tgbotapi/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/BotBuilder.kt

package dev.inmo.tgbotapi.extensions.api

import dev.inmo.tgbotapi.bot.TelegramBot
import dev.inmo.tgbotapi.utils.TelegramAPIUrlsKeeper
import dev.inmo.tgbotapi.utils.telegramBotAPIDefaultUrl
import io.ktor.client.HttpClient
import io.ktor.client.HttpClientConfig
import io.ktor.client.engine.*

/**
 * @param proxy Standard ktor [ProxyConfig]
 * @param ktorClientEngine Engine like [io.ktor.client.engine.cio.CIO]
 * @param ktorClientConfig Config block for preconfiguring of bot [HttpClient]
 */
data class BotBuilder internal constructor(
    var proxy: ProxyConfig? = null,
    var ktorClientEngineFactory: HttpClientEngineFactory<HttpClientEngineConfig>? = null,
    var ktorClientConfig: (HttpClientConfig<*>.() -> Unit) ? = null
) {
    internal fun createHttpClient(): HttpClient = ktorClientEngineFactory ?.let {
        HttpClient(
            it.create {
                this@create.proxy = this@BotBuilder.proxy ?: this@create.proxy
            }
        ) {
            ktorClientConfig ?.let { it() }
        }
    } ?: HttpClient {
        ktorClientConfig ?.let { it() }
        engine {
            this@engine.proxy = this@BotBuilder.proxy ?: this@engine.proxy
        }
    }
}

/**
 * @return Created by [telegramBotWithCustomClientConfig] function [TelegramBot]. This executor will be preconfigured using [token] and
 * [block]
 */
fun buildBot(
    token: String,
    apiUrl: String = telegramBotAPIDefaultUrl,
    block: BotBuilder.() -> Unit
) = telegramBot(
    TelegramAPIUrlsKeeper(token, apiUrl),
    BotBuilder().apply(block).createHttpClient()
)