open Microsoft.Extensions.DependencyInjection

open Microsoft.Extensions.Hosting

open Telegram.Bot

open FSharp.Example.Services

type ReceiverSvc = ReceiverService<UpdateHandler>

type BotConfiguration() =

member val BotToken: string

let createHostBuilder args =

Host.CreateDefaultBuilder(args)

.ConfigureServices(fun context services ->

let cfg = context.Configuration.GetSection(nameof(BotConfiguration))

let token = cfg.["BotToken"]

// Register named HttpClient to benefits from IHttpClientFactory

// and consume it with ITelegramBotClient typed client.

// More read:

// https://docs.microsoft.com/en-us/aspnet/core/fundamentals/http-requests?view=aspnetcore-5.0#typed-clients

// https://docs.microsoft.com/en-us/dotnet/architecture/microservices/implement-resilient-applications/use-httpclientfactory-to-implement-resilient-http-requests

services.AddHttpClient("telegram_bot_client").AddTypedClient<ITelegramBotClient>(

fun httpClient sp ->

let options = TelegramBotClientOptions(token)

TelegramBotClient(options, httpClient) :> ITelegramBotClient

) |> ignore

services.AddScoped<UpdateHandler>() |> ignore

services.AddScoped<ReceiverSvc>() |> ignore

services.AddHostedService<PollingService<ReceiverSvc>>() |> ignore)

[<EntryPoint>]

let main args =

createHostBuilder(args).Build().Run()

0 // exit code