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

namespace Octokit.Reactive
{
    /// <summary>
    /// A client for GitHub's Collaborators on a Repository.
    /// </summary>
    /// <remarks>
    /// See the <a href="http://developer.github.com/v3/repos/collaborators/">Collaborators API documentation</a> for more details.
    /// </remarks>
    public class ObservableRepoCollaboratorsClient : IObservableRepoCollaboratorsClient
    {
        readonly IRepoCollaboratorsClient _client;
        readonly IConnection _connection;

        /// <summary>
        /// Initializes a new GitHub Repo Collaborators API client.
        /// </summary>
        /// <param name="client">An IGitHubClient client.</param>
        public ObservableRepoCollaboratorsClient(IGitHubClient client)
        {
            Ensure.ArgumentNotNull(client, "client");

            _client = client.Repository.Collaborator;
            _connection = client.Connection;
        }

        /// <summary>
        /// Gets all the collaborators on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<User> GetAll(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

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

        /// <summary>
        /// Gets all the collaborators on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="repositoryId">The id of the repository</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<User> GetAll(int repositoryId)
        {
            return GetAll(repositoryId, ApiOptions.None);
        }

        /// <summary>
        /// Gets all the collaborators on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </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>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<User> GetAll(string owner, string name, ApiOptions options)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(options, "options");
            
            return _connection.GetAndFlattenAllPages<User>(ApiUrls.RepoCollaborators(owner, name), options);
        }

        /// <summary>
        /// Gets all the collaborators on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="repositoryId">The id of the repository</param>
        /// <param name="options">Options for changing the API response</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<User> GetAll(int repositoryId, ApiOptions options)
        {
            Ensure.ArgumentNotNull(options, "options");

            return _connection.GetAndFlattenAllPages<User>(ApiUrls.RepoCollaborators(repositoryId), options);
        }

        /// <summary>
        /// Checks if a user is a collaborator on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="user">Username of the prospective collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<bool> IsCollaborator(string owner, string name, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

            return _client.IsCollaborator(owner, name, user).ToObservable();
        }

        /// <summary>
        /// Checks if a user is a collaborator on a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#get">API documentation</a> for more information.
        /// </remarks>
        /// <param name="repositoryId">The id of the repository</param>
        /// <param name="user">Username of the prospective collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<bool> IsCollaborator(int repositoryId, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

            return _client.IsCollaborator(repositoryId, user).ToObservable();
        }

        /// <summary>
        /// Adds a new collaborator to the repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="user">Username of the new collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<Unit> Add(string owner, string name, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

            return _client.Add(owner, name, user).ToObservable();
        }

        /// <summary>
        /// Adds a new collaborator to the repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#add-collaborator">API documentation</a> for more information.
        /// </remarks>
        /// <param name="repositoryId">The id of the repository</param>
        /// <param name="user">Username of the new collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<Unit> Add(int repositoryId, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

            return _client.Add(repositoryId, user).ToObservable();
        }

        /// <summary>
        /// Deletes a collaborator from the repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#list">API documentation</a> for more information.
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="user">Username of the deleted collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<Unit> Delete(string owner, string name, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

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

        /// <summary>
        /// Deletes a collaborator from the repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/#remove-collaborator">API documentation</a> for more information.
        /// </remarks>
        /// <param name="repositoryId">The id of the repository</param>
        /// <param name="user">Username of the deleted collaborator</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        public IObservable<Unit> Delete(int repositoryId, string user)
        {
            Ensure.ArgumentNotNullOrEmptyString(user, "user");

            return _client.Delete(repositoryId, user).ToObservable();
        }
    }
}