// <copyright file="Network.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.
// </copyright>

using System;
using System.Linq;
using System.Threading.Tasks;

namespace OpenQA.Selenium.DevTools;

/// <summary>
/// Class providing functionality for manipulating network calls using DevTools Protocol commands
/// </summary>
public abstract class Network
{
    /// <summary>
    /// Occurs when a network request requires authorization.
    /// </summary>
    public event AsyncEventHandler<AuthRequiredEventArgs>? AuthRequired;

    /// <summary>
    /// Occurs when a network request is intercepted.
    /// </summary>
    public event AsyncEventHandler<RequestPausedEventArgs>? RequestPaused;

    /// <summary>
    /// Occurs when a network response is received.
    /// </summary>
    public event AsyncEventHandler<ResponsePausedEventArgs>? ResponsePaused;

    /// <summary>
    /// Asynchronously disables network caching.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task DisableNetworkCaching();

    /// <summary>
    /// Asynchronously enables network caching.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task EnableNetworkCaching();

    /// <summary>
    /// Asynchronously enables the network domain.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task EnableNetwork();

    /// <summary>
    /// Asynchronously disables the fetch domain.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task DisableNetwork();

    /// <summary>
    /// Asynchronously enables the fetch domain for all URL patterns.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task EnableFetchForAllPatterns();

    /// <summary>
    /// Asynchronously sets the override of the user agent string.
    /// </summary>
    /// <param name="userAgent">The user agent string to set.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public async Task SetUserAgentOverride(string userAgent)
    {
        await SetUserAgentOverride(new UserAgent(userAgent)).ConfigureAwait(false);
    }

    /// <summary>
    /// Asynchronously sets the override of the user agent settings.
    /// </summary>
    /// <param name="userAgent">A <see cref="UserAgent"/> object containing the user agent values to override.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="userAgent"/> is null.</exception>
    public abstract Task SetUserAgentOverride(UserAgent userAgent);

    /// <summary>
    /// Asynchronously disables the fetch domain.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task DisableFetch();

    /// <summary>
    /// Asynchronously continues an intercepted network request.
    /// </summary>
    /// <param name="requestData">The <see cref="HttpRequestData"/> of the request.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="requestData"/> is <see langword="null"/>.</exception>
    public abstract Task ContinueRequest(HttpRequestData requestData);

    /// <summary>
    /// Asynchronously continues an intercepted network request and returns the specified response.
    /// </summary>
    /// <param name="requestData">The <see cref="HttpRequestData"/> of the request.</param>
    /// <param name="responseData">The <see cref="HttpResponseData"/> with which to respond to the request</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="requestData"/> or <paramref name="responseData"/> are <see langword="null"/>.</exception>
    public abstract Task ContinueRequestWithResponse(HttpRequestData requestData, HttpResponseData responseData);

    /// <summary>
    /// Asynchronously continues an intercepted network request without modification.
    /// </summary>
    /// <param name="requestData">The <see cref="HttpRequestData"/> of the network request.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="requestData"/> is <see langword="null"/>.</exception>
    public abstract Task ContinueRequestWithoutModification(HttpRequestData requestData);

    /// <summary>
    /// Asynchronously continues an intercepted network call using authentication.
    /// </summary>
    /// <param name="requestId">The ID of the network request for which to continue with authentication.</param>
    /// <param name="userName">The user name with which to authenticate.</param>
    /// <param name="password">The password with which to authenticate.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task ContinueWithAuth(string requestId, string? userName, string? password);

    /// <summary>
    /// Asynchronously cancels authorization of an intercepted network request.
    /// </summary>
    /// <param name="requestId">The ID of the network request for which to cancel authentication.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task CancelAuth(string requestId);

    /// <summary>
    /// Asynchronously adds the response body to the provided <see cref="HttpResponseData"/> object.
    /// </summary>
    /// <param name="responseData">The <see cref="HttpResponseData"/> object to which to add the response body.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="responseData"/> is <see langword="null"/>.</exception>
    public abstract Task AddResponseBody(HttpResponseData responseData);

    /// <summary>
    /// Asynchronously continues an intercepted network response without modification.
    /// </summary>
    /// <param name="responseData">The <see cref="HttpResponseData"/> of the network response.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="responseData"/> is <see langword="null"/>.</exception>
    public abstract Task ContinueResponseWithoutModification(HttpResponseData responseData);

    /// <summary>
    /// Raises the AuthRequired event.
    /// </summary>
    /// <param name="e">An <see cref="AuthRequiredEventArgs"/> that contains the event data.</param>
    protected virtual void OnAuthRequired(AuthRequiredEventArgs e)
    {
        var delegates = AuthRequired?.GetInvocationList();

        if (delegates != null)
        {
            foreach (var d in delegates.Cast<AsyncEventHandler<AuthRequiredEventArgs>>())
            {
                Task.Run(async () => await d.Invoke(this, e)).GetAwaiter().GetResult();
            }
        }
    }

    /// <summary>
    /// Raises the RequestPaused event.
    /// </summary>
    /// <param name="e">An <see cref="RequestPausedEventArgs"/> that contains the event data.</param>
    protected virtual void OnRequestPaused(RequestPausedEventArgs e)
    {
        var delegates = RequestPaused?.GetInvocationList();

        if (delegates != null)
        {
            foreach (var d in delegates.Cast<AsyncEventHandler<RequestPausedEventArgs>>())
            {
                Task.Run(async () => await d.Invoke(this, e)).GetAwaiter().GetResult();
            }
        }
    }

    /// <summary>
    /// Raises the ResponseReceived event.
    /// </summary>
    /// <param name="e">An <see cref="ResponsePausedEventArgs"/> that contains the event data.</param>
    protected virtual void OnResponsePaused(ResponsePausedEventArgs e)
    {
        var delegates = ResponsePaused?.GetInvocationList();

        if (delegates != null)
        {
            foreach (var d in delegates.Cast<AsyncEventHandler<ResponsePausedEventArgs>>())
            {
                Task.Run(async () => await d.Invoke(this, e)).GetAwaiter().GetResult();
            }
        }
    }

    /// <returns>A task that represents the asynchronous operation.</returns>
    /// <summary>
    /// Am asynchronous delegate for handling network events.
    /// </summary>
    /// <typeparam name="TEventArgs">The type of event args the event raises.</typeparam>
    /// <param name="sender">The sender of the event.</param>
    /// <param name="e">An object containing information about the event.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public delegate Task AsyncEventHandler<TEventArgs>(object sender, TEventArgs e);
}
