package cli

import (
	"context"
	"os"
	"os/signal"
	"syscall"
	"testing"
	"time"
)

// TestREQ157_SignalNotifyContext verifies that the root Execute
// installs a signal.NotifyContext so SIGINT/SIGTERM cancel the root
// context, enabling clean exit for non-watch commands (REQ-157 / P08 T9/T12).
func TestREQ157_SignalNotifyContext(t *testing.T) {
	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer cancel()

	// Verify the context is not yet cancelled.
	select {
	case <-ctx.Done():
		t.Fatal("context should not be cancelled before signal")
	default:
	}

	// Send SIGINT to self.
	p, err := os.FindProcess(os.Getpid())
	if err != nil {
		t.Fatalf("find process: %v", err)
	}

	// Run in a goroutine so we can timeout.
	done := make(chan struct{})
	go func() {
		defer close(done)
		_ = p.Signal(os.Interrupt)
	}()

	select {
	case <-ctx.Done():
		// Expected: context is cancelled by the signal.
	case <-time.After(2 * time.Second):
		t.Fatal("context was not cancelled within 2s of SIGINT")
	}

	// Verify the cause is the signal.
	if ctx.Err() != context.Canceled {
		t.Errorf("ctx.Err() = %v, want %v", ctx.Err(), context.Canceled)
	}

	// Restore default signal handling so subsequent tests aren't affected.
	signal.Reset(os.Interrupt, syscall.SIGTERM)
}