package web

import (
	"sync"
	"testing"

	"gitea.dooplex.hu/admin/felhom-controller/internal/integrations"
)

// TestIntegrationManagerNoRace is a regression test for M25. NewServer launches
// the SyncFileBrowserMounts goroutine (which reads s.integrationMgr) from inside
// the constructor, BEFORE main.go calls SetIntegrationManager. With a plain
// pointer field that write/read pair is a data race; this test reproduces the
// concurrent access and must run clean under `go test -race`.
//
// On the pre-fix code (plain `integrationMgr *integrations.Manager`, written via
// `s.integrationMgr = mgr` and read via `s.integrationMgr`) the race detector
// flags this. With the atomic.Pointer field it is clean. Run with:
//
//	go test -race ./internal/web/ -run IntegrationManagerNoRace
func TestIntegrationManagerNoRace(t *testing.T) {
	var s Server // zero value: atomic.Pointer field is usable as-is

	const iters = 2000
	var wg sync.WaitGroup

	// Writer — mirrors main.go calling SetIntegrationManager after construction.
	wg.Add(1)
	go func() {
		defer wg.Done()
		for i := 0; i < iters; i++ {
			s.SetIntegrationManager(&integrations.Manager{})
		}
	}()

	// Reader — mirrors the constructor-launched SyncFileBrowserMounts goroutine
	// reading the field concurrently with the write above.
	wg.Add(1)
	go func() {
		defer wg.Done()
		for i := 0; i < iters; i++ {
			_ = s.integrationMgr.Load()
		}
	}()

	wg.Wait()

	// And the value round-trips.
	m := &integrations.Manager{}
	s.SetIntegrationManager(m)
	if s.integrationMgr.Load() != m {
		t.Fatal("SetIntegrationManager/Load round-trip mismatch")
	}
}