using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace HarmonyWinUI.Models
{
	class MusicBrainz
	{
		private String URLprefix = "https://musicbrainz.org/ws/2/";
		private static readonly HttpClient httpClient = createHttpClient();

		public async Task<List<MusicBrainzArtist>> getArtists(String query)
		{
			ArgumentException.ThrowIfNullOrWhiteSpace(query);

			string searchQuery = Uri.EscapeDataString($"artist:{query}");
			MusicBrainzArtistResponse? response = await getData<MusicBrainzArtistResponse>(
				$"artist?query={searchQuery}&fmt=json&limit=10"
			);

			return response?.Artists ?? new List<MusicBrainzArtist>();
		}

		private async Task<T?> getData<T>(String relativeURL)
		{
			Uri requestURL = new Uri(new Uri(URLprefix), relativeURL);

			using HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, requestURL);
			using HttpResponseMessage response = await httpClient.SendAsync(
				request,
				HttpCompletionOption.ResponseHeadersRead
			);
			response.EnsureSuccessStatusCode();

			await using Stream jsonStream = await response.Content.ReadAsStreamAsync();
			return await JsonSerializer.DeserializeAsync<T>(jsonStream);
		}

		private static HttpClient createHttpClient()
		{
			HttpClient client = new HttpClient
			{
				Timeout = TimeSpan.FromSeconds(30)
			};
			client.DefaultRequestHeaders.UserAgent.ParseAdd(
				"HarmonyWinUI/1.0 (https://harmony.tpsoft.org/)"
			);

			return client;
		}

		private sealed class MusicBrainzArtistResponse
		{
			[JsonPropertyName("artists")]
			public List<MusicBrainzArtist>? Artists { get; set; }
		}
	}

	public class MusicBrainzArtist
	{
		public string? ID { get; set; }
		public string? Type { get; set; }
		[JsonPropertyName("type-id")]
		public string? TypeID { get; set; }
		public int? Score { get; set; }
		public string? Name { get; set; } = "";
		public string? Gender { get; set; }
		public string? Country { get; set; }
		public string? ImageURL { get; set; }

		public MusicBrainzArtist() { }

		public MusicBrainzArtist(
			string? id,
			string? type,
			string? typeID,
			int? score,
			string? name,
			string? gender,
			string? country)
		{
			this.ID = id;
			this.Type = type;
			this.TypeID = typeID;
			this.Score = score;
			this.Name = name;
			this.Gender = gender;
			this.Country = country;
		}

	}
}