"""
Vereinheitlichtes User-Management-Blueprint für das MYP System

Konsolidierte Implementierung aller benutzerbezogenen Funktionen:
- Benutzer-Selbstverwaltung (ursprünglich user.py)
- Administrative Benutzerverwaltung (ursprünglich users.py)
- Vereinheitlichte API-Schnittstellen

Funktionsbereiche:
- /user/*           - Selbstverwaltung für eingeloggte Benutzer
- /admin/users/*    - Administrative Benutzerverwaltung
- /api/users/*      - Unified API Layer

Optimierungen:
- Einheitliche Database-Session-Verwaltung
- Konsistente Error-Handling und Logging
- Vollständige API-Kompatibilität zu beiden ursprünglichen Blueprints

Autor: MYP Team - Konsolidiert für IHK-Projektarbeit
Datum: 2025-06-09
"""

import json
from datetime import datetime
from flask import Blueprint, render_template, request, jsonify, redirect, url_for, flash, make_response, abort
from flask_login import login_required, current_user
from werkzeug.security import check_password_hash
from sqlalchemy.exc import SQLAlchemyError
from functools import wraps
from models import User, UserPermission, get_cached_session
from utils.logging_config import get_logger

# ===== BLUEPRINT-KONFIGURATION =====

# Hauptblueprint für User-Management
users_blueprint = Blueprint('users', __name__)

# Logger für verschiedene Funktionsbereiche
user_logger = get_logger("user")
users_logger = get_logger("users")

# ===== DECORATOR-FUNKTIONEN =====

def users_admin_required(f):
    """
    Decorator für Admin-Berechtigung bei Benutzerverwaltung.
    Erweitert den Standard-Admin-Check um spezifische User-Management-Rechte.
    """
    @wraps(f)
    @login_required
    def decorated_function(*args, **kwargs):
        # Grundlegende Admin-Prüfung
        if not current_user.is_authenticated:
            users_logger.warning("Unauthenticated access attempt to user management")
            abort(401)
        
        # Admin-Status prüfen (doppelte Methode für Robustheit)
        is_admin = False
        if hasattr(current_user, 'is_admin') and current_user.is_admin:
            is_admin = True
        elif hasattr(current_user, 'role') and current_user.role == 'admin':
            is_admin = True
        
        if not is_admin:
            users_logger.warning(f"Non-admin user {current_user.id} attempted to access user management")
            abort(403)
        
        users_logger.info(f"Admin access granted to {current_user.username} for function {f.__name__}")
        return f(*args, **kwargs)
    return decorated_function

# ===== BENUTZER-SELBSTVERWALTUNG (ursprünglich user.py) =====

@users_blueprint.route('/user/profile', methods=['GET'])
@login_required
def user_profile():
    """Benutzerprofil-Seite anzeigen"""
    try:
        user_logger.info(f"User {current_user.username} accessed profile page")
        return render_template('profile.html', user=current_user)
    except Exception as e:
        user_logger.error(f"Error loading profile page: {str(e)}")
        flash("Fehler beim Laden des Profils", "error")
        return redirect(url_for('dashboard'))

@users_blueprint.route('/user/settings', methods=['GET'])
@login_required
def user_settings():
    """Benutzereinstellungen-Seite anzeigen"""
    try:
        user_logger.info(f"User {current_user.username} accessed settings page")
        return render_template('settings.html', user=current_user)
    except Exception as e:
        user_logger.error(f"Error loading settings page: {str(e)}")
        flash("Fehler beim Laden der Einstellungen", "error")
        return redirect(url_for('dashboard'))

@users_blueprint.route('/user/update-profile', methods=['POST'])
@login_required
def update_profile_form():
    """Profil via Formular aktualisieren"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                flash("Benutzer nicht gefunden", "error")
                return redirect(url_for('users.user_profile'))
            
            # Formular-Daten extrahieren
            user.name = request.form.get('name', user.name)
            user.email = request.form.get('email', user.email)
            user.department = request.form.get('department', user.department)
            user.position = request.form.get('position', user.position)
            user.phone = request.form.get('phone', user.phone)
            user.bio = request.form.get('bio', user.bio)
            user.updated_at = datetime.now()
            
            session.commit()
        
        user_logger.info(f"User {user.username} updated profile via form")
        flash("Profil erfolgreich aktualisiert", "success")
        return redirect(url_for('users.user_profile'))
        
    except Exception as e:
        user_logger.error(f"Error updating profile via form: {str(e)}")
        flash("Fehler beim Aktualisieren des Profils", "error")
        return redirect(url_for('users.user_profile'))

@users_blueprint.route('/user/profile', methods=['PUT'])
@login_required
def update_profile_api():
    """Profil via API aktualisieren"""
    try:
        data = request.get_json()
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            # API-Daten verarbeiten
            updatable_fields = ['name', 'email', 'department', 'position', 'phone', 'bio']
            for field in updatable_fields:
                if field in data:
                    setattr(user, field, data[field])
            
            user.updated_at = datetime.now()
            session.commit()
        
        user_logger.info(f"User {user.username} updated profile via API")
        return jsonify({
            "success": True,
            "message": "Profil erfolgreich aktualisiert"
        })
        
    except Exception as e:
        user_logger.error(f"Error updating profile via API: {str(e)}")
        return jsonify({"error": "Fehler beim Aktualisieren des Profils"}), 500

@users_blueprint.route('/api/user/settings', methods=['GET', 'POST'])
@login_required
def user_settings_api():
    """Benutzereinstellungen via API abrufen oder aktualisieren"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            if request.method == 'GET':
                # Einstellungen abrufen
                settings = {
                    'theme_preference': getattr(user, 'theme_preference', 'auto'),
                    'language_preference': getattr(user, 'language_preference', 'de'),
                    'email_notifications': getattr(user, 'email_notifications', True),
                    'browser_notifications': getattr(user, 'browser_notifications', True),
                    'dashboard_layout': getattr(user, 'dashboard_layout', 'default'),
                    'compact_mode': getattr(user, 'compact_mode', False),
                    'show_completed_jobs': getattr(user, 'show_completed_jobs', True),
                    'auto_refresh_interval': getattr(user, 'auto_refresh_interval', 30),
                    'privacy': {
                        'auto_logout': getattr(user, 'auto_logout_timeout', 0)
                    }
                }
                
                user_logger.info(f"User {user.username} retrieved settings via API")
                return jsonify({
                    "success": True,
                    "settings": settings
                })
            
            elif request.method == 'POST':
                # Einstellungen aktualisieren
                data = request.get_json()
                
                # Einstellungen aktualisieren
                settings_fields = [
                    'theme_preference', 'language_preference', 'email_notifications',
                    'browser_notifications', 'dashboard_layout', 'compact_mode',
                    'show_completed_jobs', 'auto_refresh_interval'
                ]
                
                for field in settings_fields:
                    if field in data:
                        setattr(user, field, data[field])
                
                # Privacy-Einstellungen
                if 'privacy' in data and isinstance(data['privacy'], dict):
                    if 'auto_logout' in data['privacy']:
                        user.auto_logout_timeout = data['privacy']['auto_logout']
                
                user.updated_at = datetime.now()
                session.commit()
                
                user_logger.info(f"User {user.username} updated settings via API")
                return jsonify({
                    "success": True,
                    "message": "Einstellungen erfolgreich aktualisiert"
                })
        
    except Exception as e:
        user_logger.error(f"Error handling user settings API: {str(e)}")
        return jsonify({"error": "Fehler beim Verarbeiten der Einstellungen"}), 500

@users_blueprint.route('/user/api/update-settings', methods=['POST'])
@login_required
def update_settings_api():
    """Benutzereinstellungen via API aktualisieren (Legacy-Kompatibilität)"""
    try:
        data = request.get_json()
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            # Einstellungen aktualisieren
            settings_fields = [
                'theme_preference', 'language_preference', 'email_notifications',
                'browser_notifications', 'dashboard_layout', 'compact_mode',
                'show_completed_jobs', 'auto_refresh_interval'
            ]
            
            for field in settings_fields:
                if field in data:
                    setattr(user, field, data[field])
            
            user.updated_at = datetime.now()
            session.commit()
            
            user_logger.info(f"User {user.username} updated settings via API")
            return jsonify({
                "success": True,
                "message": "Einstellungen erfolgreich aktualisiert"
            })
        
    except Exception as e:
        user_logger.error(f"Error updating settings via API: {str(e)}")
        return jsonify({"error": "Fehler beim Aktualisieren der Einstellungen"}), 500

@users_blueprint.route('/user/update-settings', methods=['POST'])
@login_required
def update_settings_form():
    """Benutzereinstellungen via Formular aktualisieren"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                flash("Benutzer nicht gefunden", "error")
                return redirect(url_for('users.user_settings'))
            
            # Formular-Einstellungen verarbeiten
            user.theme_preference = request.form.get('theme_preference', user.theme_preference)
            user.language_preference = request.form.get('language_preference', user.language_preference)
            user.email_notifications = 'email_notifications' in request.form
            user.browser_notifications = 'browser_notifications' in request.form
            user.dashboard_layout = request.form.get('dashboard_layout', user.dashboard_layout)
            user.compact_mode = 'compact_mode' in request.form
            user.show_completed_jobs = 'show_completed_jobs' in request.form
            
            auto_refresh = request.form.get('auto_refresh_interval')
            if auto_refresh:
                user.auto_refresh_interval = int(auto_refresh)
            
            user.updated_at = datetime.now()
            session.commit()
            
            user_logger.info(f"User {user.username} updated settings via form")
            flash("Einstellungen erfolgreich aktualisiert", "success")
            return redirect(url_for('users.user_settings'))
        
    except Exception as e:
        user_logger.error(f"Error updating settings via form: {str(e)}")
        flash("Fehler beim Aktualisieren der Einstellungen", "error")
        return redirect(url_for('users.user_settings'))

@users_blueprint.route('/user/change-password', methods=['POST'])
@login_required
def change_password():
    """Passwort ändern (unterstützt Form und JSON)"""
    try:
        # Daten aus Request extrahieren (Form oder JSON)
        if request.is_json:
            data = request.get_json()
            current_password = data.get('current_password')
            new_password = data.get('new_password')
            confirm_password = data.get('confirm_password')
        else:
            current_password = request.form.get('current_password')
            new_password = request.form.get('new_password')
            confirm_password = request.form.get('confirm_password')
        
        # Validierung
        if not all([current_password, new_password, confirm_password]):
            error_msg = "Alle Passwort-Felder sind erforderlich"
            if request.is_json:
                return jsonify({"error": error_msg}), 400
            flash(error_msg, "error")
            return redirect(url_for('users.user_settings'))
        
        if new_password != confirm_password:
            error_msg = "Neue Passwörter stimmen nicht überein"
            if request.is_json:
                return jsonify({"error": error_msg}), 400
            flash(error_msg, "error")
            return redirect(url_for('users.user_settings'))
        
        if len(new_password) < 8:
            error_msg = "Neues Passwort muss mindestens 8 Zeichen lang sein"
            if request.is_json:
                return jsonify({"error": error_msg}), 400
            flash(error_msg, "error")
            return redirect(url_for('users.user_settings'))
        
        # Aktuelles Passwort prüfen
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user or not check_password_hash(user.password_hash, current_password):
                error_msg = "Aktuelles Passwort ist falsch"
                if request.is_json:
                    return jsonify({"error": error_msg}), 400
                flash(error_msg, "error")
                return redirect(url_for('users.user_settings'))
            
            # Neues Passwort setzen
            user.set_password(new_password)
            user.updated_at = datetime.now()
            session.commit()
        
        user_logger.info(f"User {user.username} changed password successfully")
        
        success_msg = "Passwort erfolgreich geändert"
        if request.is_json:
            return jsonify({"success": True, "message": success_msg})
        flash(success_msg, "success")
        return redirect(url_for('users.user_settings'))
        
    except Exception as e:
        user_logger.error(f"Error changing password: {str(e)}")
        error_msg = "Fehler beim Ändern des Passworts"
        if request.is_json:
            return jsonify({"error": error_msg}), 500
        flash(error_msg, "error")
        return redirect(url_for('users.user_settings'))

@users_blueprint.route('/user/export', methods=['GET'])
@login_required
def export_user_data():
    """DSGVO-konformer Datenexport für Benutzer"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == current_user.id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            # Umfassende Benutzerdaten sammeln
            user_data = {
                "export_info": {
                    "generated_at": datetime.now().isoformat(),
                    "user_id": user.id,
                    "export_type": "DSGVO_complete_data_export"
                },
                "personal_data": {
                    "username": user.username,
                    "email": user.email,
                    "name": user.name,
                    "department": user.department,
                    "position": user.position,
                    "phone": user.phone,
                    "bio": user.bio,
                    "role": user.role,
                    "active": user.active,
                    "created_at": user.created_at.isoformat() if user.created_at else None,
                    "updated_at": user.updated_at.isoformat() if user.updated_at else None,
                    "last_login": user.last_login.isoformat() if user.last_login else None
                },
                "preferences": {
                    "theme_preference": user.theme_preference,
                    "language_preference": user.language_preference,
                    "email_notifications": user.email_notifications,
                    "browser_notifications": user.browser_notifications,
                    "dashboard_layout": user.dashboard_layout,
                    "compact_mode": user.compact_mode,
                    "show_completed_jobs": user.show_completed_jobs,
                    "auto_refresh_interval": user.auto_refresh_interval
                },
                "system_info": {
                    "total_jobs_created": len(user.jobs) if hasattr(user, 'jobs') else 0,
                    "account_status": "active" if user.active else "inactive"
                }
            }
            
            # Jobs-Daten hinzufügen (falls verfügbar)
            if hasattr(user, 'jobs'):
                user_data["job_history"] = []
                for job in user.jobs:
                    job_info = {
                        "id": job.id,
                        "title": job.title,
                        "status": job.status,
                        "created_at": job.created_at.isoformat() if job.created_at else None,
                        "updated_at": job.updated_at.isoformat() if job.updated_at else None
                    }
                    user_data["job_history"].append(job_info)
            
            # JSON-Response mit Download-Headers erstellen
            response = make_response(jsonify(user_data))
            response.headers['Content-Type'] = 'application/json; charset=utf-8'
            response.headers['Content-Disposition'] = f'attachment; filename=user_data_export_{user.username}_{datetime.now().strftime("%Y%m%d_%H%M%S")}.json'
            
            user_logger.info(f"User {user.username} exported personal data (DSGVO)")
            return response
        
    except Exception as e:
        user_logger.error(f"Error exporting user data: {str(e)}")
        return jsonify({"error": "Fehler beim Exportieren der Benutzerdaten"}), 500

# ===== ADMINISTRATIVE BENUTZERVERWALTUNG (ursprünglich users.py) =====

@users_blueprint.route('/admin/users/<int:user_id>/permissions', methods=['GET'])
@users_admin_required
def user_permissions_page(user_id):
    """Admin-Seite für Benutzerberechtigungen"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            
            if not user:
                flash("Benutzer nicht gefunden", "error")
                return redirect(url_for('admin.users_overview'))
            
            # UserPermissions laden oder erstellen
            permissions = session.query(UserPermission).filter(UserPermission.user_id == user_id).first()
            if not permissions:
                permissions = UserPermission(user_id=user_id)
                session.add(permissions)
                session.commit()
        
        users_logger.info(f"Admin {current_user.username} accessed permissions for user {user.username}")
        return render_template('admin/user_permissions.html', user=user, permissions=permissions)
        
    except Exception as e:
        users_logger.error(f"Error loading user permissions page: {str(e)}")
        flash("Fehler beim Laden der Benutzerberechtigungen", "error")
        return redirect(url_for('admin.users_overview'))

@users_blueprint.route('/api/users/<int:user_id>/permissions', methods=['GET'])
@users_admin_required
def get_user_permissions_api(user_id):
    """API-Endpunkt für Benutzerberechtigungen"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            permissions = session.query(UserPermission).filter(UserPermission.user_id == user_id).first()
            if not permissions:
                permissions = UserPermission(user_id=user_id)
                session.add(permissions)
                session.commit()
            
            permissions_data = {
                "user_id": user_id,
                "username": user.username,
                "can_start_jobs": permissions.can_start_jobs,
                "needs_approval": permissions.needs_approval,
                "can_approve_jobs": permissions.can_approve_jobs
            }
        
        return jsonify(permissions_data)
        
    except Exception as e:
        users_logger.error(f"Error getting user permissions via API: {str(e)}")
        return jsonify({"error": "Fehler beim Abrufen der Benutzerberechtigungen"}), 500

@users_blueprint.route('/api/users/<int:user_id>/permissions', methods=['PUT'])
@users_admin_required
def update_user_permissions_api(user_id):
    """Benutzerberechtigungen via API aktualisieren"""
    try:
        data = request.get_json()
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            permissions = session.query(UserPermission).filter(UserPermission.user_id == user_id).first()
            if not permissions:
                permissions = UserPermission(user_id=user_id)
                session.add(permissions)
            
            # Berechtigungen aktualisieren
            if 'can_start_jobs' in data:
                permissions.can_start_jobs = data['can_start_jobs']
            if 'needs_approval' in data:
                permissions.needs_approval = data['needs_approval']
            if 'can_approve_jobs' in data:
                permissions.can_approve_jobs = data['can_approve_jobs']
            
            session.commit()
        
        users_logger.info(f"Admin {current_user.username} updated permissions for user {user.username}")
        return jsonify({
            "success": True,
            "message": "Berechtigungen erfolgreich aktualisiert"
        })
        
    except Exception as e:
        users_logger.error(f"Error updating user permissions via API: {str(e)}")
        return jsonify({"error": "Fehler beim Aktualisieren der Berechtigungen"}), 500

@users_blueprint.route('/admin/users/<int:user_id>/permissions/update', methods=['POST'])
@users_admin_required
def update_user_permissions_form(user_id):
    """Benutzerberechtigungen via Formular aktualisieren"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            if not user:
                flash("Benutzer nicht gefunden", "error")
                return redirect(url_for('admin.users_overview'))
            
            permissions = session.query(UserPermission).filter(UserPermission.user_id == user_id).first()
            if not permissions:
                permissions = UserPermission(user_id=user_id)
                session.add(permissions)
            
            # Formular-Daten verarbeiten
            permissions.can_start_jobs = 'can_start_jobs' in request.form
            permissions.needs_approval = 'needs_approval' in request.form
            permissions.can_approve_jobs = 'can_approve_jobs' in request.form
            
            session.commit()
        
        users_logger.info(f"Admin {current_user.username} updated permissions for user {user.username} via form")
        flash("Berechtigungen erfolgreich aktualisiert", "success")
        return redirect(url_for('users.user_permissions_page', user_id=user_id))
        
    except Exception as e:
        users_logger.error(f"Error updating user permissions via form: {str(e)}")
        flash("Fehler beim Aktualisieren der Berechtigungen", "error")
        return redirect(url_for('users.user_permissions_page', user_id=user_id))

@users_blueprint.route('/admin/users/<int:user_id>/edit/permissions', methods=['GET'])
@users_admin_required
def edit_user_permissions_section(user_id):
    """Berechtigungsbereich für Benutzer bearbeiten"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            permissions = session.query(UserPermission).filter(UserPermission.user_id == user_id).first()
            if not permissions:
                permissions = UserPermission(user_id=user_id)
        
        return render_template('admin/edit_user_permissions_section.html', user=user, permissions=permissions)
        
    except Exception as e:
        users_logger.error(f"Error loading user permissions edit section: {str(e)}")
        return jsonify({"error": "Fehler beim Laden der Berechtigungsbearbeitung"}), 500

@users_blueprint.route('/api/users/<int:user_id>', methods=['GET'])
@users_admin_required
def get_user_details_api(user_id):
    """API-Endpunkt für detaillierte Benutzerdaten"""
    try:
        with get_cached_session() as session:
            user = session.query(User).filter(User.id == user_id).first()
            
            if not user:
                return jsonify({"error": "Benutzer nicht gefunden"}), 404
            
            user_data = {
                "id": user.id,
                "username": user.username,
                "email": user.email,
                "name": user.name,
                "role": user.role,
                "active": user.active,
                "created_at": user.created_at.isoformat() if user.created_at else None,
                "last_login": user.last_login.isoformat() if user.last_login else None,
                "department": user.department,
                "position": user.position,
                "phone": user.phone,
                "bio": user.bio,
                "theme_preference": user.theme_preference,
                "language_preference": user.language_preference,
                "email_notifications": user.email_notifications,
                "browser_notifications": user.browser_notifications
            }
        
        return jsonify(user_data)
        
    except Exception as e:
        users_logger.error(f"Error getting user details via API: {str(e)}")
        return jsonify({"error": "Fehler beim Abrufen der Benutzerdaten"}), 500