
        
        conn.close()
        logger.info("๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ์™„๋ฃŒ")
        
    except sqlite3.Error as e:
        logger.error(f"๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ์ค‘ SQLite ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {e}", exc_info=True)
    except Exception as e:
        logger.error(f"๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜ ์ค‘ ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {e}", exc_info=True)


def create_admin_user() -> None:
    """
    ์ดˆ๊ธฐ ๊ด€๋ฆฌ์ž ๊ณ„์ • ์ƒ์„ฑ
    """
    admin_username = 'soymedia'
    admin_password = 's0ymedi@1@34'
    
    try:
        admin = User.query.filter_by(username=admin_username).first()
        if not admin:
            admin = User(username=admin_username, is_admin=True, is_active=True)
            admin.set_password(admin_password)
            db.session.add(admin)
            db.session.commit()
            logger.info(f'๊ด€๋ฆฌ์ž ๊ณ„์ •์ด ์ƒ์„ฑ๋˜์—ˆ์Šต๋‹ˆ๋‹ค: {admin_username}')
        else:
            logger.debug(f'๊ด€๋ฆฌ์ž ๊ณ„์ •์ด ์ด๋ฏธ ์กด์žฌํ•ฉ๋‹ˆ๋‹ค: {admin_username}')
    except Exception as e:
        logger.error(f'๊ด€๋ฆฌ์ž ๊ณ„์ • ์ƒ์„ฑ ์ค‘ ์˜ค๋ฅ˜ ๋ฐœ์ƒ: {e}', exc_info=True)
        db.session.rollback()