package agent

import "sync"

// Fifo is a thread-safe queue for buffered prompts.
type Fifo struct {
	mu    sync.Mutex
	items []string
}

// Push appends a prompt to the queue.
func (f *Fifo) Push(s string) {
	f.mu.Lock()
	f.items = append(f.items, s)
	f.mu.Unlock()
}

// Pop removes and returns the next prompt.
// Returns ("", false) if the queue is empty.
func (f *Fifo) Pop() (string, bool) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if len(f.items) == 0 {
		return "", false
	}
	s := f.items[0]
	f.items = f.items[1:]
	return s, true
}