package chatclient_test

import (
	"context"
	"log"

	chatclient "gitea.fe.kaien.ru/kaien/l-ai-chat-client-go"
)

func ExampleNew() {
	ctx := context.Background()
	client, err := chatclient.New(ctx, "chat.internal:443",
		chatclient.WithStaticToken("service-token-from-secret-store"),
	)
	if err != nil {
		log.Fatal(err)
	}
	defer client.Close()
}

func ExampleClient_PostMessage() {
	ctx := context.Background()
	client, _ := chatclient.New(ctx, "chat.internal:443",
		chatclient.WithStaticToken("service-token-from-secret-store"),
	)
	defer client.Close()

	key := "security-agent:logical-action-123"
	_, err := client.PostMessage(ctx, chatclient.PostMessageRequest{
		TopicID:        "11111111-1111-1111-1111-111111111111",
		Content:        "scan completed",
		IdempotencyKey: key,
	})
	if err != nil {
		log.Fatal(err)
	}
}

func ExampleSubscription_sequential() {
	ctx := context.Background()
	client, _ := chatclient.New(ctx, "chat.internal:443",
		chatclient.WithStaticToken("service-token-from-secret-store"),
	)
	defer client.Close()

	sub, err := client.Subscribe(ctx, chatclient.SubscribeRequest{
		TopicID: "11111111-1111-1111-1111-111111111111",
	})
	if err != nil {
		log.Fatal(err)
	}
	defer sub.Close()

	for delivery := range sub.Deliveries() {
		if err := process(ctx, delivery); err != nil {
			log.Fatal(err)
		}
		if err := sub.MarkProcessed(ctx, delivery); err != nil {
			log.Fatal(err)
		}
	}
	if err := sub.Err(); err != nil {
		log.Fatal(err)
	}
}

func ExampleSubscription_concurrentProcessing() {
	ctx := context.Background()
	client, _ := chatclient.New(ctx, "chat.internal:443",
		chatclient.WithStaticToken("service-token-from-secret-store"),
	)
	defer client.Close()

	sub, err := client.Subscribe(ctx, chatclient.SubscribeRequest{
		TopicID: "11111111-1111-1111-1111-111111111111",
	})
	if err != nil {
		log.Fatal(err)
	}
	defer sub.Close()

	sem := make(chan struct{}, 4)
	for delivery := range sub.Deliveries() {
		delivery := delivery
		sem <- struct{}{}
		go func() {
			defer func() { <-sem }()
			if err := process(ctx, delivery); err != nil {
				_ = sub.Close()
				return
			}
			// Safe even when goroutines finish out of order: MarkProcessed
			// advances only the processed prefix in actual delivery order.
			_ = sub.MarkProcessed(ctx, delivery)
		}()
	}
}

func process(context.Context, chatclient.Delivery) error { return nil }