//
// Copyright 2023 Google LLC
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
//

using NUnit.Framework;
using System;

namespace Google.Solutions.Ssh.Test
{
    internal class KeyboardInteractiveHandler : IKeyboardInteractiveHandler
    {
        public delegate string? PromptDelegate(
            string name,
            string instruction,
            string prompt,
            bool echo);

        public delegate IPasswordCredential PromptForCredentialsDelegate(
            string username);

        public uint PromptCount { get; private set; } = 0;

        public PromptDelegate PromptCallback { get; set; } = (n, i, p, e) =>
        {
            Assert.Fail("Unexpected prompt");
            throw new InvalidOperationException("Unexpected prompt");
        };

        public PromptForCredentialsDelegate PromptForCredentialsCallback { get; set; } = c =>
        {
            throw new InvalidOperationException("Unexpected prompt");
        };

        public string? Prompt(
            string name,
            string instruction,
            string prompt,
            bool echo)
        {
            this.PromptCount++;
            return this.PromptCallback(name, instruction, prompt, echo);
        }

        public IPasswordCredential PromptForCredentials(string username)
        {
            this.PromptCount++;
            return this.PromptForCredentialsCallback(username);
        }
    }
}
