using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using SpotifyAPI.Web.Enums;
using SpotifyAPI.Web.Models;

namespace SpotifyAPI.Web
{
    public sealed class SpotifyWebAPI : IDisposable
    {
        public const String APIBase = "https://api.spotify.com/v1";

        public SpotifyWebAPI()
        {
            UseAuth = true;
            WebClient = new SpotifyWebClient
            {
                JsonSettings =
                    new JsonSerializerSettings
                    {
                        NullValueHandling = NullValueHandling.Ignore,
                        TypeNameHandling = TypeNameHandling.All
                    }
            };
        }

        public String TokenType { get; set; }
        public String AccessToken { get; set; }
        public Boolean UseAuth { get; set; }
        public IClient WebClient { get; set; }

        public void Dispose()
        {
            WebClient.Dispose();
            GC.SuppressFinalize(this);
        }

        #region Search

        /// <summary>
        ///     Get Spotify catalog information about artists, albums, tracks or playlists that match a keyword string.
        /// </summary>
        /// <param name="q">The search query's keywords (and optional field filters and operators), for example q=roadhouse+blues.</param>
        /// <param name="type">A list of item types to search across.</param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first result to return. Default: 0</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code or the string from_token.</param>
        /// <returns></returns>
        public SearchItem SearchItems(String q, SearchType type, int limit = 20, int offset = 0, String market = "")
        {
            limit = Math.Min(50, limit);
            StringBuilder builder = new StringBuilder(APIBase + "/search");
            builder.Append("?q=" + q);
            builder.Append("&type=" + type.GetStringAttribute(","));
            builder.Append("&limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<SearchItem>(builder.ToString());
        }

        #endregion

        #region Albums

        /// <summary>
        ///     Get Spotify catalog information about an album’s tracks. Optional parameters can be used to limit the number of
        ///     tracks returned.
        /// </summary>
        /// <param name="id">The Spotify ID for the album.</param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first track to return. Default: 0 (the first object).</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        public Paging<SimpleTrack> GetAlbumTracks(String id, int limit = 20, int offset = 0, String market = "")
        {
            limit = Math.Min(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/albums/" + id + "/tracks");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<Paging<SimpleTrack>>(builder.ToString());
        }

        /// <summary>
        ///     Get Spotify catalog information for a single album.
        /// </summary>
        /// <param name="id">The Spotify ID for the album.</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        public FullAlbum GetAlbum(String id, String market = "")
        {
            if (String.IsNullOrEmpty(market))
                return DownloadData<FullAlbum>(APIBase + "/albums/" + id);
            return DownloadData<FullAlbum>(APIBase + "/albums/" + id + "?market=" + market);
        }

        /// <summary>
        ///     Get Spotify catalog information for multiple albums identified by their Spotify IDs.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs for the albums. Maximum: 20 IDs.</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        public SeveralAlbums GetSeveralAlbums(List<String> ids, String market = "")
        {
            if (String.IsNullOrEmpty(market))
                return DownloadData<SeveralAlbums>(APIBase + "/albums?ids=" + string.Join(",", ids.Take(20)));
            return DownloadData<SeveralAlbums>(APIBase + "/albums?market=" + market + "&ids=" + string.Join(",", ids.Take(20)));
        }

        #endregion

        #region Artists

        /// <summary>
        ///     Get Spotify catalog information for a single artist identified by their unique Spotify ID.
        /// </summary>
        /// <param name="id">The Spotify ID for the artist.</param>
        /// <returns></returns>
        public FullArtist GetArtist(String id)
        {
            return DownloadData<FullArtist>(APIBase + "/artists/" + id);
        }

        /// <summary>
        ///     Get Spotify catalog information about artists similar to a given artist. Similarity is based on analysis of the
        ///     Spotify community’s listening history.
        /// </summary>
        /// <param name="id">The Spotify ID for the artist.</param>
        /// <returns></returns>
        public SeveralArtists GetRelatedArtists(String id)
        {
            return DownloadData<SeveralArtists>(APIBase + "/artists/" + id + "/related-artists");
        }

        /// <summary>
        ///     Get Spotify catalog information about an artist’s top tracks by country.
        /// </summary>
        /// <param name="id">The Spotify ID for the artist.</param>
        /// <param name="country">The country: an ISO 3166-1 alpha-2 country code.</param>
        /// <returns></returns>
        public SeveralTracks GetArtistsTopTracks(String id, String country)
        {
            return DownloadData<SeveralTracks>(APIBase + "/artists/" + id + "/top-tracks?country=" + country);
        }

        /// <summary>
        ///     Get Spotify catalog information about an artist’s albums. Optional parameters can be specified in the query string
        ///     to filter and sort the response.
        /// </summary>
        /// <param name="id">The Spotify ID for the artist.</param>
        /// <param name="type">
        ///     A list of keywords that will be used to filter the response. If not supplied, all album types will
        ///     be returned
        /// </param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first album to return. Default: 0</param>
        /// <param name="market">
        ///     An ISO 3166-1 alpha-2 country code. Supply this parameter to limit the response to one particular
        ///     geographical market
        /// </param>
        /// <returns></returns>
        public Paging<SimpleAlbum> GetArtistsAlbums(String id, AlbumType type = AlbumType.All, int limit = 20, int offset = 0, String market = "")
        {
            limit = Math.Min(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/artists/" + id + "/albums");
            builder.Append("?type=" + type.GetStringAttribute(","));
            builder.Append("&limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<Paging<SimpleAlbum>>(builder.ToString());
        }

        /// <summary>
        ///     Get Spotify catalog information for several artists based on their Spotify IDs.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs for the artists. Maximum: 50 IDs.</param>
        /// <returns></returns>
        public SeveralArtists GetSeveralArtists(List<String> ids)
        {
            return DownloadData<SeveralArtists>(APIBase + "/artists?ids=" + string.Join(",", ids.Take(50)));
        }

        #endregion

        #region Browse

        /// <summary>
        ///     Get a list of Spotify featured playlists (shown, for example, on a Spotify player’s “Browse” tab).
        /// </summary>
        /// <param name="locale">
        ///     The desired language, consisting of a lowercase ISO 639 language code and an uppercase ISO 3166-1
        ///     alpha-2 country code, joined by an underscore.
        /// </param>
        /// <param name="country">A country: an ISO 3166-1 alpha-2 country code.</param>
        /// <param name="timestamp">A timestamp in ISO 8601 format</param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first item to return. Default: 0</param>
        /// <remarks>AUTH NEEDED</remarks>
        public FeaturedPlaylists GetFeaturedPlaylists(String locale = "", String country = "", DateTime timestamp = default(DateTime), int limit = 20, int offset = 0)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetFeaturedPlaylists");
            limit = Math.Max(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/browse/featured-playlists");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(locale))
                builder.Append("&locale=" + locale);
            if (!String.IsNullOrEmpty(country))
                builder.Append("&country=" + country);
            if (timestamp != default(DateTime))
                builder.Append("&timestamp=" + timestamp.ToString("yyyy-MM-ddTHH:mm:ss"));
            return DownloadData<FeaturedPlaylists>(builder.ToString());
        }

        /// <summary>
        ///     Get a list of new album releases featured in Spotify (shown, for example, on a Spotify player’s “Browse” tab).
        /// </summary>
        /// <param name="country">A country: an ISO 3166-1 alpha-2 country code.</param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first item to return. Default: 0</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public NewAlbumReleases GetNewAlbumReleases(String country = "", int limit = 20, int offset = 0)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetNewAlbumReleases");
            limit = Math.Max(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/browse/new-releases");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(country))
                builder.Append("&country=" + country);
            return DownloadData<NewAlbumReleases>(builder.ToString());
        }

        /// <summary>
        ///     Get a list of categories used to tag items in Spotify (on, for example, the Spotify player’s “Browse” tab).
        /// </summary>
        /// <param name="country">
        ///     A country: an ISO 3166-1 alpha-2 country code. Provide this parameter if you want to narrow the
        ///     list of returned categories to those relevant to a particular country
        /// </param>
        /// <param name="locale">
        ///     The desired language, consisting of an ISO 639 language code and an ISO 3166-1 alpha-2 country
        ///     code, joined by an underscore
        /// </param>
        /// <param name="limit">The maximum number of categories to return. Default: 20. Minimum: 1. Maximum: 50. </param>
        /// <param name="offset">The index of the first item to return. Default: 0 (the first object).</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public CategoryList GetCategories(String country = "", String locale = "", int limit = 20, int offset = 0)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetCategories");
            limit = Math.Min(50, limit);
            StringBuilder builder = new StringBuilder(APIBase + "/browse/categories");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(country))
                builder.Append("&country=" + country);
            if (!String.IsNullOrEmpty(locale))
                builder.Append("&locale=" + locale);
            return DownloadData<CategoryList>(builder.ToString());
        }

        /// <summary>
        ///     Get a single category used to tag items in Spotify (on, for example, the Spotify player’s “Browse” tab).
        /// </summary>
        /// <param name="categoryId">The Spotify category ID for the category.</param>
        /// <param name="country">
        ///     A country: an ISO 3166-1 alpha-2 country code. Provide this parameter to ensure that the category
        ///     exists for a particular country.
        /// </param>
        /// <param name="locale">
        ///     The desired language, consisting of an ISO 639 language code and an ISO 3166-1 alpha-2 country
        ///     code, joined by an underscore
        /// </param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public Category GetCategory(String categoryId, String country = "", String locale = "")
        {
            StringBuilder builder = new StringBuilder(APIBase + "/browse/categories/" + categoryId);
            if (!String.IsNullOrEmpty(country))
                builder.Append("?country=" + country);
            if (!String.IsNullOrEmpty(locale))
                builder.Append((country == "" ? "?locale=" : "&locale=") + locale);
            return DownloadData<Category>(builder.ToString());
        }

        /// <summary>
        ///     Get a list of Spotify playlists tagged with a particular category.
        /// </summary>
        /// <param name="categoryId">The Spotify category ID for the category.</param>
        /// <param name="country">A country: an ISO 3166-1 alpha-2 country code.</param>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first item to return. Default: 0</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public CategoryPlaylist GetCategoryPlaylists(String categoryId, String country = "", int limit = 20, int offset = 0)
        {
            limit = Math.Min(50, limit);
            StringBuilder builder = new StringBuilder(APIBase + "/browse/categories/" + categoryId + "/playlists");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(country))
                builder.Append("&country=" + country);
            return DownloadData<CategoryPlaylist>(builder.ToString());
        }

        #endregion

        #region Follow

        /// <summary>
        ///     Get the current user’s followed artists.
        /// </summary>
        /// <param name="limit">The maximum number of items to return. Default: 20. Minimum: 1. Maximum: 50. </param>
        /// <param name="after">The last artist ID retrieved from the previous request.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public FollowedArtists GetFollowedArtists(int limit = 20, String after = "")
        {
            if(!UseAuth)
                throw new InvalidOperationException("Auth is required for GetFollowedArtists");
            limit = Math.Max(limit, 50);
            const FollowType followType = FollowType.Artist; //currently only artist is supported.
            StringBuilder builder = new StringBuilder(APIBase + "/me/following?type=" + followType.GetStringAttribute(""));
            builder.Append("&limit=" + limit);
            if (!String.IsNullOrEmpty(after))
                builder.Append("&after=" + after);
            return DownloadData<FollowedArtists>(builder.ToString());
        }

        /// <summary>
        ///     Add the current user as a follower of one or more artists or other Spotify users.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="ids">A list of the artist or the user Spotify IDs</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse Follow(FollowType followType, List<String> ids)
        {
            JObject ob = new JObject
            {
                {"ids", new JArray(ids)}
            };
            return UploadData<ErrorResponse>(APIBase + "/me/following?type=" + followType.GetStringAttribute(""), ob.ToString(Formatting.None), "PUT") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Add the current user as a follower of one or more artists or other Spotify users.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="id">Artists or the Users Spotify ID</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse Follow(FollowType followType, String id)
        {
            return Follow(followType, new List<string> {id});
        }

        /// <summary>
        ///     Remove the current user as a follower of one or more artists or other Spotify users.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="ids">A list of the artist or the user Spotify IDs</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse Unfollow(FollowType followType, List<String> ids)
        {
            JObject ob = new JObject
            {
                {"ids", new JArray(ids)}
            };
            return UploadData<ErrorResponse>(APIBase + "/me/following?type=" + followType.GetStringAttribute(""), ob.ToString(Formatting.None), "DELETE") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Remove the current user as a follower of one or more artists or other Spotify users.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="id">Artists or the Users Spotify ID</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse Unfollow(FollowType followType, String id)
        {
            return Unfollow(followType, new List<string> {id});
        }

        /// <summary>
        ///     Check to see if the current user is following one or more artists or other Spotify users.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="ids">A list of the artist or the user Spotify IDs to check</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ListResponse<Boolean> IsFollowing(FollowType followType, List<String> ids)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for IsFollowing");
            JToken res = DownloadData<JToken>(APIBase + "/me/following/contains?type=" + followType.GetStringAttribute("") + "&ids=" + string.Join(",", ids));
            if (res is JArray)
                return new ListResponse<Boolean> {List = res.ToObject<List<Boolean>>(), Error = null};
            return new ListResponse<Boolean> {List = null, Error = res["error"].ToObject<Error>()};
        }

        /// <summary>
        ///     Check to see if the current user is following one artist or another Spotify user.
        /// </summary>
        /// <param name="followType">The ID type: either artist or user.</param>
        /// <param name="id">Artists or the Users Spotify ID</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ListResponse<Boolean> IsFollowing(FollowType followType, String id)
        {
            return IsFollowing(followType, new List<string> {id});
        }

        /// <summary>
        ///     Add the current user as a follower of a playlist.
        /// </summary>
        /// <param name="ownerId">The Spotify user ID of the person who owns the playlist.</param>
        /// <param name="playlistId">
        ///     The Spotify ID of the playlist. Any playlist can be followed, regardless of its public/private
        ///     status, as long as you know its playlist ID.
        /// </param>
        /// <param name="showPublic">
        ///     If true the playlist will be included in user's public playlists, if false it will remain
        ///     private.
        /// </param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse FollowPlaylist(String ownerId, String playlistId, bool showPublic = true)
        {
            JObject body = new JObject
            {
                {"public", showPublic}
            };
            return UploadData<ErrorResponse>(APIBase + "/users/" + ownerId + "/playlists/" + playlistId + "/followers", body.ToString(Formatting.None), "PUT");
        }

        /// <summary>
        ///     Remove the current user as a follower of a playlist.
        /// </summary>
        /// <param name="ownerId">The Spotify user ID of the person who owns the playlist.</param>
        /// <param name="playlistId">The Spotify ID of the playlist that is to be no longer followed.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse UnfollowPlaylist(String ownerId, String playlistId)
        {
            return UploadData<ErrorResponse>(APIBase + "/users/" + ownerId + "/playlists/" + playlistId + "/followers", "", "DELETE");
        }

        /// <summary>
        ///     Check to see if one or more Spotify users are following a specified playlist.
        /// </summary>
        /// <param name="ownerId">The Spotify user ID of the person who owns the playlist.</param>
        /// <param name="playlistId">The Spotify ID of the playlist.</param>
        /// <param name="ids">A list of Spotify User IDs</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ListResponse<Boolean> IsFollowingPlaylist(String ownerId, String playlistId, List<String> ids)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for IsFollowingPlaylist");
            JToken res = DownloadData<JToken>(APIBase + "/users/" + ownerId + "/playlists/" + playlistId + "/followers/contains?ids=" + string.Join(",", ids));
            if (res is JArray)
                return new ListResponse<Boolean> {List = res.ToObject<List<Boolean>>(), Error = null};
            return new ListResponse<Boolean> {List = null, Error = res["error"].ToObject<Error>()};
        }

        /// <summary>
        ///     Check to see if one or more Spotify users are following a specified playlist.
        /// </summary>
        /// <param name="ownerId">The Spotify user ID of the person who owns the playlist.</param>
        /// <param name="playlistId">The Spotify ID of the playlist.</param>
        /// <param name="id">A Spotify User ID</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ListResponse<Boolean> IsFollowingPlaylist(String ownerId, String playlistId, String id)
        {
            return IsFollowingPlaylist(ownerId, playlistId, new List<string> {id});
        }

        #endregion

        #region Library

        /// <summary>
        ///     Save one or more tracks to the current user’s “Your Music” library.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse SaveTracks(List<String> ids)
        {
            JArray array = new JArray(ids);
            return UploadData<ErrorResponse>(APIBase + "/me/tracks/", array.ToString(Formatting.None), "PUT") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Save one track to the current user’s “Your Music” library.
        /// </summary>
        /// <param name="id">A Spotify ID</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse SaveTrack(String id)
        {
            return SaveTracks(new List<string> {id});
        }

        /// <summary>
        ///     Get a list of the songs saved in the current Spotify user’s “Your Music” library.
        /// </summary>
        /// <param name="limit">The maximum number of objects to return. Default: 20. Minimum: 1. Maximum: 50.</param>
        /// <param name="offset">The index of the first object to return. Default: 0 (i.e., the first object)</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public Paging<SavedTrack> GetSavedTracks(int limit = 20, int offset = 0, String market = "")
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetSavedTracks");
            limit = Math.Min(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/me/tracks");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<Paging<SavedTrack>>(builder.ToString());
        }

        /// <summary>
        ///     Remove one or more tracks from the current user’s “Your Music” library.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse RemoveSavedTracks(List<String> ids)
        {
            JArray array = new JArray(ids);
            return UploadData<ErrorResponse>(APIBase + "/me/tracks/", array.ToString(Formatting.None), "DELETE") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Check if one or more tracks is already saved in the current Spotify user’s “Your Music” library.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ListResponse<Boolean> CheckSavedTracks(List<String> ids)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for CheckSavedTracks");
            JToken res = DownloadData<JToken>(APIBase + "/me/tracks/contains?ids=" + string.Join(",", ids));
            if (res is JArray)
                return new ListResponse<Boolean> {List = res.ToObject<List<Boolean>>(), Error = null};
            return new ListResponse<Boolean> {List = null, Error = res["error"].ToObject<Error>()};
        }

        #endregion

        #region Playlists

        /// <summary>
        ///     Get a list of the playlists owned or followed by a Spotify user.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="limit">The maximum number of playlists to return. Default: 20. Minimum: 1. Maximum: 50. </param>
        /// <param name="offset">The index of the first playlist to return. Default: 0 (the first object)</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public Paging<SimplePlaylist> GetUserPlaylists(String userId, int limit = 20, int offset = 0)
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetUserPlaylists");
            limit = Math.Min(limit, 50);
            StringBuilder builder = new StringBuilder(APIBase + "/users/" + userId + "/playlists");
            builder.Append("?limit=" + limit);
            builder.Append("&offset=" + offset);
            return DownloadData<Paging<SimplePlaylist>>(builder.ToString());
        }

        /// <summary>
        ///     Get a playlist owned by a Spotify user.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="fields">
        ///     Filters for the query: a comma-separated list of the fields to return. If omitted, all fields are
        ///     returned.
        /// </param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public FullPlaylist GetPlaylist(String userId, String playlistId, String fields = "", String market = "")
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetPlaylist");
            StringBuilder builder = new StringBuilder(APIBase + "/users/" + userId + "/playlists/" + playlistId);
            builder.Append("?fields=" + fields);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<FullPlaylist>(builder.ToString());
        }

        /// <summary>
        ///     Get full details of the tracks of a playlist owned by a Spotify user.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="fields">
        ///     Filters for the query: a comma-separated list of the fields to return. If omitted, all fields are
        ///     returned.
        /// </param>
        /// <param name="limit">The maximum number of tracks to return. Default: 100. Minimum: 1. Maximum: 100.</param>
        /// <param name="offset">The index of the first object to return. Default: 0 (i.e., the first object)</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public Paging<PlaylistTrack> GetPlaylistTracks(String userId, String playlistId, String fields = "", int limit = 100, int offset = 0, String market = "")
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetPlaylistTracks");
            limit = Math.Max(limit, 100);
            StringBuilder builder = new StringBuilder(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks");
            builder.Append("?fields=" + fields);
            builder.Append("&limit=" + limit);
            builder.Append("&offset=" + offset);
            if (!String.IsNullOrEmpty(market))
                builder.Append("&market=" + market);
            return DownloadData<Paging<PlaylistTrack>>(builder.ToString());
        }

        /// <summary>
        ///     Create a playlist for a Spotify user. (The playlist will be empty until you add tracks.)
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistName">
        ///     The name for the new playlist, for example "Your Coolest Playlist". This name does not need
        ///     to be unique.
        /// </param>
        /// <param name="isPublic">
        ///     default true. If true the playlist will be public, if false it will be private. To be able to
        ///     create private playlists, the user must have granted the playlist-modify-private scope.
        /// </param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public FullPlaylist CreatePlaylist(String userId, String playlistName, Boolean isPublic = true)
        {
            JObject body = new JObject
            {
                {"name", playlistName},
                {"public", isPublic}
            };
            return UploadData<FullPlaylist>(APIBase + "/users/" + userId + "/playlists", body.ToString(Formatting.None));
        }

        /// <summary>
        ///     Change a playlist’s name and public/private state. (The user must, of course, own the playlist.)
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="newName">The new name for the playlist, for example "My New Playlist Title".</param>
        /// <param name="newPublic">If true the playlist will be public, if false it will be private.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse UpdatePlaylist(String userId, String playlistId, String newName = null, Boolean? newPublic = null)
        {
            JObject body = new JObject();
            if (newName != null)
                body.Add("name", newName);
            if (newPublic != null)
                body.Add("public", newPublic);
            return UploadData<ErrorResponse>(APIBase + "/users/" + userId + "/playlists/" + playlistId, body.ToString(Formatting.None), "PUT") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Replace all the tracks in a playlist, overwriting its existing tracks. This powerful request can be useful for
        ///     replacing tracks, re-ordering existing tracks, or clearing the playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="uris">A list of Spotify track URIs to set. A maximum of 100 tracks can be set in one request.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse ReplacePlaylistTracks(String userId, String playlistId, List<String> uris)
        {
            JObject body = new JObject
            {
                {"uris", new JArray(uris.Take(100))}
            };
            return UploadData<ErrorResponse>(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks", body.ToString(Formatting.None), "PUT") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Remove one or more tracks from a user’s playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="uris">
        ///     array of objects containing Spotify URI strings (and their position in the playlist). A maximum of
        ///     100 objects can be sent at once.
        /// </param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse RemovePlaylistTracks(String userId, String playlistId, List<DeleteTrackUri> uris)
        {
            JObject body = new JObject
            {
                {"tracks", JArray.FromObject(uris.Take(100))}
            };
            return UploadData<ErrorResponse>(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks", body.ToString(Formatting.None), "DELETE") ?? new ErrorResponse();
        }

        /// <summary>
        ///     Remove one or more tracks from a user’s playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="uri">Spotify URI</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse RemovePlaylistTrack(String userId, String playlistId, DeleteTrackUri uri)
        {
            return RemovePlaylistTracks(userId, playlistId, new List<DeleteTrackUri> {uri});
        }

        /// <summary>
        ///     Add one or more tracks to a user’s playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="uris">A list of Spotify track URIs to add</param>
        /// <param name="position">The position to insert the tracks, a zero-based index</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse AddPlaylistTracks(String userId, String playlistId, List<String> uris, int? position = null)
        {
            JObject body = new JObject
            {
                {"uris", JArray.FromObject(uris.Take(100))}
            };
            if (position == null)
                return UploadData<ErrorResponse>(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks", body.ToString(Formatting.None)) ?? new ErrorResponse();
            return UploadData<ErrorResponse>(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks?position=" + position, body.ToString(Formatting.None)) ?? new ErrorResponse();
        }

        /// <summary>
        ///     Add one or more tracks to a user’s playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="uri">A Spotify Track URI</param>
        /// <param name="position">The position to insert the tracks, a zero-based index</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public ErrorResponse AddPlaylistTrack(String userId, String playlistId, String uri, int? position = null)
        {
            return AddPlaylistTracks(userId, playlistId, new List<string> {uri}, position);
        }

        /// <summary>
        ///     Reorder a track or a group of tracks in a playlist.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <param name="playlistId">The Spotify ID for the playlist.</param>
        /// <param name="rangeStart">The position of the first track to be reordered.</param>
        /// <param name="insertBefore">The position where the tracks should be inserted. </param>
        /// <param name="rangeLength">The amount of tracks to be reordered. Defaults to 1 if not set.</param>
        /// <param name="snapshotId">The playlist's snapshot ID against which you want to make the changes.</param>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public Snapshot ReorderPlaylist(String userId, String playlistId, int rangeStart, int insertBefore, int rangeLength = 1, String snapshotId = "")
        {
            JObject body = new JObject
            {
                {"range_start", rangeStart},
                {"range_length", rangeLength},
                {"insert_before", insertBefore}
            };
            if (!String.IsNullOrEmpty(snapshotId))
                body.Add("snapshot_id", snapshotId);
            return UploadData<Snapshot>(APIBase + "/users/" + userId + "/playlists/" + playlistId + "/tracks", body.ToString(Formatting.None), "PUT");
        }

        #endregion

        #region Profiles

        /// <summary>
        ///     Get detailed profile information about the current user (including the current user’s username).
        /// </summary>
        /// <returns></returns>
        /// <remarks>AUTH NEEDED</remarks>
        public PrivateProfile GetPrivateProfile()
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for GetPrivateProfile");
            return DownloadData<PrivateProfile>(APIBase + "/me");
        }

        /// <summary>
        ///     Get public profile information about a Spotify user.
        /// </summary>
        /// <param name="userId">The user's Spotify user ID.</param>
        /// <returns></returns>
        public PublicProfile GetPublicProfile(String userId)
        {
            return DownloadData<PublicProfile>(APIBase + "/users/" + userId);
        }

        #endregion

        #region Tracks

        /// <summary>
        ///     Get Spotify catalog information for multiple tracks based on their Spotify IDs.
        /// </summary>
        /// <param name="ids">A list of the Spotify IDs for the tracks. Maximum: 50 IDs.</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        public SeveralTracks GetSeveralTracks(List<String> ids, String market = "")
        {
            if (String.IsNullOrEmpty(market))
                return DownloadData<SeveralTracks>(APIBase + "/tracks?ids=" + string.Join(",", ids.Take(50)));
            return DownloadData<SeveralTracks>(APIBase + "/tracks?market=" + market + "&ids=" + string.Join(",", ids.Take(50)));
        }

        /// <summary>
        ///     Get Spotify catalog information for a single track identified by its unique Spotify ID.
        /// </summary>
        /// <param name="id">The Spotify ID for the track.</param>
        /// <param name="market">An ISO 3166-1 alpha-2 country code. Provide this parameter if you want to apply Track Relinking.</param>
        /// <returns></returns>
        public FullTrack GetTrack(String id, String market = "")
        {
            if (String.IsNullOrEmpty(market))
                return DownloadData<FullTrack>(APIBase + "/tracks/" + id);
            return DownloadData<FullTrack>(APIBase + "/tracks/" + id + "?market=" + market);
        }

        #endregion

        #region Util

        public T UploadData<T>(String url, String uploadData, String method = "POST")
        {
            if (!UseAuth)
                throw new InvalidOperationException("Auth is required for all Upload-Actions");
            WebClient.SetHeader("Authorization", TokenType + " " + AccessToken);
            WebClient.SetHeader("Content-Type", "application/json");
            return WebClient.UploadJson<T>(url, uploadData, method);
        }

        public T DownloadData<T>(String url)
        {
            if (UseAuth)
                WebClient.SetHeader("Authorization", TokenType + " " + AccessToken);
            else
                WebClient.RemoveHeader("Authorization");
            return WebClient.DownloadJson<T>(url);
        }

        #endregion
    }
}