package application

import (
	"context"
	"time"

	"github.com/mudler/LocalAI/core/config"
	"github.com/mudler/LocalAI/pkg/model"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
)

var _ = Describe("applyFailoverWarmTargets", func() {
	It("returns promptly even when the preload call blocks", func() {
		// Guards against a regression to a synchronous preload loop: onWarm
		// runs on the failover manager's single scheduler goroutine, so a
		// blocking loader here must not block the caller.
		started := make(chan struct{})
		release := make(chan struct{})
		orig := preloadModelByName
		preloadModelByName = func(ctx context.Context, cl *config.ModelConfigLoader, ml *model.ModelLoader, appConfig *config.ApplicationConfig, name string) ([]string, error) {
			close(started)
			<-release // never released within the test's timeout
			return nil, nil
		}
		DeferCleanup(func() { preloadModelByName = orig })
		DeferCleanup(func() { close(release) })

		app := &Application{applicationConfig: &config.ApplicationConfig{Context: context.Background()}}

		callReturned := make(chan struct{})
		go func() {
			defer GinkgoRecover()
			app.applyFailoverWarmTargets([]string{"warm-a"})
			close(callReturned)
		}()

		Eventually(callReturned, time.Second).Should(BeClosed(), "applyFailoverWarmTargets must not wait on the preload goroutine")
		Eventually(started, time.Second).Should(BeClosed(), "the preload goroutine should still run in the background")
	})
})