using System;
#if NET_45
using System.Collections.Generic;
#endif
using System.Threading.Tasks;
using System.Linq;
using System.Collections.ObjectModel;

namespace Octokit
{
    /// <summary>
    /// A client for GitHub's Repositories API.
    /// </summary>
    /// <remarks>
    /// See the <a href="http://developer.github.com/v3/repos/">Repositories API documentation</a> for more details.
    /// </remarks>
    public class RepositoriesClient : ApiClient, IRepositoriesClient
    {
        /// <summary>
        /// Initializes a new GitHub Repos API client.
        /// </summary>
        /// <param name="apiConnection">An API connection</param>
        public RepositoriesClient(IApiConnection apiConnection) : base(apiConnection)
        {
            CommitStatus = new CommitStatusClient(apiConnection);
            RepoCollaborators = new RepoCollaboratorsClient(apiConnection);
            Statistics = new StatisticsClient(apiConnection);
            Deployment = new DeploymentsClient(apiConnection);
            PullRequest = new PullRequestsClient(apiConnection);
            RepositoryComments = new RepositoryCommentsClient(apiConnection);
            Commits = new RepositoryCommitsClient(apiConnection);
        }

        /// <summary>
        /// Creates a new repository for the current user.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#create">API documentation</a> for more information.
        /// </remarks>
        /// <param name="newRepository">A <see cref="NewRepository"/> instance describing the new repository to create</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        /// <returns>A <see cref="Repository"/> instance for the created repository.</returns>
        public Task<Repository> Create(NewRepository newRepository)
        {
            Ensure.ArgumentNotNull(newRepository, "newRepository");
            if (string.IsNullOrEmpty(newRepository.Name))
                throw new ArgumentException("The new repository's name must not be null.");

            return Create(ApiUrls.Repositories(), null, newRepository);
        }

        /// <summary>
        /// Creates a new repository in the specified organization.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#create">API documentation</a> for more information.
        /// </remarks>
        /// <param name="organizationLogin">Login of the organization in which to create the repostiory</param>
        /// <param name="newRepository">A <see cref="NewRepository"/> instance describing the new repository to create</param>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        /// <returns>A <see cref="Repository"/> instance for the created repository</returns>
        public Task<Repository> Create(string organizationLogin, NewRepository newRepository)
        {
            Ensure.ArgumentNotNull(organizationLogin, "organizationLogin");
            Ensure.ArgumentNotNull(newRepository, "newRepository");
            if (string.IsNullOrEmpty(newRepository.Name))
                throw new ArgumentException("The new repository's name must not be null.");

            return Create(ApiUrls.OrganizationRepositories(organizationLogin), organizationLogin, newRepository);
        }

        async Task<Repository> Create(Uri url, string organizationLogin, NewRepository newRepository)
        {
            try
            {
                return await ApiConnection.Post<Repository>(url, newRepository);
            }
            catch (ApiValidationException e)
            {
                string errorMessage = e.ApiError.FirstErrorMessageSafe();
                
                if (String.Equals(
                    "name already exists on this account",
                    errorMessage,
                    StringComparison.OrdinalIgnoreCase))
                {
                    string owner = organizationLogin ?? Connection.Credentials.Login;

                    var baseAddress = Connection.BaseAddress.Host != GitHubClient.GitHubApiUrl.Host
                        ? Connection.BaseAddress
                        : new Uri("https://github.com/");
                    throw new RepositoryExistsException(
                        owner,
                        newRepository.Name,
                        organizationLogin != null,
                        baseAddress, e);
                }
                if (String.Equals(
                    "name can't be private. You are over your quota.",
                    errorMessage,
                    StringComparison.OrdinalIgnoreCase))
                {
                    throw new PrivateRepositoryQuotaExceededException(e);
                }
                throw;
            }
        }

        /// <summary>
        /// Deletes the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#delete-a-repository">API documentation</a> for more information.
        /// Deleting a repository requires admin access. If OAuth is used, the `delete_repo` scope is required.
        /// </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 Task Delete(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var endpoint = "repos/{0}/{1}".FormatUri(owner, name);
            return ApiConnection.Delete(endpoint);
        }

        /// <summary>
        /// Updates the specified repository with the values given in <paramref name="update"/>
        /// </summary>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="update">New values to update the repository with</param>
        /// <returns>The updated <see cref="T:Octokit.Repository"/></returns>
        public Task<Repository> Edit(string owner, string name, RepositoryUpdate update)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");
            Ensure.ArgumentNotNull(update, "update");

            return ApiConnection.Patch<Repository>(ApiUrls.Repository(owner, name), update);
        }

        /// <summary>
        /// Gets the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#get">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>
        /// <returns>A <see cref="Repository"/></returns>
        public Task<Repository> Get(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var endpoint = "repos/{0}/{1}".FormatUri(owner, name);
            return ApiConnection.Get<Repository>(endpoint);
        }

        /// <summary>
        /// Gets all repositories owned by the current user.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-your-repositories">API documentation</a> for more information.
        /// The default page size on GitHub.com is 30.
        /// </remarks>
        /// <exception cref="AuthorizationException">Thrown if the client is not authenticated.</exception>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        /// <returns>A <see cref="IReadOnlyPagedCollection{Repository}"/> of <see cref="Repository"/>.</returns>
        public Task<IReadOnlyList<Repository>> GetAllForCurrent()
        {
            return ApiConnection.GetAll<Repository>(ApiUrls.Repositories());
        }

        /// <summary>
        /// Gets all repositories owned by the specified user.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-user-repositories">API documentation</a> for more information.
        /// The default page size on GitHub.com is 30.
        /// </remarks>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        /// <returns>A <see cref="IReadOnlyPagedCollection{Repository}"/> of <see cref="Repository"/>.</returns>
        public Task<IReadOnlyList<Repository>> GetAllForUser(string login)
        {
            Ensure.ArgumentNotNullOrEmptyString(login, "login");

            return ApiConnection.GetAll<Repository>(ApiUrls.Repositories(login));
        }

        /// <summary>
        /// Gets all repositories owned by the specified organization.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-organization-repositories">API documentation</a> for more information.
        /// The default page size on GitHub.com is 30.
        /// </remarks>
        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
        /// <returns>A <see cref="IReadOnlyPagedCollection{Repository}"/> of <see cref="Repository"/>.</returns>
        public Task<IReadOnlyList<Repository>> GetAllForOrg(string organization)
        {
            Ensure.ArgumentNotNullOrEmptyString(organization, "organization");

            return ApiConnection.GetAll<Repository>(ApiUrls.OrganizationRepositories(organization));
        }

        /// <summary>
        /// Gets the preferred README for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/contents/#get-the-readme">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>
        /// <returns></returns>
        public async Task<Readme> GetReadme(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var endpoint = "repos/{0}/{1}/readme".FormatUri(owner, name);
            var readmeInfo = await ApiConnection.Get<ReadmeResponse>(endpoint, null).ConfigureAwait(false);
            return new Readme(readmeInfo, ApiConnection);
        }

        /// <summary>
        /// Gets the perferred README's HTML for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/contents/#get-the-readme">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>
        /// <returns></returns>
        public Task<string> GetReadmeHtml(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var endpoint = "repos/{0}/{1}/readme".FormatUri(owner, name);
            return ApiConnection.GetHtml(endpoint, null);
        }

        /// <summary>
        /// A client for GitHub's Commit Status API.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/statuses/">Commit Status API documentation</a> for more
        /// details. Also check out the <a href="https://github.com/blog/1227-commit-status-api">blog post</a> 
        /// that announced this feature.
        /// </remarks>
        public ICommitStatusClient CommitStatus { get; private set; }

        /// <summary>
        /// A client for GitHub's Repo Collaborators.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/collaborators/">Collaborators API documentation</a> for more details
        /// </remarks>
        public IRepoCollaboratorsClient RepoCollaborators { get; private set; }

        /// <summary>
        /// Client for GitHub's Repository Deployments API
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/deployment/">Collaborators API documentation</a> for more details
        /// </remarks>
        public IDeploymentsClient Deployment { get; private set; }

        /// <summary>
        /// Client for GitHub's Repository Statistics API
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/statistics/">Statistics API documentation</a> for more details
        ///</remarks>
        public IStatisticsClient Statistics { get; private set; }

        /// <summary>
        /// Client for GitHub's Repository Commits API
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/commits/">Commits API documentation</a> for more details
        ///</remarks>
        public IRepositoryCommitsClient Commits { get; private set; }

        /// <summary>
        /// Client for managing pull requests.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/pulls/">Pull Requests API documentation</a> for more details
        /// </remarks>
        public IPullRequestsClient PullRequest { get; private set; }

        /// <summary>
        /// Client for managing commit comments in a repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/comments/">Repository Comments API documentation</a> for more information.
        /// </remarks>
        public IRepositoryCommentsClient RepositoryComments { get; private set; }

        /// <summary>
        /// Gets all the branches for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-branches">API documentation</a> for more details
        /// </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>
        /// <returns>All <see cref="T:Octokit.Branch"/>es of the repository</returns>
        public Task<IReadOnlyList<Branch>> GetAllBranches(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var endpoint = ApiUrls.RepoBranches(owner, name);
            return ApiConnection.GetAll<Branch>(endpoint);
        }


        /// <summary>
        /// Gets all contributors for the specified repository. Does not include anonymous contributors.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-contributors">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <returns>All contributors of the repository.</returns>
        public Task<IReadOnlyList<User>> GetAllContributors(string owner, string name)
        {
            return GetAllContributors(owner, name, false);
        }

        /// <summary>
        /// Gets all contributors for the specified repository. With the option to include anonymous contributors.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-contributors">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <param name="includeAnonymous">True if anonymous contributors should be included in result; Otherwise false</param>
        /// <returns>All contributors of the repository.</returns>
        public Task<IReadOnlyList<User>> GetAllContributors(string owner, string name, bool includeAnonymous)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            var parameters = new Dictionary<string, string>();
            if (includeAnonymous)
                parameters.Add("anon", "1");

            return ApiConnection.GetAll<User>(ApiUrls.RepositoryContributors(owner, name), parameters);
        }

        /// <summary>
        /// Gets all languages for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-languages">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <returns>All languages used in the repository and the number of bytes of each language.</returns>
        public Task<IReadOnlyList<RepositoryLanguage>> GetAllLanguages(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return ApiConnection
                .Get<IDictionary<string, long>>(ApiUrls.RepositoryLanguages(owner, name))
                .ContinueWith<IReadOnlyList<RepositoryLanguage>>(t => 
                    new ReadOnlyCollection<RepositoryLanguage>(
                        t.Result.Select(kvp => new RepositoryLanguage(kvp.Key, kvp.Value)).ToList()
                    ),
                    TaskContinuationOptions.OnlyOnRanToCompletion);
        }

        /// <summary>
        /// Gets all teams for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-teams">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <returns>All <see cref="T:Octokit.Team"/>s associated with the repository</returns>
        public Task<IReadOnlyList<Team>> GetAllTeams(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return ApiConnection.GetAll<Team>(ApiUrls.RepositoryTeams(owner, name));
        }

        /// <summary>
        /// Gets all tags for the specified repository.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#list-tags">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="name">The name of the repository</param>
        /// <returns>All of the repositorys tags.</returns>
        public Task<IReadOnlyList<RepositoryTag>> GetAllTags(string owner, string name)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(name, "name");

            return ApiConnection.GetAll<RepositoryTag>(ApiUrls.RepositoryTags(owner, name));
        }

        /// <summary>
        /// Gets the specified branch.
        /// </summary>
        /// <remarks>
        /// See the <a href="http://developer.github.com/v3/repos/#get-branch">API documentation</a> for more details
        /// </remarks>
        /// <param name="owner">The owner of the repository</param>
        /// <param name="repositoryName">The name of the repository</param>
        /// <param name="branchName">The name of the branch</param>
        /// <returns>The specified <see cref="T:Octokit.Branch"/></returns>
        public Task<Branch> GetBranch(string owner, string repositoryName, string branchName)
        {
            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
            Ensure.ArgumentNotNullOrEmptyString(repositoryName, "repositoryName");
            Ensure.ArgumentNotNullOrEmptyString(branchName, "branchName");

            return ApiConnection.Get<Branch>(ApiUrls.RepoBranch(owner, repositoryName, branchName));
        }
    }
}