"""
Election Process Assistant Application
Helps users understand the election process, timelines, and steps interactively.
"""

from flask import Flask, request
from flask_sqlalchemy import SQLAlchemy
from flask_cors import CORS
from flask_socketio import SocketIO, emit
import os
import logging

db = SQLAlchemy()
socketio = SocketIO(cors_allowed_origins="*")

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s [%(levelname)s] %(name)s: %(message)s',
)
logger = logging.getLogger(__name__)


def create_app(config_name: str = 'development') -> Flask:
    """
    Application factory for creating Flask app instances.

    Args:
        config_name: One of 'development', 'testing', 'production'

    Returns:
        Configured Flask application
    """
    basedir = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
    app = Flask(
        __name__,
        template_folder=os.path.join(basedir, 'templates'),
        static_folder=os.path.join(basedir, 'static'),
    )

    # ── Configuration ────────────────────────────────────
    from app.config import CONFIG_MAP
    app.config.from_object(CONFIG_MAP.get(config_name, CONFIG_MAP['development']))

    # ── Extensions ───────────────────────────────────────
    db.init_app(app)
    CORS(app, resources={r"/api/*": {"origins": "*"}})
    socketio.init_app(app)

    # ── Security headers ─────────────────────────────────
    from app.security import apply_security_headers
    app.after_request(apply_security_headers)

    # ── Blueprints ───────────────────────────────────────
    from app.routes import main_bp, api_bp
    app.register_blueprint(main_bp)
    app.register_blueprint(api_bp, url_prefix='/api')

    # ── WebSocket handlers ───────────────────────────────
    @socketio.on('connect')
    def handle_connect(data=None):
        from app.realtime import handle_client_connected
        handle_client_connected(request.sid, data)
        logger.info('WebSocket client connected: %s', request.sid)

    @socketio.on('disconnect')
    def handle_disconnect():
        from app.realtime import handle_client_disconnected
        handle_client_disconnected(request.sid)
        logger.info('WebSocket client disconnected: %s', request.sid)

    @socketio.on('request_timeline')
    def handle_timeline_request():
        from app.realtime import stream_timeline_events
        emit('timeline_data', {'events': stream_timeline_events()})

    @socketio.on('request_stats')
    def handle_stats_request():
        from app.realtime import get_live_stats
        emit('live_stats', get_live_stats())

    # ── DB bootstrap ─────────────────────────────────────
    with app.app_context():
        db.create_all()
        from app.models import seed_election_data
        seed_election_data()
        logger.info('Database initialized and seeded for %s', config_name)

    return app