package worker

import (
	"testing"

	"juhe-factory/api/internal/model"

	"github.com/google/uuid"
)

func TestSelectFairCandidatesHonorsTotalCapacity(t *testing.T) {
	users := make([]uuid.UUID, 50)
	for index := range users {
		users[index] = uuid.New()
	}
	candidates := make([]model.GenerationTask, 0, 501)
	for index := 0; index < 501; index++ {
		candidates = append(candidates, model.GenerationTask{ID: uuid.New(), UserID: users[index%len(users)]})
	}
	selected := selectFairCandidates(candidates, map[uuid.UUID]int{}, 500, 10)
	if len(selected) != 500 {
		t.Fatalf("selected %d tasks, want 500", len(selected))
	}
}

func TestSelectFairCandidatesHonorsUserCapacity(t *testing.T) {
	userID := uuid.New()
	candidates := make([]model.GenerationTask, 11)
	for index := range candidates {
		candidates[index] = model.GenerationTask{ID: uuid.New(), UserID: userID}
	}
	selected := selectFairCandidates(candidates, map[uuid.UUID]int{}, 500, 10)
	if len(selected) != 10 {
		t.Fatalf("selected %d tasks, want 10", len(selected))
	}
}

func TestSelectFairCandidatesRoundRobin(t *testing.T) {
	first, second := uuid.New(), uuid.New()
	candidates := []model.GenerationTask{
		{ID: uuid.New(), UserID: first}, {ID: uuid.New(), UserID: first},
		{ID: uuid.New(), UserID: second}, {ID: uuid.New(), UserID: second},
	}
	selected := selectFairCandidates(candidates, map[uuid.UUID]int{}, 4, 10)
	want := []uuid.UUID{first, second, first, second}
	for index := range want {
		if selected[index].UserID != want[index] {
			t.Fatalf("position %d user %s, want %s", index, selected[index].UserID, want[index])
		}
	}
}

// TestCanRetrySubmission 验证提交超时会自动重试，并在第五次失败后停止。
func TestCanRetrySubmission(t *testing.T) {
	for attempt := 1; attempt < maxSubmitAttempts; attempt++ {
		if !canRetrySubmission(attempt) {
			t.Fatalf("attempt %d should be retryable", attempt)
		}
	}
	if canRetrySubmission(maxSubmitAttempts) {
		t.Fatalf("attempt %d should reach retry limit", maxSubmitAttempts)
	}
}