import os
from flask import Flask, jsonify, request
from flask_cors import CORS
from dotenv import load_dotenv
import logging
from logging.handlers import RotatingFileHandler
import pymongo
import datetime
import secrets

# Import Database early for logging connection
from db import Database

# Import routes
from routes.department_routes import department_bp
from routes.auth_routes import auth_bp
from routes.workflow_routes import workflow_bp
from routes.log_routes import log_bp
from routes.incident_routes import incident_bp
from routes.user_routes import user_bp

# Load environment variables
load_dotenv()

# Create Flask app
app = Flask(__name__)

# Setup basic logging configuration first
log_dir = '/tmp/logs'
log_file = f"{log_dir}/app.log"
try:
    if not os.path.exists(log_dir):
        os.makedirs(log_dir)
    handler = RotatingFileHandler(log_file, maxBytes=100000, backupCount=5)
    log_level = logging.INFO
    handler.setLevel(log_level)
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    handler.setFormatter(formatter)
    app.logger.addHandler(handler)
    # Also add console logging
    console_handler = logging.StreamHandler()
    console_handler.setLevel(log_level)
    console_handler.setFormatter(formatter)
    app.logger.addHandler(console_handler)
    
    app.logger.setLevel(log_level)
    app.logger.info('File logging configured successfully.')
except Exception as e:
    # If file logging fails, ensure console logging is set up
    if not any(isinstance(h, logging.StreamHandler) for h in app.logger.handlers):
        console_handler = logging.StreamHandler()
        console_handler.setLevel(logging.INFO)
        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
        console_handler.setFormatter(formatter)
        app.logger.addHandler(console_handler)
        app.logger.setLevel(logging.INFO)
    app.logger.warning(f"Could not set up file logging to {log_file}: {str(e)}. Logging to console.")

app.logger.info('Flask app created.')

# Configure secrets with fallbacks for development
app.config['SECRET_KEY'] = os.environ.get('JWT_SECRET') or secrets.token_hex(32)
app.config['MONGO_URI'] = os.environ.get('MONGO_URI')
app.logger.info('App secrets configured.')

# Verify essential environment variables
missing_vars = []
required_env_vars = ['MONGO_URI', 'OPENAI_API_KEY']
for var in required_env_vars:
    if not os.environ.get(var):
        missing_vars.append(var)

if missing_vars:
    app.logger.warning(f"Missing essential environment variables: {', '.join(missing_vars)}")
    app.logger.warning("Please create a .env file or set Space secrets.")
else:
    app.logger.info("All essential environment variables are present.")

# Database Connection Test
try:
    db_instance = Database.get_instance()
    db = db_instance.get_db()
    db.command('ping')
    app.logger.info("Successfully connected to MongoDB.")
except Exception as e:
    app.logger.error(f"Failed to connect to MongoDB: {str(e)}")
    # Depending on severity, you might want to exit or prevent app run

# Configure OpenAI API key
if 'OPENAI_API_KEY' in os.environ:
    try:
        # We don't need to initialize the client globally
        # It will be initialized in each function that needs it
        app.logger.info("OpenAI API key available.")
    except Exception as e:
        app.logger.error(f"Failed to import OpenAI: {str(e)}")
else:
    app.logger.warning("OPENAI_API_KEY not found in environment variables.")

# Enable CORS with specific origins
origins = [
    "http://localhost:3000",  # Development frontend
    "https://www.tryenflow.com",  # Production frontend
    "https://droov-enflow-api.hf.space" # Add the Hugging Face Space URL
]
try:
    CORS(app, resources={r"/api/*": {"origins": origins}}, supports_credentials=True)
    app.logger.info(f"CORS configured for origins: {origins}")
except Exception as e:
    app.logger.error(f"Failed to configure CORS: {str(e)}")

# Register blueprints
try:
    app.register_blueprint(auth_bp, url_prefix='/api/auth')
    app.register_blueprint(department_bp, url_prefix='/api/departments')
    app.register_blueprint(workflow_bp, url_prefix='/api/workflows')
    app.register_blueprint(log_bp, url_prefix='/api/logs')
    app.register_blueprint(incident_bp, url_prefix='/api/incidents')
    app.register_blueprint(user_bp, url_prefix='/api/users')
    app.logger.info("All API blueprints registered successfully.")
except Exception as e:
    app.logger.error(f"Failed to register blueprints: {str(e)}")

# Set up uploads directory in /tmp (which should be writable)
app.config['UPLOAD_FOLDER'] = '/tmp/uploads'
if not os.path.exists(app.config['UPLOAD_FOLDER']):
    try:
        os.makedirs(app.config['UPLOAD_FOLDER'])
        app.logger.info(f"Uploads directory created at {app.config['UPLOAD_FOLDER']}")
    except PermissionError:
        app.logger.warning(f"Permission denied creating {app.config['UPLOAD_FOLDER']}. Using /tmp fallback.")
        app.config['UPLOAD_FOLDER'] = '/tmp'
    except Exception as e:
        app.logger.error(f"Error creating uploads directory {app.config['UPLOAD_FOLDER']}: {str(e)}")

# Error handler
@app.errorhandler(Exception)
def handle_exception(e):
    # Log the actual exception trace
    app.logger.exception(f"Unhandled exception: {str(e)}") 
    return jsonify({"error": "An unexpected internal error occurred"}), 500

# Root route
@app.route('/')
def index():
    app.logger.debug("Root route / accessed")
    return jsonify({
        "message": "Enflow API is running",
        "version": "1.0.0"
    })

# Test route that doesn't require authentication
@app.route('/api/test')
def test_route():
    app.logger.info("/api/test route accessed")
    return jsonify({
        "message": "API test successful",
        "timestamp": datetime.datetime.now().isoformat(),
        "environment": os.environ.get('FLASK_DEBUG', '0') # Use FLASK_DEBUG now
    })

# Health check route
@app.route('/health')
def health_check():
    app.logger.info("Health check requested")
    db_status = "unknown"
    env_status = "ok"
    error_details = ""
    status_code = 200
    
    try:
        # Check MongoDB connection
        db = Database.get_instance().get_db()
        db.command('ping')
        db_status = "connected"
        app.logger.info("Health Check: MongoDB connection successful.")
    except Exception as e:
        db_status = "disconnected"
        error_details += f"MongoDB Error: {str(e)}; "
        app.logger.error(f"Health Check: MongoDB connection failed: {str(e)}")
        status_code = 503 # Service Unavailable
        
    # Check environment variables
    if missing_vars:
        env_status = f"Missing: {', '.join(missing_vars)}"
        if status_code == 200: # Don't downgrade status if DB already failed
             status_code = 500 # Internal Server Error for config issue
        error_details += f"Missing environment variables: {', '.join(missing_vars)}; "
        app.logger.warning(f"Health Check: Missing environment variables: {', '.join(missing_vars)}")

    response = {
        "status": "healthy" if status_code == 200 else "unhealthy",
        "mongo": db_status,
        "env_vars": env_status,
        "upload_dir_exists": os.path.exists(app.config.get('UPLOAD_FOLDER', '/tmp')),
        "log_dir_exists": os.path.exists(log_dir)
    }
    if error_details:
        response["errors"] = error_details.strip()
        
    return jsonify(response), status_code

# Logging setup moved to the top

if __name__ == '__main__':
    # Use FLASK_DEBUG instead of FLASK_ENV for debug mode control
    debug_mode = os.environ.get('FLASK_DEBUG', '0') == '1'
    # Port configuration - Hugging Face might override this via its execution environment
    port = int(os.environ.get('PORT', 7860)) # Default to 7860 if PORT env var not set
    app.logger.info(f"Starting Flask app. Debug mode: {debug_mode}. Port: {port}")
    # Note: When running via gunicorn (common in HF), gunicorn command sets the port,
    # and this app.run() is not executed directly.
    # The port setting here is mainly for local `python app.py` execution.
    app.run(host='0.0.0.0', port=port, debug=debug_mode)