"""Flask Application Factory."""
import os

from flask import Flask

from config import config
from app.extensions import cors, limiter, talisman, init_celery
from app.services.account_service import init_account_db


def create_app(config_name=None):
    """Create and configure the Flask application."""
    if config_name is None:
        config_name = os.getenv("FLASK_ENV", "development")

    app = Flask(__name__)
    app.config.from_object(config[config_name])

    # Create upload/output/database directories
    os.makedirs(app.config["UPLOAD_FOLDER"], exist_ok=True)
    os.makedirs(app.config["OUTPUT_FOLDER"], exist_ok=True)
    db_dir = os.path.dirname(app.config["DATABASE_PATH"])
    if db_dir:
        os.makedirs(db_dir, exist_ok=True)

    # Initialize extensions
    cors.init_app(
        app,
        origins=app.config["CORS_ORIGINS"],
        supports_credentials=True,
    )

    limiter.init_app(app)

    # Talisman security headers (relaxed CSP for AdSense)
    csp = {
        "default-src": "'self'",
        "script-src": [
            "'self'",
            "'unsafe-inline'",
            "https://pagead2.googlesyndication.com",
            "https://www.googletagmanager.com",
            "https://www.google-analytics.com",
        ],
        "style-src": ["'self'", "'unsafe-inline'", "https://fonts.googleapis.com"],
        "font-src": ["'self'", "https://fonts.gstatic.com"],
        "img-src": [
            "'self'",
            "data:",
            "https://pagead2.googlesyndication.com",
            "https://tpc.googlesyndication.com",
            "https://www.google-analytics.com",
        ],
        "frame-src": [
            "https://googleads.g.doubleclick.net",
            "https://tpc.googlesyndication.com",
        ],
        "connect-src": [
            "'self'",
            "https://www.google-analytics.com",
            "https://pagead2.googlesyndication.com",
            "https://*.amazonaws.com",
        ],
    }
    talisman.init_app(
        app,
        content_security_policy=csp,
        force_https=config_name == "production",
    )

    # Initialize Celery
    init_celery(app)

    with app.app_context():
        init_account_db()

    # Register blueprints
    from app.routes.health import health_bp
    from app.routes.auth import auth_bp
    from app.routes.account import account_bp
    from app.routes.admin import admin_bp
    from app.routes.convert import convert_bp
    from app.routes.compress import compress_bp
    from app.routes.image import image_bp
    from app.routes.video import video_bp
    from app.routes.history import history_bp
    from app.routes.tasks import tasks_bp
    from app.routes.download import download_bp
    from app.routes.pdf_tools import pdf_tools_bp
    from app.routes.flowchart import flowchart_bp
    from app.routes.v1.tools import v1_bp

    app.register_blueprint(health_bp, url_prefix="/api")
    app.register_blueprint(auth_bp, url_prefix="/api/auth")
    app.register_blueprint(account_bp, url_prefix="/api/account")
    app.register_blueprint(admin_bp, url_prefix="/api/internal/admin")
    app.register_blueprint(convert_bp, url_prefix="/api/convert")
    app.register_blueprint(compress_bp, url_prefix="/api/compress")
    app.register_blueprint(image_bp, url_prefix="/api/image")
    app.register_blueprint(video_bp, url_prefix="/api/video")
    app.register_blueprint(history_bp, url_prefix="/api")
    app.register_blueprint(pdf_tools_bp, url_prefix="/api/pdf-tools")
    app.register_blueprint(flowchart_bp, url_prefix="/api/flowchart")
    app.register_blueprint(tasks_bp, url_prefix="/api/tasks")
    app.register_blueprint(download_bp, url_prefix="/api/download")
    app.register_blueprint(v1_bp, url_prefix="/api/v1")

    return app