// File generated from our OpenAPI spec by Stainless.

package com.openai.services.async

import com.openai.core.ClientOptions
import com.openai.core.JsonValue
import com.openai.core.RequestOptions
import com.openai.core.SecurityOptions
import com.openai.core.handlers.errorBodyHandler
import com.openai.core.handlers.errorHandler
import com.openai.core.handlers.jsonHandler
import com.openai.core.handlers.mapJson
import com.openai.core.handlers.sseHandler
import com.openai.core.http.AsyncStreamResponse
import com.openai.core.http.HttpMethod
import com.openai.core.http.HttpRequest
import com.openai.core.http.HttpResponse
import com.openai.core.http.HttpResponse.Handler
import com.openai.core.http.HttpResponseFor
import com.openai.core.http.StreamResponse
import com.openai.core.http.json
import com.openai.core.http.map
import com.openai.core.http.parseable
import com.openai.core.http.toAsync
import com.openai.core.prepareAsync
import com.openai.models.completions.Completion
import com.openai.models.completions.CompletionCreateParams
import java.util.concurrent.CompletableFuture
import java.util.function.Consumer

/**
 * Given a prompt, the model will return one or more predicted completions, and can also return the
 * probabilities of alternative tokens at each position.
 */
class CompletionServiceAsyncImpl internal constructor(private val clientOptions: ClientOptions) :
    CompletionServiceAsync {

    private val withRawResponse: CompletionServiceAsync.WithRawResponse by lazy {
        WithRawResponseImpl(clientOptions)
    }

    override fun withRawResponse(): CompletionServiceAsync.WithRawResponse = withRawResponse

    override fun withOptions(modifier: Consumer<ClientOptions.Builder>): CompletionServiceAsync =
        CompletionServiceAsyncImpl(clientOptions.toBuilder().apply(modifier::accept).build())

    override fun create(
        params: CompletionCreateParams,
        requestOptions: RequestOptions,
    ): CompletableFuture<Completion> =
        // post /completions
        withRawResponse().create(params, requestOptions).thenApply { it.parse() }

    override fun createStreaming(
        params: CompletionCreateParams,
        requestOptions: RequestOptions,
    ): AsyncStreamResponse<Completion> =
        // post /completions
        withRawResponse()
            .createStreaming(params, requestOptions)
            .thenApply { it.parse() }
            .toAsync(clientOptions.streamHandlerExecutor)

    class WithRawResponseImpl internal constructor(private val clientOptions: ClientOptions) :
        CompletionServiceAsync.WithRawResponse {

        private val errorHandler: Handler<HttpResponse> =
            errorHandler(errorBodyHandler(clientOptions.jsonMapper))

        override fun withOptions(
            modifier: Consumer<ClientOptions.Builder>
        ): CompletionServiceAsync.WithRawResponse =
            CompletionServiceAsyncImpl.WithRawResponseImpl(
                clientOptions.toBuilder().apply(modifier::accept).build()
            )

        private val createHandler: Handler<Completion> =
            jsonHandler<Completion>(clientOptions.jsonMapper)

        override fun create(
            params: CompletionCreateParams,
            requestOptions: RequestOptions,
        ): CompletableFuture<HttpResponseFor<Completion>> {
            val request =
                HttpRequest.builder()
                    .method(HttpMethod.POST)
                    .baseUrl(clientOptions.baseUrl())
                    .addPathSegments("completions")
                    .body(json(clientOptions.jsonMapper, params._body()))
                    .build()
                    .prepareAsync(
                        clientOptions,
                        params,
                        SecurityOptions.builder().bearerAuth(true).build(),
                    )
            val requestOptions = requestOptions.applyDefaults(RequestOptions.from(clientOptions))
            return request
                .thenComposeAsync { clientOptions.httpClient.executeAsync(it, requestOptions) }
                .thenApply { response ->
                    errorHandler.handle(response).parseable {
                        response
                            .use { createHandler.handle(it) }
                            .also {
                                if (requestOptions.responseValidation!!) {
                                    it.validate()
                                }
                            }
                    }
                }
        }

        private val createStreamingHandler: Handler<StreamResponse<Completion>> =
            sseHandler(clientOptions.jsonMapper).mapJson<Completion>()

        override fun createStreaming(
            params: CompletionCreateParams,
            requestOptions: RequestOptions,
        ): CompletableFuture<HttpResponseFor<StreamResponse<Completion>>> {
            val request =
                HttpRequest.builder()
                    .method(HttpMethod.POST)
                    .baseUrl(clientOptions.baseUrl())
                    .addPathSegments("completions")
                    .putHeader("Accept", "text/event-stream")
                    .body(
                        json(
                            clientOptions.jsonMapper,
                            params
                                ._body()
                                .toBuilder()
                                .putAdditionalProperty("stream", JsonValue.from(true))
                                .build(),
                        )
                    )
                    .build()
                    .prepareAsync(
                        clientOptions,
                        params,
                        SecurityOptions.builder().bearerAuth(true).build(),
                    )
            val requestOptions = requestOptions.applyDefaults(RequestOptions.from(clientOptions))
            return request
                .thenComposeAsync { clientOptions.httpClient.executeAsync(it, requestOptions) }
                .thenApply { response ->
                    errorHandler.handle(response).parseable {
                        response
                            .let { createStreamingHandler.handle(it) }
                            .let { streamResponse ->
                                if (requestOptions.responseValidation!!) {
                                    streamResponse.map { it.validate() }
                                } else {
                                    streamResponse
                                }
                            }
                    }
                }
        }
    }
}
