// <copyright file="Target.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
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// </copyright>

using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;

namespace OpenQA.Selenium.DevTools;

/// <summary>
/// Class representing a target for DevTools Protocol commands
/// </summary>
public abstract class Target
{
    /// <summary>
    /// Occurs when a target is detached.
    /// </summary>
    public event EventHandler<TargetDetachedEventArgs>? TargetDetached;

    /// <summary>
    /// Occurs when a target is attached.
    /// </summary>
    public event EventHandler<TargetAttachedEventArgs>? TargetAttached;

    /// <summary>
    /// Asynchronously gets the targets available for this session.
    /// </summary>
    /// <returns>
    /// A task that represents the asynchronous operation. The task result
    /// contains the list of <see cref="TargetInfo"/> objects describing the
    /// targets available for this session.
    /// </returns>
    public abstract Task<ReadOnlyCollection<TargetInfo>> GetTargets(object? settings = null);

    /// <summary>
    /// Asynchronously attaches to a target.
    /// </summary>
    /// <param name="targetId">The ID of the target to which to attach.</param>
    /// <returns>
    /// A task representing the asynchronous attach operation. The task result contains the
    /// session ID established for commands to the target attached to.
    /// </returns>
    public abstract Task<string> AttachToTarget(string targetId);

    /// <summary>
    /// Asynchronously detaches from a target.
    /// </summary>
    /// <param name="sessionId">The ID of the session of the target from which to detach.</param>
    /// <param name="targetId">The ID of the target from which to detach.</param>
    /// <returns>
    /// A task representing the asynchronous detach operation.
    /// </returns>
    public abstract Task DetachFromTarget(string? sessionId = null, string? targetId = null);

    /// <summary>
    /// Asynchronously sets the DevTools Protocol connection to automatically attach to new targets.
    /// </summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    public abstract Task SetAutoAttach();

    internal abstract ICommand CreateSetAutoAttachCommand(bool waitForDebuggerOnStart);

    internal abstract ICommand CreateDiscoverTargetsCommand();

    /// <summary>
    /// Raises the TargetDetached event.
    /// </summary>
    /// <param name="e">An <see cref="TargetDetachedEventArgs"/> that contains the event data.</param>
    protected virtual void OnTargetDetached(TargetDetachedEventArgs e)
    {
        if (this.TargetDetached != null)
        {
            this.TargetDetached(this, e);
        }
    }

    /// <summary>
    /// Raises the TargetAttached event.
    /// </summary>
    /// <param name="e"></param>
    protected virtual void OnTargetAttached(TargetAttachedEventArgs e)
    {
        if (this.TargetAttached != null)
        {
            this.TargetAttached(this, e);
        }
    }
}