using System;
using System.Reactive;
using System.Reactive.Threading.Tasks;
using Octokit.Reactive.Internal;

namespace Octokit.Reactive
{
    /// <summary>
    /// A client for GitHub's Issue Comments API.
    /// </summary>
    /// <remarks>
    /// See the <a href="http://developer.github.com/v3/issues/comments/">Issue Comments API documentation</a> for more information.
    /// </remarks>
    public class ObservableIssueCommentsClient : IObservableIssueCommentsClient
    {
        readonly IIssueCommentsClient _client;
        readonly IConnection _connection;

        public ObservableIssueCommentsClient(IGitHubClient client)
        {
            Ensure.ArgumentNotNull(client, "client");

            _client = client.Issue.Comment;
            _connection = client.Connection;
        }

        /// <summary>
        /// Gets a single Issue Comment by id.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#get-a-single-comment</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="id">The issue comment id</param>
        public IObservable<IssueComment> Get(string owner, string name, int id)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return _client.Get(owner, name, id).ToObservable();
        }

        /// <summary>
        /// Gets a single Issue Comment by id.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#get-a-single-comment</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="id">The issue comment id</param>
        public IObservable<IssueComment> Get(int repositoryId, int id)
        {
            return _client.Get(repositoryId, id).ToObservable();
        }

        /// <summary>
        /// Gets Issue Comments for a repository.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-in-a-repository</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        public IObservable<IssueComment> GetAllForRepository(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return GetAllForRepository(owner, name, ApiOptions.None);
        }

        /// <summary>
        /// Gets Issue Comments for a repository.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-in-a-repository</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        public IObservable<IssueComment> GetAllForRepository(int repositoryId)
        {
            return GetAllForRepository(repositoryId, ApiOptions.None);
        }

        /// <summary>
        /// Gets Issue Comments for a repository.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-in-a-repository</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="options">Options for changing the API response</param>
        public IObservable<IssueComment> GetAllForRepository(string owner, string name, ApiOptions options)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(options, "options");

            return _connection.GetAndFlattenAllPages<IssueComment>(ApiUrls.IssueComments(owner, name), null, AcceptHeaders.ReactionsPreview, options);
        }

        /// <summary>
        /// Gets Issue Comments for a repository.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-in-a-repository</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="options">Options for changing the API response</param>
        public IObservable<IssueComment> GetAllForRepository(int repositoryId, ApiOptions options)
        {
            Ensure.ArgumentNotNull(options, "options");

            return _connection.GetAndFlattenAllPages<IssueComment>(ApiUrls.IssueComments(repositoryId), options);
        }

        /// <summary>
        /// Gets Issue Comments for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-on-an-issue</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="number">The issue number</param>
        public IObservable<IssueComment> GetAllForIssue(string owner, string name, int number)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return GetAllForIssue(owner, name, number, ApiOptions.None);
        }

        /// <summary>
        /// Gets Issue Comments for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-on-an-issue</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="number">The issue number</param>
        public IObservable<IssueComment> GetAllForIssue(int repositoryId, int number)
        {
            return GetAllForIssue(repositoryId, number, ApiOptions.None);
        }

        /// <summary>
        /// Gets Issue Comments for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-on-an-issue</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="number">The issue number</param>
        /// <param name="options">Options for changing the API response</param>
        public IObservable<IssueComment> GetAllForIssue(string owner, string name, int number, ApiOptions options)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(options, "options");

            return _connection.GetAndFlattenAllPages<IssueComment>(ApiUrls.IssueComments(owner, name, number), null, AcceptHeaders.ReactionsPreview, options);
        }

        /// <summary>
        /// Gets Issue Comments for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#list-comments-on-an-issue</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="number">The issue number</param>
        /// <param name="options">Options for changing the API response</param>
        public IObservable<IssueComment> GetAllForIssue(int repositoryId, int number, ApiOptions options)
        {
            Ensure.ArgumentNotNull(options, "options");

            return _connection.GetAndFlattenAllPages<IssueComment>(ApiUrls.IssueComments(repositoryId, number), options);
        }

        /// <summary>
        /// Creates a new Issue Comment for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#create-a-comment</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="number">The number of the issue</param>
        /// <param name="newComment">The text of the new comment</param>
        public IObservable<IssueComment> Create(string owner, string name, int number, string newComment)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(newComment, "newComment");

            return _client.Create(owner, name, number, newComment).ToObservable();
        }

        /// <summary>
        /// Creates a new Issue Comment for a specified Issue.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#create-a-comment</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="number">The number of the issue</param>
        /// <param name="newComment">The text of the new comment</param>
        public IObservable<IssueComment> Create(int repositoryId, int number, string newComment)
        {
            Ensure.ArgumentNotNull(newComment, "newComment");

            return _client.Create(repositoryId, number, newComment).ToObservable();
        }

        /// <summary>
        /// Updates a specified Issue Comment.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#edit-a-comment</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="id">The comment id</param>
        /// <param name="commentUpdate">The modified comment</param>
        public IObservable<IssueComment> Update(string owner, string name, int id, string commentUpdate)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(commentUpdate, "commentUpdate");

            return _client.Update(owner, name, id, commentUpdate).ToObservable();
        }

        /// <summary>
        /// Updates a specified Issue Comment.
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#edit-a-comment</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="id">The comment id</param>
        /// <param name="commentUpdate">The modified comment</param>
        public IObservable<IssueComment> Update(int repositoryId, int id, string commentUpdate)
        {
            Ensure.ArgumentNotNull(commentUpdate, "commentUpdate");

            return _client.Update(repositoryId, id, commentUpdate).ToObservable();
        }

        /// <summary>
        /// Deletes the specified Issue Comment
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#delete-a-comment</remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="id">The comment id</param>
        public IObservable<Unit> Delete(string owner, string name, int id)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return _client.Delete(owner, name, id).ToObservable();
        }

        /// <summary>
        /// Deletes the specified Issue Comment
        /// </summary>
        /// <remarks>http://developer.github.com/v3/issues/comments/#delete-a-comment</remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="id">The comment id</param>
        public IObservable<Unit> Delete(int repositoryId, int id)
        {
            return _client.Delete(repositoryId, id).ToObservable();
        }
    }
}