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

namespace SharpChat.Flashii {
    public class FlashiiAuthInfo {
        [JsonPropertyName("success")]
        public bool Success { get; set; }

        [JsonPropertyName("reason")]
        public string Reason { get; set; } = "none";

        [JsonPropertyName("user_id")]
        public long UserId { get; set; }

        [JsonPropertyName("username")]
        public string Username { get; set; }

        [JsonPropertyName("colour_raw")]
        public int ColourRaw { get; set; }

        [JsonPropertyName("hierarchy")]
        public int Rank { get; set; }

        [JsonPropertyName("is_silenced")]
        public DateTimeOffset SilencedUntil { get; set; }

        [JsonPropertyName("perms")]
        public ChatUserPermissions Permissions { get; set; }

        private const string SIG_FMT = "verify#{0}#{1}#{2}";

        public static async Task<FlashiiAuthInfo> VerifyAsync(HttpClient client, string method, string token, string ipAddr) {
            if(client == null)
                throw new ArgumentNullException(nameof(client));

            method ??= string.Empty;
            token ??= string.Empty;
            ipAddr ??= string.Empty;

            string sig = string.Format(SIG_FMT, method, token, ipAddr);

            HttpRequestMessage req = new(HttpMethod.Post, FlashiiUrls.VerifyURL) {
                Content = new FormUrlEncodedContent(new Dictionary<string, string> {
                    { "method", method },
                    { "token", token },
                    { "ipaddr", ipAddr },
                }),
                Headers = {
                    { "X-SharpChat-Signature", sig.GetSignedHash() },
                },
            };

            using HttpResponseMessage res = await client.SendAsync(req);

            return JsonSerializer.Deserialize<FlashiiAuthInfo>(
                await res.Content.ReadAsByteArrayAsync()
            );
        }
    }
}