package scoreboard

import (
	"context"
	"errors"
	"testing"
	"time"
)

func sample() []Entry {
	return []Entry{
		{Rank: 1, Username: "skav", Score: 26435},
		{Rank: 2, Username: "Kkameleon", Score: 26000},
		{Rank: 3, Username: "ENOENT", Score: 25900},
	}
}

func TestStoreLookups(t *testing.T) {
	s := NewStore()
	if s.Ready() {
		t.Fatal("empty store should not be ready")
	}
	s.Set(sample(), time.Now())
	if !s.Ready() || s.Len() != 3 {
		t.Fatalf("ready=%v len=%d", s.Ready(), s.Len())
	}

	if e, ok := s.ByRank(2); !ok || e.Username != "Kkameleon" {
		t.Errorf("ByRank(2) = %+v ok=%v", e, ok)
	}
	if e, ok := s.ByUsername("SKAV"); !ok || e.Rank != 1 {
		t.Errorf("ByUsername(SKAV) = %+v ok=%v (case-insensitive lookup failed)", e, ok)
	}
	if _, ok := s.ByUsername("nobody"); ok {
		t.Error("ByUsername(nobody) should miss")
	}

	page, _ := s.List(1, 1)
	if len(page) != 1 || page[0].Username != "Kkameleon" {
		t.Errorf("List(1,1) = %+v", page)
	}
	if page, _ := s.List(10, 5); len(page) != 0 {
		t.Errorf("List past end should be empty, got %+v", page)
	}
}

func TestRefresherKeepsLastGood(t *testing.T) {
	s := NewStore()
	calls := 0
	fetch := func(context.Context) ([]Entry, error) {
		calls++
		if calls == 1 {
			return sample(), nil
		}
		return nil, errors.New("boom")
	}
	r := NewRefresher(s, fetch, time.Hour, nil)

	if err := r.RefreshOnce(context.Background()); err != nil {
		t.Fatalf("first refresh: %v", err)
	}
	if err := r.RefreshOnce(context.Background()); err == nil {
		t.Fatal("second refresh should have failed")
	}
	// Last good snapshot must still be served.
	if s.Len() != 3 {
		t.Errorf("expected last good snapshot of 3, got %d", s.Len())
	}
	ok, fail, lastErr, _ := r.Stats()
	if ok != 1 || fail != 1 || lastErr == nil {
		t.Errorf("stats: ok=%d fail=%d lastErr=%v", ok, fail, lastErr)
	}
}