"""
Naue Roll Calculator - Beta
Flask app with HTTP Basic Authentication
"""

from flask import Flask, render_template, request, send_file, send_from_directory, jsonify
from flask_httpauth import HTTPBasicAuth
from functools import wraps
import os
from datetime import datetime
import json

app = Flask(__name__)
auth = HTTPBasicAuth()

# ============================================================================
# CONFIGURATION
# ============================================================================

# Benutzer für Beta-Phase (in Produktion aus env-Variablen laden!)
BETA_USERS = {
    "beta": "rollcalc_beta_2026",   # ⚠️ ÄNDERN!
    "naue": "naue_access_2026",     # ⚠️ ÄNDERN!
    "cniehues": "beta_test_2026",   # ⚠️ ÄNDERN!
    "lvollmert": "Geheim!",         # ⚠️ ÄNDERN!
    "mtazl": "rollcalc",            # ⚠️ ÄNDERN!
    "controlling": "beta2026"       # ⚠️ ÄNDERN!
}

# Optional: Admin-Features (z.B. Logs, Stats)
ADMIN_USERS = {
    "admin": "admin_secure_pwd_2026"  # ⚠️ ÄNDERN!
}

# Logging für Auditing
LOG_FILE = "access_log.json"

# ============================================================================
# AUTHENTICATION
# ============================================================================

@auth.verify_password
def verify_password(username, password):
    """Verify HTTP Basic Auth credentials"""
    all_users = {**BETA_USERS, **ADMIN_USERS}
    if username in all_users and all_users[username] == password:
        return username
    return None

def log_access(username, endpoint, method, status=200):
    """Log all access attempts for audit trail"""
    log_entry = {
        "timestamp": datetime.now().isoformat(),
        "username": username,
        "endpoint": endpoint,
        "method": method,
        "status": status
    }
    try:
        logs = []
        if os.path.exists(LOG_FILE):
            with open(LOG_FILE, "r") as f:
                logs = json.load(f)
        logs.append(log_entry)
        with open(LOG_FILE, "w") as f:
            json.dump(logs, f, indent=2)
    except Exception as e:
        print(f"[Logging Error] {e}")

# ============================================================================
# ROUTES
# ============================================================================

@app.route("/", methods=["GET"])
@auth.login_required
def index():
    """Main calculator page - requires authentication"""
    log_access(auth.current_user(), "/", "GET")
    return render_template("roll_calculator.html")

@app.route("/static/<path:filename>", methods=["GET"])
@auth.login_required
def serve_static(filename):
    """Serve static files (CSS, JS, JSON) - protected"""
    log_access(auth.current_user(), f"/static/{filename}", "GET")
    return send_from_directory("static", filename)

@app.route("/api/health", methods=["GET"])
@auth.login_required
def health_check():
    """Simple health check endpoint"""
    return jsonify({"status": "ok", "version": "14.1"}), 200

@app.route("/api/user", methods=["GET"])
@auth.login_required
def get_user():
    """Get current authenticated user info"""
    user = auth.current_user()
    is_admin = user in ADMIN_USERS
    return jsonify({
        "username": user,
        "authenticated": True,
        "is_admin": is_admin,
        "timestamp": datetime.now().isoformat()
    }), 200

@app.route("/admin/logs", methods=["GET"])
@auth.login_required
def get_logs():
    """View access logs - admin only"""
    user = auth.current_user()
    if user not in ADMIN_USERS:
        log_access(user, "/admin/logs", "GET", 403)
        return jsonify({"error": "Unauthorized"}), 403
    
    log_access(user, "/admin/logs", "GET")
    logs = []
    if os.path.exists(LOG_FILE):
        with open(LOG_FILE, "r") as f:
            logs = json.load(f)
    return jsonify({"logs": logs}), 200

# ============================================================================
# ERROR HANDLERS
# ============================================================================

@app.errorhandler(401)
def unauthorized(e):
    """Handle 401 Unauthorized - browser will prompt for credentials"""
    return jsonify({"error": "Unauthorized - please provide valid credentials"}), 401

@app.errorhandler(404)
def not_found(e):
    """Handle 404 Not Found"""
    return jsonify({"error": "Not found"}), 404

@app.errorhandler(500)
def internal_error(e):
    """Handle 500 Internal Server Error"""
    return jsonify({"error": "Internal server error"}), 500

# ============================================================================
# STARTUP
# ============================================================================

if __name__ == "__main__":
    os.makedirs("templates", exist_ok=True)
    os.makedirs("static", exist_ok=True)
    
    print("""
    ╔═══════════════════════════════════════════════════════════╗
    ║  Naue Roll Calculator - V14 + QoL Update                 ║
    ║  HTTP Basic Auth Enabled                                 ║
    ║                                                           ║
    ║  ⚠️  BEFORE PRODUCTION: Update passwords in app.py       ║
    ║                                                           ║
    ║  Starten auf: http://localhost:5000                     ║
    ╚═══════════════════════════════════════════════════════════╝
    """)
    
    app.run(
        host="127.0.0.1",
        port=5000,
        debug=False,
        use_reloader=False
    )