package cyutils

import (
	"net/http"
	"sync"
	"time"

	"golang.org/x/time/rate"
)

func WithWorkers[T any](workers int, arr []T, fn func(worker int, item T)) {
	workersChan := make(chan struct{}, workers)
	ingestChan := make(chan T, len(arr))

	for _, item := range arr {
		ingestChan <- item
	}
	close(ingestChan)

	wg := sync.WaitGroup{}
	for i := 0; i < workers; i++ {
		workersChan <- struct{}{}
		wg.Add(1)
		go func(worker int) {
			defer wg.Done()
			defer func() { <-workersChan }()
			for {
				item, ok := <-ingestChan
				// We're done processing totally
				if !ok {
					return
				}
				fn(worker, item)
			}
		}(i)
	}
	wg.Wait()
}
func Batched[T any](arr []T, batchSize int, fn func(batch []T)) {
	for i := 0; i < len(arr); i += batchSize {
		start := i
		end := min(i+batchSize, len(arr))
		batch := arr[start:end]
		fn(batch)
	}
}

type RateLimitedTransport struct {
	base    http.RoundTripper // Underlying transport
	limiter *rate.Limiter     // Rate limiter
}

// RoundTrip enforces rate limiting before executing the request
func (t *RateLimitedTransport) RoundTrip(req *http.Request) (*http.Response, error) {
	ctx := req.Context()
	if err := t.limiter.Wait(ctx); err != nil {
		return nil, err // Handle context cancellation/timeout
	}
	return t.base.RoundTrip(req)
}
func LimitedHttp(rps float64, burst int, timeout time.Duration) *http.Client {
	baseTransport := &http.Transport{
		MaxIdleConns:        100,
		MaxIdleConnsPerHost: 10,
		IdleConnTimeout:     10 * time.Second,
	}

	// Initialize rate limiter
	limiter := rate.NewLimiter(rate.Limit(rps), burst)

	// Wrap transport with rate limiting
	transport := &RateLimitedTransport{
		base:    baseTransport,
		limiter: limiter,
	}

	// Return configured client
	return &http.Client{
		Transport: transport,
		Timeout:   timeout,
	}
}