using Discord.API.Rest;
using Serilog;

namespace Discord.API;

public class DiscordClient
{
    private static readonly string ApiBaseUrl = "https://discord.com/api/v10"; //TODO Export version number to a separate constant

    private string ApiKey;
    private RestClient Rest;
    private GatewayClient? Gateway;
    private TimeProvider TimeProvider;

    public DiscordClient(string api_key){
        TimeProvider = TimeProvider.System;
        this.ApiKey = api_key;
        Rest = new RestClient(ApiBaseUrl, ApiKey);
        Task.Run(ConnectGateway);
    }

    internal DiscordClient(string api_key, TimeProvider time_provider, HttpMessageHandler msg_handler){
        this.TimeProvider=time_provider;
        this.ApiKey=api_key;
        Rest = new RestClient(ApiBaseUrl, ApiKey, msg_handler);
        Task.Run(ConnectGateway);
    }

    private async Task ConnectGateway(){
        RestResponse<GetGatewayResponse> resp = await Rest.GetGateway();

        while(resp is not RestSuccessResponse<GetGatewayResponse>){
            Log.Debug("DiscordClient: Failed to get gateway url");
            if(resp is RestErrorResponse<GetGatewayResponse> error){
                Log.Error("DiscordClient: Get gateway returned error: {error_msg}", error.Error.Message);
                break;
            }else{
                Log.Information("DiscordClient: Get gateway failed: {ex}; Retrying later", (resp as RestFailResponse<GetGatewayResponse>)!.Exception?.Message);
            }
            await Task.Delay(TimeSpan.FromMilliseconds(2000), TimeProvider, cancellationToken: default);
            resp = await Rest.GetGateway();
        }

        Log.Information("DiscordClient: Gateway url: {gateway_url}", resp.Value.Url);

        Gateway = new GatewayClient(resp.Value.Url, ApiKey, TimeProvider);

        Log.Information("DiscordClient: Started gateway");
    }
}