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

namespace Octokit.Reactive
{
    /// <summary>
    /// A client for GitHub's References API.
    /// </summary>
    /// <remarks>
    /// See the <a href="http://developer.github.com/v3/git/refs/">References API documentation</a> for more information.
    /// </remarks>
    public class ObservableReferencesClient : IObservableReferencesClient
    {
        readonly IReferencesClient _reference;
        readonly IConnection _connection;

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

            _reference = client.Git.Reference;
            _connection = client.Connection;
        }

        /// <summary>
        /// Gets a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-a-reference
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <returns></returns>
        public IObservable<Reference> Get(string owner, string name, string reference)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");

            return _reference.Get(owner, name, reference).ToObservable();
        }

        /// <summary>
        /// Gets a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-a-reference
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <returns></returns>
        public IObservable<Reference> Get(int repositoryId, string reference)
        {
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");

            return _reference.Get(repositoryId, reference).ToObservable();
        }

        /// <summary>
        /// Gets all references for a given repository
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-all-references
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <returns></returns>
        public IObservable<Reference> GetAll(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return _connection.GetAndFlattenAllPages<Reference>(ApiUrls.Reference(owner, name));
        }

        /// <summary>
        /// Gets all references for a given repository
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-all-references
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <returns></returns>
        public IObservable<Reference> GetAll(int repositoryId)
        {
            return _connection.GetAndFlattenAllPages<Reference>(ApiUrls.Reference(repositoryId));
        }

        /// <summary>
        /// Gets references for a given repository by sub-namespace, i.e. "tags" or "heads"
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-all-references
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="subNamespace">The sub-namespace to get references for</param>
        /// <returns></returns>
        public IObservable<Reference> GetAllForSubNamespace(string owner, string name, string subNamespace)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(subNamespace, "subNamespace");

            return _connection.GetAndFlattenAllPages<Reference>(ApiUrls.Reference(owner, name, subNamespace));
        }

        /// <summary>
        /// Gets references for a given repository by sub-namespace, i.e. "tags" or "heads"
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#get-all-references
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="subNamespace">The sub-namespace to get references for</param>
        /// <returns></returns>
        public IObservable<Reference> GetAllForSubNamespace(int repositoryId, string subNamespace)
        {
            Ensure.ArgumentNotNullOrEmptyString(subNamespace, "subNamespace");

            return _connection.GetAndFlattenAllPages<Reference>(ApiUrls.Reference(repositoryId, subNamespace));
        }

        /// <summary>
        /// Creates a reference for a given repository
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#create-a-reference
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="reference">The reference to create</param>
        /// <returns></returns>
        public IObservable<Reference> Create(string owner, string name, NewReference reference)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(reference, "reference");

            return _reference.Create(owner, name, reference).ToObservable();
        }

        /// <summary>
        /// Creates a reference for a given repository
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#create-a-reference
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="reference">The reference to create</param>
        /// <returns></returns>
        public IObservable<Reference> Create(int repositoryId, NewReference reference)
        {
            Ensure.ArgumentNotNull(reference, "reference");

            return _reference.Create(repositoryId, reference).ToObservable();
        }

        /// <summary>
        /// Updates a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#update-a-reference
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <param name="referenceUpdate">The updated reference data</param>
        /// <returns></returns>
        public IObservable<Reference> Update(string owner, string name, string reference, ReferenceUpdate referenceUpdate)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
            Ensure.ArgumentNotNull(referenceUpdate, "update");

            return _reference.Update(owner, name, reference, referenceUpdate).ToObservable();
        }

        /// <summary>
        /// Updates a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#update-a-reference
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <param name="referenceUpdate">The updated reference data</param>
        /// <returns></returns>
        public IObservable<Reference> Update(int repositoryId, string reference, ReferenceUpdate referenceUpdate)
        {
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
            Ensure.ArgumentNotNull(referenceUpdate, "update");

            return _reference.Update(repositoryId, reference, referenceUpdate).ToObservable();
        }

        /// <summary>
        /// Deletes a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#delete-a-reference
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <returns></returns>
        public IObservable<Unit> Delete(string owner, string name, string reference)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");

            return _reference.Delete(owner, name, reference).ToObservable();
        }

        /// <summary>
        /// Deletes a reference for a given repository by reference name
        /// </summary>
        /// <remarks>
        /// http://developer.github.com/v3/git/refs/#delete-a-reference
        /// </remarks>
        /// <param name="repositoryId">The ID of the repository</param>
        /// <param name="reference">The name of the reference</param>
        /// <returns></returns>
        public IObservable<Unit> Delete(int repositoryId, string reference)
        {
            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");

            return _reference.Delete(repositoryId, reference).ToObservable();
        }
    }
}