from functools import wraps
from flask import jsonify, request, current_app
from flask_jwt_extended import get_jwt_identity, verify_jwt_in_request
from app.models import User, Permission
from .extensions import db

class Authorization:
    @staticmethod
    def check_permission(required_permission):
        def decorator(f):
            @wraps(f)
            def decorated_function(*args, **kwargs):
                from .models import User  # 在函数内部导入以避免循环导入
                current_user_id = get_jwt_identity()
                user = User.query.get(current_user_id)
                if not user:
                    return jsonify({"message": "User not found"}), 404
                
                user_permissions = user.get_all_permissions()
                if required_permission not in user_permissions:
                    return jsonify({"message": "Permission denied"}), 403
                return f(*args, **kwargs)
            return decorated_function
        return decorator

    @staticmethod
    def check_role(required_role):
        def decorator(f):
            @wraps(f)
            def decorated_function(*args, **kwargs):
                current_user_id = get_jwt_identity()
                user = User.query.get(current_user_id)
                if not user:
                    return jsonify({"message": "User not found"}), 404
                
                user_roles = [role.name for role in user.roles]
                if required_role not in user_roles:
                    return jsonify({"message": "Role not authorized"}), 403
                return f(*args, **kwargs)
            return decorated_function
        return decorator

    @staticmethod
    def check_department(required_department):
        def decorator(f):
            @wraps(f)
            def decorated_function(*args, **kwargs):
                current_user_id = get_jwt_identity()
                user = User.query.get(current_user_id)
                if not user:
                    return jsonify({"message": "User not found"}), 404
                
                user_departments = [user.primary_department.name] + [dept.name for dept in user.secondary_departments]
                if required_department not in user_departments:
                    return jsonify({"message": "Department not authorized"}), 403
                return f(*args, **kwargs)
            return decorated_function
        return decorator

    @staticmethod
    def api_permission_required(permission):
        def decorator(f):
            @wraps(f)
            def decorated_function(*args, **kwargs):
                verify_jwt_in_request()
                current_user_id = get_jwt_identity()
                user = User.query.get(current_user_id)
                if not user:
                    return jsonify({"message": "User not found"}), 404
                
                user_permissions = user.get_all_permissions()
                if permission not in user_permissions:
                    return jsonify({"message": "Permission denied"}), 403
                return f(*args, **kwargs)
            return decorated_function
        return decorator

def init_permissions():
    from .models import Permission  # 在函数内部导入以避免循环导入
    # 这个函数可以在应用启动时调用，用于初始化或更新权限
    # 可以从配置文件、数据库或其他来源读取权限定义
    permissions = [
        "create_user", "edit_user", "delete_user",
        "create_role", "edit_role", "delete_role",
        "create_department", "edit_department", "delete_department",
        # ... 其他权限 ...
    ]
    for perm_name in permissions:
        perm = Permission.query.filter_by(name=perm_name).first()
        if not perm:
            new_perm = Permission(name=perm_name)
            db.session.add(new_perm)
    db.session.commit()

# 可以添加更多的辅助函数，比如检查复杂的权限组合等