package usecase

import (
	"context"
	"sync"
	"testing"
	"time"

	jobDomain "apps/backend/internal/module/job/domain"
	jobRepo "apps/backend/internal/module/job/repository"
	jobUC "apps/backend/internal/module/job/usecase"
	"apps/backend/internal/module/radar/domain"
	"apps/backend/internal/module/radar/repository"
)

func TestPastDailySweepSlot(t *testing.T) {
	day := time.Date(2026, 7, 31, 0, 0, 0, 0, time.UTC)
	before := day.Add(21 * time.Hour)
	at := day.Add(22 * time.Hour)
	after := day.Add(22*time.Hour + time.Minute)
	if PastDailySweepSlot(before) {
		t.Fatal("21:00 UTC should not schedule")
	}
	if !PastDailySweepSlot(at) {
		t.Fatal("22:00 UTC should schedule")
	}
	if !PastDailySweepSlot(after) {
		t.Fatal("22:01 UTC should schedule")
	}
}

func TestScheduleDailySweeps_SW01_TwoActiveWatches(t *testing.T) {
	ctx := context.Background()
	radarMem := repository.NewMemory()
	jobMem := jobRepo.NewMemory()
	jobs := jobUC.New(jobMem)
	svc := New(radarMem)
	svc.SweepJobs = SweepJobSchedulerFunc(func(ctx context.Context, ownerUID int64, watchID string, runAt int64) (string, error) {
		j, err := jobs.ScheduleRadarSweep(ctx, ownerUID, watchID, runAt)
		if err != nil {
			return "", err
		}
		return j.ID, nil
	})

	// Seed profile so CreateWatch would pass if we used usecase; write watches directly.
	now := domain.NowNano()
	for _, id := range []string{"w-a", "w-b"} {
		w := &domain.RadarWatch{
			ID: id, OwnerUID: 100, Terms: []string{"婚攝"}, Status: domain.WatchActive,
			CreatedAt: now, UpdatedAt: now,
		}
		if err := radarMem.SaveWatch(ctx, w); err != nil {
			t.Fatal(err)
		}
	}
	// paused must not get a job
	_ = radarMem.SaveWatch(ctx, &domain.RadarWatch{
		ID: "w-paused", OwnerUID: 100, Terms: []string{"x"}, Status: domain.WatchPaused,
		CreatedAt: now, UpdatedAt: now,
	})

	// Before 22:00 → no jobs
	morning := time.Date(2026, 7, 31, 10, 0, 0, 0, time.UTC)
	n, err := svc.ScheduleDailySweeps(ctx, morning)
	if err != nil {
		t.Fatal(err)
	}
	if n != 0 {
		t.Fatalf("before slot: want 0 jobs, got %d", n)
	}

	// After 22:00 → two jobs (active only)
	evening := time.Date(2026, 7, 31, 22, 5, 0, 0, time.UTC)
	n, err = svc.ScheduleDailySweeps(ctx, evening)
	if err != nil {
		t.Fatal(err)
	}
	if n != 2 {
		t.Fatalf("SW-01: want 2 jobs scheduled, got %d", n)
	}

	list, err := jobs.List(ctx, 100)
	if err != nil {
		t.Fatal(err)
	}
	sweepJobs := 0
	refs := map[string]bool{}
	for _, j := range list {
		if j.TemplateType != jobDomain.TemplateRadarSweep {
			continue
		}
		sweepJobs++
		if refs[j.RefID] {
			t.Fatalf("duplicate ref %s", j.RefID)
		}
		refs[j.RefID] = true
		if j.Status != jobDomain.StatusQueued {
			t.Fatalf("status=%s", j.Status)
		}
	}
	if sweepJobs != 2 {
		t.Fatalf("want 2 radar_sweep jobs, got %d", sweepJobs)
	}

	// Idempotent: second tick same day does not create more
	n2, err := svc.ScheduleDailySweeps(ctx, evening)
	if err != nil {
		t.Fatal(err)
	}
	if n2 != 2 {
		t.Fatalf("re-tick should still report 2 watches ensured, got %d", n2)
	}
	list, _ = jobs.List(ctx, 100)
	count := 0
	for _, j := range list {
		if j.TemplateType == jobDomain.TemplateRadarSweep {
			count++
		}
	}
	if count != 2 {
		t.Fatalf("after re-tick want still 2 jobs, got %d", count)
	}
}

func TestScheduleRadarSweep_ConcurrentNoDuplicate(t *testing.T) {
	ctx := context.Background()
	jobs := jobUC.New(jobRepo.NewMemory())
	runAt := time.Date(2026, 7, 31, 22, 0, 0, 0, time.UTC).UnixNano()

	var wg sync.WaitGroup
	ids := make(chan string, 20)
	for i := 0; i < 10; i++ {
		wg.Add(1)
		go func() {
			defer wg.Done()
			j, err := jobs.ScheduleRadarSweep(ctx, 7, "watch-x", runAt)
			if err != nil {
				t.Errorf("schedule: %v", err)
				return
			}
			ids <- j.ID
		}()
	}
	wg.Wait()
	close(ids)

	seen := map[string]bool{}
	for id := range ids {
		seen[id] = true
	}
	if len(seen) != 1 {
		t.Fatalf("concurrent schedule should yield one job id, got %d distinct", len(seen))
	}
	list, _ := jobs.List(ctx, 7)
	if len(list) != 1 {
		t.Fatalf("want 1 job in store, got %d", len(list))
	}
}