// Demonstrates load balancing across multiple backend endpoints with
// circuit breaking and health-checked failover.
package main

import (
	"context"
	"fmt"
	"log"
	"log/slog"
	"time"

	"git.codelab.vc/pkg/httpx"
	"git.codelab.vc/pkg/httpx/balancer"
	"git.codelab.vc/pkg/httpx/circuitbreaker"
	"git.codelab.vc/pkg/httpx/retry"
)

func main() {
	client := httpx.New(
		httpx.WithEndpoints(
			balancer.Endpoint{URL: "http://localhost:8081", Weight: 3},
			balancer.Endpoint{URL: "http://localhost:8082", Weight: 1},
		),
		httpx.WithBalancer(
			balancer.WithStrategy(balancer.WeightedRandom()),
			balancer.WithHealthCheck(
				balancer.WithHealthInterval(5*time.Second),
				balancer.WithHealthPath("/healthz"),
			),
		),
		httpx.WithCircuitBreaker(
			circuitbreaker.WithFailureThreshold(5),
			circuitbreaker.WithOpenDuration(30*time.Second),
		),
		httpx.WithRetry(
			retry.WithMaxAttempts(3),
		),
		httpx.WithLogger(slog.Default()),
	)
	defer client.Close()

	ctx := context.Background()

	for i := range 5 {
		resp, err := client.Get(ctx, fmt.Sprintf("/api/item/%d", i))
		if err != nil {
			log.Printf("request %d failed: %v", i, err)
			continue
		}

		body, _ := resp.String()
		fmt.Printf("request %d → %d: %s\n", i, resp.StatusCode, body)
	}
}